#include <iostream.h> #include <windows.h>int main(int argc, char *argv[]) { HANDLE changeHandle; // Wait for a file name change in the // current directory changeHandle = FindFirstChangeNotification("c:\\", FALSE, FILE_NOTIFY_CHANGE_FILE_NAME); cout << "Waiting for a change ..." << endl; WaitForSingleObject(changeHandle, INFINITE); cout << "A file name changed." << endl; // Wait for a second change FindNextChangeNotification(changeHandle); cout << "Waiting for a 2nd change ..." << endl; WaitForSingleObject(changeHandle, INFINITE); cout << "A file name changed." << endl; // quit FindCloseChangeNotification(changeHandle); return( 0 ); } 这是监视文件变化，把FILE_NOTIFY_CHANGE_FILE_NAME该成FILE_NOTIFY_CHANGE_DIR_NAME就可以做目录监视了
INFINITE,的含义？能不能监视目录是否共享呢？谢谢
WaitForSingleObject The WaitForSingleObject function returns when one of the following occurs: The specified object is in the signaled state. The time-out interval elapses. DWORD WaitForSingleObject( HANDLE hHandle, // handle to object to wait for DWORD dwMilliseconds // time-out interval in milliseconds );
Parameters hHandle Handle to the object. For a list of the object types whose handles can be specified, see the following Res section. Windows NT: The handle must have SYNCHRONIZE access. For more information, see Standard Access Rights. dwMilliseconds Specifies the time-out interval, in milliseconds. The function returns if the interval elapses, even if the object's state is nonsignaled. If dwMilliseconds is zero, the function tests the object's state and returns immediately. If dwMilliseconds is INFINITE, the function's time-out interval never elapses. Return Values If the function succeeds, the return value indicates the event that caused the function to return. This value can be one of the following. Value Meaning WAIT_ABANDONED The specified object is a mutex object that was not released by the thread that owned the mutex object before the owning thread terminated. Ownership of the mutex object is granted to the calling thread, and the mutex is set to nonsignaled. WAIT_OBJECT_0 The state of the specified object is signaled. WAIT_TIMEOUT The time-out interval elapsed, and the object's state is nonsignaled. If the function fails, the return value is WAIT_FAILED. To get extended error information, call GetLastError. Res The WaitForSingleObject function checks the current state of the specified object. If the object's state is nonsignaled, the calling thread enters an efficient wait state. The thread consumes very little processor time while waiting for the object state to become signaled or the time-out interval to elapse.Before returning, a wait function modifies the state of some types of synchronization objects. Modification occurs only for the object whose signaled state caused the function to return. For example, the count of a semaphore object is decreased by one. The WaitForSingleObject function can wait for the following objects: Change notification Console input Event Job Mutex Process Semaphore Thread Waitable timer
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#include <windows.h>int main(int argc, char *argv[])
{
HANDLE changeHandle; // Wait for a file name change in the
// current directory
changeHandle = FindFirstChangeNotification("c:\\",
FALSE, FILE_NOTIFY_CHANGE_FILE_NAME);
cout << "Waiting for a change ..."
<< endl;
WaitForSingleObject(changeHandle, INFINITE);
cout << "A file name changed." << endl; // Wait for a second change
FindNextChangeNotification(changeHandle);
cout << "Waiting for a 2nd change ..."
<< endl;
WaitForSingleObject(changeHandle, INFINITE);
cout << "A file name changed." << endl; // quit
FindCloseChangeNotification(changeHandle);
return( 0 );
}
这是监视文件变化，把FILE_NOTIFY_CHANGE_FILE_NAME该成FILE_NOTIFY_CHANGE_DIR_NAME就可以做目录监视了
The WaitForSingleObject function returns when one of the following occurs: The specified object is in the signaled state.
The time-out interval elapses.
DWORD WaitForSingleObject(
HANDLE hHandle, // handle to object to wait for
DWORD dwMilliseconds // time-out interval in milliseconds
);
Parameters
hHandle
Handle to the object. For a list of the object types whose handles can be specified, see the following Res section.
Windows NT: The handle must have SYNCHRONIZE access. For more information, see Standard Access Rights. dwMilliseconds
Specifies the time-out interval, in milliseconds. The function returns if the interval elapses, even if the object's state is nonsignaled. If dwMilliseconds is zero, the function tests the object's state and returns immediately. If dwMilliseconds is INFINITE, the function's time-out interval never elapses.
Return Values
If the function succeeds, the return value indicates the event that caused the function to return. This value can be one of the following. Value Meaning
WAIT_ABANDONED The specified object is a mutex object that was not released by the thread that owned the mutex object before the owning thread terminated. Ownership of the mutex object is granted to the calling thread, and the mutex is set to nonsignaled.
WAIT_OBJECT_0 The state of the specified object is signaled.
WAIT_TIMEOUT The time-out interval elapsed, and the object's state is nonsignaled.
If the function fails, the return value is WAIT_FAILED. To get extended error information, call GetLastError. Res
The WaitForSingleObject function checks the current state of the specified object. If the object's state is nonsignaled, the calling thread enters an efficient wait state. The thread consumes very little processor time while waiting for the object state to become signaled or the time-out interval to elapse.Before returning, a wait function modifies the state of some types of synchronization objects. Modification occurs only for the object whose signaled state caused the function to return. For example, the count of a semaphore object is decreased by one. The WaitForSingleObject function can wait for the following objects: Change notification
Console input
Event
Job
Mutex
Process
Semaphore
Thread
Waitable timer