C# 调用第三方DLL完整实例

C# 调用第三方DLL完整实例

分类： C/C++

以下代码为本人在实际项目中编写的调用第三方DLL接口程序的完整代码。

public class ExecuteDLL : Form

{

   ...//忽略与调用DLL无关的代码

   private IntPtr hModule = IntPtr.Zero;

   /// <summary>

   /// 调用HIS系统提供的DLL接口程序查看检查申请单

   ///DLL的名称：H62AppQueryToPacs.dll

   ///函数名说明：

   ///function THandle HLoginProc(THandlea AppHandle, THandle aCallWinHandle,THandle aPluginHandle

   ///                            PChar aBqno,PChar aEmpno,PChar aPatno);

   ///传入变量参数说明：

   /////    aAppHandle: THandle; //应用程序句柄

   /////    aCallWinHandle: THandle; //调用窗口句柄

   /////    aPluginHandle: THandle; // 插件的句柄

   /////    aEmpno,PChar;//医生工号

   /////    aBqno: PChar;//病区代码

   /////    aPatno: PChar;//病人记账号

   /// </summary>

   /// <param name="lpFileName"></param>

   /// <returns></returns> 

   //申明外部API

   [DllImport("kernel32.dll")]

   static extern IntPtr LoadLibrary(string lpFileName);

   [DllImport("kernel32.dll")]

   static extern IntPtr GetProcAddress(IntPtr hModule, string lpProcName);

   [DllImport("kernel32", EntryPoint = "FreeLibrary", SetLastError = true)]

   static extern bool FreeLibrary(IntPtr hModule);

   //申明委托

   private delegate IntPtr HLoginProc(IntPtr aAppHandle,  IntPtr aCallWinHandle,  IntPtr aPluginHandle,

         string aBqno, string aEmpno,  string aPatno);

   //获取函数地址

   private Delegate GetFunctionAddress(IntPtr dllModule, string functionName, Type t)

   {

       IntPtr address = GetProcAddress(dllModule, functionName);

       if (address == IntPtr.Zero)

           return null;

       else

           return Marshal.GetDelegateForFunctionPointer(address, t);

   }

   //按钮单击事件

   private void button_CheckList_Click(object sender, EventArgs e)

   {

       try

       {

           SIS_Model.MWorkList smWorkList;

           PACS_Model.MWorkList pmWorkList;

           string strNo = "";

           switch (GetConfig.DALAndModel)

           {

               case "SIS":

                   smWorkList = (SIS_Model.MWorkList)this.iWorkList;

                   strNo = (smWorkList.INPATIENTNO == null ? "" : smWorkList.INPATIENTNO.ToString());// 病人记账号 "875624";

                   break;

               case "PACS":

                   pmWorkList = (PACS_Model.MWorkList)this.iWorkList;

                   strNo = (pmWorkList.INPATIENTNO == null ? "" : pmWorkList.INPATIENTNO.ToString());// 病人记账号 "875624";

                   break;

           }

           if (strNo.Trim() == "")

           {

               MessageBox.Show("无法获取患者ID，请确认操作步骤是否正确");

               return;

           }

           //加载DLL

           try

           {

               string strDLLPath = Environment.CurrentDirectory + "\HuiTong\JianChaShenQingDan\H62AppQueryToPacs.dll";

               hModule = LoadLibrary(strDLLPath);

               if (hModule.Equals(IntPtr.Zero))

               {

                   MessageBox.Show("导入DLL失败");

                   return;

               }

           }

           catch (Exception ex)

           {

               MessageBox.Show(ex.Message.ToString());

               FreeLibrary(hModule);

               hModule = IntPtr.Zero;

               return;

           }

           //将要调用的方法转换为委托：hModule为DLL的句柄，"HLoginProc"为DLL中方法的名称

           HLoginProc farProc = (HLoginProc)this.GetFunctionAddress(hModule, "HLoginProc", typeof(HLoginProc));

           if (farProc == null)

           {

               FreeLibrary(hModule);

               hModule = IntPtr.Zero;

               return;

           }

           //利用委托执行DLL文件中的接口方法

           farProc(hModule, IntPtr.Zero, IntPtr.Zero, null, null, strNo);

           FreeLibrary(hModule);

           hModule = IntPtr.Zero;

       }

       catch (Exception ex)

       {

           MessageBox.Show(ex.Message.ToString());

           FreeLibrary(hModule);

           hModule = IntPtr.Zero;

           return;

       }

   }

}

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