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annotate Python/dynload_win.c @ 48345:cb871f736be0

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merge error: test.test_support is now test.support
author Amaury Forgeot d'Arc <amauryfa@gmail.com>
date Thu, 19 Jun 2008 22:03:50 +0000
parents b833a40098c0
children 0522cfee879a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
11599
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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1
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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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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10
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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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 const struct filedescr _PyImport_DynLoadFiletab[] = {
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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15 #ifdef _DEBUG
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16 {"_d.pyd", "rb", C_EXTENSION},
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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17 #else
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18 {".pyd", "rb", C_EXTENSION},
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19 #endif
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20 {0, 0}
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21 };
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22
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23
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24 /* Case insensitive string compare, to avoid any dependencies on particular
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25 C RTL implementations */
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26
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27 static int strcasecmp (char *string1, char *string2)
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28 {
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29 int first, second;
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30
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31 do {
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32 first = tolower(*string1);
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33 second = tolower(*string2);
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34 string1++;
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35 string2++;
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36 } while (first && first == second);
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37
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38 return (first - second);
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39 }
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41
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42 /* Function to return the name of the "python" DLL that the supplied module
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43 directly imports. Looks through the list of imported modules and
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44 returns the first entry that starts with "python" (case sensitive) and
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45 is followed by nothing but numbers until the separator (period).
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46
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47 Returns a pointer to the import name, or NULL if no matching name was
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48 located.
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49
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50 This function parses through the PE header for the module as loaded in
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51 memory by the system loader. The PE header is accessed as documented by
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52 Microsoft in the MSDN PE and COFF specification (2/99), and handles
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53 both PE32 and PE32+. It only worries about the direct import table and
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54 not the delay load import table since it's unlikely an extension is
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55 going to be delay loading Python (after all, it's already loaded).
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56
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57 If any magic values are not found (e.g., the PE header or optional
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58 header magic), then this function simply returns NULL. */
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59
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60 #define DWORD_AT(mem) (*(DWORD *)(mem))
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61 #define WORD_AT(mem) (*(WORD *)(mem))
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62
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63 static char *GetPythonImport (HINSTANCE hModule)
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64 {
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65 unsigned char *dllbase, *import_data, *import_name;
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66 DWORD pe_offset, opt_offset;
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67 WORD opt_magic;
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68 int num_dict_off, import_off;
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69
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70 /* Safety check input */
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71 if (hModule == NULL) {
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72 return NULL;
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73 }
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74
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75 /* Module instance is also the base load address. First portion of
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76 memory is the MS-DOS loader, which holds the offset to the PE
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77 header (from the load base) at 0x3C */
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78 dllbase = (unsigned char *)hModule;
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79 pe_offset = DWORD_AT(dllbase + 0x3C);
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80
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81 /* The PE signature must be "PE\0\0" */
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82 if (memcmp(dllbase+pe_offset,"PE\0\0",4)) {
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83 return NULL;
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84 }
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85
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86 /* Following the PE signature is the standard COFF header (20
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87 bytes) and then the optional header. The optional header starts
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88 with a magic value of 0x10B for PE32 or 0x20B for PE32+ (PE32+
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89 uses 64-bits for some fields). It might also be 0x107 for a ROM
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90 image, but we don't process that here.
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91
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92 The optional header ends with a data dictionary that directly
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93 points to certain types of data, among them the import entries
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94 (in the second table entry). Based on the header type, we
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95 determine offsets for the data dictionary count and the entry
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96 within the dictionary pointing to the imports. */
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97
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98 opt_offset = pe_offset + 4 + 20;
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99 opt_magic = WORD_AT(dllbase+opt_offset);
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100 if (opt_magic == 0x10B) {
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101 /* PE32 */
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102 num_dict_off = 92;
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103 import_off = 104;
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104 } else if (opt_magic == 0x20B) {
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105 /* PE32+ */
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106 num_dict_off = 108;
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107 import_off = 120;
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108 } else {
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109 /* Unsupported */
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110 return NULL;
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111 }
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112
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113 /* Now if an import table exists, offset to it and walk the list of
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114 imports. The import table is an array (ending when an entry has
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115 empty values) of structures (20 bytes each), which contains (at
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116 offset 12) a relative address (to the module base) at which a
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117 string constant holding the import name is located. */
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118
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119 if (DWORD_AT(dllbase + opt_offset + num_dict_off) >= 2) {
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120 /* We have at least 2 tables - the import table is the second
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121 one. But still it may be that the table size is zero */
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122 if (0 == DWORD_AT(dllbase + opt_offset + import_off + sizeof(DWORD)))
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123 return NULL;
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124 import_data = dllbase + DWORD_AT(dllbase +
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125 opt_offset +
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126 import_off);
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127 while (DWORD_AT(import_data)) {
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128 import_name = dllbase + DWORD_AT(import_data+12);
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129 if (strlen(import_name) >= 6 &&
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130 !strncmp(import_name,"python",6)) {
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131 char *pch;
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132
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133 /* Ensure python prefix is followed only
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134 by numbers to the end of the basename */
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135 pch = import_name + 6;
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136 #ifdef _DEBUG
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137 while (*pch && pch[0] != '_' && pch[1] != 'd' && pch[2] != '.') {
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138 #else
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139 while (*pch && *pch != '.') {
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140 #endif
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141 if (*pch >= '0' && *pch <= '9') {
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142 pch++;
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143 } else {
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144 pch = NULL;
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145 break;
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146 }
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147 }
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148
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149 if (pch) {
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150 /* Found it - return the name */
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151 return import_name;
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152 }
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153 }
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154 import_data += 20;
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155 }
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156 }
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157
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158 return NULL;
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159 }
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160
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161
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162 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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163 const char *pathname, FILE *fp)
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164 {
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165 dl_funcptr p;
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166 char funcname[258], *import_python;
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167
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168 PyOS_snprintf(funcname, sizeof(funcname), "PyInit_%.200s", shortname);
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169
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170 {
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171 HINSTANCE hDLL = NULL;
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172 char pathbuf[260];
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173 LPTSTR dummy;
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174 unsigned int old_mode;
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175 /* We use LoadLibraryEx so Windows looks for dependent DLLs
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176 in directory of pathname first. However, Windows95
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177 can sometimes not work correctly unless the absolute
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178 path is used. If GetFullPathName() fails, the LoadLibrary
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179 will certainly fail too, so use its error code */
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180
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181 /* Don't display a message box when Python can't load a DLL */
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182 old_mode = SetErrorMode(SEM_FAILCRITICALERRORS);
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183
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184 if (GetFullPathName(pathname,
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185 sizeof(pathbuf),
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186 pathbuf,
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187 &dummy))
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188 /* XXX This call doesn't exist in Windows CE */
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189 hDLL = LoadLibraryEx(pathname, NULL,
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190 LOAD_WITH_ALTERED_SEARCH_PATH);
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191
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192 /* restore old error mode settings */
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193 SetErrorMode(old_mode);
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194
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195 if (hDLL==NULL){
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196 PyObject *message;
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197 unsigned int errorCode;
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198
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199 /* Get an error string from Win32 error code */
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200 wchar_t theInfo[256]; /* Pointer to error text
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201 from system */
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202 int theLength; /* Length of error text */
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203
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204 errorCode = GetLastError();
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205
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206 theLength = FormatMessageW(
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207 FORMAT_MESSAGE_FROM_SYSTEM |
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208 FORMAT_MESSAGE_IGNORE_INSERTS, /* flags */
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209 NULL, /* message source */
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210 errorCode, /* the message (error) ID */
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211 MAKELANGID(LANG_NEUTRAL,
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212 SUBLANG_DEFAULT),
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213 /* Default language */
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214 theInfo, /* the buffer */
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215 sizeof(theInfo), /* the buffer size */
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216 NULL); /* no additional format args. */
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217
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218 /* Problem: could not get the error message.
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219 This should not happen if called correctly. */
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220 if (theLength == 0) {
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221 message = PyUnicode_FromFormat(
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222 "DLL load failed with error code %d",
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diff changeset
223 errorCode);
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224 } else {
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225 /* For some reason a \r\n
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parents:
diff changeset
226 is appended to the text */
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227 if (theLength >= 2 &&
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228 theInfo[theLength-2] == '\r' &&
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diff changeset
229 theInfo[theLength-1] == '\n') {
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230 theLength -= 2;
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231 theInfo[theLength] = '\0';
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diff changeset
232 }
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233 message = PyUnicode_FromString(
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diff changeset
234 "DLL load failed: ");
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diff changeset
235
c73210ea61c8 On Windows, when import fails to load a dll module, the message says
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236 PyUnicode_AppendAndDel(&message,
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diff changeset
237 PyUnicode_FromUnicode(
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238 theInfo,
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239 theLength));
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240 }
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241 PyErr_SetObject(PyExc_ImportError, message);
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242 Py_XDECREF(message);
25041
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Fred Drake <fdrake@acm.org>
parents: 24071
diff changeset
243 return NULL;
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244 } else {
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245 char buffer[256];
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246
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247 #ifdef _DEBUG
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248 PyOS_snprintf(buffer, sizeof(buffer), "python%d%d_d.dll",
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249 #else
21077
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Jeremy Hylton <jeremy@alum.mit.edu>
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250 PyOS_snprintf(buffer, sizeof(buffer), "python%d%d.dll",
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b8710e6d8d78 When importing an extension on Windows, the code reads the PE 'import
Thomas Heller <theller@ctypes.org>
parents: 25041
diff changeset
251 #endif
25041
ed0b02672f09 Fix a couple of whitespace consistency nits.
Fred Drake <fdrake@acm.org>
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252 PY_MAJOR_VERSION,PY_MINOR_VERSION);
15027
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Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
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253 import_python = GetPythonImport(hDLL);
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Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
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254
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
255 if (import_python &&
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Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
256 strcasecmp(buffer,import_python)) {
21077
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
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257 PyOS_snprintf(buffer, sizeof(buffer),
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
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258 "Module use of %.150s conflicts "
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
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259 "with this version of Python.",
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
diff changeset
260 import_python);
15027
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Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
261 PyErr_SetString(PyExc_ImportError,buffer);
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Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
262 FreeLibrary(hDLL);
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Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
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263 return NULL;
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Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
264 }
11599
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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265 }
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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266 p = GetProcAddress(hDLL, funcname);
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
267 }
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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268
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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269 return p;
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
270 }