发现我挺笨的,一直以来碰到错误都是GetLastError获取错误代码,然后再去找资料区查询错在哪里... 速度慢,效率低... 呵呵,这不,看了下windows核心编程,就简单的实现了一个dll, 直接一个函数void ShowErrorInformation()函数显示错误, 把GetLastEror()都省了,多好, 呵呵

下面是ShowErrorInformation.h文件

#ifdef SHOW_ERROR_INFO
#else
#define SHOW_ERROR_INFO extern "C" __declspec(dllimport)
#endif

SHOW_ERROR_INFO void ShowErrorInformation();

然后是:ShowErrorInformation.cpp文件,关键就是FormatMessage函数, 具体参考msdn吧. 代码就不解释了.

#include <windows.h>

#define SHOW_ERROR_INFO extern "C" __declspec(dllexport)

#include "ShowErrorInformation.h"
#include "resource.h"

LRESULT CALLBACK ShowErrorInformationDlg(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam);

void ShowErrorInformation()
{
HINSTANCE hInst;
DWORD lastError;

lastError = GetLastError();

hInst = GetModuleHandle("ShowErrorInformation.dll");

DialogBoxParam(hInst, (LPCTSTR)IDD_ERRINFO, GetActiveWindow(), (DLGPROC)ShowErrorInformationDlg, lastError);

}

LRESULT CALLBACK ShowErrorInformationDlg(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
DWORD lastError = 0;
HLOCAL hlocal = 0;
char ErrValue[8] = {0};
char *localoffset;
char *ErrMsgOffset = NULL;
int mod = 0;
int div = 0;
char * ErrMsgBuffer = NULL;
DWORD ErrMsgSize = 0;
BOOL fOk;

switch(uMsg)
{
case WM_INITDIALOG:
   lastError = (DWORD) lParam;
   wsprintf(ErrValue, TEXT("%08X"), lastError);
   SetDlgItemText(hDlg, IDC_ERRVALUE, ErrValue);

   fOk = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,\
                NULL,lastError, MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), (LPTSTR)&hlocal, 0, NULL);   

   if (hlocal != NULL)
   {

    ErrMsgSize = strlen((char *)hlocal);
    div = ErrMsgSize / 36;
    mod = ErrMsgSize % 36;
   
    if (mod != 0)
    {
     div++;
    }
      ErrMsgSize += div * 2;
    ErrMsgBuffer = (char *)VirtualAlloc(NULL, ErrMsgSize, MEM_COMMIT, PAGE_READWRITE);
    memset(ErrMsgBuffer, 0, ErrMsgSize);
   
    if (ErrMsgBuffer == NULL)
    {
     MessageBox(hDlg, TEXT("Alloc Memory Error"), TEXT("Alloc Memory"), MB_OK);
     EndDialog(hDlg, 0);
     return FALSE;
    }

    //将数据换个格式存储
      localoffset = (char *) hlocal;
    ErrMsgOffset = (char *) ErrMsgBuffer;

    if (div == 1)
    {
     memcpy(ErrMsgOffset, hlocal, strlen((char *)hlocal));
    }
    else
    {
     for (int i = 0; i < div; i++)
     {

//这里是显示回车键, 显示的好看些嘛,呵呵
      memcpy(ErrMsgOffset, localoffset, 36);
      localoffset += 35;
      ErrMsgOffset += 35;
      *(++ErrMsgOffset) = 0x0d;
      *(++ErrMsgOffset) = 0x0a;         
     }
    }
    SetDlgItemText(hDlg, IDC_ERRINFORMATION, ErrMsgBuffer);
   }
   else
   {
    SetDlgItemText(hDlg, IDC_ERRINFORMATION, ErrMsgBuffer);
   }

   break;
case WM_COMMAND:
   switch(wParam)
   {
   case IDCANCEL:
    if (ErrMsgBuffer != NULL)
    {
     VirtualFree((PVOID)ErrMsgBuffer, ErrMsgSize, MEM_DECOMMIT);
    }
    EndDialog(hDlg, wParam);
    break;
   }
   break;

   default:
    break;  
}
return FALSE;
}

然后写了一个简单的exe文件测试了下,感觉挺好,呵呵

以下是text.cpp文件

#include "stdafx.h"
#include <windows.h>
#include "ShowErrorInformation.h"
#pragma comment (lib, "ShowErrorInformation.lib")

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
   // TODO: Place code here.
MessageBox(NULL, TEXT("Hello World"), NULL, MB_OK);
    ShowErrorInformation();
CreateFile(TEXT("aa.txt"), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    ShowErrorInformation();
return 0;
}
ShowErrorInformation.h  ShowErrorInformation.lib  ShowErrorInformation.dll  dllcheck.exe见附件

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