I can not use sourceType as UIImagePickerControllerSourceTypePhotoLibrary in ZBarSDK - photolibrary

Question

I download ZBarSDK 1.2 in http://zbar.sourceforge.net/download.html
It works well when I set the sourceType of ZBarReaderViewController as UIImagePickerControllerSourceTypeCamera.
But when I set the sourceType as UIImagePickerControllerSourceTypePhotoLibrary or UIImagePickerControllerSourceTypeSavedPhotosAlbum,the app crashed and I got the error as follow:
2012-05-28 17:23:03.476 Wow[4137:10703] * Assertion failure in
-[ZBarReaderViewController setSourceType:], /Users/spadix/zbar/hg/sdk/iphone/ZBarReaderViewController.m:650
2012-05-28 17:23:03.626 Wow[4137:10703] * Terminating app due to
uncaught exception 'NSInternalInconsistencyException', reason:
'attempt to set unsupported value (1) for sourceType property'
I have google this issue but can't find a solution.Can anybody tell me how to solute this issue?Dose version 1.2 only support UIImagePickerControllerSourceTypeCamera?Dose the source witch I download is bad?
Thanks.

Answer 1

Basically present the standard iOS media view controller if you want to choose a saved image. After the user has selected an image from the standard iOS media controller, you instantiate a copy of ZBarImageScanner to scan the image. If this makes sense, skip to step 5 to see how I scan a UIImage using ZBarImageScanner. Otherwise, try and follow along the steps below. Hope this helps.
First show the user an alert with options.
UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:#"" delegate:self
cancelButtonTitle:#"Cancel" destructiveButtonTitle:nil otherButtonTitles:#"Camera", #"Camera Roll", #"Photo Library", nil];
[sheet showInView:self.view];
On selection,
- (void)actionSheet:(UIActionSheet *)actionSheet willDismissWithButtonIndex:(NSInteger)buttonIndex {
UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
switch (buttonIndex) {
case 0: sourceType = UIImagePickerControllerSourceTypeCamera; break;
case 1: sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; break;
case 2: sourceType = UIImagePickerControllerSourceTypePhotoLibrary; break;
default: break;
}
if ( buttonIndex <= 2 ) {
[self presentBarcodeReader:sourceType];
}
}
if and only if the sourceType == UIImagePickerControllerSourceTypeCamera do you use ZBar to present the image capture interface.
- (void)presentBarcodeReader:(UIImagePickerControllerSourceType)sourceType {
if ( sourceType == UIImagePickerControllerSourceTypeCamera ) {
ZBarReaderViewController *reader = [ZBarReaderViewController new];
reader.readerDelegate = self;
reader.showsZBarControls = YES;
reader.supportedOrientationsMask = ZBarOrientationMaskAll;
ZBarImageScanner *scanner = reader.scanner;
[scanner setSymbology: ZBAR_I25
config: ZBAR_CFG_ENABLE
to: 0];
[self presentModalViewController:reader animated:YES];
} else {
UIImagePickerController *mediaUI = [[UIImagePickerController alloc] init];
mediaUI.sourceType = sourceType;
mediaUI.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
mediaUI.allowsEditing = NO;
mediaUI.delegate = self;
[self presentModalViewController:mediaUI animated:YES];
}
}
a couple ways we can detect which media picker was used
- (void)imagePickerController:(UIImagePickerController*)reader didFinishPickingMediaWithInfo:(NSDictionary*)info {
id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
if ( results ) {
ZBarSymbol *symbol = nil;
for (symbol in results) break;
[reader dismissViewControllerAnimated:YES completion:^{
[self partLookup:symbol.data];
}];
} else {
UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage] ? [info objectForKey:UIImagePickerControllerEditedImage] : [info objectForKey:UIImagePickerControllerOriginalImage];
[self scanImage:image];
}
}
and the juicy part
- (void)scanImage:(UIImage*)image {
ZBarImage *zImage = [[ZBarImage alloc] initWithCGImage:image.CGImage];
ZBarImageScanner *scanner = [[ZBarImageScanner alloc] init];
[scanner setSymbology: ZBAR_I25
config: ZBAR_CFG_ENABLE
to: 0];
[scanner scanImage:zImage];
ZBarSymbolSet *set = [scanner results];
for (ZBarSymbol *symbol in set) {
NSLog(#"%#", symbol.data);
// process symbol.data however you please.
}
}