[英]how to host html control in my window using a buffer which contents a html file
我正在開發視覺c ++應用程序(x64)。 我實際上想做的是,假設我們在資源管理器中有一個html文件(我的意思是文件擴展名為“ .html”的文件)。 當我們單擊它時,將在預覽窗格中獲得其預覽(因此,我們無需打開此文件,只需單擊一個文件即可在預覽窗格中看到該文件)。
我已經開發了類似類型的應用程序,但是在我的情況下,當我單擊“ html文件”時,我只是在預覽窗格中獲得了該html文件的代碼(如果在記事本中打開該html文件,則可以看到該代碼)。 預計不會發生,但我想預覽該“ html文件”而不是該html文件的代碼。
我認為我需要托管一些瀏覽器控件,該控件會將預覽窗格中的html代碼轉換為html文件的顯示(如果我是正確的???),該怎么辦?
這是我的代碼-
IHTMLDocument2 * pDoc=NULL;
HRESULT hr2 = CoCreateInstance(CLSID_HTMLDocument, NULL, CLSCTX_INPROC_SERVER, IID_IHTMLDocument2, (LPVOID *) &pDoc);
if (pDoc)
{
IPersistStreamInit *pPersist = NULL;
pDoc->QueryInterface(IID_IPersistStreamInit,(LPVOID *) &pPersist);
if (pPersist)
{
IMarkupServices *pMS = NULL;
pPersist->InitNew();
pPersist->Release();
pDoc->QueryInterface(IID_IMarkupServices,(LPVOID *) &pMS);
if (pMS)
{
IMarkupContainer *pMC = NULL;
IMarkupPointer *pMkStart = NULL;
IMarkupPointer *pMkFinish = NULL;
pMS->CreateMarkupPointer(&pMkStart);
pMS->CreateMarkupPointer(&pMkFinish);
pMS->ParseString(HtmlFileContents,0,&pMC,pMkStart,pMkFinish);
//this HtmlFileContents is actually a buffer of olechar type which contains the code of html file (the code which you see when you open the html file in notepad)
if (pMC)
{
IHTMLDocument2 *pNewDoc = NULL;
pMC->QueryInterface(IID_IHTMLDocument,(LPVOID *) &pNewDoc);
if (pNewDoc)
{
IHTMLElement *pBody;
pNewDoc->get_body(&pBody);
if (pBody)
{
BSTR strText;
pBody->get_innerText(&strText);
hr = instance->CreatePreviewWindowForHtml(strText); // this function is responsible for displaying the html file in window. you can see its definition below after this code.
SysFreeString(strText);
pBody->Release();
}
pNewDoc->Release();
}
pMC->Release();
}
if (pMkStart)
pMkStart->Release();
if (pMkFinish)
pMkFinish->Release();
pMS->Release();
pMS->Release();
}
}
pDoc->Release();
}
return true;
and the function defintion of CreatePreviewWindowForHtml() is as below-
CreatePreviewWindowForHtml(PCWSTR pszRtfWide)
{
assert(m_hwndPreview3 == NULL);
HRESULT hr = E_FAIL;
if (m_hwndPreview3 == NULL)
{
HRESULT hr5 = HRESULT_FROM_WIN32(GetLastError());
}
if (m_hinstEditLibrary == NULL)
{
// MSFTEDIT_CLASS used below comes from this binary
m_hinstEditLibrary = LoadLibraryW(L"msftedit.dll");
}
if (m_hinstEditLibrary == NULL)
{
hr = HRESULT_FROM_WIN32(GetLastError());
}
else
{
// Create the preview window
HWND pr = m_hwndPreview3 = CreateWindowExW(0, MSFTEDIT_CLASS, NULL,
WS_CHILD | WS_VSCROLL | WS_VISIBLE | ES_MULTILINE | ES_READONLY, // Always create read-only
m_rcParent.left, m_rcParent.top, RECTWIDTH(m_rcParent), RECTHEIGHT(m_rcParent),
m_hwndPreview, NULL, NULL,NULL);
if (m_hwndPreview3 == NULL)
{
MessageBoxA(m_hwndPreview3,strerror(hr),"BTN WND2", MB_ICONINFORMATION);
}
else
{
int const cchRtf = 1 + wcslen(pszRtfWide);
PSTR pszRtf = (PSTR)CoTaskMemAlloc(cchRtf);
if (pszRtf)
{
WideCharToMultiByte(CP_ACP, 0, pszRtfWide, cchRtf, pszRtf, cchRtf, NULL, NULL);
SETTEXTEX st = { ST_DEFAULT, CP_ACP };
LRESULT hr4=SendMessage(m_hwndPreview3, EM_SETTEXTEX, (WPARAM) &st, (LPARAM) pszRtfWide);
if (SUCCEEDED(hr4))
{
hr = AdjustDialogPositionAndSize();
SendMessage(m_hwndPreview3, EM_SETTEXTEX, (WPARAM) &st, (LPARAM) pszRtfWide);
}
CoTaskMemFree(pszRtf);
hr = S_OK;
}
else
{
hr = E_OUTOFMEMORY;
}
}
}
return hr;
}
為什么我的窗口中有html代碼的任何想法? 為了在我的窗口而不是html代碼中預覽html文件,在代碼中做什么? 如果對我有任何疑問,請告訴我?
您的窗口中有html代碼,因為您選擇了richedit作為文本渲染器,並且文本的開頭不是“ {\\ rtf”。
如果要顯示html,則需要html渲染器而不是豐富的編輯,例如MFC的CHtmlEditCtrl。 如果您不想使用MFC,則可以編寫ActiveX容器直接托管Webbrowser控件 。
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