WndProc函数（窗口消息处理函数）

参考1

//头文件
static LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
HWND m_hwnd;
static CEchoCAM* m_pEcView;

//源文件
CEchoCAM* CEchoCAM::m_pEcView = NULL;

LRESULT CALLBACK CEchoCAM::WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	if (m_pEcView == NULL)
	{
		return DefWindowProc(hwnd, message, wParam, lParam);
	}

	switch (message)
	{
	case WM_CREATE:
		return m_pEcView->OnCreate(wParam, lParam);
	case WM_DESTROY:
		return 0;
	case WM_ERASEBKGND:
		return 1;
	case WM_PAINT:
		return m_pEcView->OnPaint(wParam, lParam);
	case WM_SIZE:
		m_pEcView->OnSize(wParam, lParam);
		break;
	case WM_MOUSEMOVE:
		return m_pEcView->OnMouseMove(wParam, lParam);
	case WM_MOUSEWHEEL:
	case WM_MOUSEHWHEEL:
		return m_pEcView->OnMouseWheel(wParam, lParam);
	case WM_MOUSELEAVE:
		return m_pEcView->OnMouseLeave(wParam, lParam);
	case WM_MOUSEHOVER:
		return m_pEcView->OnMouseHover(wParam, lParam);
	case WM_LBUTTONDBLCLK:
		return m_pEcView->OnLButtonDBClick(wParam, lParam);
	case WM_LBUTTONDOWN:
		return m_pEcView->OnLButtonDown(wParam, lParam);
	case WM_LBUTTONUP:
		return m_pEcView->OnLButtonUp(wParam, lParam);
	case WM_KEYDOWN:
		return m_pEcView->OnKeyDown(wParam, lParam);
	case WM_KEYUP:
		return m_pEcView->OnKeyUp(wParam, lParam);
	case WM_RBUTTONDOWN:
		return m_pEcView->OnRButtonDown(wParam, lParam);
	case WM_RBUTTONUP:
		return m_pEcView->OnRButtonUp(wParam, lParam);
	case WM_TIMER:
		m_pEcView->OnTimer((UINT)wParam);
		break;
	}
	return ::DefWindowProc(hwnd, message, wParam, lParam);
}

参考2

// 假设有一个名为 hwnd 的窗口句柄

// 在窗口消息处理函数中处理鼠标右键点击事件
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
    switch (uMsg) {
        case WM_RBUTTONDOWN: // 鼠标右键按下事件
            // 创建右键菜单
            HMENU hPopupMenu = CreatePopupMenu();
            AppendMenu(hPopupMenu, MF_STRING, 1, L"修改起刀点"); // 添加菜单项

            // 获取鼠标位置
            POINT pt;
            GetCursorPos(&pt);

            // 显示右键菜单
            TrackPopupMenu(hPopupMenu, TPM_LEFTALIGN | TPM_TOPALIGN, pt.x, pt.y, 0, hwnd, NULL);
            DestroyMenu(hPopupMenu); // 销毁菜单
            break;
        // 其他消息处理
    }
    // 其他消息处理
}

// 在窗口的创建过程中注册窗口类
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    // 窗口类注册等操作

    // 创建窗口
    HWND hwnd = CreateWindowEx(0, L"ClassName", L"Window Title", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 800, 600, NULL, NULL, hInstance, NULL);

    // 显示窗口
    ShowWindow(hwnd, nCmdShow);

    // 消息循环
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return 0;
}