Need a hand in Windows batch processing syntax - loops

Question

I have compiled a C++ program on Windows, and I need it to process a huge number of my data files. The files are named, for instance, "x0000y" to "x9999y".
The C++ program only takes one file at a time, create the output of each respective file, save somewhere, and terminate. I do not want to hard code the program, as my data set does not always have the same number of files - and keep recompiling the program just for this is not cool. So I am looking for a quick way of doing this: batch processing.
Here comes the trouble: I am having trouble trying to get the batch syntax correct and valid. So could somebody show me the following pseudocode in batch processing version?:
for (int i = 0; i < lastFile; i++){
String filename;
/*
Because the files are named "x0000y", "x0034y", etc.
We need to put in all the extra 0s in the string if i is less than 1000.
*/
String numberedString = convertNumToFourDigit(i);
filename = "myFileName" + numberedString + "Footer";
/*
execute the program with the respective filename.
*/
execute("MyProgram.exe " + filename);
}

Answer 1

This is all you'll need in your .bat file to run your program against all of the files in the current directory.
for %%I IN (*) DO ( MyProgram.exe %%I )
If the data files are in a subdirectory with an extension, here's an example.
for %%I IN (subdir\*.dat) DO ( MyProgram.exe %%I )
If you only want files in the form of x0000y, then this will do the trick.
for %%I IN (x????y) DO ( MyProgram.exe %%I )
These will process the data files in whatever order the filesystem provides their names.