C / C++ / MFC

How to delay about 1/20 milisecond ?

2-Jan-06 18:08

There are notification messages for this purpose.

Suppose you wanna handle selection change event then do this. (Write this in the parent window)

ON_NOTIFY_REFLECT(TVN_SELCHANGED, OnNotifySelChange)

in .h file

afx_msg void OnNotifySelChange(NMHDR* pNm, LRESULT *pRes);

in .cpp file

void CYouparentClass::OnNotifySelChange(NMHDR* pNm , LRESULT *pRes)
{
   LPNMTREEVIEW pNMTreeView = reinterpret_cast<LPNMTREEVIEW>(pNMHDR);
   //this will be the event handler for selection changes of the treectrl
   //you can use SetButtonInfo here
}

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quangpk2-Jan-06 1:43

quangpk

2-Jan-06 1:43

I want to create a time delay about 1/20 milisecond.

kakan2-Jan-06 3:18

kakan

2-Jan-06 3:18

You can use QueryPerformanceCounter().

babuprasath2-Jan-06 4:01

babuprasath

2-Jan-06 4:01

hai do u know assmbly language.
if u know 8086 assm lan Easily you can create a time delay

nde_plume2-Jan-06 6:02

nde_plume

2-Jan-06 6:02

You probably can't reliably without going to extrodinary means. This is because Windows is not a Real time operating system, and at any stage your process could be preempted. However, the closest you can get is by calling

::Sleep(20)

In reality this will sleep more than twenty milliseconds quite often, because it relinquishes your timeslice in the process scheduler, but it is the best you can do without doing something really hard.

Despite what my mis-spelling co-poster tells you, going to assembly language will not offer you any benefit over the above, because it is no less subject to pre-emption than anything else. He/she might argue that you do not relinquish your timeslice as above, however the same can be accomplished in C++ too.

For example:

class Timer
{
public:
Timer();
void wait(DWORD ms);
private:
static int cyclesPerMs; // Number of loop iterations per millisecond
};

int Timer::cyclesPerMs = -1;

Timer::Timer()
{
const CALIBRATION_TICKS = 100000;
if(cyclesPerMs == -1)
{
// Calibrate timer
clock_t start = clock();
for(int i=0; i

How to change parents Text prperty label from child dialog box

Alexander ^M.,3-Jan-06 7:43

Alexander ^M.,

3-Jan-06 7:43

What do you need the delay for?

Don't try it, just do it! Wink | ;-)

RamL2-Jan-06 0:54

Re: How to change parents Text prperty label from child dialog box

2-Jan-06 0:54

Hi,

My query is MFC related to Dialog box.

I want to change the Text property label of parent dialog box from its child dialog file.

How to change Text lable of parent dialog box from its child dialog file?

Thanks in advance

-Ramesh.

Owner drawn2-Jan-06 0:57

Re: How to change parents Text prperty label from child dialog box

2-Jan-06 0:57

Use GetParent() from the Child Dialog.

GetParent()->SetWindowText("New title"); Big Grin | :-D

Jesus Loves You and Me Smile | :)

RamL2-Jan-06 1:04

Re: How to change parents Text prperty label from child dialog box

2-Jan-06 1:04

Thanks,

But how to specify the Parents perticular Text property ID to change its lable from its child dialog file.

-Ramesh

Owner drawn2-Jan-06 1:07

Re: How to change parents Text prperty label from child dialog box

2-Jan-06 1:07

Didn't get you. Be more clear. May be an illustration would do.

Jesus Loves You and Me Smile | :)

RamL2-Jan-06 1:14

Re: How to change parents Text prperty label from child dialog box

2-Jan-06 1:14

I have a Text control on parent dialog box its ID is say IDC_TEXT1 & its Caption is "MY NAME". I want to change its caption from its another child dialog box file. When I click on child TAB page then parent IDC_TEXT1 caption should change to "NEW NAME".

Thanks
-Ramesh

Owner drawn2-Jan-06 1:28

Re: How to change parents Text prperty label from child dialog box

2-Jan-06 1:28

((CYourDialogClass*)GetParent())->GetDlgItem(IDC_TEXT1)->SetWindowText("NEW NAME");

Jesus Loves You and Me Smile | :)

RamL2-Jan-06 1:44

Re: How to change parents Text prperty label from child dialog box

2-Jan-06 1:44

Thanks
I have already tried that, but Child dialog box file not getting patent Text ID

Is it possible to use Notification message from child to parent to change the parent Text property caption.

If it is possible, Please let me know.

Prakash Nadar2-Jan-06 3:21

Prakash Nadar

2-Jan-06 3:21

Is the child dialog a model dialog or modeless dialog ?

If its a modeless, did you pass the the parent window to the modeless dialog ?

-Prakash

Re: How to change parents Text prperty label from child dialog box

RamL2-Jan-06 19:00

How to read value at address 0000:0408 ?

2-Jan-06 19:00

It is Modal dialog box.

ya, I have passed the parent window to the modeless dialog

Thanks

-Ramesh

quangpk1-Jan-06 23:23

quangpk

1-Jan-06 23:23

I want to read value of address 0000:0408 to check port LPT1. But there is error when I run this program.
How to read value of that address ?

kakan2-Jan-06 3:04

kakan

2-Jan-06 3:04

Since noone else answers, I feel I have to.

The answer is very simple: You don't!
That's because all NT-versions of Windows (including i.e. Win2k, XP) doesn't allow processes (like programs) to access hardware directly.
In the old DOS-based Windows-versions (up to Me), it was all right.

There is a utlitity (available in several versions) called inpout32. Maybe you could use one of them? Search with Google for inpout32.

Kakan

Prakash Nadar2-Jan-06 3:23

Prakash Nadar

2-Jan-06 3:23

kakan wrote:
There is a utlitity (available in several versions) called inpout32. Maybe you could use one of them? Search with Google for inpout32.

I think they worked with win16 only and does not work with WinNT onwards.

-Prakash

kakan2-Jan-06 3:28

kakan

2-Jan-06 3:28

I made a quick Google search before I posted my answer, and found a couple of versions that did execute under XP too.
I'm not sure if they work or not, but it seems as if they do.

For instance, this:
http://www.logix4u.net/inpout32.htm[^]

And this:
http://www.programmersheaven.com/zone15/cat610/28409.htm[^]

Kakan.

Difference between CToolbar and CDialogBar

Prakash Nadar2-Jan-06 3:25

Prakash Nadar

2-Jan-06 3:25

even if you are able to access the memory address, probably you wont get what you are looking for.

What is that you want to do with LPT1, check CreateFile(...) windows api. You can create a handle to that port and do what you want to do with it.

-Prakash

Identity Undisclosed1-Jan-06 22:56

Identity Undisclosed

1-Jan-06 22:56

Whats the major difference between CToolbar and CDialogBar ? .. Any fast help ???

Re: Difference between CToolbar and CDialogBar

Owner drawn1-Jan-06 22:59