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Did you use of WM_ERASEBKGND and can you show your code?
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BEGIN_MSG_MAP(CMyButton)
MESSAGE_HANDLER(WM_CREATE,OnCreate)
MESSAGE_HANDLER(WM_PAINT,OnPaint)
MESSAGE_HANDLER(WM_LBUTTONDOWN,OnLButtonDown)
MESSAGE_HANDLER(WM_LBUTTONUP,OnLButtonUp)
MESSAGE_HANDLER(WM_MOUSEMOVE ,OnMouseMove)
MESSAGE_HANDLER(WM_MOUSELEAVE ,OnMouseLeave)
MESSAGE_HANDLER(WM_KILLFOCUS, OnRefresh)
MESSAGE_HANDLER(WM_SETFOCUS, OnRefresh)
MESSAGE_HANDLER(BM_SETCHECK, OnStateChange)
MESSAGE_HANDLER(BM_SETSTATE, OnStateChange)
MESSAGE_HANDLER(WM_ENABLE, OnRefresh)
MESSAGE_HANDLER(WM_UPDATEUISTATE,OnRefresh)
END_MSG_MAP()
I did not use the WM_ERASEBKGND,and the system will do the default?
Need I to disable this msg?such as :
in handle WM_ERASEBKGND msg,return TRUE.
Great & Free windows software for you
http://www.aisnote.com
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Bitmaps don't just change to black by themselves.
You haven't provided anything for us to be able to help you.
How and where are you drawing the bitmap?
What is the format of the bitmap?
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
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Thanks your reply.Let me explain how I used the bitmap in my code.
I used WTL.
I just on WM_PAINT to draw the groupbox background use the bitmap.And I need to make the bitmap transparent.
In common ,the isssue do not duplicated.But sometimes it can be duplicated.
I posted the issue in detail here:
http://aisnote.spaces.live.com/blog/cns!5F43300FF5FC67C!161.entry[^]
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http://www.aisnote.com
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Still no code showing how you render the bitmap... 
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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HBITMAP WINAPI ExtractSubBitmap(HBITMAP hSrcBitmap,CPoint ptStart,CPoint ptEnd)
{
HBITMAP hBitmap = NULL;
CDC srcMemDC,desMemDC;
HDC hDC = ::GetDC(0);
srcMemDC.CreateCompatibleDC(hDC);
desMemDC.CreateCompatibleDC(hDC);
srcMemDC.SelectBitmap(hSrcBitmap);
hBitmap = CreateCompatibleBitmap(hDC,ptEnd.x-ptStart.x,ptEnd.y-ptStart.y);
desMemDC.SelectBitmap(hBitmap);
desMemDC.BitBlt(0,0,ptEnd.x-ptStart.x,ptEnd.y-ptStart.y,srcMemDC,ptStart.x,ptStart.y,SRCCOPY);
ReleaseDC(0,hDC);
return hBitmap;
}
And I used the reurn hBitmap to draw.But sometimes I found the passed "HBITMAP hSrcBitmap" have been changed to black.why?
Great & Free windows software for you
http://www.aisnote.com
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I've never used WTL, but generally you need to select bitmaps back out of a DC
(by restoring its previous bitmap) before using the bitmap.
Is hSrcBitmap a device dependent bitmap or a DIBSection?
Is hSrcBitmap always the same format (bits-per-pixel), and is the format compatible
with the screen?
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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hSrcBitmap is just use LoadBitmap from resource and stored in
a global member so that it can be shared by some windows.
Great & Free windows software for you
http://www.aisnote.com
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e_ilite wrote: hSrcBitmap is just use LoadBitmap from resource
If hSrcBitmap is not a DIBSection:
hSrcBitmap has to be the same format as the screen or the SelectBitmap will fail.
What format is hSrcBitmap? 8bpp? 24bpp?
Mark Salsbery
Microsoft MVP - Visual C++
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The origin bitmap of hSrcBitmap is 24bpp.
Great & Free windows software for you
http://www.aisnote.com
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Can you reproduce the problem consistently and debug it, like error checking
all the GDI cal return values?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Hi all,
I am getting an error C2022: '65279' : too big for character at the line in bold below, What should I change here? This code works if I use wsprintfW and wszBuffer is WCHAR however I need this for multibyte and must use "_T" not "L"
Any advise?
Thanks,
Jayjay
if( pRegInfo->uTaskRegID == 0 )
{
GUID AppGUID, TaskGUID;
::CoCreateGuid(&AppGUID);
::CoCreateGuid(&TaskGUID);
WCHAR wszGUID[50], wszTaskGUID[50];
::StringFromGUID2(AppGUID, wszGUID, 50);
::StringFromGUID2(TaskGUID, wszTaskGUID, 50);
TCHAR wszBuffer[1025] = { 0 };
::wsprintf(wszBuffer,
_T("\xfeff<?xml version=\"1.0\" encoding=\"UTF-16\" ?>\n")
_T("<applications xmlns=\"http://schemas.microsoft.com/windows/cpltasks/v1\" xmlns:sh=\"http://schemas.microsoft.com/windows/tasks/v1\">")
_T("<application id=\"%s\">")
_T("<sh:task id=\"%s\" needsElevation=\"%s\">")
#ifdef _UNICODE
L"<sh:name>@%s,-%ld</sh:name>"
L"<sh:keywords>@%s,-%ld</sh:keywords>"
L"<sh:command>%%systemroot%%\\system32\\control.exe /name %s</sh:command>"
#else
_T("<sh:name>@%hs,-%ld</sh:name>")
_T("<sh:keywords>@%hs,-%ld</sh:keywords>")
_T("<sh:command>%%systemroot%%\\system32\\control.exe /name %hs</sh:command>")
#endif // _UNICODE
_T("</sh:task>")
_T("<category id=\"%ld\">")
_T("<sh:task idref=\"%s\"/>")
_T("</category>")
_T("</application>")
_T("</applications>"),
wszGUID,
wszTaskGUID,
pRegInfo->dwRunLevel == 0 ? _T("false") : _T("true"),
szDllName, Info.uTaskRes,
szDllName, Info.uKeywordsRes,
Info.pstrCanonicalName,
pRegInfo->dwCategory,
wszTaskGUID);
::wsprintf(szGUID, _T("%ws"), wszGUID);
::lstrcpy(szTaskFileUrl, szDllFile);
::wsprintf(_FindLastOf(szTaskFileUrl, '.'), _T("_cpl%d.xml"), pRegInfo->iIndex + 1);
if( bRegister ) {
HANDLE hFile = ::CreateFile(szTaskFileUrl, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if( hFile == INVALID_HANDLE_VALUE ) return HRESULT_FROM_WIN32(::GetLastError());
DWORD dwWritten = 0;
::WriteFile(hFile, wszBuffer, ::lstrlen(wszBuffer) * sizeof(WCHAR), &dwWritten, NULL);
::CloseHandle(hFile);
}
else {
::DeleteFile(szTaskFileUrl);
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I don't see a bold line. Error C2022 in the documentation says, "The octal number following a backslash (\) in a character or string constant is too big to represent a character". So I am guess that you are trying to assign a number greater than 255 for a char variable.
-Saurabh
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Hi Saurabh,
It is this line
_T("\xfeff<?xml version=\"1.0\" encoding=\"UTF-16\" ?>\n")
Thanks,
Jayjay
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The first character is \xfeff which is 65279. This value cannot be stored in a char variable. I think you can split it into two characters for ANSI chars (\xfe\xff) and single char for wide-chars.
-Saurabh
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Saurabh.Garg wrote: The first character is \xfeff which is 65279. This value cannot be stored in a char variable. I think you can split it into two characters for ANSI chars (\xfe\xff) and single char for wide-chars.
But:
Keep in mind how values are stored.On an Intel Machine: \xfeff should be reversed when broken up as: \xff\xfe.
Bram van Kampen
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Hello
I have a strange behavior with a program I've made
I've first made a dialog box with an OpenGL display
Everything was working ok
Then I added a button in my dialog box then transfer my OpenGL calls in it (subclass from CButton)
The OpenGL drawing work ok on the button, but the timer on my calling dialog box freeze when I'm using the OpenGL functions
The timer resume normally when I close the dialog box
- The OpenGL call is the same as it was when it was directly on the dialog box
- When I deactivate the OpenGL calls, my timer work ok
Do anyone have an idea off what is happening?
Thank you
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Hi everybody! I am developing an application in visual c++ (windows form application), and i want to set some of the parameters of my wireless card thru ndis (for instance the infrastuture mode). Can I do that ? how? any idea?
thaks!!!
Gloria.
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how to write a code in VC++ for acquiring an image from the camera through activedcam card
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jjvr wrote: how to write a code in VC++
What's going on? Did someone just outsource this project to you? What are the requirements?
led mike
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!
Bram van Kampen
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Hello again!
Using MFC, I am trying to implement an EDIT BOX and to print the content of it into a file.
I have associated a variable to the EDIT BOX, and that is CString varName.
When writing this variable into a log file, LOG.Write (varName, <not yet sure what length> ); , i get the result:
- for input: Shpid3r => S<square>h<square>p<square>i<square>d<square>3<square>r<square>.
I think that this is because using UNICODE character set, and every character in the CString is using 2 bytes, whilst using it into the Write() method, converts the string byte-by-byte.
Setting to use ANSI, creates an error (not finding a header file)... anyway my application should support unicode character set, even if logging will not meet unicode characters.
How should I do in order to get a proper logging?
Thank you!
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You may:
- Convert your string to an ANSI one before writing it to the log (check out the T2A macro [^]).
or just use (a usually annoying feature of C++ )
- wofstream object to print the string (no need to convert it) to the log file.
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.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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grid consists 10 rows. i want to sort only 5 rows based on the column selected. how to do that.
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