从c＃调用C ++ dll函数

问题描述

我有一个解决方案，具有一个带有函数的c ++ dll项目（MsgHook.cpp）： -

  BOOL f_closeSEB ）
 {
 logg（fp，\\\
\\\
）; 
 // TerminateProcess（hPiProcess-> hProcess，0）; 
 SendMessage（hWndCaller，WM_DESTROY，NULL，NULL）; 
 logg（fp，SEB exit sequence，destroy window\\\
）; 
 // logg（fp，Leave LLKeyboardHook（）并返回-1\\\
\\\
）; 
 return -1; 
} 
  

我正在尝试从我的c＃web services项目中调用此函数方式： -

 使用System.Runtime.InteropServices; 
 
命名空间closeSEB 
 {
 partial class closeSEBService 
 {
 ///< summary> 
 ///必需的设计器变量。 
 ///< / summary> 
 private System.ComponentModel.IContainer components = null; 
 
 public枚举命令
 {
 CloseIt = 255 
} 
 
 ///< summary> 
 ///清理正在使用的资源。 
 ///< / summary> 
 ///< param name =disposal>如果管理资源应该处理，则为true;否则为false。< / param> 
 protected override void Dispose（bool disposal）
 {
 if（disposal&&（components！= null））
 {
 components.Dispose（）; 
} 
 base.Dispose（处置）; 
} 
 
 [DllImport（MsgHook.dll，SetLastError = true）] 
 public static extern void runRTS（string serviceName）; 
 
 protected override void OnCustomCommand（int command）
 {
 base.OnCustomCommand（command）; 
 if（command ==（int）commands.CloseIt）
 {
 //代码调用msghook closeSEB函数
 runRTS（closeSEBService）; 
 f_closeSEB（）; 
} 
} 
 #region组件设计器生成代码
 
 ///< summary> 
 /// Designer支持的必需方法 - 不要使用代码编辑器修改
 ///该方法的内容。 
 ///< / summary> 
 private void InitializeComponent（）
 {
 // 
 // closeSEBService 
 // 
 this.ServiceName =Service1; 
 
} 
 
 #endregion 
 
} 
} 
  

但在编译器中，我收到一个错误，名称f_closeSEB不会在当前上下文中退出。这是不是通过C＃调用DLL文件中定义的函数的正确方法？

解决方案

你必须确保两件事：

1. 正确编写DLLImport，如下例所示

   
   
   

   [DllImport（MsgHook.dll，SetLastError = true）]
   public static extern bool f_closeSEB（）;




2. 确保编译根据C＃程序需要的DLLMsgHook.dll用于x86或x64。 .NET支持任何cpu ，但是C ++没有，所以请确保所需的类型。

了解更多信息，请考虑关于。

I have a solution that has a c++ dll project(MsgHook.cpp) with a function:-

BOOL f_closeSEB()
{
    logg(fp, "\n\n");
    //TerminateProcess(hPiProcess->hProcess,0);
    SendMessage(hWndCaller,WM_DESTROY,NULL,NULL);
    logg(fp, "   SEB exit sequence, destroy window\n");
    //logg(fp, "Leave LLKeyboardHook() and return -1\n\n");
    return -1;
}

I am trying to call this function from my c# web services project in the following way:-

using System.Runtime.InteropServices;

    namespace closeSEB
    {
        partial class closeSEBService
        {
            /// <summary>
            /// Required designer variable.
            /// </summary>
            private System.ComponentModel.IContainer components = null;

            public enum commands
            {
                CloseIt=255
            }

            /// <summary>
            /// Clean up any resources being used.
            /// </summary>
            /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
            protected override void Dispose(bool disposing)
            {
                if (disposing && (components != null))
                {
                    components.Dispose();
                }
                base.Dispose(disposing);
            }

            [DllImport("MsgHook.dll", SetLastError = true)]
            public static extern void runRTS(string serviceName);

             protected override void OnCustomCommand(int command)
            {
              base.OnCustomCommand(command);
              if (command == (int)commands.CloseIt)
              {
                //Code to call msghook closeSEB function
                  runRTS("closeSEBService");
                  f_closeSEB();
              }
            }
            #region Component Designer generated code

            /// <summary>
            /// Required method for Designer support - do not modify
            /// the contents of this method with the code editor.
            /// </summary>
            private void InitializeComponent()
            {
                //
                // closeSEBService
                //
                this.ServiceName = "Service1";

            }

            #endregion

        }
    }

But in the compiler, I am getting an error that the name f_closeSEB does not exit in current context. Is this not the correct way of calling the function defined in DLL file via C#?

解决方案

You have to make sure of two things:

1. Write the DLLImport correctly like in the examples shown below

   [DllImport("MsgHook.dll", SetLastError = true)]public static extern bool f_closeSEB();

2. Make sure you compile the DLL "MsgHook.dll" for x86 or x64 according to the C# program needs. .NET supports any cpu but C++ does not, so make sure of the required type.

for more information, please consider the MSDN article on Calling Win32 DLLs in C# with P/Invoke.

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