GDI USAGE ERROR: DC 0x2d0110d1 that contains selected object being deleted

uint32_t WIN_FONT::GetTextWidth(const char* theText, uint32_t theLength)
// Return the number of pixels width the text is base on the font info.
{
 uint32_t width = 0;

 wchar_t* wcString = NULL;
 int32_t wcLength = CreateWideString(theText, theLength, &wcString);
 if (wcLength > 0)
 {
  HDC hdc = GetDC(NULL);
  (HFONT)SelectObject(hdc, (HGDIOBJ)winFont);

  SIZE size;
  if(GetTextExtentPoint32W(hdc, wcString, wcLength, &size))
  {
   width = size.cx;
  }
  ReleaseDC(NULL, hdc); // <= Error detected here
  delete[] wcString;
 }

 return width;
}