Put different data types in binary form in a char array? - C / C++ / MFC Discussion Boards

Re: const type;

Maximilien22-Jan-05 8:48

Maximilien

22-Jan-05 8:48

constness is a compile time hint.

const int tata = 5;
...
tata = 4; // you will get a compile error.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: const type;

Joaquín M López Muñoz23-Jan-05 4:50

Joaquín M López Muñoz

23-Jan-05 4:50

If you mean "writing generic code which knows whether a given type is const or not" you can have something like that:

template <class T>
my_generic_class
{
};
 
// specialization for const types
template<class T>
my_generic_class<const T>
{
// implementation taking into account the type is const
}

Other than that, Boost.TypeTraits[^] features an utility called is_const which determines at compile time the constness of a type. I'm not sure if tihs is what you're after.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
Want a Boost forum in Code Project? Vote here[^]!

How to idntification device manufacture of pocket pc?

arash47122-Jan-05 7:24

arash471

22-Jan-05 7:24

How to idntification device manufacture of pocket pc?

Send cookie in HTTP request

dorutzu22-Jan-05 6:32

dorutzu

22-Jan-05 6:32

Hi,

I'm using an http request from my VC++ 6.0 application(FYI, I'm using MSXML::IXMLHttpRequestPtr ). The idea is that I would like to send a cookie as well, but I don't know how to do this, and more than that, how to get this cookie. But I do know that the user is using IE 5.5+ and the cookie is stored on his computer. The idea is to authenticate with the server using the cookie(that is already on the computer), without having the user to type in some usernames and passwords.

Thanks,
Doru

remove installed programs programmatically?

LukeV22-Jan-05 6:11

LukeV

22-Jan-05 6:11

Is this possible? If so how? Confused | :confused:

Re: remove installed programs programmatically?

ThatsAlok23-Jan-05 18:13

ThatsAlok

23-Jan-05 18:13

hian lukeV all installed program information are stored in registry key here

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall

now here just enumerate here each key for it's UninstallString and use them for unistalling partcular app.

"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk

my keyboard is not working, using screen keyboard these days

WMA Decoder Source Code

aRtsZ22-Jan-05 5:37

aRtsZ

22-Jan-05 5:37

Could anyone give me the source code of the wma decoder?
I have tried to find it for a long time but failed.
Really really thanks a lot!!!~~

Put different data types in binary form in a char array?

capriole22-Jan-05 5:22

capriole

22-Jan-05 5:22

I am new with C++ and I would like to know if it is possible to write and later extract from an array of type char, variables of different types (UINT, USHORT, ULONG) in binary form?

An example of what I want is

char buffer[BUFFERSIZE];

UINT a, b;
USHORT c;

Now I want to put these variables in their respective binary format in the buffer, send it down a TCP/IP socket and read it back in some other variables in a different process.

Thanks for any help.

Re: Put different data types in binary form in a char array?

toxcct22-Jan-05 7:53

toxcct

22-Jan-05 7:53

is this satisfy to you ?

<font color=#0000FF>long</font> myLong = 0x1254FA5C;    <font color=#008000>// For example...</font>
<font color=#0000FF>char</font> cTab[4] = {0};
 
<font color=#008000>// let's say cTab[0] is MSB</font>
cTab[0] = (myLong & 0xFF000000) >> 24;
cTab[1] = (myLong & 0x00FF0000) >> 16;
cTab[2] = (myLong & 0x0000FF00) >> 8;
cTab[3] = (myLong & 0x000000FF);
 
<font color=#008000>// cTab[] is now : {0x12, 0x54, 0xFA, 0x5C} in binary format</font>

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: Put different data types in binary form in a char array?

capriole25-Jan-05 5:39

capriole

25-Jan-05 5:39

Hi,

Thanks for your reply, your answer satisfies completely my need and sorry for my late reply.

Smile | :)

Re: Put different data types in binary form in a char array?

toxcct25-Jan-05 9:40

toxcct

25-Jan-05 9:40

you're welcome...

i'm here to help the best i can, so i'm happy my answer is exactly what you expected of one of us...

see you on CP...

cheers,

(ps: when an article satisfy you, you can vote for it... Wink | ;)

)

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Remedial UI Thread ?

ddut22-Jan-05 4:48

ddut

22-Jan-05 4:48

First, I apologize for the remedial question. I am fairly new to Windows Programming (5+ yrs embedded C though).

I have an MFC dialog based ap which has a "RUN" button. The Run button starts a measurement function which interfaces with pieces of test equipment over COM1 and GPIB.

Currently, the measurement function takes ~4 minutes, during which time the dialog is frozen.

I want to make the program multithread so that controls in the dialog, Oven Temperature for example, update during the measurement function.

I am a bit confused how to use a UI thread with my current dialog box.

Can someone offer some tips on how to convert the current dialog based ap to make use a UI thread and several worker threads (I understand the worker thread part).

Thanks a bunch.

Re: Remedial UI Thread ?

Gary R. Wheeler22-Jan-05 10:50

Gary R. Wheeler

22-Jan-05 10:50

Try here[^].

Software Zen: delete this;

please tell me the difference

vividwu22-Jan-05 3:32

vividwu

22-Jan-05 3:32

hi:thx all
please have a look at the following program:

const CStudent& operator =(const CStudent& s)
{...... }

BOOL operator ==(const CStudent& s) const {...... }
what is the diffence putting const between before the definition of function and at the end of definition of function?

Re: please tell me the difference

Bob Ciora22-Jan-05 3:49

Bob Ciora

22-Jan-05 3:49

In the first case, the const is used to specify the return type. The return value can't be used as an "l-value" (i.e. on the left hand side of an equals sign) in another expression. So operator = in the case above is returning a const reference to a CStudent object.

In the second case const specifies that the function itself will not modify any of the internal data of the class declaring the operator == method. If the operator == function tried to modify any of the internal CStudent data, you'd get a compiler error.

Hope it helps!!

Bob Ciora

Global Objects in MFC Programs

phijophlip22-Jan-05 1:59

phijophlip

22-Jan-05 1:59

Hello,

Can anyone tell what is the use for the declaration of global objects in MFC programming?

Hoping for a reply,
Frown | :(

Philip

Re: Global Objects in MFC Programs

Gary R. Wheeler22-Jan-05 3:15

Gary R. Wheeler

22-Jan-05 3:15

Which objects are you referring to?
Are you asking how to do it?

Software Zen: delete this;

Re: Global Objects in MFC Programs

Bob Ciora22-Jan-05 3:30

Bob Ciora

22-Jan-05 3:30

Decalaring a global object ensures that your object instance exists before your MFC application runs, and that it will be destructed after your application exits. Your CWinApp-derived main application class in an MFC program is a global object.

Bob Ciora

How can I know if the user is pressing on a CButton for more than 250msec? (MFC CButton)

rbid22-Jan-05 1:20

rbid

22-Jan-05 1:20

Hello,

This question is for an MFC application.

How can I know if the user is pressing on a button for more than 250msec?
As far I know, I get the BN_CLICKED only once, and only when the user releases the button Frown | :(

Any hint?

-- Ricky Marek (AKA: rbid)
-- "Things are only impossible until they are not" --- Jean-Luc Picard

My articles

Re: How can I know if the user is pressing on a CButton for more than 250msec? (MFC CButton)

Gary R. Wheeler22-Jan-05 2:25

Gary R. Wheeler

22-Jan-05 2:25

Create your own button class CMyButton, which subclasses the existing CButton. Add a handler for the WM_LBUTTONDOWN message to CMyButton. In the handler, post a notification to the parent dialog like this:

WPARAM wParam = MAKEWPARAM(GetDlgCtrlID(),BN_PRESSED);
LPARAM lParam = (LPARAM)m_hWnd;

GetParent()->PostMessage(WM_COMMAND,wParam,lParam);

where BN_PRESSED is a notification code you've defined. In your dialog, add a handler for the BN_PRESSED notification. In the handler, start a timer (try using QueryPerformanceCounter). In your BN_CLICKED handler, get the value of the timer and compare the difference.

Software Zen: delete this;

Some question about MCIWndSave()

hcgiap21-Jan-05 22:40

hcgiap

21-Jan-05 22:40

LONG MCIWndSave(
hwnd,
szFile
);

MSDN mention that if the szFile is -1, then it will pop up a sava dialog box to let me choose the location for the wav file that i have recorded. But it never come out even though i have written... How come?

Another question is how can i disable the play button when i use MCIWndCreate? There is no option to let me disable the play button. For menu and record have, but play button don't have. (actually i just need the trackbar)

Re: Some question about MCIWndSave()

hcgiap24-Jan-05 7:59

hcgiap

24-Jan-05 7:59

anyone can help?? pls!!

Unit tests

Ravi Bhavnani21-Jan-05 17:48

Ravi Bhavnani

21-Jan-05 17:48

Hacking is what keeps me up nights - unit tests let me sleep at night. I Rose | [Rose]

tests!

Just wanted to share...

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

Re: Unit tests

Bob Ciora21-Jan-05 19:02

Bob Ciora

21-Jan-05 19:02

Whatever works for you! But all true hackers drink gallons of coffee and never sleep :p

Bob Ciora

Re: Unit tests

Henry miller24-Jan-05 4:47

Henry miller

24-Jan-05 4:47

Doesn't matter. I test and test and test. Then I scream we need a seperate test group. I still wake up in the middle of the night once in a while when I realize I forgot to test some obscure case. Or when a customer discovers one bug and I realize it has a more general case that is likely to hit others.

It helps to have a seperate test group, but even when I was lucky enough to have a good one the above happened.

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