__declspec(dllexport)
这一段时间要用到dll中使用ado,在mfc中用ado一段时间没有出现什么问题,本以为在dll中也不会出现什么问题,但是问题产生了,而且是在最开始的导入ado的dll文件时候。我的做法是:
#import "c:/program files/common files/system/ado/msado15.dll" no_namespace rename("EOF","adoEOF")
出现:
Compiling resources...
Compiling...
StdAfx.cpp
F:/source/vc/Query/debug/msado15.tlh(169) : error C2011: 'LockTypeEnum' : 'enum' type redefinition
F:/source/vc/Query/debug/msado15.tlh(212) : error C2011: 'DataTypeEnum' : 'enum' type redefinition
F:/source/vc/Query/debug/msado15.tlh(256) : error C2011: 'FieldAttributeEnum' : 'enum' type redefinition
F:/source/vc/Query/debug/msado15.tlh(277) : error C2011: 'EditModeEnum' : 'enum' type redefinition
F:/source/vc/Query/debug/msado15.tlh(285) : error C2011: 'RecordStatusEnum' : 'enum' type redefinition
F:/source/vc/Query/debug/msado15.tlh(405) : warning C4146: unary minus operator applied to unsigned type, result still unsigned
F:/source/vc/Query/debug/msado15.tlh(527) : error C2011: 'ParameterDirectionEnum' : 'enum' type redefinition
Error executing cl.exe.
ADIDllTest.dll - 6 error(s), 1 warning(s)
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")