为上传的内容（Google Drive、iOS）提供了无效的 MIME 类型答案

【问题标题】：Invalid MIME type provided for the uploaded content (Google Drive, iOS)为上传的内容（Google Drive、iOS）提供了无效的 MIME 类型
【发布时间】：2016-09-26 04:14:27
【问题描述】：

我正在尝试使用files.insert 在 Google 云端硬盘中创建一个 CSV 文件。不幸的是，我遇到了 2 个问题。请帮我解决它。

我的项目信息：

语言：Objective-C
Pod：GoogleAPIClientForREST/Drive

1/ 我在框架中找不到files.insert。所以，我使用files.create。我说的对吗？

接受的媒体 MIME 类型：*/*

当我使用 mimeType:'text/csv' 时它工作正常。但它看起来像这样：

而且，我需要这样的东西来确保客户要求和易于编辑

所以，我将 mimeType 更改为“application/vnd.google-apps.spreadsheet”。这让我犯了一个错误：

An error occurred: Error Domain=com.google.GTLRErrorObjectDomain Code=400 "(Invalid MIME type provided for the uploaded content.)" UserInfo={error=Invalid MIME type provided for the uploaded content., GTLRStructuredError=GTLRErrorObject 0x7fc77c808840: {message:"Invalid MIME type provided for the uploaded content." errors:[1] code:400}, NSLocalizedFailureReason=(Invalid MIME type provided for the uploaded content.)}

这是我的代码：

GTLRDrive_File *metadata = [GTLRDrive_File object];
metadata.name = @"export.csv";
NSString *content = @"a,b,c\nx,y,z";
NSData *data = [content dataUsingEncoding:NSUTF8StringEncoding];
GTLRUploadParameters *uploadParameters = [GTLRUploadParameters uploadParametersWithData:data MIMEType:@"application/vnd.google-apps.spreadsheet"];

GTLRDriveQuery_FilesCreate *query = [GTLRDriveQuery_FilesCreate queryWithObject:metadata
                                                   uploadParameters:uploadParameters];

[self.service executeQuery:query completionHandler:^(GTLRServiceTicket *ticket,
                                                     GTLRDrive_File *updatedFile,
                                                     NSError *error) {
}];

此代码有时可以与我的谷歌帐户一起使用，并且 GTLRDriveQuery_FilesUpdate 运行良好！

File GTLRDrive_File 0x7fee0587b970: {mimeType:"application/vnd.google-apps.spreadsheet" id:"..." kind:"drive#file" name:"export.csv"}

【问题讨论】：

对不起，我的语言能力有限

标签： ios objective-c csv google-drive-api

【解决方案1】：

对我有用的是在上传参数中设置“源”mime 类型，并在文件对象中设置“目标”mime 类型：

NSData *data = [csv dataUsingEncoding: NSUTF8StringEncoding];
NSString *mimeType = @"text/csv";
NSString *convertToMimeType = @"application/vnd.google-apps.spreadsheet";


GTLRDrive_File *newFile = [GTLRDrive_File object];
newFile.name = fileName;
if (convertToMimeType != nil) newFile.mimeType = convertToMimeType;
if (parentItem != nil) newFile.parents = [NSArray arrayWithObject: parentItem.identifier];
GTLRUploadParameters *uploadParameters = [GTLRUploadParameters uploadParametersWithData: data MIMEType: mimeType];
GTLRDriveQuery_FilesCreate *query = [GTLRDriveQuery_FilesCreate queryWithObject: newFile uploadParameters: uploadParameters];

【讨论】：

【解决方案2】：

我找到了问题的答案。

在这种情况下，我应该调用 GTLRDriveQuery_FilesCreate 且 uploadParameters 为 nil 以创建“application/vnd.google-apps.spreadsheet”。

GTLRDriveQuery_FilesCreate *query = [GTLRDriveQuery_FilesCreate queryWithObject:metadata uploadParameters:nil];

之后，我将使用文件标识符调用 GTLRDriveQuery_FilesUpdate 并将新数据上传到我的新文件中。

这是我的代码：

- (void)createCSVFileWithRealm {
GTLRDrive_File *metadata = [GTLRDrive_File object];
metadata.name = @"export.csv";
metadata.mimeType = @"application/vnd.google-apps.spreadsheet";

GTLRDriveQuery_FilesCreate *query = [GTLRDriveQuery_FilesCreate queryWithObject:metadata
                                                               uploadParameters:nil];

[self.service executeQuery:query completionHandler:^(GTLRServiceTicket *ticket,
                                                     GTLRDrive_File *updatedFile,
                                                     NSError *error) {
    if (error == nil) {
        // Save id and call upload data
    }
}];

}

- (void)uploadData {
GTLRDrive_File *metadata = [GTLRDrive_File object];

NSString *content = @"a,b,c\nx,y,z";
NSData *data = [content dataUsingEncoding:NSUTF8StringEncoding];
GTLRUploadParameters *uploadParameters = [GTLRUploadParameters uploadParametersWithData:data MIMEType:@"application/vnd.google-apps.spreadsheet"];
GTLRDriveQuery_FilesUpdate *query = [GTLRDriveQuery_FilesUpdate queryWithObject:metadata
                                                             fileId:exportFile.identifier
                                                   uploadParameters:uploadParameters];

[self.service executeQuery:query completionHandler:^(GTLRServiceTicket *ticket,
                                                     GTLRDrive_File *updatedFile,
                                                     NSError *error) {
    if (error == nil) {
        NSLog(@"File %@", updatedFile);
    } else {
        NSLog(@"An error occurred: %@", error);
    }
}];

}

【讨论】：