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    <p>as you say, the problem seems most probably to do with memory management, given the memory warnings you are receiving.</p> <p>your code is retaining a reference count to the attachmentData from the first file even as it goes out to get the zipData for the second file. internally, the picker is probably copying that data …</p> <p>so the more you can do to release your references to large data as early as possible, the more likely you are not to get the memory warnings.</p> <p>and if the problem is that the picker is unable to finish the attachment due to running out of memory, and you are able to get through it by doing early release, then breaking up the code in the following way may help you.</p> <pre><code>- (void)sendMailPicker:(MFMailComposeViewController*)picker addAttachmentUsingMimeType:(NSString*)mimeType { NSString *filePath = [self getFilePath:pType]; NSData *attachmentData = [NSData dataWithContentsOfFile:filePath]; [picker addAttachmentData:attachmentData mimeType:mimeType fileName:[filePath lastPathComponent]]; } - (void)sendMailAddPhotoUsingPicker:(MFMailComposeViewController*)picker { NSString *zipFile = [self getZipPath]; NSData *zipData = [NSData dataWithContentsOfFile:zipFile]; [picker addAttachmentData:zipData mimeType:@"application/zip" fileName:[zipFile lastPathComponent]]; } - (void)sendMail { MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; [self prepareMailPicker:picker]; NSString *mimeType; int userPhoto = [User getCSVPhoto]; switch (pType) { case EPDF: mimeType = @"application/pdf"; userPhoto = [User getPDFPhoto]; break; case ECSV: mimeType = @"text/csv"; break; case EExcel: mimeType = @"application/vnd.ms-excel"; break; default: break; } [self sendMailPicker:picker addAttachmentUsingMimeType:mimeType]; if (userPhoto == 1 &amp;&amp; shouldAddZip) { [self sendMailAddPhotoUsingPicker:picker]; } shouldAddZip = NO; [self presentModalViewController:picker animated:YES]; } </code></pre>
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    1. POWhy is MFMailComposeViewController returning MFMailComposeResultFailed?
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    1. USjohn.k.doe
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    1. COAfter further testing and the use of your code, I managed to pinpoint the bug to the "send" action of the composer. As suggested by @Andrea, I monitored allocations and when presenting the mail composer, I see my memory rising up by 6.5 Mo, which is the size of the zip file. It adds up to 9.5 Mo and when I click on the send button, I start receiving 4 memory warnings and get the MFMailComposeResultFailed. So the composer caches the data without any problem but can't send it afterwards...
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      1. USnicolasthenoz
 

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