Finding Display Size of Dialog From Resource

This article explains how to find display size of the dialog from it's resource handle. It will be helpful, if you need to arrange position and size of other windows based upon the dialog size before the dialog gets displayed.

There is no MFC support to find the display size of dialog from it's resource and it becomes even more painful to implement if dialog resides in a DLL and contains some ActiveX controls.

Here is the function to find it :


CRect CalcDialogSize(INT nResourceId, 
                     const char* strDllName=NULL)
{
 CRect rectSize;

 // if the dialog resource resides in a DLL ...
 //	
 HINSTANCE hExeResourceHandle;
 HINSTANCE hModule;

 if(strDllName != NULL)
 {
  hExeResourceHandle = AfxGetResourceHandle();

  hModule= ::LoadLibrary(strDllName);
  ASSERT(hModule);

  AfxSetResourceHandle(hModule);
 }

 HINSTANCE hInst = 
  AfxFindResourceHandle(MAKEINTRESOURCE(nResourceId),
                        RT_DIALOG);

 ASSERT(hInst != NULL);

 HRSRC hRsrc = ::FindResource(hInst, 
                              MAKEINTRESOURCE(nResourceId),
                              RT_DIALOG);
 ASSERT(hRsrc != NULL);

 HGLOBAL hTemplate = ::LoadResource(hInst, hRsrc);
 ASSERT(hTemplate != NULL);

 DLGTEMPLATE* pTemplate = (DLGTEMPLATE*)::LockResource(hTemplate);

 //Load coresponding DLGINIT resource 
 //(if we have any ActiveX components)
 //
 void* lpDlgInit;
 HGLOBAL hDlgInit = NULL;
 CDialog dlg;

 HRSRC hsDlgInit = ::FindResource(hInst, 
                                  MAKEINTRESOURCE(nResourceId),
                                  RT_DLGINIT);
 if (hsDlgInit != NULL)
 {
  // load it
  hDlgInit = ::LoadResource(hInst, hsDlgInit);
  ASSERT(hDlgInit != NULL);

  // lock it
  lpDlgInit = ::LockResource(hDlgInit);
  ASSERT(lpDlgInit != NULL);

  dlg.CreateIndirect(pTemplate, NULL, lpDlgInit);   
 }
 else
 {
  dlg.CreateIndirect(pTemplate, NULL);  
 }
		
 CRect rect;
 dlg.GetClientRect(rectSize);

 dlg.DestroyWindow();

 ::UnlockResource(hTemplate);
 ::FreeResource(hTemplate);
 if (hDlgInit) 
 {
  ::UnlockResource(hDlgInit);   
  ::FreeResource(hDlgInit);
 }	

 if(strDllName != NULL)
 {
  AfxSetResourceHandle(hExeResourceHandle);
  ::FreeLibrary(hModule);
 }

 return rectSize;
}



Comments

  • Little shorter and better method

    Posted by Legacy on 11/17/2002 12:00am

    Originally posted by: Sukhanandan

    void CMyAppApp::CalcDialogSize(UINT nResourceId, SIZE& size)
    {
    HRSRC hRsrc = ::FindResource(m_hInstance, MAKEINTRESOURCE(nResourceId), RT_DIALOG);
    ASSERT(hRsrc != NULL);
    HGLOBAL hTemplate = ::LoadResource(m_hInstance, hRsrc);
    ASSERT(hTemplate != NULL);

    DLGTEMPLATE* pTemplate = (DLGTEMPLATE*)::LockResource(hTemplate);
    CDialogTemplate dlgtemplate(pTemplate);
    dlgtemplate.GetSizeInPixels(&size);
    ::UnlockResource(hTemplate);

    return bResult;
    }

    Reply
  • Nice job but I have a slight problem.

    Posted by Legacy on 10/16/2001 12:00am

    Originally posted by: bphillips

    I'm trying to size a CChildframe, in PreCreateWindow, based on the dialog size. It works fine except for the width and height are slightly off. Any suggestions?
    Thanks

    Reply
  • Very well done

    Posted by Legacy on 08/10/2001 12:00am

    Originally posted by: Hamid Yaseen

    Dear
    You have done very well.

    Thanks

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • When individual departments procure cloud service for their own use, they usually don't consider the hazardous organization-wide implications. Read this paper to learn best practices for setting up an internal, IT-based cloud brokerage function that service the entire organization. Find out how this approach enables you to retain top-down visibility and control of network security and manage the impact of cloud traffic on your WAN.

  • U.S. companies are desperately trying to recruit and hire skilled software engineers and developers, but there is simply not enough quality talent to go around. Tiempo Development is a nearshore software development company. Our headquarters are in AZ, but we are a pioneer and leader in outsourcing to Mexico, based on our three software development centers there. We have a proven process and we are experts at providing our customers with powerful solutions. We transform ideas into reality.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date