C / C++ / MFC

Re: I cannot create a Release version.

14-Jan-20 23:57

Thank you, your tip was useful. I checked all places in the project's settings where I met the word "manifest" and found one, where settings for Debug and Release were different. Release wanted to generate manifest file, but Debug did not. I excluded manifest generation for the Release version and finally got it.

Richard MacCutchan14-Jan-20 23:58

14-Jan-20 23:58

Has happened to me more than once.

SetWindowsHookEx failed

Member 1410515513-Jan-20 9:54

13-Jan-20 9:54

Look, guys, I have a code that worked properly under Windows XP 32 bit.
hHookMsg = SetWindowsHookEx(WH_JOURNALPLAYBACK, hkprc, hInst, 0). But under Windows 7 64 bit this call failed and I got System Error Message "Acces denied"
I tried this:
hHookMsg = SetWindowsHookEx(WH_JOURNALPLAYBACK, hkprc, hInst, GetCurrentThreadId())
and this
hHookMsg = SetWindowsHookEx(WH_JOURNALPLAYBACK, hkprc, (HINSTANCE)NULL, GetCurrentThreadId())
and got "This hook can be set only globally".
Any ideas how to resolve the situation?

leon de boer13-Jan-20 11:49

leon de boer

13-Jan-20 11:49

They have put security around that sort of thing and you probably have to be running as administrator and it's likely going to throw a UAC to user to confirm it is okay. Goto MSDN and look at the documentation.

In vino veritas

Member 1410515513-Jan-20 15:51

13-Jan-20 15:51

Sure. I do not need this option- it was intended to demonstrate how my prog works to another users. And they do no not like (and for a reason) when some soft wants administrative privileges.

Richard MacCutchan13-Jan-20 22:35

13-Jan-20 22:35

Member 14105155 wrote:
And they do no not like (and for a reason) when some soft wants administrative privileges.

Well they are going to have to get used to it. Windows 10 (7 is out of support in a few days) uses this extensively in order to protect the users' systems from malicious software.

Member 1410515514-Jan-20 0:34

14-Jan-20 0:34

Well, this is the reason to write soft that works without such privileges.

Richard MacCutchan14-Jan-20 0:47

14-Jan-20 0:47

You do not have a choice. The operating system sets the rules, and your software must work within those rules.

Member 1410515514-Jan-20 16:43

14-Jan-20 16:43

I do have. A program can ask a user if he let it run with privileges, but users dislike such soft. Therefore, the choice exists, but it is very poor one.

Richard MacCutchan14-Jan-20 21:40

14-Jan-20 21:40

Member 14105155 wrote:
Therefore, the choice exists, but it is very poor one.

On the contrary it is a very good one, as it allows the user to control which programs are allowed to make significant changes to their system.

IsFileReady

Erich Ruth12-Jan-20 13:34

Erich Ruth

12-Jan-20 13:34

I use this code:

Quote:
BOOL C1095C::IsFileReady(CString path)
{
HANDLE hFile = CreateFile(path.GetBuffer(), GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

if (hFile == INVALID_HANDLE_VALUE)
{
return FALSE;
}
else
{
CloseHandle(hFile);
return TRUE;
}
}

while (!IsFileReady(output.GetBuffer()))
{
Sleep(1);
}

which waits for a file to be created and then once it is, it
proceeds to the next job. The problem is, this code doesnt seem to
work every time. Im nervous now in using it. I need to wait for a
file to be full created and sometimes it may take 5+ minutes. Once its
created, then I want to move onto the next step. How can I adjust this
code to make it work every time? Please any response any one can give me
will be great appreciated.

leon de boer12-Jan-20 14:52

leon de boer

12-Jan-20 14:52

Wait on the directory change notification
ReadDirectoryChangesW function (winbase.h) - Win32 apps | Microsoft Docs[^]

This might help
GitHub - LdB-ECM/FolderWatcher[^]

In vino veritas

Stefan_Lang12-Jan-20 23:21

Stefan_Lang

12-Jan-20 23:21

Is that Linux sleep() or Windows Sleep()? Or, more to the point, are you sleeping for 1 second, or 1 millisecond? If the latter, maybe you should try to increase the time to around 100ms: The Windows file system is not very fast, and might be hamstrung by constantly trying to open nonexistant files.

GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)

leon de boer12-Jan-20 23:52

leon de boer

12-Jan-20 23:52

It's clearly windows no such thing as CreateFile in linux and he already stated it can take 5min to open the file (I assume of a network drive) so 100ms is not going to change anything Smile | :)

In vino veritas

David Crow13-Jan-20 5:02

David Crow

13-Jan-20 5:02

In addition to Leon's suggestion, there's also FindFirstChangeNotification().

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

Daniel Pfeffer13-Jan-20 23:38

Daniel Pfeffer

13-Jan-20 23:38

If you are waiting for the file to be fully created (i.e. completely written), then this code won't work. At best, it will wait until the file is created (i.e. when the other task opens it for writing).

The problem may be broken into two steps:

Wait until the file is created (i.e. it appears in the directory)
Wait until the file is closed (i.e. the writing is completed)

Others have given you good ideas about how to wait for the file to be created. In order to wait for the file to be completely written, the best way would be for the other application to create another file AFTER it is done with the data file. For example:

Your application waits for the creation of DATA.DAT
Other application creates file DATA.DAT (your application detects the creation)
Other application writes into DATA.DATA (your application waits for the creation of FINISHED.DAT)
Other application closes DATA.DAT
Other application creates FINISHED.DAT (your application detects FINISHED.DAT, and knows that DATA.DAT is ready)

There are some other points to handle (e.g. what happens if DATA.DAT is created before your application starts waiting for it?), but this is the basic idea.

Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.

Joe Woodbury14-Jan-20 20:15

Joe Woodbury

14-Jan-20 20:15

IF you know that this will be on a local drive, an alternative is to create the file in a different directory and then move it to the target directory.