VB中 byte数组和其他数据类型之间的转化
2007-11-21 13:09
561 查看
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
Private Sub Command1_Click()
Dim test(0 To 3) As Byte
Dim i As Long, j As Long
i = 1000
'从long转化为byte数组
CopyMemory test(0), i, 4
'从byte数组转化为long
CopyMemory j, test(0), 4
MsgBox j
End Sub
或者根据下面的代码中的函数进行转换:
Public Function HiByte(ByVal wParam As Integer) As Byte
'note: VB4-32 users should declare this function As Integer
HiByte = (wParam And &HFF00&) / (&H100)
End Function
Public Function LoByte(ByVal wParam As Integer) As Byte
'note: VB4-32 users should declare this function As Integer
LoByte = wParam And &HFF&
End Function
Public Function HiWord(wParam As Long) As Integer
If wParam And &H80000000 Then
HiWord = (wParam / 65535) - 1
Else
HiWord = wParam / 65535
End If
End Function
Public Function LoWord(wParam As Long) As Integer
If wParam And &H8000& Then
LoWord = &H8000& Or (wParam And &H7FFF&)
Else
LoWord = wParam And &HFFFF&
End If
End Function
Public Function LoWordCM(wParam As Long) As Integer
'using API
CopyMemory LoWordCM, wParam, 2
End Function
Public Function LShiftWord(ByVal w As Integer, ByVal c As Integer) As Integer
Dim dw As Long
dw = w * (2 ^ c)
If dw And &H8000& Then
LShiftWord = CInt(dw And &H7FFF&) Or &H8000&
Else
LShiftWord = dw And &HFFFF&
End If
End Function
Public Function RShiftWord(ByVal w As Integer, ByVal c As Integer) As Integer
Dim dw As Long
If c = 0 Then
RShiftWord = w
Else
dw = w And &HFFFF&
dw = dw / (2 ^ c)
RShiftWord = dw And &HFFFF&
End If
End Function
'两个byte转换为一个integer
Public Function MakeWord(ByVal bHi As Byte, ByVal bLo As Byte) As Integer
If bHi And &H80 Then
MakeWord = (((bHi And &H7F) * 256) + bLo) Or &H8000&
Else
MakeWord = (bHi * 256) + bLo
End If
End Function
'两个integer转换为一个long
Public Function MakeDWord(wHi As Integer, wLo As Integer) As Long
If wHi And &H8000& Then
MakeDWord = (((wHi And &H7FFF&) * 65536) Or _
(wLo And &HFFFF&)) Or &H80000000
Else
MakeDWord = (wHi * 65535) + wLo
End If
End Function
相关文章推荐
- byte数组和其他数据类型之间的转化
- java常用类String与其他数据类型之间的转化
- 【语言基础】c++ 基本数据类型与字节数组(string,char [] )之间的转化方法
- Java之——基本数据类型与byte数组相互转化
- Java之——基本数据类型与byte数组相互转化
- delphi中如何将string类型的字符串数据转化成byte[]字节数组类型的数据
- 不同类型数组之间的数据拷贝
- bit/byte/英文字符/汉字之间的换算及java八大基本数据类型的占字节数
- byte与其他类型之间的强制转换
- java基本数据类型转换成byte[]数组
- java中byte类型与其他数据类型转换
- JAVA 对象 & byte数组之间转化
- JavaScript的数据类型,运算符及数据类型之间的转化
- JAVA中int型数据和byte数组之间的相互转换
- String类型和Byte以及Byte数组之间的转换
- byte数组转float 以及byte转其他类型时为什么要&0xff
- 不同数据类型以及指针之间的转化
- VB与C++之间数据类型的对应关系
- byte数组和流 Seralizable:Android基础 -- Activity之间传递数据(bitmap和map对象)
- 字符串数据类型与其他类型之间的转换