Question

我正在处理iPhone项目中的一些文件操作。我需要搜索特定扩展名的文件。一种选择是手动处理每个文件＆amp;要查找的目录。我的问题是，有没有简单的方法可以做到这一点？

由于

Answer 1

请参阅使用NSFileManager您可以获取文件并显示条件，您可以获取具有特定扩展名的文件，它在文档目录中工作..

-(NSArray *)findFiles:(NSString *)extension
{
    NSMutableArray *matches = [[NSMutableArray alloc]init];
    NSFileManager *manager = [NSFileManager defaultManager];

    NSString *item;
    NSArray *contents = [manager contentsOfDirectoryAtPath:[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] error:nil];
    for (item in contents)
    {
        if ([[item pathExtension]isEqualToString:extension])
        {
            [matches addObject:item];
        }
    }

    return matches;
}

将此数组与搜索到的文件一起使用..获取NSArray类型的返回值，因此请使用NSArray对象存储此数据...

我希望这对你有帮助......

Answer 2

您需要的是递归方法，以便您可以处理子目录。以下第一种方法是公开的;另一个私人。想象一下，它们是作为名为CocoaUtil的类的静态方法实现的：

CocoaUtil.h：

@interface CocoaUtil : NSObject

+ (NSArray *)findFilesWithExtension:(NSString *)extension
                           inFolder:(NSString *)folder;

@end

CocoaUtil.m：

// Private Methods
@interface CocoaUtil ()

+ (NSArray *)_findFilesWithExtension:(NSString *)extension
                            inFolder:(NSString *)folder
                        andSubFolder:(NSString *)subFolder;

@end

@implementation CocoaUtil

+ (NSArray *)findFilesWithExtension:(NSString *)extension
                           inFolder:(NSString *)folder
{
    return [CocoaUtil _findFilesWithExtension:extension
                                     inFolder:folder
                                 andSubFolder:nil];
}

+ (NSArray *)_findFilesWithExtension:(NSString *)extension
                            inFolder:(NSString *)folder
                        andSubFolder:(NSString *)subFolder
{
    NSMutableArray *found = [NSMutableArray array];
    NSString *fullPath = (subFolder != nil) ? [folder stringByAppendingPathComponent:subFolder] : folder;

    NSFileManager *fileman = [NSFileManager defaultManager];
    NSError *error;
    NSArray *contents = [fileman contentsOfDirectoryAtPath:fullPath error:&error];
    if (contents == nil)
    {
        NSLog(@"Failed to find files in folder '%@': %@", fullPath, [error localizedDescription]);
        return nil;
    }

    for (NSString *file in contents)
    {
        NSString *subSubFolder = subFolder != nil ? [subFolder stringByAppendingPathComponent:file] : file;
        fullPath = [folder stringByAppendingPathComponent:subSubFolder];

        NSError *error = nil;
        NSDictionary *attributes = [fileman attributesOfItemAtPath:fullPath error:&error];
        if (attributes == nil)
        {
            NSLog(@"Failed to get attributes of file '%@': %@", fullPath, [error localizedDescription]);
            continue;
        }

        NSString *type = [attributes objectForKey:NSFileType];

        if (type == NSFileTypeDirectory)
        {
            NSArray *subContents = [CocoaUtil _findFilesWithExtension:extension inFolder:folder andSubFolder:subSubFolder];
            if (subContents == nil)
                return nil;
            [found addObjectsFromArray:subContents];
        }
        else if (type == NSFileTypeRegular)
        {
            // Note: case sensitive comparison!
            if ([[fullPath pathExtension] isEqualToString:extension])
            {
                [found addObject:fullPath];
            }
        }
    }

    return found;
}

@end

这将返回一个数组，其中包含具有指定文件扩展名的每个文件的完整路径。请注意，[NSString pathExtension]不会返回文件扩展名的.，因此请务必不要在extension参数中传递该内容。

Answer 3

我还没有发现任何我能说的很简单的事情。最后我必须编写自己的代码才能做到这一点。我在这里张贴这个，因为也许有人会发现这个帮助。

-(void)search{
@autoreleasepool {
    NSString *baseDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

    NSFileManager *defFM = [NSFileManager defaultManager];
    BOOL isDir = YES;

        NSArray *fileTypes = [[NSArray alloc] initWithObjects:@"mp3",@"mp4",@"avi",nil];
        NSMutableArray *mediaFiles = [self searchfiles:baseDir ofTypes:fileTypes];
        NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
        NSString *filePath = [docDir stringByAppendingPathComponent:@"playlist.plist"];
        if(![defFM fileExistsAtPath:filePath isDirectory:&isDir]){
            [defFM createFileAtPath:filePath contents:nil attributes:nil];
        }

        NSMutableDictionary *playlistDict = [[NSMutableDictionary alloc]init];
        for(NSString *path in mediaFiles){
            NSLog(@"%@",path);
            [playlistDict setValue:[NSNumber numberWithBool:YES] forKey:path];
        }

        [playlistDict writeToFile:filePath atomically:YES];

        [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshplaylist" object:nil];
    }

}

现在是递归方法

-(NSMutableArray*)searchfiles:(NSString*)basePath ofTypes:(NSArray*)fileTypes{
    NSMutableArray *files = [[[NSMutableArray alloc]init] autorelease];
    NSFileManager *defFM = [NSFileManager defaultManager];
    NSError *error = nil;
    NSArray *dirPath = [defFM contentsOfDirectoryAtPath:basePath error:&error];
    for(NSString *path in dirPath){
       BOOL isDir;
       path = [basePath stringByAppendingPathComponent:path];
       if([defFM fileExistsAtPath:path isDirectory:&isDir] && isDir){
          [files addObjectsFromArray:[self searchfiles:path ofType:fileTypes]];
       }
    }


   NSArray *mediaFiles = [dirPath pathsMatchingExtensions:fileTypes];
   for(NSString *fileName in mediaFiles){
      fileName = [basePath stringByAppendingPathComponent:fileName];
      [files addObject:fileName];
   }

   return files;
}

Answer 4

是的，我们有以下NSArray的直接方法帮助您

 NSMutableArray *arrayFiles = [[NSMutableArray alloc] initWithObjects:@"a.png", @"a.jpg",  @"a.pdf", @"h.png", @"f.png", nil];
    NSLog(@"pathsMatchingExtensions----%@",[arrayFiles pathsMatchingExtensions:[NSArray arrayWithObjects:@"png", nil]]);

//my output is
"a.png",
"h.png",
"f.png"

Answer 5

通过这种方式，您可以找到特定的文件扩展名

 NSString *bundleRoot = [[NSBundle mainBundle] bundlePath];
    NSFileManager *manager = [NSFileManager defaultManager];
    NSDirectoryEnumerator *direnum = [manager enumeratorAtPath:bundleRoot];

    NSString *filename;

    while ((filename = [direnum nextObject] )) {


        if ([filename hasSuffix:@".doc"]) {   //change the suffix to what you are looking for


            [arrayListofFileName addObject:[filename stringByDeletingPathExtension]];


        }

    }

Answer 6

使用以下代码

NSArray *myFiles = [myBundle pathsForResourcesOfType:@"Your File extension"
                                    inDirectory:nil];

使用特定扩展目标c进行文件搜索

6 个答案: