调用vc的dll 返回 char * 怎样接收？？？ 我快疯了！！！不揭帖不睡觉
VC 的头文件这样声明的
_PORT_ char *OCode(unsigned long fIDMode,bool fReference,char *lpFileName);

我这样调用
[DllImport(@"OCode.dll")]
public static extern StringBuilder OCode(long fIDMode, bool fReference,StringBuilder s);


StringBuilder a1 = new StringBuilder("132132");

StringBuilder b1 = new StringBuilder();

b1 = OCode(2, false, ddd);
不管怎样都得不到返回值，高手给我看看，调用是否正确？？？



[解决办法]
vc:unsigned long -->c#:uint
[解决办法]
[DllImport(@"OCode.dll")]
public static extern StringBuilder OCode(uint fIDMode, bool fReference,StringBuilder s);


试一试
[解决办法]
[DllImport(@"OCode.dll")]
public static extern StringBuilder OCode(uint fIDMode, bool fReference,StringBuilder s);

[解决办法]
stringbuilder是引用类型 -- 》 char*

string类型不能作为指针用

实在不行直接设置一个不安全代码段 直接对着引用调用
[解决办法]
[DllImport(@"OCode.dll")]
public static extern StringBuilder OCode(uint fIDMode, bool fReference,string s);
[解决办法]
[DllImport(@"OCode.dll", EntryPoint = "JL_GetOneReport", CallingConvention = CallingConvention.StdCall)]
public static extern string OCode(uint fIDMode, bool fReference, string s);




[DllImport(@"OCode.dll", EntryPoint = "JL_GetOneReport", CallingConvention = CallingConvention.StdCall)]
public static extern string OCode(uint fIDMode, bool fReference, ref string s);