C# 调用C写的DLL时 对应的int* 类型返回值转化为 IntPtr

C中代码：

int* read(char*filename)
{
.......
}

C#中代码：

[DllImport("myC.dll",EntryPoint="read",CharSet=CharSet.Auto)]
publicstaticextern IntPtr read(refbytefilename);

调用示例：

stringname=@"d:\result\Gaussian_6_0.3.jpg";
byte[]filename=newbyte[100];
for(inti=0;i<name.Length;i++)
{
filename[i]=(byte)name[i];
}
 IntPrt data = new IntPtr();
 data = liblept168.read(reffilename[0]);