I've made a Mac App with a custom view that is a destination for dragging and dropping files. My view has registered as a destination and I've implemented the drag operation methods. Everything works fine when I build and run the App from XCode, but when I open the .app from Finder dragging files does not work and I see the following error in Console:
Canceling drag because exception 'NSInvalidArgumentException' (reason 'launch path not accessible') was raised during a dragging session
Anyone know what the means or why it's happening? Here is the relevant code:
#import "DragDestinationView.h"
@implementation DragDestinationView
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// register for dragging types
[self registerForDraggedTypes:[NSArray arrayWithObjects:NSFilenamesPboardType, nil]];
highlight = NO;
}
return self;
}
- (void)drawRect:(NSRect)dirtyRect
{
[super drawRect:dirtyRect];
if ( highlight ) {
//highlight by overlaying a gray border
[[NSColor whiteColor] setFill];
NSRectFill(dirtyRect);
[self setWantsLayer:YES];
self.layer.masksToBounds = YES;
self.layer.borderWidth = 10.0f;
[self.layer setBorderColor:[[NSColor grayColor] CGColor]];
}
else {
[self.layer setBorderColor:[[NSColor clearColor] CGColor]];
}
}
#pragma mark - Destination Operations
- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender {
NSPasteboard *pboard = [sender draggingPasteboard];
if ([[pboard types] containsObject:NSFilenamesPboardType]) {
// check if it's a bin
NSString* filePath = [[NSURL URLFromPasteboard: [sender draggingPasteboard]] absoluteString];
if ([[[filePath substringFromIndex:[filePath length] - 4] lowercaseString] isEqualToString:@".bin"]) {
// it's a bin
highlight = YES;
[self setNeedsDisplay:YES];
return NSDragOperationCopy;
}
}
return NSDragOperationNone;
}
- (void)draggingExited:(id <NSDraggingInfo>)sender
{
//remove highlight of the drop zone
highlight=NO;
[self setNeedsDisplay: YES];
}
- (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender
{
//finished with the drag so remove any highlighting
highlight=NO;
[self setNeedsDisplay: YES];
return YES;
}
- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{
if ( [sender draggingSource] != self ) {
NSString* filePath = [[NSURL URLFromPasteboard: [sender draggingPasteboard]] absoluteString];
filePath = [filePath substringFromIndex:7];
filePath = [filePath stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"file path = %@",filePath);
// send notification
[[NSNotificationCenter defaultCenter] postNotificationName:@"filePathString" object:filePath];
}
return YES;
}
@end
Note: The draggingEntered: method returns NSDragOperationCopy because I like the arrow cursor with the green circle and plus that tells the user they can drag a file here. All I'm actually doing with the dropped file is grabbing its path location.
