在iOS上发送电子邮件PDF文件

Question

我正在写一个通过电子邮件发送PDF文件的函数。在iOS上，我遇到了一个问题，即生成PDF文件并将其附加到电子邮件并成功发送，但收到的电子邮件由于某种原因未包含原始的pdf文件。

这是我使用MFMailComposeViewController的实现。

MFMailComposeViewController *mailer = [[[MFMailComposeViewController alloc] init] autorelease]; 
[mailer setMailComposeDelegate: id(m_delegate)]; 
[mailer setSubject:subject.toNSString()]; 
NSMutableArray *toRecipients = [[NSMutableArray alloc] init]; 
for(int i = 0; i < recipients.length(); i++) 
{ 
    [toRecipients addObject:recipients.at(i).toNSString()]; 
} 
[mailer setToRecipients:toRecipients]; 
NSString *emailBody = body.toNSString(); 
[mailer setMessageBody:emailBody isHTML:NO]; 


// Determine the file name and extension 
attachedFile = "/var/mobile/Containers/Data/Application/1DFBF012-4838-4350-B465-ECF247831EB3/Library/Application Support/test.pdf"; 
NSArray *filepart = [attachedFile.toNSString() componentsSeparatedByString:@"."]; 
NSString *filename = [filepart objectAtIndex:0]; 
NSString *extension = [filepart objectAtIndex:1]; 

// Get the resource path and read the file using NSData 
NSString *filePath = [[NSBundle mainBundle] pathForResource:filename ofType:extension]; 
NSData *fileData = [NSData dataWithContentsOfFile:filePath]; 

// Determine the MIME type 
NSString *mimeType; 
if ([extension isEqualToString:@"jpg"]) { 
    mimeType = @"image/jpeg"; 
} else if ([extension isEqualToString:@"png"]) { 
    mimeType = @"image/png"; 
} else if ([extension isEqualToString:@"doc"]) { 
    mimeType = @"application/msword"; 
} else if ([extension isEqualToString:@"ppt"]) { 
    mimeType = @"application/vnd.ms-powerpoint"; 
} else if ([extension isEqualToString:@"html"]) { 
    mimeType = @"text/html"; 
} else if ([extension isEqualToString:@"pdf"]) { 
    mimeType = @"application/pdf"; 
} 

// Add attachment 
[mailer addAttachmentData:fileData mimeType:mimeType fileName:filename]; 


[qtController presentViewController:mailer animated:YES completion:nil]; 

我能够看到文件附加到电子邮件并发送它。我能够收到发送的电子邮件。但是，当我打开电子邮件时，它并未包含附加的文件。

任何建议如何解决这个问题？

这里是我保存PDF文件的实现，该文件遵循用于保存应用程序数据的标准文件系统路径。

/* Generate PDF file for sharing */ 
CGRect pageRect = CGRectMake(0, 0, 640, 480); 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentPath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; 
NSString * newFilePath = [documentPath stringByAppendingPathComponent:@"test.pdf"]; 
NSString *strFilename = newFilePath; 
MyCreatePDFFile(pageRect, [strFilename UTF8String]); 

我一直在寻找是否有办法让PDF文件生成故障排除。它位于应用程序支持目录中，由于沙箱策略，其他应用程序无法访问该目录。最快的方法是为我的应用程序启用文件共享。这里有一个有用的链接教你如何为我的应用程序启用文件共享。

How to enable file sharing for my app?

所以我通过iTune的分享从应用程序到我的MAC拉从iPad上的PDF文件。我能够附加相同的文件，并通过电子邮件发送到我的MAC完美。

MFMailComposeViewController似乎并没有抱怨文件，而是默默地拒绝它。这被认为是一个错误？

Answer 1

该错误是由于附件文件路径没有指向想要附加的pdf文件。这里是它的修复：

// Get the resource path and read the file using NSData 
NSString *filePath = newFilePath; // corrected the attachment file path 
NSData *fileData = [NSData dataWithContentsOfFile:filePath]; 

下面的实施应该运行。

/* Generate PDF file for sharing */ 
CGRect pageRect = CGRectMake(0, 0, 640, 480); 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentPath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; 
NSString * newFilePath = [documentPath stringByAppendingPathComponent:@"test.pdf"]; 
NSString *strFilename = newFilePath; 
MyCreatePDFFile(pageRect, [strFilename UTF8String]); 

/* Attach PDF file generated */ 
NSString *emailTitle = @"Email PDF as attachment"; 
NSString *messageBody = @"Hey, check this out!"; 
NSArray *toRecipents = [NSArray arrayWithObject:@"grace@abc.com"]; 

//Implementation using MFMailComposeViewController 
MFMailComposeViewController *mc = [[MFMailComposeViewController alloc] init]; 
mc.mailComposeDelegate = self; 
[mc setSubject:emailTitle]; 
[mc setMessageBody:messageBody isHTML:NO]; 
[mc setToRecipients:toRecipents]; 

// Determine the file name and extension 
NSArray *filepart = [strFilename componentsSeparatedByString:@"."]; 
NSString *filename = [filepart objectAtIndex:0]; 
NSString *extension = [filepart objectAtIndex:1]; 

// Get the resource path and read the file using NSData 
NSString *filePath = newFilePath; 
NSData *fileData = [NSData dataWithContentsOfFile:filePath]; 

// Determine the MIME type 
NSString *mimeType; 
if ([extension isEqualToString:@"jpg"]) { 
    mimeType = @"image/jpeg"; 
} else if ([extension isEqualToString:@"png"]) { 
    mimeType = @"image/png"; 
} else if ([extension isEqualToString:@"doc"]) { 
    mimeType = @"application/msword"; 
} else if ([extension isEqualToString:@"ppt"]) { 
    mimeType = @"application/vnd.ms-powerpoint"; 
} else if ([extension isEqualToString:@"html"]) { 
    mimeType = @"text/html"; 
} else if ([extension isEqualToString:@"pdf"]) { 
    mimeType = @"application/pdf"; 
} 

// Add attachment 
[mc addAttachmentData:fileData mimeType:mimeType fileName:filename]; 

// Present mail view controller on screen 
[self presentViewController:mc animated:YES completion:NULL];