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我正在开发IE8 BHO插件.现在,我只是想将文本插入另一个iframe(id =“ canvas_frame”)所包含的iframe(class =“ Al Ai Editable”)中.
我设法获得了要向其添加文本的iframe的IHTMLElement(class =“ Al Ai editable”).我可以通过类型为IHTMLElement的el变量来证明这一点：
el->get_className(&cl); //Al Ai editable
在MessageBox中正确显示iframe的类.
我现在遇到的问题是我无法访问相应iframe的body元素.
例如,当我尝试使用以下代码访问带有ID的iframe主体时,这将导致浏览器崩溃：
el->getElementById(L":d6", &el); // ":d6" is the id of the body inside the iframe
另外,尝试获取内部HTML或内部Text,我只是获得一个空字符串：
el->get_innerHTML(&htm);
MessageBox(hwnd, htm, L"BHO cl", MB_OK);
要么
el->get_innerText(&htm);
MessageBox(hwnd, htm, L"BHO cl", MB_OK);
不显示任何内容(“”).
我什至尝试了el-> get_children方法,但这也没有帮助.
这是整个功能：
void CgmailAdderBHO::checkIframes(HWND hwnd, IDispatch *lpDisp) {
USES_CONVERSION;
if (lpDisp) {
IOleContainer* pContainer;
// Get the container
HRESULT hr = lpDisp->QueryInterface(IID_IOleContainer,
(void**)&pContainer);
lpDisp->Release();
if (FAILED(hr)) {
return;
}
IEnumUnknown* pEnumerator;
// Get an enumerator for the frames
hr = pContainer->EnumObjects(OLECONTF_EMBEDDINGS, &pEnumerator);
pContainer->Release();
if (FAILED(hr)) {
return;
}
IUnknown* pUnk;
ULONG uFetched;
// Enumerate and refresh all the frames
for (UINT i = 0; S_OK == pEnumerator->Next(1, &pUnk, &uFetched); i++)
{
IWebBrowser2* pBrowser;
hr = pUnk->QueryInterface(IID_IWebBrowser2, (void**)&pBrowser);
pUnk->Release();
if (SUCCEEDED(hr))
{
// process the iframe
CComPtr docDisp;
pBrowser->get_Document(&docDisp);
CComQIPtr doc = docDisp;
CComQIPtr iframes;
HRESULT hr = doc->getElementsByTagName(SysAllocString(L"body"), &iframes);
long length;
iframes->get_length(&length);
CComVariant itemIndex(0);
CComVariant empty;
CComQIPtr htmlEl;
iframes->item(itemIndex, empty, &htmlEl);
CComQIPtr el = htmlEl;
BSTR cl;
BSTR cln(L"cP");
el->get_className(&cl);
if (cl && strcmp(OLE2A(cl), "cP") == 0) {
//this is the canvas_frame
// check if it has any other subframes
BSTR html;
el->get_innerHTML(&html);
doc->getElementsByTagName(SysAllocString(L"iframe"), &iframes);
if (iframes) {
iframes->get_length(&length);
if (length > 0) {
//MessageBox(hwnd, L"We are on compose!", L"BHO", MB_OK);
//add encrypt button code here
iframes->item(itemIndex, empty, &htmlEl);
el = htmlEl;
el->get_className(&cl); //Al Ai editable
BSTR htm;
el->get_innerHTML(&htm);
MessageBox(hwnd, cl, L"BHO cl", MB_OK);
MessageBox(hwnd, htm, L"BHO cl", MB_OK);
CComQIPtr docul = htmlEl;
//docul->getElementById(L":d6", &el);
break; // found iframe ; now exit for
}
}
}
pBrowser->Release();
}
}
pEnumerator->Release();
}
}