÷÷请问：如何将GetLastError()返回的错误代码转换成字符串，啊？谢谢！÷÷

[IceWall]

[kimryo]

看MSDN上的FormatMessage函数。

[xiaoxiaohan]

// -----------------------------------------------------------------------------
// File Name : VCTools.h
// Author : Yao Li Jun
// -----------------------------------------------------------------------------

#ifndef __VCTOOLS_H__
#define __VCTOOLS_H__

// -----------------------------------------------------------------------------
// Function List
// GetErrorMessage : Get error message from error code.
// 2001/11/17/
// -----------------------------------------------------------------------------


PTSTR GetErrorMessage( DWORD,
DWORD = MAKELANGID( LANG_NEUTRAL, SUBLANG_DEFAULT ) );

#endif // __VCTOOLS_H__

[xiaoxiaohan]

// -----------------------------------------------------------------------------
// File Name : VCTools.cpp
// Author : Yao Li Jun
// -----------------------------------------------------------------------------

#include "stdafx.h"
#include "VCTools.h"

// -----------------------------------------------------------------------------
// [Function Name]
// GetErrorMessage
// [Outline]
// Get error message from error code.
// The function should search the system message-table resource
// for the requested message.
// [Resume]
// Create 2001/11/17 Yao Li Jun
// [Parameters]
// dwErrCode Win32 error codes
// dwLanguageId The language identifier for the requested message.
// By default,the function use user default language.
// [Return Values]
// If the function succeeds, the return value is pointer to a buffer.
// If the function fails, the return value is NULL.
// [Example Code]
// DWORD dwErrCode = 0;
// LPSTR MessageBuffer = NULL;
//
// dwErrCode = GetLastError( );
// MessageBuffer = GetErrorMessage( dwErrCode );
// if ( MessageBuffer != NULL )
// {
// MessageBox( NULL, MessageBuffer, "Error Message Box", MB_OK );
// }
// LocalFree( MessageBuffer );
// -----------------------------------------------------------------------------
PTSTR GetErrorMessage( DWORD dwErrCode, DWORD dwLanguageId )
{
DWORD dwRet = 0;
PTSTR szResult = NULL;

dwRet = FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
dwErrCode,
dwLanguageId,
( PTSTR )&szResult,
0,
NULL );
if ( dwRet == 0 )
{
szResult = NULL;
}

return szResult;
}

[bluekite]

oh..... i came here late...

[masterz]

void ShowSystemError()
{//Show error message of GetLastError()
LPVOID lpMsgBuf;
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL
);
MessageBox( NULL, (LPCTSTR)lpMsgBuf, "Error", MB_OK | MB_ICONINFORMATION );
LocalFree( lpMsgBuf );
}

[bluekite]

remember :
If you specify FORMAT_MESSAGE_ALLOCATE_BUFFER in the FormatMessage(), then you must free the memory allocated --> LocalFree( MessageBuffer );