I'm trying to implement a feature in my app that will record the screen. I have bits of code that I have found in some sample code and a WWDC 2012 video.
So far I have this.
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
// Get a list of displays. Copied from working apple source code.
[self getDisplayList];
DisplayRegistrationCallBackSuccessful = NO;
// Register the event for modifying displays.
CGError err = CGDisplayRegisterReconfigurationCallback(DisplayRegisterReconfigurationCallback, NULL);
if (err == kCGErrorSuccess) {
DisplayRegistrationCallBackSuccessful = YES;
}
// Insert code here to initialize your application
const void *keys[1] = { kCGDisplayStreamSourceRect };
const void *values[1] = { CGRectCreateDictionaryRepresentation(CGRectMake(0, 0, 100, 100)) };
CFDictionaryRef properties = CFDictionaryCreate(NULL, keys, values, 1, NULL, NULL);
stream = CGDisplayStreamCreate(displays[0], 100, 100, '420f', properties,
^(CGDisplayStreamFrameStatus status, uint64_t displayTime, IOSurfaceRef frameSurface, CGDisplayStreamUpdateRef updateRef) {
NSLog(@"Next Frame"); // This line is never called.
});
runLoop = CGDisplayStreamGetRunLoopSource(stream);
CGError err = CGDisplayStreamStart(stream);
if (err == CGDisplayNoErr) {
NSLog(@"Works");
} else {
NSLog(@"Error: %d", err);
}
}
The problem I am encountering is that the callback block for the DisplayStream is not being called. I am not getting any errors or warnings. Is there something I'm missing or that I've done wrong?
I solved the problem by using CGDisplayStreamCreateWithDispatchQueue
and passing dispatch_queue_create("queue for dispatch", NULL);
as the queue.
对于它的价值,看起来你正在获得runloop源,但是然后没有将它添加到当前的运行循环(CFRunLoopAddSource)
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