Parameters of GetPrivateProfileInt method

Question

Question: How to use string/char* variable as the path parameter to GetPrivateProfileInt method.

I m trying to use GetPrivateProfileInt given for windows. The following code runs perfeclty without any issue:

int x = GetPrivateProfileInt(L"x",L"y",1,L"This\\is\\the\\path");

But in my case, the path is being passed to the function. Something like this:

void fun(std::string path)
{
  //error const char* is incampatible with LPCWSTR.
  int x = GetPrivateProfileInt(L"x",L"y",1,path.c_str());
}

In some attempts given below, x is recieving the default value. i.e. the path is not being passed to the GetPrivateProfileInt method correctly.

Following are several other attempts made by me:

Attempt1:

// No error, default value is being read.
int x = GetPrivateProfileInt(L"x",L"y",1,(LPCTSTR)path.c_str());

Attempt2:

// No error, default value is being read.
int x = GetPrivateProfileInt(L"x",L"y",1,(wchar_t*)path.c_str());

Attempt3:

//_T() macro giving error.
// 'Ls' : undeclared identifier.identifier "Ls" is undefined.
LPCTSTR path_s = _T(path.c_str());
int x = GetPrivateProfileInt(L"x",L"y",1,path_s);

I went through the answers here but not able find out the solution.

Ben Voigt · Accepted Answer · 2016-12-05 19:36:08Z

1

There are two versions of the function, one takes UCS-2 characters (GetPrivateProfileIntW) and one takes char characters (GetPrivateProfileIntA). There are no versions which allow you to mix the parameters. Your options are to either change the appname and keyname parameters to single-byte to match your data

GetPrivateProfileIntA("x", "y", 1, path.c_str());

or to convert the last parameter to UCS-2 using MultibyteToWideChar, then call GetPrivateProfileIntW.

Pointer-casting is NOT a conversion of the character encoding, and will not work. The compiler type system is there to help you, and making it shut up with a cast is nearly always the wrong thing to do (exception: the return value of GetProcAddress does need a cast).

answered Dec 5, 2016 at 19:36

Ben Voigt

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