文件未显示在文档目录中？

发布于 2024-10-22 22:12:53 字数 1058 浏览 2 评论 0原文

我想将 PDF 下载到我的文档目录中。我这样做：

- (IBAction)grabURLInBackground:(id)sender
{

    NSURL *url = [NSURL URLWithString:@"http://www.test.com/test.pdf"];
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setDownloadDestinationPath:[self documentsDirectory]];
    [request setDelegate:self];
    [request startAsynchronous];

}

- (void)requestFinished:(ASIHTTPRequest *)request
{

    NSLog(@"requestFinished");
    NSError *error; 

    NSArray *array = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[self documentsDirectory] error:&error];
    if (array == nil) {
       NSLog(@"array == nil");
    }
    NSLog(@"Array count: %d", [array count]);

}

- (NSString *)documentsDirectory { 
    NSArray *paths = 
    NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 
                                        NSUserDomainMask, 
                                        YES); 
    return [paths objectAtIndex:0]; 
}

但我的数组总是空的，我不知道为什么......

它现在可以工作，创建了一个新项目并且它可以工作。有点奇怪。

原文

I want do download a PDF to my documents directory.
I do it like this:

- (IBAction)grabURLInBackground:(id)sender
{

    NSURL *url = [NSURL URLWithString:@"http://www.test.com/test.pdf"];
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setDownloadDestinationPath:[self documentsDirectory]];
    [request setDelegate:self];
    [request startAsynchronous];

}

- (void)requestFinished:(ASIHTTPRequest *)request
{

    NSLog(@"requestFinished");
    NSError *error; 

    NSArray *array = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[self documentsDirectory] error:&error];
    if (array == nil) {
       NSLog(@"array == nil");
    }
    NSLog(@"Array count: %d", [array count]);

}

- (NSString *)documentsDirectory { 
    NSArray *paths = 
    NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 
                                        NSUserDomainMask, 
                                        YES); 
    return [paths objectAtIndex:0]; 
}

But my array is always empty, I don't know why...

It works now, made a new project and it works.
A bit weird.

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浅唱々樱花落 2024-10-29 22:12:53

发生这种情况是因为编写的代码实际上是用您的文件替换 Documents 目录，而不是将其放入 Documents 目录中。

如果您在 Finder 中查看 Simulator 目录（~/Library/Application Support/iPhone Simulator/4.3/Applications/...），您将看到如下内容：
Documents 目录替换为下载的文件

请注意 Documents 目录的“种类”不再是“文件夹”而是“下载完成后“文档”。

如果您将 .pdf 附加到 Finder 中的文档文件，则它应该是您下载的 PDF。我尝试了你的代码，这就是它为我所做的。您将用下载内容覆盖 Documents 目录。

如果您将显式文件名添加到下载路径，您的代码将起作用。像这样的事情：

NSString *filePath = [[[self documentsDirectory] stringByAppendingPathComponent:@"localFile"] stringByAppendingPathExtension:@"pdf"]];
[request setDownloadDestinationPath:filePath];

如果您查看 HTTPRequest 文档中的示例，您将看到指定了文件路径，而不仅仅是下载目录。

作为旁注，您还应该实现 - (void)requestFailed:(ASIHTTPRequest *)request 委托方法，并在 contentsOfDirectoryAtPath: 数组为nil（在您的 requestFinished: 代码中）。这将使您更容易找到问题所在。

注意：确保在修复代码之前从模拟器中删除该应用程序，否则当您尝试写入该 Documents 目录时会收到错误，因为它现在不再是目录！

This is happening because the code as written is actually replacing the Documents directory with your file instead of putting it in the Documents directory.

If you look in the Simulator directory in the Finder (~/Library/Application Support/iPhone Simulator/4.3/Applications/...), you'll see something like this:
Documents directory replaced with downloaded file

Notice how the "Kind" of the Documents directory is no longer a "Folder" but a "Document" after your download completes.

If you append .pdf to the Documents file in the Finder, it should be your downloaded PDF. I tried your code and that's what it did for me. You are overwriting the Documents directory with your download.

Your code will work if you add an explicit file name to the download path. So something like this:

NSString *filePath = [[[self documentsDirectory] stringByAppendingPathComponent:@"localFile"] stringByAppendingPathExtension:@"pdf"]];
[request setDownloadDestinationPath:filePath];

If you check out the example in the HTTPRequest documentation, you'll see that a file path is specified, and not just a download directory.

As a side note, you should also implement the - (void)requestFailed:(ASIHTTPRequest *)request delegate method and check/print out the NSError when the contentsOfDirectoryAtPath: array is nil (in your requestFinished: code). That would have made it easier for you to track down the issue.

NOTE: Make sure to delete the app from your simulator before you fix your code, or you'll get an error when you try to write to that Documents directory, as it's now no longer a directory!

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国产ˉ祖宗 2024-10-29 22:12:53

我不确定您的 dir 变量来自哪里，但看起来这就是您的问题所在。

您可以像这样正确返回数组：

NSArray *array = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[self documentsDirectory] error:&error];

据我所知，在将数组分配给 *array 之前，您可以正确记录数组，但随后您将使用 dir 变量。也不需要分配 FileManger 对象，因为您可以像分配 *array 时那样简单地使用 [NSFileManger defaultManager] 。

另外，当你说你的数组为空时，你的意思是 nil 并且你的 array == nil 日志正在触发，或者你正在使用 [array count]; 并且它返回0？

I'm not sure where your dir variable is coming from but it looks like this is where your problem lies.

You can return the array correctly like so:

NSArray *array = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[self documentsDirectory] error:&error];

From what i can tell your logging the array correctly before you assign it to *array but then you are using the dir variable. There is also no need to alloc a FileManger object as you can simply use [NSFileManger defaultManager] as you have done when assigning *array.

Also, when you say your array is empty, do you mean nil and your array == nil log is firing, or that you are using [array count]; and it is returning 0?

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