问题描述

急，求大神帮帮忙，关于C#调用delphi的dll文件抛错问题

[DllImport(_fileDll EntryPoint = ""JX102R_Read_Card""
CharSet = CharSet.Ansi CallingConvention = CallingConvention.StdCall)]
public static extern int JX102R_Read_Card(ref int ReaderNo ref StringBuilder CardNo ref StringBuilder clientIP);

int readerNo = 0;
StringBuilder cardNo = new StringBuilder();
StringBuilder clientIP = new StringBuilder();
int num = JX102R_Read_Card(ref readerNo ref cardNo ref clientIP);

调用的时候抛错：C# 尝试读取或写入受保护的内存。这通常指示其他内存已损坏。

在Pb上面是能成功调用的

解决方案

http://bbs.csdn.net/topics/370255271