华为IPC 挺坑爹的，只有一个开发指南文档，文档中是C++的代码片断，由于用C#实现，中间出现了一个问题，找了半天才找到原因，调用"IVS_PU_RealPlay"函数返回"an error occurred when invoking the video library function"错误信息，经查是由于PU_REAL_PLAY_INFO_S结构体中
public PU_TIME_S stStartTime;//请求预录、录像开始时间
public PU_TIME_S stEndTime;//请求预录、录像结束时间
没有声明，所以出问题，请大家注意！
以下贴出部份代码
//实时浏览结构体
public struct PU_REAL_PLAY_INFO_S
{
public UInt32 ulChannelId;//通道号
public IntPtr hPlayWnd;//播放窗口的句柄,为NULL表示不播放图象
public PU_STREAM_TYPE_E enStreamType; // 码流类型，0-主码流，1-子码流，2-码流3，3-码流4 等以此类推
public PU_VIDEO_TYPE_E enVideoType;//流类型：视频流、音频流、复合流、录像流
public PU_PROTOCOL_TYPE_E enProtocolType;//传输协议类型，UDP,TCP
public PU_MEDIA_CALLBACK_TYPE_E enMediaCallbackType;//回调类型：0:RTP解密 1:RTP不解密 2:Frame 3:YUV
[MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 16)]
public string szLocalIp;
public bool bKeepLive;//是否保活
public PU_TIME_S stStartTime;//请求预录、录像开始时间
public PU_TIME_S stEndTime;//请求预录、录像结束时间
public PU_MEDIA_CRYPTO_TYPE_E enMediaCryptoType;
[MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 44)]
public string szMediaCrypto;
[MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 32)]
public string szReserved;
}
//时间，时、分、秒，24小时制
public struct PU_TIME_S
{
[MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 5)]
string szYear;
[MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 3)]
string szMonth;
[MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 3)]
string szDay;
[MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 3)]
string szHour;
[MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 3)]
string szMinute;
[MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 3)]
string szSecond;
}
HWPuSDK.PU_REAL_PLAY_INFO_S clientinfo = new HWPuSDK.PU_REAL_PLAY_INFO_S();
clientinfo.ulChannelId = 101;
clientinfo.hPlayWnd = this.RealPlayWnd.Handle;
clientinfo.enProtocolType = HWPuSDK.PU_PROTOCOL_TYPE_E.PU_PROTOCOL_TYPE_TCP;
clientinfo.enStreamType = HWPuSDK.PU_STREAM_TYPE_E.PU_VIDEO_MAIN_STREAM;
clientinfo.enVideoType = HWPuSDK.PU_VIDEO_TYPE_E.PU_VIDEO_TYPE_VIDEO;
clientinfo.enMediaCallbackType = HWPuSDK.PU_MEDIA_CALLBACK_TYPE_E.PU_MEDIA_CALLBACK_TYPE_FRAME;
clientinfo.bKeepLive = true;
HWPuSDK.REALDATACALLBACK RealData = new HWPuSDK.REALDATACALLBACK(RealDataCallBack);
IntPtr pUserData = new IntPtr();
ulRealPlay = ulIsReaply = HWPuSDK.IVS_PU_RealPlay(ulogin, ref clientinfo, null, pUserData);
