read multiple files with quite similar names c++

Question

I am reading a file from current directory

ifstream myfile;
myfile.open("version1.1.hex");

Now a situation is arising that if user updates version then there will be version1.2.hex or version1.3.hex ..so on in the current directory, but one file at a time will be present. I want to write a code now which will cater this future need of reading different file.

I'm writing this code in C++/CLI.

Answer 1

Since file listings are a bit environment-dependant I am not sure if this is helpful to you, but here is an example how to achieve your goal under the mircosoft regime.

What is needed is the FindFirstFile / FindNextFile calls which query all files matching the fileSearchKey. Then you can use the cFileName part of WIN32_FIND_DATAA as parameter to your open command

string fileSearchKey = "version*";

WIN32_FIND_DATAA fd;

bool bFirstRun = true;
bool bFinishedRun = false;
HANDLE h = INVALID_HANDLE_VALUE;
while (!bFinishedRun)
{
    if (bFirstRun)
    {
        h = FindFirstFileA(fileSearchKey.c_str(), &fd); 
        bFirstRun = false;
    } else
    {
        if (FindNextFileA(h, &fd) != FALSE) 
        {
            // Abort with error because it has more than one file or decide for the most recent version
        } else
        {
            bFinishedRun = true;
        }
    }

}
// Load file
ifstream myfile;
myfile.open(fd.cFileName);