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<TITLE>SHDOCVW.DLL a fun surprise .. from Microsoft</TITLE>
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<FONT COLOR="#AOAO99">SHDOCVW.DLL The pleasent Surprise Gift from Microsoft</FONT></H3></CENTER>
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This code was contributed by <A HREF="mailto:Girish_Bharadwaj@Pictel.com">Girish Bharadwaj</A>.
<P>If you are someone who likes surprises, I am your friend. I got a pleasent
surprise when I was looking thru the Microsoft Internet control (WebBrowser)
as most people know it.. I opened the shdocvw.dll which comes along with
the <U>Internet explorer 4.0 </U>and surprise, surprise, I found that It
contains Interfaces for the Shell, Shell Link and other stuff which
the shell normally handles and which are painful to implement in C or C++..
See the implementation for the CDirDialog for a sample. This is not present
in IE 3.x ..
<P>Now, In order to use these Interfaces, You need to some work.:-( well,
But this is mucho simpler than the ones we have seen till now.
<P>What I am showing below is just a tip of an Iceberg, You have got a
lot of stuff there. Check out the .H and .CPP files generated and the .ODL
file which I am pasting here. You can do a lot of stuff with this..
<P>Pay close attention to the description strings along with the funtions
. They usually provide a neat pointer as to what the function is supposed
to do..
<P>You can generate the .ODL file by Opening the shdocvw.dll (you
can find it in windows\system directory) in the OLEVIEW.EXE which comes
along with VC++ 5.0. I think its also downloadable from <A HREF="http://www.microsoft.com">Microsoft</A>
site.
<P>After generating the .ODL file, Create a new MFC project in VC++
to your taste. .. Then, Add class from .tlb and select shdocvw.dll.. Select
all the interfaces listed in the list box shown and ask it to create the
wrapper class.
<P>It will be created as shdocvw.h and shdocvw.cpp. These are also there
in the ZIP file attached..
<P>Since, these interfaces are undocumented, I must caution you about
the fact that this might change.. But, then It might not..
<P>Anyway, Add the following lines to your .CPP file where you want to
call the interface functions..
<P><TT><FONT COLOR="#CC0000">#include "initguid.h"</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">//13709620-C279-11CE-A49E-444553540000</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">DEFINE_GUID(CLSID_Shell,0x13709620,0xc279,0x11ce,0xa4,0x9e,0x44,0x45,0x53,0x54,0x00,0x00);</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">//9BA05971-F6A8-11CF-A442-00A0C90A8F39</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">DEFINE_GUID(CLSID_ShellFolderViewOC ,0x9BA05971,0xF6A8,0x11CF,0xa4,0x43,0x00,0xa0,0xc9,0x0a,0x8f,0x39);</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">//9BA05972-F6A8-11CF-A442-00A0C90A8F39</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">DEFINE_GUID(CLSID_ShellWindows,0x9BA05972,0xF6A8,0x11CF,0xa4,0x43,0x00,0xa0,0xc9,0x0a,0x8f,0x39);</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">//11219420-1768-11D1-95BE-00609797EA4F</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">DEFINE_GUID(CLSID_ShellLinkObject,0x11219420,0x1768,0x11D1,0x95,0xbe,0x00,0x60,0x97,0x97,0xea,0x4f);</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">//62112AA1-EBE4-11CF-A5FB-0020AFE7292D</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">DEFINE_GUID(CLSID_ShellFolderView,0x62112AA1,0xEBE4,0x11CF,0xA5,0xfb,0x00,0x20,0xaf,0xe7,0x29,0x2d);</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">//64AB4BB7-111E-11D1-8F79-00C04FC2FBE1</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">DEFINE_GUID(CLSID_ShellUIHelper,0x64AB4BB7,0x111E,0x11D1,0x8f,0x79,0x00,0xc0,0x4f,0xc2,0xfb,0xe1);</FONT></TT>
<P>Of course, before calling any functions, Make sure that the SHDOCVW.DLL
is of the correct version..4.71.1712.5.
<P>You can use the <A HREF="http://www.codeguru.com/dll/dll_version.shtml">technique
Eran Yariv has pointed out</A>. You might want to do that in the beginning
of your program so that you dont have to do that again until the execution
is over.
<P>Now, after this,, Its left to you to do what you want to do..
<P>Following is a trivial example of invoking "Start-Run" dialog from
your program.
<BR>
<P><TT><FONT COLOR="#CC0000">{</FONT></TT>
<UL><TT><FONT COLOR="#CC0000">IShellDispatch disp; //Create a IShellDispatch
variable</FONT></TT>
<P><TT><FONT COLOR="#CC0000"> WCHAR szValue[80] ;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> CLSID clsid;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> HRESULT sc;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> sc = ::CoCreateInstance(
CLSID_Shell, NULL, CLSCTX_SERVER, IID_IDispatch, (void**)&disp ) ;
//<== Create an instance of the shell</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> if (FAILED (sc))</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> {</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">
CString str;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> str.Format(_T("Failed to create Instance
:-( "));</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">
TRACE( str) ;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> return;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> }</FONT></TT>
<P><TT><FONT COLOR="#CC0000"> disp.FileRun(); //<== Call FileRun</FONT></TT></UL>
<TT><FONT COLOR="#CC0000">}</FONT></TT>
<BR>
<P>Another example for IShellDispatch ,,
<P>The following example is to BrowseForFolder and get the Folder interface
pointer.
<P><TT><FONT COLOR="#CC0000">{</FONT></TT>
<UL><TT><FONT COLOR="#CC0000">IShellDispatch disp;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> IDispatch * iDisp;</FONT></TT>
<P><TT><FONT COLOR="#CC0000"> WCHAR szValue[80] ;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> CLSID clsid;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> HRESULT sc;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> sc = ::CoCreateInstance(
CLSID_Shell, NULL, CLSCTX_SERVER, IID_IDispatch, (void**)&disp ) ;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> if (FAILED (sc))</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> {</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">
CString str;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> str.Format(_T("Failed to create Instance
:-( "));</FONT></TT>
<BR><TT><FONT COLOR="#CC0000">
TRACE( str) ;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> return;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> }</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> VARIANT var;</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> ZeroMemory (&var, sizeof (VARIANT));</FONT></TT>
<P><TT><FONT COLOR="#CC0000"> iDisp = disp.BrowseForFolder(NULL,"Whatever",BIF_RETURNFSANCESTORS|BIF_RETURNONLYFSDIRS,var); </FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> Folder ifolder(iDisp);</FONT></TT>
<BR><TT><FONT COLOR="#CC0000"> CString str = ifolder.GetTitle ();</FONT></TT></UL>
<TT><FONT COLOR="#CC0000">}</FONT></TT>
<P>Of course, There is lot to be researched .. I will be doing it and put
up an update as I get time.. Hope this will be good for the times to come..
<P><A HREF="shelldocvw.zip">Download File</A> (31KB)
<P>
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<CENTER><FONT SIZE=-2>© 1998 Zafir Anjum</FONT> </CENTER>
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<DIV ALIGN=right><FONT SIZE=-1>Contact me: <A HREF="mailto:zafir@home.com">zafir@home.com</A> </FONT></DIV>
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