13518219792
内存不会增加，是自动释放，重新定义New ArrayList后集合aa原值所占空间自动释放
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实际上 Dim aa as ArrayList : aa = New ArrayList可以合并放在循环体内如
Do While .....
Dim aa As New ArrayList
........
........
Loop
如果是数据共享：
数据库。。
文本。。
如果是要用函数之类的用接口：
WEBSERVICE
DLL引用等等
你说的不太清楚~~~
补充下最好
kyd3000 00:27:08
如果没有时效性又不即时更新的数据
kyd3000 00:27:53
就写在XML文件里吧，A程序写，B以后的程序都读他就行了。
kyd3000 00:32:36
如果想性能好点可以用内存共享：
太大，而且访问频率不高的话还是用文件来交互吧！
我不会VB，但是都是.net。c#的代码稍微转换一下就可以了。
C#实现访问网络共享文件夹，使用 WNetAddConnection2A 和 WNetCancelConnection2A。
在目标服务器建立共享文件夹，建立访问账号test;
public enum ERROR_ID
{
ERROR_SUCCESS = 0, // Success
ERROR_BUSY = 170,
ERROR_MORE_DATA = 234,
ERROR_NO_BROWSER_SERVERS_FOUND = 6118,
ERROR_INVALID_LEVEL = 124,
ERROR_ACCESS_DENIED = 5,
ERROR_INVALID_PASSWORD = 86,
ERROR_INVALID_PARAMETER = 87,
ERROR_BAD_DEV_TYPE = 66,
ERROR_NOT_ENOUGH_MEMORY = 8,
ERROR_NETWORK_BUSY = 54,
ERROR_BAD_NETPATH = 53,
ERROR_NO_NETWORK = 1222,
ERROR_INVALID_HANDLE_STATE = 1609,
ERROR_EXTENDED_ERROR = 1208,
ERROR_DEVICE_ALREADY_REMEMBERED = 1202,
ERROR_NO_NET_OR_BAD_PATH = 1203
}
public enum RESOURCE_SCOPE
{
RESOURCE_CONNECTED = 1,
RESOURCE_GLOBALNET = 2,
RESOURCE_REMEMBERED = 3,
RESOURCE_RECENT = 4,
RESOURCE_CONTEXT = 5
}
public enum RESOURCE_TYPE
{
RESOURCETYPE_ANY = 0,
RESOURCETYPE_DISK = 1,
RESOURCETYPE_PRINT = 2,
RESOURCETYPE_RESERVED = 8,
}
public enum RESOURCE_USAGE
{
RESOURCEUSAGE_CONNECTABLE = 1,
RESOURCEUSAGE_CONTAINER = 2,
RESOURCEUSAGE_NOLOCALDEVICE = 4,
RESOURCEUSAGE_SIBLING = 8,
RESOURCEUSAGE_ATTACHED = 16,
RESOURCEUSAGE_ALL = (RESOURCEUSAGE_CONNECTABLE | RESOURCEUSAGE_CONTAINER | RESOURCEUSAGE_ATTACHED),
}
public enum RESOURCE_DISPLAYTYPE
{
RESOURCEDISPLAYTYPE_GENERIC = 0,
RESOURCEDISPLAYTYPE_DOMAIN = 1,
RESOURCEDISPLAYTYPE_SERVER = 2,
RESOURCEDISPLAYTYPE_SHARE = 3,
RESOURCEDISPLAYTYPE_FILE = 4,
RESOURCEDISPLAYTYPE_GROUP = 5,
RESOURCEDISPLAYTYPE_NETWORK = 6,
RESOURCEDISPLAYTYPE_ROOT = 7,
RESOURCEDISPLAYTYPE_SHAREADMIN = 8,
RESOURCEDISPLAYTYPE_DIRECTORY = 9,
RESOURCEDISPLAYTYPE_TREE = 10,
RESOURCEDISPLAYTYPE_NDSCONTAINER = 11
}
[StructLayout(LayoutKind.Sequential)]
public struct NETRESOURCE
{
public RESOURCE_SCOPE dwScope;
public RESOURCE_TYPE dwType;
public RESOURCE_DISPLAYTYPE dwDisplayType;
public RESOURCE_USAGE dwUsage;
[MarshalAs(UnmanagedType.LPStr)]
public string lpLocalName;
[MarshalAs(UnmanagedType.LPStr)]
public string lpRemoteName;
[MarshalAs(UnmanagedType.LPStr)]
public string lpComment;
[MarshalAs(UnmanagedType.LPStr)]
public string lpProvider;
}
public class NetworkConnection
{
[DllImport("mpr.dll")]
public static extern int WNetAddConnection2A (NETRESOURCE[] lpNetResource, string lpPassword, string lpUserName, int dwFlags);
[DllImport("mpr.dll")]
public static extern int WNetCancelConnection2A (string sharename, int dwFlags, int fForce);
public static int Connect (string remotePath, string localPath, string username, string password)
{
NETRESOURCE[] share_driver = new NETRESOURCE[1];
share_driver[0].dwScope = RESOURCE_SCOPE.RESOURCE_GLOBALNET;
share_driver[0].dwType = RESOURCE_TYPE.RESOURCETYPE_DISK;
share_driver[0].dwDisplayType = RESOURCE_DISPLAYTYPE.RESOURCEDISPLAYTYPE_SHARE;
share_driver[0].dwUsage = RESOURCE_USAGE.RESOURCEUSAGE_CONNECTABLE;
share_driver[0].lpLocalName = localPath;
share_driver[0].lpRemoteName = remotePath;
Disconnect(localPath);
int ret = WNetAddConnection2A(share_driver, password, username, 1);
return ret;
}
public static int Disconnect (string localpath)
{
return WNetCancelConnection2A(localpath, 1, 1);
}
调用方式：
public static void TestNetWorkConnection()
{
string localpath = "X:";
//int status = NetworkConnection.Connect(@"\\192.168.0.2\test", localpath, @"test", "test");
int status = NetworkConnection.Connect("\\\\192.168.0.2\\test", localpath, @"test", "test");
if (status == (int)ERROR_ID.ERROR_SUCCESS)
{
FileStream fs = new FileStream(localpath + @"\\123.txt", FileMode.OpenOrCreate);
using (StreamWriter stream = new StreamWriter(fs))
{
stream.WriteLine("你好呀，成功了");
stream.Flush();
stream.Close();
}
fs.Close();
}
else
{
Console.WriteLine(status);
}
NetworkConnection.Disconnect(localpath);
}
vb.net 根本就访问不了内存，只能通过调用api函数方式，不光是vb.net ，C#也是，主要是为了安全，微软在net里面不容许直接访问内存。
这个可以实现，但VB中很难。
如果要实现两个程序共享信息，最简单的方法有共享文件和共享注册表的方法来互通信息。
如果你使用VB.NET编写程序，则可以在4.0中选择内存文件映射来共享一片内存
