faq4.htm

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   <TITLE>Hide the application's taskbar icon</TITLE>

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

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<H3>

Hide the application's taskbar icon<BR>

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<P>

First, let's get some terminology straight. The system tray is the little box

in the corner of the task bar where programs can display small icons. Some examples include

the SysAgent icon, and the Outlook icon when you get new mail. The taskbar is the toolbar that

stretches across the screen. This is where program icons are located. To hide a program's taskbar

icon, you call the <TT>ShowWindow</TT> function and pass the <TT>Application-&gt;Handle</TT>

window handle.</P>

<pre>

ShowWindow<b>(</b>Application<b>-></b>Handle<b>,</b> SW_HIDE<b>)</b><b>;</b>

</pre>

<P>

To make the taskbar icon re-appear, simply change <TT>SW_HIDE</TT> to <TT>SW_SHOW</TT>.

</P>

<pre>

ShowWindow<b>(</b>Application<b>-></b>Handle<b>,</b> SW_SHOW<b>)</b><b>;</b>

</pre>

<P>

<B>Note:</B> You can hide the main form by setting its <TT>Visible</TT> property to false.

</P>

<P>

<B>Note:</B> Hiding the form's taskbar icon with <TT>ShowWindow</TT> is not permanent. Certain actions will cause the

taskbar icon to reappear. You can remove a program's taskbar icon and prevent it from ever appearing again by making

the hidden application window a tool window. Tool windows never have a taskbar icon. Making the application window a tool

window has the side effect of removing the program from the list of programs that appear when the user presses ALT-TAB.

You can make the application window a tool window by calling the API <TT>GetWindowLong</TT> and <TT>SetWindowLong</TT>

functions.

</P>

<pre>

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

<b>{</b>

    DWORD dwExStyle <b>=</b> GetWindowLong<b>(</b>Application<b>-></b>Handle<b>,</b> GWL_EXSTYLE<b>)</b><b>;</b>

    dwExStyle <b>|=</b> WS_EX_TOOLWINDOW<b>;</b>

    SetWindowLong<b>(</b>Application<b>-></b>Handle<b>,</b> GWL_EXSTYLE<b>,</b> dwExStyle<b>)</b><b>;</b>



    <b>try</b>

    <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>





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