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我正在编写一个下载图像并打印它的 webkit 插件。我已经验证下载了正确的数据并且 NSImage 具有正确的尺寸。不幸的是，包含图像的 NSImageView 不显示任何内容，既不在发送到打印机的文档中，也不在包含视图的窗口中，因为它是内容视图的唯一子视图。这是我的代码：

-(void)printImageAtURL:(NSString*)imageUrl{ 
    NSURLResponse *response;
    NSError *error = nil;

    NSURL *url = [NSURL URLWithString:imageUrl];
    NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:20];
    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    if(error)
         return;
    //Data is the correct length
    NSImage *image = [[NSImage alloc] initWithData:data];

    NSSize imageSize = [image size];
    //imageSize is correct dimensions

    NSRect viewRect = NSMakeRect(0, 0, imageSize.width, imageSize.height);

    NSImageView *imageView = [[NSImageView alloc] initWithFrame:viewRect];
    [imageView setImage:image];
    [image release];

    NSPrinter *printer = [NSPrinter printerWithName:[[NSPrinter printerNames] objectAtIndex:0]];
    NSPrintInfo *printInfo = [[NSPrintInfo alloc] init];
    [printInfo setPrinter:printer];

    NSPrintOperation *printOp = [NSPrintOperation printOperationWithView:imageView printInfo:printInfo];
    [printOp setShowsPrintPanel:NO];
    [printOp runOperation];
    //The print job is an empty page :(

    //Pop-up a window just to test the image view
    NSWindow * window = [[NSWindow alloc] init];
    [window makeKeyAndOrderFront:self];
    [window setFrame:viewRect display:YES];
    [[window contentView] addSubview:imageView];
    //The window is sized correctly but empty :(

    [printInfo release];
    [imageView release];

}

谢谢！

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1 回答 1

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You probably solved it by now, but.

  1. Try to load a local file (ie, not network). Maybe there are some encoding issues somewhere and NSImage can't properly parse the file?

  2. Try using NSImageCell instead of NSImageView.

Looks like imageView isn't right, because it fails on screen and in print..

HTH

于 2009-10-30T17:32:31.780 回答