ASIHTTP异步pdf下载

发布于 2024-10-26 06:15:42 字数 782 浏览 0 评论 0原文

如果本地文件不存在，任何人都可以提供或告诉我如何异步下载 PDF。

我的代码如下：

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

完成后，我尝试调用它，

[aWebView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[self documentsDirectory] pathForResource:@"test" ofType:@"pdf"]isDirectory:NO]]];

但它要么崩溃，要么不在我的网络视图中加载任何内容。有什么建议吗？

使用自我文档目录进行编辑

原文

Can anyone please provide or show me how to download a PDF asynchronously if a local file doesnt exist.

My code is as follows:

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

Once it is complete I try and call this

[aWebView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[self documentsDirectory] pathForResource:@"test" ofType:@"pdf"]isDirectory:NO]]];

however it either crashes or doesn't load anything inside my web view.
Any suggestions?

EDIT WITH SELF DOCUMENTSDIRECTORY

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无言温柔 2024-11-02 06:15:42

您需要将文件放在 UIWebView 可访问的某个位置，然后将其指向那里。您没有包含创建 [self DocumentsDirectory] 的方式，并且您只是附加一个字符串，而不是使用临时位置的路径附加。您也没有告诉 ASIHTTPRequest 最终文档使用什么实际文件名，只是将其放入的目录，因此它甚至可能不会被保存。此外，UIWebView加载请求不正确。

以下是如何创建路径来告诉 ASIHTTPRequest 将文件放在哪里。

编辑将临时文件位置更改为 NSCachesDirectory，以便在下载失败且部分数据失败时自动清除

// SAVED PDF PATH
// Get the Document directory
NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
// Add your filename to the directory to create your saved pdf location
NSString *pdfLocation = [documentDirectory stringByAppendingPathComponent:@"test.pdf"];

// TEMPORARY PDF PATH
// Get the Caches directory
NSString *cachesDirectory = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
// Add your filename to the directory to create your temp pdf location
NSString *tempPdfLocation = [cachesDirectory stringByAppendingPathComponent:@"test.pdf"];

// Tell ASIHTTPRequest where to save things:
[request setTemporaryFileDownloadPath:tempPdfLocation];     
[request setDownloadDestinationPath:pdfLocation];

然后，当您的代理收到文件下载完成的通知时，告诉 UIWebView 在哪里再次使用正确的方法找到该文件。

// If you've stored documentDirectory or pdfLocation somewhere you won't need one or both of these lines
NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *pdfLocation = [documentDirectory stringByAppendingPathComponent:@"test.pdf"];

// Now tell your UIWebView to load that file
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:pdfLocation]]];

You need to put your file in some place accessible to the UIWebView and then point it there. You've not included how you're creating [self documentsDirectory] and you're just appending a string rather than using the path append for your temporary location. You're also not telling ASIHTTPRequest what actual file name to use for the final document, just the directory to put it in, so it's likely not even being saved. Additionally, the UIWebView load request is incorrect.

Here's how to create your path for telling ASIHTTPRequest where to put the file.

EDITED to change temporary file location to the NSCachesDirectory instead, so that it will be automatically cleared out if the download fails with partial data

// SAVED PDF PATH
// Get the Document directory
NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
// Add your filename to the directory to create your saved pdf location
NSString *pdfLocation = [documentDirectory stringByAppendingPathComponent:@"test.pdf"];

// TEMPORARY PDF PATH
// Get the Caches directory
NSString *cachesDirectory = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
// Add your filename to the directory to create your temp pdf location
NSString *tempPdfLocation = [cachesDirectory stringByAppendingPathComponent:@"test.pdf"];

// Tell ASIHTTPRequest where to save things:
[request setTemporaryFileDownloadPath:tempPdfLocation];     
[request setDownloadDestinationPath:pdfLocation];

Then when your delegate receives notification of the file download being complete, tell the UIWebView where to find the file, again using the proper methods.

// If you've stored documentDirectory or pdfLocation somewhere you won't need one or both of these lines
NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *pdfLocation = [documentDirectory stringByAppendingPathComponent:@"test.pdf"];

// Now tell your UIWebView to load that file
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:pdfLocation]]];

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