Implementing the “Font” feature like the one in INTERNET EXPLORER

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A sample code to change the fonts in your web browser using webbrowser control.

void CMyBrowser::SetFont(int nFontSize)
{	m_pDisp = NULL; 			// IDISPATCH pointer
	LPOLECOMMANDTARGET pCmdTarg = NULL;

	m_pDisp = m_WebBrowser2.GetDocument(); 	// get the idispatch pointer from webbrowser control
	ASSERT(m_pDisp); 			//check for validity

	m_pDisp->QueryInterface(IID_IOleCommandTarget, (LPVOID*)&pCmdTarg); //query for IID_IOleCommandTarget interface 
	ASSERT(pCmdTarg); 			// check for validity

	VARIANT vaFontSize;   			// input argumentsVariantInit(&vaFontSize);
	V_VT(&vaFontSize) = VT_I4;
	V_I4(&vaFontSize) = nFontSize;  	//size of the font you want
	VARIANT vaFontOutput;

	pCmdTarg->Exec(NULL,			// execute just change the font
		       OLECMDID_ZOOM,
		       OLECMDEXECOPT_PROMPTUSER,
		       &vaFontSize,
		       &vaFontOutput);

	VariantClear(&vaFontSize); 		//clear the variant variable before freeing its memory

	if (pCmdTarg)   pCmdTarg->Release(); 	// release document's command target
	if (m_pDisp)   m_pDisp->Release();    	// release document's dispatch interface
}

Updated on May 18 1998