My App being default for a file type

[Dylan_Weber]

How do I make my app become the default for a file type, and if so, how do I make it interact with my Objetive-C scripts?

[ief2]

Launch Services can do the job:

#import <Foundation/Foundation.h>
#import <ApplicationServices/ApplicationServices.h>

OSStatus SetDefaultApplicationForUTI(const char *uti, const char *appID) {
CFStringRef fileUTI = CFStringCreateWithCString(kCFAllocatorDefault,
uti,
kCFStringEncodingUTF8);
CFStringRef bundleIdent = CFStringCreateWithCString(kCFAllocatorDefault,
appID,
kCFStringEncodingUTF8);

OSStatus status = LSSetDefaultRoleHandlerForContentType(fileUTI, 
                                                     kLSRolesAll, 
                                                     bundleIdent);

CFRelease(fileUTI);
CFRelease(bundleIdent);

return status;

}

void printUsage(const char *ap) {
printf(“Usage: %s [UTI] [Application Bundle Identfier]\n\n”, ap);
exit(1);
}

int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

if(argc != 3)
    printUsage(argv[0]);

const char *uti = argv[1]; // UTI
const char *appbid = argv[2]; // BUNDLE IDENTIFIER

OSStatus status = SetDefaultApplicationForUTI(uti, appbid);

if(status != noErr) {
    printf("Launch Services got an error: %d\n"
           "See Xcode's Launch Services Reference for more info\n", status);
    exit(2);
}
    

[pool drain];
return 0;

}

An example

./myExecutable public.html com.apple.TextEdit

Hope it helps,
ief2