c - Create Window without Registering a WNDCLASS?

Question

Is it absolutely necessary to always build and register a new WNDCLASS(EX) for your application? And then use the lpszClassName for the main window?

Isn't there some prebuilt class name we can use for a main window, like there is "Button" and "Edit" for buttons and text-boxes etc.?

Answer 1

您可以使用对话框资源创建迷你应用程序，使用 CreateDialog() 而不是 CreateWindow()。样板代码可能如下所示，减去所需的错误检查：

#include "stdafx.h"
#include "resource.h"

INT_PTR CALLBACK DlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_INITDIALOG: 
        return (INT_PTR)TRUE;
    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) {
            DestroyWindow(hDlg);
            PostQuitMessage(LOWORD(wParam)-1);
            return (INT_PTR)TRUE;
        }
        break;
    }
    return (INT_PTR)FALSE;
}

int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) {
    HWND hWnd = CreateDialog(hInstance, MAKEINTRESOURCE(IDD_DIALOG1), NULL, DlgProc);
    if (hWnd == NULL) DebugBreak();
    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return (int) msg.wParam;
}

假设您使用 id IDD_DIALOG1 使用资源编辑器创建了一个对话框。

Answer 2

There are no pre-defined window classes for top-level application windows. You must register a window class for your application, or use a dialog.