托管，非托管相互转换
Marshal.PtrToStructure 方法 (IntPtr, Type)
将数据从非托管内存块封送到新分配的指定类型的托管对象。
参数
- ptr
-
指向非托管内存块的指针。
- structureType
-
要创建的对象的
返回值
一个托管对象，包含 ptr 参数指向的数据。
示例
[StructLayout(LayoutKind.Sequential)]
public class INNER
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]
public string field1 = "Test";
}
[StructLayout(LayoutKind.Sequential)]
public struct OUTER
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]
public string field1;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 100)]
public byte[] inner;
}
[DllImport(@"SomeTestDLL.dll")]
public static extern void CallTest( ref OUTER po);
static void Main(string[] args)
{
OUTER ed = new OUTER();
INNER[] inn=new INNER[10];
INNER test = new INNER();
int iStructSize = Marshal.SizeOf(test);
int sz =inn.Length * iStructSize;
ed.inner = new byte[sz];
try
{
CallTest( ref ed);
}
catch(Exception e)
{
Console.WriteLine(e.Message);
}
IntPtr buffer = Marshal.AllocCoTaskMem(iStructSize*10);
Marshal.Copy(ed.inner,0,buffer,iStructSize*10);
int iCurOffset = 0;
for(int i=0;i<10;i++)
{
inn[i] = (INNER)Marshal.PtrToStructure(new
IntPtr(buffer.ToInt32()+iCurOffset),typeof(INNER) );
iCurOffset += iStructSize;
}
Console.WriteLine(ed.field1);
Marshal.FreeCoTaskMem(buffer);
}