将std :: string传递给C ++ DLL以与C＃DLL一起使用

Question

I am trying to pass strings from a C++ console app to a C++ dll, which i then convert to System::string to be sent to a C# dll. But the string comes through as random characters. Note that lShutdown actually comes through correct as it is defined in the dll so the problem must be between the testapp and the C++ dll. I had this working before, but i cant figure out for the life of me how i did it

Here is the code for passing to the dll:

void GMSTestAppC::GMSSetup()
{
    string processName = "GMSCTestApp";
    string progName = "TestApp";
    //Directory where program is installed
    string progDir = "C:/";
    string version = "4.0.0.1";
    //Directory for config file
    string configDir = "C:/";
    //Directory for log files
    string logDir = "C:/";
    string user = "Smurf";
    string shutdownby = "";
    Initialize(processName, GetCurrentProcessId(), progName, progDir, version, configDir, logDir, user, shutdownby);
}

Here is the dll code:

bool Initialize(std::string& processName, int processID, std::string& programName, std::string& programDir, std::string& version, std::string& configDir, std::string& logDir, std::string& currentUser, std::string& lastShutDownBy)
    {
        String^ pName = gcnew String(processName.c_str());
        String^ progName = gcnew String(programName.c_str());
        String^ progDir = gcnew String(programDir.c_str());
        String^ cDir = gcnew String(configDir.c_str());
        String^ lDir = gcnew String(logDir.c_str());
        String^ cUser = gcnew String(currentUser.c_str());
        String^ lShutdown = gcnew String("test");
        GMS::GMSVersion fv;
        sscanf_s(version.c_str(), "%d.%d.%d.%d", &fv.Major, &fv.Minor, &fv.Revision, &fv.Build);
        int pID = int(processID);

        Return GMS::Initialize(pName, pID, progName, progDir, fv, cDir, lDir, cUser, lShutdown);
    }

Here is what i actually get through:

Sent: <InitializeProgram>
      <TimeStamp>2018-01-22T14:34:37.6152709+00:00</TimeStamp>
      <PID>13504</PID>
      <ProcessName>(÷'</ProcessName>
      <ProgramName>Ðð'</ProgramName>
      <ProgramDir>°ñ'</ProgramDir>
      <Version>0.0.0.0</Version>
      <ConfigDir>^ô'</ConfigDir>
      <LogDir>èñ'</LogDir>
      <CurrentUser>÷'</CurrentUser>
      <LastShutDownBy>test</LastShutDownBy>
    </InitializeProgram>

The characters that come through are different each time the program is run

Any help would be greatly appreciated

Answer 1

If you are using C++11 (which you most probably be using), you can try using std::u32string . It removes the need to use std::wstring and is standard across platforms.