小编Sur*_*esh的帖子

使用CoreBluetooth我想将数据从iPhone发送到Mac.为此,我编写了像iPhone一样的代码作为'Peripheral'和Mac作为'Central'.

它工作得很好,但有时会直接断开连接,然后连续连接和断开连接.

有时当它试图重新连接时,在中心它直接调用'didDisconnectPeripheral'委托方法.但有时它在'didUpdateNotificationStateForCharacteristic'中有错误"句柄无效".

我在网上提到了所有的链接.但我无法解决这个问题.我在iPhone中认为它存储了蓝牙缓存.

请提出解决方法如何解决"句柄无效"错误？

以下是一些重要的方法.

对于Peripheral,我写了如下代码.

在Appdelegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.peripheral = [[PeripheralServerObject alloc] init];
self.peripheral.serviceUUID = [CBUUID UUIDWithString:@"4w24"];
return YES;
}

在外围对象文件中:

//To Check Bluetooth State
- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral {
    switch (peripheral.state) {
        case CBPeripheralManagerStatePoweredOn:
            [self enableService];
            break;
        case CBPeripheralManagerStatePoweredOff: {
            [self disableService];
            break;
        }
}

// To Add characteristics to Service
- (void)enableService
{
[self.peripheral removeAllServices];
 self.service = [[CBMutableService alloc]
                    initWithType:self.serviceUUID primary:YES];

self.authChar =
        [[CBMutableCharacteristic alloc] initWithType:[CBUUID UUIDWithString:@"a86e"]
                                           properties:CBCharacteristicPropertyNotify
                                                value:nil
                                          permissions:CBAttributePermissionsReadable];


self.respChar =
        [[CBMutableCharacteristic …

我使用下面的代码来压缩视频.

- (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL
                                   outputURL:(NSURL*)outputURL
                                     handler:(void (^)(AVAssetExportSession*))handler
{

    [[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetMediumQuality];
    exportSession.outputURL = outputURL;
    exportSession.outputFileType = AVFileTypeQuickTimeMovie;

    [exportSession exportAsynchronouslyWithCompletionHandler:^(void)
     {

         if (exportSession.status == AVAssetExportSessionStatusCompleted)
         {

             printf("completed\n");
             NSLog(@"outputurl is %@",outputURL);

         }
         else
         {
             printf("error\n");
             NSLog(@"error is %@",exportSession.error);

         }

     }];

}

在压缩后,视频在iOS6中的声音非常低,但在iOS 5中我获得了完整的原始音量,那么我如何在iOS 6中获得原始音量.

我正在[info objectForKey:UIImagePickerControllerMediaURL]从UIImagepickercontroller的didFinishPickingMediaWithInfo方法获得输入.

NSURL *inputURL = [NSURL URLWithString:inputurlstring];

我从这段代码中给出了outputurl

        NSString  *documentsDirectory = [paths objectAtIndex:0];
        NSString *videoPath = [NSString stringWithFormat:@"%@/%@", documentsDirectory,@"capturedvideo.MOV"];
        NSURL *outputURL = [NSURL fileURLWithPath:videoPath];

我使用以下代码来获得低质量的视频

 - (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL 
    outputURL:(NSURL*)outputURL 
    handler:(void (^)(AVAssetExportSession*))handler 
    { 

    [[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil]; 
    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil]; 
    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetLowQuality]; 
    exportSession.outputURL = outputURL; 
    exportSession.outputFileType = AVFileTypeQuickTimeMovie; 

    [exportSession exportAsynchronouslyWithCompletionHandler:^(void) 
    { 
    if (exportSession.status == AVAssetExportSessionStatusCompleted) 
    { 
    printf("completed\n"); 

    } 
    else 
    { 
    printf("error\n"); 
    NSLog(@"error is %@",exportSession.error); 

    } 

    }]; 
}           

我只使用大文件时出现以下错误.因为当我使用小尺寸视频文件时,我没有收到任何错误.

Error Domain=NSURLErrorDomain …