如何从谷歌驱动器使用目标C部分下载文件？

Karl Doenitz 发表于 Dev

卡尔·多尼兹

我想从google驱动器使用目标下载一个大文件，并使用google-api-objectivec-client-read-lib。但是当我下载大文件时，我看到了内存的增长。例如，文件大小为589M，程序的内存超过600M。因此，我想从Google驱动器中部分下载文件。我的代码：

-(void)getFileMetadataWithService:(NSString *)fileId
{
    GTLQuery *query = [GTLQueryDrive queryForFilesGetWithFileId:fileId];
    [service executeQuery:query
        completionHandler:^(GTLServiceTicket *ticket, GTLDriveFile *file,
                            NSError *error) {
            if (error == nil) {
                NSLog(@"Title: %@", file.title);
                NSLog(@"Description: %@", file.descriptionProperty);
                NSLog(@"MIME type: %@", file.mimeType);
                NSLog(@"download url:%@",file.downloadUrl);
                NSLog(@"export link:%@",file.exportLinks);
                [self downloadFileContentWithService:@"example"
                                                file:file];
            } else {
                NSLog(@"An error occurred: %@", error);
            }
        }];
}


-(void)downloadFileContentWithService:(NSString *)loaclpath
                                 file:(GTLDriveFile *)file
{
    NSLog(@"download file");
    if (file.downloadUrl != nil)
    {
        NSLog(@"begin download");
        GTMHTTPFetcher *fetcher =[service.fetcherService fetcherWithURLString:file.downloadUrl];
        [fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error) {
            if (error == nil) {
                [data writeToFile:@"/Users/mycomputer/Desktop/a.mov" atomically:YES];
                [data writeToFile:@"/Users/mycomputer/Desktop/b.mov" atomically:YES];
                [data writeToFile:@"/Users/mycomputer/Desktop/c.mov" atomically:YES];
                NSLog(@"download ok");
            } else {
                NSLog(@"An error occurred: %@", error);
            }
        }];
    }
    else
    {

    }
}

如何修改从Google驱动器部分下载文件的方法？

卡尔·多尼兹

好，我把它修好。这很容易。我将代码修改为：

-(void)downloadFileContentWithService:(NSString *)loaclpath
                                 file:(GTLDriveFile *)file
{
    NSLog(@"download file");
    if (file.downloadUrl != nil)
    {
        NSLog(@"begin download");
        GTMHTTPFetcher *fetcher =[service.fetcherService fetcherWithURLString:file.downloadUrl];
        fetcher.downloadPath = @"/Users/KarlDoenitz/Desktop/download/bisaishipin.mov";
        [fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error) {
            if (error == nil) {
                NSLog(@"download ok");
            } else {
                NSLog(@"An error occurred: %@", error);
            }
        }];
    }
    else
    {

    }
}