C / C++ / MFC

17-Aug-06 19:07

Hi,

I have developed an application which creates .mdb files in a specific folder named store. This folder is created during installation. But when the program is uninstalled, since there are additional(new) files in the folder store, the folder does not get deleted from the computer.

I thought, maybe I should create a small .exe program that deletes all the .mdbfiles from the store folder before the uninstall is run.

The problem here is that I do not know the names of the files in the folder. Is there anyway or any function by which I can find and delete all .mdb files from the folder store?

Thanks.

Fortitudine Vincimus!

Hamid_RT17-Aug-06 19:28

17-Aug-06 19:28

Is this good?

<br />
WIN32_FIND_DATA      find;	<br />
SetCurrentDirectory("c:\\temp");	<br />
HANDLE handle=FindFirstFile("*.mdb",&find);<br />
	while(FindNextFile(handle,&find)!=0)<br />
	DeleteFile(find.cFileName);<br />
FindClose(handle);<br />
or you can use from //SHFileOperation(...);	<br />

WhiteSky

normanS17-Aug-06 19:34

normanS

17-Aug-06 19:34

Because you do findfirst() and findnext() before you do DeleteFile(), I think this will leave one mdb file behind.

Hamid_RT17-Aug-06 19:38

CString / ::GetModuleFileName troubling

17-Aug-06 19:38

No problem we can use from a Do while and yes its right.

<br />
WIN32_FIND_DATA find; <br />
SetCurrentDirectory("c:\\temp"); <br />
HANDLE handle=FindFirstFile("*.mdb",&find);<br />
do<br />
DeleteFile(find.cFileName);//or you can use from //SHFileOperation(...); <br />
while(FindNextFile(handle,&find)!=0);<br />
FindClose(handle);<br />

WhiteSky

Tara1417-Aug-06 23:34

17-Aug-06 23:34

This is the program that I tried.

#include "afxdisp.h"

void main()
{

	WIN32_FIND_DATA find;
	char	aExePath[_MAX_PATH];
	char	aDrive[_MAX_DRIVE];
	char	aDir[_MAX_DIR];
	CString	aPath;

	::GetModuleFileName( AfxGetInstanceHandle(),aExePath,sizeof(aExePath));
	
	_splitpath(aExePath,aDrive,aDir,NULL,NULL);

	aPath.Format("%s%s",aDrive,aDir);
	aPath =  aPath + "sbh_store";

	SetCurrentDirectory(aPath); 
	HANDLE handle=FindFirstFile("*.mdb",&find);
	do
	DeleteFile(find.cFileName);
	while(FindNextFile(handle,&find)!=0);
	FindClose(handle);

}

Here I get the error

nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __endthreadex
nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __beginthreadex

When I comment out

CString	aPath;<br />
::GetModuleFileName( AfxGetInstanceHandle(),aExePath,sizeof(aExePath));

I do not get the unresolved external symbol error. I guess I am missing something.

Please can you tell me what I am not doing right. Have I missed out a header?

-- modified at 5:40 Friday 18th August, 2006

Fortitudine Vincimus!

prasad_som17-Aug-06 23:48

prasad_som

17-Aug-06 23:48

see this solution

Prasad
Notifier using ATL

Tara1418-Aug-06 4:14

18-Aug-06 4:14

Ah! How did I miss it.

Thanks a billion!

Fortitudine Vincimus!

Hamid_RT18-Aug-06 4:47

18-Aug-06 4:47

Is your problem solve

WhiteSky

Tara1418-Aug-06 4:55

18-Aug-06 4:55

Yes. Changing the settings helped.

But there is something I do not understand.

I used
::GetModuleFileName( AfxGetInstanceHandle(),aExePath,sizeof(aExePath));
in my application using mfc. There I had no problem.

But in the C++ program that I wrote to delete files form a folder, AfxGetInstanceHandle() was causing assersion failure. I could'nt figure out why.

When I changed it to NULL
>::GetModuleFileName( NULL,aExePath,sizeof(aExePath));
it worked fine.

Why?

Fortitudine Vincimus!

Michael Dunn17-Aug-06 19:37

Michael Dunn

17-Aug-06 19:37

You can use SHFileOperation() which takes wildcards.

--Mike--
Visual C++ MVP Cool | :cool:

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Sarath C17-Aug-06 20:06

Sarath C

17-Aug-06 20:06

is it safe(shell API have some dependency on the version?) to use shell API, if we there are some other win32 APi to do the same task?
is it faster than Win32 APIs?

SaRath.

"Before you can learn to recognize what's wrong, you must learn to recognize what's right" - Raymond Chen."

My Blog | Understanding State Pattern

kakan17-Aug-06 21:00

kakan

17-Aug-06 21:00

According to my experience, it's risky to do changes in a directory structure while doing a FindFirst/Findnext loop. I have had problems doing that (such as deleting the found files) in the past.
IMO, ShFileOperation is safer, and I would use it.

Alcohol. The cause of, and the solution to, all of life's problems - Homer Simpson

SHFileOperation

Tara1417-Aug-06 23:38

Re: SHFileOperation [modified]

17-Aug-06 23:38

I tried using SHFileOperation. But the program is crashing.

This is what I did:

SHFILEOPSTRUCT del;

	del.hwnd = NULL;
	del.wFunc = FO_DELETE;
	del.pFrom = "C:\\temp\\*.mdb";
	del.fFlags = FOF_FILESONLY;

	SHFileOperation(&del);

Something is wrong here. I tried searching the net, but I am not able to figure it out. Please can you help me.

Thanks.

Fortitudine Vincimus!

prasad_som17-Aug-06 23:59

prasad_som

17-Aug-06 23:59

you need to set del.pTo ,too.
i.e.
set it to NULL if you are not using it.
code will be,

SHFILEOPSTRUCT del;
del.hwnd = NULL;
del.wFunc = FO_DELETE;
del.pFrom = "C:\\temp\\*.mdb";
del.fFlags = FOF_FILESONLY;
del.pTo = NULL;
SHFileOperation(&del);

Oh ! you got it right already. Smile | :)

-- modified at 5:59 Friday 18th August, 2006

Prasad
Notifier using ATL

SHFileOperation

Tara1417-Aug-06 23:53

Re: deleting all files from a folder [modified]

17-Aug-06 23:53

OH! I got it!!

The pTo member of the

SHFILEOPSTRUCT<br />

structure shoud be assigned NULL!

Thanks.

Fortitudine Vincimus!

Kleser18-Aug-06 4:24

Kleser

18-Aug-06 4:24

hi,
i don't want to give you an answer, instead i would like to ask about how you can make your app create an mdb file. because this is what i trying to do right now. if you don't mind, would you share me you little secret?

thanks in advance.

cheers

-- modified at 10:25 Friday 18th August, 2006

Tara1418-Aug-06 4:48

18-Aug-06 4:48

Hello,

I use DAO to make the connection. There are some really nice samples that come in msdn. I wrote my own little class to do the stuff taking help from the samples.

Here is the database creation part. My database needed to be locked with a password.

//////////////////////////////////////////////////////
/////////********* CREATE DATABASE ***********///////////////////////////

void CDBcreate::CreateDatabase(CString m_strDBName)
{
	
int dwOptions =0;
dwOptions |=dbVersion30;


//Release table if selected
if (m_pTableDef)
{
	m_pTableDef->Close();
	delete m_pTableDef;
	m_pTableDef = NULL;
}

//close database if open
if (m_pDatabase)
{
	m_pDatabase->Close();
	delete m_pDatabase;
	m_pDatabase=NULL;
}

//create new database
m_pDatabase = new CDaoDatabase;
m_pDatabase->Create(m_strDBName, dbLangGeneral,dwOptions);

CString strConnect( _T( ";pwd=" ) );
COleVariant NewPassword( "password", VT_BSTRT ),OldPassword( "", VT_BSTRT );
DAO_CHECK( m_pDatabase->m_pDAODatabase->NewPassword( V_BSTR( &OldPassword ),
              V_BSTR( &NewPassword ) ) );
m_bOpen=TRUE; // flag of currently open table

}

/////////********* END CREATE DATABASE ***********///////////////////////////

Fortitudine Vincimus!

Arrays...

HakunaMatada17-Aug-06 18:33

HakunaMatada

17-Aug-06 18:33

Hi,

What is an array in VC++? Is it a class? Lets say I create an array of ints with int i[20], then does it mean that objects of a hidden array class is created? What actually is an array? And is there a Dynamic array implementation in the std namespace?

---

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It's our problem free, Philosophy
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Re: Arrays...

_AnsHUMAN_ 17-Aug-06 18:45

_AnsHUMAN_

17-Aug-06 18:45

Hakuna-Matada wrote:
What actually is an array?

An array is a collection of similar datatypes that are stored in contiguous memory locations.

Hakuna-Matada wrote:
array class

The array is not a class. It's just a collection of object/datatypes.
If it would have been a class you would be able to create an object of that class and then you could iterate through the elements of the array using that (objectvalue.something)

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: Arrays...

Hamid_RT17-Aug-06 19:28