C / C++ / MFC

Re: How to dispatch WM_LBUTTONDOWN message after calling ReleaseCapture()?

2-Sep-09 9:07

Convert the position given in the WM_LBUTTONDOWN message to screen co-ordinates. Use GetWindowFromPoint to get the window at that position. Post the WM_LBUTTONDOWN message to that window, remembering to convert the screen co-ordinates to client co-ordinates for that window.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

includeh103-Sep-09 7:45

includeh10

3-Sep-09 7:45

Thanks, all are fine now.

the function is WindowFromPoint(...) - first time I use it.

char char[] variables help

egerving2-Sep-09 8:26

egerving

2-Sep-09 8:26

I am a major newbie to window API and coding in C C++. I'm having a major problem with character variables. In other languages you can just say
variable char x = "Hello"
variable char y = "I'm stupid"
x="No, I'm really not stupid"
x=y

but in c a char is basically a number from the ASCII table
and if you define char x[112] you then can't say x="Hello" because I guess x must be 112 chacters. But you can say x[]="Hello" which is ok if you just want a variable for "Hello" but if you want use a variable and assign it to different values and/or concatenat different values to it what do you do.

Anyone have any simple answers as to how to use character variables in c c++?

What I want to do is create a text file that's 112 characters on each line.

1-2= a two digit code
3-12=yyyy/mm//dd
13-20=hh:mm:ss
21-40=a barcode retrieved from an editbox
41-60=blank
61-80=blank
81-81=a single digit code
82-92=a decimal 10,2 retrieved from an editbox
92-102=a number retrieved from an edit box
103-112=a number

if numbers / values are less than allowed their padded with spaces

something like this is easy in other languages but in windows api c c++ seems to be very difficult

thanks for any help

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer2-Sep-09 8:47

2-Sep-09 8:47

There's not going to be all that simple an answer for you. What you are asking for is the stuff you learn in a lesson, or from a book - not from a quick post.

But here's a start.

char means character. In those other languages, "Hello" is a string, not a char either.

Another work for character is letter. So, 'H' is a char, "Hello" is a string, or bunch of characters one after another.

char message [] = "Hello";

That means that the message variable is an arrach of characters - or an array of letters. In this case, 'H' followed by 'e', 'l', 'l', 'o', and lastly a char value of 0, to denote the end of a string.

And that's all I'll reply - otherwise I'll write a book for you - and other people have already done that.
But hopefully ot will get you started on your journey.

I learned from Kernigan & Richie - small language, small book.

Now, if you want to *pay* me to write you a book...

Iain.

I have now moved to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), or need cotract work done, give me a job! http://cv.imcsoft.co.uk/[^]

Stuart Dootson2-Sep-09 9:01

2-Sep-09 9:01

egerving wrote:
if you define char x[112] you then can't say x="Hello" because I guess x must be 112 chacters

No - it's because a C string, when referred to by name, is a pointer, not an array. You can use strcpy and strcat (and many other functions) to build strings.

For your situation, I'd probably use fprintf to write each record to the file, using width specifications - something like:

fprintf(fileHandle, "%-2d%-4d/%-2d/%-2d%-2d%-2d:%-2d%-20s                                        %-1d%-11.2f%-11d%%-10d\n", firstCode, year, month, day, hour, minute, second, barcode, secondCode, decimal, firstNumber, secondNumber);

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Randor 2-Sep-09 9:09

Randor

2-Sep-09 9:09

Hi egerving,

This basic tutorial might help:

C++ Language Tutorial[^]

If you are serious about learning the C++ language here is a list of some of the best. You may want to consider purchasing some of them.

The Most Important C++ Books...Ever[^]

Best Wishes,
-David Delaune

David Crow2-Sep-09 9:50

David Crow

2-Sep-09 9:50

egerving wrote:
...and if you define char x[112] you then can't say x="Hello" because I guess x must be 112 chacters.

Valid:

char x[112] = "Hello";

Invalid:

char x[112];
x = "Hello";

egerving wrote:
...if you want use a variable and assign it to different values and/or concatenat different values to it what do you do.

For C, use functions like strcpy() and strcat(). For C++, use the string class.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

egerving2-Sep-09 11:31

egerving

2-Sep-09 11:31

Thank you all very much for your posts. Every little bit helps. I think I'm really starting to like this site as this is the second time I've made a post and got responses both times!

Thank you.

Security Access Functions

Joe Woodbury2-Sep-09 17:11

Joe Woodbury

2-Sep-09 17:11

One thing to understand is that in ALL languages a character is a number. With C/C++ it's just more obvious about it. In pure C/C++ and Assembly, you are simply doing manually what high level languages do behind your back. (With CString and string in C++, you can also treat strings as "abstract" objects.)

* * *

For the text file question, look at cout, and its cousins, though I vastly prefer printf()/fprintf() and its cousins.

printf("%02d%04d/%02d/%02d%02d:%02d:%02d and so on

(One variant of this is printf("%.2d%.4d/%.2d/%.2d%.2d:%.2d:%.2d. I prefer the former, but you will run into the latter and should be aware of it.)

Richard Andrew x642-Sep-09 7:28

Richard Andrew x64

2-Sep-09 7:28

I need to remove security descriptors from certain registry keys.

What functions would be of interest for this operation?

( The problem is that even the administrator is being denied access to change key values, and I am going to try to manually remove all descriptors, hoping that this might fix it. )

Stuart Dootson2-Sep-09 8:17

2-Sep-09 8:17

Seems unlikely that'll work - you'll get 'access denied' status returns, I would have thought.

However, I think these should be of use - GetNamedSecurityInfo[^] to retrieve something's ACL, SetEntriesInAcl[^] to create a new ACL from that ACL, DeleteAce[^] to delete an ACE from an ACL and SetNamedSecurityInfo[^] to set the new ACL on the object.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Richard Andrew x642-Sep-09 9:47

Richard Andrew x64

2-Sep-09 9:47

Thank you for the information. Smile | :)

Randor 2-Sep-09 8:45

Randor

2-Sep-09 8:45

Hi Richard,

The Administrator can obtain a handle to the registry key with WRITE_OWNER access. The administrators group by default has SE_TAKE_OWNERSHIP privilege. The following Help and Support article should work.

INFO: Taking Ownership of Registry Keys[^]
INFO: Changing Ownership of a Securable Object[^]

Best Wishes,
-David Delaune

Setting x-microsoftajax:Delta=true header Giving http error "400"

Richard Andrew x642-Sep-09 9:48

Richard Andrew x64

2-Sep-09 9:48

Thanks very much for those links. I'll read them carefully. Smile | :)

Ash_VCPP2-Sep-09 5:38

Ash_VCPP

2-Sep-09 5:38

Hi All

i am posting one url with setting this "x-microsoftajax;Delta=true" header but i am getting "400" http error code, can someone please give me suggestions on it.....

Thanks A Ton
Ash_VCPP
walking over water is just knowing where the stones are.....

MDI framework do not cross over through OnActivateFrame(int nCmdShow) ?

mesajflaviu2-Sep-09 4:41

mesajflaviu

2-Sep-09 4:41

Can anybody tell my why MDI framework do not cross over through OnActivateFrame(int nCmdShow) ? I build a MDI test application ( doesn't matter CView based on ) and I override CMainFrame::OnActivateFrame(int nCmdShow) where I put a TRACE0("\n Here cross over OnActivateFrame \n"); statement and compile in Debug version , but Output window doesn't show anything ... can you tell my why ?I mention that SDI framework haven't this problem ...And for what I need that handler : to memorate window position ...

Re: MDI framework do not cross over through OnActivateFrame(int nCmdShow) ?

Stuart Dootson2-Sep-09 5:11

Re: MDI framework do not cross over through OnActivateFrame(int nCmdShow) ?

2-Sep-09 5:11

OnActivateFrame is an overridable method of CView, NOT the frame window class.

You may find OnActivate is the overridable method you're look for.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

mesajflaviu2-Sep-09 7:54

mesajflaviu

2-Sep-09 7:54

Good catch ! And in case that I not load a child window like this :

// suppress automatic creation of child window
if(CCommandLineInfo::FileNew == cmdInfo.m_nShellCommand)
    cmdInfo.m_nShellCommand = CCommandLineInfo::FileNothing;

where should I load WINDOWPLACEMENT structure ? Anyway , thanks for answer !!

Re: MDI framework do not cross over through OnActivateFrame(int nCmdShow) ?

Stuart Dootson2-Sep-09 8:45