我想在我的应用程序(特别是Windows服务)中实现内存映射文件,然后使用C#表单从服务写入的MMF中读取。不幸的是,我似乎无法从MMF中读取任何内容,更重要的是,表单似乎从未找到由服务创建的MMF。下面是代码片段,概述了我在做什么,任何人都可以看到我做错了什么,或者能够指引我朝着更好的方向发展?从内存映射文件读取时出错
服务:
private MemoryMappedFile mmf = MemoryMappedFile.CreateOrOpen("AuditStream", 1024 * 1024);
private Mutex mutex = new Mutex(false, "MyMutex");
byte[] msg = new byte[1];
var view = mmf.CreateViewStream(0, 1);
byte[] rmsg = new byte[1];
for (int i = 0; i < 400; i++)
{
mutex.WaitOne();
for (int j = 0; j < msg.Length; j++)
{
msg[j] = (byte)i;
}
view.Position = 0;
view.Write(msg, 0, bufferSize);
//the next 3 lines verify that i wrote to the mmf and can potentially read from it
//These are just for testing
view.Position = 0;
view.Read(rmsg, 0, 1);
Log.Error("Finished MMF", rmsg[0].ToString());
mutex.ReleaseMutex();
}
形式:
private MemoryMappedFile mmf;
private Mutex mutex;
Thread t = new Thread(MmfMonitor);
t.Start();
private void MmfMonitor()
{
byte[] message = new byte[1];
while(!quit)
{
try
{
**mmf = MemoryMappedFile.OpenExisting("AuditStream");**
mutex = Mutex.OpenExisting("MyMutex");
var view = mmf.CreateViewStream(0, 1);
mutex.WaitOne();
view.Position = 0;
view.Read(message, 0, 1);
Invoke(new UpdateLabelCallback(UpdateLabel), message[0].ToString());
mutex.ReleaseMutex();
}catch(FileNotFoundException)
{
**//The AuditStream MMF is never found, and therefore doesnt every see the proper values**
}
}
}
此外,虽然该服务是 '正在运行' 时,MMF应该始终有一个手柄,不应该被垃圾收集器收集得到;
所以,你确实是得到FileNotFoundException异常? – 2012-07-18 18:10:19
表单是否与服务位于同一个目录下?有时服务的默认目录是c:\ windows \ system32我会尝试指定文件的完整路径,而不是像“AuditStream”这样的相对路径 – 2012-07-18 18:11:03
服务在哪个帐户下运行? – HABO 2012-07-18 18:22:35