如何制作滚动窗口的屏幕剪切，整个部分不仅是mac上的可见部分

Question

我正在mac OS X上写一个sreen cut APP，我只能这样看到窗口的可见部分：

CGImageRef imageRef = CGWindowListCreateImage(CGRectNull,
                                              kCGWindowListOptionIncludingWindow,
                                              self.windowID,
                                              kCGWindowImageBoundsIgnoreFraming);
_windowImage = [[NSImage alloc] initWithCGImage:imageRef size:self.windowFrame.size];
CGImageRelease(imageRef);

但是当窗口可以滚动时，我想让整个部分不仅仅是可见部分，是否有人有一些建议？ 谢谢！

Answer 1

//capture 获取scrollview的截图
NSRect bounds = NSMakeRect(0, 0,  [self.scrollView.documentView     frame].size.width,[self.scrollView.documentView frame].size.height);

//  //只能获取可见部分 only can grap the visible part of the scrollview
//  NSBitmapImageRep* captureImage = [(NSView      *)self.scrollView.documentView     bitmapImageRepForCachingDisplayInRect:bounds];
//  [self.scrollView cacheDisplayInRect:bounds toBitmapImageRep:captureImage];
//  NSImage *image = [[NSImage alloc] initWithCGImage:[captureImage CGImage] size:captureImage.size];

//can grab the whole part
[self.scrollView lockFocus];
NSImage *image = [[NSImage alloc] initWithData:[(NSView *)self.scrollView.documentView
                                                  dataWithPDFInsideRect:bounds]];
[self.scrollView unlockFocus];