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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