文件名的最大长度 [英] max length of file name

问题描述

我使用下面的代码将图像保存在 NSDocumentDirectory

i am using the code below to save an image in the NSDocumentDirectory

-(BOOL)saveImage:(UIImage *)image name:(NSString *)name{

    NSString *dir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 
    NSString *path = [NSString pathWithComponents:[NSArray arrayWithObjects:dir, name, nil]];

    BOOL ok = [[NSFileManager defaultManager] createFileAtPath:path contents:nil attributes:nil];

    if (!ok) {
        NSLog(@"Error creating file %@", path);
    } 
    else {
        NSFileHandle* myFileHandle = [NSFileHandle fileHandleForWritingAtPath:path];
        [myFileHandle writeData:UIImagePNGRepresentation(image)];
        [myFileHandle closeFile];
    }
    return ok;
}

名称通常是下载图像的网址。

the name is usually the url of where the image was downloaded.

文件名长度有限制吗？你知道有时网址可能超长...

is there a constraint on the length of the file name? you know sometimes urls may be super long...

谢谢你

推荐答案

查看syslimits.h中的PATH_MAX常量：91

Taking a look at the PATH_MAX constant in syslimits.h:91

... 
#define PATH_MAX         1024   /* max bytes in pathname */
...

您可以自己测试一下通过这样做：

You can test this yourself by doing :

NSLog(@"%i", PATH_MAX);

只是为了确保。

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