Google Drive API - 使用Objective-C在特定文件夹中列出特定文件 [英] Google Drive API - list specific files in a specific folder using Objective-C

问题描述

我正在研究iOS版Google云端硬盘集成，并且遇到了一些问题 - 我需要检查文件夹中是否存在文件，但无论如何我都会收到500内部错误响应我似乎把这个要求放在一起。我认为这应该是合法的：

  // self.directoryDriveFile.identifier是在前一个请求中检索的有效文件夹标识
 GTLQueryDrive * query = [GTLQueryDrive queryForChildrenListWithFolderId：self.directoryDriveFile.identifier]; 
 
 //添加查询以指定我们感兴趣的文件（在Java版本中工作...）
 query.q = [NSString stringWithFormat：@title ='％@'和trashed = false，
 ZTCloudSyncLockFileName]; 
 //在调试器中停止显示query.q：title ='sync.lock'和trashed = false 
 
 //发出请求
 [self.driveService executeQuery：query 
 completionHandler：^（GTLServiceTicket * ticket，
 GTLDriveFileList * files，
 NSError * error）{
 if（error == nil）{
 if（[files.items count]> 0）{
 self.foundLockfile = YES; 
} else {
 self.foundLockfile = NO; 
 
}其他{
 DLog（@加载锁定文件请求时发生错误：％@，错误）; 
 [self bailWithError：error performCleanup：NO]; 
} 
}]; 
  

当执行查询时，它总是以错误结尾，并带有以下不幸的稀疏错误信息：

 错误域= com.google.GTLJSONRPC 
 ErrorDomain代码= 500无法完成操作。（内部错误）
 UserInfo = 0x99c4660 {
 error =内部错误，
 GTLStructuredError = GTLErrorObject 0x99c4360：{
 message：内部错误代码：500 data：[1]} ，
 NSLocalizedFailureReason =（内部错误）} 
  

我也尝试了以下更基本的查询，指定一个父母子句，但我最后得到上面显示的同样不幸的备用错误对象：

  GTLQueryDrive * altQuery = [GTLQueryDrive queryForFilesList]; 
 altQuery.q = [NSString stringWithFormat：@title ='％@'和trashed = false以及父母中的'％@'，
 ZTCloudSyncLockFileName，
 self.directoryDriveFile.identifier]; 
  

这也应该有效，但也会产生500个错误。

---

其他信息：在此过程中测试以下内容：

• 检查目录中的文件夹root-OK


• 在目录root-OK中创建文件夹
  
• 检查目录中的名为sync.lock的文件root- OK

解决方案

   - （void）fetchGoogleDriveFileListWithfolderId :( NSString *）folderId 
：（void（^）（NSMutableArray *，NSError *））completionBlock 
 {
 GTLQueryDrive * query = [GTLQueryDrive queryForFilesList]; 
 query.q = [NSString stringWithFormat：@''％@'在父母和trashed = false，folderId]; 
 
 GTLServiceTicket * ticketListing = [self.driveService 
 executeQuery：query completionHandler：^（GTLServiceTicket * ticket，GTLDriveFileList * files，NSError * error）
 {
 NSMutableArray * mainArray = [[NSMutableArray alloc] init]; 
 
 if（error == nil）
 {
 completionBlock（files.items，nill）; 
} 
 else 
 {
 NSLog（@An error occurred：％@，error）; 
 completionBlock（nil，error）; 
} 
}]; 
} 
  

您可以使用上述方法获取文件夹内容。
这里folderId是
$ b $ ul
$ root $（主驱动器）

sharedWithMe对于共享文件夹

GTLDrivefile标识符值

I'm working on a Google Drive integration for iOS and I've hit a snag—I need to check for the existence of a file in a folder, but I keep getting a "500 Internal Error" response no matter how I seem to put together the request. I think this should be legit:

// self.directoryDriveFile.identifier is a valid folder identifier retrieved on previous request
GTLQueryDrive *query = [GTLQueryDrive queryForChildrenListWithFolderId:self.directoryDriveFile.identifier];

// add query to specify the file we're interested in (works in Java version...)
query.q = [NSString stringWithFormat:@"title='%@' and trashed=false",
           ZTCloudSyncLockFileName];
// stopping in debugger shows query.q: title='sync.lock' and trashed=false

// fire off request
[self.driveService executeQuery:query
              completionHandler:^(GTLServiceTicket *ticket,
                                  GTLDriveFileList *files,
                                  NSError *error) {
                  if (error == nil) {
                      if ([files.items count] > 0) {
                          self.foundLockfile = YES;
                      } else {
                          self.foundLockfile = NO;
                      }
                  } else {
                      DLog(@"An error occurred loading lockfile request: %@", error);
                      [self bailWithError:error performCleanup:NO];
                  }
              }];

When the query is executed, it always ends up in error, with the following unfortunately sparse error information:

Error Domain=com.google.GTLJSONRPC
ErrorDomain Code=500 "The operation couldn’t be completed. (Internal Error)" 
UserInfo=0x99c4660 {
  error=Internal Error, 
  GTLStructuredError=GTLErrorObject 0x99c4360: {
  message:"Internal Error" code:500 data:[1]}, 
  NSLocalizedFailureReason=(Internal Error)}

I've also tried the following more basic query, specifying a parents clause, but I end up with the same unfortunately spare error object shown above:

GTLQueryDrive *altQuery = [GTLQueryDrive queryForFilesList];
altQuery.q = [NSString stringWithFormat:@"title='%@' and trashed=false and '%@' in parents",
              ZTCloudSyncLockFileName,
              self.directoryDriveFile.identifier];

That, too, should work, but also produces a 500 error.

---

Additional information: tested the following while working on this:

• Check for folder in directory root—OK
• Create folder in directory root—OK
• Check for file named sync.lock in directory root—OK

解决方案

-(void)fetchGoogleDriveFileListWithfolderId:(NSString *)folderId
    :(void (^)(NSMutableArray *, NSError*))completionBlock
{
    GTLQueryDrive *query = [GTLQueryDrive queryForFilesList];
    query.q =[NSString stringWithFormat:@"'%@' in parents and trashed=false", folderId];

    GTLServiceTicket *ticketListing = [self.driveService
        executeQuery:query completionHandler:^(GTLServiceTicket *ticket,GTLDriveFileList *files, NSError *error)
    {
        NSMutableArray *mainArray=[[NSMutableArray alloc]init];

        if (error == nil)
        {
            completionBlock(files.items,nill);
        }
        else
        {
            NSLog(@"An error occurred: %@", error);
            completionBlock(nil,error);
        }
    }];
}

You can use above method for fetch the folder contents. Here folderId is

• "root" (Main Drive)
• "sharedWithMe" for shared folder
• GTLDrivefile identifier value

这篇关于Google Drive API - 使用Objective-C在特定文件夹中列出特定文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！