C / C++ / MFC Discussion Boards

Re: Getting started -- a most basic question

Derek Waters14-Feb-02 17:12

14-Feb-02 17:12

As this site is squarely aimed at MS-based products, and this forum is titled "Visual C++", it is unlikely that you're going to get a recommendation for Borland or Bloodshed over VC++.

Certainly MFC (part of Visual C++) is the "application framework" you need in answer to (b). To just create and manipulate simple Windows objects (a), though, you could just use Win32 API (which presumably is supported by Bloodshed and Borland). Examples can be found in the Platform SDK documentation at www.microsoft.com

Hope this helps.

------------------------
Derek Waters
derek@lj-oz.com

Re: Getting started -- a most basic question

moliate14-Feb-02 23:42

moliate

14-Feb-02 23:42

I started with Borland, but now I do VC++ only. I suggest you start with Visual Studio as your first environment. There is nothing wrong with Borland and OWL, but there are so much more samples in MFC around, making it easier to learn.

/moliate

Re: Getting started -- a most basic question

Navier15-Feb-02 14:23

Navier

15-Feb-02 14:23

I'd say use VC++ as well. You'll be more in demand commercially and there's more help/samples/info about for it. Get a copy of Petzold (Programming Windows) as well and if you do go MFC later get Prosise (Programming Windows with MFC)

i1.2sqrt(u).bcos(ur)sec(c)
but
b4.isqrt(u).ru/16

Navier

data validation

padgyx14-Feb-02 13:55

padgyx

14-Feb-02 13:55

I have a problem with a simple c++ console program.
I want user enter a string to enter their name, if user enters nothing like a enter key, the blank data should be caught and an error message should be print out on the console.
what I did was I declared a string name, then use name.lenght() function and compare it with 0, if(name.length()==0), but this cannot catch the enter key. Then I tried getch(), it catches enter key but it is not a string. What shall I do?
Thanks!

padgyx

Re: data validation

Rick York14-Feb-02 14:22

Rick York

14-Feb-02 14:22

You can use fgets. If the string has whitespace or a newline then nothing was enterred and you have an error.

Re: data validation

Atul Dharne14-Feb-02 14:48

Atul Dharne

14-Feb-02 14:48

If you are using getch() you can always catch the Enter key(0x0D) this way...

.
.
.
char key;
key = getch();
if(key == '\n') //or if(key == 0x0D)
{
.
.
//do whatever you want
cout<<"You pressed Enter"<<endl;
}
.
.

Atul

Sonork 100.13714 netdiva

Re: data validation

15-Feb-02 6:27

Hi, Atul:

I tried this getch(), it works, but char key can only input one char at a time, what I want is a string or at least a c_str as the input. However, if I use string or c_str, then catching the enter key (a blank) is a problem. It seems that only getch() can catch the enter key. If I use the first element of c_str to check the enter key, it does not work.
I will try the fgets().

thanks.

Re: data validation

Ravi Bhavnani15-Feb-02 6:54

Ravi Bhavnani

15-Feb-02 6:54

You could just use gets().

char szInput [INPUT_SIZE];
gets (szInput);
if (strlen (szInput == 0)) {
   ; // error
}

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: data validation

15-Feb-02 9:42

Thanks Ravi:

I will give it a try.
It seems that my thread cannot roll back to the front of the forum even I reply or update the message at latest time. How can I come to my thread to view other people's comment more easily?
Another forum, Javaranch.com, can roll back your thread to the front if you reply the message at latest time.

Thanks.

pad

Re: data validation

padgyx15-Feb-02 15:14

padgyx

15-Feb-02 15:14

Ravi:

It works now. Thanks a lot!
Do you know anyway that I can use string directly instead of a c_string? Or do you know how to convert a c_string to a string? Sorry about my dum questions.

padgyx

Control for Icon Editor?

14-Feb-02 12:51

What type of control would be best suited for use as the editable icon display in an icon editor?

K

Re: Control for Icon Editor?

Nish Nishant14-Feb-02 14:22

Nish Nishant

14-Feb-02 14:22

Anonymous wrote:
What type of control would be best suited for use as the editable icon display in an icon editor?

I dont think any windows control comes near the required functionality. So just create a window and handle all the required mouse messages and painting accordingly. In MFC you might derive a class from CWnd and write your own custom control.

Nish

Nish was here, now Nish has gone;
He left his soul, to turn you on;
Those who knew Nish, knew him well;
Those who didn't, can go to hell.

I like to Jig | [Dance]

on the Code Project

Sonork ID 100.9786 voidmain
www.busterboy.org

Re: Control for Icon Editor?

Jon Hulatt14-Feb-02 22:16

Jon Hulatt

14-Feb-02 22:16

What I sometimes do for this kind of stuff is start with a CStatic. It has very limited functionality anyway, but you can draw it on a dialog in the dialog editor and get your layout sorted nicely.

Jon

Sorry to dissapoint you all with my lack of a witty or poignant signature.

How detect what memory apply/need the app ?

Wizard_0114-Feb-02 11:02

Wizard_01

14-Feb-02 11:02

I have big array (about 1 000 - 100 000 items) . How can I detect what memory the app occupy ??

(Iam finding the best solution to store items in memory.)

Confused | :confused:

Re: How detect what memory apply/need the app ?

Nish Nishant14-Feb-02 11:19

Nish Nishant

14-Feb-02 11:19

Wizard_01 wrote:
I have big array (about 1 000 - 100 000 items) . How can I detect what memory the app occupy ??

That depends on the type of array. If it is an array of bytes, a 100,000 size array would be 100,000 bytes. If it is an array of objects or structs, then use sizeof to find the size of that object and multiply by 100,000.

Example :- for an array of type myStruct
tot_mem_reqd_for_array = array_size * sizeof myStruct

Nish

Nish was here, now Nish has gone;
He left his soul, to turn you on;
Those who knew Nish, knew him well;
Those who didn't, can go to hell.

I like to Jig | [Dance]

on the Code Project

Sonork ID 100.9786 voidmain
www.busterboy.org

Re: How detect what memory apply/need the app ?

Atul Dharne14-Feb-02 14:53

Atul Dharne

14-Feb-02 14:53

Wizard_01 wrote:
I have big array (about 1 000 - 100 000 items) . How can I detect what memory the app occupy ??

For getting memory occupied by array you can use the sizeof operator.

int  array[] = { 100, 200, 300 };     // sizeof( array ) is 12 sizeof(int)=4bytes for 32-bit OS
size_t  sizearr = sizeof( array );

Atul

Sonork 100.13714 netdiva

Modifying HTML-source before displaying it in the browser

User 665814-Feb-02 10:29

User 6658

14-Feb-02 10:29

Hi
I hope someone of you is able to solve my problem.

What I want to do is to write a plugin for the InternetExplorer (a so called BHO - Browser Helper Object) that will modify the HTML content before InternetExplorer displays the webpage.

I already wrote a plugin which will catch the DWebBrowserEvents2::DocumentComplete event. This is my code which works so far:

HRESULT __stdcall CCounter::DocumentComplete(IDispatch* pDisp, VARIANT * URL )
{
	ATLTRACE(_T("CCounter::DocumentComplete\n"));
	
        return S_OK;
}

What I now want to do is a bit complicated:
Before the browser is about to display the webpage I want to get access and to the document's content and modify it (e.g. for removing keywords previously defined in an external file)

I hope someone of you can help me, since it is a question which can't be explained in 1 minute.

Thanks in advance

regards
Gregor

modified 12-Sep-18 21:01pm.

Re: Modifying HTML-source before displaying it in the browser

moliate15-Feb-02 0:04

moliate

15-Feb-02 0:04

When the DocumentComplete event is sent, a great deal of rendering is already done. This will not prevent you from modifing the document "on the fly". What I would suggest is the following:

1) QueryInterface pDisp for the IWebBrowser2 interface (or call Invoke directly)

2) Use IWebBrowser2::get_Document to get a pointer to the (Dispinterface of; QueryInterface again) IHTMLDocument2. If the document contains frames you have to find the interface for each frame, and repeat step 3 for each of them.

3) Get the body element and send it to an recursive function that handles each leaf element (gets/puts outer text). It then finds all element children and feed them back to the function.

This is just an suggestion, and perhaps someone has a better solution. Sorry if I don´t go into all technical details, but I hope this will help a little.

/moliate

Re: Modifying HTML-source before displaying it in the browser

15-Feb-02 13:26

As I recall from my prevous experience on close to that issue:
DocumentComplete Event may not be always fired... So, check Refresh for example... I recall it didn't work for me... But again, it could be previous versions of WebBrowser...
Everything else as rightly described in previous message...
GL
Igor

the usage of atol function?

lucy14-Feb-02 9:45

lucy

14-Feb-02 9:45

Hi, I tested the atol() function. This line works fine:

char buffer[] = "1234567890.12";
long number = atoi(buffer); // number = 1234567890;

but here is problem after I added the following lines:

buffer[10] = '\37'; // buffer = "1234567890712" now
number = atoi(buffer); // return value is 1912276760. why? Confused | :confused:

thank you very much for your advice! Rose | [Rose]

Re: the usage of atol function?

lucy14-Feb-02 9:46

lucy

14-Feb-02 9:46

sorr, typing error:

buffer[10] = '\37'; ==> buffer[10] = '\x37'; Blush | :O

Re: the usage of atol function?

Nish Nishant14-Feb-02 10:25

Nish Nishant

14-Feb-02 10:25

A long is a 32 bit number.
The biggest it can store is 4294967295
1234567890 < 4294967295
But
1234567890712 > 4294967295

That's why you get this overflow error.

Nish

Nish was here, now Nish has gone;
He left his soul, to turn you on;
Those who knew Nish, knew him well;
Those who didn't, can go to hell.

I like to Jig | [Dance]

on the Code Project

Sonork ID 100.9786 voidmain
www.busterboy.org

Re: the usage of atol function?

lucy14-Feb-02 10:29

lucy

14-Feb-02 10:29

Ah, I see. Thank you, Nish. Rose | [Rose]

HtmlHelp API questions...

Maximilien14-Feb-02 9:03

Maximilien

14-Feb-02 9:03

I'm trying to figure out how this beast is supposed to work to be able to show popup contextual help windows?

The tech-writter gave me a help.chm file that has a [TEXT POPUP] section in it with the text file that contains all the contextual help descriptions like :

context.txt :

.topic HID_TOPIC_DO_SOMETHING
This functionnality will do something

and context.h :

#define HID_TOPIC_DO_SOMETHING 4567

in my program I'm doing the following:

 HH_POPUP popupText = { sizeof(HH_POPUP), // cbStruct              
                        theApp->m_hInstance, // hinst
                        4567,// idString
                        NULL,// pszText
                        {100, 100},// pt
                        (DWORD) -1, // default clrForeground;
                        (DWORD) -1, // default clrBackground;
                        {-1, -1, -1, -1}, // default rcMargins;
                        NULL// default pszFont;
                        };

// The call where helpFile is the fully path name of the chm file with the context.txt internal file name of the contextual help
// with the format : (something like ) "c:\\help.chm:/context.txt"

 ::HtmlHelp(m_hWnd,helpFile, HH_DISPLAY_TEXT_POPUP  ,(DWORD) &popupText);

But it doesn't work really well, it doesn't work at all, I don't know exactly what happening, but the topic is not found!

Is this supposed to work ? Should it be used ? the documentation in MSDN is not really usefull, and what I could find on the web, wasn't really usefull either!

If you have any hints, tips or additional resources for this I'd appreciate !

Thanks!
Max.

Re: HtmlHelp API questions...

Tim Smith14-Feb-02 12:22

Tim Smith

14-Feb-02 12:22

Here is the code I use

	// @cmember Display the actual help

	static HWND DoHtmlHelp (HWND hwndCaller, 
		LPCTSTR pszFile, UINT uCommand, DWORD dwData)
	{
#if !defined (_WIN32_WCE)
		//
		// Display a wait cursor
		//

		CWaitCursor wait;

		//
		// Cancel any tracking modes
		//

		if (hwndCaller)
		{
			CWindow wMain;
			wMain .Attach (hwndCaller);
			wMain .SendMessage (WM_CANCELMODE, 0, 0);
			wMain .SendMessageToDescendants (WM_CANCELMODE, 0, 0, TRUE);
		}

		//
		// Attempt to cancel capture
		//

		HWND hWndCapture = ::GetCapture ();
		if (hWndCapture != NULL)
			::SendMessage (hWndCapture, WM_CANCELMODE, 0, 0);

		//
		// Finally, run the Help engine
		//

		return HtmlHelp (hwndCaller, pszFile, uCommand, dwData);
#else
		return NULL;
#endif
	}

	// @cmember Display a popup 

	static HWND DoHtmlHelpPopup (LPTSTR pszHelpFile, HWND hWndCtrl, DWORD dwID)
	{
#if !defined (_WIN32_WCE)
		RECT rect;
		::GetWindowRect (hWndCtrl, &rect);
		HH_POPUP pop;
		pop .cbStruct = sizeof (pop);
		pop .hinst = NULL;
		pop .idString = dwID;
		pop .pszText = NULL;
		pop .pt .x = (rect .left + rect .right) / 2;
		pop .pt .y = (rect .top + rect .bottom) / 2 + 8;
		pop .clrForeground = -1;
		pop .clrBackground = -1;
		pop .rcMargins .left = 20;
		pop .rcMargins .top = 8;
		pop .rcMargins .right = 8;
		pop .rcMargins .bottom = 8;
		pop .pszFont = NULL;
		return DoHtmlHelp (hWndCtrl, pszHelpFile, 
			HH_DISPLAY_TEXT_POPUP, (DWORD) &pop);
#else
		return NULL;
#endif
	}

Tim Smith
Descartes Systems Sciences, Inc.

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