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<title>Iczelion's Win32 Assembly Tutorial 26: Splash Screen</title>
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<h1>
<font face="Arial,Helvetica"><font color="#FFFF99">Tutorial 26: Splash
Screen</font></font></h1></center>
<font face="Arial,Helvetica"><font size=-1>Now that we know how to use
a bitmap, we can progress to a more creative use of it. Splash screen.
Download <a href="files/tut26.zip">the example</a>.</font></font>
<h3>
<b><font face="Arial,Helvetica"><font color="#FFCC33">Theory</font></font></b></h3>
<font face="Arial,Helvetica"><font size=-1>A splash screen is a window
that has no title bar, no system menu box, no border that displays a bitmap
for a while and then disappears automatically. It's usually used during
program startup, to display the program's logo or to distract the user's
attention while the program does some lengthy initialization. We will implement
a splash screen in this tutorial.</font></font>
<br><font face="Arial,Helvetica"><font size=-1>The first step is to include
the bitmap in the resource file. However, if you think of it, it's
a waste of precious memory to load a bitmap that will be used only once
and keep it in memory till the program is closed. A better solution is
to create a *resource* DLL which contains the bitmap and has the sole purpose
of displaying the splash screen. This way, you can load the DLL when you
want to display the splash screen and unload it when it's not necessary
anymore. So we will have two modules: the main program and the splash DLL.
We will put the bitmap into the DLL's resource.</font></font>
<br><font face="Arial,Helvetica"><font size=-1>The general scheme is as
follows:</font></font>
<ol>
<li>
<font face="Arial,Helvetica"><font size=-1>Put the bitmap into the DLL
as a bitmap resource</font></font></li>
<li>
<font face="Arial,Helvetica"><font size=-1>The main program calls LoadLibrary
to load the dll into memory</font></font></li>
<li>
<font face="Arial,Helvetica"><font size=-1>The DLL entrypoint function
of the DLL is called. It will create a timer and set the length of time
that the splash screen will be displayed. Next it will register and
create a window without caption and border and display the bitmap in the
client area.</font></font></li>
<li>
<font face="Arial,Helvetica"><font size=-1>When the specified length of
time elapsed, the splash screen is removed from the screen and the control
is returned to the main program</font></font></li>
<li>
<font face="Arial,Helvetica"><font size=-1>The main program calls FreeLibrary
to unload the DLL from memory and then goes on with whatever task it is
supposed to do.</font></font></li>
</ol>
<font face="Arial,Helvetica"><font size=-1>We will examine the mechanisms
in detail.</font></font>
<h3>
<font face="Arial,Helvetica"><font color="#66FFFF"><font size=+0>Load/Unload
DLL</font></font></font></h3>
<font face="Arial,Helvetica"><font size=-1>You can dynamically load a DLL
with LoadLibrary function which has the following syntax:</font></font>
<blockquote><font face="Arial,Helvetica">LoadLibrary proto lpDLLName:DWORD</font></blockquote>
<font face="Arial,Helvetica"><font size=-1>It takes only one parameter:
the address of the name of the DLL you want to load into memory. If the
call is successful, it returns the module handle of the DLL else it returns
NULL.</font></font>
<br><font face="Arial,Helvetica"><font size=-1>To unload a DLL, call FreeLibrary:</font></font>
<blockquote><font face="Arial,Helvetica">FreeLibrary proto
hLib:DWORD</font></blockquote>
<font face="Arial,Helvetica"><font size=-1>It takes one parameter: the
module handle of the DLL you want to unload. Normally, you got that handle
from LoadLibrary</font></font>
<h3>
<b><font face="Arial,Helvetica"><font color="#66FFFF"><font size=+0>How
to use a timer</font></font></font></b></h3>
<font face="Arial,Helvetica"><font size=-1>First, you must create a timer
first with SetTimer:</font></font>
<blockquote><font face="Arial,Helvetica"><font size=-1>SetTimer proto
hWnd:DWORD, TimerID:DWORD, uElapse:DWORD, lpTimerFunc:DWORD</font></font>
<p><font face="Arial,Helvetica"><font size=-1><b><font color="#FFFF99">hWnd</font></b>
is the handle of a window that will receive the timer notification message.
This parameter can be NULL to specify that there is no window that's associated
with the timer.</font></font>
<br><font face="Arial,Helvetica"><font size=-1><b><font color="#FFFF99">TimerID</font></b>
is a user-defined value that is used as the ID of the timer.</font></font>
<br><font face="Arial,Helvetica"><font size=-1><b><font color="#FFFF99">uElapse
</font></b>is
the time-out value in milliseconds.</font></font>
<br><font face="Arial,Helvetica"><font size=-1><b><font color="#FFFF99">lpTimerFunc
</font></b>is
the address of a function that will process the timer notification messages.
If you pass NULL, the timer messages will be sent to the window specified
by hWnd parameter.</font></font>
<p><font face="Arial,Helvetica"><font size=-1>SetTimer returns the ID of
the timer if successful. Otherwise it returns NULL. So it's best not to
use the timer ID of 0.</font></font></blockquote>
<font face="Arial,Helvetica"><font size=-1>You can create a timer in two
ways:</font></font>
<ul>
<li>
<font face="Arial,Helvetica"><font size=-1>If you have a window and you
want the timer notification messages to go to that window, you must pass
all four parameters to SetTimer (the lpTimerFunc must be NULL)</font></font></li>
<li>
<font face="Arial,Helvetica"><font size=-1>If you don't have a window or
you don't want to process the timer messages in the window procedure, you
must pass NULL to the function in place of a window handle. You must also
specify the address of the timer function that will process the timer messages.</font></font></li>
</ul>
<font face="Arial,Helvetica"><font size=-1>We will use the first approach
in this example.</font></font>
<br><font face="Arial,Helvetica"><font size=-1>When the time-out period
elapses, WM_TIMER message is sent to the window that is associated with
the timer. For example, if you specify uElapse of 1000, your window will
receive WM_TIMER every second.</font></font>
<br><font face="Arial,Helvetica"><font size=-1>When you don't need the
timer anymore, destroy it with KillTimer:</font></font>
<blockquote><font face="Arial,Helvetica"><font size=-1>KillTimer
proto hWnd:DWORD, TimerID:DWORD</font></font></blockquote>
<h3>
<b><font face="Arial,Helvetica"><font color="#FFCC33">Example:</font></font></b></h3>
<tt>;-----------------------------------------------------------------------</tt>
<br><tt>;
The main program</tt>
<br><tt>;-----------------------------------------------------------------------</tt>
<br><tt>.386</tt>
<br><tt>.model flat,stdcall</tt>
<br><tt>option casemap:none</tt>
<br><tt>include \masm32\include\windows.inc</tt>
<br><tt>include \masm32\include\user32.inc</tt>
<br><tt>include \masm32\include\kernel32.inc</tt>
<br><tt>includelib \masm32\lib\user32.lib</tt>
<br><tt>includelib \masm32\lib\kernel32.lib</tt>
<p><tt>WinMain proto :DWORD,:DWORD,:DWORD,:DWORD</tt>
<p><tt>.data</tt>
<br><tt>ClassName db "SplashDemoWinClass",0</tt>
<br><tt>AppName db "Splash Screen Example",0</tt>
<br><b><tt><font color="#66FF99">Libname db "splash.dll",0</font></tt></b>
<p><tt>.data?</tt>
<br><tt>hInstance HINSTANCE ?</tt>
<br><tt>CommandLine LPSTR ?</tt>
<br><tt>.code</tt>
<br><tt>start:</tt>
<br><b><tt><font color="#66FF99"> invoke LoadLibrary,addr Libname</font></tt></b>
<br><b><tt><font color="#66FF99"> .if eax!=NULL</font></tt></b>
<br><b><tt><font color="#66FF99"> invoke FreeLibrary,eax</font></tt></b>
<br><b><tt><font color="#66FF99"> .endif</font></tt></b>
<br><tt> invoke GetModuleHandle, NULL</tt>
<br><tt> mov hInstance,eax</tt>
<br><tt> invoke GetCommandLine</tt>
<br><tt> mov CommandLine,eax</tt>
<br><tt> invoke WinMain, hInstance,NULL,CommandLine, SW_SHOWDEFAULT</tt>
<br><tt> invoke ExitProcess,eax</tt>
<p><tt>WinMain proc hInst:HINSTANCE,hPrevInst:HINSTANCE,CmdLine:LPSTR,CmdShow:DWORD</tt>
<br><tt> LOCAL wc:WNDCLASSEX</tt>
<br><tt> LOCAL msg:MSG</tt>
<br><tt> LOCAL hwnd:HWND</tt>
<br><tt> mov wc.cbSize,SIZEOF WNDCLASSEX</tt>
<br><tt> mov wc.style, CS_HREDRAW or CS_VREDRAW</tt>
<br><tt> mov wc.lpfnWndProc, OFFSET WndProc</tt>
<br><tt> mov wc.cbClsExtra,NULL</tt>
<br><tt> mov wc.cbWndExtra,NULL</tt>
<br><tt> push hInstance</tt>
<br><tt> pop wc.hInstance</tt>
<br><tt> mov wc.hbrBackground,COLOR_WINDOW+1</tt>
<br><tt> mov wc.lpszMenuName,NULL</tt>
<br><tt> mov wc.lpszClassName,OFFSET ClassName</tt>
<br><tt> invoke LoadIcon,NULL,IDI_APPLICATION</tt>
<br><tt> mov wc.hIcon,eax</tt>
<br><tt> mov wc.hIconSm,eax</tt>
<br><tt> invoke LoadCursor,NULL,IDC_ARROW</tt>
<br><tt> mov wc.hCursor,eax</tt>
<br><tt> invoke RegisterClassEx, addr wc</tt>
<br><tt> INVOKE CreateWindowEx,NULL,ADDR ClassName,ADDR AppName,\</tt>
<br><tt> WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,\</tt>
<br><tt> CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,\</tt>
<br><tt> hInst,NULL</tt>
<br><tt> mov hwnd,eax</tt>
<br><tt> invoke ShowWindow, hwnd,SW_SHOWNORMAL</tt>
<br><tt> invoke UpdateWindow, hwnd</tt>
<br><tt> .while TRUE</tt>
<br><tt> invoke GetMessage, ADDR msg,NULL,0,0</tt>
<br><tt> .break .if (!eax)</tt>
<br><tt> invoke TranslateMessage, ADDR msg</tt>
<br><tt> invoke DispatchMessage, ADDR msg</tt>
<br><tt> .endw</tt>
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