Delphi写的DLL，c#中如何调用?

[walkline]

delphi的dll代码如下：
procedure GetSystemCode( result:pchar);stdcall;
var
CPUID : TCPUID;
I : Integer;
m_cpuid : string;
m_biosinfo:string;
RBD: TRomBiosDump;
CSTR:String;
begin
。。。

c#调用方法：
[DllImport("CryLibray.dll")]
public static extern void GetSystemCode(byte[] str);
-----------------------------------------------------------------
怎么出现这样的错误呀？

Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
谢谢

[cangwu_lee]

procedure GetSystemCode(var result:pchar);stdcall;

还是长度的问题


--------------------------------------------------------------
程序，犹如人生。

[walkline]

[DllImport("CryLibray.dll")]
public static extern void GetSystemCode(byte[] str);

private void button1_Click(object sender, EventArgs e)
{
byte[] mybyte=new byte [100];
GetSystemCode(mybyte);
}
呵呵，我加了长度，怎么byte[0]到byte[99]都是空呀？是不是procedure GetSystemCode( result:pchar);stdcall;写错了呀！