Question

我有一个基于沙盒的基于Document的Mac应用程序。我的文档将图像合并到用户计算机上我想将文档范围的书签保存到我的文档中使用的图像，以便在关闭并重新打开文档时可以访问该图像。

以下是我创建书签的方法：

 //path is path to an image
 //for a new document docUrl is set to the location where we will save our document
 NSURL * pathUrl = [NSURL fileURLWithPath:path];
 NSError * error;
 NSData * pathBookmarkData = [pathUrl bookmarkDataWithOptions:
                              (NSURLBookmarkCreationWithSecurityScope 
                             | NSURLBookmarkCreationSecurityScopeAllowOnlyReadAccess)
                              includingResourceValuesForKeys:[NSArray arrayWithObject:NSURLPathKey] 
                             relativeToURL:docUrl error:&error];

这导致以下错误：

Error Domain=NSCocoaErrorDomain Code=260 "The file “Untitled.mydocext” couldn’t be opened because there is no such file." (Collection URL points to a file that doesn't exist) UserInfo=0x608000070800 {NSURL=file:///Users/myname/Pictures/Untitled.mydocext, NSDebugDescription=Collection URL points to a file that doesn't exist}

如何创建要保存到新文档的文档范围书签？

以下是我如何获得路径：

NSArray* fileTypes = [[NSArray alloc] initWithObjects:@"png", @"jpg", @"jpeg", @"bmp", @"gif", @"tif", @"tiff", @"PNG", @"JPG", @"JPEG", @"BMP", @"GIF", @"TIF", @"TIFF", nil];

NSOpenPanel *panel;

panel = [NSOpenPanel openPanel];
[panel setTitle:@"Select Photos"];

[panel setFloatingPanel:YES];

[panel setCanChooseDirectories:YES];
[panel setCanChooseFiles:YES];
[panel setAllowsMultipleSelection:YES];
[panel setAllowedFileTypes:fileTypes];

[panel beginWithCompletionHandler:^(NSInteger result){
    if (result == NSFileHandlingPanelOKButton) {
        NSMutableArray * pathsArray = [[NSMutableArray alloc] init];
        NSArray * urlArray = [panel URLs];
        for (NSURL * url in urlArray) {
            //this is how I get path to image, assume I am not selecting directories
            NSString * path = [url path];
        }
    }
}];

Answer 1

无需延迟SSB的创建。转移到路径然后转回URL可能会导致沙箱出现问题。尝试使用以下内容：

    // the URLs come back with access to it. they are added to the sandbox by the panel. no need to do anything like start accessing security scoped.
    NSArray * urlArray = [panel URLs];

    for (NSURL *urlToStore in urlArray) {
        // create a SSB out of the URL
        NSError *erroer = nil;
        NSData *bookmarkData = nil;
        bookmarkData = [urlToStore bookmarkDataWithOptions:(NSURLBookmarkCreationWithSecurityScope| NSURLBookmarkCreationSecurityScopeAllowOnlyReadAccess)
                            includingResourceValuesForKeys:nil
                                             relativeToURL:docUrl
                                                     error:&erroer];
        if (erroer) {
            NSLog(@"couldn't create NSURLBookmarkCreationWithSecurityScope with error: %@", [erroer description]);
        } else if ( bookmarkData ) {
            // store the bookmark data either in the document or internally for later persistency
        } else {
            NSLog(@"no error and no bookmarkData: %@", [self description]);
        }
     }

如何创建要保存到新文档的文档范围书签？

1 个答案: