Send F5 or left arrow message - C / C++ / MFC Discussion Boards

Blue Pyre17-Mar-04 11:38

17-Mar-04 11:38

Ok i've converted the string to an int, but its not working as I planned..

What i've done is created a few buttons for a calculator.
Theres a string, and every time you click on a button a value is added to the end of the string. For example if you click a button with 5 on it, the code would be StringOutcome += "5".
I thought you may be able to do things like addition as well, so if you pressed 9 then + then 4, StringOutcome would be "9+4". If, in turn you converted this to an int it should see it as 9+4, therefore as 11. Only problem is that its not working like that... Its just displaying the first number you press.

Can anyone shed light on what is happening, and any kind of way around it?

Re: Converting a CString to CInt

Prakash Nadar17-Mar-04 14:55

Prakash Nadar

17-Mar-04 14:55

Blue Pyre wrote:
If, in turn you converted this to an int it should see it as 9+4, therefore as 11. Only problem is that its not working like that

its not a problem, it will not work like that... Its a logic error. When the user clicks on +,-,/ or * you convert the string and store it in another variable and the operation to be performed like +,-,etc then take the second no also from the user. Now add/sub/mul/div the two no.

basically you need 2 seperate inputs and one operation input.

MSN Messenger.
prakashnadar@msn.com

Re: Converting a CString to CInt

MeterMan17-Mar-04 14:57

MeterMan

17-Mar-04 14:57

Just curious why are you using a string to begin with when your dealing with Integers? What I would do is this

you have your buttons number0-number9.

I would make an edit box which I assume you have done and give it a control variable of m_outvalue of type CEdit.

Also make you some variables:
bool minus; // true or false for minus button pushed
bool plus; // true or false for plus button pushed
int m_total; // integer value to hold the calculated value

Then click on the button say button 1 and it will make OnButton1();

void CCalculatorDlg::Onnumber1()
{
if (!minus && !plus)
m_total=1; // if neither the plus or the minus is pressed you add 1

if (plus)
{
m_total=m_total+1; // if plus was pressed add one to total
plus=false; // set the bool back to false

}
if (minus)
{
m_total=m_total-1; // if minus was pressed deduct one from total
minus=false; // set the bool back to false

}
CString TempString; // your temp string holder
TempString.Format("%d",m_total); // converts int to string
m_outvalue.SetWindowText(TempString); // outputs string to edit box
}

void CCalculatorDlg::Onplus()
{
plus=true; // turn the plus bool on for addition

m_outvalue.SetWindowText("+"); // display the plus sign in your edit box
}

void CCalculatorDlg::Onminus()
{
minus=true; // turn the minus bool on for subtraction

m_outvalue.SetWindowText("-"); // display the minus sign in your edit box
}

void CCalculatorDlg::Onnumber2()
{
if(!minus && !plus)
m_total=2; // if the minus or plus is not pressed make total 2

if (plus)
{
m_total=m_total+2; // if plus was pressed add two to the value
plus=false; // set plus bool to false
}

if (minus)
{
m_total=m_total-2; // if minus was pressed deduct two from value
minus=false; // set the minus bool to false
}
CString TempString; // temp string holder
TempString.Format("%d",m_total); // convert int to a string
m_outvalue.SetWindowText(TempString); // display string in edit box
}

void CCalculatorDlg::Onequals()
{
CString TempString; // temp holder for string
TempString.Format("%d",m_total); // convert int to a string
m_outvalue.SetWindowText(TempString); // display string in edit box

}

I hope this helps you.

Win32newb
"Making windows programs worse than they already are"

C++ .NET Forms Shutdown application

Neoankt17-Mar-04 6:09

Neoankt

17-Mar-04 6:09

I have a question...
Im trying to develop a application but there one thing thats confusing me
How do you develop a application that uses windows forms in C++ .NET that will shutdown you computer?

Re: C++ .NET Forms Shutdown application

Antti Keskinen17-Mar-04 7:05

Antti Keskinen

17-Mar-04 7:05

See this[^] article, from the relevant parts. Refer to the source code for an example how to shut down a Windows OS.

If you are allowed to call unmanaged functions, use ExitWindowsEx in the Platform API. This will shut down Windows.

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

Need a Good COM Tutorial !!!

HAHAHA_NEXT17-Mar-04 6:06

HAHAHA_NEXT

17-Mar-04 6:06

Hi ppl.

I have this c++ class and i want to make it available to my vb app.
I need a good COM tutorial. (Net is full of CRAP).
All methods in my class are static.

Thx.

Secondary display dimension winxp

Bernardo Faria17-Mar-04 6:04

Bernardo Faria

17-Mar-04 6:04

How can I get the dimension of the secondary display in windows xp?
GetSystemMetrics(SM_CXSCREEN) and GetSystemMetrics(SM_CYSCREEN) give me the primary screen dimension, but there is no way I can get the secondary display with GetSystemMetrics.

I can get all the virtual display dimension with SM_CXVIRTUALSCREEN and SM_CYVIRTUALSCREEN parameters, but this do not solve my problem.

Any tips? Confused | :confused:

Regards

Bernardo Faria Smile | :)

Send F5 or left arrow message

Tomaz Rotovnik17-Mar-04 5:33

Tomaz Rotovnik

17-Mar-04 5:33

Hi
What is correct procedure for sending F5 key or left arrow key?

SendMesage(hwnd,WM_CHAR,?,?) or SendMesage(hwnd,WM_KEYDOWN,?,?)

Tomaz Rotovnik

Re: Send F5 or left arrow message

gUrM33T17-Mar-04 14:50

gUrM33T

17-Mar-04 14:50

Tomaz Rotovnik wrote:
What is correct procedure for sending F5 key or left arrow key?

None of these actually. Use keybd_event WIN32 API function instead. And if you are using Windows 98 or later, use SendInput for this purpose.

Gurmeet S. Kochar

If you believe in God, it's because of the Devil

Re: Send F5 or left arrow message

Tomaz Rotovnik18-Mar-04 7:25

Tomaz Rotovnik

18-Mar-04 7:25

Thank you

Tomaz Rotovnik

Help With Control Focus

Jack Reed17-Mar-04 4:44

Jack Reed

17-Mar-04 4:44

I have a control I created from a CWnd that contains an edit control and a button.

What I am trying to do is allow a user viewing a screen with this control and other controls to tab through the controls. When the custom control containing the edit control and the button gets focus I want the focus to go to the edit first and then the button when tab is pressed again.

I can make it give the edit control focus but when I hit tab again my custom control loses focus and the button does not get focus.

Any suggestions or examples would be appreciated.

Re: Help With Control Focus

David Crow17-Mar-04 4:53

David Crow

17-Mar-04 4:53

Does the button follow the edit control in the z-order?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: Help With Control Focus

Jack Reed19-Mar-04 9:38

Jack Reed

19-Mar-04 9:38

Yes, it does.

Thank you for your response. I did a little more research and found the answer to my riddle. I used PreTranslateMessage() to capture the tab button being pressed and then I set focus to the child controls of my control accordingly.

what does "rhs" mean?

Bash17-Mar-04 4:23

Bash

17-Mar-04 4:23

Hi,

I recently started learning pure C++ and want to know what does "rhs" mean?

For example:

class MyClass
{
public:
MyClass& operator=(const MyClass& rhs);
};

I've investigated that "rhs" is frequently-used in operator overloaders in C++ classes. What is "rhs"? May I use another word (for example, "dog") instead "rhs"?

Sorry for stupid question.

Yours sincerely,
Alex Bash

Re: what does "rhs" mean?

TFrancis17-Mar-04 4:27

TFrancis

17-Mar-04 4:27

rhs = Right Hand Side. And yes, you can use anything you want, but rhs is normally used because it does a good job of describing the fact that the parameter will be on the right hand side of the = sign.

Tim

Re: what does "rhs" mean?

hph17-Mar-04 4:28

hph

17-Mar-04 4:28

hi,

"rhs" is just the name of the input parameter, you can also use "cat" if you want, but only if you like cats Wink | ;-)

Have a nice day!
hph

Including project files from library

Cedric Moonen17-Mar-04 4:19

Cedric Moonen

17-Mar-04 4:19

Hi !

I need to design a class that will encapsulate an ActiveX object (a chart control). I want to put these files (the .h and the .cpp files) in a library common to all of my projects so I can reuse this class.
The problem is that the files for the ActiveX object need to be in the project directory (I use Add To Project->Components and Control to add the ActiveX to my project).
Is there a macro that I can use like the following way:

#include "CURRENT_PROJECT_DIRECTORY\CChart.h"

in order to access the current project directory from a file within my library ??

The files for the ActiveX cannot be copied in the library. Any idea ??

OpenProcess

hph17-Mar-04 4:03

hph

17-Mar-04 4:03

Hello,

can someone tell me the meaning of the SYNCHRONIZE flag which can be used in OpenProcess ?

Thanks in advance!

Re: OpenProcess

gUrM33T17-Mar-04 14:57

gUrM33T

17-Mar-04 14:57

This flag allows you to use the process handle in any of the wait functions to wait for the process to terminate. BTW, it is available in Windows NT/2000 or later only.

Gurmeet S. Kochar

If you believe in God, it's because of the Devil

Windows NT Device Driver and PCI Bus access on Windows NT

BhaskarBora17-Mar-04 3:57

BhaskarBora

17-Mar-04 3:57

Hi there

I am in need for the following information.

1. Any specific link where i can find info for writing Device-Drivers on Win NT.
2. Link where PCI bus access on Win NT is explained.

thanks in advance...
Bhaskar...

___________________________
When a thing is new, people say, "It's not true." Later, when its truth becomes obvious, people say, "It's not important." Finally, when its importance cannot be denied, people say, "Well, it's not new."

How to creat a graphical back ground and button on a dialog class in MFC?

flow555517-Mar-04 2:58

flow5555

17-Mar-04 2:58

Hey there everyone,

I am a new member of the forum and relatively new to MFC. What I like to know how to create a graphical background and button.

If anyone can gave a specific example or link that will help, it will be very apperciated.

Thanks, Smile | :)

Re: How to creat a graphical back ground and button on a dialog class in MFC?

David Crow17-Mar-04 4:33

David Crow

17-Mar-04 4:33

See if either of these help:

http://www.voidnish.com/articles/ShowArticle.aspx?code=bmpdlg01
http://www.flounder.com/bitmapbutton.htm

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Sharing data among Threads

Cedric Moonen17-Mar-04 2:44

Cedric Moonen

17-Mar-04 2:44

Hello all!

I have a project designed with the MFC document/view architecture. In the App idle time I read some data from a data source (I call a function of my doc class). This data will be displayed in a chart.
But I need also to make some computation on this data but I want to make this in a separate thread (the computation take some times and it cannot stop the reading of the data).
When I start the new Thread, I pass a pointer to my document so it can access data and the data will be stored in a buffer (FIFO buffer).
I was wondering if this is safe to do such a thing ?

Something like that:

BOOL CMyAppDoc::idle()
{
   // read data here
   pFIFOBuffer->AddData(Data);
}

And in the thread function:

//....
pMyDoc->ComputeData();
//...

void CMyAppDoc::ComputeData()
{
    while (TRUE)
        if (pFIFOBuffer->GetData(Data))
            ProcessData(Data);
}

Thanks

Re: Sharing data among Threads

GuimaSun17-Mar-04 3:13

GuimaSun

17-Mar-04 3:13

Some tips:

You must use code to protect multiple multithreading access to any shared data, like critical sections:
CRITICAL_SECTION cs;
InitializeCriticalSection( &cs );
...
EnterCriticalSection( & cs );
shared data access
LeaveCriticalSection( & cs );

You can also use Event primitives to signal end processing, like: CreateEvent, SetEvent, ResetEvent and WaitForSingleObject.

Good luck Smile | :)

GuimaSun
www.nexsun.com.br

Re: Sharing data among Threads

Cedric Moonen17-Mar-04 3:31

Cedric Moonen

17-Mar-04 3:31

Thanks !
Yes I think I will use the critical section, that's easy to use and fit perfectly with my needs.

Thanks Smile | :)

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