How to modify the size of an image via the 'StretchBlt' function?

When I run my codes, The image I want to display is much larger than the picture control – in fact, it takes up the entire dialog.

I wrote this :

#include "stdafx.h"
#include "BaslerCode.h"
#include <pylon/PylonIncludes.h>
#include <iostream>
#include "resource.h"
#include "CImageEventHandler.h" 

void BaslerCode::OnImageGrabbed(CInstantCamera& camera, const CGrabResultPtr& ptrGrabResult)
{
     if (ptrGrabResult->GrabSucceeded())
    {
        CImage img;
        img.Create(imageRGB.GetWidth(), imageRGB.GetHeight(), 8); 

        imageRGB.GetWidth() * imageRGB.GetHeight());
        errno_t memcpy_s(void *dest,size_t destSize,const void *src,size_t count); 

        CWnd* pPictureBox = AfxGetApp()->GetMainWnd();
        CDC* pDC = pPictureBox->GetDC();
        
        **img.StretchBlt(pDC->m_hDC,0,0,rect.Width(),rect.Height(),SRCCOPY);**

        img.Draw(pDC->m_hDC, 0, 0);
        pPictureBox->ReleaseDC(pDC);
    }
}

>Solution :

You are using the wrong HWND. What you need is imageviewer.

CWnd* pPictureBox = AfxGetApp()->GetMainWnd();

and avoid redrawing. comment //img.Draw(pDC->m_hDC, 0, 0);

Also pay attention to length and width rect.Width(),rect.Height()