Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_win.c @ 71160:bbbeddafeec0

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no one passes NULL here (or should anyway)
author Benjamin Peterson <benjamin@python.org>
date Sun, 03 Jul 2011 17:06:32 -0500
parents f8aacfd3b070
children 8d29cdf28216
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Support for dynamic loading of extension modules */
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3
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4 #include "Python.h"
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5
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6 #ifdef HAVE_DIRECT_H
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7 #include <direct.h>
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8 #endif
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9 #include <ctype.h>
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11 #include "importdl.h"
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12 #include <windows.h>
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13
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14 // "activation context" magic - see dl_nt.c...
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15 extern ULONG_PTR _Py_ActivateActCtx();
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16 void _Py_DeactivateActCtx(ULONG_PTR cookie);
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18 const struct filedescr _PyImport_DynLoadFiletab[] = {
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19 #ifdef _DEBUG
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20 {"_d.pyd", "rb", C_EXTENSION},
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21 #else
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22 {".pyd", "rb", C_EXTENSION},
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23 #endif
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24 {0, 0}
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25 };
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27
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28 /* Case insensitive string compare, to avoid any dependencies on particular
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29 C RTL implementations */
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30
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31 static int strcasecmp (char *string1, char *string2)
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32 {
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33 int first, second;
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34
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35 do {
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36 first = tolower(*string1);
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37 second = tolower(*string2);
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38 string1++;
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39 string2++;
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40 } while (first && first == second);
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41
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42 return (first - second);
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43 }
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45
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46 /* Function to return the name of the "python" DLL that the supplied module
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47 directly imports. Looks through the list of imported modules and
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48 returns the first entry that starts with "python" (case sensitive) and
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49 is followed by nothing but numbers until the separator (period).
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51 Returns a pointer to the import name, or NULL if no matching name was
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52 located.
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53
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54 This function parses through the PE header for the module as loaded in
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55 memory by the system loader. The PE header is accessed as documented by
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56 Microsoft in the MSDN PE and COFF specification (2/99), and handles
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57 both PE32 and PE32+. It only worries about the direct import table and
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58 not the delay load import table since it's unlikely an extension is
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59 going to be delay loading Python (after all, it's already loaded).
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61 If any magic values are not found (e.g., the PE header or optional
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62 header magic), then this function simply returns NULL. */
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63
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64 #define DWORD_AT(mem) (*(DWORD *)(mem))
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65 #define WORD_AT(mem) (*(WORD *)(mem))
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66
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67 static char *GetPythonImport (HINSTANCE hModule)
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68 {
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69 unsigned char *dllbase, *import_data, *import_name;
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70 DWORD pe_offset, opt_offset;
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71 WORD opt_magic;
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72 int num_dict_off, import_off;
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73
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74 /* Safety check input */
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75 if (hModule == NULL) {
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76 return NULL;
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77 }
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78
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79 /* Module instance is also the base load address. First portion of
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80 memory is the MS-DOS loader, which holds the offset to the PE
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81 header (from the load base) at 0x3C */
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82 dllbase = (unsigned char *)hModule;
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83 pe_offset = DWORD_AT(dllbase + 0x3C);
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84
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85 /* The PE signature must be "PE\0\0" */
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86 if (memcmp(dllbase+pe_offset,"PE\0\0",4)) {
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87 return NULL;
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88 }
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89
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90 /* Following the PE signature is the standard COFF header (20
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91 bytes) and then the optional header. The optional header starts
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92 with a magic value of 0x10B for PE32 or 0x20B for PE32+ (PE32+
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93 uses 64-bits for some fields). It might also be 0x107 for a ROM
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94 image, but we don't process that here.
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95
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96 The optional header ends with a data dictionary that directly
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97 points to certain types of data, among them the import entries
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98 (in the second table entry). Based on the header type, we
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99 determine offsets for the data dictionary count and the entry
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100 within the dictionary pointing to the imports. */
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101
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102 opt_offset = pe_offset + 4 + 20;
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103 opt_magic = WORD_AT(dllbase+opt_offset);
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104 if (opt_magic == 0x10B) {
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105 /* PE32 */
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106 num_dict_off = 92;
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107 import_off = 104;
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108 } else if (opt_magic == 0x20B) {
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109 /* PE32+ */
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110 num_dict_off = 108;
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111 import_off = 120;
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112 } else {
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113 /* Unsupported */
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114 return NULL;
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115 }
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116
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117 /* Now if an import table exists, offset to it and walk the list of
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118 imports. The import table is an array (ending when an entry has
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119 empty values) of structures (20 bytes each), which contains (at
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120 offset 12) a relative address (to the module base) at which a
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121 string constant holding the import name is located. */
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122
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123 if (DWORD_AT(dllbase + opt_offset + num_dict_off) >= 2) {
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124 /* We have at least 2 tables - the import table is the second
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125 one. But still it may be that the table size is zero */
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126 if (0 == DWORD_AT(dllbase + opt_offset + import_off + sizeof(DWORD)))
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127 return NULL;
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128 import_data = dllbase + DWORD_AT(dllbase +
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129 opt_offset +
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130 import_off);
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131 while (DWORD_AT(import_data)) {
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132 import_name = dllbase + DWORD_AT(import_data+12);
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133 if (strlen(import_name) >= 6 &&
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134 !strncmp(import_name,"python",6)) {
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135 char *pch;
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136
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137 #ifndef _DEBUG
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138 /* In a release version, don't claim that python3.dll is
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139 a Python DLL. */
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140 if (strcmp(import_name, "python3.dll") == 0) {
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141 import_data += 20;
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142 continue;
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143 }
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144 #endif
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145
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146 /* Ensure python prefix is followed only
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147 by numbers to the end of the basename */
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148 pch = import_name + 6;
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149 #ifdef _DEBUG
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150 while (*pch && pch[0] != '_' && pch[1] != 'd' && pch[2] != '.') {
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151 #else
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152 while (*pch && *pch != '.') {
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153 #endif
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154 if (*pch >= '0' && *pch <= '9') {
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155 pch++;
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156 } else {
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157 pch = NULL;
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158 break;
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159 }
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160 }
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161
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162 if (pch) {
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163 /* Found it - return the name */
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164 return import_name;
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165 }
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166 }
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167 import_data += 20;
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168 }
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169 }
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170
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171 return NULL;
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172 }
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173
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174 dl_funcptr _PyImport_GetDynLoadWindows(const char *shortname,
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175 PyObject *pathname, FILE *fp)
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176 {
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177 dl_funcptr p;
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178 char funcname[258], *import_python;
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179
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180 #ifndef _DEBUG
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181 _Py_CheckPython3();
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182 #endif
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183
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184 PyOS_snprintf(funcname, sizeof(funcname), "PyInit_%.200s", shortname);
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185
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186 {
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187 HINSTANCE hDLL = NULL;
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188 unsigned int old_mode;
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189 ULONG_PTR cookie = 0;
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190
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191 /* Don't display a message box when Python can't load a DLL */
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192 old_mode = SetErrorMode(SEM_FAILCRITICALERRORS);
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193
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194 cookie = _Py_ActivateActCtx();
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195 /* We use LoadLibraryEx so Windows looks for dependent DLLs
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196 in directory of pathname first. */
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197 /* XXX This call doesn't exist in Windows CE */
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198 hDLL = LoadLibraryExW(PyUnicode_AS_UNICODE(pathname), NULL,
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199 LOAD_WITH_ALTERED_SEARCH_PATH);
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200 _Py_DeactivateActCtx(cookie);
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201
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202 /* restore old error mode settings */
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203 SetErrorMode(old_mode);
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204
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205 if (hDLL==NULL){
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206 PyObject *message;
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207 unsigned int errorCode;
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208
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209 /* Get an error string from Win32 error code */
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210 wchar_t theInfo[256]; /* Pointer to error text
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211 from system */
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212 int theLength; /* Length of error text */
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213
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214 errorCode = GetLastError();
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215
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216 theLength = FormatMessageW(
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217 FORMAT_MESSAGE_FROM_SYSTEM |
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218 FORMAT_MESSAGE_IGNORE_INSERTS, /* flags */
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219 NULL, /* message source */
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220 errorCode, /* the message (error) ID */
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221 MAKELANGID(LANG_NEUTRAL,
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222 SUBLANG_DEFAULT),
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223 /* Default language */
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224 theInfo, /* the buffer */
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225 sizeof(theInfo), /* the buffer size */
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226 NULL); /* no additional format args. */
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227
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228 /* Problem: could not get the error message.
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229 This should not happen if called correctly. */
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230 if (theLength == 0) {
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231 message = PyUnicode_FromFormat(
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232 "DLL load failed with error code %d",
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233 errorCode);
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234 } else {
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235 /* For some reason a \r\n
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236 is appended to the text */
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237 if (theLength >= 2 &&
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238 theInfo[theLength-2] == '\r' &&
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239 theInfo[theLength-1] == '\n') {
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240 theLength -= 2;
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241 theInfo[theLength] = '\0';
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242 }
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243 message = PyUnicode_FromString(
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244 "DLL load failed: ");
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245
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246 PyUnicode_AppendAndDel(&message,
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247 PyUnicode_FromUnicode(
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248 theInfo,
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249 theLength));
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250 }
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251 PyErr_SetObject(PyExc_ImportError, message);
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252 Py_XDECREF(message);
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253 return NULL;
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254 } else {
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255 char buffer[256];
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256
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258 #ifdef _DEBUG
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259 "python%d%d_d.dll",
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260 #else
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261 "python%d%d.dll",
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262 #endif
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263 PY_MAJOR_VERSION,PY_MINOR_VERSION);
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264 import_python = GetPythonImport(hDLL);
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265
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266 if (import_python &&
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267 strcasecmp(buffer,import_python)) {
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268 PyErr_Format(PyExc_ImportError,
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269 "Module use of %.150s conflicts "
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270 "with this version of Python.",
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271 import_python);
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272 FreeLibrary(hDLL);
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273 return NULL;
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274 }
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275 }
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276 p = GetProcAddress(hDLL, funcname);
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277 }
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278
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279 return p;
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280 }