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函数原形如下,vb6,vfp,delphi 都可以正常调用,.net要怎样声明?
function StrAddStr(inpustr:PChar ;Var OutPutstr:PChar):integer;stdcall;
var
str1:string;
begin
str1:=inpustr;
OutPutstr:=Pchar(str1+str1);
result:=0;
end;
c#声明
[DllImport("PayApiFun.dll", EntryPoint = "StrAddStr", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
static extern int StrAddStr(string inputstr,ref IntPtr outputstr);
string inputstr="我是中国人2019yes";
IntPtr outputs = Marshal.AllocHGlobal(255); 参数传入,申请内存空间
int real=StrAddStr(inputstr,ref outputs);
Marshal.PtrToStringAnsi(outputs).ToString(); 获取地址内信息