showing countdown when AddTimer() is working - C / C++ / MFC Discussion Boards

David Crow8-Jun-07 4:12

8-Jun-07 4:12

Software_Specialist wrote:
CString strFilter;
const TCHAR *strSource= _T("All Files (*.*)|*.*||");
_tcscpy_s(strFilter, strSource);

How is this not generating a compiler error? I would have expected it to be:

_tcscpy_s(strFilter.GetBuffer(128), strSource);

In any case, why would you want to use _tcscpy_s() with a CString object? That makes no sense.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: error C2664 in MFC..?

Software_Specialist8-Jun-07 4:18

Software_Specialist

8-Jun-07 4:18

Sorry... my brain is nt workin enough nw....need lil break..
actually it was

TCHAR strFilter[1000];
const TCHAR *strSource=_T("All Files(*.*)|*.*||");
_tcscpy_s(strFilter, strSource);

And this was definately working....i tested it aswell

Rest ill find out after i finish writing these functions ....hoping for the best... Smile | :)

Re: error C2664 in MFC..?

David Crow8-Jun-07 4:26

David Crow

8-Jun-07 4:26

Software_Specialist wrote:
TCHAR strFilter[1000];
const TCHAR *strSource=_T("All Files(*.*)|*.*||");
_tcscpy_s(strFilter, strSource);

So why introduce an unnecessary variable (i.e., strSource) when

TCHAR strFilter[1000];
_tcscpy_s(strFilter, _T("All Files(*.*)|*.*||"));

would have sufficed? Since you are using MFC, why bother with wchar_t variables at all?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: error C2664 in MFC..?

Software_Specialist8-Jun-07 4:47

Software_Specialist

8-Jun-07 4:47

may be u are right...But i tried that way but it was not working ..yeh i didnt included _T at that time...So ill check out if it works without const TCHAR variable...
Thanks for pointing me out...

Re: error C2664 in MFC..?

Software_Specialist8-Jun-07 3:38

Software_Specialist

8-Jun-07 3:38

i guess i got some cause due to which its giving me these error...ill make those changes n will see if it works or not...
i would post wtever i get in a bit...

Re: error C2664 in MFC..?

Rajkumar R8-Jun-07 3:41

Rajkumar R

8-Jun-07 3:41

Hi,
These errors or not due to TCHAR or wifstream. Have you included the file with the definition for hide_in_text::hide_file, secret_file_class::get_secret_file, ...

I think the definition for these are missing.

Best Regards
Raj

Re: error C2664 in MFC..?

Software_Specialist8-Jun-07 3:49

Software_Specialist

8-Jun-07 3:49

Yeh you are right...thats what i am doing now.. declaration was missing...by mistake it got deleted...
I am rewriting those 2 functions now.....ill update whatever i get by the end...

Thanks a lot for all your help...

showing countdown when AddTimer() is working

neha.agarwal278-Jun-07 1:01

neha.agarwal27

8-Jun-07 1:01

Hello all,

I have used AddTimer() function in my application like this

AddTimer(test_interval);
<\pre>

i want to show count down in my application. for example if i have set time as 1 min then it should show 60,59.58.......

how to do this? Because i have seen while debugging the application no where remaining time is shown ....

Can anybody help me in this

thanks in advance

Re: showing countdown when AddTimer() is working

Clebson Derivan8-Jun-07 1:25

Clebson Derivan

8-Jun-07 1:25

do you wrote this function ? is your application console or windows ?

Re: showing countdown when AddTimer() is working

neha.agarwal278-Jun-07 1:34

neha.agarwal27

8-Jun-07 1:34

i have made a windows application. yes the code is written by me but
AddTimer() is API given...

Re: showing countdown when AddTimer() is working

Clebson Derivan8-Jun-07 2:13

Clebson Derivan

8-Jun-07 2:13

Sorry for the questions, I have searched in MSDN and cannot find this AddTimer API so I don't know what it does. BTW as you are using windows you can use SetTimer API and handle the WM_TIMER message. you can set a one second time interval and decrement a member variable ex:

<br />
m_nCountDown = 60;<br />
SetTimer(hwnd, 1, 1000, (TIMERPROC) NULL);<br />
//...<br />
case WM_TIMER: <br />
   TRACE("%d\n", --m_nCountDown);<br />
   if(m_nCountDown == 0) KillTimer(hwnd, 1); <br />

Re: showing countdown when AddTimer() is working

neha.agarwal278-Jun-07 2:51

neha.agarwal27

8-Jun-07 2:51

yes i m sorry i have used SetTimer function only.....Can you please elaborate this example of yours because i am not getting exactly how to implement this. If there is any source code then it'll be of great help....

Re: showing countdown when AddTimer() is working

David Crow8-Jun-07 3:02

David Crow

8-Jun-07 3:02

neha.agarwal27 wrote:
If there is any source code then it'll be of great help....

It's more than plentiful. Google for it, or search here at CP.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: showing countdown when AddTimer() is working

Clebson Derivan8-Jun-07 3:14

Clebson Derivan

8-Jun-07 3:14

take a look:

<br />
#include <stdio.h><br />
#include <windows.h> <br />
#pragma comment(lib, "user32.lib")<br />
<br />
// Global Variables: <br />
HINSTANCE hInst; <br />
TCHAR szTitle[] = "timer sample"; <br />
TCHAR szWindowClass[] = "timersampleapp"; <br />
int	nCountDown = 0;<br />
<br />
<br />
// Forward declarations of functions included in this code module: <br />
BOOL InitInstance(HINSTANCE, int); <br />
void ErrorExit(LPTSTR lpszFunction); <br />
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); <br />
<br />
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) <br />
{ <br />
	UNREFERENCED_PARAMETER(hPrevInstance); <br />
	UNREFERENCED_PARAMETER(lpCmdLine); <br />
<br />
	MSG msg; <br />
	WNDCLASSEX wcex; <br />
<br />
	wcex.cbSize = sizeof(WNDCLASSEX); <br />
	wcex.style = CS_HREDRAW | CS_VREDRAW; <br />
	wcex.lpfnWndProc = WndProc; <br />
	wcex.cbClsExtra = 0; <br />
	wcex.cbWndExtra = 0; <br />
	wcex.hInstance = hInstance; <br />
	wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION); <br />
	wcex.hCursor = LoadCursor(NULL, IDC_ARROW); <br />
	wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); <br />
	wcex.lpszMenuName = NULL; <br />
	wcex.lpszClassName = szWindowClass; <br />
	wcex.hIconSm = (HICON)LoadImage(hInstance, MAKEINTRESOURCE(5), IMAGE_ICON, <br />
		GetSystemMetrics(SM_CXSMICON), GetSystemMetrics(SM_CYSMICON), LR_DEFAULTCOLOR); <br />
<br />
	if (RegisterClassEx(&wcex) == 0) <br />
	{ <br />
		ErrorExit("RegisterClassEx"); <br />
		return FALSE; <br />
	} <br />
<br />
<br />
	if (!InitInstance (hInstance, nCmdShow)) <br />
	{ <br />
		ErrorExit("InitInstance"); <br />
		return FALSE; <br />
	} <br />
<br />
	while (GetMessage(&msg, NULL, 0, 0)) <br />
	{ <br />
		TranslateMessage(&msg); <br />
		DispatchMessage(&msg); <br />
	} <br />
<br />
	return (int) msg.wParam; <br />
} <br />
<br />
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) <br />
{ <br />
	HWND hWnd; <br />
	hInst = hInstance; <br />
<br />
	hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW, <br />
		CW_USEDEFAULT, 0, 640, 480, NULL, NULL, hInstance, NULL); <br />
<br />
	if (!hWnd) <br />
	{ <br />
		return FALSE; <br />
	} <br />
<br />
	nCountDown = 60;<br />
	SetTimer(hWnd, 1, 1000, (TIMERPROC) NULL);<br />
<br />
	ShowWindow(hWnd, nCmdShow); <br />
	UpdateWindow(hWnd); <br />
<br />
	return TRUE; <br />
} <br />
<br />
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) <br />
{ <br />
	PAINTSTRUCT ps; <br />
	HDC hdc; <br />
<br />
	switch (message) <br />
	{ <br />
	case WM_TIMER:<br />
<br />
		--nCountDown;<br />
		if(nCountDown == 0) <br />
			KillTimer(hWnd, 1);<br />
		else<br />
		{<br />
			TCHAR msg[20] = {0};<br />
			sprintf(msg, "%d", nCountDown);<br />
			SetWindowText(hWnd, msg);<br />
		}<br />
<br />
		break;<br />
	case WM_PAINT: <br />
		hdc = BeginPaint(hWnd, &ps); <br />
		// TODO: Add any drawing code here... <br />
		EndPaint(hWnd, &ps); <br />
		break; <br />
	case WM_DESTROY: <br />
		PostQuitMessage(0); <br />
		break; <br />
	default: <br />
		return DefWindowProc(hWnd, message, wParam, lParam); <br />
	} <br />
	return 0; <br />
} <br />
<br />
void ErrorExit(LPTSTR lpszFunction) <br />
{ <br />
	TCHAR szBuf[80]; <br />
	LPVOID lpMsgBuf; <br />
	DWORD dw = GetLastError(); <br />
<br />
	FormatMessage( <br />
		FORMAT_MESSAGE_ALLOCATE_BUFFER | <br />
		FORMAT_MESSAGE_FROM_SYSTEM, <br />
		NULL, <br />
		dw, <br />
		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), <br />
		(LPTSTR) &lpMsgBuf, <br />
		0, NULL ); <br />
<br />
	wsprintf(szBuf, <br />
		"%s failed with error %d: %s", <br />
		lpszFunction, dw, lpMsgBuf); <br />
<br />
	MessageBox(NULL, szBuf, "Error", MB_OK); <br />
	LocalFree(lpMsgBuf); <br />
} <br />

Re: showing countdown when AddTimer() is working

pierre_ribery8-Jun-07 11:38

pierre_ribery

8-Jun-07 11:38

This is not the recommended way of doing a countdown using timers. The correct approach is to use the current time to do the countdown.

For instance when the countdown should start the current time is: 04:00:00.
If you want a 1 minute countdown you set the End time to 04:01:00.

Then you set up a timer with the interval set to 1000ms. In the WM_TIMER handler you get the current time and calculates the time remaining.

The reason that it is wrong to decrement by 1 sec each time the WM_TIMER handler get called is that there is no guarantee that the handler will be handled after 1sec. Only guarantee is that it will not happen before 1 sec. Might not be that big deal in this case, but it is good habbit to do it correct way!

DEBUG mode ERROR

vivekphlp8-Jun-07 0:56

vivekphlp

8-Jun-07 0:56

i have two modes in my application - ONLINE, OFFLINE
WHen i run my program in DEBUG MODE and change my application from ONLINE to OFFLINE mode i get an error-

" THE EXCEPTION BREAKPOINT"
ABreak point has been reached.
(0x80000003) occured in the application at location 0x7c901230
But when running in RELEASE MODE , its running fine..
why is it so

Proud To Be an Indian

Re: DEBUG mode ERROR

prasad_som8-Jun-07 2:40

prasad_som

8-Jun-07 2:40

vivekphlp wrote:
ABreak point has been reached.

And what does call stack tell you ?

Prasad
MS MVP - VC++

Re: DEBUG mode ERROR

David Crow8-Jun-07 2:53

David Crow

8-Jun-07 2:53

What happens when you set a breakpoint in the routine that handles the changing from ONLINE to OFFLINE, and single-step from that point?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: DEBUG mode ERROR

vivekphlp8-Jun-07 3:23

vivekphlp

8-Jun-07 3:23

THe stack says - NTDLL! 7c901230() here the error comes

When i put breakpoint it comes to a function call and then a error msg pops out User Exception at xxxxxxx.

Proud To Be an Indian

Re: DEBUG mode ERROR

David Crow8-Jun-07 3:24

David Crow

8-Jun-07 3:24

vivekphlp wrote:
When i put breakpoint it comes to a function call and then a error msg pops out User Exception at xxxxxxx.

So are you going to tell us what that function call is?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: DEBUG mode ERROR

vivekphlp8-Jun-07 3:26

vivekphlp

8-Jun-07 3:26

its a user defined function ....

Proud To Be an Indian

failed to install vc6.0

aren3728-Jun-07 0:32

aren372

8-Jun-07 0:32

hi,everyone
I'm failed to install vc6.0
an error occured while I'm installing vc6.0:
error messagebox title: error while configuring ODBC drivers
error information: odbc's sqlInstallDriverManager failed.
who help me?

Re: failed to install vc6.0

David Crow8-Jun-07 2:54

David Crow

8-Jun-07 2:54

If you do not need that specific driver, just opt to not install it.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: failed to install vc6.0

aren37211-Jun-07 21:57

aren372

11-Jun-07 21:57

Thanks for your help,but I need it.
It seems no solution to this problem...
Finally I had to reinstall windows...

Re: failed to install vc6.0

David Crow12-Jun-07 2:27

David Crow

12-Jun-07 2:27

aren372 wrote:
Finally I had to reinstall windows...

So you're up and running then?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

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