C++ DLL方法(参数) 转化为C# 示例

最新推荐文章于 2022-09-20 09:14:33 发布

阿姆斯特狸

最新推荐文章于 2022-09-20 09:14:33 发布

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分类专栏： c#

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本文介绍如何使用C#实现摄像头的添加与瞬间抓图功能，详细解析了ITE_AddCamera与ITE_SnapPicture两个关键函数的使用方法，并展示了图片处理流程。

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c++:

ITE_HANDLE ITE_AddCamera(IPNC_Info &pInfo,PFSnapPic pfCallback,DWORD dwWait, void *pContext = NULL);

c#:

[DllImport("IPNCNetSDK11.dll", EntryPoint = "ITE_AddCamera_IP")]
public static extern int ITE_AddCameraIP(string szIP, PFSnapPic pfCallback, int dwWait, IntPtr pContext);

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void PFSnapPic(IntPtr pBuff, int nLen, ref IPNC_SnapPicInfo pSnapPicInfo, IntPtr pContext);

返回的结构体解析必须按照顺序，但不必所有的都得写。

handle = util.AddCameraIP(strip, SnapPic, 1000, IntPtr.Zero);
if (handle == -1)
{
MessageBox.Show("添加相机失败");
return;
}
else
{
MessageBox.Show("添加相机成功");
}

void SnapPic(IntPtr pBuff, int nLen, ref IPNC_SnapPicInfo pSnapPicInfo, IntPtr pContext)
{
byte[] p = new byte[nLen];
System.Runtime.InteropServices.Marshal.Copy(pBuff, p, 0, nLen);

string path;
path = "D:\\snap" + pSnapPicInfo.SnapTime.wYear.ToString() + pSnapPicInfo.SnapTime.wMonth.ToString()
+ pSnapPicInfo.SnapTime.wDay.ToString() + pSnapPicInfo.SnapTime.wHour.ToString()
+ pSnapPicInfo.SnapTime.wMinute.ToString() + pSnapPicInfo.SnapTime.wSecond.ToString()
+ pSnapPicInfo.SnapTime.wMilliseconds.ToString() + ".jpg";

FileStream fs = new FileStream(path, FileMode.Create);
fs.Write(p, 0, nLen);
fs.Flush();
fs.Close();
MessageBox.Show("抓拍到一张图片保存在D盘");

return;
}

public struct IPNC_SnapPicInfo
{
public int hCamera;

public ESnapType SnapType;

public SYSTEMTIME SnapTime;

public int RedLampTime;

public int SnapIndex;

[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]
public string Suffix;

public int TriIndex;

public int DriveWay;

public int nSpeed;

public int nSpeedMax;

public int nCoilTime;

public int nCoilDis;

[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
public string cCarMum;

public int nWorkMode;

public int nTD1;

public int nTD2;

public int nBrightAVG;

public SYSTEMTIME Red_Time;

[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 8)]
public string szColor;

public int nReliability;

public int nSnapIndex;

[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]
public string szReverve;

public int picFlag;

[MarshalAs(UnmanagedType.ByValArray, SizeConst = 7)]
public int[] nRev;
}