Use a sprite C++ MFC - c++

Question

I need to display an image from a sprite using MFC. A search on google led me to this link which led me to this code :
//This code is in the OnPaint function
//img is a CImage, declared as a class member
img.Load(_T("icon-sprite.png"));
HDC imgDc = img.GetDC();
int height = 24;
int width = 24;
//Sprite Icon is a CStatic
CDC* spriteDc = spriteIcon.GetDC();
HDC spriteHdc = spriteDc->GetSafeHdc();
CClientDC pDC(this);
HDC hdcWindow = pDC->GetSafeHdc();
//img.StretchBlt(imgDc, 0, 0, 600, 203, SRCCOPY);
//img.BitBlt(imgDc, width, height, 600, 203, 0, 0, SRCAND);
//img.BitBlt(imgDc, width, height, 640, 480, 0, 0, SRCPAINT);
StretchBlt(imgDc, 0, 0, 600, 203,
imgDc, 0, 0, 200, 203, SRCCOPY);
BitBlt(imgDc, width, height, 600, 203,
imgDc, 0, 0, SRCAND);
BitBlt(imgDc, width, height, 640, 480,
imgDc, 0, 0, SRCPAINT);
spriteIcon.SetBitmap((HBITMAP)img);
With this code spriteIcon only display a rectangle of the size of the sprite image.
What did I do wrong ?

Answer 1

Most probably CImage is local and going out of scope, thus the image (and HBITMAP) is invalid. You have two options:
Declare CImage such that it would exist even after this function returns.
Use CImage::Detach which returns a HBITMAP and relinquishes its ownership with handle (i.e. won't delete on destructor).
Please ensure that given image exists and is loaded properly.
Also, you don't need to new CClientDC, you can have it on stack.