有現成的API可用嗎? 請問該如何撰寫? 謝謝.

BOOL GetUserName( LPTSTR lpBuffer, // address of name buffer LPDWORD nSize // address of size of name buffer ); Parameters lpBuffer Points to the buffer to receive the null-terminated string containing the user's logon name. If this buffer is not large enough to contain the entire user name, the function fails. nSize Pointer to a DWORD that, on input, specifies the maximum size, in characters, of the buffer specified by the lpBuffer parameter. If this buffer is not large enough to contain the entire user name, the function fails. If the function succeeds, it will place the number of characters copied to the buffer into the DWORD that nSize points to. char username[MAX_COMPUTERNAME_LENGTH 1]; DWORD size = MAX_COMPUTERNAME_LENGTH 1; if(GetUserName(username,&size)) Label1->Caption = username;