Dim url As String=" 网址"
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Dim httpReq As System.Net.HttpWebRequest
Dim httpResp As System.Net.HttpWebResponse
Dim httpURL As New System.Uri(url)
httpReq = CType(WebRequest.Create(httpURL), HttpWebRequest)
httpReq.Method = "GET"
httpResp = CType(httpReq.GetResponse(), HttpWebResponse)
httpReq.KeepAlive = False ' 获取或设置一个值，该值指示是否与
Internet资源建立持久连接。
Dim reader As StreamReader = _
New StreamReader(httpResp.GetResponseStream,
System.Text.Encoding.GetEncoding(-0))
Dim respHTML As String = reader.ReadToEnd() 'respHTML就是网页源代码
vb点虐 的话
For
Each
sp
As
String
In
My.Computer.Ports.SerialPortNames
cbxport.Items.Add(sp)
Next
vb6.0的话要调用API查看串口相关信息存在的注册表。
HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM
通过读注册表的方法获得串口数量，当然也可以获得串口号了。
Option
Explicit
Private
Declare
Function
RegOpenKey
Lib
"advapi32.dll
"
Alias
"RegOpenKeyA
"
(ByVal
hKey
As
Long,
ByVal
lpSubKey
As
String,
phkResult
As
Long)
As
Long
Private
Declare
Function
RegQueryInfoKey
Lib
"advapi32.dll
"
Alias
"RegQueryInfoKeyA
"
(ByVal
hKey
As
Long,
ByVal
lpClass
As
String,
lpcbClass
As
Long,
ByVal
lpReserved
As
Long,
lpcSubKeys
As
Long,
lpcbMaxSubKeyLen
As
Long,
lpcbMaxClassLen
As
Long,
lpcValues
As
Long,
lpcbMaxValueNameLen
As
Long,
lpcbMaxValueLen
As
Long,
lpcbSecurityDescriptor
As
Long,
lpftLastWriteTime
As
Long)
As
Long
Private
Const
HKEY_LOCAL_MACHINE
=
H80000002
'
获得当前系统的
COM
口的数量
Function
GetCOMCount()
As
Integer
Dim
ret
As
Long,
cntCOM
As
Long
RegOpenKey
HKEY_LOCAL_MACHINE,
"HARDWARE\DEVICEMAP\SERIALCOMM
",
ret
RegQueryInfoKey
ret,
"
",
0,
0,
0,
0,
0,
cntCOM,
0,
0,
0,
GetCOMCount
=
cntCOM
End
Function
Private
Sub
Command1_Click()
MsgBox
"您的机器有
"
GetCOMCount
"
个串口。
",
vbOKOnly,
"串口数量
"
End
Sub
下面这段代码，是我用来计算每个月存500元进银行，连续30年，最后连本带利能有多少钱。这里面涉及复利计算。界面中右边的文本框用来输出每一次计算的结果。
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim nianxian As Integer '年限变量
Dim dingcun As Integer '定存变量
Dim fuli_big As Long '大复利
Dim fuli_small As Long '小复利
Dim i As Integer '循环变量
Dim DATAstring As String '数据字符串
nianxian = Val(年限_TextBox.Text)
dingcun = Val(定存_TextBox.Text)
DATAstring = ""
For i = 1 To nianxian
fuli_small = dingcun * (1 + 0.1875)
dingcun = fuli_small
fuli_big = fuli_big + fuli_small
DATAstring = DATAstring + "[" + Trim(Str(i)) + "]" + Str(fuli_big) + Chr(13) + Chr(10)
'DATAstring = DATAstring + "[" + Trim(Str(i)) + "]" + Str(fuli_small) + Chr(13) + Chr(10)
Next
'fuli_big = fuli_small
TextBox1.Text = DATAstring
结果_TextBox.Text = Str(fuli_big) + "元"
End Sub
