tut16.html

WINDOWS程序员使用指南--汇编基础

.endif</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
.endif</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFF99"><font size=-1>&nbsp;&nbsp;&nbsp;
.ELSEIF uMsg==WM_FINISH</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke MessageBox,NULL,ADDR SuccessString,ADDR AppName,MB_OK</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFF99"><font size=-1>&nbsp;&nbsp;&nbsp;
.ELSE</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke DefWindowProc,hWnd,uMsg,wParam,lParam</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
ret</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFF99"><font size=-1>.ENDIF</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFF99"><font size=-1>&nbsp;&nbsp;&nbsp;
xor&nbsp;&nbsp;&nbsp; eax,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFF99"><font size=-1>&nbsp;&nbsp;&nbsp;
ret</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFF99"><font size=-1>WndProc
endp</font></font></font></b><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>ThreadProc
PROC USES ecx Param:DWORD</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke WaitForSingleObject,hEventStart,INFINITE</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
mov&nbsp; ecx,600000000</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
.WHILE ecx!=0</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
.if EventStop!=TRUE</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
add&nbsp; eax,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
dec&nbsp; ecx</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
.else</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke MessageBox,hwnd,ADDR StopString,ADDR AppName,MB_OK</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
mov&nbsp; EventStop,FALSE</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
jmp ThreadProc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
.endif</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
.ENDW</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke PostMessage,hwnd,WM_FINISH,NULL,NULL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke EnableMenuItem,hMenu,IDM_START_THREAD,MF_ENABLED</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke EnableMenuItem,hMenu,IDM_STOP_THREAD,MF_GRAYED</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
jmp&nbsp;&nbsp; ThreadProc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
ret</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>ThreadProc
ENDP</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFF99"><font size=-1>end
start</font></font></font></b>
<h3>
<b><font face="Arial,Helvetica"><font color="#33FF33"><font size=+0>Analysis:</font></font></font></b></h3>
<font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>In this
example, I demonstrate another thread technique.</font></font></font><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;
.IF uMsg==WM_CREATE</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke CreateEvent,NULL,FALSE,FALSE,NULL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
mov&nbsp; hEventStart,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
mov&nbsp; eax,OFFSET ThreadProc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke CreateThread,NULL,NULL,eax,\</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
NULL,0,\</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
ADDR ThreadID</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke CloseHandle,eax</font></font></font></b><font face="Arial,Helvetica"><font size=-1></font></font>
<p><font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>You
can see that I create the event object and the thread during the processing
of WM_CREATE message. I create the event object in the nonsignalled state
with automatic reset. After the event object is created, I create the thread.
However the thread doesn't run immediately because it waits for the event
object to be in the signalled state as the code below:</font></font></font><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>ThreadProc
PROC USES ecx Param:DWORD</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke WaitForSingleObject,hEventStart,INFINITE</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
mov&nbsp; ecx,600000000</font></font></font></b><font face="Arial,Helvetica"><font size=-1></font></font>
<p><font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>The
first line of the thread procedure is the call to WaitForSingleObject.
It waits infinitely for the signalled state of the event object before
it returns. This means that even when the thread is created, we put it
into a dormant state.</font></font></font>
<br><font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>When
the user selects "run thread" command from the menu, we set the event object
into signalled state as below:</font></font></font><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
.if ax==IDM_START_THREAD</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke SetEvent,hEventStart</font></font></font></b><font face="Arial,Helvetica"><font size=-1></font></font>
<p><font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>The
call to SetEvent turns the event object into the signalled state which
in turn makes the WaitForSingleObject call in the thread procedure return
and the thread starts running. When the user selects "stop thread" command,&nbsp;
we set the value of the global variable "EventStop" to TRUE.</font></font></font><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
.if EventStop==FALSE</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
add&nbsp; eax,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
dec&nbsp; ecx</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
.else</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
invoke MessageBox,hwnd,ADDR StopString,ADDR AppName,MB_OK</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
mov&nbsp; EventStop,FALSE</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
jmp ThreadProc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
.endif</font></font></font></b><font face="Arial,Helvetica"><font size=-1></font></font>
<p><font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>This
stops the thread and jumps to the WaitForSingleObject call again. Note
that we don't have to manually reset the event object into nonsignalled
state because we specify the bManualReset parameter of the CreateEvent
call as FALSE.</font></font></font>
<br>
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