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<title>Iczelion's Win32 Assembly Tutorial 7: Mouse Input</title>
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<h1>
<font face="Arial,Helvetica"><font color="#999900">Tutorial 7: Mouse Input</font></font></h1></center>
<font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>We will
learn how to receive and respond to mouse input in our window procedure.
The example program will wait for left mouse clicks and display a text
string at the exact clicked spot in the client area.</font></font></font><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1></font></font></font>
<p><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>Download
the example <a href="files/tut07.zip">here</a>.</font></font></font>
<h3>
<font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>Theory:</font></font></font></h3>
<font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>As with
keyboard input, Windows detects and sends notifications about mouse activities
that are relevant to each window. Those activities include left and right
clicks, mouse cursor movement over window, double clicks. Unlike keyboard
input which is directed to the window that has input focus, mouse messages
are sent to any window that the mouse cursor is over, active or not. In
addition, there are mouse messages about the non-client area too. But most
of the time, we can blissfully ignore them. We can focus on those relating
to the client area.</font></font></font>
<br><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>There
are two messages for each mouse button: WM_LBUTTONDOWN,WM_RBUTTONDOWN and
WM_LBUTTONUP, WM_RBUTTONUP messages. For a mouse with three buttons, there
are also WM_MBUTTONDOWN and WM_MBUTTONUP. When the mouse cursor moves over
the client area, Windows sends WM_MOUSEMOVE messages to the window under
the cursor.</font></font></font>
<br><font face="Arial,Helvetica"><font size=-1><font color="#CCCCCC">A
window can receive double click messages, WM_LBUTTONDBCLK or WM_RBUTTONDBCLK,
</font><b><i><font color="#999900">if and only if</font></i></b><font color="#CCCCCC">
its window class has CS_DBLCLKS style flag, else the window will receive
only a series of mouse button up and down messages.</font></font></font>
<br><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>For
all these messages, the value of lParam contains the position of the mouse.
The low word is the x-coordinate, and the high word is the y-coordinate
relative to upper left corner of the client area of the window. wParam
indicates the state of the mouse buttons and Shift and Ctrl keys.</font></font></font>
<br><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1></font></font></font>
<h3>
<font face="Arial,Helvetica"><font color="#CCCCCC"><font size=+0>Example:</font></font></font></h3>
<b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>.386</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>.model
flat,stdcall</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>option
casemap:none</font></font></font></b><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1></font></font></font></b>
<p><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>WinMain
proto :DWORD,:DWORD,:DWORD,:DWORD</font></font></font></b><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1></font></font></font></b>
<p><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>include
\masm32\include\windows.inc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>include
\masm32\include\user32.inc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>include
\masm32\include\kernel32.inc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>include
\masm32\include\gdi32.inc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>includelib
\masm32\lib\user32.lib</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>includelib
\masm32\lib\kernel32.lib</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>includelib
\masm32\lib\gdi32.lib</font></font></font></b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1></font></font></font>
<p><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>.data</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>ClassName
db "SimpleWinClass",0</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>AppName
db "Our First Window",0</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>MouseClick
db 0 ; 0=no click yet</font></font></font></b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1></font></font></font>
<p><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>.data?</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>hInstance
HINSTANCE ?</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>CommandLine
LPSTR ?</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>hitpoint
POINT <></font></font></font></b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1></font></font></font>
<p><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>.code</font></font></font></b>
<br>
<b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>start:</font></font></font></b>
<br>
<b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
invoke GetModuleHandle, NULL</font></font></font></b> <br>
<b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov hInstance,eax</font></font></font></b> <br>
<b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
invoke GetCommandLine<br>
mov CommandLine,eax</font></font></font></b> <br>
<b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
invoke WinMain, hInstance,NULL,CommandLine, SW_SHOWDEFAULT</font></font></font></b>
<br>
<b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
invoke ExitProcess,eax</font></font></font></b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1></font></font></font>
<p><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>WinMain
proc hInst:HINSTANCE,hPrevInst:HINSTANCE,CmdLine:LPSTR,CmdShow:DWORD</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
LOCAL wc:WNDCLASSEX</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
LOCAL msg:MSG</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
LOCAL hwnd:HWND</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov wc.cbSize,SIZEOF WNDCLASSEX</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov wc.style, CS_HREDRAW or CS_VREDRAW</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov wc.lpfnWndProc, OFFSET WndProc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov wc.cbClsExtra,NULL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov wc.cbWndExtra,NULL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
push hInst</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
pop wc.hInstance</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov wc.hbrBackground,COLOR_WINDOW+1</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov wc.lpszMenuName,NULL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov wc.lpszClassName,OFFSET ClassName</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
invoke LoadIcon,NULL,IDI_APPLICATION</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov wc.hIcon,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov wc.hIconSm,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
invoke LoadCursor,NULL,IDC_ARROW</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov wc.hCursor,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
invoke RegisterClassEx, addr wc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
invoke CreateWindowEx,NULL,ADDR ClassName,ADDR AppName,\</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,\</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,\</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
hInst,NULL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
mov hwnd,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
invoke ShowWindow, hwnd,SW_SHOWNORMAL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
invoke UpdateWindow, hwnd</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
.WHILE TRUE</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
invoke GetMessage, ADDR msg,NULL,0,0</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#CCCCCC"><font size=-1>
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