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   <TITLE>Hide an application from the CTRL-ALT-DEL dialog in Windows 95/98</TITLE>

   <META NAME="Author" CONTENT="Harold Howe">

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<H3>

Hide an application from the CTRL-ALT-DEL dialog in Windows 95/98

</H3>

<P>

One simple way to hide your program from the CTRL-ALT-DEL dialog is to clear the <TT>Application</TT> object's

<TT>Title</TT>. If a program's main window does not have a title, Windows 95 does not put the program in the

CTRL-ALT-DEL dialog. The best place to clear the <TT>Title</TT> property is inside the <TT>WinMain</TT> function.

</P>

<pre>

WINAPI WinMain<b>(</b>HINSTANCE<b>,</b> HINSTANCE<b>,</b> LPSTR<b>,</b> <b>int</b><b>)</b>

<b>{</b>

    <b>try</b>

    <b>{</b>

         Application<b>-></b>Title <b>=</b> <font color="blue">""</font><b>;</b>

         Application<b>-></b>Initialize<b>(</b><b>)</b><b>;</b>

         Application<b>-></b>CreateForm<b>(</b><b>__classid</b><b>(</b>TForm1<b>)</b><b>,</b> <b>&</b>Form1<b>)</b><b>;</b>

         Application<b>-></b>Run<b>(</b><b>)</b><b>;</b>

    <b>}</b>

    <b>catch</b> <b>(</b>Exception <b>&</b>exception<b>)</b>

    <b>{</b>

         Application<b>-></b>ShowException<b>(</b><b>&</b>exception<b>)</b><b>;</b>

    <b>}</b>

    <b>return</b> <font color="blue">0</font><b>;</b>

<b>}</b>

</pre>

<P>

Another way to hide the program is to register it as a service mode program by calling the

<TT>RegisterServiceProcess</TT> API function. <TT>RegisterServiceProcess</TT> is a relatively undocumented

function in <TT>KERNEL32.DLL</TT>. The function is not prototyped in the MS SDK header files, but it can be found

in the Borland import libraries for C++Builder. Apparently, the function's main purpose is to create service-mode

programs. I say <I>apparently</I> because the MSDN says virtually nothing about this function.

</P>

<P>

The code example below demonstrates how to use <TT>RegisterServiceProcess</TT> to hide your program from the

CTRL-ALT-DEL dialog in Windows 95/98.

</P>

<pre>

<font color="navy">//------------Header file------------------------------</font>

<b>typedef</b> DWORD <b>(</b><b>__stdcall</b> <b>*</b>pRegFunction<b>)</b><b>(</b>DWORD<b>,</b> DWORD<b>)</b><b>;</b>



<b>class</b> TForm1 <b>:</b> <b>public</b> TForm

<b>{</b>

<b>__published</b><b>:</b>

    TButton <b>*</b>Button1<b>;</b>

<b>private</b><b>:</b>

    HINSTANCE hKernelLib<b>;</b>

    pRegFunction RegisterServiceProcess<b>;</b>

<b>public</b><b>:</b>

    <b>__fastcall</b> TForm1<b>(</b>TComponent<b>*</b> Owner<b>)</b><b>;</b>

    <b>__fastcall</b> <b>~</b>TForm1<b>(</b><b>)</b><b>;</b>

<b>}</b><b>;</b>





<font color="navy">//-----------CPP file------------------------------</font>

<font color="green">#include "Unit1.h"</font>



<font color="green">#define RSP_SIMPLE_SERVICE     1</font>

<font color="green">#define RSP_UNREGISTER_SERVICE 0</font>



<b>__fastcall</b> TForm1<b>:</b><b>:</b>TForm1<b>(</b>TComponent<b>*</b> Owner<b>)</b>

    <b>:</b> TForm<b>(</b>Owner<b>)</b>

<b>{</b>

    hKernelLib <b>=</b> LoadLibrary<b>(</b><font color="blue">"kernel32.dll"</font><b>)</b><b>;</b>

    <b>if</b><b>(</b>hKernelLib<b>)</b>

    <b>{</b>

        RegisterServiceProcess <b>=</b>

                  <b>(</b>pRegFunction<b>)</b>GetProcAddress<b>(</b>hKernelLib<b>,</b>

                                               <font color="blue">"RegisterServiceProcess"</font><b>)</b><b>;</b>



        <b>if</b><b>(</b>RegisterServiceProcess<b>)</b>

            RegisterServiceProcess<b>(</b>GetCurrentProcessId<b>(</b><b>)</b><b>,</b>

                                   RSP_SIMPLE_SERVICE<b>)</b><b>;</b>

    <b>}</b>

<b>}</b>



<b>__fastcall</b> TForm1<b>:</b><b>:</b><b>~</b>TForm1<b>(</b><b>)</b>

<b>{</b>

    <b>if</b><b>(</b>hKernelLib<b>)</b>

    <b>{</b>

        <b>if</b><b>(</b>RegisterServiceProcess<b>)</b>

            RegisterServiceProcess<b>(</b>GetCurrentProcessId<b>(</b><b>)</b><b>,</b>

                                   RSP_UNREGISTER_SERVICE<b>)</b><b>;</b>



        FreeLibrary<b>(</b>hKernelLib<b>)</b><b>;</b>

    <b>}</b>

<b>}</b>

<font color="navy">//-------------------------------------------------</font>

</pre>

<P>

<B>Note:</B> <TT>RegisterServiceProcess</TT> does not exist on Windows NT.

</P>





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