目前,我正在使用以下代码上传视频:
NSURLRequest *urlRequest = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:[[entity uploadUrl]absoluteString] parameters:entity.params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
[UploadModel getAssetData:entity.asset resultHandler:^(NSData *filedata) {
NSString *mimeType =[FileHelper mimeTypeForFileAtUrl:entity.fileUrl];
// NSError *fileappenderror;
[formData appendPartWithFileData:filedata name:@"data" fileName: entity.filename mimeType:mimeType];
}];
} error:&urlRequestError];
GetAssetData方法
+(void)getAssetData: (PHAsset*)mPhasset resultHandler:(void(^)(NSData *imageData))dataResponse{
PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
options.version = PHVideoRequestOptionsVersionOriginal;
[[PHImageManager defaultManager] requestAVAssetForVideo:mPhasset options:options resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
if ([asset isKindOfClass:[AVURLAsset class]]) {
NSURL *localVideoUrl = [(AVURLAsset *)asset URL];
NSData *videoData= [NSData dataWithContentsOfURL:localVideoUrl];
dataResponse(videoData);
}
}];
}
这种方法存在的问题是,每当上传大/多个视频文件时,应用程序就会耗尽内存。我想这是由于请求NSDATA(aka
filedata
)上传文件(请参见上面的方法)。我尝试使用方法请求文件路径appendPartWithFileURL
的appendPartWithFileData
接口(interface)它可以在模拟器上运行。并在实际设备上失败,并显示错误消息,即无法通过指定的路径读取文件。我已经在这里描述了这个问题
PHAsset + AFNetworking. Unable to upload files to the server on a real device
======================================
更新:我已经修改了我的代码,以测试通过新iPhone 6s +上的本地路径上传文件的方法,如下所示
NSURLRequest *urlRequest = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:[[entity uploadUrl]absoluteString] parameters:entity.params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
NSString *mimeType =[FileHelper mimeTypeForFileAtUrl:entity.fileUrl];
NSError *fileappenderror;
[formData appendPartWithFileURL:entity.fileUrl name:@"data" fileName:entity.filename mimeType:mimeType error:&fileappenderror];
if (fileappenderror) {
[Sys MyLog: [NSString stringWithFormat:@"Failed to append: %@", [fileappenderror localizedDescription] ] ];
}
} error:&urlRequestError];
在iPhone 6s +上进行测试可提供更清晰的日志警告,它是由于调用
appendPartWithFileURL
方法而导致的 <Warning>: my_log: Failed to append file: The operation couldn’t be completed. File URL not reachable.
deny(1) file-read-metadata /private/var/mobile/Media/DCIM/100APPLE/IMG_0008.MOV
15:41:25 iPhone-6s kernel[0] <Notice>: Sandbox: My_App(396) deny(1) file-read-metadata /private/var/mobile/Media/DCIM/100APPLE/IMG_0008.MOV
15:41:25 iPhone-6s My_App[396] <Warning>: my_log: Failed to append file: The file “IMG_0008.MOV” couldn’t be opened because you don’t have permission to view it.
这是用于从PHAsset获取本地文件路径的代码
if (mPhasset.mediaType == PHAssetMediaTypeImage) {
PHContentEditingInputRequestOptions * options = [[PHContentEditingInputRequestOptions alloc]init];
options.canHandleAdjustmentData = ^BOOL(PHAdjustmentData *adjustmeta){
return YES;
};
[mPhasset requestContentEditingInputWithOptions:options completionHandler:^(PHContentEditingInput * _Nullable contentEditingInput, NSDictionary * _Nonnull info) {
dataResponse(contentEditingInput.fullSizeImageURL);
}];
}else if(mPhasset.mediaType == PHAssetMediaTypeVideo){
PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
options.version = PHVideoRequestOptionsVersionOriginal;
[[PHImageManager defaultManager] requestAVAssetForVideo:mPhasset options:options resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
if ([asset isKindOfClass:[AVURLAsset class]]) {
NSURL *localVideoUrl = [(AVURLAsset *)asset URL];
dataResponse(localVideoUrl);
}
}];
}
因此问题仍然存在-上传到服务器的文件为空
最佳答案
上面提出的解决方案仅部分正确(这是我自己之前发现的)。由于系统不允许读取沙箱外部的文件,因此无法通过文件路径访问(读取/写入)文件,而只能复制文件。在iOS 9及更高版本中,Photos Framework提供了API(无法通过NSFileManager来完成,而只能使用Photos框架api)将文件复制到应用的沙箱目录中。这是我在研究文档和头文件后使用的代码。
首先,将文件复制到应用程序沙箱目录。
// Assuming PHAsset has only one resource file.
PHAssetResource * resource = [[PHAssetResource assetResourcesForAsset:myPhasset] firstObject];
+(void)writeResourceToTmp: (PHAssetResource*)resource pathCallback: (void(^)(NSURL*localUrl))pathCallback {
// Get Asset Resource. Take first resource object. since it's only the one image.
NSString *filename = resource.originalFilename;
NSString *pathToWrite = [NSTemporaryDirectory() stringByAppendingString:filename];
NSURL *localpath = [NSURL fileURLWithPath:pathToWrite];
PHAssetResourceRequestOptions *options = [PHAssetResourceRequestOptions new];
options.networkAccessAllowed = YES;
[[PHAssetResourceManager defaultManager] writeDataForAssetResource:resource toFile:localpath options:options completionHandler:^(NSError * _Nullable error) {
if (error) {
[Sys MyLog: [NSString stringWithFormat:@"Failed to write a resource: %@",[error localizedDescription]]];
}
pathCallback(localpath);
}];
} // Write Resource into Tmp
上传任务本身
NSURLRequest *urlRequest = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST"
URLString:[[entity uploadUrl]absoluteString] parameters:entity.params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
// Assuming PHAsset has only one resource file.
PHAssetResource * resource = [[PHAssetResource assetResourcesForAsset:myPhasset] firstObject];
[FileHelper writeResourceToTmp:resource pathCallback:^(NSURL *localUrl)
{
[formData appendPartWithFileURL: localUrl name:@"data" fileName:entity.filename mimeType:mimeType error:&fileappenderror];
}]; // writeResourceToTmp
}// End Url Request
AFHTTPRequestOperation * operation = [[AFHTTPRequestOperation alloc ] initWithRequest:urlRequest];
//.....
// Further steps are described in the AFNetworking Docs
此上载方法有一个很大的缺点..如果设备进入“ sleep 模式”,您会很费劲。因此,此处推荐的上载方法是使用method。
uploadTaskWithRequest:fromFile:progress:completionHandler
中的AFURLSessionManager.
对于iOS 9以下的版本。如果是图像,您可以按照问题代码中的说明从
NSDATA
提取PHAsset
并上传。或先将其写入应用沙箱存储,然后再上传。在大文件的情况下,此方法不可用。另外,您可能希望使用“图像/视频选择器”将文件导出为ALAsset
。 ALAsset
提供了api,它允许您从存储中读取文件。但是在上传之前,您必须将其写入沙盒存储中。