Re: file opening :omg: - C / C++ / MFC Discussion Boards

Re: Validating network passwords through visual C++

Prem Kumar10-May-02 3:47

10-May-02 3:47

Well you could try to validate the user
by logging into the server.

BOOL LogonUser(
LPTSTR lpszUsername, // user name
LPTSTR lpszDomain, // domain or server
LPTSTR lpszPassword, // password
DWORD dwLogonType, // type of logon operation
DWORD dwLogonProvider, // logon provider
PHANDLE phToken // receive tokens handle
);

Re: Validating network passwords through visual C++

Martin Ziacek10-May-02 3:59

Martin Ziacek

10-May-02 3:59

I think that function LogonUser() could help you.

Re: Validating network passwords through visual C++

Srini Kella10-May-02 4:30

Srini Kella

10-May-02 4:30

The problem with LogonUser() is, it requires WinNT/2000. What happens if this app is intended to use from 95/98??

Some time back I did 'change password' thing. In that I loaded 'NetApi32.DLL' and got the func ptr for 'NetUserChangePassword' and used it to change the password for user under any domain. There are some more 'NetUser*' functions available in the dll. I am sure inthat, there will be a 'login' kind of function in 'NetApi32.Dll'.

The advantage of this way is the app can be run on any Windows machine. Smile | :)

Re: Validating network passwords through visual C++

Prem Kumar10-May-02 4:37

Prem Kumar

10-May-02 4:37

NetUserChangePassword
is not for Win 9X Systems

the foll. is from the MSDN.

Requirements
Windows NT/2000 or later: Requires Windows NT 3.1 or later.
Windows 95/98/Me: Unsupported.
Header: Declared in Lmaccess.h; include Lm.h.
Library: Use Netapi32.lib.

Re: Validating network passwords through visual C++

Srini Kella10-May-02 5:05

Srini Kella

10-May-02 5:05

OOPS!! I am sorry. You are right.

I recollect it now (I just opened the my old project code in soursafe
Poke tongue | ;-P

).
While changing the passwords, what I did was: For Win 9x I loaded Mpr.Dll and used some functions like PwdSetPasswordStatus, PwdChangePassword to change the network password. For other OSs I loaded NetApi32.Dll.

bye bye.

Re: Validating network passwords through visual C++

Martin Ziacek10-May-02 7:31

Martin Ziacek

10-May-02 7:31

Srini Kella wrote:
I woudl like to be able to send their username and password to a server and validate it.

I understood you would like to validate user at the server
Confused | :confused:

I guess your server is not running Win9x, so that scenario could work.

file opening :omg:

10-May-02 1:24

I'm learning MFC trough internet so I don't have a book. But I haven't found any tutorial on how to make a simple "open file" dialog. Where can I find one? Thanks

Re: file opening :omg:

Vladimir L.10-May-02 1:42

Vladimir L.

10-May-02 1:42

Just take a look here:
http://msdn.microsoft.com/library/en-us/vcmfc98/html/_mfc_cfiledialog.3a3a.cfiledialog.asp
http://msdn.microsoft.com/library/en-us/vcmfc98/html/_mfc_cfiledialog.3a3a.domodal.asp

Best regards,
Vladimir

CSTScreenBuffer Problem!!! -Can't display big size JPG image

solomoon10-May-02 1:05

solomoon

10-May-02 1:05

I'm using CSTScreenBuffer class to load image and get bitmap handle, and I'm
manipulating bits to display Images on windows-CE based paltform( pocket PC2002).
It just works fine while i'm using small sized JPG images (around50-60KB)
, but it has problem with big sized JPG images.
i can't get any valid bitmap handle at all. handle is always NULL!!!

i tried so many ways to solve this problem all weeks.
can anybody give me any clue for this trouble!!!

Of course, i used VOImage class for my project. But it has low speed and quality...

And one more question - can i use memory-mapped related functions to read
JPG image file? i tried, but it failed. ((->>jpeg_read_header(&cinfo, TRUE);))

here's my source code
//*********************************************************************8
HBITMAP CPhotoListCtrl::LoadJPG(CString strFilePath)
{
CSTScreenBuffer sts;
FILE * pFile;
JSAMPARRAY pBuffer;
int nRowSize;
ByteArray imageData(320*240*3);
struct jpeg_error_mgr jerr;
struct jpeg_decompress_struct cinfo;

if ((pFile = _tfopen(strFilePath, _T("rb"))) == NULL) {
CString strError;
strError.Format(_T("Can't open file '%s'"), strFilePath);
AfxMessageBox(strError);
return 0;
}

cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, pFile);
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
nRowSize = cinfo.output_width * cinfo.output_components;
pBuffer = (*cinfo.mem->alloc_sarray)
((j_common_ptr) &cinfo, JPOOL_IMAGE, nRowSize, 1);
while (cinfo.output_scanline < cinfo.output_height) {
jpeg_read_scanlines(&cinfo, pBuffer, 1);
imageData.Append(pBuffer[0], nRowSize);
}

//************************************************************
HBITMAP hBitmap = sts.CreateBitmapByRGBArray(imageData.GetData(), cinfo.output_width, cinfo.output_height);
//***********************************************************
// ======>>> hBitmap is NULL !!!!

jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(pFile);

return hBitmap;
}
//*********************************************************************

Convert tm to time_t

Pete Bassett9-May-02 23:57

Pete Bassett

9-May-02 23:57

Anyone got the function to do this? Its a pain in the arse!

Cheers.

Pete

Re: Convert tm to time_t

Maxwell Chen10-May-02 0:26

Maxwell Chen

10-May-02 0:26

time_t mktime(struct tm* ptr);

Maxwell Chen
People say "No news is good news". Then, no code is good code!?

Re: Convert tm to time_t

Pete Bassett10-May-02 1:39

Pete Bassett

10-May-02 1:39

Thats the one!

Cheers

Spin Button??

9-May-02 23:39

There's probably a simple explaination..

On my spin button when I press the down arrow it increments the integer value in an edit box and when I press the top arrow it decrements it. How do I fix it so that up means up and down means down!

Thanks. Confused | :confused:

Re: Spin Button??

Maxwell Chen9-May-02 23:43

Maxwell Chen

9-May-02 23:43

Assign a variable of type CSpinButtonCtrl (, and SetRange32(...) ), then it becomes what you want it to be......

Maxwell Chen
People say "No news is good news". Then, no code is good code!?

Re: Spin Button??

Prem Kumar10-May-02 4:04

Prem Kumar

10-May-02 4:04

Excerpt from MSDN for CSpinButtonCtrl

Anonymous wrote:
"
Note The default range for the spin button has the maximum set to zero (0) and the minimum set to 100. Since the maximum value is less than the minimum value, clicking the up arrow will decrease the position and clicking the down arrow will increase it. Use CSpinButtonCtrl::SetRange to adjust these values.
"

Probelm in rich edit view

SamirSood9-May-02 23:21

SamirSood

9-May-02 23:21

have a program that has two views . rich edit view and edit view . I have done some syntax coloring in the rich edit view. But the probelm is that when I use the keys ctrl-x and ctrl-v in edit view the program gives debug assertion failure sighting some error in the viewrich.cpp . Can anyone help me

Samir Sood

Samir Sood

BizTalk Mapper-like Rubberband Control available?

Uwe Keim9-May-02 23:18

Uwe Keim

9-May-02 23:18

Does anyone know, whether someone is selling a control to provide a rubberband to connect two trees, with junctions between the bands?

E.g. like on this image:

http://msdn.microsoft.com/library/en-us/dnbiz/html/biztalk_lesson5_2.gif

--
See me: www.magerquark.de

Thread Message

Hesham Amin9-May-02 23:02

Hesham Amin

9-May-02 23:02

Hi..
I write a miltithreaded MFC application so a worker thread

performs a lengthy operation.

I want the worker thread to notifty the UI thread when it

finishes the operation. So I use SendMessage()

function.

the code is something like this:

<br />
class CInfo  //to send arguments to the worker thread..<br />
{<br />
public:<br />
	HWND hwnd;<br />
//other class members..<br />
}<br />

In the dialog class :

<br />
//member variables:<br />
private:<br />
	CWinThread* m_pThread;<br />
	CInfo info;<br />
<br />
//a push button click event handler:<br />
void CMyDlg::OnStartWorkerBtn()<br />
{<br />
	info.hwnd=this->m_hWnd;<br />
	m_pThread=AfxBeginThread(CWorker::Work,&info,<br />
	THREAD_PRIORITY_NORMAL,0,CREATE_SUSPENDED);<br />
<br />
	m_pThread->m_bAutoDelete=FALSE;<br />
	m_pThread->ResumeThread();<br />
}<br />
<br />
//handler of the user message sent from worker thread:<br />
void CMyDlg::OnWorkerMessage()<br />
{<br />
	//perform some operations int the UI..<br />
}<br />

The worker thread code:

<br />
UINT CWorker::Work(void* arg)<br />
{<br />
	CInfo* info=(CInfo*)arg;<br />
	<br />
	// perform the lengthy operation:<br />
	/*<br />
	.....<br />
	*/<br />
	<br />
	SendMessage(info->hwnd,WM_USER+1,0,0);<br />
}<br />

The code works fine in the debug version but an ( Access

violation ) error occures in the release version when the UI

thread receives the message while dragging the window with the

mouse.

can any one help with that?

Re: Thread Message

jan larsen9-May-02 23:40

jan larsen

9-May-02 23:40

Have you tried PostMessage instead?, it does not look like you need your worker thread to be blocked anyway.
Here are the remarks for SendMessage:
"If the specified window was created by the calling thread, the window procedure is called immediately as a subroutine. If the specified window was created by a different thread, Windows switches to that thread and calls the appropriate window procedure.
"
As to why this should be a problem?, i guess that is between God and Gates...

"It could have been worse, it could have been ME!"

Re: Thread Message

Hesham Amin10-May-02 1:58

Hesham Amin

10-May-02 1:58

thank you
but i do need to block the worker thread
any way the problem was solved

Re: Thread Message

Philip Patrick9-May-02 23:49

Philip Patrick

9-May-02 23:49

There are few problems that I see at the moment. First, don't use SendMessage betweem threads. It can lead to deadlocks. Use PostMessage or PostThreadMessage instead.

But your problem is not a deadlock, so this is only a suggestion.
I know that you HAVE to declare your custom messages handler function properly, because it can lead to such things like Access Violations in release versions. So I think this is your case. OnWorkerMessage should be full-declared, like this:

//in header file:
...
//}}AFX_MSG
afx_msg LRESULT OnWorkerMessage(WPARAM wParam, LPARAM lParam);

//in cpp. ON_MESSAGE should go after MFC messages:

//}}AFX_MSG_MAP
ON_MESSAGE(WM_USER+1, OnWorkerMessage)
....

LRESULT CMyDlg::OnWorkerMessage(WPARAM /* wParam */, LPARAM /* lParam */)
{
...
}

Uncomment wParam and lParam if you want to use them

Philip Patrick
Web-site: www.stpworks.com
"Two beer or not two beer?" Shakesbeer

Need Web-based database administrator? You already have it!

Re: Thread Message

Hesham Amin10-May-02 1:56

Hesham Amin

10-May-02 1:56

thank you Philip
it worked using SendMessage()
the problem was that I did not declare the function with parameters

thank you again

You are welcome

Philip Patrick10-May-02 3:20

Philip Patrick

10-May-02 3:20

You are welcome Smile | :)

If you want to go deep in the problems when switching from debug to release, here is a great article explaining why, what and how Smile | :)

http://www.codeproject.com/debug/survivereleasever.asp

Philip Patrick
Web-site: www.stpworks.com
"Two beer or not two beer?" Shakesbeer

Need Web-based database administrator? You already have it!

a simple c++ question about operator=

denkor9-May-02 22:55

denkor

9-May-02 22:55

Hello guys!
there is a class named CMyClass as follow
CMyclass:CObject
{
public:
int m_iCount,m_iIndex;
CMyclass();
void ~CMyclass();
}
and definations: CMyclass ma,mb;
and statements: ma.m_iCount=3;
ma.m_iIndex=2;
How can I use "mb=ma;"?
Should I overide operator= ? and how?
Any suggestion is appreciable .

I'm learning learning and learning.

Re: a simple c++ question about operator=

Maxwell Chen9-May-02 23:06

Maxwell Chen

9-May-02 23:06

I just wrote a non-MFC code (actually a console one) to demonstrate operator overloading for you ...

#include <iostreamᡊe9ac73-238b-46be-991d-0f050c37248d
using namespace std;

class Base
{
protected:
	static int _iIndex;
	static Base* _pAddress;

	int _iId;
	Base* _pPrev;

public:
	Base() {
		_iId = ++_iIndex;
		_pPrev = _pAddress;
		_pAddress = this;
	}

	Base& operator==(Base& ref) {
		ref._pPrev = this;
		return *this;
	}

	int Bomb() {
		cout << _iId << " -> ";
		_sleep(500);
		if(!_pPrev) {
			cout << "\nChain broken!\n";
			return 1;
		}
		return _pPrev->Bomb();
	}
};

int Base::_iIndex = 0;
Base* Base::_pAddress = 0;

int main()
{
	Base a[20];

	a[19] == a[0];
	return a[19].Bomb();
}

Maxwell Chen
People say "No news is good news". Then, no code is good code!?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.