c++ 根据图片生成异形窗口并在生成的窗口上画图

要生成异形窗口并在窗口上绘制图片，可以使用以下步骤：

1. 加载图片，可以使用GDI+库或其他图片处理库。
2. 创建一个透明的窗口，可以使用Windows API的CreateWindowEx函数，并设置窗口的样式为WS_EX_LAYERED。
3. 使用Windows API的UpdateLayeredWindow函数将图片绘制到窗口上。

下面是一个简单的示例代码，可以根据名为"image.bmp"的图片生成异形窗口并在窗口上绘制图片：

#include <Windows.h>
#include <gdiplus.h>
#pragma comment(lib, "gdiplus.lib")

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hWnd, &ps);

            // 加载图片
            Gdiplus::Bitmap* bmp = Gdiplus::Bitmap::FromFile(L"image.bmp");
            if (bmp != NULL)
            {
                // 绘制图片
                Gdiplus::Graphics graphics(hdc);
                graphics.DrawImage(bmp, 0, 0);
                delete bmp;
            }

            EndPaint(hWnd, &ps);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 加载图片
    Gdiplus::Bitmap* bmp = Gdiplus::Bitmap::FromFile(L"image.bmp");
    if (bmp == NULL)
        return 0;

    // 获取图片的大小
    int width = bmp->GetWidth();
    int height = bmp->GetHeight();

    // 创建透明窗口
    HWND hWnd = CreateWindowEx(WS_EX_LAYERED | WS_EX_TRANSPARENT | WS_EX_TOOLWINDOW, L"MyWindowClass", L"Window Title", WS_POPUP,
        0, 0, width, height, NULL, NULL, hInstance, NULL);
    if (hWnd == NULL)
        return 0;

    // 设置窗口的透明度
    SetLayeredWindowAttributes(hWnd, RGB(0, 0, 0), 0, LWA_COLORKEY);

    // 使用UpdateLayeredWindow函数将图片绘制到窗口上
    HDC hdcScreen = GetDC(NULL);
    HDC hdcMem = CreateCompatibleDC(hdcScreen);
    HBITMAP hBitmap = CreateBitmap(width, height, 1, 32, bmp->GetBits());
    HBITMAP hOldBitmap = (HBITMAP)SelectObject(hdcMem, hBitmap);
    POINT ptDst = { 0, 0 };
    SIZE sz = { width, height };
    POINT ptSrc = { 0, 0 };
    BLENDFUNCTION blend = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
    UpdateLayeredWindow(hWnd, hdcScreen, &ptDst, &sz, hdcMem, &ptSrc, 0, &blend, ULW_ALPHA);
    SelectObject(hdcMem, hOldBitmap);
    DeleteObject(hBitmap);
    DeleteDC(hdcMem);
    ReleaseDC(NULL, hdcScreen);

    // 注册窗口类
    WNDCLASS wc = { 0 };
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszClassName = L"MyWindowClass";
    RegisterClass(&wc);

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

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

    return (int)msg.wParam;
}