wtl for mfc programmers, part iv.mht

大家知道wtl是window UI库

                  href=3D"http://www.codeproject.com/store/"><B>VS.NET =
2003 from=20
                  $899</B></A></TD></TR>
              <TR vAlign=3Dtop>
                <TD><IMG height=3D16=20
                  =
src=3D"http://www.codeproject.com/script/images/support_icon.gif"=20
                  width=3D16></TD>
                <TD class=3DsmallText><A=20
                  href=3D"http://www.codeproject.com/store/"><B>MSDN =
Univ. from=20
                  $1950</B></A></TD></TR>
              <TR vAlign=3Dtop>
                <TD></TD>
                <TD></TD></TR>
              <TR vAlign=3Dtop>
                <TD><IMG height=3D16=20
                  src=3D"http://www.codeproject.com/images/print.gif" =
width=3D16></TD>
                <TD class=3DsmallText><A=20
                  =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp?print=3Dtrue"=20
                  target=3D_print>Print version</A></TD></TR>
              <TR vAlign=3Dtop>
                <TD><IMG height=3D16=20
                  src=3D"http://www.codeproject.com/images/link.gif" =
width=3D16></TD>
                <TD class=3DsmallText><A=20
                  =
href=3D"http://www.codeproject.com/script/profile/add_bookmark.asp?t=3D0&=
amp;ct=3D%2Fwtl%2Fwtl4mfc4%2Easp&amp;guid=3DWTL4MFC4%2Fwtl4%2F27%2F2003">=
Bookmark=20
                  this</A></TD></TR></TR>
              <TR vAlign=3Dtop>
                <TD><IMG height=3D16=20
                  src=3D"http://www.codeproject.com/images/mail.gif" =
width=3D16></TD>
                <TD class=3DSmallText><A=20
                  =
href=3D"http://www.codeproject.com/script/recommend/form.asp?guid=3DWTL4M=
FC4%2Fwtl4%2F27%2F2003">Send=20
                  to a friend</A></TD></TR>
              <TR vAlign=3Dtop>
                <TD></TD>
                <TD></TD></TR>
              <TR vAlign=3Dtop>
                <TD></TD>
                <TD class=3DInfoBarHeader>My Profile</TD></TR>
              <TR>
                <TD bgColor=3Dblack colSpan=3D2><IMG height=3D1=20
                  src=3D"http://www.codeproject.com/images/space.gif"=20
              width=3D1></TD></TR>
              <TR vAlign=3Dtop>
                <TD><IMG height=3D16=20
                  =
src=3D"http://www.codeproject.com/images/profile_small.gif"=20
                  width=3D16></TD>
                <TD class=3DsmallText><A=20
                  =
href=3D"http://www.codeproject.com/script/profile/modify.asp?ct=3D/wtl/wt=
l4mfc4.asp">My=20
                  Settings</A></TD></TR>
              <TR vAlign=3Dtop>
                <TD><IMG height=3D16=20
                  =
src=3D"http://www.codeproject.com/images/submit_small.gif"=20
                  width=3D16></TD>
                <TD class=3DsmallText><A=20
                  =
href=3D"http://www.codeproject.com/script/articles/list_articles.asp?user=
id=3D273403">My=20
                  Articles</A></TD></TR>
              <TR vAlign=3Dtop>
                <TD><IMG height=3D16=20
                  =
src=3D"http://www.codeproject.com/images/bookmarks.gif"=20
                width=3D16></TD>
                <TD class=3DsmallText><A=20
                  =
href=3D"http://www.codeproject.com/script/profile/bookmark_list.asp">My=20
                  Bookmarks</A></TD></TR>
              <TR vAlign=3Dtop>
                <TD><IMG height=3D16=20
                  =
src=3D"http://www.codeproject.com/images/logoff_small.gif"=20
                  width=3D16></TD>
                <TD class=3DsmallText><A=20
                  =
href=3D"http://www.codeproject.com/script/profile/logoff.asp?ct=3D/wtl/wt=
l4mfc4.asp">Sign=20
                  out</A></TD></TR>
              <TR>
                <TD bgColor=3Dblack colSpan=3D2><IMG height=3D1=20
                  src=3D"http://www.codeproject.com/images/space.gif"=20
              width=3D1></TD></TR></TBODY></TABLE></TD></TR>
        <TR>
          <TD>&nbsp;</TD></TR>
        <TR>
          <TD>
            <CENTER><A=20
            =
href=3D"http://www.codeproject.com/script/admentor/admentorredir.asp?id=3D=
171&amp;way=3Dban"=20
            target=3D_blank><IMG height=3D600=20
            alt=3D"MSDN Magazine - Your guide to Microsoft tools, =
development environments, and technologies for Windows and the Web."=20
            =
src=3D"http://www.codeproject.com/script/admentor/images/mm120_600_codepr=
ot3.gif"=20
            width=3D120 =
border=3D0></A><BR></CENTER><BR></TD></TR></TBODY></TABLE></TD>
    <TD width=3D5 rowSpan=3D2><IMG height=3D1=20
      src=3D"http://www.codeproject.com/images/space.gif" width=3D5> =
</TD>
    <TD align=3Dright width=3D"100%" bgColor=3Dwhite>
      <TABLE width=3D"100%">
        <TBODY>
        <TR>
          <TD class=3DsmallText vAlign=3Dtop noWrap></TD>
          <TD noWrap align=3Dright><A name=3D__top></A>
            <TABLE>
              <TBODY>
              <TR>
                <TD class=3DsmallText align=3Dright>46 members have =
rated this=20
                  article. Result:</TD>
                <TD>
                  <TABLE cellSpacing=3D0 cellPadding=3D0 border=3D2>
                    <TBODY>
                    <TR>
                      <TD><IMG height=3D5=20
                        =
src=3D"http://www.codeproject.com/script/images/red.gif"=20
                        width=3D20 border=3D0></TD>
                      <TD><IMG height=3D5=20
                        =
src=3D"http://www.codeproject.com/script/images/red.gif"=20
                        width=3D20 border=3D0></TD>
                      <TD><IMG height=3D5=20
                        =
src=3D"http://www.codeproject.com/script/images/red.gif"=20
                        width=3D20 border=3D0></TD>
                      <TD><IMG height=3D5=20
                        =
src=3D"http://www.codeproject.com/script/images/red.gif"=20
                        width=3D20 border=3D0></TD>
                      <TD><IMG height=3D5=20
                        =
src=3D"http://www.codeproject.com/script/images/red.gif"=20
                        width=3D18 border=3D0><IMG height=3D5=20
                        =
src=3D"http://www.codeproject.com/script/images/white.gif"=20
                        width=3D2 =
border=3D0></TD></TR></TBODY></TABLE></TD></TR>
              <TR>
                <TD class=3DsmallText align=3Dright colSpan=3D2><A=20
                  title=3D"Calculated as rating x Log10(# votes)"=20
                  =
href=3D"http://www.codeproject.com/script/articles/top_articles.asp?st=3D=
2">Popularity:=20
                  8.13</A>. Rating: <B>4.89</B> out of=20
        5.</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR>
  <TR>
    <TD vAlign=3Dtop width=3D"100%">
      <DIV id=3Dcontentdiv><!-- Article Starts -->
      <UL class=3Ddownload>
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/WTL4MFC4/WTL4MFC4_demo.zip">Downlo=
ad=20
        demo project - 48 KB</A> </LI></UL><!-- Add the rest of your =
HTML here -->
      <H2>Contents</H2>
      <UL>
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#intro">Introduction</=
A>=20

        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#refresher">Refresher =

        on ATL Dialogs</A>=20
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#ccwrappers">Common=20
        Control Wrappers</A>=20
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#appwizard">Creating =
a=20
        Dialog-Based App with the AppWizard</A>=20
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#usingwrap">Using the =

        Control Wrapper Classes</A>=20
        <UL>
          <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#atl1">ATL Way=20
          1 - Attaching a CWindow</A>=20
          <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#atl2">ATL Way=20
          2 - CContainedWindow</A>=20
          <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#atl3">ATL Way=20
          3 - Subclassing</A>=20
          <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#wtlway">The=20
          WTL Way - DDX</A> </LI></UL>
        <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#moreddx">More=20
        on DDX</A>=20
        <UL>
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#ddxmacros">DDX=20
          macros</A>=20
          <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#moreddx">More=20
          about DoDataExchange()</A>=20
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#usingddx">Using=20
          DDX</A> </LI></UL>
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#handlenotify">Handlin=
g=20
        Notifications from Controls</A>=20
        <UL>
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#handleinparent">Handi=
ng=20
          notifications in the parent</A>=20
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#reflnotify">Reflectin=
g=20
          Notifications</A>=20
          <UL>
            <LI><A=20
            =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#wtlreflmacros">WTL=20
            macros for handling reflected messages</A> =
</LI></UL></LI></UL>
        <LI><A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#oddsends">Odds=20
        &amp; Ends</A>=20
        <UL>
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#dlgfonts">Dialog=20
          Fonts</A>=20
          <LI><A=20
          =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#atlmincrt">_ATL_MIN_C=
RT</A>=20
          </LI></UL>
        <LI><A=20
        =
href=3D"http://www.codeproject.com/wtl/wtl4mfc4.asp#revisionhistory">Revi=
sion=20
        History</A> </LI></UL>
      <H2><A name=3Dintro></A>Introduction to Part IV</H2>
      <P>Dialogs and controls are one area where MFC really saves you =
time and=20
      effort. Without MFC's control classes, you'd be stuck filling in =
structs=20
      and writing tons of <CODE>SendMessage</CODE> calls to manage =
controls. MFC=20
      also provides dialog data exchange (DDX), which transfers data =
between=20
      controls and variables. WTL supports all those features as well, =
and adds=20
      some more improvements in its common control wrappers. In this =
article=20
      we'll look at a dialog-based app that demonstrates the MFC =
features that=20
      you're used to, as well as some more WTL message-handling =
enhancements.=20
      Advanced UI features and new controls in WTL will be covered in =
Part=20
V.</P>
      <H2><A name=3Drefresher></A>Refresher on ATL Dialogs</H2>
      <P>Recall from <A =
href=3D"http://www.codeproject.com/wtl/wtl4mfc1.asp">Part=20
      I</A> that ATL has two dialog classes, <CODE>CDialogImpl</CODE> =
and=20
      <CODE>CAxDialogImpl</CODE>. <CODE>CAxDialogImpl</CODE> is used for =
dialogs=20
      that host ActiveX controls. We won't cover ActiveX controls in =
this=20
      article, so the sample code uses <CODE>CDialogImpl</CODE>.</P>
      <P>To create a new dialog class, you do three things:</P>
      <OL>
        <LI>Create the dialog resource=20
        <LI>Write a new class derived from <CODE>CDialogImpl</CODE>=20
        <LI>Create a public member variable called <CODE>IDD</CODE>, and =
set it=20
        to the dialog's resource ID. </LI></OL>
      <P>Then you can add message handlers just like in a frame window. =
WTL=20
      doesn't change that process, but it does add other features that =
you can=20
      use in dialogs.</P>
      <H2><A name=3Dccwrappers></A>Control Wrapper Classes</H2>
      <P>WTL has lots of control wrappers which should be familiar to =
you=20
      because the WTL classes are usually named the same (or almost the =
same) as=20
      their MFC counterparts. The methods are usually named the same as =
well, so=20