如何从webBrowser控件保存图像 [英] How to Save Image from webBrowser Control

问题描述

大家好

我想在没有用户交互的情况下将图像从webBrowser控件保存到硬盘（仅限程序）。而且我不想使用WebClient或System :: Net :: WebRequest类，如果我使用这些类，我必须下载图像两次（一次在
webBrowser控件中，另一次在类中）

I'm tring to save images from webBrowser control to hard disk without a user interaction(by programm only). And I do not want to Use WebClient or System::Net::WebRequest classes becouse, if i use these classes i have to download the image twice (once in webBrowser control and another in classes)

我搜索并找到以下代码

using namespace System::Drawing; 

using namespace System::Runtime::InteropServices; 

 

[ComImport, InterfaceType(ComInterfaceType::InterfaceIsIUnknown), Guid("3050F669-98B5-11CF-BB82-00AA00BDCE0B")] 

interface class IHTMLElementRenderFixed 

{ 

 void DrawToDC([In]IntPtr hdc); 

 void SetDocumentPrinter([In, MarshalAs(UnmanagedType::BStr)]String^ bstrPrinterName, [In]IntPtr hdc); 

}; 

 

... 

 

mshtml::HTMLDocument^ doc = safe_cast<mshtml::HTMLDocument^>(webbrowser->Document); 

mshtml::IHTMLElementCollection^ collImages = doc->getElementsByTagName(L"img"); 

 

for (int i = 0; i < collImages->length; ++i) 

{ 

 mshtml::IHTMLImgElement^ img = safe_cast<mshtml::IHTMLImgElement^>(collImages->item(nullptr, i)); 

 IHTMLElementRenderFixed^ render = safe_cast<IHTMLElementRenderFixed^>(img); 

 

 Bitmap^ bmp = gcnew Bitmap(img->width, img->height); 

 Graphics^ g = Graphics::FromImage(bmp); 

 IntPtr hdc = g->GetHdc(); 

 render->DrawToDC(hdc); 

 g->ReleaseHdc(hdc); 

 delete g; 

 

 Image^ existing = pictureBox1->Image; 

 pictureBox1->Image = bmp; 

 delete existing; 

 MessageBox::Show(L"pause so you can see the picture"); 

} 

推荐答案

请查找示例代码

private   void   Form1_Load（ object
  sender，  EventArgs  e） 

        private  void  Form1_Load(object  sender, EventArgs e)  

        {  

this .webBrowser1.Navigate（" http：//www.microsoft.com"
）; 

            this .webBrowser1.Navigate("http://www.microsoft.com" );  

        }  

 

private   void   button1_Click（ object
  sender，  EventArgs  e） 

        private  void  button1_Click(object  sender, EventArgs e)  

        {  

new   System.Net.WebClient（）;
 

            System.Net.WebClient wc = new  System.Net.WebClient();  

this .webBrowser1.Document.GetElementsByTagName（" img"
）; 

            HtmlElementCollection imgs = this .webBrowser1.Document.GetElementsByTagName("img" );  

 

for  （ int   i  =  0;  i <  imgs.Count;  i ++）
 

            for  (int  i = 0; i < imgs.Count; i++)  

            {  

" src"
），  " c：\\ images"   +  i.ToString（）  +  " .jpg" ）; 

                wc.DownloadFile(imgs[i].GetAttribute("src" ), "c:\\images"  + i.ToString() + ".jpg" );  

            }  

< span style ="font-size：9pt; font-family：" Courier New"        } 

        } 

如果它对您有用，请标记为答案。

有关免费源代码，请访问
http://sourcecode-world.blogspot.com/

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