ios - iOS 7-生成的CSV文件未正确附加到电子邮件

Question

抱歉，标题令人困惑。我有一个具有数据库的应用程序。我想我能够将数据库表导出为csv文件。但是，我在附加发送文件时遇到困难。每当我检查yahoo邮件时，都会显示回形针，告诉我有一个附件。但是，当我打开邮件时，邮件中没有文件。

这是我创建csv文件的功能:

- (IBAction)saveToCSV:(id)sender {

    NSArray  *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docsPath = [paths objectAtIndex:0];
    NSString *dbPath = [docsPath stringByAppendingPathComponent:@"itemList.db"];

    FMDatabase *database = [FMDatabase databaseWithPath:dbPath];
    [database open];

    FMResultSet *results = [database executeQuery:@"SELECT * FROM OrderList"];

    //CHCSVWriter *csvWriter = [[CHCSVWriter alloc] initWithCSVFile:@"/csvFile/" atomic:NO];
    CHCSVWriter *csvWriter = [[CHCSVWriter alloc] initForWritingToCSVFile:@"/Orderlist.csv"];

    while([results next]) {
        NSDictionary *resultRow = [results resultDictionary];
        NSArray *orderedKeys = [[resultRow allKeys] sortedArrayUsingSelector:@selector(compare:)];
        //iterate over the dictionary
        for (NSString *columnName in orderedKeys) {
            id value = [resultRow objectForKey:columnName];
            [csvWriter writeField:value];
        }
        [csvWriter finishLine];
    }
    [csvWriter closeStream];
    //[csvWriter release];

    [database close];

    NSLog(@"csv completed");
    [self sendEmail];

}

这是我的sendEmail函数

- (void) sendEmail{
    if ([MFMailComposeViewController canSendMail]) {
        NSArray *sendTo = [NSArray arrayWithObject:@"My Name <myemail@yahoo.com>"];
        MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init];
        mailViewController.mailComposeDelegate = self;
        [mailViewController setSubject:@"Order CSV."];
        [mailViewController setMessageBody:@"Your message goes here." isHTML:NO];
        [mailViewController setToRecipients:sendTo];
        [mailViewController addAttachmentData:[NSData dataWithContentsOfFile:@"/Orderlist.csv"]
                                     mimeType:@"text/csv"
                                     fileName:@"Orderlist.csv"];


        [self presentModalViewController:mailViewController animated:YES];

    }
    else {
        NSLog(@"Device is unable to send email in its current state.");
        UIAlertView *message = [[UIAlertView alloc]
                                initWithTitle:@"Failed to Send Mail!"
                                message:@"Please make sure that you have logged in to the Mail."
                                delegate:nil
                                cancelButtonTitle:@"OK"
                                otherButtonTitles:nil];

        [message show];

    }
}

我尝试更改文件路径和文件名，但无济于事。

有任何想法吗？

Answer 1

看起来您正在将CSV文件(或认为自己)写入了您无权访问的路径，即root。

iOS应用已沙箱化，您只能写入某些目录，因此，在这种情况下，应将csv文件写入缓存目录中的某个位置。

更改

CHCSVWriter *csvWriter = [[CHCSVWriter alloc] initForWritingToCSVFile:@"/Orderlist.csv"];

至

NSString *csvPath = [docsPath stringByAppendingPathComponent:@"Orderlist.csv"];
CHCSVWriter *csvWriter = [[CHCSVWriter alloc] initForWritingToCSVFile:csvPath];

并改变

[mailViewController addAttachmentData:[NSData dataWithContentsOfFile:@"/Orderlist.csv"]
                                 mimeType:@"text/csv"
                                 fileName:@"Orderlist.csv"];

至

NSArray  *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docsPath = [paths objectAtIndex:0];
NSString *csvPath = [docsPath stringByAppendingPathComponent:@"Orderlist.csv"];
[mailViewController addAttachmentData:[NSData dataWithContentsOfFile:csvPath]
                                 mimeType:@"text/csv"
                                 fileName:@"Orderlist.csv"];