在Visual Basic (VB) 中编程操作银行卡(通常指IC卡)通常涉及以下步骤:
获取IC卡读写器及其接口资料
购买一个IC卡读写器,并获取其提供的二次开发资料。这些资料通常包含用于读写IC卡的函数和接口信息。
使用VC(Visual C++)封装读卡器提供的函数
将读卡器厂商提供的函数重新封装成一个动态链接库(DLL)。这样,在上位软件中,你可以通过调用这个动态库中的函数来实现对IC卡的读写操作。
在VB中调用动态库
在VB中,你可以使用平台调用(P/Invoke)技术来调用动态库中的函数。首先,需要声明外部函数,然后加载动态库,并调用相应的函数来实现IC卡的读写操作。
```vb
' 声明外部函数
Private Declare Function OpenComm Lib "your_dll_name.dll" (ByVal port As String, ByVal baudRate As Long) As Long
Private Declare Function CloseComm Lib "your_dll_name.dll" (ByVal port As String) As Long
Private Declare Function CheckReader Lib "your_dll_name.dll" (ByVal port As String) As Long
' 加载动态库
Private Declare Sub LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal dllToLoad As String)
Private Declare Function FreeLibrary Lib "kernel32" (ByVal hLib As Long) As Long
' 打开串口
Private Sub OpenPort(portName As String, baudRate As Long)
Dim hComm As Long
hComm = OpenComm(portName, baudRate)
If hComm = 0 Then
MsgBox "Failed to open port: " & portName
Else
MsgBox "Port opened successfully: " & portName
End If
End Sub
' 关闭串口
Private Sub ClosePort(portName As String)
Dim hComm As Long
hComm = CloseComm(portName)
If hComm = 0 Then
MsgBox "Failed to close port: " & portName
Else
MsgBox "Port closed successfully: " & portName
End If
End Sub
' 检测读写器
Private Sub CheckCardReader(portName As String)
Dim readerStatus As Long
readerStatus = CheckReader(portName)
If readerStatus = 0 Then
MsgBox "Reader is not detected."
Else
MsgBox "Reader is detected."
End If
End Sub
' 示例调用
Private Sub Command1_Click()
LoadLibrary "your_dll_name.dll" ' 加载动态库
OpenPort "COM1", 9600 ' 打开串口,设置波特率为9600
CheckCardReader "COM1" ' 检测读写器
ClosePort "COM1" ' 关闭串口
FreeLibrary "your_dll_name.dll" ' 释放动态库
End Sub
```
请注意,这只是一个示例,实际应用中可能需要根据具体的读写器型号和接口资料进行相应的调整。确保你有正确的动态库文件,并且所有声明的函数和变量都与实际使用的读写器兼容。