如何用vb6.0采用xml-rpc联接访问后台web

有两年都没有搞vb6了,转做 php 和 python ,但一直很怀念那段时光,无法割舍他的简单与实用,由于项目关系,时常也会用上vb6,

为此我也分享我应用的一些喜悦。

 xml-rpc(什么叫xml-rpc,在这里我就不作过多的专业说明,大家可以 baidu一下) 其实也是满有用的,也是简单、实用,在一些小项目上可以做出很优越的表现,vb6结合xml-rpc与后台web服务器联结,真的可以说是太完美了,刚好可以结合我现在的项目。


言归正转,

需求分析:

1.客户端之前是用vb6写的,现在需要访问外部网络数据(比如获取实时外汇汇率,等等),但是又不想开放外网访问权限给你的客户端

2.目前有一台 web 服务器为apache + php 或 python

3.因为之前vb6写的程序不想一下全部转为 网页(因为这是个大工程)


解决方案:

(一) php 为后台web服务语言的解决方案:(服务器安装,这里就不讲了)

先下载 XML-RPC for PHP ,解压后放到你的服务器网页根目录下,用于后台 xml-rpc 服务,

现在你应该可以在服务器上执行:http://localhost/xmlrpc/debugger/index.php

Address: localhost , Path: /xmlrpc/demo/server/server.php, 选择 list available methods, 点 execute 后,应该可以看到如下图结果,则说明你xml-rpc 服务可以使用。


(二)python 为后台web服务语言的解决方案:

python 本身就支持 xml-rpc的,在这里我写一个简单的服务器例子:

from xmlrpc.server import SimpleXMLRPCServer
from xmlrpc.server import SimpleXMLRPCRequestHandler

# Restrict to a particular path.
class RequestHandler(SimpleXMLRPCRequestHandler):
    rpc_paths = ('/RPC2',)

# Create server
server = SimpleXMLRPCServer(("localhost", 8000),
                            requestHandler=RequestHandler)
server.register_introspection_functions()

# Register pow() function; this will use the value of
# pow.__name__ as the name, which is just 'pow'.
server.register_function(pow)

# Register a function under a different name
def adder_function(x,y):
    return x + y
server.register_function(adder_function, 'add')

# Register an instance; all the methods of the instance are
# published as XML-RPC methods (in this case, just 'mul').
class MyFuncs:
    def mul(self, x, y):
        return x * y

server.register_instance(MyFuncs())

# Run the server's main loop
server.serve_forever()

保存为rpc.py文件在服务端,双击执行ok


(三) 现在讲 客户端 vb6 如何联接 web服务器

1.)先下载 两个dll:  vbXML.dll , vbXMLRPC.dll ,分别为 xml-rpc 解析工具库,在这里有下载(还提供原代码哦)

http://www.enappsys.com/backend/vbXMLRPC/vbXMLRPCBinaries.jsp

2.) 接着注册COM

regsvr32 /s vbXML.dll

regsvr32 /s vbXMLRPC.dll

3.) 在vb6中引用,如下图

4.)vb6 客户端代码如何写,如下图

Option Explicit

Private Sub Command_Click()
    Dim vRequest   As New XMLRPCRequest
    Dim vResponse  As XMLRPCResponse
    Dim vUtility   As New XMLRPCUtility
    
    Me.MousePointer = vbHourglass
    
       
    Set vRequest = GetPYRpc("add")
    vRequest.Params.AddInteger Text1.Text
    vRequest.Params.AddInteger Text2.Text

    'Debug.Print vRequest.XMLToSend
    Set vResponse = vRequest.Submit
    
    Select Case vResponse.Status
    Case XMLRPC_PARAMSRETURNED
        
        If vResponse.Params.Count = 1 Then
           Debug.Print vResponse.HTTPHeaders
           Debug.Print vResponse.XMLResponse
           Text3.Text = vResponse.Params(1).IntegerValue

        Else
            BugOut "Expecting one return parameter, received '" & vResponse.Params.Count & "'."
        End If
    Case XMLRPC_FAULTRETURNED
        BugOut "Server returned a fault. Code is '" & vResponse.Fault.FaultCode & "', description is '" & vResponse.Fault.FaultString & "'."
    Case XMLRPC_HTTPERROR
        BugOut "HTTP error encountered. Code is '" & vResponse.HTTPStatusCode & "', description is '" & vUtility.GetHTTPError(vResponse.HTTPStatusCode) & "'."
    Case XMLRPC_XMLPARSERERROR
        BugOut "XML Parsing Error encountered '" & vResponse.XMLParseError & "'."
    Case XMLRPC_NOTINITIALISED
        BugOut "Weird, the response claims not to be initialised !!!"
    Case Else
        BugOut "Double Weird, unknown response status '" & vResponse.Status & "'."
    End Select
    
    Me.MousePointer = vbDefault
End Sub

Private Sub BugOut(ByVal vstrError As String)
    MsgBox vstrError, vbOKOnly + vbCritical, App.Title
End Sub


Option Explicit

Public Function GetPHPRpc(ByVal vMethod As String) As XMLRPCRequest
Dim mReq As XMLRPCRequest
Set mReq = New XMLRPCRequest
    mReq.ConnectTimeOut = 60
    mReq.ReceiveTimeOut = 60
    mReq.SendTimeOut = 60
    mReq.HostName = "localhost"
    mReq.HostPort = 80
    mReq.HostURI = "/xmlrpc/demo/server/server.php"
    mReq.MethodName = vMethod
Set GetPHPRpc = mReq
End Function



Public Function GetPYRpc(ByVal vMethod As String) As XMLRPCRequest
Dim mReq As XMLRPCRequest
Set mReq = New XMLRPCRequest
    mReq.ConnectTimeOut = 0
    mReq.ReceiveTimeOut = 0
    mReq.SendTimeOut = 120
    mReq.HostName = "localhost"
    mReq.HostPort = 8000
    mReq.HostURI = "/RPC2"
    mReq.MethodName = vMethod
Set GetPYRpc = mReq
End Function


测试结果如下图:



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