📄 例8-2.mht
字号:
ily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>】编=
写一个用来延迟指定=
6102;间（秒）的</span><span
lang=3DEN-US>Sub</span><span style=3D'font-family:SimSun;mso-ascii-font-fam=
ily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>过程=
。通过调用该过程，=
5353;指定的时间间隔显ట=
4;若干行信息。</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span style=3D'mso-spacerun:yes'>&n=
bsp;
</span><span style=3D'mso-bidi-font-weight:bold'><span
style=3D'mso-spacerun:yes'> </span></span></span><span style=3D'font-f=
amily:
SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times=
New Roman";
mso-bidi-font-weight:bold'>分析：</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>用</span><span lang=3DEN-US>For...Next</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>循环可以实现时=
间延迟，但不精确。=
2312;此使用</span><span
lang=3DEN-US>VB</span><span style=3D'font-family:SimSun;mso-ascii-font-fami=
ly:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>的内部函&#=
25968;</span><span
lang=3DEN-US>Timer</span><span style=3D'font-family:SimSun;mso-ascii-font-f=
amily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>来编=
写较为精确的时间延=
6831;过程。</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span>Timer</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>函数返回系统时=
钟从午夜开始计算的=
1186;数，把</span><span
lang=3DEN-US>Timer</span><span style=3D'font-family:SimSun;mso-ascii-font-f=
amily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>加上=
需要延迟的时间（秒=
5289;作为循环结束的时໾=
8;，当</span><span
lang=3DEN-US>Timer</span><span style=3D'font-family:SimSun;mso-ascii-font-f=
amily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>超过=
该时间时结束循环，=
1363;停止时间延迟，用๢=
5;种方法可以得到精确&=
#30340;时间延迟。</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>设计步骤如下：=
</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>①</span> <span style=3D'font-family:SimSun;mso-asc=
ii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>为了=
简化操作，直接在窗=
0307;上输出。</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>②</span> <span style=3D'font-family:SimSun;mso-asc=
ii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>编写=
通用事件过程代码：</s=
pan></p>
<p class=3Da><b><span lang=3DEN-US>Static Sub <span class=3DSpellE>delayloo=
p</span>(<span
class=3DSpellE>delaytime</span>)<o:p></o:p></span></b></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>Const <span
class=3DSpellE>secinday</span> =3D 24& * 60& * 60&<span
style=3D'mso-spacerun:yes'> </span><span
style=3D'mso-tab-count:2'> &=
nbsp; </span><span
style=3D'mso-tab-count:2'> &=
nbsp; </span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>一整天的&#=
31186;数</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan><span
class=3DSpellE>loopfinish</span> =3D Timer + <span class=3DSpellE>delaytime=
</span><span
style=3D'mso-spacerun:yes'> </span><span style=3D'mso-tab-count:5'>&n=
bsp;  =
; &n=
bsp; </span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>计算完成&#=
26102;间</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>If <span
class=3DSpellE>loopfinish</span> > <span class=3DSpellE>secinday</span>
Then<span style=3D'mso-spacerun:yes'> </span><span
style=3D'mso-tab-count:5'> &=
nbsp; &nbs=
p; &=
nbsp; </span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>如果延迟&#=
26102;间从午夜前开始</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> &nbs=
p;
</span><span class=3DSpellE>loopfinish</span> =3D <span class=3DSpellE>loop=
finish</span>
– <span class=3DSpellE>secinday</span></span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> &nbs=
p;
</span>Do While Timer > <span class=3DSpellE>loopfinish</span><span
style=3D'mso-spacerun:yes'> </span><span style=3D'mso-tab=
-count:
5'> =
&nb=
sp; =
</span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>利用空循&#=
29615;实现延迟</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> &nbs=
p;
</span><st1:place w:st=3D"on">Loop</st1:place></span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>End If</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>Do
While Timer < <span class=3DSpellE>loopfinish</span><span
style=3D'mso-spacerun:yes'> </span><span style=3D'mso-tab=
-count:
5'> =
&nb=
sp; =
</span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>利用空循&#=
29615;实现延迟</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan><st1:place
w:st=3D"on">Loop</st1:place></span></p>
<p class=3Da><b><span lang=3DEN-US>End Sub<o:p></o:p></span></b></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>一般情况下，</span><=
span
lang=3DEN-US>Timer</span><span style=3D'font-family:SimSun;mso-ascii-font-f=
amily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>比</span><=
span
class=3DSpellE><span lang=3DEN-US>loopfinish</span></span><span style=3D'fo=
nt-family:
SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times=
New Roman"'>要小，因此可以ஷ=
2;</span></p>
<p class=3Da><span lang=3DEN-US>Do While Timer < <span class=3DSpellE>lo=
opfinish</span></span></p>
<p class=3Da><st1:place w:st=3D"on"><span lang=3DEN-US>Loop</span></st1:pla=
ce></p>
<p class=3DMsoNormal><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>来控制时&#=
38388;延迟。但是，如果ą=
02;间延迟从午夜前开始=
，到午夜后才结束，=
1017;</span><span
lang=3DEN-US>Timer</span><span style=3D'font-family:SimSun;mso-ascii-font-f=
amily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>从</span><=
span
lang=3DEN-US>0</span><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>开始起算&#=
65292;在这种情况下，必Ɔ=
35;用</span></p>
<p class=3Da><span lang=3DEN-US>Do While Timer > <span class=3DSpellE>lo=
opfinish</span></span></p>
<p class=3Da><st1:place w:st=3D"on"><span lang=3DEN-US>Loop</span></st1:pla=
ce></p>
<p class=3DMsoNormal><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>来控制时&#=
38388;延迟。</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>用上面的</span><span class=3DSpe=
llE><span
lang=3DEN-US>delayloop</span></span><span style=3D'font-family:SimSun;mso-a=
scii-font-family:
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