GSM-Track 开发日志 GSM-Track开发 STEP 2

 恩,第一版本的CELLID LAC转化地球坐标位置已经做好了,其实是个非常简单的测试.

原理基本是 通过手机得到 cellid和lac信息,也就是我们说的基站信息,然后根据这个提交给google的手机map接口,得到返回值就是坐标位置.

下面是部分VB的代码

LAC和CELLID作为Stream类型 传到google接口里面

    Dim xmlstream
    Set xmlstream = CreateObject("ADODB.Stream")
    xmlstream.Mode = 3
    xmlstream.open
    xmlstream.Type = 1
    xmlstream.Write buffer
    xmlstream.SetEOS
    xmlstream.position = 0

    Dim bufTmp() As Byte
    
    'bufTmp = xmlstream.Read(xmlstream.Size)
    
    Dim xmlhttp
    Set xmlhttp = CreateObject("Msxml2.XMLHTTP")
    Call xmlhttp.open("POST", "http://www.google.com/glm/mmap ", False)
    Call xmlhttp.setRequestHeader("Content-Type", "application/binary")
    Call xmlhttp.setRequestHeader("Content-Length", xmlstream.Size)
    Call xmlhttp.send(xmlstream.Read(xmlstream.Size))
    Dim ps
    ps = xmlhttp.responseBody
    
解释回收的数据

    If 1 = 1 Then
        If ps(0) = 0 And ps(1) = 14 And ps(2) = 27 Then
            Dim ret_code As Long:   ret_code = (ps(3) * 256 * 256 * 256) or (ps(4) * 256 * 256) or (ps(5) * 256) or (ps(6))


            If ret_code = 0 Then
                Dim lat As Double: lat = (((ps(7) * 256 * 256 * 256) or (ps(8) * 256 * 256) or (ps(9) * 256) or (ps(10)))) / 1000000
                Dim lon As Double: lon = (((ps(11) * 256 * 256 * 256) or (ps(12) * 256 * 256) or (ps(13) * 256) or (ps(14)))) / 1000000
                Label1 = lat & "," & lon

显示地图坐标

                WebBrowser1.Navigate "http://maps.google.com/staticmap?center= " & Label1 & "&zoom=15&size=500x500&maptype=mobile"

            End If
        End If
    End If

接着是程序的截图



这个是最简单的测试版,接着就开始做ASP的网络版本咯,启动......