Found empty data in sqlite when send via MFMailcomposeController

问题

I am sending SQLite(Coredata sqlite file) file via email but found empty data in all tables in the received mail.

I am using below code:

MFMailComposeViewController *mc = [[MFMailComposeViewController alloc] init];
mc.mailComposeDelegate = self;
[mc setSubject:subject];
[mc setMessageBody:body isHTML:FALSE];
if (attachmentData) {
 [mc addAttachmentData:attachmentData mimeType:fileMimeType fileName:fileName];
}
if (!recipients || recipients.count == 0) {
 recipients = @[];
}
[mc setToRecipients:recipients];
[presentedViewController presentViewController:mc animated:YES completion:nil];

Here, fileMimeType = "application/x-sqlite3" and fileName: xyz.sqlite

Found the same question here, but with no solution. Any idea how to do that?

回答1:

As I indicated in comments, iOS uses SQLite’s WAL mode by default, so you need to include the WAL file as an attachment.

回答2:

Are you sure that you attachmentData isn't nil?
How large is your attachmentData?
How are you constructing your data from the sqlite file?

This test code seemed to work fine for me with sending a simple sample database:

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self sendSampleMailWithDbAttached];
}

- (void)sendSampleMailWithDbAttached {
    MFMailComposeViewController *mc = [[MFMailComposeViewController alloc] init];
    mc.mailComposeDelegate = self;
    [mc setSubject:@"Message Subject"];
    [mc setMessageBody:@"Message Body" isHTML:NO];
    NSString *sqliteFilePath = [self createTestDb];
    NSData *attachmentData = [NSData dataWithContentsOfFile:sqliteFilePath];
    if (attachmentData) {
        [mc addAttachmentData:attachmentData mimeType:@"application/x-sqlite3" fileName:@"xyz.sqlite"];
    }
    [mc setToRecipients:@[@"fake@email.com"]];
    [self presentViewController:mc animated:YES completion:nil];
}

- (NSString *)createTestDb {
    NSString *databasePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]
                              stringByAppendingPathComponent: @"xyz.sqlite"];
    sqlite3 *db;
    if (sqlite3_open([databasePath UTF8String], &db) == SQLITE_OK) {
        NSString *query = @"CREATE TABLE IF NOT EXISTS test(abc TEXT, def TEXT);";
        if (sqlite3_exec(db, [query UTF8String], NULL, NULL, NULL) == SQLITE_OK) {
            query = @"INSERT INTO test(abc, def) VALUES('ABC', '123');";
        }
        sqlite3_close(db);
    }
    return databasePath;
}

来源：https://stackoverflow.com/questions/56151110/found-empty-data-in-sqlite-when-send-via-mfmailcomposecontroller

标签

ios

objective-c

sqlite

core-data

mfmailcomposeviewcontroller