Re: CreateProcess vs WinExec - C / C++ / MFC Discussion Boards

Dominik Reichl20-Feb-05 9:26

20-Feb-05 9:26

Hm.. Ok, now the hh.exe starts at least... Hh.exe is in my Windows directory, will it always be there? (under WinNT in WinNT directory?) Even if using the GetWindowsDirectory function, it's a dangerous assumption...

But now I get an error from the hh.exe: no command line was specified?!??!

Any more ideas?

Thanks and best regards
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: CreateProcess vs WinExec

Graham Bradshaw20-Feb-05 10:34

Graham Bradshaw

20-Feb-05 10:34

I don't think you are supposed to do it this way. See this MSDN link[^] for details of the HtmlHelp API call. The added benfit of this is that when the application that displayed the help closes, the help file itself also closes automatically.

Re: CreateProcess vs WinExec

Ryan Binns20-Feb-05 17:03

Ryan Binns

20-Feb-05 17:03

Graham Bradshaw wrote:
The added benfit of this is that when the application that displayed the help closes, the help file itself also closes automatically.

Benefit?! Personally, I hate this "feature" Mad | :mad:

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: CreateProcess vs WinExec

Dominik Reichl21-Feb-05 6:59

Dominik Reichl

21-Feb-05 6:59

I know that crappy HtmlHelp API function. I will definitively not use this; if the WinExec call wouldn't work the users would have bad luck and no help Smile | :)

Fortunately the WinExec method works... I was just wondering why the CreateProcess doesn't work...

Best regards
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: CreateProcess vs WinExec

Neville Franks20-Feb-05 12:39

Neville Franks

20-Feb-05 12:39

Dominik Reichl wrote:
Hm.. Ok, now the hh.exe starts at least... Hh.exe is in my Windows directory, will it always be there? (under WinNT in WinNT directory?) Even if using the GetWindowsDirectory function, it's a dangerous assumption...

Agreed. You need to follow the same rules as WinExec.

The directory from which the application loaded. 
The current directory. 
The Windows system directory. TheGetSystemDirectory function retrieves the path of this directory. 
The Windows directory. TheGetWindowsDirectory function retrieves the path of this directory. 
The directories listed in the PATH environment variable.

Dominik Reichl wrote:
But now I get an error from the hh.exe: no command line was specified?!??!

Does it work if you specify just the filename?

Neville Franks, Author of ED for Windows www.getsoft.com and Surfulater www.surfulater.com "Save what you Surf"

Re: CreateProcess vs WinExec

Dominik Reichl21-Feb-05 6:53

Dominik Reichl

21-Feb-05 6:53

Neville Franks wrote:
Does it work if you specify just the filename?

No, it doesn't. Exactly the same message appears.

Thanks and best regards
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: CreateProcess vs WinExec

David Crow21-Feb-05 4:20

David Crow

21-Feb-05 4:20

Neville Franks wrote:
From memory WinExec() is a wrapper around CreateProcess().

I read this same thing, too.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: CreateProcess vs WinExec

Blake Miller22-Feb-05 6:46

Blake Miller

22-Feb-05 6:46

Because, when you pass the command line, you usually have to include the full file path to the EXE as the first argument on the command line. Traditionally, argv[0] is the path to the program and ANY arguments after that are of interest, so, try this instead...

STARTUPINFO sui;PROCESS_INFORMATION pi;ZeroMemory(&sui, sizeof(STARTUPINFO); sui.cb = sizeof(STARTUPINFO);ZeroMemory(&pi, sizeof(PROCESS_INFORMATION);CreateProcess("hh.exe", "hh.exe MyHelpFile.chm::features.html", NULL, NULL, FALSE, 0, NULL, NULL, &sui, &pi);

Note that I ONLY typed in hh.exe at beginning of command line, you might actually need the FULL file path..

STARTUPINFO sui;
PROCESS_INFORMATION pi;
ZeroMemory(&sui, sizeof(STARTUPINFO);
sui.cb = sizeof(STARTUPINFO);
ZeroMemory(&pi, sizeof(PROCESS_INFORMATION);
CreateProcess("hh.exe", "<full path="" to="" hh.exe="" here=""> <full path="" to="" help="" file="" here="">::features.html", NULL, NULL, FALSE, 0, NULL, NULL, &sui, &pi);

See if that works...

Re: CreateProcess vs WinExec

Dominik Reichl22-Feb-05 8:25

Dominik Reichl

22-Feb-05 8:25

It works perfectly when I prepend the command-line a "hh.exe " and pass the full path to the executable as first parameter for CreateProcess.

Many thanks!!

Best regards,
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Minimize event

Deian20-Feb-05 6:13

Deian

20-Feb-05 6:13

Hello,

how do I get notified if the user is pressing the minimize button in dialog based app, so I can perform certain operation?

Thanks in advance,
D.

Re: Minimize event

Dominik Reichl20-Feb-05 6:57

Dominik Reichl

20-Feb-05 6:57

Implement your own OnSysCommand handler:

void CMyDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
    if(nID == SC_MINIMIZE)
    {
         // Do stuff
    }
    CDialog::OnSysCommand(nID, lParam);
}

Hope that helps, best regards
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: Minimize event

Deian20-Feb-05 7:07

Deian

20-Feb-05 7:07

Thanks

delay() function equivalent in VC++ 6.0 -- is there any?

ur_unholyness20-Feb-05 2:42

ur_unholyness

20-Feb-05 2:42

I am working on a graphics application where I draw an ellipse and I need to incorporate a little delay, then erase this ellipse and redraw it elsewhere. I was able to do it very easily in Turbo C using the delay() function. How do I implement this in VC++ 6.0?

log live the dEvIL

Re: delay() function equivalent in VC++ 6.0 -- is there any?

eli1502197920-Feb-05 3:57

eli15021979

20-Feb-05 3:57

you shuold use the Sleep() function.
it takes 1 parameter(DWORD) which is the time to sleep,in miliseconds.

Regards,
Eli

Dialog box on Toolbar Control

jw8120-Feb-05 1:58

jw81

20-Feb-05 1:58

I have set a dialog box on the toolbar. There is a Editbox with a Button on the dialog box. The Editbox supposed to get a value from the user and once the Button is pressed, the value will be transfered into a variable in CView. I added a CDialogBar variable m_pointDistro but since there is no class for the dialogbox, I dont know how to add this variable.

Editbox ID is IDC_NPOINTS. I selected new class of the Dialogbox as CView but I was forbided to do that. So the Dialogbox ended up as no class. I chose the Button and added a function called OnDistro().

void CProgramView::Distro() {

   CMainFrame* pMainFrame = (CMainFrame*)GetParentFrame();
   CEdit* pArray = (CEdit*)(pMainFrame->m_pointDistro.GetDlgItem(IDC_NPOINTS));
   .
   .
}

1) If I accidentally made the dialogbar has no class, how can i revert back?
2) The coding I used to get value from the dialogbox couldnt work. How can I fix it?

Thanks,

Random Numbers

Renjith Ramachandran19-Feb-05 20:38

Renjith Ramachandran

19-Feb-05 20:38

i want to generate some random numbers,
but with in a limit ( i.e i want to generate the random numbers with in 50) how can i do it by using the rand() ?

Thanks in advance

Ninety-eight percent of the thrill comes from knowing that the thing you designed works, and works almost the way you expected it would. If that happens, part of you is in that machine.

Re: Random Numbers

Kevin McFarlane20-Feb-05 0:05

Kevin McFarlane

20-Feb-05 0:05

Try

   // Seed the random-number generator with current time so that
   // the numbers will be different every time we run.

    srand( (unsigned)time( NULL ) ); // include <time.h> for this

for( int i = 0;  i < 20; i++ )
{
    int n = int (50 *  ( (double) rand() / RAND_MAX ));
    cout << n << "\n";
}

Typical output:

4
48
10
16
27
12
10
27
45
39
24
15
7
3
12
22
24
25
19
28

Kevin

Re: Random Numbers

Ryan Binns20-Feb-05 17:08

Ryan Binns

20-Feb-05 17:08

Kevin McFarlane wrote:
int n = int (50 * ( (double) rand() / RAND_MAX ));

Aaaah, finally someone else who knows the best way to use rand(). Most people just use the % operator, but statistically, using your approach leads to more randomness, as the rand() algorithm has the property that the higher-order bits are more random than the lower order bits.

Or did you just guess? Wink | ;)

Either way, well done Smile | :)

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: Random Numbers

Kevin McFarlane25-Feb-05 8:00

Kevin McFarlane

25-Feb-05 8:00

I just guessed. In fact I'd thought that eli15021979's % method was slicker! But you learn something new every day. Smile | :)

Kevin

Re: Random Numbers

Ryan Binns26-Feb-05 18:51

Ryan Binns

26-Feb-05 18:51

Kevin McFarlane wrote:
In fact I'd thought that eli15021979's % method was slicker!

It is Smile | :)

And it will be good enough most of the time, but technically you can do better without having to change an awful lot Wink | ;)

. In fact, if you use the method you originally posted, modifying it to work with floating-point numbers is relatively trivial - a lot easier than converting one using the modulo operator, since the modulo operator doesn't work for floating-point numbers, well not in C++ at least...

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: Random Numbers

eli1502197920-Feb-05 0:14

eli15021979

20-Feb-05 0:14

Hi,
try this:

srand( (unsigned)time( NULL ));
int num = rand()%50;

Regards,
Eli

Re: Random Numbers

Renjith Ramachandran20-Feb-05 0:56

Renjith Ramachandran

20-Feb-05 0:56

yeah great...thankyou

Ninety-eight percent of the thrill comes from knowing that the thing you designed works, and works almost the way you expected it would. If that happens, part of you is in that machine.

Re: Random Numbers

Kevin McFarlane20-Feb-05 4:39

Kevin McFarlane

20-Feb-05 4:39

Of course! Much simpler than mine!

Kevin

Re: Random Numbers

nadzzz20-Feb-05 7:22

nadzzz

20-Feb-05 7:22

use the modulo (%)

//0 to 49
int nNumber = (rand() % 50);
//1 to 50
int nNumber between1and50 = 1 + (rand() % 50);

Re: Random Numbers

David Crow21-Feb-05 4:24

David Crow

21-Feb-05 4:24

renjith_sree wrote:
i want to generate some random numbers,

Unfortunately this is impossible using a computer algorithm. The best you can hope for is a pseudo-random number.

renjith_sree wrote:
but with in a limit ( i.e i want to generate the random numbers with in 50)...

Is 50 the upper limit or the lower limit?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

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