VC版的SysErrorMessage

  Delphi很方便将system error code 转为错误信息, C++也可实现 :

bool SysErrorMessage(DWORD errCode, LPWSTR outBuffer, size_t& size) {LPVOID lpvMessageBuffer;DWORD lvSize=FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |FORMAT_MESSAGE_FROM_SYSTEM,NULL, errCode,MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),(LPWSTR)&lpvMessageBuffer, 0, NULL);bool lvRet = memcpy_s(outBuffer, size, lpvMessageBuffer, lvSize*sizeof(WCHAR)) == 0;size = lvSize;LocalFree(lpvMessageBuffer);return true;}

调用:

WCHAR    lvBuffer[256] = L"";

if (SysErrorMessage(5,lvBuffer lvSize)) {
OutputDebugString(lvBuffer);