vb if else(VB如何获取FTP上的文件)

专栏 2024-03-28 17:15 493

目录

• vb if else，VB如何获取FTP上的文件？
• 在VB中如何调用数据库？
• 求一个简单的vb小游戏制作代码？
• if小于等于怎么用？
• 为什么说vb中next没有for？
• 按键精灵中if语句怎样使用？
• if语句判断学生成绩等级的VB程序？

vb if else，VB如何获取FTP上的文件？

要用到inet控件。public strData as string '这段可以返回服务器中的第一级目录名，保存在strData中， 如有多个文件夹名每个文件夹名会以空格分开。读取时判段一下。

Inet1.Execute

Inet1.URL, "dir """ & dirName & """" Do DoEvents Loop While

Inet1.StillExecuting

= True msgbox strData '这段是进入目录中，要想获得服务器中所有的文件夹名，就可以用递规的办法来获得。

Inet1.Execute

Inet1.URL, "cd """ & dirName & """" Do DoEvents Loop While

Inet1.StillExecuting

= True Private Sub Inet1_StateChanged(ByVal State As Integer) Select Case State Case 1 StatusBar1.Panels.Item(1)

.Text

= "该控件正在查询所指定的主机的 IP 地址" Case 2 StatusBar1.Panels.Item(1)

.Text

= "该控件已成功地找到所指定的主机的 IP 地址" Case 3 StatusBar1.Panels.Item(1)

.Text

= "该控件正在与主机连接" Case 4 StatusBar1.Panels.Item(1)

.Text

= "该控件已与主机连接成功" Case 5 StatusBar1.Panels.Item(1)

.Text

= "该控件正在向主机发送请求" Case 6 StatusBar1.Panels.Item(1)

.Text

= "该控件发送请求已成功" Case 7 StatusBar1.Panels.Item(1)

.Text

= "该控件正在接收主机的响应" Case 8 StatusBar1.Panels.Item(1)

.Text

= "该控件已成功地接收到主机的响应" Case 9 StatusBar1.Panels.Item(1)

.Text

= "该控件正在解除与主机的连接" Case 10 StatusBar1.Panels.Item(1)

.Text

= "该控件已成功地与主机解除了连接" Case 11 MsgBox "与主机通讯时出现了错误", VBInformation, "个人资料" Case 12 Dim vtData As Variant Dim bDone As Boolean bDone = False '取得第一个块。 vtData = Inet1.GetChunk(1024, icString) DoEvents Do While Not bDone strData = strData & vtData '取得下一个块。 vtData = Inet1.GetChunk(1024, icString) DoEvents If Len(vtData) = 0 Then bDone = True End If Loop StatusBar1.Panels.Item(1)

.Text

= "该请求已经完成，并且所有数据均已接收到" Case Else StatusBar1.Panels.Item(1)

.Text

=

Inet1.ResponseCode

& ": " &

Inet1.ResponseInfo

End Select End Sub 关于inet控件的祥细用法可以看msdn中的帮助。

在VB中如何调用数据库？

PublicFunctionConnectString()_AsStringConnectString="FileDSN=info.dsn;UID=sa;PWD=23"'连接字符器，改成你自己的EndFunctionPublicFunctionExecuteSQL(ByValSQL_AsString,MsgStringAsString)_AsADODB.Recordset'这里是执行SQL语句，你只需要调用这个方法，把SQL查询语句参数传进来，最后返回一个RecordsetDimcnnAsADODB.ConnectionDimrstAsADODB.RecordsetDimsTokens()AsStringOnErrorGoToExecuteSQL_ErrorsTokens=Split(SQL)Setcnn=NewADODB.Connectioncnn.OpenConnectStringIfInStr("INSERT,DELETE,UPDATE",_UCase$(sTokens(0))

)Thencnn.ExecuteSQLMsgString=sTokens(0)&_"querysuccessful"ElseSetrst=NewADODB.Recordsetrst.OpenTrim$(SQL),cnn,_adOpenKeyset,_adLockOptimistic'rst.MoveLast'getRecordCountSetExecuteSQL=rstMsgString="查询到"&rst.RecordCount&_"条记录"EndIfExecuteSQL_Exit:Setrst=NothingSetcnn=NothingExitFunctionExecuteSQL_Error:MsgString="查询错误:"&_Err.DescriptionResumeExecuteSQL_ExitEndFunctionPublicFunctionTesttxt(txtAsString)AsBooleanIfTrim(txt)=""ThenTesttxt=FalseElseTesttxt=TrueEndIfEndFunction

求一个简单的vb小游戏制作代码？

贪吃蛇Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)Dim C As LongIf KeyCode = 27 Then EndIf KeyCode = 32 ThenIf Timer1.Enabled = True ThenTimer1.Enabled = FalseLabel1.Visible = TrueElseTimer1.Enabled = TrueLabel1.Visible = FalseEnd IfEnd IfC = UBound(She)If GFangXiang = True Then Exit SubSelect Case KeyCodeCase 37If She(C).F = 2 Then Exit SubShe(C).F = 0GFangXiang = TrueCase 38If She(C).F = 3 Then Exit SubShe(C).F = 1GFangXiang = TrueCase 39If She(C).F = 0 Then Exit SubShe(C).F = 2GFangXiang = TrueCase 40If She(C).F = 1 Then Exit SubShe(C).F = 3GFangXiang = TrueEnd SelectEnd SubPrivate Sub Form_Load()Me.AutoRedraw = TrueMe.BackColor = &HC000&Me.FillColor = 255Me.FillStyle = 0Me.ScaleWidth = 24Me.ScaleHeight = 24Me.WindowState = 2Set Timer1 = Controls.Add("VB.Timer", "Timer1")Set Label1 = Controls.Add("VB.Label", "Label1")Label1.AutoSize = TrueLabel1.BackStyle = 0Label1 = "暂停"Label1.ForeColor = RGB(255, 255, 0)Label1.FontSize = 50ChuShiHuaEnd SubPrivate Sub Form_Resize()On Error GoTo 1:With MeIf .WindowState <> 1 Then.Cls.ScaleMode = 3HWB = .ScaleHeight / .ScaleWidth.ScaleWidth = 24.ScaleHeight = 24Label1.Move (Me.ScaleWidth /uploads/title/20231231/6590dc9749b67.jpg Label1.Width) / 2, (Me.ScaleHeight /uploads/title/20231231/6590dc9749b67.jpg Label1.Height) / 2HuaTuMe.Line (X, Y)/uploads/title/20231231/6590dc9749b67.jpg(X + 1, Y + 1), RGB(255, 255, 0), BFEnd IfEnd With1:End SubPrivate Sub Timer1_Timer()Dim C As Long, I As LongOn Error GoTo 2:QingChuC = UBound(She)Select Case She(C).FCase 0If ZhuangTai(She(C).X /uploads/title/20231231/6590dc9749b67.jpg 1, She(C).Y) = 2 ThenC = C + 1ReDim Preserve She(C)She(C).F = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).FShe(C).X = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).X /uploads/title/20231231/6590dc9749b67.jpg 1She(C).Y = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).YChanShengShiWuGoTo 1:ElseIf ZhuangTai(She(C).X /uploads/title/20231231/6590dc9749b67.jpg 1, She(C).Y) = 1 ThenGoTo 2:End IfCase 1If ZhuangTai(She(C).X, She(C).Y /uploads/title/20231231/6590dc9749b67.jpg 1) = 2 ThenC = C + 1ReDim Preserve She(C)She(C).F = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).FShe(C).X = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).XShe(C).Y = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).Y /uploads/title/20231231/6590dc9749b67.jpg 1ChanShengShiWuGoTo 1:ElseIf ZhuangTai(She(C).X, She(C).Y /uploads/title/20231231/6590dc9749b67.jpg 1) = 1 ThenGoTo 2:End IfCase 2If ZhuangTai(She(C).X + 1, She(C).Y) = 2 ThenC = C + 1ReDim Preserve She(C)She(C).F = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).FShe(C).X = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).X + 1She(C).Y = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).YChanShengShiWuGoTo 1:ElseIf ZhuangTai(She(C).X + 1, She(C).Y) = 1 ThenGoTo 2:End IfCase 3If ZhuangTai(She(C).X, She(C).Y + 1) = 2 ThenC = C + 1ReDim Preserve She(C)She(C).F = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).FShe(C).X = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).XShe(C).Y = She(C /uploads/title/20231231/6590dc9749b67.jpg 1).Y + 1ChanShengShiWuGoTo 1:ElseIf ZhuangTai(She(C).X, She(C).Y + 1) = 1 ThenGoTo 2:End IfEnd SelectZhuangTai(She(0).X, She(0).Y) = 0For I = 0 To CSelect Case She(I).FCase 0She(I).X = She(I).X /uploads/title/20231231/6590dc9749b67.jpg 1Case 1She(I).Y = She(I).Y /uploads/title/20231231/6590dc9749b67.jpg 1Case 2She(I).X = She(I).X + 1Case 3She(I).Y = She(I).Y + 1End SelectNextTiaoZheng1:GFangXiang = FalseZhuangTai(She(C).X, She(C).Y) = 1HuaTuExit Sub2:If MsgBox("游戏结束，点“是”重新开始游戏，点“否”", vbYesNo, "贪吃蛇") = vbYes ThenChuShiHuaElseEndEnd IfEnd SubPrivate Sub ChuShiHua()Me.ClsTimer1.Enabled = TrueTimer1.Interval = 200Erase ZhuangTaiReDim She(2)She(0).F = 2She(0).X = 9She(0).Y = 11ZhuangTai(9, 11) = 1She(1).F = 2She(1).X = 10She(1).Y = 11ZhuangTai(10, 11) = 1She(2).F = 2She(2).X = 11She(2).Y = 11ZhuangTai(11, 11) = 1HuaTuChanShengShiWuEnd SubPrivate Sub QingChu()Dim I As LongFor I = 0 To UBound(She)Me.Line (She(I).X, She(I).Y)/uploads/title/20231231/6590dc9749b67.jpg(She(I).X + 1, She(I).Y + 1), Me.BackColor, BFNextEnd SubPrivate Sub HuaTu()Dim I As LongFor I = 0 To UBound(She)Me.Circle (She(I).X + 0.5, She(I).Y + 0.5), 0.49, RGB(255, 255, 0), , , HWBNextEnd SubPrivate Sub TiaoZheng()Dim I As LongFor I = 0 To UBound(She) /uploads/title/20231231/6590dc9749b67.jpg 1She(I).F = She(I + 1).FNextEnd SubPrivate Sub ChanShengShiWu()Randomize Timer1:X = Int(Rnd * 24)Y = Int(Rnd * 24)If ZhuangTai(X, Y) > 0 Then GoTo 1:ZhuangTai(X, Y) = 2Me.Line (X, Y)/uploads/title/20231231/6590dc9749b67.jpg(X + 1, Y + 1), RGB(255, 255, 0), BFEnd Sub

if小于等于怎么用？

If...Then...Else... End If语句 根据表达式的值，有条件地执行一组语句。

示例：

Dim aa as String '定义一个字符变量

aa="123" '字符变量定义

If aa="123" Then '判断aa的值是否与字符"123"相同

Msgbox "aa的内容是123。"

Else

Msgbox "aa的内容不是123。"

End If

为什么说vb中next没有for？

因为For循环内的if没有end if。改为：For i = 1 To 100If isnarc(a(i)) = True Thensum = sum + a(i)end ifNext i或：For i = 1 To 100If isnarc(a(i)) = True Then sum = sum + a(i)Next i扩展资料：If与End If是成对出现的（除非写在同一行的就不用End If），如果不成对（比如有4个If，却只有3个End If），就会影响到它外围的其他结构体比如For Next循环。一、如果是单行的IF，后面不能接END IF，比如说If 5 > 3 Then MsgBox "yes"如果是多行的就必须要有end if，比如：if a=3 thenb=2end if二、加else跟上面一样，如果是单行的，可以是If 5 > 8 Then MsgBox "yes" Else MsgBox "no"多行的if then else 类似这种if a=3 thenb=2else b=1end if

按键精灵中if语句怎样使用？

在按键精灵中，if语句可以用于判断某个条件是否成立，若条件成立则执行一段代码。使用if语句的基本语法如下：

```

if (条件表达式) {

// 条件成立时要执行的代码

}

```

其中，条件表达式是一个返回布尔值（true或false）的表达式。

例如，以下代码使用if语句来判断当前时间是否是下班时间，如果是，则模拟按下“关机”键；如果不是，则等待指定时长后再次检查：

```

while(true) {

if (get_time() >= "18:00:00" && get_time() <= "23:59:59") {

// 如果当前时间介于18:00:00和23:59:59之间，则执行关机操作

key_press("Alt", "F4");

delay(1000);

key_press("Enter");

break;

} else {

// 如果当前时间不在指定范围内，则等待30分钟后再次检查

delay(30 * 60 * 1000);

}

}

```

在以上代码中，`get_time()`是一个返回当前时间的函数，`key_press()`函数用于模拟按键操作，`delay()`函数用于等待指定的时间。这段代码会不断检查当前时间，直到某个条件成立后才退出循环。

if语句判断学生成绩等级的VB程序？

cj=60

if cj<60 then

MsgBox ("成绩不合格")

elseif cj>=60 and cj <80 then

MsgBox ("成绩为良")

elseif cj>80 then

MsgBox ("成绩为优秀")

end if

这是用vb的if语句来判断学生成绩。

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