c# 调用C++生成的DLL文件

[MCOP_Jacob]

int MakeWorkCard(char *SystemCode);长度4个字节

[DllImport("card.dll", EntryPoint = "MakeWorkCard", CharSet = CharSet.Ansi, SetLastError = true)]

用 public static extern int MakeWorkCard(ref byte SystemCode);
还是用
public static extern int MakeWorkCard(byte [] SystemCode);


还有在调用时

byte[] _myString = new byte[8];

然后又怎么写下去呢？

本人想学多一点，在线等

[云瑀]

[DllImport("card.dll", EntryPoint = "MakeWorkCard", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern int MakeWorkCard(string SystemCode);
string _myString = ""; 
MakeWorkCard(_myString);

这样您觉得？

[MCOP_Jacob]

当然不行 一个是指针类型，一个是STRING

[MCOP_Jacob]

如果写成 public static extern int MakeWorkCard(char* SystemCode);

int i = Card.MakeWorkCard((char*)Marshal.StringToHGlobalAnsi("BD49CA0C").ToPointer());

这样是不是会出现乱码？

[gongsun]

public static extern int MakeWorkCard(byte [] SystemCode);

[WM_JAWIN]

用unsafe代码
public static extern int MakeWorkCard( byte* SystemCode);