gssc.mm

   1 #import <GraphicsServices/GraphicsServices.h>
   2 #import <UIKit/UIKit.h>
   3 #include <stdio.h>
   4 #include <dlfcn.h>
   5
   6 static CFArrayRef (*$GSSystemCopyCapability)(CFStringRef);
   7 static CFArrayRef (*$GSSystemGetCapability)(CFStringRef);
   8
   9 void OnGSCapabilityChanged(
  10     CFNotificationCenterRef center,
  11     void *observer,
  12     CFStringRef name,
  13     const void *object,
  14     CFDictionaryRef info
  15 ) {
  16     CFRunLoopStop(CFRunLoopGetCurrent());
  17 }
  18
  19 int main(int argc, char *argv[]) {
  20     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  21
  22     NSString *name = nil;
  23
  24     if (argc == 2)
  25         name = [NSString stringWithUTF8String:argv[0]];
  26     else if (argc > 2) {
  27         fprintf(stderr, "usage: %s [capability]\n", argv[0]);
  28         exit(1);
  29     }
  30
  31     $GSSystemCopyCapability = reinterpret_cast<CFArrayRef (*)(CFStringRef)>(dlsym(RTLD_DEFAULT, "GSSystemCopyCapability"));
  32     $GSSystemGetCapability = reinterpret_cast<CFArrayRef (*)(CFStringRef)>(dlsym(RTLD_DEFAULT, "GSSystemGetCapability"));
  33
  34     CFNotificationCenterAddObserver(
  35         CFNotificationCenterGetDarwinNotifyCenter(),
  36         NULL,
  37         &OnGSCapabilityChanged,
  38         CFSTR("GSCapabilitiesChanged"),
  39         NULL,
  40         NULL
  41     );
  42
  43     const NSArray *capability;
  44
  45     for (;;) {
  46         if ($GSSystemCopyCapability != NULL) {
  47             capability = reinterpret_cast<const NSArray *>((*$GSSystemCopyCapability)(reinterpret_cast<CFStringRef>(name)));
  48             if (capability != nil)
  49                 capability = [capability autorelease];
  50         } else if ($GSSystemGetCapability != NULL) {
  51             capability = reinterpret_cast<const NSArray *>((*$GSSystemGetCapability)(reinterpret_cast<CFStringRef>(name)));
  52         } else {
  53             capability = nil;
  54             break;
  55         }
  56
  57         if (capability != nil)
  58             break;
  59
  60         CFRunLoopRun();
  61     }
  62
  63     NSLog(@"%@", capability);
  64
  65     /*for (NSString *value in capability)
  66         printf("%s\n", [value UTF8String]);*/
  67
  68     [pool release];
  69
  70     return 0;
  71 }