在用#import语句加入Ado15.dll编译时报错WINDOWS.H already included，什么原因 ,急，解决立马结账

[zhangxg001]

warning C4146: unary minus operator applied to unsigned type, result still unsigned
d:\program files\microsoft visual studio\vc98\mfc\include\afxv_w32.h(14) : fatal error C1189: #error : . MFC apps must not #include <windows.h>
Error executing cl.exe.
这是什么意思，怎么解决

[commandconque]

你在所有的include 预处理文件之后加入import 语句试试

[alfred13]

Compiler Warning (level 3) C4146
unary minus operator applied to unsigned type, result still unsigned

The variable should be cast to a signed type if it must contain a signed value. Its type is still unsigned.

The following example causes this warning:

void func()
{
unsigned int ui;
-ui; // warning

[alfred13]

Fatal Error C1189
#error : user supplied error message

This error message is generated when there is an #error directive in the program. For example:

#undef _WIN32

#if !defined(_WIN32)
#error _WIN32 must be defined //error
#endif

int main() {
return 0;
}

[zhangxg001]

如何解决，能讲清楚一点吗，我不是很熟悉这一块

[ZHENG017]

#import "msado15.tlb" ...

[birdzxy]

我怀疑你是在动态连接库里引用的，呵呵不知道是不是啊，不过也随便说一下，如果是的话
去掉#include <afxdao.h>（在STDAFX。H里）

[iketeng]

把你的IMPORT语句放在下面这块之后就OK了！

#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

[try1225]

可能是你在stdafx.h中引入#import 的位置不对，我也碰到过类似的问题，下面是stdafx.h的所有内容,你按这样试一试：

// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//

#if !defined(AFX_STDAFX_H__94AF60A9_BD38_4D19_98DE_F90F0D080E3D__INCLUDED_)
#define AFX_STDAFX_H__94AF60A9_BD38_4D19_98DE_F90F0D080E3D__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的引入位置
#import "C:\Program Files\Common Files\System\ado\msado15.dll" \
no_namespace \
rename("EOF","adoEOF")

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

#endif // !defined(AFX_STDAFX_H__94AF60A9_BD38_4D19_98DE_F90F0D080E3D__INCLUDED_)

[njtu]

#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;

如果你include了windows.h,去掉他看看

[显刚]

应该是重复引用的问题
在StdAfx.h中如果有下面这一段
/*
#ifndef _AFX_NO_DB_SUPPORT
#include <afxdb.h> // MFC ODBC database classes
#endif // _AFX_NO_DB_SUPPORT

#ifndef _AFX_NO_DAO_SUPPORT
#include <afxdao.h> // MFC DAO database classes
#endif // _AFX_NO_DAO_SUPPORT
*/
就注释掉
这样就没问题了

[andyhn]

同意try1225(xyz) ( )
我今天也碰到相同的问题，
确实是位置的问题
照try1225(xyz) ( ) 的做法就解决了

[dreamchild]

放在STDAFX.H文件的最后边就没问题了。
不要放在stdafx.h原有语句的前边。因为编译是按顺序的。

[fengge8ylf]

up

[bluebohe]

楼主问题应该解决掉了吧