前段时间有个业务需求要在PB程序里上传文件到文件服务器（文件上传服务是个Java Web Service)，由于PB7在调用Web service方面存在很多的弊端，而且极其不好用，所以决定用C#2005写个dll，给PB调用。PB通过调用c# dll实现文件上传。现在问题变成了PB如何调用C#写的dll和C#如何调用Java Web Service，由于C#调用Java Web Service很方便而且资料也很多，所以本文接下去只讨论PB如何调用C#写的dll？
1.C# dll制作
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1） 新建工程，工程类型为“类库”，即工程编译之后能得到dll，假设工程名称为CallForPB,默认的命名空间也为CallForPB；
2） 工程的属性设置，主要有下述2个重要的技术点，如不设置的话，PB无法访问编译之后的dll
a) 在“生成”属性页中把“为Com Interrop注册”选项勾上
b) 在AssemblyInfo.cs程序集信息文件中，设置[assembly: ComVisible(true)]
c) 新建一个类，命名为ServiceProvider,其有个方法uploadFile(string fileName);
d) 至于uploadFile方法如何调用WEB Service上传文件，这里不再细说。
CallForPB.dll文件，编译的时候C# 2005就会为该dll写注册表信息。
2. PB如何调用该dll
1）如果pb程序开发和刚才提到的C#dll开发在同一台机器的话，那么不需要写注册表信息，因为C#2005在编译生成该dll文件的时候已经在注册表中写入com服务注册信息了。如果不是的话，就要导入注册表信息，大概如下：
[HKEY_CLASSES_ROOT/CLSID/{A4C29508-149C-3D3A-B68D-5D5103E79AEF}]
@="CallForPB.ServiceProvider"
[HKEY_CLASSES_ROOT/CLSID/{A4C29508-149C-3D3A-B68D-5D5103E79AEF}/Implemented Categories]
[HKEY_CLASSES_ROOT/CLSID/{A4C29508-149C-3D3A-B68D-5D5103E79AEF}/Implemented Categories/{62C8FE65-4EBB-45e7-B440-6E39B2CDBF29}]
[HKEY_CLASSES_ROOT/CLSID/{A4C29508-149C-3D3A-B68D-5D5103E79AEF}/InprocServer32]
@="mscoree.dll"
"ThreadingModel"="Both"
"Class"="CallForPB.ServiceProvider"
"Assembly"="CallForPB, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
"RuntimeVersion"="v2.0.50727"
"CodeBase"="file:///C:/WINDOWS/system32/CallForPB.dll"
[HKEY_CLASSES_ROOT/CLSID/{A4C29508-149C-3D3A-B68D-5D5103E79AEF}/InprocServer32/1.0.0.0]
"Class"="CallForPB.ServiceProvider"
"Assembly"="CallForPB, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
"RuntimeVersion"="v2.0.50727"
"CodeBase"="file:///C:/WINDOWS/system32/CallForPB.dll"
[HKEY_CLASSES_ROOT/CLSID/{A4C29508-149C-3D3A-B68D-5D5103E79AEF}/ProgId]
@="CallForPB.ServiceProvider"
[HKEY_CLASSES_ROOT/CallForPB.ServiceProvider]
@="CallForPB.ServiceProvider"
[HKEY_CLASSES_ROOT/CallForPB.ServiceProvider/CLSID]
@="{A4C29508-149C-3D3A-B68D-5D5103E79AEF}"大家可以通过在C#dll开发机上搜索注册表信息得到详细注册信息，然后将其导出即可。
2)PB调用dll，假设是w_frame窗体调用
a)申明一个窗体变量：OLEObject callForPB
b)在open事件里，初始化callForPB
int li_return
//
callForPB= create OLEObject
li_return = callForPB.ConnectToNewObject("CallForPB.ServiceProvider")
//初始化失败
if li_return < 0 then
messagebox('load ocx error',li_return)
DESTROY callForPB
close(this)
end ifc)在close时间销毁callForPB
if not isnull(callForPB) then
destroy callForPB
end ifd)调用uploadFile函数
callForPB.uploadFile(文件路径);
