Click a button and change color on rectangle?

I have a problem. I need to change color to the rectangle when I click a button on the toolbar.
Here is the code for OnDraw:

Code:

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void CObligatorisk_oppgaveView::OnDraw(CDC* pDC){

        CObligatorisk_oppgaveDoc* pDoc = GetDocument();
        ASSERT_VALID(pDoc);
        if (!pDoc)
                return;

        // Tegner ut rektangel A og rektangel B og resultatet C
        pDC->FrameRect(rectA, &blackBrush);
        pDC->FrameRect(rectB, &blackBrush);

        if(fargered=true)
        {
                pDC->FrameRect(rectC, &redBrush);
        }
        else
        {
                CBrush blackHatchBrush;
                blackHatchBrush.CreateHatchBrush(HS_FDIAGONAL, RGB(0,0,0));
                CBrush* pOldBrush = pDC->SelectObject(&blackHatchBrush);

                CPen blackPen;
                blackPen.CreatePen(PS_SOLID, 3, RGB(0, 0, 0));
                CPen* pOldPen = pDC->SelectObject(&blackPen);

                pDC->Rectangle(rectC);

                pDC->SelectObject(pOldPen);
                pDC->SelectObject(pOldBrush);

        }

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Here is the code for the button:

Code:

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void CObligatorisk_oppgaveView::OnFargerR()
{
        fargered = true;
        Invalidate();

}

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Can some one help me? :wave:

Quote:

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if(fargered=true)

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Perhaps this should be

Quote:

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if(fargered==true)

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Quote:

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I have a problem. I need to change color to the rectangle when I click a button on the toolbar.
Here is the code for OnDraw:

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So what is the problem? :confused: Should we guess?

Quote:

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Code:

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if(fargered=true)

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Perhaps this should be

Code:

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if(fargered==true)

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You should not use any of the two forms, but:

Code:

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if(fargered)

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and if you want to test it agains false then

Code:

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if(!fargered)

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PS: doesn't you compiler give you a warning here

Code:

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if(fargered=true)

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It should.

No warning from the compiler, strange since you said that.

I'll check...

The compiler generates a warning on an assignment within conditional expression on Warning Level 4, looks like you didn't change the default level 3.