C#从picturebox中截取视频拍照并且通过接口发送照片

最新推荐文章于 2024-02-23 14:33:26 发布

Reforn

最新推荐文章于 2024-02-23 14:33:26 发布

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本文介绍如何在WPF应用中利用PictureBox控件实现视频流的实时拍照功能，并通过HTTP接口推送拍摄的照片。文章详细展示了通过P/Invoke调用Win32 API进行屏幕截图的具体步骤，同时给出了通过HTTP响应将图片发送到客户端的方法。

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WPF中使用winform控件picturebox，获取handle调用公司内部接口显示视频。

需求分两步，第一步：实现拍照功能；第二步：给别人提供接口将照片推送到页面中。

第一步实现：

[DllImport("user32.dll")]
public static extern IntPtr GetWindowDC(IntPtr hwnd);
[DllImport("user32.dll")]
public static extern IntPtr GetWindowRect(IntPtr hWnd, ref RECT rect);

[DllImport("gdi32.dll")]
public static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight);

[DllImport("gdi32.dll")]
public static extern IntPtr CreateCompatibleDC(IntPtr hdc);

[DllImport("gdi32.dll")]
public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

[DllImport("user32.dll")]
public static extern bool PrintWindow(IntPtr hwnd, IntPtr hdcBlt, UInt32 nFlags);

[DllImport("gdi32.dll")]
public static extern IntPtr DeleteObject(IntPtr hgdiobj);

[DllImport("gdi32.dll")]
public static extern int DeleteDC(IntPtr hdc);

//对客户视频拍照
public static Bitmap CutControlBitmap(IntPtr winCotPtr)
{
//1先获取控件的大小
IntPtr hscrdc = GetWindowDC(winCotPtr);
RECT rECT = new RECT();
GetWindowRect(winCotPtr, ref rECT);
IntPtr mapPtr = CreateCompatibleBitmap(hscrdc, rECT.Right - rECT.Left, rECT.Bottom - rECT.Top);
IntPtr hmemdc = CreateCompatibleDC(hscrdc);
SelectObject(hmemdc, mapPtr);
PrintWindow(winCotPtr, hmemdc, 0);
Bitmap bmp = Bitmap.FromHbitmap(mapPtr);
DeleteObject(mapPtr);
DeleteDC(hscrdc);
DeleteDC(hmemdc);

//bmp.Save("aabbcc.jpg");

return bmp;
}

public struct RECT
{
public int Left;
public int Top;
public int Right;
public int Bottom;
}

以上内容参考了：https://blog.csdn.net/weixin_43542114/article/details/112918250?utm_medium=distribute.pc_relevant_download.none-task-blog-2~default~BlogCommendFromBaidu~default-3.nonecase&depth_1-utm_source=distribute.pc_relevant_download.none-task-blog-2~default~BlogCommendFromBaidu~default-3.nonecas

第二步：http接口推送照片

多次尝试Response.OutputStream直接发送byte[]都以失败告终。改为以下方式：

Bitmap imgByte = imageHelper.CutControlBitmap(MainWindow.mainWindowsInstance.intPtrDest);

using (hlc.Response.OutputStream)
{
hlc.Response.Headers["Pragma"] = "no-cache";
hlc.Response.Headers["Cache-Control"] = "no-cache";
hlc.Response.ContentType = "image/Jpeg";
imgByte.Save(hlc.Response.OutputStream, ImageFormat.Jpeg);
hlc.Response.OutputStream.Flush();
if (GlobalInfo.logManager != null)
{
GlobalInfo.logManager.Info(callback + "({'ret':'CustomerPhotos'})");
}
}