CGEventTapCreate
David E Blanton
Wim Lewis
On 20 Feb 2012, at 6:15 PM, David E Blanton wrote:
> When I run the following code it does not return from the call to CFRunLoopRun();
>
> How does one use CGEventTapCreate to get events?
If you're inside an application, which you presumably are since you have an IBAction method there, then the application is already invoking CFRunLoopRun (or equivalent); you don't usually want to recursively invoke it. If you simply return from -createTap:, the application's event loop will continue and will dispatch events to your cgEventCallback() as well as all the other event-handling routines necessary for the app to function. In general, you'll only need to call CFRunLoopRun() yourself if you've written a command-line tool or something similar that doesn't already have a run loop. There's probably a highlevel introduction to CF/NSRunLoops in the Conceptual Documentation part of the developer docs somewhere which will give you all the details you need.
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James Walker
> When I run the following code it does not return from the call to
> CFRunLoopRun();
>
> How does one use CGEventTapCreate to get events?
>
> My code is from docs I found and agrees with the Apple docs.
You shouldn't be calling CFRunLoopRun. A Cocoa app's main thread
already has a run loop that is running, courtesy of NSApplicationMain.
> =================
>
>
>
>
> CGEventRef cgEventCallback(CGEventTapProxy proxy, CGEventType type,
> CGEventRef event, void *refcon)
> {
> NSLog(@"cgEventCallback");
>
>
> int leftMouse = 0, rightMouse = 0;
> if (type == kCGEventLeftMouseDown) leftMouse = 1;
> if (type == kCGEventRightMouseDown) rightMouse = 1;
> if ( leftMouse || rightMouse)
> {
> NSLog(@"MOUSEDOWN");
> }
> return event;
> }
>
> - (IBAction)createTap:(id)sender
> {
> if([m_listnumberOfSelectedRows] == 1)
> {
> m_machPortRef= CGEventTapCreate(kCGHIDEventTap, kCGHeadInsertEventTap,
> 0,kCGEventLeftMouseDown, cgEventCallback, NULL);
> if(m_machPortRef)
> {
> CFRunLoopSourceRefrunLoopSource =
> CFMachPortCreateRunLoopSource(kCFAllocatorDefault, m_machPortRef, 0);
> CFRunLoopAddSource(CFRunLoopGetMain(), runLoopSource,
> kCFRunLoopCommonModes);
> CGEventTapEnable(m_machPortRef, true);
> CFRunLoopRun();
> }
> }
>
>
>
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--
James W. Walker, Innoventive Software LLC
<http://www.frameforge3d.com/>
David E Blanton
-db