如何将我的Zip文件转换为NSData以作为附件发送我的Zip文件 [英] How can I convert my Zip-file to NSData to email my Zip file as an attachment

问题描述

我使用目标Zip库来压缩我拍摄的几张图像。我来到这个点（我猜）我在哪里压缩一个图像。

现在我想用mailcomposer发送这个压缩文件。但是我需要在我的邮件功能中声明一个NSData对象。

  [picker addAttachmentData：NSData objectmimeType：@application / zipfileName：@test.zip]; 
  

这是我的代码片段

   - （IBAction）sendMail {
 NSArray * paths = NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）; 
 NSString * documentsDirectory = [paths objectAtIndex：0]; 
 
 NSString * path = [documentsDirectory stringByAppendingPathComponent：@test.zip]; 
 NSArray * data = [[NSArray alloc] initWithObjects：@first，@second，@third，nil]; 
 
 NSString * docDir3 = [NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）objectAtIndex：0]; 
 NSString * pngFilePath4 = [NSString stringWithFormat：@％@ / foto2.jpg，paths]; 
 [data writeToFile：pngFilePath4 atomically：YES]; 
 
 NSData * fotoData = [[NSData alloc] initWithContentsOfFile：pngFilePath4]; 
 
 NSFileManager * manager = [[NSFileManager alloc] init]; 
 [manager removeItemAtPath：pngFilePath4 error：nil]; 
 
 ZipFile * readFile = [[ZipFile alloc] initWithFileName：路径模式：ZipFileModeCreate]; 
 
 ZipWriteStream * stream = [readFile writeFileInZipWithName：@foto2.jpgcompressionLevel：ZipCompressionLevelNone]; 
 
 [stream writeData：fotoData]; 
 [stream finishedWriting]; 
 
 MFMailComposeViewController * picker = [[MFMailComposeViewController alloc] init]; 
 picker.mailComposeDelegate = self; 
 
 [picker addAttachmentData：NSData ObjectmimeType：@application / zipfileName：@test.zip]; 
 
 Class mailclass =（NSClassFromString（@MFMailComposeViewController））; 
 if（[mailclass canSendMail]）{
 [self presentModalViewController：picker animated：YES]; 
} 
 
 [readFile close]; 
 [data2 release]; 
 [fotoData release]; 
} 
  

我想我需要从readFile对象中创建另一个NSData对象，并将此在[picker attachmentData：method]中。希望有人能指出我正确的方向。

编辑

仍然无法使其正常工作。发送zip文件需要很长的时间（甚至通过wifi）。当我打开zip映像时，我收到一条错误，表示该文件无法打开。这是我的代码：

  NSArray * paths = NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）; 
 NSString * documentsDirectory = [paths objectAtIndex：0]; 
 
 NSString * path = [documentsDirectory stringByAppendingPathComponent：@test.zip]; 
 NSArray * data = [[NSArray alloc] initWithObjects：@first，@second，nil]; 
 
 NSString * docDir3 = [NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）objectAtIndex：0]; 
 NSString * pngFilePath3 = [NSString stringWithFormat：@％@ / foto2.jpeg，docDir3]; 
 NSData * imageData2 = [[[NSData alloc] initWithContentsOfFile：pngFilePath3] autorelease]; 
 
 [data writeToFile：pngFilePath3 atomically：YES]; 
 
 ZipFile * readFile = [[ZipFile alloc] initWithFileName：路径模式：ZipFileModeCreate]; 
 
 ZipWriteStream * stream = [readFile writeFileInZipWithName：@foto2.jpegcompressionLevel：ZipCompressionLevelNone]; 
 
 [stream writeData：imageData2]; 
 [stream finishedWriting]; 
 
 
 MFMailComposeViewController * picker = [[MFMailComposeViewController alloc] init]; 
 picker.mailComposeDelegate = self; 
 [picker addAttachmentData：[NSData dataWithContentsOfFile：path] mimeType：@application / zipfileName：@test.zip]; 
 
 Class mailclass =（NSClassFromString（@MFMailComposeViewController））; 
 if（[mailclass canSendMail]）{
 [self presentModalViewController：picker animated：YES]; 
} 
 
 [数据发布]; 
 [readFile close]; 
  

提前感谢帮助我！

解决方案

ZipWriteStream 正在写入路径，并从文件路径使用 [NSData dataWithContentsOfFile：path] 完成。

 选择器addAttachmentData：[NSData dataWithContentsOfFile：path] 
 mimeType：@application / zip
 fileName：@test.zip]; 
  

当写入失败时，Objective-Zip会抛出异常，请确保添加一个try / catch写操作并确保您的数据不为零。

I', m using the Objective Zip library to compress several images i took. I came to the point (I guess) where I' zipping an image.

Now I'd like to send this zipped File with the mailcomposer. However I need to declare a "NSData object" within my mail function.

[picker addAttachmentData:"NSData object" mimeType:@"application/zip" fileName:@"test.zip"];

Here's a snippit of my code

-(IBAction)sendMail{
    NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"test.zip"]; 
    NSArray *data = [[NSArray alloc] initWithObjects:@"first",@"second",@"third",nil];

    NSString *docDir3 = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *pngFilePath4 = [NSString stringWithFormat:@"%@/foto2.jpg",paths];
    [data writeToFile:pngFilePath4 atomically:YES];

    NSData * fotoData = [[NSData alloc] initWithContentsOfFile:pngFilePath4];

    NSFileManager *manager = [[NSFileManager alloc] init]; 
    [manager removeItemAtPath:pngFilePath4 error:nil];

    ZipFile *readFile = [[ZipFile alloc] initWithFileName:path mode:ZipFileModeCreate];

    ZipWriteStream *stream = [readFile writeFileInZipWithName:@"foto2.jpg" compressionLevel:ZipCompressionLevelNone];

    [stream writeData:fotoData];
    [stream finishedWriting];

    MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
    picker.mailComposeDelegate=self;

    [picker addAttachmentData:"NSData Object" mimeType:@"application/zip" fileName:@"test.zip"];

    Class mailclass = (NSClassFromString(@"MFMailComposeViewController"));
    if([mailclass canSendMail]){
        [self presentModalViewController:picker animated:YES];
    }

    [readFile close];
    [data2 release];
    [fotoData release];
}

I think i need to make another NSData object from the readFile object and place this within the [picker attachmentData: method]. Hope someone can point me in the right direction.

EDIT

Still can't get this to work properly. It takes realy long to send the zip file (Even through wifi). When I open the zip image I get an error which says that the file cannot be opened. Here's my code:

NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"test.zip"]; 
    NSArray *data = [[NSArray alloc] initWithObjects:@"first",@"second", nil];

    NSString *docDir3 = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 
    NSString *pngFilePath3 = [NSString stringWithFormat:@"%@/foto2.jpeg",docDir3];
    NSData * imageData2 = [[[NSData alloc] initWithContentsOfFile:pngFilePath3] autorelease];

    [data writeToFile:pngFilePath3 atomically:YES];

    ZipFile *readFile = [[ZipFile alloc] initWithFileName:path mode:ZipFileModeCreate];

    ZipWriteStream *stream = [readFile writeFileInZipWithName:@"foto2.jpeg" compressionLevel:ZipCompressionLevelNone];

    [stream writeData:imageData2];
    [stream finishedWriting];


    MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
    picker.mailComposeDelegate=self;
   [picker addAttachmentData:[NSData dataWithContentsOfFile:path] mimeType:@"application/zip" fileName:@"test.zip"];

    Class mailclass = (NSClassFromString(@"MFMailComposeViewController"));
    if([mailclass canSendMail]){
        [self presentModalViewController:picker animated:YES];
    }

    [data release];
    [readFile close];

Thanks in advance for helping me out!

解决方案

The ZipWriteStream is writing to path, and getting data from a file path is done using [NSData dataWithContentsOfFile:path].

[picker addAttachmentData:[NSData dataWithContentsOfFile:path] 
                 mimeType:@"application/zip" 
                 fileName:@"test.zip"];

Objective-Zip does throw exceptions when a write failure occurs so make sure you add a try/catch around the write operation and make sure your data is not nil.

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