Daha sonra kullanmam gerekeceğinden bunu burada bırakacağım. Montaj, C ve C ++ 'da eşit derecede iyi çalışacak küçük bir ikili uyumlu araç için bir kaynaktır.
GetErrorMessageLib.c (GetErrorMessageLib.dll için derlendi)
#include <Windows.h>
/***
* returns 0 if there was enough space, size of buffer in bytes needed
* to fit the result, if there wasn't enough space. -1 on error.
*/
__declspec(dllexport)
int GetErrorMessageA(DWORD dwErrorCode, LPSTR lpResult, DWORD dwBytes)
{
LPSTR tmp;
DWORD result_len;
result_len = FormatMessageA (
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL,
dwErrorCode,
LANG_SYSTEM_DEFAULT,
(LPSTR)&tmp,
0,
NULL
);
if (result_len == 0) {
return -1;
}
// FormatMessage's return is 1 character too short.
++result_len;
strncpy(lpResult, tmp, dwBytes);
lpResult[dwBytes - 1] = 0;
LocalFree((HLOCAL)tmp);
if (result_len <= dwBytes) {
return 0;
} else {
return result_len;
}
}
/***
* returns 0 if there was enough space, size of buffer in bytes needed
* to fit the result, if there wasn't enough space. -1 on error.
*/
__declspec(dllexport)
int GetErrorMessageW(DWORD dwErrorCode, LPWSTR lpResult, DWORD dwBytes)
{
LPWSTR tmp;
DWORD nchars;
DWORD result_bytes;
nchars = dwBytes >> 1;
result_bytes = 2 * FormatMessageW (
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL,
dwErrorCode,
LANG_SYSTEM_DEFAULT,
(LPWSTR)&tmp,
0,
NULL
);
if (result_bytes == 0) {
return -1;
}
// FormatMessage's return is 1 character too short.
result_bytes += 2;
wcsncpy(lpResult, tmp, nchars);
lpResult[nchars - 1] = 0;
LocalFree((HLOCAL)tmp);
if (result_bytes <= dwBytes) {
return 0;
} else {
return result_bytes * 2;
}
}
satır içi sürüm (GetErrorMessage.h):
#ifndef GetErrorMessage_H
#define GetErrorMessage_H
#include <Windows.h>
/***
* returns 0 if there was enough space, size of buffer in bytes needed
* to fit the result, if there wasn't enough space. -1 on error.
*/
static inline int GetErrorMessageA(DWORD dwErrorCode, LPSTR lpResult, DWORD dwBytes)
{
LPSTR tmp;
DWORD result_len;
result_len = FormatMessageA (
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL,
dwErrorCode,
LANG_SYSTEM_DEFAULT,
(LPSTR)&tmp,
0,
NULL
);
if (result_len == 0) {
return -1;
}
// FormatMessage's return is 1 character too short.
++result_len;
strncpy(lpResult, tmp, dwBytes);
lpResult[dwBytes - 1] = 0;
LocalFree((HLOCAL)tmp);
if (result_len <= dwBytes) {
return 0;
} else {
return result_len;
}
}
/***
* returns 0 if there was enough space, size of buffer in bytes needed
* to fit the result, if there wasn't enough space. -1 on error.
*/
static inline int GetErrorMessageW(DWORD dwErrorCode, LPWSTR lpResult, DWORD dwBytes)
{
LPWSTR tmp;
DWORD nchars;
DWORD result_bytes;
nchars = dwBytes >> 1;
result_bytes = 2 * FormatMessageW (
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL,
dwErrorCode,
LANG_SYSTEM_DEFAULT,
(LPWSTR)&tmp,
0,
NULL
);
if (result_bytes == 0) {
return -1;
}
// FormatMessage's return is 1 character too short.
result_bytes += 2;
wcsncpy(lpResult, tmp, nchars);
lpResult[nchars - 1] = 0;
LocalFree((HLOCAL)tmp);
if (result_bytes <= dwBytes) {
return 0;
} else {
return result_bytes * 2;
}
}
#endif /* GetErrorMessage_H */
dinamik kullanım alanı (hata kodunun geçerli olduğu varsayılır, aksi takdirde -1 kontrolü gerekir):
#include <Windows.h>
#include <Winbase.h>
#include <assert.h>
#include <stdio.h>
int main(int argc, char **argv)
{
int (*GetErrorMessageA)(DWORD, LPSTR, DWORD);
int (*GetErrorMessageW)(DWORD, LPWSTR, DWORD);
char result1[260];
wchar_t result2[260];
assert(LoadLibraryA("GetErrorMessageLib.dll"));
GetErrorMessageA = (int (*)(DWORD, LPSTR, DWORD))GetProcAddress (
GetModuleHandle("GetErrorMessageLib.dll"),
"GetErrorMessageA"
);
GetErrorMessageW = (int (*)(DWORD, LPWSTR, DWORD))GetProcAddress (
GetModuleHandle("GetErrorMessageLib.dll"),
"GetErrorMessageW"
);
GetErrorMessageA(33, result1, sizeof(result1));
GetErrorMessageW(33, result2, sizeof(result2));
puts(result1);
_putws(result2);
return 0;
}
düzenli kullanım durumu (hata kodunun geçerli olduğunu varsayar, aksi takdirde -1 dönüş kontrolü gereklidir):
#include <stdio.h>
#include "GetErrorMessage.h"
#include <stdio.h>
int main(int argc, char **argv)
{
char result1[260];
wchar_t result2[260];
GetErrorMessageA(33, result1, sizeof(result1));
puts(result1);
GetErrorMessageW(33, result2, sizeof(result2));
_putws(result2);
return 0;
}
Örneğin, MinGW32'deki gibi montaj gnu ile kullanma (yine, hata kodunun geçerli olduğu varsayılmıştır, aksi takdirde -1 kontrolü gereklidir).
.global _WinMain@16
.section .text
_WinMain@16:
// eax = LoadLibraryA("GetErrorMessageLib.dll")
push $sz0
call _LoadLibraryA@4 // stdcall, no cleanup needed
// eax = GetProcAddress(eax, "GetErrorMessageW")
push $sz1
push %eax
call _GetProcAddress@8 // stdcall, no cleanup needed
// (*eax)(errorCode, szErrorMessage)
push $200
push $szErrorMessage
push errorCode
call *%eax // cdecl, cleanup needed
add $12, %esp
push $szErrorMessage
call __putws // cdecl, cleanup needed
add $4, %esp
ret $16
.section .rodata
sz0: .asciz "GetErrorMessageLib.dll"
sz1: .asciz "GetErrorMessageW"
errorCode: .long 33
.section .data
szErrorMessage: .space 200
sonuç: The process cannot access the file because another process has locked a portion of the file.