Why is it that the value returned by getextentpoint32 remain the same regardless of the current font size?

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C++

I am developing this application and in order to ensure content is adjusted to page size, a the application uses the current font size and the value that GetTextExtentPoint32 returned to adjust the page size by feeding the out come into a while loop. I was rather schocked to discover that GetExtentPoint32 keep returning the same value inspite of decrrase of font-size. Why is that so, how can I solve this challenge.

The relevant codes are shown below:

GetTextExtentPoint32(hdc, wstSchoolName11.c_str(), lstrlen(wstSchoolName11.c_str()), &size);
if ((iTextLeft + size.cx) > (iPaperWidth - iPictureWidth - iOffsetX))
	{
		iFontSize--;

		hNewFont = CreateAppFont(iFontSize, FW_BOLD);
		hOldFont = (HFONT)SelectObject(hdc, hNewFont);
		GetTextMetrics(hdc, &tm);
		//int iTextTop11 = iTop + iOffsetY;
		//int iTextLeft11 = iImageLeft + iPictureWidth + 5 * dOneMMX;
		wstring wstSchoolName11 = utf8_decode(stSchoolName);
		CharUpper(&wstSchoolName11[0]);
		//SIZE size11;
		GetTextExtentPoint32(hdc, wstSchoolName11.c_str(), lstrlen(wstSchoolName11.c_str()), &size);
	}
	else
	{
		bMaximumWith = true;
	}

int iWindowExtX = 1000 * GetDeviceCaps(hDC,HORZSIZE);
    int iWindowExtY = 1000 * GetDeviceCaps(hDC, VERTSIZE);

    int iViewPortX = GetDeviceCaps(hDC, HORZRES);
    int iViewPortY = GetDeviceCaps(hDC, VERTRES);

    SetMapMode(hDC, MM_ISOTROPIC);
    SetWindowExtEx(hDC, iWindowExtX, iWindowExtY, nullptr);
    SetViewportExtEx(hDC, iViewPortX, iViewPortY, nullptr);

The definition of CreateFont app is as shown below. Is there anything wrong with it?

HFONT CreateAppFont(int cHeight, int cWeight, DWORD bItalic = 0, int cEscapement = 0, DWORD bUnderline = 0, LPCWSTR pszFaceName = L"Times New Roman");


HFONT CreateAppFont(int cHeight, int cWeight, DWORD bItalic, int cEscapement, DWORD bUnderline, LPCWSTR pszFaceName)
{
	return CreateFont(cHeight, 0, cEscapement, cEscapement, cWeight, bItalic, bUnderline, FALSE, DEFAULT_CHARSET, OUT_OUTLINE_PRECIS,
		CLIP_DEFAULT_PRECIS, CLEARTYPE_QUALITY, VARIABLE_PITCH, pszFaceName);

	
}

What I have tried:

I have done have spent reasonable time debugging. The outcome neccitated this post.