|
I need to implement a window that is suitable for things like a combo box's dropdown window, or a menu.
- I want it to popup (be top most) with out recv'ing focus.
- I want it to ignore mouse activates
- I want it to be closed when a WM_LBUTTONUP is recv'd by the window, OR a WM_LBUTTONDOWN happens on ANY other window.
I have items 1 and 2 working fine. However I'm not sure of the best way to implement the third one. Is installing a windows hook the best way? If so, which hook type do I want? There is a specific mouse hook type, but it doesn't look your call back gets enough info - i.e. you can't tell if it's a mouse down, etc.
|
|
|
|
|
Dear All;
I want to capture a screen shot of a web browser control (m_webBrowser) which is hosted in a dialog box.
Here is the code which i used to do that but its not working properly (ie. capturing other windows) !
<br />
RECT rc;<br />
LPOLEWINDOW pOWin = 0;<br />
HWND hWnd;<br />
m_webBrowser.GetControlUnknown()->QueryInterface(IID_IOleWindow, (LPVOID*)&pOWin);<br />
pOWin->GetWindow(&hWnd);<br />
HWND hwFirst = ::GetWindow( hWnd, GW_CHILD );<br />
HWND hwSecond = ::GetWindow( hwFirst, GW_CHILD );<br />
::GetWindowRect (hwSecond,&rc); <br />
HDC hDC = ::GetDC(0);<br />
HDC memDC = ::CreateCompatibleDC ( hDC );<br />
HBITMAP memBM = ::CreateCompatibleBitmap ( hDC, rc.right-rc.left, rc.bottom-rc.top );<br />
::SelectObject ( memDC, memBM );<br />
::BitBlt( memDC, rc.left, rc.top, rc.right-rc.left, rc.bottom-rc.top , hDC, 0, 0 , SRCCOPY );<br />
<br />
int size = 3 * ( (rc.right-rc.left) * (rc.bottom-rc.top) );<br />
BYTE *lpBits = new BYTE[size];<br />
<br />
::GetBitmapBits( memBM, size, lpBits );<br />
<br />
char* imageName;<br />
imageName =(char*)"2.jpg";<br />
SaveBitmap(imageName, memBM);
<br />
delete [] lpBits;<br />
::DeleteObject(memBM);<br />
::DeleteObject(memDC);<br />
::ReleaseDC( 0, hDC )<br />
Can someone please help me? Thank you
llp00na
|
|
|
|
|
Maybe you need to use EnumChildWindows() instead of GetWindow() to find the appropriate window.
Just a guess since I have no idea what your window hierarchy looks like 
Mark
"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")
|
|
|
|
|
thanx for your reply;
I only have a dialog box (main window) which hosts the webBrowser control.
llp00na
|
|
|
|
|
So where is this code being called from?
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
|
|
|
|
|
The code is being called from a button click handler. (The user clicks a button "Grab Screen").
llp00na
|
|
|
|
|
llp00na wrote: The code is being called from a button click handler.
Then just use the web control's GetWindowRect() method (instead of calling GetWindow() twice).
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
|
|
|
|
|
I have tried what you suggested but it stil gives me the same result (ie. similar to the one i got when i called getWindow() twice)
It grabs part of the MVStudio, part of the dialog which hosts the web browser and the remaining of the screen shot is painted in black.
Any other ideas would be appreciated
llp00na
|
|
|
|
|
Continuing from Mr Crow's question...
...and which window's pixels is it grabbing?
Mark
"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")
|
|
|
|
|
its grabbing part of the Microsoft VC++, parts of the dialog window (and not the web browser at all). The remaining of the screenshot is all black.
llp00na
|
|
|
|
|
The black is probably because the bitmap bits size (in bytes) is calculated wrong.
Try something like
BITMAP bitmap;
::GetObject(memBM, sizeof(BITMAP), &bitmap);
long size = bitmap.bmWidthBytes * bitmap.bmHeight;
BYTE *lpBits = new BYTE[size];
...
or
BITMAP bitmap;
::GetObject(memBM, sizeof(BITMAP), &bitmap);
long size = (((bitmap.bmWidth * (long)bmBitsPixel + 15L) & (~15L)) / 8L) * bitmap.bmHeight;
BYTE *lpBits = new BYTE[size];
...
"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")
|
|
|
|
|
I have tried your suggestions and i still have the same problem. No difference what so ever !
llp00na
|
|
|
|
|
Sorry I should have looked more closely at your code.
Try changing your BitBlt() call from
::BitBlt( memDC, rc.left, rc.top, rc.right-rc.left, rc.bottom-rc.top , hDC, 0, 0 , SRCCOPY );
to
::BitBlt( memDC, 0, 0, rc.right-rc.left, rc.bottom-rc.top , hDC, rc.left, rc.top , SRCCOPY );
"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")
|
|
|
|
|
Oh thanx so much man, you are a genius;).
your code captures a screen shot of the visible area of the web browser. Do you know how to capture all area of the web browser -including the invisible parts (That is when the user has to scroll down to view the rest of the page). Because this is when i need to do.
llp00na
|
|
|
|
|
Since your grabbing pixels from the display, you won't be able to get the non-visible pixels
that way.
Maybe there's an overridable method in the browser control where you can force the HTML to be
rendered to a dc of your choice instead of the screen...?
Mark
"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")
|
|
|
|
|
I was thinking if i can get a handle of the web browser then it should be possible to capture all area of the web browser. Do you know how to retrieve the handle of the web browser?
llp00na
|
|
|
|
|
Hello,
I am a newbie with VC++ and MFC and I try to understand how CTreeCtrl works.
Could you please tell me how to use lparam in TVITEM.
I've found nothing in the MSDN and I also searched in this forum. I've read that someone used it to store a LPSTR.
Does it mean that I can use it to store my own types such pointers, structures etc..?
many thanks for your help.
|
|
|
|
|
Arris7 wrote: Does it mean that I can use it to store my own types such pointers, structures etc..?
Yes, you can do it.
In our case, in the tree, each leaf points to its corresponding object via the pointer that is stored in the lparam member of the TVITEM :
In this example, when I insert a leaf in the tree, I will assing the pointer to lparam, you must not forget to add the TVIF_PARAM to the mask. ( note that the TVITEM in this case is a member of the TVINSERTSTRUCT struct )
TVINSERTSTRUCT tv;
ZeroMemory (&tv, sizeof ( tv ) );
tv.hParent = hParent;
tv.hInsertAfter = TVI_LAST;
tv.item.mask = 0;
tv.item.mask = TVIF_IMAGE | TVIF_SELECTEDIMAGE | TVIF_TEXT | TVIF_PARAM;
tv.item.iImage = IMAGE_INDEX;
tv.item.iSelectedImage = IMAGE_INDEX;
tv.item.pszText = (LPTSTR)(LPCTSTR)sText;
tv.item.lParam = (DWORD)pPointerToObject;
HTREEITEM h = InsertItem( &tv );
|
|
|
|
|
Thnks for your explanation Maximilien, it sounds clear now.
please copuld you answer a last question before I go on into coding.
I use the following structure that will contain additional information related to my leaves
struct NodeInfo
{
CString Path;
CString GroupName;
CString Type;
DWORD Category;
};
so if I want to attach this structure to my leaf, can I write
tv.item.lParam = NodeInfo* moreinfo;
or is it better to write
NodeInfo* moreinfo = new NodeInfo; // Do not forget to delete
tv.item.lParam = moreinfo;
Thnks again for your help
|
|
|
|
|
I need to be able to dynamically change the font (and/or image )of different leaves in my tree.
The problem is that one "leaf" can be in different places in the tree ( have different parents ); and I don't want to spend all of my computing time finding the HTREEITEM of those leaves.
So, one of my solution is to "custom draw" the items and change the font, the followinf works well except that the item width is not modified to take into account the width of the string with the bold font ( the item is slightly clipped )
void MyTree::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult)
{
NMTVCUSTOMDRAW *pcd = (NMTVCUSTOMDRAW *)pNMHDR;
switch ( pcd->nmcd.dwDrawStage )
{
case CDDS_PREPAINT:
*pResult = CDRF_NOTIFYITEMDRAW;
break;
case CDDS_ITEMPREPAINT :
{
if ( someCondition )
{
::SelectObject(pcd->nmcd.hdc, m_fontBold.GetSafeHandle());
}
else
{
::SelectObject(pcd->nmcd.hdc, m_font.GetSafeHandle());
}
*pResult = CDRF_DODEFAULT;
break;
}
}
}
The other thing I tried was to change the image of the leaf :
void MyTree::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult)
{
NMTVCUSTOMDRAW *pcd = (NMTVCUSTOMDRAW *)pNMHDR;
switch ( pcd->nmcd.dwDrawStage )
{
case CDDS_PREPAINT:
*pResult = CDRF_NOTIFYITEMDRAW;
break;
case CDDS_ITEMPREPAINT :
{
if ( someCondition )
{
SetItemImage( hItem, IMAGE_INDEX_1, IMAGE_INDEX_1 );
}
else
{
SetItemImage( hItem, IMAGE_INDEX, IMAGE_INDEX );
}
*pResult = CDRF_DODEFAULT;
break;
}
}
}
The following works, except that the paint is retriggered, and the process eats CPU (all the CPU).
2 questions for now :
- If I only change the font, is there a way to "reset" the item size so it does not look clipped ?
- Is there a way to use custom draw ( that I missed ) that would not retrigger redraw if I change the image like I'm doing ?
Any other suggestions, hints or tips ?
Many Thanks
Max.
|
|
|
|
|
how to change the text color of the radio button at run time.
Arise Awake Stop Not Till ur Goal is Reached.
|
|
|
|
|
MSDN[^] is your best friend.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
|
|
|
|
|
See WM_CTLCOLORBTN
And see a little help 
HBRUSH CDialogDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
pDC->SetTextColor(RGB(20,120,220));
return hbr;
}
|
|
|
|
|
Hi,
Whats the purpose of having foll.. statments in an header file
//car.hpp
#ifndef CAR_HPP
#define CAR_HPP
class Car
{
};
#endif
VIBIN
"Fool's run away,where angle's fear to tread"
|
|
|
|
|
To avoid having the symbols declared multiple times.
Suppose you have a file that include two other header files (file A.h and file B.h). These two files both include a third one (C.h).
If you didn't have the include guards, the symbols would be duplicated because your file is included both from A.h and from B.h. (For the preprocessor, an include will simply replace the include statement by the contents of the file).
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
