Ios 通过电子邮件发送的NSDictionary文件与应用程序中的相同文件不同

在我的应用程序中，我在NSDictionary中存储了大约6个不同的键，并将该字典存储为一个文件，以便将其发送给应用程序的其他用户。我的三个键是存储为字符串的数字：（例如）

我用一些相关的媒体文件将其压缩并发送出去

通常一切正常。应用程序接收压缩文件，将其解压，读取NSDictionary文件（基本上是XML），并根据刚刚收到的信息创建一个对象

然而，事情并不总是正确的。这个问题让我特别困惑，因为我的应用程序和电脑都收到了相同的文件。在我的应用程序读取的文件中，作为字符串存储的数字键（如上面的示例）被更改为0.00000

 <key>altitude</key>
 <string>0.00000000000000000000000000000000000000000000000000</string>

要解压缩：

     NSData *fileAsData = [NSData dataWithContentsOfURL:file];
     NSString *urlAsString = file.absoluteString;
     NSArray *brokenFile = [urlAsString componentsSeparatedByString:@"/"];
     NSString *fileName = [brokenFile lastObject];
     NSString *buildPath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"constructing"];
     createDirectory(buildPath);
     NSString *filePath = [buildPath stringByAppendingPathComponent:fileName];
     [fileAsData writeToFile:filePath atomically:NO];
     ////HERE IS THE CLASS IMPORTED FROM github
     bool upziped = [SSZipArchive unzipFileAtPath:filePath toDestination:buildPath];
     if (upziped) {
         NSLog(@"unzipped");
     }
     else {
         NSLog(@"not unzipped");
     }
     NSArray* buildDirectory = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:buildPath error:NULL];

     //import NSDictionary file
     ObjectItem *object = nil; /* This is the object I'm re-creating with my file*/
     for (NSString*s in buildDirectory) {
         NSLog(@"files here: %@",s);
         if ([s rangeOfString:@".xml"].location != NSNotFound) {
             NSString *name = [[s componentsSeparatedByString:@"."]firstObject];
             object = [ObjectItem retrieveFromName:name];
             break;
         }
     }

     //import image
     UIImage *image;
     for (NSString *media in buildDirectory) {
         if ([media rangeOfString:@".png"].location != NSNotFound) {
             NSString *imageFilePath = [buildPath stringByAppendingPathComponent:media];
             image = [[UIImage alloc]initWithContentsOfFile:imageFilePath];
             [object importImage:image];
             break;
         }
     }

     //import video
     for (NSString *media in buildDirectory) {
         if ([media rangeOfString:@".MOV"].location != NSNotFound) {
             NSString *videoFilePath = [buildPath stringByAppendingPathComponent:media];
             [object importVideo:videoFilePath];
             break;
         }
     }

     //import audio
     NSString *audioExt = [NSString stringWithFormat:@".%@",AUDIO_EXT];
     for (NSString *media in buildDirectory) {
         if ([media rangeOfString:audioExt].location != NSNotFound) {
             NSString *audioFilePath = [buildPath stringByAppendingPathComponent:media];
             [object importAudio:audioFilePath];
             break;
         }
     }

     [object save];

此外，如果[ObjectItem retrieveFromName]方法在这里有帮助

 +(ObjectItem
      *)retrieveFromName:(NSString*)name {
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     NSString *documentsDirectory = [paths objectAtIndex:0];
     NSString *subDirectory = [documentsDirectory stringByAppendingPathComponent:@"ObjectItems"];
     createDirectory(subDirectory);
     NSString *filePath = [subDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.xml",name]];
     NSString *file = [NSString stringWithContentsOfFile:filePath encoding:NSASCIIStringEncoding error:nil];
     NSLog(@"file contents:\n%@\n",file);
     file = nil;
     NSDictionary *myDict = [NSDictionary dictionaryWithContentsOfFile:filePath];
     for (NSString *s in myDict) {
         NSLog(@"key \"%@\" has value: %@",s,[myDict objectForKey:s]);
     }
     double lat = [[myDict objectForKey:@"latitude"]doubleValue];
     double lon = [[myDict objectForKey:@"longitude"]doubleValue];
     double alt = [[myDict objectForKey:@"altitude"]doubleValue];
     CLLocation *loc = [[CLLocation alloc]initWithCoordinate:CLLocationCoordinate2DMake(lat, lon)
                                                    altitude:alt
                                          horizontalAccuracy:kCLLocationAccuracyBestForNavigation
                                            verticalAccuracy:kCLLocationAccuracyBestForNavigation
                                                   timestamp:[NSDate date]];
     UIImage *im = nil;
     NSString *vid = nil;
     NSString *aud = nil;

     ObjectItem
       *object
       = [[ObjectItem
       alloc]initWithName:name location:loc];
     NSString *key = [myDict objectForKey:@"image"];
     if (key != nil) {
         im = [UIImage imageWithContentsOfFile:key];
         [object
       importImage:[im copy]];
     }
     key = nil;
     key = [myDict objectForKey:@"video"];
     if (key != nil) {
         vid = [NSString stringWithString:key];
         [object
       importVideo:[vid copy]];
     }
     key = nil;
     key = [myDict objectForKey:@"audio"];
     if (key != nil) {
         aud = [NSString stringWithString:key];
         [object
       importAudio:[aud copy]];
     }
     paths = nil;
     documentsDirectory = subDirectory = filePath = nil;
     im = nil;
     vid = nil;
     aud = nil;
     myDict = nil;
     key = nil;
     return object
      ;
 }

---

我希望答案是深刻的，但不幸的是，原因是懒惰编程的结果。在我的应用程序中有两个地方，我可以使用文件重新创建我的

ObjectItem

。其中一个是从文档文件夹中的信息重新创建对象，另一个是从临时文件夹中的信息重新创建对象

---

我用来从文件中重新创建对象的方法（我在上面有）

+（ObjectItem*）retrieveFromName:

总是在文档文件夹中查找。当它没有看到那里的文件时，我的应用程序将重新创建没有高度/坐标的

ObjectItem

，并在文档文件夹中生成相应的文件。

旁注-为什么要保留50个小数位？一个

double

只适用于大约13或14个有效数字。你说得对。我想这有点过分了。我遇到了一些由于精度不足而导致的错误，我可能有点补偿过度了。我们不知道你从哪里得到的高度。我们需要看更多的代码。这真的重要吗？据我所知，这些值是正确写入的，并在台式机上进行了验证@dev574，您是否100%确定值写入正确？对他们来说，事后更改是相当神秘的。我看不出有什么办法可以帮助他们，只是说文件中的值不会自动更改。要弄清这一点，你所说的“我把它压缩并发送到我的应用程序”和“我将相同的文件发送到我的计算机”都是什么意思。请用代码（和NSLog输出）重述这些句子。其他评论员提示您发布不相关的代码。请随意取下它。（换句话说，请添加这样的内容：在发送之前，这里是NSLog输出。这里是我压缩和发送的方式，这里是接收端不同的日志输出）。

     //first locate temp directory
     NSString *tmpDirectory = NSTemporaryDirectory();
     NSMutableString *fileNameOfZip = [NSMutableString stringWithFormat:@"%@.zip",_name];
     [fileNameOfZip replaceOccurrencesOfString:@" " withString:@"_" options:NSBackwardsSearch range:NSMakeRange(0, fileNameOfZip.length)];
     NSString *zipFilePath = [tmpDirectory stringByAppendingPathComponent:
                              fileNameOfZip];

     //then find all files related to zipping
     NSString *mainFilePath = [FILE_DIR stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.xml",_name]];
     NSString *imageFilePath = [self saveImages];
     NSString *videoFilePath = [self saveVideo];
     NSString *audioFilePath = [self saveAudio];
     NSMutableArray *filesToAdd = [[NSMutableArray alloc]initWithObjects: nil];
     [filesToAdd addObject:mainFilePath];
     [filesToAdd addObject:imageFilePath];
     [filesToAdd addObject:videoFilePath];
     [filesToAdd addObject:audioFilePath];
     ////HERE IS THE CLASS IMPORTED FROM github
     bool successful_zip = [SSZipArchive createZipFileAtPath:zipFilePath withFilesAtPaths:filesToAdd];

     NSData *fileAsData = [NSData dataWithContentsOfURL:file];
     NSString *urlAsString = file.absoluteString;
     NSArray *brokenFile = [urlAsString componentsSeparatedByString:@"/"];
     NSString *fileName = [brokenFile lastObject];
     NSString *buildPath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"constructing"];
     createDirectory(buildPath);
     NSString *filePath = [buildPath stringByAppendingPathComponent:fileName];
     [fileAsData writeToFile:filePath atomically:NO];
     ////HERE IS THE CLASS IMPORTED FROM github
     bool upziped = [SSZipArchive unzipFileAtPath:filePath toDestination:buildPath];
     if (upziped) {
         NSLog(@"unzipped");
     }
     else {
         NSLog(@"not unzipped");
     }
     NSArray* buildDirectory = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:buildPath error:NULL];

     //import NSDictionary file
     ObjectItem *object = nil; /* This is the object I'm re-creating with my file*/
     for (NSString*s in buildDirectory) {
         NSLog(@"files here: %@",s);
         if ([s rangeOfString:@".xml"].location != NSNotFound) {
             NSString *name = [[s componentsSeparatedByString:@"."]firstObject];
             object = [ObjectItem retrieveFromName:name];
             break;
         }
     }

     //import image
     UIImage *image;
     for (NSString *media in buildDirectory) {
         if ([media rangeOfString:@".png"].location != NSNotFound) {
             NSString *imageFilePath = [buildPath stringByAppendingPathComponent:media];
             image = [[UIImage alloc]initWithContentsOfFile:imageFilePath];
             [object importImage:image];
             break;
         }
     }

     //import video
     for (NSString *media in buildDirectory) {
         if ([media rangeOfString:@".MOV"].location != NSNotFound) {
             NSString *videoFilePath = [buildPath stringByAppendingPathComponent:media];
             [object importVideo:videoFilePath];
             break;
         }
     }

     //import audio
     NSString *audioExt = [NSString stringWithFormat:@".%@",AUDIO_EXT];
     for (NSString *media in buildDirectory) {
         if ([media rangeOfString:audioExt].location != NSNotFound) {
             NSString *audioFilePath = [buildPath stringByAppendingPathComponent:media];
             [object importAudio:audioFilePath];
             break;
         }
     }

     [object save];

 +(ObjectItem
      *)retrieveFromName:(NSString*)name {
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     NSString *documentsDirectory = [paths objectAtIndex:0];
     NSString *subDirectory = [documentsDirectory stringByAppendingPathComponent:@"ObjectItems"];
     createDirectory(subDirectory);
     NSString *filePath = [subDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.xml",name]];
     NSString *file = [NSString stringWithContentsOfFile:filePath encoding:NSASCIIStringEncoding error:nil];
     NSLog(@"file contents:\n%@\n",file);
     file = nil;
     NSDictionary *myDict = [NSDictionary dictionaryWithContentsOfFile:filePath];
     for (NSString *s in myDict) {
         NSLog(@"key \"%@\" has value: %@",s,[myDict objectForKey:s]);
     }
     double lat = [[myDict objectForKey:@"latitude"]doubleValue];
     double lon = [[myDict objectForKey:@"longitude"]doubleValue];
     double alt = [[myDict objectForKey:@"altitude"]doubleValue];
     CLLocation *loc = [[CLLocation alloc]initWithCoordinate:CLLocationCoordinate2DMake(lat, lon)
                                                    altitude:alt
                                          horizontalAccuracy:kCLLocationAccuracyBestForNavigation
                                            verticalAccuracy:kCLLocationAccuracyBestForNavigation
                                                   timestamp:[NSDate date]];
     UIImage *im = nil;
     NSString *vid = nil;
     NSString *aud = nil;

     ObjectItem
       *object
       = [[ObjectItem
       alloc]initWithName:name location:loc];
     NSString *key = [myDict objectForKey:@"image"];
     if (key != nil) {
         im = [UIImage imageWithContentsOfFile:key];
         [object
       importImage:[im copy]];
     }
     key = nil;
     key = [myDict objectForKey:@"video"];
     if (key != nil) {
         vid = [NSString stringWithString:key];
         [object
       importVideo:[vid copy]];
     }
     key = nil;
     key = [myDict objectForKey:@"audio"];
     if (key != nil) {
         aud = [NSString stringWithString:key];
         [object
       importAudio:[aud copy]];
     }
     paths = nil;
     documentsDirectory = subDirectory = filePath = nil;
     im = nil;
     vid = nil;
     aud = nil;
     myDict = nil;
     key = nil;
     return object
      ;
 }