🚀 go-pugleaf

Hoping this is a good place to post this..

I am accessing image files from a USB Compact Flash card reader and need to
catch the error if a flash card isn't in the reader.

Here is what I am trying to do, please assume all variables have been
declared and initialized..

    old_err_mode = SetErrorMode(SEM_FAILCRITICALERRORS);
    SetLastError(-1);
    dn = findfirst(FileName,&ffblk,0);  // find first file
    er = GetLastError();
    if(er != -1) {
        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, 0, er, 0, buffer,
sizeof(buffer), 0);
        ShowMsg("Unable to read Memory Card");
        ShowMsg(buffer);
    }
    SetErrorMode(old_err_mode);


This works fine, catches the error and reports as expected, however if I
then insert a memory card into the reader and call the above code again it
gives me an invalid handle error. If I shut down and re-start the app it
will read the card without the error.

Looking like I missed re-setting something that will allow it to try to read
the drive the second time. Any ideas on what I need to do eliminate the
invalid handle error?

Thanks,
Bob