ios - 使用 sendResourceAtURL 给出 "Unsupported resource type"

Question

我正在尝试使用 sendResourceAtURL 发送我通过 imagePickerController 选择的图像。我在方法 didFinishPickingMediaWithInfo 中得到 URL 作为

NSURL *refURL = [info objectForKey:UIImagePickerControllerReferenceURL];

但是当我打电话的时候

[self.mySession sendResourceAtURL:refURL withName:@"test" toPeer:peerid withCompletionHandler:^(NSError *error){
                if (error)....

我总是收到不受支持的资源类型错误。我相信 url 的构造不正确，我还需要其他东西。当我在我的包中创建一个带有本地文件的 url 时，它可以正常传输。有什么想法吗？

谢谢，佐伊斯

Answer 1

我使用了 Multipeer Group Chat 示例应用程序中提供的代码并且有效。您首先必须将文件写入您的文档目录，然后发送该 url。

// Don't block the UI when writing the image to documents
dispatch_async(dispatch_get_global_queue(0, 0), ^{
    // We only handle a still image
    UIImage *imageToSave = (UIImage *)[info objectForKey:UIImagePickerControllerOriginalImage];

    // Save the new image to the documents directory
    NSData *pngData = UIImageJPEGRepresentation(imageToSave, 1.0);

    // Create a unique file name
    NSDateFormatter *inFormat = [NSDateFormatter new];
    [inFormat setDateFormat:@"yyMMdd-HHmmss"];
    NSString *imageName = [NSString stringWithFormat:@"image-%@.JPG", [inFormat stringFromDate:[NSDate date]]];
    // Create a file path to our documents directory
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:imageName];
    [pngData writeToFile:filePath atomically:YES]; // Write the file
    // Get a URL for this file resource
    NSURL *imageUrl = [NSURL fileURLWithPath:filePath];

    MCPeerID *peer = self.session.connectedPeers[0];
    [self.session sendResourceAtURL:imageUrl withName:imageName toPeer:peer withCompletionHandler:^(NSError *error) {
        if (error) {
            NSLog(@"Failed to send picture to %@, %@", peer.displayName, error.localizedDescription);
            return;
        }
        NSLog(@"Sent picture to %@", peer.displayName);
        //Clean up the temp file
        NSFileManager *fileManager = [NSFileManager defaultManager];
        [fileManager removeItemAtURL:imageUrl error:nil];
    }];
});