上面问题使用win32 API实现

好的，以下是使用 Win32 API 实现创建透明窗口并处理鼠标事件的步骤：

1. 定义窗口类

WNDCLASS wndClass = { 0 };
wndClass.style = CS_HREDRAW | CS_VREDRAW;
wndClass.lpfnWndProc = WndProc;
wndClass.hInstance = hInstance;
wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndClass.hbrBackground = (HBRUSH)GetStockObject(NULL_BRUSH);
wndClass.lpszClassName = L"MyTransparentWindowClass";
RegisterClass(&wndClass);

2. 创建窗口

HWND hWnd = CreateWindowEx(
    WS_EX_LAYERED | WS_EX_TOPMOST | WS_EX_TRANSPARENT,
    L"MyTransparentWindowClass",
    L"My Transparent Window",
    WS_POPUP,
    100, 100, 400, 300,
    NULL, NULL, hInstance, NULL);

3. 设置窗口透明

SetLayeredWindowAttributes(hWnd, RGB(255, 255, 255), 0, LWA_COLORKEY);

4. 处理鼠标事件

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_LBUTTONDOWN:
        int xPos = GET_X_LPARAM(lParam);
        int yPos = GET_Y_LPARAM(lParam);
        wchar_t buffer[100];
        swprintf_s(buffer, L"Mouse down at (%d, %d)", xPos, yPos);
        MessageBox(hWnd, buffer, L"Mouse Event", MB_OK);
        break;

    case WM_DESTROY:
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }

    return 0;
}

5. 显示窗口

ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);

6. 进入消息循环

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

完整的代码示例：

#include <Windows.h>

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 定义窗口类
    WNDCLASS wndClass = { 0 };
    wndClass.style = CS_HREDRAW | CS_VREDRAW;
    wndClass.lpfnWndProc = WndProc;
    wndClass.hInstance = hInstance;
    wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndClass.hbrBackground = (HBRUSH)GetStockObject(NULL_BRUSH);
    wndClass.lpszClassName = L"MyTransparentWindowClass";
    RegisterClass(&wndClass);

    // 创建窗口
    HWND hWnd = CreateWindowEx(
        WS_EX_LAYERED | WS_EX_TOPMOST | WS_EX_TRANSPARENT,
        L"MyTransparentWindowClass",
        L"My Transparent Window",
        WS_POPUP,
        100, 100, 400, 300,
        NULL, NULL, hInstance, NULL);

    // 设置窗口透明
    SetLayeredWindowAttributes(hWnd, RGB(255, 255, 255), 0, LWA_COLORKEY);

    // 显示窗口
    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

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

    return (int)msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_LBUTTONDOWN:
        int xPos = GET_X_LPARAM(lParam);
        int yPos = GET_Y_LPARAM(lParam);
        wchar_t buffer[100];
        swprintf_s(buffer, L"Mouse down at (%d, %d)", xPos, yPos);
        MessageBox(hWnd, buffer, L"Mouse Event", MB_OK);
        break;

    case WM_DESTROY:
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }

    return 0;
}

注意事项：

1. 使用 WS_EX_TRANSPARENT 样式可以让窗口透明，并且不会阻止鼠标消息的传递。
2. 使用 SetLayeredWindowAttributes 函数设置窗口的透明属性，其中第二个参数为透明色，可以设置为 RGB(255, 255, 255) 表示白色，因为白色是系统默认的透明色。