win32是Graphic::FromImage实现摄像头操作的代码-Go服务器开发

以下是使用Win32 API中的Graphic::FromImage来实现摄像头操作的代码示例：

#include <windows.h>
#include <gdiplus.h>
using namespace Gdiplus;

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 初始化GDI+
    GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR gdiplusToken;
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

    // 创建窗口
    HWND hwnd;
    WNDCLASS wc = {0};
    
    wc.lpfnWndProc = WindowProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = L"CameraWindowClass";
    
    RegisterClass(&wc);
    
    hwnd = CreateWindowEx(
        0,
        L"CameraWindowClass",
        L"Camera Window",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        800,
        600,
        NULL,
        NULL,
        hInstance,
        NULL
     );
     
     if (hwnd == NULL)
         return 0;

     ShowWindow(hwnd, nCmdShow);
     
     MSG msg;
     
     while (GetMessage(&msg, NULL, 0 ,0))
     {
         TranslateMessage(&msg);
         DispatchMessage(&msg);
     }
     
     // 清理GDI+
     GdiplusShutdown(gdiplusToken);
     
     return msg.wParam;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
   switch (uMsg)
   {
       case WM_PAINT:
       {
           PAINTSTRUCT ps;
           HDC hdc = BeginPaint(hwnd, &ps);
           
           // 创建GDI+ Graphics对象
           Graphics graphics(hdc);
           
           // 获取摄像头图像并显示在窗口上
           HBITMAP hBitmap = GetCameraImage(); // 获取摄像头图像的函数，需要自行实现
           
           if (hBitmap != NULL)
           {
               Bitmap bitmap(hBitmap, NULL);
               graphics.DrawImage(&bitmap, 0, 0);
               
               DeleteObject(hBitmap);
           }
           
           EndPaint(hwnd, &ps);
       }
       return 0;
       
       case WM_CLOSE:
            DestroyWindow(hwnd);
            return 0;
            
       case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
   }
   
   return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

请注意，以上代码仅是示例，并没有完整的实现获取摄像头图像的函数。您需要根据具体情况实现GetCameraImage()函数来获取摄像头图像，并将其绘制到窗口中。同时，确保正确链接和引用GDI+库（gdiplus.lib）以及包含相应的头文件（gdiplus.h）。

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