我想你想要这样的东西：

  DWORD dwLastError = :: GetLastError（）; 
 TCHAR lpBuffer [256] = _T（？）; 
 if（dwLastError！= 0）//不想看到操作成功完成错误;-) 
 :: FormatMessage（FORMAT_MESSAGE_FROM_SYSTEM，//它是系统错误
 NULL，//不需要格式化的字符串
 dwLastError，//嘿Windows：请解释这个错误！
 MAKELANGID（LANG_NEUTRAL，SUBLANG_DEFAULT）//使用标准语言
 lpBuffer ，//将消息放在这里
 STR_ELEMS（lpBuffer）-1，//存储消息的字节数
 NULL）; 
 

另请参阅： http://msdn.microsoft.com/en-us/library/ms679351（VS.85）.aspx

I need to get the text of an error code that i got from the GetLastError function. I saw a few examples but i want a function that get the code and return the string. Thank's you all

I guess you want something like this:

DWORD   dwLastError = ::GetLastError();
TCHAR   lpBuffer[256] = _T("?");
if(dwLastError != 0)    // Don't want to see a "operation done successfully" error ;-)
    ::FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,                 // It´s a system error
                     NULL,                                      // No string to be formatted needed
                     dwLastError,                               // Hey Windows: Please explain this error!
                     MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT),  // Do it in the standard language
                     lpBuffer,              // Put the message here
                     STR_ELEMS(lpBuffer)-1,                     // Number of bytes to store the message
                     NULL);

Also see: http://msdn.microsoft.com/en-us/library/ms679351(VS.85).aspx