C / C++ / MFC Discussion Boards

Dragonalex6-Jun-07 5:59

6-Jun-07 5:59

Ok, rember me? The novice who is working on an assignment for school?

Well, you guys were so helpfull last tiem, I decided to return.

How do you start/stop a timer useing a button?

Re: Project part two.

Cyrilix6-Jun-07 6:08

Cyrilix

6-Jun-07 6:08

Interface a GUI to the QueryPerformanceCounter API.

Re: Project part two.

Mark Salsbery6-Jun-07 6:11

Mark Salsbery

6-Jun-07 6:11

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: Project part two.

Cyrilix6-Jun-07 10:03

Cyrilix

6-Jun-07 10:03

Am I missing something? If my suggestion is a really bad one, which it may be, then please tell me why.

Re: Project part two.

Mark Salsbery6-Jun-07 10:28

Mark Salsbery

6-Jun-07 10:28

Just my first reaction. I don't have the CodeProject mind-reading unit yet.
Of all the possibilities for what kind of timer the OP wanted, that was probably the hardest
for a novice to understand. Smile | :)

I guess you knew what (s)he wanted.

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: Project part two.

Cyrilix6-Jun-07 10:35

Cyrilix

6-Jun-07 10:35

Hmm... that's the only way I know how to work a timer, aside from GetTickCount(), but that button click event sounds like a good way too -- I didn't know about it. Smile | :)

Re: Project part two.

Mark Salsbery6-Jun-07 12:48

Mark Salsbery

6-Jun-07 12:48

The first timers I think of are multimedia one-shot/periodic timers or the window timers
created with SetTimer().

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: Project part two.

Dragonalex6-Jun-07 6:23

Dragonalex

6-Jun-07 6:23

A c++ timer. I have NO idea what you just said =/

Re: Project part two.

Mark Salsbery6-Jun-07 6:39

Mark Salsbery

6-Jun-07 6:39

What kind of timer do you need?

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: Project part two.

daveyerwin6-Jun-07 6:44

daveyerwin

6-Jun-07 6:44

http://www.codeproject.com/cpp/precision_timer.asp?df=100&forumid=231454&exp=0&select=1281885[^]

Re: Project part two.

jhwurmbach6-Jun-07 6:50

jhwurmbach

6-Jun-07 6:50

You have a handler for button clicks.
In that you use SetTimer() to get your timer running.

Windows will call your OnTimer() function.
There you do whatever needs to be done.

Now you should have more than enough to look up!

Failure is not an option - it's built right in.

Re: Project part two.

Reagan Conservative6-Jun-07 6:43

Reagan Conservative

6-Jun-07 6:43

I'll be nice and get you started, but you figure out the rest --- that's why you're in school, to use your brain.

Create a new member function like OnStartTimeButton(). Then you create the stuff that goes into that function. Like keep a counter or some variable to check each time to either start the time or stop the time. Enough said.

John P.

Re: Project part two.

Mark Salsbery6-Jun-07 7:05

Mark Salsbery

6-Jun-07 7:05

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Downconverting froma 32-bit bitmap to a 4-bit bitmap

TheDelChop6-Jun-07 5:48

TheDelChop

6-Jun-07 5:48

I am trying to create a 4-bit bitmap from a 32-bit bitmap. Obviously this demands some sort of downcoversion from the 32-bit pixel values to the 4-bit values. I call GetDIBits with a PBITMIPINFO that is a 4-bit bitmap with a 16 color table. GetDIBits will do the downcoversion for me automatically right?

Re: Downconverting froma 32-bit bitmap to a 4-bit bitmap

Mark Salsbery6-Jun-07 6:10

Mark Salsbery

6-Jun-07 6:10

TheDelChop wrote:
GetDIBits will do the downcoversion for me automatically right?

Yes.

I believe it creates the color table for you as well (based on the standard VGA palette according to the docs).

This article may or may not help: How To Convert Between Device-Dependent Bitmaps and DIBs[^]

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

invoke app

Try6-Jun-07 5:29

Try

6-Jun-07 5:29

Hi all,

I have developed an VC++ (VS2005) application. It has a button on the form. When i click on the button, it executes another application using CreateProcess() and another window (application) pops up infront of the parent window. Parent waits (i am using WaitForSingleObject).
The problem is, if i click on the parent window, it shows "Not Responding" message. Here i am able click on parent window, but parent doesn't respond and shows white screen.
Can anyone please tell me how to disable the parent window until i click OK or Cancel of second window? It should be a kind of "Modal".
Is it possible?
Thank u.

Re: invoke app

Mark Salsbery6-Jun-07 5:57

Mark Salsbery

6-Jun-07 5:57

Basically, you could do this:

EnableWindow(hwndMain, FALSE);
...wait for other app
EnableWindow(hwndMain, TRUE);

Using WaitForSingleObject() is halting all window message processing in your app, which is why
to the system, it's not responding. It's also not going to update its UI if you move other
windows over it.

To get around this, you may want to change the design a bit, something like:

1) Disable the main window
2) Start a second thread which launches the second app and waits
3) When wait completes on the second thread, post a message to the main window.
4) When the main window receives the message, enable the main window

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: invoke app

Stephen Hewitt6-Jun-07 18:18

Stephen Hewitt

6-Jun-07 18:18

Mark Salsbery wrote:
Using WaitForSingleObject() is halting all window message processing in your app, which is why
to the system, it's not responding. It's also not going to update its UI if you move other
windows over it.

That's where the MsgWaitForMultipleObjects API comes in handy. An example usage can be seen in ATL's AtlWaitWithMessageLoop function or you can use this ATL function directly.

Steve

Re: invoke app

Mark Salsbery7-Jun-07 4:43

Mark Salsbery

7-Jun-07 4:43

Cool Steve!

I've never used MsgWaitForMultipleObjects(). Maybe I should take the time to go through the
list of synchronization functions and explore them thoroughly for gems.

Thanks for pointing that out!
Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

PDF

S Douglas6-Jun-07 4:50

S Douglas

6-Jun-07 4:50

Anyone know of any classes or even a program that will convert pdf documents to html, preferably preserving as much of the formatting as possible?

I'm not really fussy about what language, but prefer something C++

Re: PDF

Hamid_RT6-Jun-07 5:04

Hamid_RT

6-Jun-07 5:04

Does this[^] link helpful?

WhiteSky

Re: PDF

S Douglas6-Jun-07 7:31

S Douglas

6-Jun-07 7:31

Thanks whitesky, but I need it to go the other way PDF to HTML. That looks like it only creates PDF.

Why did the function PfAddFiltersToInterface always failed?

yzzm6-Jun-07 4:49

yzzm

6-Jun-07 4:49

The goal of my code is to filter some specific IP packet,just like the firewall.But one of the function in my code was always failed.The error code is 87(error parameter).I really don't known where goes wrong.I was puzzled of this problem.Any help is much appreciated.

<code>#include "stdio.h"
#include "windows.h"
#include "Fltdefs.h"

#pragma comment(lib, "iphlpapi.lib")

void main(int argc, char* argv[])
{
DWORD err = NO_ERROR;
// Create a filter interface
INTERFACE_HANDLE hInterface;
PfCreateInterface(
0,
PF_ACTION_FORWARD,//PF_ACTION_DROP,
PF_ACTION_FORWARD,//PF_ACTION_DROP,
FALSE,
TRUE,
&hInterface);

// Bind the filter interface to a IP
BYTE localIp[] = {192,168,0,111};
BYTE remoteIp[] = {220,181,38,4};
PfBindInterfaceToIPAddress(hInterface, PF_IPV4, localIp);

FILTER_HANDLE fHandle;
// Fill the filter struct
PF_FILTER_DESCRIPTOR outFilter;
outFilter.dwFilterFlags = FD_FLAGS_NOSYN; always use this
outFilter.dwRule = 0; //always use this
outFilter.pfatType = PF_IPV4;
outFilter.SrcAddr = localIp;
outFilter.SrcMask = (PBYTE)"\xFF\xFF\xFF\x0";
outFilter.wSrcPort = FILTER_TCPUDP_PORT_ANY; outFilter.wSrcPortHighRange = FILTER_TCPUDP_PORT_ANY;
outFilter.DstAddr = 0;
outFilter.DstMask = 0;
outFilter.wDstPort = 1;
outFilter.wDstPortHighRange = 10000;
outFilter.fLateBound = LB_SRC_ADDR_USE_DSTADDR_FLAG|LB_DST_ADDR_USE_DSTADDR_FLAG;
outFilter.dwProtocol = FILTER_PROTO_ANY;
err = PfAddFiltersToInterface(hInterface, 0, NULL,1, &outFilter, &fHandle);
//PfAddFiltersToInterface always failed
if(err != NO_ERROR)
{
int exitcode = GetLastError();
printf("PfAddFiltersToInterface is Wrong\n");
printf("The error exit code is %d\n", exitcode);
//return ;
}

printf("Try to connect to the internet...\n");
char ch=getchar();
printf("Filter Enabled!");
// Remove the filter interface
PfRemoveFilterHandles(hInterface, 1, &fHandle);
PfUnBindInterface(hInterface);
PfDeleteInterface(hInterface);

return;
} </code>

ios ????

Software_Specialist6-Jun-07 4:43

Software_Specialist

6-Jun-07 4:43

Hi i am rewriting a piece of MFC(vc++6)code in VS2005 (MFC).

There is a code as shown below..

<br />
ofstream file;<br />
file.open("abc.seg", ios::out|ios::binary);<br />

Is this code wrong. Well as no intellisence IS coming up for ios in this and even in msnd i could not find any info about ios::out and ios::binary..
I guess there must be some changes in the same. Well though i am not getting error at the moment. I can build it. What coudl be the reason...???

So could any one shed some light over it and also what exactly that parameter is doing....

Thanks
SS

Re: ios ????

David Crow6-Jun-07 4:56

David Crow

6-Jun-07 4:56

Software_Specialist wrote:
...in msnd i could not find any info about ios::out and ios::binary..

Why not? It's all right here.

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