Mercurial > cpython-lru_cache-weakref

annotate Modules/_ctypes/ctypes.h @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents 3c9232a684ae
children 1996171cfb96
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #if defined (__SVR4) && defined (__sun)
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2 # include <alloca.h>
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3 #endif
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4
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5 #ifndef MS_WIN32
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6 #define max(a, b) ((a) > (b) ? (a) : (b))
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7 #define min(a, b) ((a) < (b) ? (a) : (b))
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8
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9 #define PARAMFLAG_FIN 0x1
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10 #define PARAMFLAG_FOUT 0x2
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11 #define PARAMFLAG_FLCID 0x4
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12 #endif
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13
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14 typedef struct tagPyCArgObject PyCArgObject;
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15 typedef struct tagCDataObject CDataObject;
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16 typedef PyObject *(* GETFUNC)(void *, Py_ssize_t size);
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17 typedef PyObject *(* SETFUNC)(void *, PyObject *value, Py_ssize_t size);
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18 typedef PyCArgObject *(* PARAMFUNC)(CDataObject *obj);
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19
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20 /* A default buffer in CDataObject, which can be used for small C types. If
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21 this buffer is too small, PyMem_Malloc will be called to create a larger one,
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22 and this one is not used.
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23
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24 Making CDataObject a variable size object would be a better solution, but more
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25 difficult in the presence of PyCFuncPtrObject. Maybe later.
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26 */
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27 union value {
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28 char c[16];
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29 short s;
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30 int i;
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31 long l;
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32 float f;
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33 double d;
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34 #ifdef HAVE_LONG_LONG
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35 PY_LONG_LONG ll;
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36 #endif
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37 long double D;
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38 };
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39
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40 /*
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41 Hm. Are there CDataObject's which do not need the b_objects member? In
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42 this case we probably should introduce b_flags to mark it as present... If
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43 b_objects is not present/unused b_length is unneeded as well.
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44 */
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45
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46 struct tagCDataObject {
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47 PyObject_HEAD
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48 char *b_ptr; /* pointer to memory block */
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49 int b_needsfree; /* need _we_ free the memory? */
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50 CDataObject *b_base; /* pointer to base object or NULL */
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51 Py_ssize_t b_size; /* size of memory block in bytes */
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52 Py_ssize_t b_length; /* number of references we need */
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53 Py_ssize_t b_index; /* index of this object into base's
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54 b_object list */
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55 PyObject *b_objects; /* dictionary of references we need to keep, or Py_None */
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56 union value b_value;
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57 };
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58
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59 typedef struct {
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60 PyObject_VAR_HEAD
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61 ffi_closure *pcl_write; /* the C callable, writeable */
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62 void *pcl_exec; /* the C callable, executable */
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63 ffi_cif cif;
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64 int flags;
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65 PyObject *converters;
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66 PyObject *callable;
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67 PyObject *restype;
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68 SETFUNC setfunc;
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69 ffi_type *ffi_restype;
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70 ffi_type *atypes[1];
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71 } CThunkObject;
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72 extern PyTypeObject PyCThunk_Type;
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73 #define CThunk_CheckExact(v) ((v)->ob_type == &PyCThunk_Type)
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74
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75 typedef struct {
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76 /* First part identical to tagCDataObject */
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77 PyObject_HEAD
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78 char *b_ptr; /* pointer to memory block */
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79 int b_needsfree; /* need _we_ free the memory? */
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80 CDataObject *b_base; /* pointer to base object or NULL */
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81 Py_ssize_t b_size; /* size of memory block in bytes */
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82 Py_ssize_t b_length; /* number of references we need */
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83 Py_ssize_t b_index; /* index of this object into base's
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84 b_object list */
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85 PyObject *b_objects; /* list of references we need to keep */
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86 union value b_value;
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87 /* end of tagCDataObject, additional fields follow */
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88
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89 CThunkObject *thunk;
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90 PyObject *callable;
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91
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92 /* These two fields will override the ones in the type's stgdict if
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93 they are set */
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94 PyObject *converters;
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95 PyObject *argtypes;
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96 PyObject *restype;
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97 PyObject *checker;
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98 PyObject *errcheck;
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99 #ifdef MS_WIN32
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100 int index;
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101 GUID *iid;
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102 #endif
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103 PyObject *paramflags;
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104 } PyCFuncPtrObject;
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105
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106 extern PyTypeObject PyCStgDict_Type;
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107 #define PyCStgDict_CheckExact(v) ((v)->ob_type == &PyCStgDict_Type)
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108 #define PyCStgDict_Check(v) PyObject_TypeCheck(v, &PyCStgDict_Type)
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109
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110 extern int PyCStructUnionType_update_stgdict(PyObject *fields, PyObject *type, int isStruct);
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111 extern int PyType_stginfo(PyTypeObject *self, Py_ssize_t *psize, Py_ssize_t *palign, Py_ssize_t *plength);
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112 extern int PyObject_stginfo(PyObject *self, Py_ssize_t *psize, Py_ssize_t *palign, Py_ssize_t *plength);
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113
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114
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115
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116 extern PyTypeObject PyCData_Type;
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117 #define CDataObject_CheckExact(v) ((v)->ob_type == &PyCData_Type)
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118 #define CDataObject_Check(v) PyObject_TypeCheck(v, &PyCData_Type)
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119
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120 extern PyTypeObject PyCSimpleType_Type;
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121 #define PyCSimpleTypeObject_CheckExact(v) ((v)->ob_type == &PyCSimpleType_Type)
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122 #define PyCSimpleTypeObject_Check(v) PyObject_TypeCheck(v, &PyCSimpleType_Type)
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123
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124 extern PyTypeObject PyCField_Type;
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125 extern struct fielddesc *_ctypes_get_fielddesc(const char *fmt);
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126
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127
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128 extern PyObject *
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129 PyCField_FromDesc(PyObject *desc, Py_ssize_t index,
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130 Py_ssize_t *pfield_size, int bitsize, int *pbitofs,
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131 Py_ssize_t *psize, Py_ssize_t *poffset, Py_ssize_t *palign,
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132 int pack, int is_big_endian);
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133
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134 extern PyObject *PyCData_AtAddress(PyObject *type, void *buf);
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135 extern PyObject *PyCData_FromBytes(PyObject *type, char *data, Py_ssize_t length);
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136
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137 extern PyTypeObject PyCArrayType_Type;
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138 extern PyTypeObject PyCArray_Type;
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139 extern PyTypeObject PyCPointerType_Type;
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140 extern PyTypeObject PyCPointer_Type;
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141 extern PyTypeObject PyCFuncPtr_Type;
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142 extern PyTypeObject PyCFuncPtrType_Type;
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143 extern PyTypeObject PyCStructType_Type;
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144
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145 #define PyCArrayTypeObject_Check(v) PyObject_TypeCheck(v, &PyCArrayType_Type)
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146 #define ArrayObject_Check(v) PyObject_TypeCheck(v, &PyCArray_Type)
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147 #define PointerObject_Check(v) PyObject_TypeCheck(v, &PyCPointer_Type)
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148 #define PyCPointerTypeObject_Check(v) PyObject_TypeCheck(v, &PyCPointerType_Type)
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149 #define PyCFuncPtrObject_Check(v) PyObject_TypeCheck(v, &PyCFuncPtr_Type)
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150 #define PyCFuncPtrTypeObject_Check(v) PyObject_TypeCheck(v, &PyCFuncPtrType_Type)
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151 #define PyCStructTypeObject_Check(v) PyObject_TypeCheck(v, &PyCStructType_Type)
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152
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153 extern PyObject *
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154 PyCArrayType_from_ctype(PyObject *itemtype, Py_ssize_t length);
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155
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156 extern PyMethodDef _ctypes_module_methods[];
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157
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158 extern CThunkObject *_ctypes_alloc_callback(PyObject *callable,
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159 PyObject *converters,
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160 PyObject *restype,
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161 int flags);
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162 /* a table entry describing a predefined ctypes type */
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163 struct fielddesc {
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164 char code;
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165 SETFUNC setfunc;
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166 GETFUNC getfunc;
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167 ffi_type *pffi_type; /* always statically allocated */
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168 SETFUNC setfunc_swapped;
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169 GETFUNC getfunc_swapped;
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170 };
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171
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172 typedef struct {
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173 PyObject_HEAD
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174 Py_ssize_t offset;
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175 Py_ssize_t size;
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176 Py_ssize_t index; /* Index into CDataObject's
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177 object array */
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178 PyObject *proto; /* a type or NULL */
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179 GETFUNC getfunc; /* getter function if proto is NULL */
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180 SETFUNC setfunc; /* setter function if proto is NULL */
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181 int anonymous;
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182 } CFieldObject;
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183
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184 /* A subclass of PyDictObject, used as the instance dictionary of ctypes
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185 metatypes */
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186 typedef struct {
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187 PyDictObject dict; /* first part identical to PyDictObject */
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188 /* The size and align fields are unneeded, they are in ffi_type as well. As
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189 an experiment shows, it's trivial to get rid of them, the only thing to
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190 remember is that in PyCArrayType_new the ffi_type fields must be filled in -
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191 so far it was unneeded because libffi doesn't support arrays at all
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192 (because they are passed as pointers to function calls anyway). But it's
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193 too much risk to change that now, and there are other fields which doen't
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194 belong into this structure anyway. Maybe in ctypes 2.0... (ctypes 2000?)
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195 */
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196 Py_ssize_t size; /* number of bytes */
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197 Py_ssize_t align; /* alignment requirements */
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198 Py_ssize_t length; /* number of fields */
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199 ffi_type ffi_type_pointer;
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200 PyObject *proto; /* Only for Pointer/ArrayObject */
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201 SETFUNC setfunc; /* Only for simple objects */
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202 GETFUNC getfunc; /* Only for simple objects */
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203 PARAMFUNC paramfunc;
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204
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205 /* Following fields only used by PyCFuncPtrType_Type instances */
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206 PyObject *argtypes; /* tuple of CDataObjects */
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207 PyObject *converters; /* tuple([t.from_param for t in argtypes]) */
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208 PyObject *restype; /* CDataObject or NULL */
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209 PyObject *checker;
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210 int flags; /* calling convention and such */
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211
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212 /* pep3118 fields, pointers neeed PyMem_Free */
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213 char *format;
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214 int ndim;
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215 Py_ssize_t *shape;
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216 /* Py_ssize_t *strides; */ /* unused in ctypes */
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217 /* Py_ssize_t *suboffsets; */ /* unused in ctypes */
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218
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219 } StgDictObject;
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220
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221 /****************************************************************
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222 StgDictObject fields
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223
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224 setfunc and getfunc is only set for simple data types, it is copied from the
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225 corresponding fielddesc entry. These are functions to set and get the value
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226 in a memory block.
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227 They should probably by used by other types as well.
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228
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229 proto is only used for Pointer and Array types - it points to the item type
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230 object.
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231
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232 Probably all the magic ctypes methods (like from_param) should have C
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233 callable wrappers in the StgDictObject. For simple data type, for example,
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234 the fielddesc table could have entries for C codec from_param functions or
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235 other methods as well, if a subtype overrides this method in Python at
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236 construction time, or assigns to it later, tp_setattro should update the
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237 StgDictObject function to a generic one.
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238
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239 Currently, PyCFuncPtr types have 'converters' and 'checker' entries in their
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240 type dict. They are only used to cache attributes from other entries, whihc
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241 is wrong.
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242
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243 One use case is the .value attribute that all simple types have. But some
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244 complex structures, like VARIANT, represent a single value also, and should
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245 have this attribute.
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246
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247 Another use case is a _check_retval_ function, which is called when a ctypes
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248 type is used as return type of a function to validate and compute the return
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249 value.
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250
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251 Common ctypes protocol:
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252
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253 - setfunc: store a python value in a memory block
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254 - getfunc: convert data from a memory block into a python value
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255
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256 - checkfunc: validate and convert a return value from a function call
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257 - toparamfunc: convert a python value into a function argument
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258
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259 *****************************************************************/
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260
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261 /* May return NULL, but does not set an exception! */
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262 extern StgDictObject *PyType_stgdict(PyObject *obj);
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263
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264 /* May return NULL, but does not set an exception! */
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265 extern StgDictObject *PyObject_stgdict(PyObject *self);
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266
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267 extern int PyCStgDict_clone(StgDictObject *src, StgDictObject *dst);
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268
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269 typedef int(* PPROC)(void);
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270
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271 PyObject *_ctypes_callproc(PPROC pProc,
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272 PyObject *arguments,
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273 #ifdef MS_WIN32
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274 IUnknown *pIUnk,
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275 GUID *iid,
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276 #endif
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277 int flags,
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278 PyObject *argtypes,
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279 PyObject *restype,
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280 PyObject *checker);
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281
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282
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283 #define FUNCFLAG_STDCALL 0x0
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284 #define FUNCFLAG_CDECL 0x1
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285 #define FUNCFLAG_HRESULT 0x2
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286 #define FUNCFLAG_PYTHONAPI 0x4
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287 #define FUNCFLAG_USE_ERRNO 0x8
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288 #define FUNCFLAG_USE_LASTERROR 0x10
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289
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290 #define TYPEFLAG_ISPOINTER 0x100
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291 #define TYPEFLAG_HASPOINTER 0x200
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292
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293 #define DICTFLAG_FINAL 0x1000
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294
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295 struct tagPyCArgObject {
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296 PyObject_HEAD
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297 ffi_type *pffi_type;
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298 char tag;
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299 union {
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300 char c;
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301 char b;
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302 short h;
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303 int i;
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304 long l;
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305 #ifdef HAVE_LONG_LONG
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306 PY_LONG_LONG q;
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307 #endif
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308 long double D;
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309 double d;
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310 float f;
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311 void *p;
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312 } value;
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313 PyObject *obj;
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314 Py_ssize_t size; /* for the 'V' tag */
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315 };
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316
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317 extern PyTypeObject PyCArg_Type;
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318 #define PyCArg_CheckExact(v) ((v)->ob_type == &PyCArg_Type)
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319 extern PyCArgObject *PyCArgObject_new(void);
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320
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321 extern PyObject *
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322 PyCData_get(PyObject *type, GETFUNC getfunc, PyObject *src,
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323 Py_ssize_t index, Py_ssize_t size, char *ptr);
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324
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325 extern int
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326 PyCData_set(PyObject *dst, PyObject *type, SETFUNC setfunc, PyObject *value,
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327 Py_ssize_t index, Py_ssize_t size, char *ptr);
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328
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329 extern void _ctypes_extend_error(PyObject *exc_class, char *fmt, ...);
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330
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331 struct basespec {
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332 CDataObject *base;
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333 Py_ssize_t index;
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334 char *adr;
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335 };
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336
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337 extern char basespec_string[];
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338
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339 extern ffi_type *_ctypes_get_ffi_type(PyObject *obj);
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340
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341 /* exception classes */
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342 extern PyObject *PyExc_ArgError;
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343
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344 extern char *_ctypes_conversion_encoding;
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345 extern char *_ctypes_conversion_errors;
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346
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347 #if defined(HAVE_WCHAR_H)
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348 # define CTYPES_UNICODE
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349 #endif
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350
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351
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352 extern void _ctypes_free_closure(void *);
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353 extern void *_ctypes_alloc_closure(void);
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354
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355 extern void _ctypes_add_traceback(char *, char *, int);
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356
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357 extern PyObject *PyCData_FromBaseObj(PyObject *type, PyObject *base, Py_ssize_t index, char *adr);
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358 extern char *_ctypes_alloc_format_string(const char *prefix, const char *suffix);
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359
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360 extern int _ctypes_simple_instance(PyObject *obj);
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361
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362 extern PyObject *_ctypes_ptrtype_cache;
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363 PyObject *_ctypes_get_errobj(int **pspace);
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364
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365 #ifdef MS_WIN32
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366 extern PyObject *ComError;
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367 #endif
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368
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369 /*
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370 Local Variables:
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371 compile-command: "python setup.py -q build install --home ~"
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372 End:
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373 */