MFC动态库里封装对话框界面（Dialog）

比眉伴天荒 2022-12-28 09:00 309阅读 0赞

在MFC动态库里封装弹窗，首先需要MFC创建动态库时选择“MFC Extension DLL”：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70]  
创建好以后，新建一个对话框，并为对话框创建一个类与之绑定，而后对对话框的各种编码方式同MFC应用程序，在完成弹窗逻辑后，记得给头文件里class和类名之间增加一个\_\_declspec(dllexport)将类导出，编译即可。但这种用法因为另一个应用程序使用时必须包含对话框的头文件，导致应用程序同时包含了应用程序自己使用的resource.h和动态库使用的resource.h，那么在定义资源名称时，尽量不要重复了，不过我试过了，即使重复了，也不过编译时会有警告，但仍然可以编译通过并运行成功，比如我贴出的实例代码里，IDD\_LOGIN就是我故意修改的冲突的宏定义。  
首先贴出动态库的各个文件：  
动态库的resource.h:

//{ {NO_DEPENDENCIES}}
    // Microsoft Developer Studio generated include file.
    // Used by dlgdll.rc
    //
    #define IDD_LOGIN 3000
    #define IDC_UNAME 3000
    #define IDC_UPASS 3001
    
    // Next default values for new objects
    // 
    #ifdef APSTUDIO_INVOKED
    #ifndef APSTUDIO_READONLY_SYMBOLS
    #define _APS_NEXT_RESOURCE_VALUE 3001
    #define _APS_NEXT_COMMAND_VALUE 32771
    #define _APS_NEXT_CONTROL_VALUE 3002
    #define _APS_NEXT_SYMED_VALUE 3000
    #endif
    #endif

动态库的Login.h

#if !defined(AFX_LOGIN_H__E89E0B64_27D5_4647_9BFF_DBEFF5152794__INCLUDED_)
    #define AFX_LOGIN_H__E89E0B64_27D5_4647_9BFF_DBEFF5152794__INCLUDED_
    
    #if _MSC_VER > 1000
    #pragma once
    #endif // _MSC_VER > 1000
    
    #include "resource.h"
    
    /
    // CLogin dialog
    
    class __declspec(dllexport) CLogin : public CDialog
    { 
    // Construction
    public:
    	CLogin(CWnd* pParent = NULL);   // standard constructor
    
    // Dialog Data
    	//{ {AFX_DATA(CLogin)
    	enum {  IDD = IDD_LOGIN };
    		// NOTE: the ClassWizard will add data members here
    	//}}AFX_DATA
    
    
    // Overrides
    	// ClassWizard generated virtual function overrides
    	//{ {AFX_VIRTUAL(CLogin)
    	protected:
    	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
    	//}}AFX_VIRTUAL
    
    // Implementation
    protected:
    
    	// Generated message map functions
    	//{ {AFX_MSG(CLogin)
    	virtual void OnOK();
    	//}}AFX_MSG
    	DECLARE_MESSAGE_MAP()
    
    public:
    	CString GetUserName() { return m_username;}
    	CString GetPassword() { return m_password;}
    
    private:
    	CString m_username;
    	CString m_password;
    };
    
    //{ {AFX_INSERT_LOCATION}}
    // Microsoft Visual C++ will insert additional declarations immediately before the previous line.
    
    #endif // !defined(AFX_LOGIN_H__E89E0B64_27D5_4647_9BFF_DBEFF5152794__INCLUDED_)

动态库的Login.cpp，输入用户名和密码，点击确定按钮，弹窗消失之前，将用户名、密码存入对象的私有成员变量中。

// Login.cpp : implementation file
    //
    
    #include "stdafx.h"
    #include "Login.h"
    
    #ifdef _DEBUG
    #define new DEBUG_NEW
    #undef THIS_FILE
    static char THIS_FILE[] = __FILE__;
    #endif
    
    /
    // CLogin dialog
    
    
    CLogin::CLogin(CWnd* pParent /*=NULL*/)
    	: CDialog(CLogin::IDD, pParent)
    { 
    	//{ {AFX_DATA_INIT(CLogin)
    		// NOTE: the ClassWizard will add member initialization here
    	//}}AFX_DATA_INIT
    }
    
    
    void CLogin::DoDataExchange(CDataExchange* pDX)
    { 
    	CDialog::DoDataExchange(pDX);
    	//{ {AFX_DATA_MAP(CLogin)
    		// NOTE: the ClassWizard will add DDX and DDV calls here
    	//}}AFX_DATA_MAP
    }
    
    
    BEGIN_MESSAGE_MAP(CLogin, CDialog)
    	//{ {AFX_MSG_MAP(CLogin)
    	//}}AFX_MSG_MAP
    END_MESSAGE_MAP()
    
    /
    // CLogin message handlers
    
    void CLogin::OnOK() 
    { 
    	CString username, password;
    	GetDlgItemText(IDC_UNAME, username);
    	GetDlgItemText(IDC_UPASS, password);
    	if (username.IsEmpty()) { 
    		MessageBox("请输入用户名");
    		return;
    	}
    	if (password.IsEmpty()) { 
    		MessageBox("请输入密码");
    		return;
    	}
    	m_username = username;
    	m_password = password;
    
    	CDialog::OnOK();
    }

动态库对话框:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70 1]

下面是MFC应用程序调用DLL方法：  
首先在弹窗应用的对话框里增加一个登陆按钮：  
![在这里插入图片描述][20201216090817727.png]  
在StdAfx.h头文件里增加引入头文件和动态库：

#include "../dlgdll/Login.h"
    #ifdef _DEBUG
    #pragma comment(lib, "../dlgdll/Debug/dlgdll.lib")
    #else
    #pragma comment(lib, "../dlgdll/Release/dlgdll.lib")
    #endif

双击登陆按钮，编写响应函数：调用对话框，如果用户按了确定按钮并且弹窗消失了，那么可以从对象里取出用户名、密码。

void CTestdllDlg::OnLogin() 
    { 
    	CLogin dlg;
    	int result = dlg.DoModal();
    	if (result == IDOK) { 
    		MessageBox("用户名：" + dlg.GetUserName() + " 密码:" + dlg.GetPassword());
    	}
    	
    }

使用效果：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70 5]  
编译日志：

> \--------------------Configuration: testdll - Win32 Debug--------------------  
> Compiling resources…  
> Compiling…  
> StdAfx.cpp  
> Compiling…  
> testdll.cpp  
> d:\\vscode\\testdll\\resource.h(9) : warning C4005: ‘IDD\_LOGIN’ : macro redefinition  
> d:\\vscode\\dlgdll\\resource.h(5) : see previous definition of ‘IDD\_LOGIN’  
> testdllDlg.cpp  
> d:\\vscode\\testdll\\resource.h(9) : warning C4005: ‘IDD\_LOGIN’ : macro redefinition  
> d:\\vscode\\dlgdll\\resource.h(5) : see previous definition of ‘IDD\_LOGIN’  
> Generating Code…  
> Linking…  
> Creating library Debug/testdll.lib and object Debug/testdll.exp  
> testdll.exe - 0 error(s), 2 warning(s)

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70]: /images/20221120/aefd7dcc49de4d9c855982812890a15f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20201216090732577.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5,size_16,color_FFFFFF,t_70
[20201216090817727.png]: https://img-blog.csdnimg.cn/20201216090817727.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20201216091247431.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20201216091256512.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20201216091305390.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20201216091314996.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nhbmx5bmV0c2t5,size_16,color_FFFFFF,t_70