check keydown event characters length before returning the pressed character code

2 years ago · 6ffe686ba8
parent a924bbfc30
commit 6ffe686ba8
1 changed files with 1 additions and 1 deletions
--- a/modules/highgui/src/window_cocoa.mm
+++ b/modules/highgui/src/window_cocoa.mm
@ -618,7 +618,7 @@ CV_IMPL int cvWaitKey (int maxWait)
         inMode:NSDefaultRunLoopMode
         dequeue:YES];

-        if([event type] == NSKeyDown) {
+        if([event type] == NSKeyDown && [[event characters] length]) {
            returnCode = [[event characters] characterAtIndex:0];
            break;
        }