Question

在transmitData方法中，NSArray文件即将出现。我的代码中的问题在哪里？我保存了一个文件（我们点击[文件writeToURL：fileURL atomically：YES]）然后我们调用transmitData，但无法检索文件。

#import "FileManagerService.h"
#import "SynthesizeSingleton.h"
@implementation FileManagerService
SYNTHESIZE_SINGLETON_FOR_CLASS(FileManagerService);

#define SAVEVOTER @"SV"
#define SAVESCRIPT @"SS"

- (NSURL *)applicationDocumentsDirectory 
{
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory   inDomains:NSUserDomainMask] lastObject];
}

-(void)saveFile:(NSData*)file:(NSString*)dataType
{
NSFileManager *manager = [NSFileManager defaultManager];
NSURL *fileURL;
NSString *fileName;

if (dataType == DATA_SAVE_VOTER)
{
    fileName = [NSString stringWithFormat:@"%@01",SAVEVOTER];
    fileURL = [[self applicationDocumentsDirectory]URLByAppendingPathComponent:fileName];

    int fID = 0;

    while ([manager fileExistsAtPath:[fileURL absoluteString]]) 
    {
        fID++;

        fileName = [NSString stringWithFormat:@"%@%d",SAVEVOTER,fID];
        fileURL = [[self applicationDocumentsDirectory]URLByAppendingPathComponent:fileName];
    }

}
else if (dataType == DATA_SAVE_SCRIPT)
{
    fileName = [NSString stringWithFormat:@"%@01",SAVESCRIPT];
    fileURL = [[self applicationDocumentsDirectory]URLByAppendingPathComponent:fileName];

    int fID = 0;

    while ([manager fileExistsAtPath:[fileURL absoluteString]]) 
    {
        fID++;

        fileName = [NSString stringWithFormat:@"%@%d",SAVESCRIPT,fID];
        fileURL = [[self applicationDocumentsDirectory]URLByAppendingPathComponent:fileName];
    }

}


[file writeToURL:fileURL atomically:YES];
}


-(void)transmitData
{
NSArray *files = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[[self applicationDocumentsDirectory]absoluteString] error:NULL];

if (files == nil || [files count] <= 0)
{
    NSLog(@"No files to transmit");
    return;
}

for (id file in files) 
{ 
    NSData * dt = file;
    NSString *str = [[NSString alloc]initWithData:dt encoding:NSUTF8StringEncoding];

    NSLog(@"DataContents: %@",str);
}
}

@end

编辑：经过更多测试：

fileName = @"testfile";
    fileURL = [[self    applicationDocumentsDirectory]URLByAppendingPathComponent:fileName];

        NSLog(@"URL1: %@",[fileURL absoluteString]);

我的日志即将出现。所以我无法检索文件，因为我显然是使用空文件位置保存....为什么会发生这种情况？

FIXED：

所以我不知道为什么，但[文件writeToURL：fileURL atomically：YES]不起作用，[[NSFileManager defaultManager] createFileAtPath：fileURL 内容：文件属性：无]; 确实有效。

Answer 1

使用

- (NSURL *)applicationDocumentsDirectory
{
    NSArray *searchPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentPath = [searchPaths objectAtIndex:0];

    return [NSURL fileURLWithPath:documentPath];
}

和

NSArray *files = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[[self applicationDocumentsDirectory]path] error:NULL];

NSFileManager无法检索文件

1 个答案: