get path file in current directory in project

Use GetModuleFileName()[^].

char exe_path[MAX_PATH];
if (DWORD len = GetModuleFileName(NULL, exe_path, sizeof(exe_path)/sizeof(exe_path[0])))
{
    // removing the filename of the exe, leaving there just the directory part...
    while (len>0 && exe_path[len-1]!='\\')
        --len;
    exe_path[len] = 0;
    // now exe_path holds the directory that contains the exe file with a trailing backslash
    strcat(exe_path, "myfile.txt");
    // blah blah blah
}

TCHAR szExe[MAX_PATH];
GetModuleFileName(NULL, szExe, sizeof szExe / sizeof TCHAR);
szExe[strrchr(szExe, '\\') - szExe + 1] = '\0';
 
if the EXE file is C:\Window\test.exe, then the value of szExe is "C:\\Windows\".You can see there is a '\' at last.