Question

我需要从服务器下载.zip文件，并在解压缩后使用它进行投影。我已成功下载.sqlite文件，我可以使用右键单击（手动）提取它但当我尝试使用minizip和SSZipArchive或ZipArchive提取它时，它会发出错误＆＃34; Can＆＃39 ;打开文件＆＃34;。

如果我手动提取.sqlite并通过右键单击mac来压缩.sqlite文件，那么我的代码将完全解压缩，但每当我尝试直接提取下载的文件时，就会出现此问题。

我已经应用了以下名称格式来编写和提取文件。

在编写文件时，名称为XYZ.sqlite.zip，但也出现错误
XYZ.zip和包含的文件名是XYZ.sqlite。这也给出了错误
我还有一个名为XYZ.sqlite.zip的文件，然后用XYZ.zip重命名然后提取，但这也无效。

以下是代码。

用于下载文件：

 NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:zipURL]];
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent:[zipURL lastPathComponent]];
operation = [[AFDownloadRequestOperation alloc] initWithRequest:request targetPath:path shouldResume:YES];
 [operation.securityPolicy setAllowInvalidCertificates:YES];
 [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
 [self unzipDBFile:path];


} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];

[operation setProgressiveDownloadProgressBlock:
 ^(AFDownloadRequestOperation *operation, NSInteger bytesRead, long long totalBytesRead, long long totalBytesExpected, long long totalBytesReadForFile, long long totalBytesExpectedToReadForFile) {

     NSArray *progress = [NSArray arrayWithObjects:obj_Pro,[NSNumber numberWithFloat:totalBytesReadForFile/(float)totalBytesExpectedToReadForFile], nil];

     [self performSelectorOnMainThread:@selector(updateProgressBar:) withObject:progress waitUntilDone:NO];
 }];
[operation start];

用于提取文件：

-(void)unzipDBFile:(NSString *)filePath
{

 NSString *documentDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                             NSUserDomainMask, YES) objectAtIndex:0];
   NSString *outputPath = [documentDir stringByAppendingPathComponent:@"/DBFolder"];
   BOOL isExtracted =[SSZipArchive unzipFileAtPath:outputPath toDestination:documentDir];

  // NSString *filepath = [[NSBundle mainBundle] pathForResource:@"ZipFileName" ofType:@"zip"];
 //    ZipArchive *zipArchive = [[ZipArchive alloc] init];
 //    [zipArchive UnzipOpenFile:filePath];

 //    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//    NSString *path = [paths objectAtIndex:0];
//    BOOL isExtracted=[zipArchive UnzipFileTo:path overWrite:YES];
//    NSLog(@"PATH=%@",path);
   if (!isExtracted)
    {
     UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Error in extracting" message:@"" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
      [alert show];
      [alert release];
   }else{
     UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Extract Success" message:@"" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
     [alert show];
     [alert release];
   }
//    [zipArchive UnzipCloseFile];
//    [zipArchive release];
}

以下是更新进度条的代码：

- (void)updateProgressBar:(NSArray *)progress
{
 UIProgressView *pgr = (UIProgressView *)[progress objectAtIndex:0];
 [pgr setProgress:[[progress objectAtIndex:1] floatValue]];
}

Answer 1

我已经检查了这个问题并发现.net开发人员，创建.zip的人使用了gzip压缩，因此minizip无法提取它。

为了解压缩它，我使用了iOS zlib框架和下面的代码，这解决了我的问题。在实现此方法之前，您必须在标题中添加以下两项内容。

#import <zlib.h>
#define CHUNK 16384

-(BOOL)unzipDBFile:(NSString *)filePath
{
NSString *documentDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                             NSUserDomainMask, YES) objectAtIndex:0];
documentDir=[documentDir stringByAppendingPathComponent:DATABASE_FILE_NAME];

    gzFile file = gzopen([filePath UTF8String], "rb");
    FILE *dest = fopen([documentDir UTF8String], "w");
    unsigned char buffer[CHUNK];
    int uncompressedLength;
    while ((uncompressedLength = gzread(file, buffer, CHUNK)) ) {
        // got data out of our file
        if(fwrite(buffer, 1, uncompressedLength, dest) != uncompressedLength || ferror(dest)) {

            return FALSE;
        }
    }
    fclose(dest);
    gzclose(file);

return TRUE;
}

使用SSZipArchive OBJ-C解压缩.sqlite文件

1 个答案: