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w32err.c

#include <windows.h>
#include "w32err.h"

/*
 * Description: the windows32 version of perror()
 *
 * Returns:  a pointer to a static error
 *
 * Notes/Dependencies:  I got this from 
 *      comp.os.ms-windows.programmer.win32
 */
char * 
map_windows32_error_to_string (DWORD ercode) {
/* __declspec (thread) necessary if you will use multiple threads */
__declspec (thread) static char szMessageBuffer[128];
 
      /* Fill message buffer with a default message in 
       * case FormatMessage fails 
       */
    wsprintf (szMessageBuffer, "Error %ld", ercode);

      /*
       *  Special code for winsock error handling.
       */
      if (ercode > WSABASEERR) {
            HMODULE hModule = GetModuleHandle("wsock32");
            if (hModule != NULL) {
                  FormatMessage(FORMAT_MESSAGE_FROM_HMODULE,
                        hModule,
                        ercode,
                        LANG_NEUTRAL,
                        szMessageBuffer,
                        sizeof(szMessageBuffer),
                        NULL);
                  FreeLibrary(hModule);
            } 
      } else {
            /*
             *  Default system message handling
             */
      FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,
                  NULL,
                  ercode,
                  LANG_NEUTRAL,
                  szMessageBuffer,
                  sizeof(szMessageBuffer),
                  NULL);
      }
    return szMessageBuffer;
}
 

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