NSFileManager createFile失败

Question

NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *filePath;

if (str_FolderName!=nil){
    filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"/%@/%@",str_FolderName,str_FileName]];
} else {
    filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"/%@",str_FileName]];
}

NSFileManager *fileManager = [NSFileManager defaultManager];
NSMutableDictionary *data;

if ([fileManager fileExistsAtPath: filePath])
{
    //file is exist
    data = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath];

} else {
    BOOL Success = [fileManager createFileAtPath:filePath contents:nil attributes:nil];
    // sometime return YES, sometime return NO <<< this is my question
    if(Success == YES){
        data = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath];
    }else{ 
        data = [[NSMutableDictionary alloc] init];            
    }
}

for (uint32_t u32_Cnt=0;u32_Cnt<arr_Keys.count;u32_Cnt++) {
    [data setValue:[NSString stringWithFormat:@"%@",[marr_Data objectAtIndex:u32_Cnt]] forKey:[arr_Keys objectAtIndex:u32_Cnt]];
}

if ([data writeToFile:filePath atomically: YES])
{
    NSLog(@"[Save OK]");

    return DEF_PASS;
} else {
    NSLog(@"[Save Fail]");  <<<<   now happened
}

如果我检查过的文件不存在，那么我想要创建文件为filepath。

我的设备有时成功，有时失败

Filepath如下：

@"/var/mobile/Containers/Data/Application/xxxxxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx/Documents/mfolder/myfile“

有人能帮我吗？

Answer 1

我更新了你的一些代码。我为我妥善分配了NSFilemanager及其工作。您可以在文件路径或filemanager对象中出现问题。

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

    if (str_FolderName!=nil){
        filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"/%@/%@",str_FolderName,str_FileName]];
    }else{
        filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"/%@",str_FileName]];
    }
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSMutableDictionary *data;
    if ([fileManager fileExistsAtPath: filePath])
    {
        //file is exist
        data = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath];

    }
    else
    {
        if (str_FolderName!=nil){
            NSString *strDicPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"/%@",str_FolderName]];
            // You need to create director before creating file.
            if (![[NSFileManager defaultManager] fileExistsAtPath:strDicPath])
            {
                NSError *error;
                [[NSFileManager defaultManager] createDirectoryAtPath:strDicPath withIntermediateDirectories:NO attributes:nil error:&error]; //Create folder
            }

        }
        BOOL Success = [fileManager createFileAtPath:filePath contents:nil attributes:nil];
        // sometime return YES, sometime return NO <<< this is my question
        if(Success == YES){
            data = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath];
        }else{ 
            data = [[NSMutableDictionary alloc] init];            
        }
    }

我还在模拟器和设备中检查了这段代码。

用于将字符串写入文件：

NSError *error;
NSString *stringToWrite = @"1\n2\n3\n4";
[stringToWrite writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error];