DLL问题？“DLL 调用约定错误”提示。

[public]

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”

[NightBreak]

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；

[Ranma_True]

同意楼顶的

[public]

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

[public]

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

[dbcontrols]

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

[public]

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 convetion

[kingfish]

帮你UP

[fraser01]

你把C++开头声明部分贴出来看看

[public]

/***********************************************************************
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

[public]

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_)

[mazizhen]

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！！

[public]

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

[greensleeve]

我来了

[xuxia]

不要BYVAL试试。