C++ Interop behaves differently when called from windows service

Question

I have a C# executable that makes an interop call to a C++ library:

[DllImport(DLL_NAME, CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
[return: MarshalAs(UnmanagedType.I4)]
public static extern int Check(string name, string version, bool debug);

In the C++ code, I redirect std::cout to a file:

std::streambuf* psbuf, * backup;
std::ofstream filestr;

...

if (debug)
{
    filestr.open("debug.txt");
    backup = std::cout.rdbuf();
    psbuf = filestr.rdbuf();
    std::cout.rdbuf(psbuf);

    std::cout << "some debug message" << std::endl; 

    std::cout.rdbuf(backup);
    filestr.close();
}

This works fine when I run the C# executable as a console program, but when I run it as a Windows Service, the file is not created by the C++ code.

What would account for this difference?

Paul · Accepted Answer · 2020-04-07 11:57:45Z

1

The file actually is being created, but the working directory when running as a service is different: as explained here

answered Apr 7, 2020 at 11:57

Paul

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