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DLL问题？“DLL 调用约定错误”提示。

楼主public（九天十地菩萨摇头怕怕，霹雳金光雷电掌@!@）2001-12-23 18:55:07 在 VB / 基础类提问

函数原型：

BOOL _declspec(dllimport) SQLSCMLocalServiceStateW(LPWSTR lpszSvc,LPDWORD pdwErr);

vb：
public declare function SQLSCMLocalServiceState lib“....\w95scm.dll”
alias ) SQLSCMLocalServiceStateW(byval lpszsev as string, byval pdwerr as
long ) as bolean

error：？“DLL 调用约定错误” 问题点数：58、回复次数：14Top

1 楼NightBreak（菜鸟2004）回复于 2001-12-23 18:59:09 得分 0

alias括号去掉，如果要使用别名，就随便去一个不会冲突的别名，不用的话，去掉ALIAS；

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2 楼Ranma_True（乱马1/2(真)）回复于 2001-12-23 20:19:52 得分 0

同意楼顶的Top

3 楼public（九天十地菩萨摇头怕怕，霹雳金光雷电掌@!@）回复于 2001-12-24 08:57:29 得分 0

to every friend

括号是我不小心写上的，我在vb中写的是

在vb中：
public declare function SQLSCMLocalServiceState lib“....\w95scm.dll”
alias SQLSCMLocalServiceStateW(byval lpszsev as string, byval pdwerr as
long ) as bolean
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4 楼public（九天十地菩萨摇头怕怕，霹雳金光雷电掌@!@）回复于 2001-12-24 09:10:16 得分 0

to every friend

括号是我不小心写上的，我在vb中写的是

在vb中：
public declare function SQLSCMLocalServiceState lib“....\w95scm.dll”
alias "SQLSCMLocalServiceStateW"(byval lpszsev as string, byval pdwerr as
long ) as bolean
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5 楼dbcontrols（泰山__抛砖引玉）回复于 2001-12-24 09:23:55 得分 0

“换成",注意中英文的引号差别,as bolean是不是应该是as long?Top

6 楼public（九天十地菩萨摇头怕怕，霹雳金光雷电掌@!@）回复于 2001-12-24 09:39:32 得分 0

我的代码：
Public Declare Function SQLSCMLocalServiceState Lib "E:\zzz\w95scm.dll" _
Alias "SQLSCMGetLocalServiceStateA" (ByVal lpszsev As String, ByVal pdwerr As Long) As Long
仍然：error :run-time error '49',bad DLL calling convetionTop

7 楼kingfish（工作很忙,很少来csdn...）回复于 2001-12-25 09:30:17 得分 0

帮你UPTop

8 楼fraser01（王晓栋）回复于 2001-12-25 09:39:47 得分 0

你把C++开头声明部分贴出来看看Top

9 楼public（九天十地菩萨摇头怕怕，霹雳金光雷电掌@!@）回复于 2001-12-25 10:19:24 得分 0

/***********************************************************************
Copyright (c) 2000, Microsoft Corporation
All Rights Reserved.
***********************************************************************/

#ifndef _WN95SCMH_
#define _WN95SCMH_

#ifdef __cplusplus
extern "C"{
#endif

// Numeric constants
#define SERVICE_UNKNOWN 0
enum enumSQLSCMCommands {SQLSCMCmd_STOP,
SQLSCMCmd_PAUSE,
SQLSCMCmd_START,
SQLSCMCmd_CONTINUE};

// Function prototypes
BOOL _declspec(dllimport) SQLSCMLocalServiceControlA(LPSTR lpszSvc,int iCommand,LPDWORD pdwErr,int iCount,void *lpStartParameter);
BOOL _declspec(dllimport) SQLSCMLocalServiceControlW(LPWSTR lpszSvc,int iCommand,LPDWORD pdwErr,int iCount,void *lpStartParameter);
DWORD _declspec(dllimport) SQLSCMGetLocalServiceStateA(LPSTR lpszSvc,LPDWORD pdwErr);
DWORD _declspec(dllimport) SQLSCMGetLocalServiceStateW(LPWSTR pwszSvc,LPDWORD pdwErr);

#ifdef UNICODE
#define SQLSCMLocalServiceControl SQLSCMLocalServiceControlW
#define SQLSCMGetLocalServiceState SQLSCMGetLocalServiceStateW
#else
#define SQLSCMLocalServiceControl SQLSCMLocalServiceControlA
#define SQLSCMGetLocalServiceState SQLSCMGetLocalServiceStateA
#endif // !UNICODE

#ifdef __cplusplus
}
#endif

#endif

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10 楼public（九天十地菩萨摇头怕怕，霹雳金光雷电掌@!@）回复于 2001-12-25 10:20:55 得分 0

stdafx.h:
// 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__9DFEB815_3B4F_11D4_9438_00C04F2770EA__INCLUDED_)
#define AFX_STDAFX_H__9DFEB815_3B4F_11D4_9438_00C04F2770EA__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

// TODO: reference additional headers your program requires here
#include <windows.h>
#include <stdio.h>

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

#endif // !defined(AFX_STDAFX_H__9DFEB815_3B4F_11D4_9438_00C04F2770EA__INCLUDED_)
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11 楼mazizhen（冰蓝）回复于 2001-12-25 11:06:11 得分 0

你在VB中的声明里，那个Long参数用的是 Byval
而你在DLL的声明里，那个是LPDWORD是指针，这样不会出现问题吗？NULL指针啊！！Top

12 楼public（九天十地菩萨摇头怕怕，霹雳金光雷电掌@!@）回复于 2001-12-25 11:34:56 得分 0

to ：　mazizhen(Mzz)　
我该成指针也一样.
Public Declare Function SQLSCMLocalServiceState Lib "E:\zzz\w95scm.dll" _
Alias "SQLSCMGetLocalServiceStateA" (ByVal lpszsev As String, pdwerr As Long) As Long
仍然：error :run-time error '49',bad DLL calling convetion

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13 楼greensleeve（绿袖子）回复于 2001-12-28 15:10:48 得分 58

我来了Top

14 楼xuxia（旋风）回复于 2001-12-28 15:13:56 得分 0

不要BYVAL试试。Top