둔재의 노트

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private void textBox_DragEnter(object sender, DragEventArgs e)
{
    if (e.Data.GetDataPresent(DataFormats.FileDrop)) e.Effect = DragDropEffects.Copy;
}
        
private void textBox_DragDrop(object sender, DragEventArgs e)
{
    string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
    foreach (string file in files) 
        Console.WriteLine(file);
} 

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- (void) loadAsyncImageFromURL:(NSURL *)url  imageBlock:(void (^) (UIImage *image))imageBlock errorBlock:(void(^)(void))errorBlock
{
    dispatch_async( dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0 ), ^(void){
	   NSData * data = [[NSData alloc] initWithContentsOfURL:url];
	   UIImage * image = [[UIImage alloc] initWithData:data];
	   dispatch_async( dispatch_get_main_queue(), ^(void){
		   if( image != nil )
		   {
			   imageBlock( image );
		   } else {
			   errorBlock();
		   }
	   });
   });
}