iPhone:如何在使用ALAssetsLibrary枚举时获取视频文件二进制文件?

时间:2011-04-08 08:42:05

标签: iphone

我正试图通过ALAssetsLibrary访问iPhone的相册库。我成功访问相册并获取设备上每个图像的资产URL。我的测试是,在获得所有图像后,上传到我的网络服务器也运行良好。 我也试图获取视频文件并执行相同的过程,即将视频文件上传到我的服务器。这是问题,我不知道如何访问视频指针二进制文件,就像我使用UIImageJPEGRepresentation为图像做的那样,并发送到我的HTTP代码?

-(void) assetsEmumeration {


void (^assetEnumerator)(struct ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) {
        if(result != NULL) {
            NSLog(@"See Asset: %@", result);
            [assetArray addObject:result];
            // get image url
            NSURL *url = [[result defaultRepresentation] url];
            NSString *urlInStr = [NSString stringWithFormat:@"%@",url];

            NSData *imgData = UIImageJPEGRepresentation ([UIImage imageWithCGImage:[result thumbnail]], 90);

            HttpUpload (imgData);
        }
    };

    void (^assetGroupEnumerator)(struct ALAssetsGroup *, BOOL *) =  ^(ALAssetsGroup *group, BOOL *stop) 
    {

        if(group != nil) {
            [group enumerateAssetsUsingBlock:assetEnumerator];
        }
        [self.activity stopAnimating];
        [self.activity setHidden:YES];
    };
    assetLibrary = [[ALAssetsLibrary alloc] init];
    [assetLibrary enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos
                           usingBlock:assetGroupEnumerator
                         failureBlock: ^(NSError *error) {
                             NSLog(@"Failure: %@", [error localizedDescription]);
                         }];
    assetArray = [[NSMutableArray array] retain]; 

}

有人能遇到这个解决,请指导我!

1 个答案:

答案 0 :(得分:6)

您可以使用ALAssetRepresentation的getBytes:fromOffset:length:error:方法获取原始字节,如下所示:

uint8_t *bytes = malloc([representation size]);
NSError *error = nil;
NSUInteger length = [representation getBytes:bytes fromOffset:0 length:[representation size] error:&error];