I got it working. It's kinda tricky to make it work properly.
Dont know why you didnt use normal version of NET_DVR_CapturePicture instead of NET_DVR_CapturePicture_V50 but i believe you had some reasons.
The NET_DVR_CapturePicture is much more easier and could be done within 5 mins.
Anyway I am going to share with both of solutions. It was quiet good chellenge for me and i couldnt take care of that earlier. Now after 2-3h struggling in total I got the solution.
Dll import:
[DllImport(@"\Hikvision\CppDlls\HCNetSDK.dll", EntryPoint = "NET_DVR_CapturePicture")]
public static extern bool NET_DVR_CapturePicture(int lRealHandle, string sPicFileName);
[DllImport(@"\Hikvision\CppDlls\HCNetSDK.dll", EntryPoint = "NET_DVR_CapturePicture_V50")]
public static extern bool NET_DVR_CapturePicture_V50(int lUserID, int lChannel, ref NET_DVR_PICPARAM_V50 lpPicParam, IntPtr sPicBuffer, uint dwPicSize, ref uint lpSizeReturned);
structure definitions:
public struct NET_DVR_PICPARAM_V50
{
public NET_DVR_JPEGPARA struParam;
public byte byPicFormat;
public byte byCapturePicType;
[MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 254, ArraySubType = UnmanagedType.I1)]
public byte[] byRes;
}
public struct NET_DVR_JPEGPARA
{
/*Note: If encoding resolution is VGA, it supports grabbing 0=CIF, 1=QCIF, 2=D1 image.
But if encoding resolution is 3=UXGA (1600x1200) , 4=SVGA (800x600) , 5=HD720p (1280x720) , 6=VGA, 7=XVGA, and 8=HD900p it only support grabbing image with current resolution*/
/*
0-CIF, 1-QCIF, 2-D1, 3-UXGA(1600x1200), 4-SVGA(800x600),5-HD720p(1280x720),
6-VGA, 7-XVGA, 8-HD900p, 9-HD1080, 10-2560*1920,
11-1600*304, 12-2048*1536, 13-2448*2048, 14-2448*1200, 15-2448*800,
16-XGA(1024*768), 17-SXGA(1280*1024),18-WD1(960*576/960*480), 19-1080i, 20-576*576,
21-1536*1536, 22-1920*1920, 23-320*240, 24-720*720, 25-1024*768,
26-1280*1280, 27-1600*600, 28-2048*768, 29-160*120, 75-336*256,
78-384*256, 79-384*216, 80-320*256, 82-320*192, 83-512*384,
127-480*272, 128-512*272, 161-288*320, 162-144*176, 163-480*640,
164-240*320, 165-120*160, 166-576*720, 167-720*1280, 168-576*960,
500-384*288,
0xff-Auto(Use resolution of current stream)
*/
public ushort wPicSize;
public ushort wPicQuality; /* 0 - the best, 1 - better, 2 - average; */
}
calling 'normal' version (keep in mind it requires RealPlay) (not 100% sure but I guess it saves as bmp only):
string picPath = @"D:\Temp\pic.bmp";
bool picCaptured = SDKMethods.NET_DVR_CapturePicture(realPlayId, picPath);
if (!picCaptured)
{
string message = string.Format("RealPlay failed, error code: {0}\n", SDKMethods.NET_DVR_GetLastError());
Console.WriteLine(message);
result.AddError(message);
result.IsSuccessful = false;
SDKMethods.NET_DVR_StopRealPlay(realPlayId);
SDKMethods.NET_DVR_Logout(lUserID);
SDKMethods.NET_DVR_Cleanup();
return result;
}
calling V50 version (saves as jpg file):
NET_DVR_JPEGPARA jpegParam = new NET_DVR_JPEGPARA();
jpegParam.wPicQuality = 0;
jpegParam.wPicSize = 0xff;
NET_DVR_PICPARAM_V50 picParam_V50 = new NET_DVR_PICPARAM_V50();
picParam_V50.struParam = jpegParam;
picParam_V50.byCapturePicType = 0;
picParam_V50.byPicFormat = 0;
uint picSize = 2500 * 2048;
StringBuilder picBufferStr = new StringBuilder((int)picSize);
byte[] picBuffer = new byte[picSize];
IntPtr picBufferPtr = new IntPtr();
uint lpSizeReturned = 0;
int channel = 36;
picBufferPtr = Marshal.AllocHGlobal(picBuffer.Length);
Marshal.Copy(picBuffer, 0, picBufferPtr, picBuffer.Length);
bool picCaptured = SDKMethods.NET_DVR_CapturePicture_V50(lUserID, channel, ref picParam_V50, picBufferPtr, picSize, ref lpSizeReturned);
if (!picCaptured)
{
string message = string.Format("CapturePicture_V50 failed, error code: {0}\n", SDKMethods.NET_DVR_GetLastError());
Console.WriteLine(message);
result.AddError(message);
result.IsSuccessful = false;
SDKMethods.NET_DVR_Logout(lUserID);
SDKMethods.NET_DVR_Cleanup();
return result;
}
byte[] imageRawData = new byte[(int)lpSizeReturned];
Marshal.Copy(picBufferPtr, imageRawData, 0, (int)lpSizeReturned);
System.IO.MemoryStream buf = new System.IO.MemoryStream(imageRawData);
Image image = Image.FromStream(buf, true);
image.Save(@"D:\Temp\test.jpg");
