C#调用Delphi Dll返回字符串的示例

//----------------------Delphi-------------------
procedure GetSqlData(ASource: PChar; ADest: PChar; ADestSize: Integer); stdcall;
var
S: string;
begin
if ASource = nil then Exit;
S := Format('%s 路过！',[ASource]);
Move(S[1], ADest^, Min(ADestSize, Length(S)+1));
end;{ GetSqlData }

exports
GetSqlData;

//----------------------C#-------------------
[DllImport(@"TempLib.dll")]
public static extern void GetSqlData(string ASource, StringBuilder ADest, int ADestSize);

private void button1_Click(object sender, EventArgs e)
{
StringBuilder vDest = new StringBuilder(1024);
GetSqlData("Zswang", vDest, 1024);
Text = vDest.ToString();
}