vb调用DELPHI写的动态库问题

[bcwtsy]

vb调用DELPHI写的动态库问题


function MXReadFingerFromSensor(FingerBufchar):Boolean; stdcall; external 'JLZD02.DLL'\\DELPHI中的函数


VB中的代码:
Public Declare Function drjw Lib "JLZD02.DLL" Alias "MXReadFingerFromSensor" (ByVal Pchar As String) As Boolean
Private Sub Command5_Click()
dim s as string
s = String(255, vbNullChar)
If (drjw(s) = False) Then
MsgBox "读入失败!"
Else
MsgBox "读入成功!"
End If
End Sub

程序运行后,提示内存读取错误,然后自动关闭VB,问题出在哪啊,高手帮帮忙吧,弄了一天也没解决啊!!!!

[迈克揉索芙特]

这样试试
If (drjw(strptr(s)) = False) Then

[supergreenbean]

Public Declare Function drjw Lib "JLZD02.DLL" Alias "MXReadFingerFromSensor" (ByVal Pchar As String) As Long

看下你的文档中有关Pchar缓冲区的要求。

[bcwtsy]

以上两种的方法都行不通,第一种仍然提示内存读取错误,第二种在释放设备的时候提示内存读取错误!
delphi中是这样定义的:
var
FingerBuf:Array[0..303,0..255] of char;
函数是这样的:function MXReadFingerFromSensor(FingerBuf:Pchar):Boolean; stdcall; external 'JLZD02.DLL'

哪位帮忙解决一下吧!急死我了!!!!!

[supergreenbean]

原来是个二维数组,难怪呢

你这样试试

Public Declare Function drjw Lib "JLZD02.DLL" Alias "MXReadFingerFromSensor" (Pchar As Any) As Long
Private Sub Command5_Click()
dim chars(303,255) as byte
If (drjw(chars(0,0) = False) Then
MsgBox "读入失败!"
Else
MsgBox "读入成功!"
End If
End Sub

[bcwtsy]

万分感谢!!!你的方法是对的,问题终于解决了!!!!!!!!!!!!!!!!!!!!!!!!