有人用過VedioCapture類嗎?就是c#下的視頻採集類,挺好用的,可是我現在發現多線程下似乎無法獲取圖片,
using System;
using System.Runtime.InteropServices;
using System.Threading;
namespace ReboundServer
{
///
/// VedioCapture 的摘要說明。
///
public class VedioCapture
{
private int hCaptureM;
private bool isUnLoad = false;
public VedioCapture ()
{
}
[DllImport("avicap32.dll")]
private static extern int capCreateCaptureWindow(string strWindowName, int dwStyle, int x, int y, int width, int height, int hwdParent, int nID);
[DllImport("user32.dll")]
private static extern int SendMessage(int hwnd, int wMsg, int wParam, int lParam);
[DllImport("user32.dll")]
private static extern int SendMessage(int hwnd, int wMsg, int wParam, string lParam);
[DllImport("Kernel32.dll")]
private static extern bool CloseHandle(int hObject);
public bool Initialize(System.Windows.Forms.Control aContainer, int intWidth, int intHeight)
{
hCaptureM = capCreateCaptureWindow("", 0x40000000 ¦ 0x10000000, 0, 0, intWidth, intHeight, aContainer.Handle.ToInt32(), 1);
if (hCaptureM == 0) return false;
int ret = SendMessage(hCaptureM, 1034, 0, 0);
if (ret == 0)
{
CloseHandle(hCaptureM);
return false;
}
//WM_CAP_SET_PREVIEW
ret = SendMessage(hCaptureM, 1074, 1, 0);
if (ret == 0)
{
this.UnLoad();
return false;
}
//WM_CAP_SET_SCALE
ret = SendMessage(hCaptureM, 1077, 1, 0);
if (ret == 0)
{
this.UnLoad();
return false;
}
//WM_CAP_SET_PREVIEWRATE
ret = SendMessage(hCaptureM, 1076, 66, 0);
if (ret == 0)
{
this.UnLoad();
return false;
}
return true;
}
public void SingleFrameBegin()
{
//
int ret = SendMessage(hCaptureM, 1094, 0, 0);
}
public void SingleFrameEnd()
{
//
int ret = SendMessage(hCaptureM, 1095, 0, 0);
}
public void SingleFrameMode()
{
//WM_CAP_GRAB_FRAME
int ret = SendMessage(hCaptureM, 1084, 0, 0);
//WM_CAP_SET_PREVIEW
//int ret = SendMessage( hCaptureM, 1074 , 0, 0 );
//WM_CAP_SINGLE_FRAME
//ret = SendMessage( hCaptureM, 1096 , 0, 0 );
}
public void PreviewMode()
{
int ret = SendMessage(hCaptureM, 1074, 1, 0);
}
public void UnLoad()
{
int ret = SendMessage(hCaptureM, 1035, 0, 0);
CloseHandle(this.hCaptureM);
isUnLoad = true;
}
public void CopyToClipBorad()
{
int ret = SendMessage(hCaptureM, 1054, 0, 0);
}
public System.Drawing.Image getCaptureImage()
{
System.Windows.Forms.IDataObject iData = System.Windows.Forms.Clipboard.GetDataObject();
System.Drawing.Image retImage = null;
if (iData != null)
{
if (iData.GetDataPresent(System.Windows.Forms.DataFormats.Bitmap))
{
retImage = (System.Drawing.Image)iData.GetData(System.Windows.Forms.DataFormats.Bitmap);
}
else if (iData.GetDataPresent(System.Windows.Forms.DataFormats.Dib))
{
retImage = (System.Drawing.Image)iData.GetData(System.Windows.Forms.DataFormats.Dib);
}
}
return retImage;
}
~AVG()
{
if (!isUnLoad)
{
this.UnLoad();
}
}
}
}
在windows程序中直接調用一切正常,可是我想通過多線程進行截取pictureBox上的圖片時沒有辦法截取到getCaptureImage函數中始終無法得到Clipboard上的數據.