Don't know how to use byte* of a image?

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I read this toturial:http://www.runicsoft.com/bmp.cpp[^]. But i don't know how to use it.
I want everytime Left mouse down on my control, it will return int format: "RGB(R,G,B)".
But when i use it in container C#,it worked incorrectly.

My code:

C++

void CLoadImageXCtrl::OnLButtonDown(UINT nFlags, CPoint point)
{
	int x, y;
	long size;
	BYTE* Buffer = LoadBMP ( &x, &y, &size, "myBMP.bmp" );
	BYTE* aRGB =ConvertBMPToRGBBuffer(Buffer,x,y);
	delete[] Buffer;
	int index=point.x*x+point.y;		
	CString str;
	COLORREF clr= RGB(aRGB[index],aRGB[index+1],aRGB[index+2]);
	str.Format("!!!RGB(%d,%d,%d)",GetRValue(clr),GetGValue(clr),GetBValue(clr));
	delete[] aRGB;
	myClick(str);
	InvalidateControl();	
	COleControl::OnLButtonDown(nFlags, point);
}

Please sone help me.
I am newbie.
Thanks in advance.

Posted 4-Oct-15 21:47pm

Tokia

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Comments

Richard MacCutchan 5-Oct-15 4:17am

You probably need to talk to the person who wrote the tutorial. The functions LoadBMP and ConvertBMPToRGBBuffer are not part of the standard Windows run-time, so it's anyone's guess what they do.

Tokia 5-Oct-15 4:38am

could i ask you? when iload image into a temporary DC but when i use getPIXEL() it not work correctly. Instead of y=10 will get the value i want but the temp c gave y=15, i don't know why? i tried setmapmode but still can't get it. Please!!!

Richard MacCutchan 5-Oct-15 4:49am

Sorry, I know nothing about the code or tutorial that you are using. You really need to contact the author.

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Tokia · Answer 1 · 2015-10-04T22:56:00

Sorry for asking here. But i have no time now.

C++

CString myfuntion(HWND hWnd,CDC* dc,CPoint point)
{	
	CString str;
	CBitmap bmpCOM;
	BITMAP bm;
	
	bmpCOM.LoadBitmap(IDB_ROKU);
	bmpCOM.GetBitmap(&bm);
	CDC dcMem;
	dcMem.CreateCompatibleDC(dc);
	dcMem.SelectObject(bmpCOM);
	HDC hdcMem=dcMem;
	COLORREF clr= GetPixel(hdcMem,point.x,point.y);
	str.Format("W:%d H:%d {X:%d Y=%d}RGB(%d,%d,%d)",bm.bmWidth,bm.bmHeight,point.x,point.y,GetRValue(clr),GetGValue(clr),GetBValue(clr));
	return str;
}

this is the code i wrote by my mind.
But when i used it, the Y axis is not right.
Instead of y=10, it became y=15 in temp DC.
I tried to solve 3 days but have no way.
PLEASE I BEG everyone.
this is where my life is end.

Don't know how to use byte* of a image?

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Don't know how to use byte* of a image?

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