使用 DoMessageBox 将 AfxMessageBox 转换为 CTaskDialog

到目前为止我已经编写了这个函数：

int CMFCApplication3App::DoMessageBox(LPCTSTR lpszPrompt, UINT nType, UINT nIDPrompt)
{
    CString strContent = CString(lpszPrompt);
    CString strTitle; strTitle.LoadString(AFX_IDS_APP_TITLE);
    CTaskDialog dlgTaskMessageBox(strContent, _T(""), strTitle);
    int iPixelWidth = (::GetSystemMetrics(SM_CXSCREEN) / 100) * 30;
    int iDialogUnitsWidth = MulDiv(iPixelWidth, 4, LOWORD(GetDialogBaseUnits()));
    dlgTaskMessageBox.SetDialogWidth(iDialogUnitsWidth);

    /*
    if (nType & MB_ICONINFORMATION)
        dlgTaskMessageBox.SetMainIcon(TD_INFORMATION_ICON);
    if (nType & MB_ICONERROR)
        dlgTaskMessageBox.SetMainIcon(TD_ERROR_ICON);
    if (nType & MB_ICONWARNING)
        dlgTaskMessageBox.SetMainIcon(TD_WARNING_ICON);
    if (nType & MB_ICONQUESTION)
    {
        HICON hIcon = LoadIcon(IDI_QUESTION);
        dlgTaskMessageBox.SetMainIcon(hIcon);
    }

    int iButtons = 0;
    if (nType & IDYES)
        iButtons |= TDCBF_YES_BUTTON;
    if (nType & IDNO)
        iButtons |= TDCBF_NO_BUTTON;
    if (nType & IDCANCEL)
        iButtons |= TDCBF_CANCEL_BUTTON;
    if (nType & IDOK)
        iButtons |= TDCBF_OK_BUTTON;
    if (nType & IDRETRY)
        iButtons |= TDCBF_RETRY_BUTTON;
    dlgTaskMessageBox.SetCommonButtons(iButtons);
    */

    if (nType == (MB_YESNOCANCEL | MB_ICONERROR))
    {
        dlgTaskMessageBox.SetCommonButtons(TDCBF_YES_BUTTON | TDCBF_NO_BUTTON | TDCBF_CANCEL_BUTTON);
        dlgTaskMessageBox.SetMainIcon(TD_ERROR_ICON);
    }
    if (nType == (MB_YESNOCANCEL | MB_ICONWARNING))
    {
        dlgTaskMessageBox.SetCommonButtons(TDCBF_YES_BUTTON | TDCBF_NO_BUTTON | TDCBF_CANCEL_BUTTON);
        dlgTaskMessageBox.SetMainIcon(TD_WARNING_ICON);
    }
    if (nType == (MB_YESNOCANCEL | MB_ICONINFORMATION))
    {
        dlgTaskMessageBox.SetCommonButtons(TDCBF_YES_BUTTON | TDCBF_NO_BUTTON | TDCBF_CANCEL_BUTTON);
        dlgTaskMessageBox.SetMainIcon(TD_INFORMATION_ICON);
    }
    /*
    if (nType == (MB_YESNOCANCEL | MB_ICONQUESTION))
    {
        dlgTaskMessageBox.SetCommonButtons(TDCBF_YES_BUTTON | TDCBF_NO_BUTTON | TDCBF_CANCEL_BUTTON);
        HICON hIcon = LoadIcon(IDI_QUESTION);
        dlgTaskMessageBox.SetMainIcon(hIcon);
    }
    */
    return dlgTaskMessageBox.DoModal();
}

我对此有两个问题，很高兴分成两个问题：

1. Using IDI_QUESTION导致应用程序崩溃。
2. 有没有更简单的解码方法nType进入所需的各种按钮和图标？

Using IDI_QUESTION导致应用程序崩溃

那是因为IDI_QUESTION is a 标准图标 https://learn.microsoft.com/en-us/windows/win32/menurc/using-icons并且必须通过传递来加载NULL实例句柄::LoadIcon https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-loadicona，但是MFC的CWinApp::LoadIcon passes AfxGetResourceHandle()反而。下面绕过MFC，直接调用Win32 API。

HICON hIcon = ::LoadIcon(NULL, IDI_QUESTION);

是否有更简单的方法将 nType 解码为所需的各种按钮和图标？

不是很容易，但可以将它们分组以减少重复。

int nCommonButtons = 0;

switch(nType)
{
case MB_YESNOCANCEL:
    nCommonButtons |= TDCBF_CANCEL_BUTTON;
case MB_YESNO:
    nCommonButtons |= TDCBF_YES_BUTTON | TDCBF_NO_BUTTON; 
    break;

case MB_OKCANCELRETRY:
    nCommonButtons |= TDCBF_RETRY_BUTTON;
case MB_OKCANCEL:
    nCommonButtons |= TDCBF_CANCEL_BUTTON;
case MB_OK:
    nCommonButtons |= TDCBF_OK_BUTTON; 
    break;

//... etc
}