// ------------------------------------------------------------------------------------------
// 从已经打开的序列文件中读出一个帧的数据
// ------------------------------------------------------------------------------------------
public bool ReadRawFrameDataFromFile(ref ggFrame_struct FrameInfoBuff, ref byte[] FrameRawBuff, ref byte[] FrameImageBuff, ref string sErrString)
{
uint dwlen, dwsize, dwcpsize;
byte[] Datatmp;
IntPtr buffer = Marshal.AllocHGlobal(1);
bool bResult = false;
try
{
dwlen = ggData.m_ggheader.cbsize_frame;
Datatmp = br.ReadBytes((int)dwlen);
if (Datatmp.Length == dwlen)
{
dwcpsize = (uint)Datatmp.Length;
dwcpsize = dwcpsize < dwlen ? dwcpsize : dwlen;
//lpdata->m_lpframeinfo = (LPRAWFRAME_INFO)lpdata->m_lpframedata;
//CopyMemory(lpframeinfo, lpdata->m_lpframedata, sizeof(RAWFRAME_INFO));
int size = Marshal.SizeOf(typeof(ggFrame_struct));
Marshal.FreeHGlobal(buffer); // 释放以前分配的空间
buffer = Marshal.AllocHGlobal(size); // 重新分配
Marshal.Copy(Datatmp, 0, buffer, size);
FrameInfoBuff = (ggFrame_struct)Marshal.PtrToStructure(buffer, typeof(ggFrame_struct));
if (FrameInfoBuff.cb_size >= size)
{
FrameRawBuff = new byte[FrameInfoBuff.rawdatasize];
Array.Copy(Datatmp, FrameInfoBuff.rawdataoffset, FrameRawBuff, 0, FrameInfoBuff.rawdatasize);
//FrameImageBuff = new byte[FrameInfoBuff.videoimagesize];
//Array.Copy(Datatmp, FrameInfoBuff.imageoffset, FrameImageBuff, 0, FrameInfoBuff.videoimagesize);
}
else
{
FrameImageBuff = null;
}
sErrString = "成功";
bResult = true;
}
else
{
sErrString = "数据帧长度错误";
bResult = false;
}
}
catch (Exception ex)
{
sErrString = "读帧数据错误（" + ex.Message + "）";
bResult = false;
}
finally
{
Marshal.FreeHGlobal(buffer);
}
return(bResult);
}
public bool ReadFramDataFromMemo(int iFrameID, ref ggFrame_struct FrameInfoBuff, ref byte[] FrameRawBuff, ref byte[] FrameImageBuff, ref string sErrString)
{
bool bResult = false;
IntPtr buffer = Marshal.AllocHGlobal(1);
if (ggData.m_szFileName == "") // 还没关联gg文件
{
sErrString = "尚未打开相关文件。";
return(bResult);
}
if (ggData.numberof_frames <= 0)
{
FrameInfoBuff = new ggFrame_struct(); // 没有数据
FrameRawBuff = null;
return(bResult);
}
try
{
int size = Marshal.SizeOf(typeof(ggFrame_struct));
Marshal.FreeHGlobal(buffer); // 释放以前分配的空间
buffer = Marshal.AllocHGlobal(size); // 重新分配
Marshal.Copy(ggAllFrameInfo, iFrameID * size, buffer, size);
FrameInfoBuff = (ggFrame_struct)Marshal.PtrToStructure(buffer, typeof(ggFrame_struct));
Array.Copy(ggAllRawData, iFrameID * ggData.m_sizeofrawdata, FrameRawBuff, 0, ggData.m_sizeofrawdata);
bResult = true;
}
catch (Exception ex)
{
sErrString = "读取记录数据失败: " + ex.Message;
}
finally
{
Marshal.FreeHGlobal(buffer);
}
return(bResult);
}
