通过电子邮件在文档目录中导出 SQLite 文件

Posted 2023-03-12

【中文标题】通过电子邮件在文档目录中导出 SQLite 文件

【英文标题】：Export SQLite file in document directory via email

【发布时间】：2015-02-25 05:29:37

【问题描述】：

当用户点击 exportAllData 按钮时，我正在尝试通过位于文档目录中的电子邮件导出 SQLite 文件。使用下面的代码，我能够打开邮件应用程序并附加一个文件。但是，当我发送它时，文件不会随电子邮件一起发送。

- (IBAction)exportAllDataButtonPressed:(id)sender

    MFMailComposeViewController *composer=[[MFMailComposeViewController alloc]init];
    composer.mailComposeDelegate = self;
    if ([MFMailComposeViewController canSendMail])
    
    [composer setToRecipients:[NSArray arrayWithObjects:@"[e-mail]",nil]];
    [composer setSubject:@"SQLite File"];
    [composer setMessageBody:@"This is your SQLite file" ishtml:NO];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);

    NSString *documentDirectory = [paths objectAtIndex:0];
    NSString *path = [documentDirectory stringByAppendingPathComponent:@"mooddb.sql"];
    NSData *myData = [NSData dataWithContentsOfFile:path];

    [composer addAttachmentData:myData mimeType:@"application/x-sqlite3" fileName:path];
    [self presentViewController:composer animated:YES completion:nil];
    

【问题讨论】：

请检查我的数据，当您发送时可能是 nil...???

它工作了吗？我得到空数据。请在此处查看我的问题***.com/q/56151110/1635315。

【参考方案1】：

[composer addAttachmentData:myData mimeType:@"application/x-sqlite3" fileName:path]; 

在 FileName 中，您正在发送路径... 所以请检查文件名的路径.. 喜欢..

[composer addAttachmentData:myData mimeType:@"application/x-sqlite3" fileName:@"mooddb.sql"];  

【讨论】：

这只是改变文件名。

【参考方案2】：

原来我在错误的目录中搜索。

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);

应该是：

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

【参考方案3】：

Swift 版本

@IBAction func exportAllDataButtonTapped(_ sender: Any) 

    guard MFMailComposeViewController.canSendMail() == true else  return 

    let mailCompose = MFMailComposeViewController()
    mailCompose.mailComposeDelegate = self
    mailCompose.setSubject("Sqlite File")
    mailCompose.setMessageBody("", isHTML: false)

    if let documentsPathURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first 
        let fileName = "myDatabase.sqlite"
        let fullURL = documentsPathURL.appendingPathComponent(fileName)
        if let data = try? Data(contentsOf: fullURL) 
            mailCompose.addAttachmentData(data, mimeType: "application/x-sqlite3", fileName: fileName)
        
    

    present(mailCompose, animated: true, completion: nil)