I have some trouble drawing an ActiveX control. In the screenshot below you see the control after a resize in the VB6 IDE. The control's outline from before the resize is still shown on the left-hand side of the control:
Here is the code that draws a black ellipsis with a red Z:
void CzFileIoXCtrl::OnDraw(CDC* pdc,
const CRect& rcBounds,
const CRect& rcInvalid)
{
if (!pdc)
{
return;
}
pdc->SetBkMode(TRANSPARENT);
pdc->SelectObject(CBrush::FromHandle((HBRUSH)GetStockObject(BLACK_BRUSH)));
pdc->Ellipse(rcBounds.left, rcBounds.top,
rcBounds.left + rcBounds.Width(),
rcBounds.top + rcBounds.Height());
HFONT font = CreateFont(int(rcBounds.Height() * 0.7),
int(rcBounds.Width() * 0.5),
0, 0, FW_BLACK, FALSE, FALSE, FALSE,
ANSI_CHARSET,
OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS,
CLEARTYPE_QUALITY,
FF_DECORATIVE, NULL);
pdc->SelectObject(font);
pdc->SetTextColor(RGB(255, 0, 0));
DRAWTEXTPARAMS params = { sizeof(DRAWTEXTPARAMS), 1, 0, 0, 1 };
RECT bounds = rcBounds;
CString z(L"Z");
pdc->DrawTextEx(z, &bounds, DT_CENTER | DT_VCENTER | DT_SINGLELINE, ¶ms);
}
How can I clear the drawing area?
I managed to reproduce this in the vb form editor. It looks like the problem comes because you do not draw anything outside the ellipse. So, you can draw a rectangle in the entire area like this before drawing anything in OnDraw().
pdc->FillRect( rcBounds, &CBrush(TranslateColor( AmbientBackColor() )) );
I tested this and is working fine.
Related
I tried to capture a screenshot of specific window using BitBlt and save it to clipboard, but it returns the screenshot with the content inside window border only while the window border itself is remain transparent or blacked out with many weird behaviors.
The expected result should be the full window border with the full content:
This is the actual result:
This is what I tried:
Comment the SetLayeredWindowAttributes function before performing BitBlt but the result is the entire black screenshot.
Tried to set the delay after UpdateWindow function but the weird border remains the same.
Disabling some coded option but it didn't help...
Use PrintWindow but the result is the classic gui border, which is not the intended goal (and many article indicate about the problem with this function).
I don't have any idea why this happened nor able to find out due to lack of information of this command when searching Internet.
Is there anything wrong with my code?
void QuickScreenshot()
{
HWND windowHandle(::FindWindowW(0, L"Internet Download Manager 6.41"));
ANIMATIONINFO AnimationInfo{};
SystemParametersInfoW(SPI_GETANIMATION, sizeof(ANIMATIONINFO), &AnimationInfo, NULL);
auto DefaultAnimationInfo(AnimationInfo);
AnimationInfo.iMinAnimate = 0;
DefaultAnimationInfo.cbSize = sizeof(ANIMATIONINFO);
SystemParametersInfoW(SPI_SETANIMATION, sizeof(ANIMATIONINFO), &AnimationInfo, WM_SETTINGCHANGE);
auto originalExstyle(GetWindowLongW(windowHandle, GWL_EXSTYLE));
SetWindowLongW(windowHandle, GWL_EXSTYLE, WS_EX_LAYERED);
COLORREF windowColor;
BYTE windowAlpha, customAlpha(1);
DWORD flag;
WINDOWPLACEMENT windowState{};
windowState.length = sizeof(WINDOWPLACEMENT);
GetLayeredWindowAttributes(windowHandle, &windowColor, &windowAlpha, &flag);
SetLayeredWindowAttributes(windowHandle, windowColor, customAlpha, flag);
GetWindowPlacement(windowHandle, &windowState);
if (windowState.showCmd == SW_SHOWMINIMIZED)
{
if ((windowState.flags & WPF_RESTORETOMAXIMIZED) == WPF_RESTORETOMAXIMIZED)
{
ShowWindow(windowHandle, SW_MAXIMIZE);
}
else
{
ShowWindow(windowHandle, SW_SHOWNORMAL);
}
}
else
{
ShowWindow(windowHandle, windowState.showCmd);
}
RECT windowRectangleCoordinates;
GetWindowRect(windowHandle, &windowRectangleCoordinates);
InvalidateRect(windowHandle, &windowRectangleCoordinates, TRUE);
UpdateWindow(windowHandle);
Sleep(100);
HDC ScreenContentHandle(GetWindowDC(windowHandle));
HDC DestinationContentHandle(CreateCompatibleDC(ScreenContentHandle));
auto cx(windowRectangleCoordinates.right - windowRectangleCoordinates.left);
auto cy(windowRectangleCoordinates.bottom - windowRectangleCoordinates.top);
HBITMAP BitmapHandle(CreateCompatibleBitmap(ScreenContentHandle, cx, cy));
HGDIOBJ oldObject(SelectObject(DestinationContentHandle, BitmapHandle));
//PrintWindow(windowHandle, ScreenContentHandle, NULL);
BitBlt
(
DestinationContentHandle,
0, 0, cx, cy,
ScreenContentHandle,
0, 0,
SRCCOPY | CAPTUREBLT
);
SaveToClipboard(BitmapHandle);
SelectObject(DestinationContentHandle, oldObject);
DeleteDC(DestinationContentHandle));
ReleaseDC(NULL, ScreenContentHandle));
DeleteObject(BitmapHandle));
ShowWindow(windowHandle, SW_MINIMIZE);
SetLayeredWindowAttributes(windowHandle, windowColor, windowAlpha, flag);
SetWindowLongW(windowHandle, GWL_EXSTYLE, originalExstyle);
SystemParametersInfoW(SPI_SETANIMATION, sizeof(ANIMATIONINFO), &DefaultAnimationInfo, WM_SETTINGCHANGE);
}
I'm trying to develop a painter app using MFC with C++.
So I set up a view in which I do the actual painting. However, when I open the color button I get "leftovers" of the menu on my canvas view.. I have no idea how to erase them.. I tried using SaveDC and RestoreDC to restore it to the previous state but no luck there. As I understand it is meant to restore properties of the device context such as pen & brush but it has no use for me...
I also need this feature so when I put up a rectangle, I could present a preview for it, but the "previews` are again presented like leftovers.
My view's OnEraseBkgbd;
BOOL CanvasView::OnEraseBkgnd(CDC* pDC)
{
if (!isBackgroundInit)
{
CRect rect;
GetClientRect(&rect);
CBrush myBrush(RGB(255, 255, 255)); // dialog background color
CBrush* pOld = pDC->SelectObject(&myBrush);
BOOL bRes = pDC->PatBlt(0, 0, rect.Width(), rect.Height(), PATCOPY);
pDC->SelectObject(pOld); // restore old brush
isBackgroundInit = true;
return bRes;
}
return 0;
}
My OnPaint:
void CanvasView::OnPaint()
{
CDialogEx::OnPaint();
//UpdateData(true);
CRect rect;
GetClientRect(&rect);
if (dc == nullptr)
{
dc = new CClientDC(this);
//dc->CreateCompatibleDC(dc);
HDC hdc = CreateCompatibleDC(*dc);
this->hdc = &hdc;
} else
{
BitBlt(*dc, 0, 0, (int)rect.Width(), (int)rect.Height(), *hdc, 0, 0, SRCCOPY);
}
}
How it looked at first:
How it looks when opening a color button:
How it looks after closing the color button menu(leftovers marked with red arrows):
When trying to put up a rectangle:
Any idea how to fix this and really restore drawing?
I am not sure I understand what you are trying to do.
CView has a virtual method called OnDraw. This is the method you must override:
void CMyView::OnDraw(CDC* pDC)
{
CMyDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
if (!pDoc)
return;
// first erase the entire client rectangle
CRect cr;
GetClientRect( &cr );
pDC->FillSolidRect( cr, RGB( 255, 255, 255 ) );
// your actual drawing goes here
pDC->Rectangle( 0, 0, 100, 100 );
}
You will also have to write OnEraseBkgnd:
BOOL CMyView::OnEraseBkgnd( CDC* /*pDC*/ )
{
return TRUE; // we fill the client rectangle in OnDraw
}
Also, it looks like you are trying to implement an ad-hoc memory DC. There is already one: CMemDC.
I'm trying to place dialog window adjacent to desktop's top or bottom border.
Code:
CRect MonitorWorkingArea(HMONITOR monitor)
{
MONITORINFOEX monInfo;
zeroVar(monInfo);
monInfo.cbSize = sizeof(monInfo);
GetMonitorInfo(monitor, &monInfo);
return monInfo.rcWork;
}
CRect MonitorWorkingArea_Wnd(HWND hwnd)
{
return MonitorWorkingArea(MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST));
}
CRect MonitorWorkArea_Wnd(CWnd& wnd)
{
return MonitorWorkingArea_Wnd(wnd.GetSafeHwnd());
}
void CMyDialog::SetDefaultWndPos(bool toBottom)
{
// Here we can be sure, that
// a) parent of this window is not null, is visible, not minimized
// b) this window smaller than working area of desktop
// c) it has WS_POPUP style
CRect rcThis;
GetWindowRect(&rcThis);
// Shift our rectangle to most upper or most bottom position
const CRect rcDesktop = MonitorWorkingArea_Wnd(*this);
rcThis.MoveToY(toBottom ? rcDesktop.bottom - rcThis.Height() : 0);
// Move window
SetWindowPos(NULL, rcThis.left, rcThis.top, 0, 0,
SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
}
Real code is bit more complex, I omit some checks and features for simplicity.
I have two monitors, both are 1920×1080 and in virtual coordinate space they are laying on:
Primary: (0,0) — (1920,1080)
Secondary: (1920,0) — (3840, 1080)
Code above works fine when window placed on primary monitor, but on secondary one it's works unexpectedly: it centers window based on it's parent.
For instance I'm calling SetDefaultWndPos(false) and rcThis being calculated as {left:2710, top:0, right:3423, bottom:550}. So SetWindowPos is called with zero y:
SetWindowPos(NULL, 2710, 0, 0, 0,
SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
But in handler of WM_WINDOWPOSCHANGING
void CMyDialog::OnWindowPosChanging(WINDOWPOS* lpwndpos)
{
__super::OnWindowPosChanging(lpwndpos);
}
I see in debug x = 2710 (unchanged) and y = 475 (unexpected). Next I check dialog's y-position in Spy utility, it's 475. Dialog window looks like it was centered on it's parent window.
All it looks like an OS errorneously detected requested window position as out-of-desktop and used some default positioning.
Only workarund I found is to decrease desktop working area on 1 pixel from each side:
CRect MonitorWorkingArea(HMONITOR monitor)
{
MONITORINFOEX monInfo;
zeroVar(monInfo);
monInfo.cbSize = sizeof(monInfo);
GetMonitorInfo(monitor, &monInfo);
CRect rc = monInfo.rcWork;
if( !(monInfo.dwFlags & MONITORINFOF_PRIMARY) )
{
++rc.left;
++rc.top;
--rc.right;
--rc.bottom;
}
return rc;
}
It works but looks as strange ugly hack.
Can anybody explain what happens here and help me with good decision?
Can it be OS version dependent? (I use Windows 7 Professional SP1).
First of all, i would customize - among other things - color of text and selection color(text background).
For example, text color should be blue; color of text background should be transparent.
So, I have overriden OnPaint() method;
I call SetTextColor() and SetBkColor() functions, but unfortunately I always get invalid colors, or I get an annoying "infinite loop flash" effect.
Here you can see his complete implementation.
void CustomTree::OnPaint()
{
CPaintDC dc(this);
CDC memDC;
memDC.CreateCompatibleDC(&dc);
CRect rcClip, rcClient;
dc.GetClipBox( &rcClip );
GetClientRect(&rcClient);
CBitmap bitmap;
bitmap.CreateCompatibleBitmap( &dc, rcClient.Width(), rcClient.Height() );
memDC.SelectObject( &bitmap );
CRgn rgn;
rgn.CreateRectRgnIndirect( &rcClip );
memDC.SelectClipRgn(&rgn);
rgn.DeleteObject();
/* WHAT IS the correct usage of SetText/Bk Color? */
// ::SetTextColor(memDC, RGB(0, 0, 255));
// ::SetBkColor(memDC, RGB(0, 0, 255));
// COLORREF col = SetTextColor(RGB(0,0,255));
// COLORREF co2 = memDC.SetTextColor(RGB(0,0,255));
// First let the control do its default drawing.
CWnd::DefWindowProc(WM_PAINT, (WPARAM)memDC.m_hDC, 0);
// do some others stuffs...
dc.BitBlt(rcClip.left, rcClip.top, rcClip.Width(), rcClip.Height(), &memDC,
rcClip.left, rcClip.top, SRCCOPY);
memDC.DeleteDC();
}
Where is the error?
Thanks
IT
If you want to change color and font for a treeview, you have to catch and respond to NM_CUSTOMDRAW. Simply setting the properties before calling the default is insufficient.
I've been working on a DLL hook for a game that allows to modify some in game memory things to greater my knowledge in hooking and modifying memory etc. I've come to a point where i can't quite figure out how to continue!
I've created a font and displayed it to the screen using the below method..
LPD3DXFONT g_pFont = NULL;
HRESULT WINAPI hkEndScene(LPDIRECT3DDEVICE9 pDevice)
{
if(g_pFont == NULL){
D3DXCreateFontA(pDevice, 12, 0, FW_BOLD, 1, 0, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, ANTIALIASED_QUALITY, DEFAULT_PITCH | FF_DONTCARE, "Verdana", &g_pFont);
}
if(g_pFont != NULL)
{
RECT rect = { 10, 10, 500,200 };
g_pFont->DrawTextA(NULL, "Text to draw to screen", -1, &rect, 0,tGreen);
}
return oEndScene(pDevice);
}
Now what i need to figure out is how I can remove that DrawTextA from the screen, or change it's text to something else. I have absolutely no clue how to do this!
Any help is greatly appreciated, thanks all!
Well, it looks like I didn't quite understand how EndScene worked! Looks like it's drawn at the end of every frame and I just need to do an if statement to get it to go away!
if(g_pFont != NULL)
{
//RECT struct - left,top,right,bottom in pixels
if(g_timer < 2000){
RECT rect = { 10, 10, 500,200 };
g_pFont->DrawTextA(NULL, "Draw this and remove this", -1, &rect, 0,tGreen);
}
}
g_timer is set to ++ inside of the hkDrawIndexedPrimitive thread.