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Opening a wildcard of filetype

T3rminal
T3rminal asked
on
Medium Priority
322 Views
Last Modified: 2010-04-15
Hi,

So you would have the below to open a single file e.g. 'hello.dat' but how would you go about opening '*.dat'? I assume you'd need some sort of way to check if any other files existed before opening the next.

int main(int argc, char * argv)
{
   File * mpp = fopen("argv[1]", "r");
}
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ozo
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Most Valuable Expert 2014
Top Expert 2015
Commented:
There is no way in pure C to check wildcards in a directory, but depending on your operating system, you might use
#include <sys/types.h>
     #include <dirent.h>

     DIR *
     opendir(const char *filename);

     struct dirent *
     readdir(DIR *dirp);
to look for matching file names

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ozo
CERTIFIED EXPERT
Most Valuable Expert 2014
Top Expert 2015

Commented:
or on some systems
     #include <glob.h>

     int
     glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
         glob_t *pglob);

     void
     globfree(glob_t *pglob);

Author

Commented:
Ya, I can see how the first would work, and could probably get that to file type eventually?  Not quite what I had in mind though, would be a lot of work to take a wildcard from command line.
In Windows you can use the FindFistFile(),FindNextFile(), PathMatchSpec() APIs to do what you want.
in most unix shells you wouldn't need to do anything to handle wildcards from the commandline, as the shell will expand *.dat to all matching files alread (so if files 1.dat and 2.dat exist, your program will be called with two arguments when calling "./foobar *.dat")
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