Sir:
I have used FileSystemWathc her(.NET class) to monitor file change
envent.The code as list:
............... .......
int i=0; //Counter for Changed event after FileCreated event
private void IntializeFileSy stemWatcher()
{
//Create File System Watcher in mypath for new files
fsWatcher=new System.IO.FileS ystemWatcher(my path,"*.*");
// Add event handlers for new files and change of existing files.
fsWatcher.Chang ed += new FileSystemEvent Handler(OnFileC hanged);
fsWatcher.Creat ed += new FileSystemEvent Handler(OnFileC reated);
// Begin watching.
fsWatcher.Enabl eRaisingEvents = true;
}
private void OnFileChanged(o bject source, FileSystemEvent Args e)
{
i++;
}
/// <summary>
/// Event Handler for File Created
///
/// </summary>
private void OnFileCreated(o bject source, FileSystemEvent Args e)
{
i=0;
Thread thread=new Thread(new ThreadStart(thi s.StartListen)) ;
thread.Start();
}
//Wait for Changed event fired,But only get once.
void StartListen()
{
WaitForChangedR esult
r=fsWatcher.Wai tForChanged(Wat cherChangeTypes .Changed);
bool b=r.TimedOut;
}
............... .......
When I break at "bool b=r.TiedOut" this line,I got only one Changed
event.But when I check i value,it is more then 1.
Why????
inexplicability !!!!
Is there something wrong? Can you help me to explain this situation?
Thank You!!! 2 1609
If you have a lot of changes in a small time, you might get just one
notification.
From http://msdn2.microsoft.com/en-us/lib...ze(VS.80).aspx
"The Windows operating system notifies your component of file changes in a
buffer created by the FileSystemWatch er. If there are many changes in a
short time, the buffer can overflow. This causes the component to lose track
of changes in the directory, and it will only provide blanket notification."
Laura
"gates.liu" <ga*******@disc ussions.microso ft.com> ha scritto nel messaggio
news:8D******** *************** ***********@mic rosoft.com... Sir: I have used FileSystemWathc her(.NET class) to monitor file change envent.The code as list:
............... .......
int i=0; //Counter for Changed event after FileCreated event private void IntializeFileSy stemWatcher() { //Create File System Watcher in mypath for new files fsWatcher=new System.IO.FileS ystemWatcher(my path,"*.*");
// Add event handlers for new files and change of existing files. fsWatcher.Chang ed += new FileSystemEvent Handler(OnFileC hanged); fsWatcher.Creat ed += new FileSystemEvent Handler(OnFileC reated);
// Begin watching. fsWatcher.Enabl eRaisingEvents = true;
}
private void OnFileChanged(o bject source, FileSystemEvent Args e) { i++; }
/// <summary> /// Event Handler for File Created /// /// </summary> private void OnFileCreated(o bject source, FileSystemEvent Args e) { i=0; Thread thread=new Thread(new ThreadStart(thi s.StartListen)) ; thread.Start(); }
//Wait for Changed event fired,But only get once. void StartListen() { WaitForChangedR esult r=fsWatcher.Wai tForChanged(Wat cherChangeTypes .Changed); bool b=r.TimedOut; } ............... .......
When I break at "bool b=r.TiedOut" this line,I got only one Changed event.But when I check i value,it is more then 1. Why???? inexplicability !!!! Is there something wrong? Can you help me to explain this situation? Thank You!!!
You are right about event buffer.
My code can capture more then one changed event notify. But use
WaitForChanged( ) API,I can only capture 1 changed event,where are others? I
want to know underground processing about event notify, maybe I can get
explain with more reason.
“Laura T.”编写: If you have a lot of changes in a small time, you might get just one notification.
From http://msdn2.microsoft.com/en-us/lib...ze(VS.80).aspx
"The Windows operating system notifies your component of file changes in a buffer created by the FileSystemWatch er. If there are many changes in a short time, the buffer can overflow. This causes the component to lose track of changes in the directory, and it will only provide blanket notification."
Laura
"gates.liu" <ga*******@disc ussions.microso ft.com> ha scritto nel messaggio news:8D******** *************** ***********@mic rosoft.com... Sir: I have used FileSystemWathc her(.NET class) to monitor file change envent.The code as list:
............... .......
int i=0; //Counter for Changed event after FileCreated event private void IntializeFileSy stemWatcher() { //Create File System Watcher in mypath for new files fsWatcher=new System.IO.FileS ystemWatcher(my path,"*.*");
// Add event handlers for new files and change of existing files. fsWatcher.Chang ed += new FileSystemEvent Handler(OnFileC hanged); fsWatcher.Creat ed += new FileSystemEvent Handler(OnFileC reated);
// Begin watching. fsWatcher.Enabl eRaisingEvents = true;
}
private void OnFileChanged(o bject source, FileSystemEvent Args e) { i++; }
/// <summary> /// Event Handler for File Created /// /// </summary> private void OnFileCreated(o bject source, FileSystemEvent Args e) { i=0; Thread thread=new Thread(new ThreadStart(thi s.StartListen)) ; thread.Start(); }
//Wait for Changed event fired,But only get once. void StartListen() { WaitForChangedR esult r=fsWatcher.Wai tForChanged(Wat cherChangeTypes .Changed); bool b=r.TimedOut; } ............... .......
When I break at "bool b=r.TiedOut" this line,I got only one Changed event.But when I check i value,it is more then 1. Why???? inexplicability !!!! Is there something wrong? Can you help me to explain this situation? Thank You!!!
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