error C2871: “ADODB”: 具有该名称的命名空间不存在（error C2871: “ADODB”: 具有该名称的命名空间不存在）

小咪咪 2022-08-05 14:16 94阅读 0赞

**1.WINDOWS.H already included. MFC apps must not \#include <windows.h>**

I just added the \#import "C:\\Program Files\\Common Files\\System\\ado\\msado15.dll" no\_namespace rename("EOF","ADOEOF")

in the <StdAfx.h> file. When the import sentence was add in the head of file,the error occured. But when I moved it to the tail of the file,Everything was OK. I don't know why.

// stdafx.h : include file for standard system include files,

// or project specific include files that are used frequently, but

//are changed infrequently

//\#import "C:\\Program Files\\Common Files\\System\\ado\\msado15.dll" no\_namespace rename("EOF","adoEOF")  error

\#if !defined(AFX\_STDAFX\_H\_\_C914C8D4\_56EB\_44CD\_AE77\_600C6D941BA2\_\_INCLUDED\_)

\#define AFX\_STDAFX\_H\_\_C914C8D4\_56EB\_44CD\_AE77\_600C6D941BA2\_\_INCLUDED\_

\#if \_MSC\_VER > 1000

\#pragma once

\#endif // \_MSC\_VER > 1000

\#define VC\_EXTRALEAN // Exclude rarely-used stuff from Windows headers

\#include <afxwin.h>// MFC core and standard components

\#include <afxext.h>// MFC extensions

\#include <afxdisp.h>// MFC Automation classes

\#include <afxdtctl.h> // MFC support for Internet Explorer 4 Common Controls

\#ifndef \_AFX\_NO\_AFXCMN\_SUPPORT

\#include <afxcmn.h> // MFC support for Windows Common Controls

\#endif // \_AFX\_NO\_AFXCMN\_SUPPORT

\#import "C:\\Program Files\\Common Files\\System\\ado\\msado15.dll" no\_namespace rename("EOF","ADOEOF") is OK

//\{ \{AFX\_INSERT\_LOCATION\}\}

// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

\#endif // !defined(AFX\_STDAFX\_H\_\_C914C8D4\_56EB\_44CD\_AE77\_600C6D941BA2\_\_INCLUDED\_)

**2error C2011: 'DataTypeEnum' : 'enum' type redefinition解决方法**

2009-06-26 17:36

<table style="margin:0px; padding:0px; color:rgb(32,40,32); font-family:simsun; font-size:14px; background-color:rgb(149,195,239); table-layout:fixed; width:690px"> 
 <tbody> 
 <tr> 
 <td style="margin:0px; padding:0px; font-family:Verdana,宋体,sans-serif; line-height:18px"> 1&gt;------ 已启动生成: 项目: iotser, 配置: Debug Win32 ------ 1&gt;正在编译... 1&gt;iotser.cpp 1&gt;f:\c++ pro\iocptser\debug\msado15.tlh(228) : error C2011: “LockTypeEnum”: “enum”类型重定义 1&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c:\program files\microsoft sdks\windows\v6.0a\include\dbdaoint.h(109) : 参见“LockTypeEnum”的声明 1&gt;f:\c++ pro\iocptser\debug\msado15.tlh(276) : error C2011: “DataTypeEnum”: “enum”类型重定义 1&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c:\program files\microsoft sdks\windows\v6.0a\include\dbdaoint.h(138) : 参见“DataTypeEnum”的声明 1&gt;f:\c++ pro\iocptser\debug\msado15.tlh(321) : error C2011: “FieldAttributeEnum”: “enum”类型重定义 1&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c:\program files\microsoft sdks\windows\v6.0a\include\dbdaoint.h(127) : 参见“FieldAttributeEnum”的声明 1&gt;f:\c++ pro\iocptser\debug\msado15.tlh(343) : error C2011: “EditModeEnum”: “enum”类型重定义 1&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c:\program files\microsoft sdks\windows\v6.0a\include\dbdaoint.h(83) : 参见“EditModeEnum”的声明 1&gt;f:\c++ pro\iocptser\debug\msado15.tlh(352) : error C2011: “RecordStatusEnum”: “enum”类型重定义 1&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c:\program files\microsoft sdks\windows\v6.0a\include\dbdaoint.h(341) : 参见“RecordStatusEnum”的声明 1&gt;f:\c++ pro\iocptser\debug\msado15.tlh(616) : error C2011: “ParameterDirectionEnum”: “enum”类型重定义 1&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c:\program files\microsoft sdks\windows\v6.0a\include\dbdaoint.h(326) : 参见“ParameterDirectionEnum”的声明 1&gt;f:\c++ pro\iocptser\iocptser.cpp(18) : error C2871: “ADODB”: 具有该名称的命名空间不存在 1&gt;生成日志保存在“file://f:\C++ pro\iocptser\Debug\BuildLog.htm” 1&gt;iocptser - 7 个错误，0 个警告 ========== 生成: 成功 0 个，失败 1 个，最新 0 个，跳过 0 个 ========== 后来经过在csdn上的搜索发现有下面两种办法来解决这个问题 1） #pragma warning(disable:4146) #import "C:\Program Files\Common Files\System\ADO\msado15.dll" named_guids rename("EOF","adoEOF"), rename("BOF","adoBOF") #pragma warning(default:4146) using namespace ADODB; 2） #pragma warning(disable:4146) #import "C:\Program Files\Common Files\System\ado\msado15.dll" \ no_namespace \ rename("EOF","adoEOF") rename("DataTypeEnum","adoDataTypeEnum") \ rename("FieldAttributeEnum", "adoFielAttributeEnum") rename("EditModeEnum", "adoEditModeEnum") \ rename("LockTypeEnum", "adoLockTypeEnum") rename("RecordStatusEnum", "adoRecordStatusEnum") \ rename("ParameterDirectionEnum", "adoParameterDirectionEnum") </td> 
 </tr> 
 </tbody> 
</table>