当webview上的页面是pdf文件时,我正在尝试启动pdf应用程序查看器,但我找不到如何制作这个,是否可能?
答案 0 :(得分:1)
如果您不熟悉Async,请阅读以下文章: MSDN Asynchronous Programming with Async and Await
我无法测试我的应用,因为我的WP8手机目前无法使用,我无法在模拟器上安装PDF阅读器。
请致电以下方法开始下载
WebClient pdfDownloader = null;
string LastFileName = ""; //To save the filename of the last created pdf
private void StartPDFDownload(string URL)
{
pdfDownloader = new WebClient(); //prevents that the OpenReadCompleted-Event is called multiple times
pdfDownloader.OpenReadCompleted += DownloadPDF; //Create an event handler
pdfDownloader.OpenReadAsync(new Uri(URL)); //Start to read the website
}
async void DownloadPDF(object sender, OpenReadCompletedEventArgs e)
{
byte[] buffer = new byte[e.Result.Length]; //Gets the byte length of the pdf file
await e.Result.ReadAsync(buffer, 0, buffer.Length); //Waits until the rad is completed (Async doesn't block the GUI Thread)
using (IsolatedStorageFile ISFile = IsolatedStorageFile.GetUserStoreForApplication())
{
try
{
LastFileName = "tempPDF" + DateTime.Now.Ticks + ".pdf";
using (IsolatedStorageFileStream ISFileStream = ISFile.CreateFile(LastFileName))
{
await ISFileStream.WriteAsync(buffer, 0, buffer.Length);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message + Environment.NewLine + ex.HResult,
ex.Source, MessageBoxButton.OK);
//Catch errors regarding the creation of file
}
}
OpenPDFFile();
}
private async void OpenPDFFile()
{
StorageFolder ISFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
try
{
IStorageFile ISFile = await ISFolder.GetFileAsync(LastFileName);
await Windows.System.Launcher.LaunchFileAsync(ISFile);
//http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj206987%28v=vs.105%29.aspx
}
catch (Exception ex)
{
//Catch unknown errors while getting the file
//or opening the app to display it
}
}
要从WebBrowser-Control调用这些方法,您需要捕获导航事件。
YourWebBrowserControl.Navigating += YourWebBrowserControl_Navigating;
void YourWebBrowserControl_Navigating(object sender, NavigatingEventArgs e)
{
if(e.Uri.AbsolutPath.EndsWith("pdf"))
{
StartPDFDownload(e.Uri.ToString());
}
}
不要忘记你必须删除有一天创建的文件。