Cannot convert CHAR to LPWSTR

I encountered a compilation error in Visual Studio 2015, that I am trying to convert char data to LPWSTR. Can I? Or does it work only with string types?

Here is a piece of my code :

    ⋮
FILE *sortie;
char fichier[256];//   <--- HERE s my char table

int main(int argc, char *argv[])
{
    //on masque 
    HWND hwnd = GetForegroundWindow();
    ShowWindow(hwnd, SW_HIDE);

    int i, lettre, result, lastresult, lastletter, compteur;

    GetCurrentDirectory(256, fichier); 
    strcat(fichier, "\\fichierlog.txt");

Before posting my question I was at:

1. https://msdn.microsoft.com/query/dev14.query?appId=Dev14IDEF1&l=EN-US&k=k%28C2664%29&rd=true

2. C++ cannot convert from enum to LPCTSTR

3. How to Convert char* to LPWSTR in VC++?

I didn't find my case :(

Instead of your current code:

FILE *sortie;
char fichier[256];//   <--- HERE s my char table

int main(int argc, char *argv[])
{
    //on masque 
    HWND hwnd = GetForegroundWindow();
    ShowWindow(hwnd, SW_HIDE);

    int i, lettre, result, lastresult, lastletter, compteur;

    GetCurrentDirectory(256, fichier); 
    strcat(fichier, "\\fichierlog.txt");

do e.g.

auto main() -> int
{
    //on masque 
    HWND hwnd = GetForegroundWindow();
    ShowWindow(hwnd, SW_HIDE);

    int i, lettre, result, lastresult, lastletter, compteur;

    std::wstring fichier( MAX_PATH, L'\0' );//   <--- HERE s my char table
    const DWORD len = GetCurrentDirectory( fichier.size(), &fichier[0] );
    if( len == 0 || len >= fichier.size() ) { throw std::runtime_error( "GetCurrentDirectory failed." ); }
    fichier.resize( len );
    fichier += L"/fichierlog.txt";

    std::ifstream sortie( fichier );

This should fix three issues:

• You're compiling as Unicode (probably a Visual Studio project), but the code is for the Windows ANSI API.

• You're using a C++ compiler, but the code is low level C.

• Too small buffer for maximum path length, and possible buffer overrun for the concatenation.

Note that the ifstream constructor that accepts a wide string is a Microsoft extension. It will however be practically required for Windows C++ compilers by the file system addition to the standard library in C++17.