MFC OCX 事件 / 屬性 / 接口參數相關小結
1、事件
1.1 事件的添加
控件的事件一般都是由對外的接口引發。事件應該是屬於窗口的,所以在Ctrl類上單擊右鍵-》添加。
事件函數的名字就是事件名稱,參數就是在添加事件時候設置的參數。控件裏邊通過參數將結果給了事件函數,從而將值傳出。
參考鏈接:http://blog.csdn.net/wd_cloud/article/details/40893033
1.2 子線程中事件的觸發傳出
//define a custom message:
a) #define WM_THREADFIREEVENT WM_USER+101
b) ON_MESSAGE(WM_THREADFIREEVENT,OnFireEventForThread) //custom handler
c) LRESULT CFireeventCtrl::OnFireEventForThread(WPARAM wParam, LPARAM lParam)
{
FireLengthyProcessDone();
return TRUE;
}
d) 線程內:PostMessage(pCtrl->m_hWnd, WM_THREADFIREEVENT, (WPARAM)NULL, (LPARAM)NULL);
上述的hWnd,如果在IE使用空間,這個窗口句柄是空的,會導致回調照樣失敗,這時候需要重載OnSetClientSize。
e) void CMyControl::OnSetClientSite()
{
// It doesn‘t matter who the parent window is or what the size of
// the window is because the control‘s window will be reparented
// and resized correctly later when it‘s in-place activated.
VERIFY (CreateControlWindow (::GetDesktopWindow(), CRect(0,0,0,0), CRect(0,0,0,0)));
COleControl::OnSetClientSite();
}
參考鏈接:http://www.cnblogs.com/lidabo/archive/2012/12/12/2815059.html
https://support.microsoft.com/en-us/help/200839/how-to-enable-activex-control-event-handling-on-a-web-page
2、接口參數
2.1 byte[]數組的傳遞:SAFEARRAY - > VARIANT
///將圖像內存數據封裝為接口需要的VARIANT類型 VARIANT pImgBuffer; SAFEARRAY *psa = NULL; SAFEARRAYBOUND rgsabound; VariantInit(&pImgBuffer); rgsabound.cElements = bytes; rgsabound.lLbound = 0; psa = SafeArrayCreate(VT_UI1, 1, &rgsabound); if ( psa == NULL ) return; BYTE *pBitmapData = NULL; //new BYTE[bytes];(不需要new) SafeArrayAccessData(psa, (void **)&pBitmapData); memcpy(pBitmapData, tempBuffer, bytes); ///將SAFEARRAY放入VARIANT中,並設置類型 pImgBuffer.vt = VT_ARRAY | VT_UI1; SafeArrayCopy(psa, &pImgBuffer.parray); SafeArrayUnaccessData(psa); //這裏也就不需要使用delete釋放pBitmapData所指向的空間 //YOUR_INTERFACE(pImgBuffer/*VARIANT*/, img.GetHeight(), img.GetWidth()); if ( tempBuffer ) delete[] tempBuffer; tempBuffer = NULL; SafeArrayDestroy(psa);c++調用中參數封裝
//VARIANT* pPixArray;(接口參數) unsigned char* pBuffer = NULL; SafeArrayAccessData(pPixArray.parray, (void**)&pBuffer); ///此處使用pBuffer所指向的數據 SafeArrayUnaccessData(pPixArray.parray); HRESULT ret = VariantClear(&pPixArray);ocx接口內實現
FileInfo fi = new FileInfo("GrayPixelsBuf"); byte[] buf = new byte[fi.Length]; FileStream fs = fi.OpenRead(); fs.Read(buf, 0, Convert.ToInt32(fs.Length)); fs.Close(); ////buf傳遞給ocx////////c#中數據傳遞
參考鏈接:http://blog.csdn.net/xdg_blog/article/details/53169852
MFC OCX 事件 / 屬性 / 接口參數相關小結