在 C++ 中创建 window

Question

我对 c++ 和其他语言有一些经验，但我在使用 c++ 之前只制作过游戏，我需要制作一个 OBS 插件。我想知道是否有人可以提供帮助..

我正在尝试用 -

创建一个 window

    int nHeight = 500;
int nWidth = 500;

#define metaData(lpClassName, lpWindowName, dwStyle, x, y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam)\
    CreateWindowExA(0L, lpClassName, lpWindowName, dwStyle, x, y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam)

if (GetAsyncKeyState(VK_F5))
    {
        //MsgeBox::myMessage::createMessage(NULL, (LPCWSTR)L"Hello", (LPCWSTR)L"I See You.", MB_ICONWARNING | MB_CANCELTRYCONTINUE);
        #define CreateWindow metaData;
    }

它不会创建 window，也不会给出错误。当我调用消息框时，它只会在我尝试关闭 window 时出现。为什么那个？

如何创建单独的 window？

我接下来的教程是 - https://msdn.microsoft.com/en-us/library/bb384843.aspx

Answer 1

您必须创建一个消息程序然后响应关键消息。例如

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
{
    switch (msg)
    {
    case WM_KEYDOWN:
        if (wp == VK_F5)
        CreateWindow(L"ChildClass", L"Child window", 
                    WS_VISIBLE | WS_POPUPWINDOW | WS_CAPTION, 
                    0, 0, 300, 200, hwnd, 0, 0, 0);
        break;

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProc(hwnd, msg, wp, lp);
}

请注意，您必须为 "ChildClass" 注册第二个 class 名称，然后为此 child class 创建一个不同的消息过程。

然后您添加一个名为 ChildProc 的单独函数，它类似于 WndProc。例如：

#define UNICODE
#include <Windows.h>

HINSTANCE g_hinstance = 0;

LRESULT CALLBACK ChildProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
{
    switch (msg)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProc(hwnd, msg, wp, lp);
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
{
    switch (msg)
    {
    case WM_KEYDOWN:
    {
        if (wp == VK_F5)
        {
            MessageBox(0, L"VK_F5 detected", 0, 0);
            if (!CreateWindow(L"ChildClass", L"ChildTitle",
                WS_VISIBLE | WS_POPUPWINDOW | WS_CAPTION, 100, 100, 300, 200,
                hwnd, 0, g_hinstance, 0))
            {
                DWORD err = GetLastError();
                wchar_t buf[100];
                wsprintf(buf, L"%d\n", err);
                MessageBox(0, buf, 0, 0);
            }
        }
        break;
    }

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProc(hwnd, msg, wp, lp);
}

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, LPTSTR, int)
{
    WNDCLASSEX wcex = { sizeof(WNDCLASSEX) };
    wcex.style = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.hInstance = hInstance;
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
    wcex.lpszClassName = L"MainClass";
    RegisterClassEx(&wcex);

    wcex.lpszClassName = L"ChildClass";
    wcex.lpfnWndProc = ChildProc;
    RegisterClassEx(&wcex);

    CreateWindow(L"MainClass", L"MainTitle", WS_VISIBLE | WS_OVERLAPPEDWINDOW,
        0, 0, 600, 400, 0, 0, hInstance, 0);

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;
}

在 C++ 中创建 window

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visual-studio-2013