VB调用C动态库，程序崩溃，高手帮忙！特急
最近做项目用VB做了个管理界面，需要调用C程序编写的DLL函数，遇到问题如下：
C函数原型：
__declspec (dllexport) int WINAPI pwdencypt (char *merchant, char *oper, char *pos_id, char *inword, char *outword)
VB申明如下：
Declare Function pwdencypt Lib "pinkey.dll " (ByVal merchant As String, ByVal oper As String, ByVal pos_id As String, ByVal inword As String, outword As string) As Long
VB中调用如下：
Dim var1 As String
Dim var2 As String
Dim var3 As String
Dim var4 As String
Dim var5 As String*16
var1 = "105150252711111 "
var2 = "8112 "
var3 = "1112 "
var4 = "111111 "
Dim ret As Long
ret = pwdencypt(var1, var2, var3, var4, var5)
......
VB调用该函数希望得到var5的值，但程序执行到这里VB就崩溃了。我在函数pwdencypt中打印了日志，显示出var1, var2, var3, var4传入的值都正确，var5所对应的outword也有值了，而且都正确。但是VB总是崩溃，也检查了var5的长度，应该足够了。网上找了很多例子，都没有找到解决方案。求高手帮忙看看，在此谢谢了。
[解决办法]
你就是要地址传递，返回得到的值，我以前做过的，你去看看我的贴子
http://topic.csdn.net/T/20060307/16/4598697.html
http://topic.csdn.net/T/20060305/22/4594229.html
