您可以通过以下方式使用线程本地 CBT 挂钩SetWindowsHookEx()
定制MessageBox()
您想要的任何对话框。
例如,您可以将“确定”按钮的文本更改为“取消”,例如:
HHOOK hHook = NULL;
LRESULT CALLBACK CBTHookProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode < 0)
return CallNextHookEx(hHook, nCode, wParam, lParam);
if (nCode == HCBT_ACTIVATE)
{
HWND hWnd = reinterpret_cast<HWND>(wParam);
SetWindowText(GetDlgItem(hWnd, IDOK), TEXT("Cancel"));
return 0;
}
return CallNextHookEx(hHook, nCode, wParam, lParam);
}
{
...
hHook = SetWindowsHookEx(WH_CBT, reinterpret_cast<HOOKPROC>(&CBTHookProc), NULL, GetCurrentThreadId());
int iResult = MessageBox(..., MB_OK);
if (iResult == IDOK) iResult = IDCANCEL;
UnhookWindowsHookEx(hHook);
...
}
或者您可以隐藏标准的“确定”按钮,并让对话框仍然使用其本机“取消”按钮:
HHOOK hHook = NULL;
LRESULT CALLBACK CBTHookProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode < 0)
return CallNextHookEx(hHook, nCode, wParam, lParam);
if (nCode == HCBT_ACTIVATE)
{
HWND hWnd = reinterpret_cast<HWND>(wParam);
ShowWindow(GetDlgItem(hWnd, IDOK), SW_HIDE);
// optionally reposition the IDCANCEL child window as well....
return 0;
}
return CallNextHookEx(hHook, nCode, wParam, lParam);
}
{
...
hHook = SetWindowsHookEx(WH_CBT, reinterpret_cast<HOOKPROC>(&CBTHookProc), NULL, GetCurrentThreadId());
int iResult = MessageBox(..., MB_OKCANCEL);
UnhookWindowsHookEx(hHook);
...
}
Update:在 Vista 及更高版本上,您可以(并且应该)使用TaskDialog() http://msdn.microsoft.com/en-us/library/windows/desktop/bb760540.aspx or TaskDialogIndirect() http://msdn.microsoft.com/en-us/library/windows/desktop/bb760544.aspx代替MessageBox()
。任务对话框更加灵活,包括允许您指定对话框上的按钮,甚至使用自定义按钮的能力。因此,您可以轻松显示仅取消对话框,而无需使用任何挂钩,例如:
TaskDialog(..., TDCBF_CANCEL_BUTTON, ..., &iResult);
TASKDIALOGCONFIG TaskConfig = {0};
TaskConfig.cbSize = sizeof(TaskConfig);
TaskConfig.dwCommonButtons = TDCBF_CANCEL_BUTTON;
...
TaskDialogIndirect(&TaskConfig, &iResult, ...);