C # reads the data from the IntPtr

The C + + notation is:
LRESULT cpicturequerydlg::onquerypicnty (WPARAM WP, LPARAM LP)
{
EnableWindow (TRUE);

BYTE *pbymsg = (byte*) LP;

Get the current page number
M_dwcurcount = *reinterpret_cast<dword*> (pbymsg);
Get the total quantity
M_dwtotalcount = *reinterpret_cast<dword*> (pbymsg + sizeof (DWORD));

Get the query result pointer
tnvr_pic_grabtask* ptresultquery = reinterpret_cast<tnvr_pic_grabtask*> (pbymsg + sizeof (DWORD));
memset (m_atgrtask, 0, sizeof (tnvr_pic_grabtask) * nvr_maxnum_recordquery);
memcpy (M_atgrtask, ptresultquery, M_dwcurcount * sizeof (tnvr_pic_grabtask));
}

You've got IntPtr. You can use type casting to get something in IntPtr:

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123	(要获取的类型)Marshal.PtrToStructure(ptr,typeof(要获取的类型)); //这样就转换到你c#可以操作的数据类型然后来读取内容， //我不知道这个在你那里能否适用，因为PtrToStructure并不是所有情况都适用,如果用这个方法的话具体可以看看MSDN

The main thing is to get the length of the type, and if the length gets inaccurate, the data read will be problematic.
(Structuretype) Marshal.PtrToStructure ((INTPTR) ((UINT) (pbymsg + sizeof (UINT) * 2 + i * marshal.sizeof (typeof (Structuretype))), typeof ( Structuretype));

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using System; using System.Collections.Generic; using System.Linq; using System.Runtime.InteropServices; using System.Text;  namespace OpenCover.Framework.Communication {     public interface IMarshalWrapper     {         T PtrToStructure<T>(IntPtr pinnedMemory);         void StructureToPtr<T>(T structure, IntPtr pinnedMemory, bool fDeleteOld);     }      public class MarshalWrapper : IMarshalWrapper     {         public T PtrToStructure<T>(IntPtr pinnedMemory)         {             return (T)Marshal.PtrToStructure(pinnedMemory, typeof(T));         }          public void StructureToPtr<T>(T structure, IntPtr pinnedMemory, bool fDeleteOld)         {             Marshal.StructureToPtr(structure, pinnedMemory, fDeleteOld);         }     } }

C # reads the data from the IntPtr