如何捕获IE的屏幕，大家讨论

wqvbka123 2010-01-19 02:27:53

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本人打算根据http://www.codeproject.com/KB/IP/htmlimagecapture.aspx 的方法改造成捕抓IE窗口的屏幕，然后保存图片，现在已经可以根据窗口句柄得到 IHTMLDocument2 然后通过它获获得 IHTMLElementRender 总是失败。返回结果是E_NOINTERFACE

代码如下：
HRESULT hr = pElement->QueryInterface(IID_IHTMLElementRender, (void **) &pRender);
//hr此时总为 E_NOINTERFACE
if (pRender == (IHTMLElementRender *) NULL)
return FALSE;

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efabc 2010-02-06

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[Quote=引用 4 楼 mic_lee2000 的回复:]
下面的代码肯定能用，也一定好用：
// 创建WebBrowser屏幕快照
HBITMAP CWebBrowser::CreateSnapShot()
{
IHTMLDocument2* pDoc = this->get_Document();
if(NULL == pDoc)
return NULL;

CComPtr <IHTMLDocument2> spDoc(pDoc);
pDoc->Release();
if(NULL == spDoc)
return NULL;

HRESULT hr;

CComPtr <IViewObject> spViewObject = NULL;
hr = spDoc->QueryInterface(IID_IViewObject,(void **)&spViewObject);
if(FAILED(hr) || NULL == spViewObject)
return NULL;

// get WebBrowser device context
HDC wndDC = ::GetWindowDC(this->m_hWnd);
HDC dc = ::CreateCompatibleDC(wndDC);

RECT rect;
GetWindowRect(&rect);
HBITMAP hBitmap = ::CreateCompatibleBitmap(wndDC,rect.right - rect.left,rect.bottom - rect.top);
if(NULL == hBitmap)
return NULL;

Gdiplus::Bitmap* bmp = Gdiplus::Bitmap::FromHBITMAP(hBitmap,NULL);
HGDIOBJ hobj = ::SelectObject(dc,(HGDIOBJ)hBitmap); // Select the Snapshot bitmap object;hobj

try
{
::Gdiplus::Graphics* g = ::Gdiplus::Graphics::FromHDC(dc);
g->Clear(Gdiplus::Color(255,255,255));
delete g;
g = NULL;

RECTL rectl;
rectl.top = 0;
rectl.left = 0;
rectl.right = rect.right - rect.left;
rectl.bottom = rect.bottom - rect.top;

DVASPECTINFO info;
info.cb = sizeof(info);
info.dwFlags = DVASPECTINFOFLAG_CANOPTIMIZE;
// draw screen snapshot.
hr = spViewObject->Draw(DVASPECT_CONTENT,-1,
&info,NULL,NULL,dc,&rectl,&rectl,NULL,0);
}
catch(...)
{
ATLTRACE2(atlTraceCOM,2,_T("create a webbrowser thumb failed...."));
}

::SelectObject(dc,hobj);
::DeleteDC(dc);

return hBitmap;
}
[/Quote]

这个代码,怎么实现保存图片. ?

t86591648 2010-02-02