将c结构封送为c#
本文关键字:结构 | 更新日期: 2023-09-27 18:20:34
是否有任何主体可以封送c#中的这部分c/c++代码?
typedef struct
{
BYTE bCommandCode;
BYTE bParameterCode;
struct
{
DWORD dwSize;
LPBYTE lpbBody;
}
Data;
}
COMMAND, *LPCOMMAND;
非常感谢
首先,将上面的结构声明为托管结构-类似于:
[StructLayout(LayoutKind.Sequential)]
struct SomeStruct
{
byte bCommandCode;
byte bParameterCode;
SomeOtherStruct otherStruct;
Data Data;
}
struct SomeOtherStruct
{
uint dwSize;
byte lpBody;
}
struct Data
{
}
尽管您可能需要在这里和那里使用MarshalAs
属性,以确保它实际上将它们编组为正确的类型。例如,如果你想从内存中读取这个结构,你可以做一些类似的事情:
var bytes = ReadBytes(address, Marshal.SizeOf(typeof(SomeStruct)), isRelative);
fixed (byte* b = bytes)
return (T) Marshal.PtrToStructure(new IntPtr(b), typeof (SomeStruct));
我假设您想从内存中读取结构并将其封送到托管结构中,因为否则您甚至根本不需要Marshal
。此外,请确保在启用/unsafe
的情况下编译上述代码。
//01. Declare 'Command' structure
public struct Command
{
public byte CommandCode;
public byte ParameterCode;
public struct Data
{
public uint Size;
public IntPtr Body;
}
public Data SendData;
}
//02. Create & assign an instance of 'Command' structure
//Create body array
byte[] body = { 0x33, 0x32, 0x34, 0x31, 0x30 };
//Get IntPtr from byte[] (Reference: http://stackoverflow.com/questions/537573/how-to-get-intptr-from-byte-in-c-sharp)
GCHandle pinnedArray = GCHandle.Alloc(body, GCHandleType.Pinned);
IntPtr pointer = pinnedArray.AddrOfPinnedObject();
//Create command instance
var command = new CardReaderLib.Command
{
CommandCode = 0x30,
ParameterCode = 0x30,
SendData = {
Size = (uint) body.Length,
Body = pointer
}
};
//do your stuff
if (pinnedArray.IsAllocated)
pinnedArray.Free();