The definition and use of C # struct pointers (IntPtr usage)

Before you can parse the C # struct pointer, you must know how the C # struct body is defined. The struct is also defined in C #.

C # struct-body pointers in C # structure definition:

2. [StructLayout (LayoutKind.Sequential)]
6. Public struct Vgastat
10. {
14. public int channelnum; Number of channels
20. [MarshalAs (UnmanagedType.ByValArray, SizeConst = 64)]
24. Public char[] Version; Version Information
28. public uint CPUUsage; CPU Consumption
32. Public bool Workstatusok; //Working status
38. [MarshalAs (UnmanagedType.ByValArray, SizeConst = 4)]
42. Public tagcheckarg[] channelstatistic; //Channel information
46. }

Once you have defined a struct, you can convert the received C # struct pointer to a defined struct body object.

1. Vgastat entries = (vgastat) marshal.ptrtostructure (Iptr, typeof (Vgastat));
3. The iptr is the unmanaged struct pointer received.

Conversely, structs can also be marshaled to unmanaged memory.

If the VGA is a struct that is instantiated and assigned after the definition.

1. IntPtr IntPtr = Marshal.allochglobal (marshal.sizeof (VGA));
3. Marshal.structuretoptr (VGA, IntPtr, true);
5. Send the IntPtr pointer here to the destination party
7. Marshal.freehglobal (IntPtr); //Releases the allocated unmanaged memory.

The definition of C # struct pointer and the related content of its use that's what I'm going to introduce you to, and hopefully it helps to understand and learn about C # struct pointers.

Convert String to Intptr:intptr System.Runtime.InteropServices.Marshal.StringToCoTaskMemAuto (string)

Convert IntPtr to String:string System.Runtime.InteropServices.MarshalPtrToStringAuto (INTPTR)

Http://msdn.microsoft.com/zh-cn/library/system.runtime.interopservices.marshal%28v=vs.110%29.aspx

The definition and use of C # struct pointers (IntPtr usage)