INTRODUCTION:
I am trying to use
ReadDirectoryChangesW[
^] asynchronously in a loop.
Below snippet illustrates what I am trying to achieve:
DWORD example()
{
DWORD error = 0;
OVERLAPPED ovl = { 0 };
ovl.hEvent = ::CreateEvent(NULL, TRUE, FALSE, NULL);
if (NULL == ovl.hEvent) return ::GetLastError();
char buffer[1024];
while(1)
{
foo();
error = ::ReadDirectoryChangesW(
m_hDirectory, buffer, sizeof(buffer), FALSE,
FILE_NOTIFY_CHANGE_FILE_NAME,
NULL, &ovl, NULL);
if(error) processBuffer(buffer);
else if(error == ERROR_IO_PENDING) continue;
else return ::GetLastError();
}
}
PROBLEM:
I do not know how to handle the case when
ReadDirectoryChangesW
returns
FALSE
with
GetLastError()
code being
ERROR_IO_PENDING
.
In that case I should just continue with the loop and keep looping until
ReadDirectoryChangesW
returns
buffer
I can process.
QUESTION:
Since the below MVCE illustrates very well what I am trying to do (print the names of the newly added files), can you show me what must be fixed in the while loop in order for it to work?
Again, the point is to use ReadDirectoryChangesW asynchronously, in a loop, as shown in the snippet from the INTRODUCTION.
What I have tried:
I have tried using
WaitForSingleObject(ovl.hEvent, 1000)
but it crashes with error
1450 ERROR_NO_SYSTEM_RESOURCES
.
Below is the MVCE that reproduces this behavior:
#include <iostream>
#include <windows.h>
DWORD processDirectoryChanges(const char *buffer)
{
DWORD offset = 0;
char fileName[MAX_PATH] = "";
FILE_NOTIFY_INFORMATION *fni = NULL;
do
{
fni = (FILE_NOTIFY_INFORMATION*)(&buffer[offset]);
int ret = ::WideCharToMultiByte(CP_ACP, 0, fni->FileName,
fni->FileNameLength / sizeof(WCHAR),
fileName, sizeof(fileName), NULL, NULL);
switch (fni->Action)
{
case FILE_ACTION_ADDED:
{
std::cout << fileName << std::endl;
}
break;
default:
break;
}
::memset(fileName, '\0', sizeof(fileName));
offset += fni->NextEntryOffset;
} while (fni->NextEntryOffset != 0);
return 0;
}
int main()
{
HANDLE hDir = ::CreateFile("C:\\Users\\nenad.smiljkovic\\Desktop\\test",
FILE_LIST_DIRECTORY,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL, OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED, NULL);
if (INVALID_HANDLE_VALUE == hDir) return ::GetLastError();
OVERLAPPED ovl = { 0 };
ovl.hEvent = ::CreateEvent(NULL, TRUE, FALSE, NULL);
if (NULL == ovl.hEvent) return ::GetLastError();
DWORD error = 0, br;
char buffer[1024];
while (1)
{
error = ::ReadDirectoryChangesW(hDir,
buffer, sizeof(buffer), FALSE,
FILE_NOTIFY_CHANGE_FILE_NAME,
NULL, &ovl, NULL);
if (0 == error)
{
error = ::GetLastError();
if (ERROR_IO_PENDING != ::GetLastError())
{
::CloseHandle(ovl.hEvent);
::CloseHandle(hDir);
return error;
}
}
error = ::WaitForSingleObject(ovl.hEvent, 0);
switch (error)
{
case WAIT_TIMEOUT:
break;
case WAIT_OBJECT_0:
{
error = processDirectoryChanges(buffer);
if (error > 0)
{
::CloseHandle(ovl.hEvent);
::CloseHandle(hDir);
return error;
}
if (0 == ::ResetEvent(ovl.hEvent))
{
error = ::GetLastError();
::CloseHandle(ovl.hEvent);
::CloseHandle(hDir);
return error;
}
}
break;
default:
error = ::GetLastError();
::CloseHandle(ovl.hEvent);
::CloseHandle(hDir);
return error;
break;
}
}
return 0;
}
Reading through the documentation, it seems that I need
GetOverlappedResult[
^] with last parameter set to
FALSE
but I do not know how to use this API properly.