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,@H_301_1@

为此我也分享我应用的一些喜悦。@H_301_1@

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。@H_301_1@

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言归正转，
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需求分析：@H_301_1@

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
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2.目前有一台 web 服务器为apache + PHP 或 python
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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）@H_301_1@

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解决方案：@H_301_1@

（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）@H_301_1@

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，@H_301_1@

现在你应该可以在服务器上执行：http://localhost/xmlrpc/debugger/index.PHP，@H_301_1@

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。
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（二）python 为后台web服务语言的解决方案：
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python 本身就支持 xml-rpc的，在这里我写一个简单的服务器例子：@H_301_1@

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@H_301_1@

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（三）现在讲客户端 vb6 如何联接 web服务器@H_301_1@

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）
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http://www.enappsys.com/backend/vbXMLRPC/vbXMLRPCBinaries.jsp@H_301_1@

2.) 接着注册COM
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regsvr32 /s vbXML.dll
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regsvr32 /s vbXMLRPC.dll@H_301_1@

3.) 在vb6中引用，如下图@H_301_1@

4.）vb6 客户端代码如何写，如下图@H_301_1@

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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如何用vb6.0采用xml-rpc联接访问后台web

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