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    <p>try <code>[mailer addAttachmentData:myData mimeType:@"text/csv" fileName:@"expenses.csv"];</code></p> <p><strong>Edit:</strong> This is the code I'm using in my app:</p> <pre><code>- (IBAction) ExportData:(id)sender { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *filePath = [documentsDirectory stringByAppendingPathComponent:kExportFileName]; self.timeRecords = [[NSMutableArray alloc] init]; for (int i=0; i&lt; [self.selectedTimeEntries count]; i++) for (int j=0; j&lt;[[self.selectedTimeEntries objectAtIndex:i] count]; j++) if ([[self.selectedTimeEntries objectAtIndex:i] objectAtIndex:j] == [NSNumber numberWithBool:YES]) [self.timeRecords addObject:[self timeEntriesForDay:[self.uniqueArray objectAtIndex:i] forIndex:j]]; if( !([self.timeRecords count]!=0)) { UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"There are no time entries selected!" message:@"Please select at least one time entry before proceeding" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; return; } NSMutableString *csvLine; NSError *err = nil; NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"yyyy-MM-dd"]; NSString *dateString = nil; NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init]; [numberFormatter setPositiveFormat:@"###0.##"]; NSString *formattedNumberString = nil; if(![[NSFileManager defaultManager] fileExistsAtPath:filePath]) { [[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil]; } for (timeEntries *timeEntry in self.timeRecords) { csvLine = [NSMutableString stringWithString:timeEntry.client]; [csvLine appendString:@","]; [csvLine appendString:timeEntry.category]; [csvLine appendString:@","]; [csvLine appendString:timeEntry.task]; [csvLine appendString:@","]; dateString = [dateFormatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:timeEntry.date]]; [csvLine appendString:dateString]; [csvLine appendString:@","]; formattedNumberString = [numberFormatter stringFromNumber:timeEntry.duration]; [csvLine appendString:formattedNumberString]; [csvLine appendString:@","]; [csvLine appendString:timeEntry.description]; [csvLine appendString:@"\n"]; if([[NSFileManager defaultManager] fileExistsAtPath:filePath]) { NSString *oldFile = [[NSString alloc] initWithContentsOfFile:filePath]; [csvLine insertString:oldFile atIndex:0]; BOOL success =[csvLine writeToFile:filePath atomically:NO encoding:NSUTF8StringEncoding error:&amp;err]; if(success){ } [oldFile release]; } } if (!appDelegate.shouldSendCSV) { self.csvText = csvLine; } if([[NSFileManager defaultManager] fileExistsAtPath:filePath]) { [self emailExport:filePath]; } self.selectedTimeEntries =nil; self.navigationController.toolbarHidden = NO; } - (void)emailExport:(NSString *)filePath { NSLog(@"Should send CSV = %@", [NSNumber numberWithBool:appDelegate.shouldSendCSV]); MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; picker.mailComposeDelegate = self; // Set the subject of email [picker setSubject:@"My Billed Time Export"]; // Add email addresses // Notice three sections: "to" "cc" and "bcc" NSString *valueForEmail = [[NSUserDefaults standardUserDefaults] stringForKey:@"emailEntry"]; NSString *valueForCCEmail = [[NSUserDefaults standardUserDefaults] stringForKey:@"ccEmailEntry"]; if( valueForEmail == nil || [valueForEmail isEqualToString:@""]) { UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Please set an email address before sending a time entry!" message:@"You can change this address later from the settings menu of the application!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; return; } else { [picker setToRecipients:[NSArray arrayWithObjects:valueForEmail, nil]]; } if(valueForCCEmail != nil || ![valueForCCEmail isEqualToString:@""]) { [picker setCcRecipients:[NSArray arrayWithObjects:valueForCCEmail, nil]]; } // Fill out the email body text NSString *emailBody = @"My Billed Time Export File."; // This is not an HTML formatted email [picker setMessageBody:emailBody isHTML:NO]; if (appDelegate.shouldSendCSV) { // Create NSData object from file NSData *exportFileData = [NSData dataWithContentsOfFile:filePath]; // Attach image data to the email [picker addAttachmentData:exportFileData mimeType:@"text/csv" fileName:@"MyFile.csv"]; } else { [picker setMessageBody:self.csvText isHTML:NO]; } // Show email view [self presentModalViewController:picker animated:YES]; // Release picker [picker release]; } </code></pre>
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