从具有非托管导出的C＃DLL中返回一个字符串到Inno安装脚本

问题描述

我有一个C＃DLL，它使用类型，这是用于interop函数调用的数据类型。在C＃方面，您可以使用 UnmanagedType.BStr 类型来编组您的字符串，而在Inno安装方面，您将使用 WideString ，它兼容类型。所以你的代码会改为这个（另见章节）：

I would suggest you to use the BSTR type, which is used to be a data type for interop function calls. On your C# side you'd marshall your string as the UnmanagedType.BStr type and on the Inno Setup side you'd use the WideString, which is compatible with the BSTR type. So your code would then change to this (see also the Marshalling sample chapter of the Unmanaged Exports docs):

[DllExport("Test", CallingConvention = CallingConvention.StdCall)]
static int Test([MarshalAs(UnmanagedType.BStr)] out string strout)
{
    strout = "teststr";
    return 0; // indicates success
}

而在Inno安装方面，使用 WideString 到：

And on the Inno Setup side with the use of WideString to this:

[Code]
function Test(out strout: WideString): Integer;
  external 'Test@files:testdll.dll stdcall';

procedure CallTest;
var
  retval: Integer;
  str: WideString;
begin
  retval := Test(str);
  { test retval for success }
  Log(str);
end;

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