Saving NSView to Bitmap - (ScrollView)

Question

I have an NSView subclass called StretchView. Here's what I want to do: Since the StretchView has scrollbars and is extended via those scrollbars I want to be able to grab the entire StretchView (including the area not visible on screen) and save that to a file.
// StretchView.h
#import <Cocoa/Cocoa.h>
@interface StretchView : NSView {
-(IBAction)saveImageButtonPushed(id)sender;
@end
// StretchView.m
#import "StretchView.h"
@implementation StretchView
-(IBAction)saveImageButtonPushed(id)sender
NSLog(@"saveImageButtonPushed");
NSBitmapImageRep *rep;
NSData *data;
NSImage *image;
[self lockFocus];
rep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:[self frame]];
[self unlockFocus];
image = [[[NSImage alloc] initWithSize:[rep size]] autorelease];
[image addRepresentation:rep];
data = [rep representationUsingType: NSPNGFileType properties: nil];
//save as png but failed
[data writeToFile: @"asd.png" atomically: NO];
//save as pdf, succeeded but with flaw
data = [self dataWithPDFInsideRect:[self frame]];
[data writeToFile:@"asd.pdf" atomically:YES];
@end
The problem is, the png file that generated is only part of the ScrollView (I tried to change the "initWithFocusedViewRect:[self frame]];" to "initWithFocusedViewRect:[self bounds]];" but in vain).
Then I tried to save the NSView content as pdf file and this time the whole view content was grabbed successfully but the backgound color was gone(I've set the content view's background as red but in the pdf file the background was white).
Can anybody give a hint, thans^_^

Answer 1

Hello Ori,
There is an example in the National Instruments example program database
that does this. It seems that CVI 5.x does not have a function that saves a
bitmap
to a file. But this example does exactly that.
check it out at the following page:
http://digital.ni.com/explprog.nsf/2222373937d4e9a​38625666a00831a24/b1384a94
02f57b13862564c80053702c?OpenDocument
If the link is broken, go to http://www.ni.com/support/ and then go to
the Example programs database. I used the following search string
"cvi and file and bitmap".
Good luck,
Azucena
"Ori Idan" wrote in message
news:[email protected]..
> I have an image on canvas indicator and I would like
> to be able to save it into a bitmap file using LabWindows/CVI 5.0.1.
>
> Any advice?
> Thanks,
>
> --
> Ori Idan
> Helicon technologies LTD. National Instruments Alliance member in ISRAEL
>
> Email: [email protected]
> Home page: http://www.helicontech.co.il
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