Windows 核心编程 ErrorShow
/*
由于用原始API编写程序，所以在发送ESM_POKECODEANDLOOKUP 消息时，对话框资源还没有初始化成功
因此除去对ESM_POKECODEANDLOOKUP 消息的初始化处理部分，程序运行成功。
*/
/************************************************************************/
/* Module : ErrorShow.cpp */
/************************************************************************/
#include <Windows.h>
#include <tchar.h>
#include "resource.h"
#define ESM_POKECODEANDLOOKUP (WM_USER + 100)
const TCHAR g_szAppName[] = _TEXT("Error Show");
INT_PTR CALLBACK DialogProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
switch(uMsg)
{
case WM_INITDIALOG:
SendMessage(hwnd,WM_SETICON,ICON_SMALL,(LPARAM)
LoadIcon((HINSTANCE)GetWindowLongPtr(hwnd,GWLP_HINSTANCE),
MAKEINTRESOURCE(IDD_ERRORSHOW)));
// Don't accept error codes more than 5 digits long
SendMessage(GetDlgItem(hwnd,IDC_ERRORCODE),EM_LIMITTEXT,(WPARAM)5,0L);
break;
case WM_COMMAND:
switch( LOWORD(wParam) )
{
case IDCANCEL:
EndDialog(hwnd, uMsg);
break;
case IDC_ALWAYSONTOP:
SetWindowPos(hwnd, IsDlgButtonChecked(hwnd, IDC_ALWAYSONTOP)
? HWND_TOPMOST : HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
break;
case IDC_ERRORCODE:
EnableWindow(GetDlgItem(hwnd, IDOK), GetWindowTextLength(hwnd) > 0);
break;
case IDOK:
// Get the error code
DWORD dwError = GetDlgItemInt(hwnd, IDC_ERRORCODE, NULL, FALSE);
HLOCAL hlocal = NULL; // Buffer that gets the error message string
// Get the error code's textual description
BOOL fOk = FormatMessage(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL),
(PTSTR) &hlocal, 0, NULL);
if (!fOk)
{
// Is it a network-related error?
HMODULE hDll = LoadLibraryEx(TEXT("netmsg.dll"), NULL,
DONT_RESOLVE_DLL_REFERENCES);
if (hDll != NULL)
{
FormatMessage(
FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_FROM_SYSTEM,
hDll, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL),
(PTSTR) &hlocal, 0, NULL);
FreeLibrary(hDll);
}
}
if (hlocal != NULL)
{
SetDlgItemText(hwnd, IDC_ERRORTEXT, (PCTSTR) LocalLock(hlocal));
LocalFree(hlocal);
}
else
{
SetDlgItemText(hwnd, IDC_ERRORTEXT, TEXT("Error number not found."));
}
break;
}
break;
}
return false;
}
//////////////////////////////////////////////////////////////////////////
int WINAPI wWinMain( HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPWSTR lpCmdLine,
int nShowCmd )
{
HWND hwnd = FindWindow(_TEXT("#32770"),_TEXT("Error Show"));
if (IsWindow(hwnd))
{
SendMessage(hwnd,ESM_POKECODEANDLOOKUP,_ttoi(lpCmdLine),0);
}
else
{
DialogBoxParam(hInstance,MAKEINTRESOURCE(IDD_ERRORSHOW),
NULL,DialogProc,_ttoi(lpCmdLine));
}
return 0;
}