Error C2871: "ADODB": The namespace with this name does not exist (error C2871: "ADODB": The namespace with this name does not exist), c2871 namespace

Error C2871: "ADODB": The namespace with this name does not exist (error C2871: "ADODB": The namespace with this name does not exist), c2871 namespace

1. WINDOWS. H already supported ded. MFC apps must not # include <windows. h>

I just added# 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,

//Are changed infrequently

//

// # Import "C: \ Program Files \ Common Files \ System \ ado \ msado15.dll" no_namespace rename ("EOF", "adoEOF ")//// Error

# If! Defined (afx_stdafx_h1_c914c8d4_56eb_44cd_ae77_600c6d941ba21_included _)

# Define afx_stdafx_h1_c914c8d4_56eb_44cd_ae77_600c6d941ba21_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_h1_c914c8d4_56eb_44cd_ae77_600c6d941ba21_included _)

    2 error C2011: 'peypeenum': 'enum' type redefinition Solution

1> ------ generated: Project: iotser, configuration: Debug Win32 ------ 1> compiling... 1> iotser. cpp 1> f: \ c ++ pro \ iocptser \ debug \ msado15.tlh (228): error C2011: "LockTypeEnum": "enum" type redefinition 1>      C: \ program files \ microsoft sdks \ windows \ v6.0a \ include \ dbdaoint. h (109): see the "LockTypeEnum" statement. 1> f: \ c ++ pro \ iocptser \ debug \ msado15.tlh (276): error C2011: "DataTypeEnum": "enum" type redefinition 1>      C: \ program files \ microsoft sdks \ windows \ v6.0a \ include \ dbdaoint. h (138): See the DataTypeEnum statement. 1> f: \ c ++ pro \ iocptser \ debug \ msado15.tlh (321): error C2011: "FieldAttributeEnum": "enum" type redefinition 1>      C: \ program files \ microsoft sdks \ windows \ v6.0a \ include \ dbdaoint. h (127): see the "FieldAttributeEnum" Statement 1> f: \ c ++ pro \ iocptser \ debug \ msado15.tlh (343): error C2011: "EditModeEnum": "enum" type redefinition 1>      C: \ program files \ microsoft sdks \ windows \ v6.0a \ include \ dbdaoint. h (83): see the "EditModeEnum" statement. 1> f: \ c ++ pro \ iocptser \ debug \ msado15.tlh (352): error C2011: "RecordStatusEnum": "enum" type redefinition 1>      C: \ program files \ microsoft sdks \ windows \ v6.0a \ include \ dbdaoint. h (341): see the "RecordStatusEnum" Statement 1> f: \ c ++ pro \ iocptser \ debug \ msado15.tlh (616): error C2011: "parameterdireoneonenum": "enum" type redefinition 1>      C: \ program files \ microsoft sdks \ windows \ v6.0a \ include \ dbdaoint. h (326): see the "ParameterDirectionEnum" statement. 1> f: \ c ++ pro \ iocptser. cpp (18): error C2871: "ADODB": The namespace with this name does not exist 1> the generated logs are stored in "file: // f: \ C ++ pro \ iocptser \ Debug \ BuildLog.htm" 1> iocptser-7 errors and 0 warnings ============ Generate: 0 successful, 1 failed, 0 latest, skipped 0 ========== After searching on csdn, we found the following two solutions to solve this problem: 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", "adoparameterdireenuM ")