C#中调用dll,函数参数带指针，如何改写？

Posted 2023-03-19

原动态链接库UA300.DLL中的函数原型为：
void_stdcall readdata(HANDLE husb, short* addat, unsigned short fcode, long leng)
在C#中调用，如下改写是否正确？
[DllImport("UA300.DLL", CharSet = CharSet.Unicode, EntryPoint = "readdata",SetLastError=true,ExactSpelling=true,CallingConvention=CallingConvention.StdCall,PreserveSig=true)]

unsafe public static extern void readdata(IntPtr husb,
short* addat, ushort fcode, Int32 leng);

unsafe public short[] data = new short[4096];
unsafe private void button1_Click(object sender, EventArgs e)


fixed (short* k = data)

readdata(husb, k , 3000, 256);

试了，还是不行，到底应该怎么写啊？？急求解决方法！非常感谢大家帮忙
能就我提问的函数给具体改写一下吗？我是个初学者

试一下：

把“short*”改为“ref short”
[DllImport("UA300.DLL", CharSet = CharSet.Unicode, EntryPoint = "readdata",SetLastError=true,ExactSpelling=true,CallingConvention=CallingConvention.StdCall,PreserveSig=true)]

unsafe public static extern void readdata(IntPtr husb,
ref short addat, ushort fcode, Int32 leng);

调用时也加上ref：
readdata(husb, ref k , 3000, 256); 参考技术A 不知道你能不能看到我空间的日志...
http://user.qzone.qq.com/37208828?ptlang=2052
《与非托管Dll的交互》

网上很多方法都不行 研究的三天才知道的