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POhow to obtain alphablending in wince 6.0? and how to erase background image in wince 6.0?
 

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  1. POhow to obtain alphablending in wince 6.0? and how to erase background image in wince 6.0?
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    <p>How to obtain a alphablend image in wince 6.0 for a particular child window for n number of times? for example if i have a vol bar graph window which is for volume increase &amp; decrease which is changed on click of vol+ or Vol- button so if i want to keep vol bar graph window as an alphablend image in wince 6.0 then how shall i obtain? Because i have tried in win32 application and i was able to do but i was not able to perform the same in wince 6.0 ?</p> <h2>I have used the below function for painting image for volBarGraph in wince 6.0</h2> <p><strong>void AdjustAlphablendImage(int imgId, char axis_id)</strong></p> <p>{</p> <pre><code>LogEntry(L"Entered in AdjustAlphablendImage Function"); BLENDFUNCTION bf; bf.BlendOp=AC_SRC_OVER; bf.BlendFlags=0; bf.SourceConstantAlpha=55; bf.AlphaFormat=0; HBITMAP bmp = LoadBitmap(handles.hInstance, MAKEINTRESOURCE(imgId)); HDC wdc = GetWindowDC(handles.parent); HDC tdc = CreateCompatibleDC(wdc); SelectObject(tdc,bmp); AlphaBlend(wdc , imgs[axis_id].x, imgs[axis_id].y, imgs[axis_id].width , imgs[axis_id].height, tdc ,0 ,0 , imgs[axis_id].widthSrc, imgs[axis_id].heightSrc, bf); DeleteDC(wdc); DeleteDC(tdc); DeleteObject(bmp); ReleaseDC(handles.parent,wdc); LogEntry(L"Exited from AdjustAlphablendImage Function"); </code></pre> <p>}</p> <p>here 'handles' is an object of type 'HANDLES' and 'parent' is a data member of 'HANDLES' of type 'HWND'.</p> <h2>My structure 'HANDLES' is mentioned below</h2> <p><strong>struct HANDLES</strong></p> <p>{</p> <pre><code> HINSTANCE hInstance; HWND parent; HWND volUp; HWND volDown; HWND volOnOff; HWND chUp; HWND chDown; HWND tvOnOff; HWND tvTitle; HWND volBarGraph; // I am doing alphablending on this................... HWND chNo; HWND chNoBcg; HWND audioStatus; HWND subTitleStatus; HWND message; HWND prevHandle; WNDPROC oldButtonWndProc; HWND pressedButton; int prevButtonId; char prevButtonAxis; char screenMode; </code></pre> <p>};</p> <h2>//The below function is used for calling AdjustAlphablendImage function for volBarGraph.</h2> <p>AdjustAlphablendImage( </p> <pre><code> volumeStatus.volume + volumeStatus.status + INITIAL_VOLUME, // This is used for taking proper image on particular click of vol+ or vol- Button. AXIS_VOL_BAR_GRAPH ); </code></pre> <p><strong>Also how to erase background image in wince 6.0?</strong></p> <p>Please Reply </p> <p>Thanks</p>
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