C / C++ / MFC

Re: TextOut of CDC

David Crow14-Jun-06 4:00

David Crow

14-Jun-06 4:00

Any particular reason why you are writing in the OnEraseBackground() method? Why not do it in the OnPaint() method?

"The largest fire starts but with the smallest spark." - David Crow

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Re: TextOut of CDC/thanks all

ns14-Jun-06 4:17

14-Jun-06 4:17

Thats what I saw in a sample program, so I used OnEraseBackground.

I did get TextOut to work , thanks everybody.
I'm drawing on the label because I drew a histogram on it and want to put values for the tick marks on the axes. Maybe there is a smarter control to use instead ofa label?
thanks
sb

Re: TextOut of CDC

Hamid_RT14-Jun-06 6:01

Hamid_RT

14-Jun-06 6:01

you can use WM_PAINT instead WM_ERASEBKGND

<br />
void CAnswer::OnPaint()<br />
{<br />
	CPaintDC dc(this);<br />
<br />
dc.SetBkMode(0);<br />
dc.TextOut(50,42,"aaaa",30);<br />
}<br />

whitesky

External program launch issue

Tnarol14-Jun-06 3:22

Tnarol

14-Jun-06 3:22

Hi,

I tried several things to launch an external program :

<br />
CString command("\"D:\\USER\\PSPad editor\\PSPad.exe\" \"log.txt\"");<br />
system(command);<br />

The above code launches a command prompt that closes instantly and doesn't launch PSPad.

<br />
CString command("cmd /C \"D:\\USER\\PSPad editor\\PSPad.exe\" \"log.txt\"");<br />
system(command);<br />

The above code launches a command prompt that launches PSPad but the calling dialog looses focus until I close PSPad.

Actually I'd like to launch my program just like double clicking on "log.txt" would do (without a command prompt would be great). Is it possible ?

Thanks !

Re: External program launch issue

Laxman Auti14-Jun-06 3:31

Laxman Auti

14-Jun-06 3:31

Tnarol wrote:
I'd like to launch my program just like double clicking on "log.txt" would do (without a command prompt would be great). Is it possible ?

Use ShellExecute(...) or CreateProcess(...) API's for launching external application's

Knock out 't' from can't,
You can if you think you can
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Re: External program launch issue

Naveen14-Jun-06 3:32

Naveen

14-Jun-06 3:32

Tnarol wrote:
Is it possible ?

yes

use ShellExecute

nave

Re: External program launch issue

toxcct14-Jun-06 3:32

toxcct

14-Jun-06 3:32

::ShellExecute(NULL, "open", "D:\\USER\\PSPad editor\\PSPad.exe", "log.txt", NULL, SW_SHOW);

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: External program launch issue

Hamid_RT14-Jun-06 5:55

Hamid_RT

14-Jun-06 5:55

See ShellExecute [^]

whitesky

Re: External program launch issue

Tnarol14-Jun-06 3:37

Tnarol

14-Jun-06 3:37

COOL ! It works great !
Thanks everyone.

Re: External program launch issue

_AnsHUMAN_ 14-Jun-06 3:44

_AnsHUMAN_

14-Jun-06 3:44

And you suggested this the other day!!!
Your previous post[^]

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: External program launch issue

toxcct14-Jun-06 3:46

toxcct

14-Jun-06 3:46

broken link...

use the little [getLink] button at the bottom of a thread when using posts liks...

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: External program launch issue

_AnsHUMAN_ 14-Jun-06 3:50

_AnsHUMAN_

14-Jun-06 3:50

http://www.codeproject.com/script/comments/forums.asp?msg=1529273&forumid=1647#xx1529273xx[^]

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: External program launch issue

Laxman Auti14-Jun-06 4:03

Laxman Auti

14-Jun-06 4:03

_AnShUmAn_ wrote:
And you suggested this the other day!!!

COOL !!!

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

HRESULT to exception [modified]

scoroop14-Jun-06 3:16

scoroop

14-Jun-06 3:16

i have a big class that uses com methods. i would like to avoid a lot of "ifs" in it, so i wanted to replace standard hresult checking with try-catch block. there are some articles on code project about that, but the problem is that i have to use VS6 for it. That causes the restriction - i don't have CAtlException.
I also noticed that constructing function that throws something (void function(something) throw(type){...} ) is not doable, because such construction is ignored by the compiler - i get a warning with such a message...

Concluding, my question is - how can i write a class that can replace hresult with exception stuff in VS6 :].

thanks for your ideas in advance

-- modified at 9:18 Wednesday 14th June, 2006

Re: HRESULT to exception

Viorel.14-Jun-06 4:02

Viorel.

14-Jun-06 4:02

Perhaps macros are suitable for you, something like this:

#define CHECK(expr) { if((expr) != S_OK) throw MyException; };

where MyException is your own class. (In case of STL, you can derive it from std::runtime_error).

A sample usage:

try
{
    CHECK(CoCreateInstance(...));
    . . .
}
catch( const MyException & ex)
{
   // exception occured
}

Now you do not have ifs. Anyway, within exception handler you have to provide a method for releasing objects created successfully earlier.

Re: HRESULT to exception

Nemanja Trifunovic14-Jun-06 6:02

Nemanja Trifunovic

14-Jun-06 6:02

I think this article[^] is what you are looking for.

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

Re: HRESULT to exception

scoroop14-Jun-06 13:08

scoroop

14-Jun-06 13:08

as i said... i use VS6 and the article you mention uses CAtlException which is not available there...

I will try the first solution with macro as well Smile | :)

any more ideas? Smile | :)

Re: HRESULT to exception

Michael Dunn14-Jun-06 18:45

Michael Dunn

14-Jun-06 18:45

You can throw anything in C++, you aren't restricted to using a prebuilt exception class.

--Mike--
Visual C++ MVP Cool | :cool:

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Re: HRESULT to exception

scoroop15-Jun-06 20:56

scoroop

15-Jun-06 20:56

you're certainly right, but throwing stuff has restrictions in VS6... when i create a function like this
some_type function(some_arguments) throw(some_type) {...} i receive warning C4290: C++ Exception Specification ignored. it seemslike you cannot throw anything with a function in VS6 using this expression :/. and that is my problem. how can i do this in VS6?
thanx in advance

Re: HRESULT to exception

Michael Dunn15-Jun-06 21:13

Michael Dunn

15-Jun-06 21:13

That's an exception specification, not an actual throw of an exception. It's saying "this function might at some point throw an exception of type some_type" Take it out, it's ignored by the compiler anyway.

--Mike--
Visual C++ MVP Cool | :cool:

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VB > soccer

Subject: GUI design in VS 2005

kitty514-Jun-06 2:57

kitty5

14-Jun-06 2:57

I'm learning how to use Visual Studio 2005 and how to implement GUI design in C++. In the past, I've only programmed in command prompt style (basically using emacs and then gcc to compile, etc.)

Now that I'm learning to do GUI design using Visual Studio 2005 I was wondering if anyone knows and can suggest a book for beginner GUI design.

That would be great!

Thanks Big Grin | :-D

Kitty5

Re: Subject: GUI design in VS 2005

Cedric Moonen14-Jun-06 3:12

Cedric Moonen

14-Jun-06 3:12

A book not but I suggest you work with the MFC first (Microsoft Fundation Classes). If you are using the Express edition of Visual Studio 2005, they are not supplied with unfortunately.

After you get you firm grip over MFC, it is always nice to dig into the details of WIN32 API. To know how MFC does the job.

Cédric Moonen
Software developer

Charting control

Re: Subject: GUI design in VS 2005 [modified]

James R. Twine14-Jun-06 3:55

James R. Twine

14-Jun-06 3:55

   The Windows Interface Guidelines for Software Design[^], and its replacement, The Windows User Experience[^].

   Given the amount of Broken GUI out there, everyone that writes code should read UI design books of some sort. (Geeze, even all of text-based Linux GUIs that I have to use STILL do not allow Shift+Tab to navigate controls backwards...) Those two books are well worth reading cover-to-cover.

   Peace!

-=- James

If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
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-- modified at 9:55 Wednesday 14th June, 2006

STL set_intersection

Abhi Lahare14-Jun-06 2:53

Abhi Lahare

14-Jun-06 2:53

hi,
Can I use set_intersection function to find out the itersection of containers which contains user defined type objects or it works only with standard datatypes?

Thanks in advance,
Regards
Abhi Lahare

Re: STL set_intersection

Laxman Auti14-Jun-06 3:09

Laxman Auti

14-Jun-06 3:09

Abhi Lahare wrote:

Can I use set_intersection function to find out the itersection of containers which contains user defined type objects

Yes you can.

For that you have create your binary predicate function and use it as a last parameter of the set_intersection function.

for e.g

bool mod_lesser (int elem1, int elem2 )<br />
{<br />
   if ( elem1 < 0 ) <br />
      elem1 = - elem1;<br />
   if ( elem2 < 0 ) <br />
      elem2 = - elem2;<br />
   return elem1 < elem2;<br />
}

you may change int to UDT.

Abhi Lahare wrote:
it works only with standard datatypes?

Not neccessary,It should works for UDT also. Smile | :)

Knock out 't' from can't,
You can if you think you can
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