c++ - 我的 Visual C++ Win32 中有一个无法关闭的 MessageBox!到底是怎么回事？

Question

我有一个无法关闭的消息框，我不确定为什么。它是在我的窗口过程中为这样创建的对话框创建的:

hwnd = CreateDialog(GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_DIALOG1), NULL, WndProc);

下面是有问题的 WndProc 代码。问题出在 MessageBox 调用上，OK 按钮没有任何作用，也没有点击该消息框上的“X”。

BOOL CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    static HBRUSH bgBrush;
    switch (msg)
    {
    case WM_INITDIALOG:
        bgBrush = CreateSolidBrush(RGB(65, 65, 66));
        return TRUE;

    case WM_CTLCOLORDLG:
        return (INT_PTR)(bgBrush);

    case WM_CTLCOLORSTATIC:
        SetBkMode((HDC)wParam, TRANSPARENT);
        SetTextColor((HDC)wParam, RGB(200, 200, 200));
        return (INT_PTR)(bgBrush);

    case WM_DEVICECHANGE:
        USBEnumerateDev();
        break;

    case WM_COMMAND:
    {
                       switch (LOWORD(wParam))
                       {
                       case IDC_SELECTPROFILE:
                           switch (HIWORD(wParam))
                           {
                           case BN_CLICKED:
                               int res = CommonFileDialog.BasicFileOpen(hwnd);
                               if (res == TRUE)
                               {
                                   int len = GetWindowTextLength(GetDlgItem(hwnd, IDC_EDITWLAN));
                                   if (len > 0)
                                   {
                                       int i;
                                       wchar_t* buf;

                                       buf = (wchar_t*)GlobalAlloc(GPTR, len + 1);
                                       GetDlgItemText(hwnd, IDC_EDITWLAN, buf, len + 1);



                                       GlobalFree((HANDLE)buf);
                                   }
                               }
                               break;
                           }
                           break;

                       case IDC_PROGRAM:
                           switch (HIWORD(wParam))
                           {
                           case BN_CLICKED:
                               int len = GetWindowTextLength(GetDlgItem(hwnd, IDC_EDITWLAN));
                               if (len > 0)
                               {
                                   int i, fileSize;
                                   LPSTR XMLfilename, buf;
                                   FILE *fXMLfile;

                                   XMLfilename = (LPSTR)GlobalAlloc(GPTR, len + 1);
                                   GetDlgItemTextA(hwnd, IDC_EDITWLAN, XMLfilename, len + 1);
                                   fopen_s(&fXMLfile, XMLfilename, "r");
                                   fseek(fXMLfile, 0L, SEEK_END);
                                   fileSize = ftell(fXMLfile);
                                   fseek(fXMLfile, 0L, SEEK_SET);
                                   buf = (LPSTR)GlobalAlloc(GPTR, fileSize);
                                   fread(buf, 1, fileSize, fXMLfile);
                                   DBG("fileSize: %d", fileSize);
                                   if (USBSetProfile(buf, fileSize))
                                       MessageBox(hwnd, L"Programmed!", L"PC -> USB", MB_OK | MB_ICONINFORMATION);
                                   GlobalFree((HANDLE)XMLfilename);
                                   GlobalFree((HANDLE)buf);
                                   //
                               }
                           }
                           break;
                       }
    }
        break;

    case WM_CLOSE:
        DestroyWindow(hwnd);
        break;

    case WM_DESTROY:
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

什么给了？我试过使用窗口句柄和 NULL 调用 MessageBox，同样的事情。

Answer 1

您的 WndProc() 正在调用 DefWindowProc()，但是 documentation特别指出不要那样做:

Although the dialog box procedure is similar to a window procedure, it must not call the DefWindowProc function to process unwanted messages. Unwanted messages are processed internally by the dialog box window procedure.