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You need to register for device change notification events specifying the USB UID. And on start up you need to enumerate the device already there.
It is a two stage registration process, by type then by handle, that way you get the device removal notification event and you can release any handles you have open on the device (else you screw the system up).
Dont have any links but the SDK should provide all the funcs you need if you search for 'device change notification'.
--edit--
Actualy google threw this up straight away: http://msdn.microsoft.com/en-us/library/windows/desktop/aa363432(v=vs.85).aspx
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Nothing to say.
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Dear Friends,
I am working for MFC application. But I dont know about MFC architecture, classes, why CWinApp, CDocument, Cview and where execution starts and execution flow etc... Iam keen to learn all those things. So kindly anyone help me.
Thanks and Regards,
S.Shanmuga Raja
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Hi There ,
MFC architecture is too big to be discussed on a forum .
I would suggest you go through the book of Jeff Prosise, to understand it better .
Sujay Ghosh
Blog : http://sujay-ghosh.blogspot.com
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For an insider understanding of MFC, you can have a look at the MFC Internals[^] books.
Nihil obstat
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MFC Internals would be too much for him. Right now , he is trying to understand the MFC architecture .
Blog : http://sujay-ghosh.blogspot.com
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If I remember correctly, that book, while being more "advanced", was a good reading and help understanding the mess that was MFC; it is a little better now.
Nihil obstat
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Hey guys!
Does any of you have an idea how GDI+ -when filling a rectangle or a region with a color that has an alpha component set- decides to use dithering instead of "real" blending? We are using a third-party library to generate PDF files. When using a printer DC as a "reference" to generate the PDF document, GDI+ seems to use "normal" color blending when filling an area with a translucent color, but when using a screen DC to do the same it "magically" decides to use dithering which produces a "less satisfying" result.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<
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In many cases, the device driver determines how the GDI+ functions operate.
The printer driver for your printer may not support alpha blending.
You might try using a memory DC to build up your graphics, then blitting that to your printer DC.
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It's the other way around actually (read my original post again), when using the printer, i get alpha, when using a screen based DC, i get dithering, this is why i don't understand it, since i KNOW that i can use e.g. AlphaBlend[^] on the screen without any problems, or if i use GetDeviceCaps[^] on the screen DC i see that it supports blending.
I kinda know that the capabilities of the device is -at least usually- determined by the driver "under" it, what i would like to know is what GDI+ does to come to the conclusion that the screen-based device is incapable of blending and thus resorts to "low quality" dithering.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<
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If you're getting dithering, then your bits per pixel may be set to less than 24 bits.
Like I said, the device drivers do most of that work. GDI+ doesn't really make any decisions.
I've never seen reliable results in alpha blending from GDI+. I avoid it and either write my own code to do it, or use OpenGL.
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hi all,
i want to get window color that is appear on window border,start menu and taskbar.
how can i do this?
thanks in advance.
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yes i already use this .
i am using windows 7, and set Leaf color here "Control Panel\Appearance and Personalization\Personalization\Window Color and Appearance"
but using GetSysColor this color cant get even i chk this for all values.
please help me which value is use to get this color?
thanks.
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HTHEME hTheme = ::OpenThemeData(NULL, VSCLASS_TASKBAND);
ATLASSERT(hTheme);
COLORREF clrText = 0;
if(hTheme)
{
const HRESULT hr = ::GetThemeColor(hTheme, TDP_GROUPCOUNT, 0,
TMT_BORDERCOLOR, &clrText);
ATLASSERT(SUCCEEDED(hr));
::CloseThemeData(hTheme);
}
::FillRect(pDC->m_hDC, &banner_rect, ::GetSysColorBrush(CTLCOLOR_DLG));
::DrawThemeParentBackground(obj_RecProfDlg->GetSafeHwnd(), pDC->m_hDC, &banner_rect);
but its not useful
so please help me ,what values i can use GetThemeColor
thanks.
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hi all,
i want t draw banner and button for the dialog box according to current system theme.
please help me how can i do this.
thanks in advance.
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For button, you can use CBitmapButton[^], and for the banner, you can use CStatic[^], where you can put there a bitmap, like banner ... of course, you can find here a derived CButton controls ...
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i dont want to use image for this.
i want to get current system theme and its color than according to this draw the graphics.
what can i do for this?
thanks.
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Well, then you only must setup a style for your application (setup manifest file) and you'll have a current system style on your button and CStatic. If I well understand ...
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yes
how can use setup style?
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Very simple: add manifest file in your project resource folder, and then open Resource.h:
#if _MSC_VER <= 1200
#ifndef IDR_MANIFEST
#define IDR_MANIFEST 1
#endif
#ifndef RT_MANIFEST
#define RT_MANIFEST 24
#endif
#endif // _MSC_VER <= 1200
if you don't have a manifest file, I could send you through email ...
Check here[^] too.
modified 16-Jan-13 4:24am.
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Take a look at this section on MSDN[^].
One of these days I'm going to think of a really clever signature.
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i have written a code in C++ for employees using OOP .. and after building it ,this error message appear : "
1>MSVCRTD.lib(crtexew.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup "
can anybody tell me what does that mean ? & and what should i do to run the program ?
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