C / C++ / MFC Discussion Boards

LunaticFringe4-Oct-03 22:26

4-Oct-03 22:26

You're problem is probably related to the page size / dpi of the printer. Printers typically have very large pixel counts - 300 dpi or more. You need to use GetDeviceCaps to get the vertical and horizontal pixel counts of the printer and scale your image accordingly.

Re: PRINTING -VC++

radha vijay6-Oct-03 14:18

radha vijay

6-Oct-03 14:18

I tried printing, but perhaps am making some mistake..

Could u please give me an example of how to do?Should i use it in onprepareprinting?Wud b great if u cud help me.

Thankyou.

Key accelerators

BoudewijnEctor4-Oct-03 5:53

BoudewijnEctor

4-Oct-03 5:53

Hi,

I've made a key accelerator for my program (I did it by using the resource view), and I want to 'attach' it to my windows. How can I make sure that the accelerator table is associated with the window?

Thanks

Re: Key accelerators

Mike Dimmick4-Oct-03 7:48

Mike Dimmick

4-Oct-03 7:48

If you're using MFC, and the window in question is a frame window (derived from CFrameWnd), it already has support for accelerators. To make the frame window load the accelerator table at the same time as the menu and other resources, give it the same resource ID as the menu and use LoadFrame to create the frame window.

If you want an alternate set of accelerators, use LoadAccelTable.

For a non-CFrameWnd window, you'll need to call LoadAccelerators to load the table, and insert a call to TranslateAccelerator in an override of PreTranslateMessage, returning TRUE if TranslateAccelerator does.

I don't know enough WTL to offer a suggestion.

If you're using the raw Win32 API, insert a call to TranslateAccelerator before your call to TranslateMessage in your message loop.

Timers in MFC

BoudewijnEctor4-Oct-03 5:41

BoudewijnEctor

4-Oct-03 5:41

Hi,

I need to build some kind of app which, display a picture and after 10 seconds the next, etc......

To do that, I'll need some kind of timer conrol (like the Timer in .NET), is there something like that in MFC. If there is (I thinks there is), can somebody tell me how to use it?

Thanks

Re: Timers in MFC

NewHSKid4-Oct-03 5:46

NewHSKid

4-Oct-03 5:46

There is a sleep function that you can use. I just use it as a puase between command, so if i think you want to use it for the same purpose it would be ok. Maybe you can display the first pic, then sleep, then remove the first pic and display the second pic?

Sleep(time)
btw, time is in milliseconds.

Jimmy

Just cause I am 15, doesn't mean I'm dumb! (I'll really be 4 on Feb. 29...the year 2004)

Re: Timers in MFC

Mike Dimmick4-Oct-03 7:50

Mike Dimmick

4-Oct-03 7:50

Sleep is a blocking call. No Windows messages can be processed while your thread is blocked. This means that the rest of the user interface will be very unresponsive.

If you don't need the timer to be very accurate, use SetTimer to have Windows send you a message when a timer expires.

Re: Timers in MFC

Michael Dunn4-Oct-03 6:28

Michael Dunn

4-Oct-03 6:28

Look up SetTimer() and KillTimer()

--Mike--
Ericahist | Homepage | RightClick-Encrypt | 1ClickPicGrabber
CP SearchBar v2.0.2 released

Re: Timers in MFC

Ted Ferenc4-Oct-03 7:41

Ted Ferenc

4-Oct-03 7:41

CreateWaitableTimer() and SetWaitableTimer() can also be used

"Committee--a group of men who individually can do nothing but as a group decide that nothing can be done." - Fred Allen

Re: Timers in MFC

BoudewijnEctor4-Oct-03 9:15

BoudewijnEctor

4-Oct-03 9:15

Thanks you everybody; after reading your hints, I finally succeeded in building this part of the app!
Poke tongue | ;-P

;)

Checking to see if filename entered

NewHSKid4-Oct-03 5:33

NewHSKid

4-Oct-03 5:33

Hi all,

I am having trouble coding this and wanted to know how to check if a user enters a filename to open. Basically I want to check to make sure the file name is not all spaces and that it is not blank. I am not using CFileDialog right now, just have a editbox and a browse button that i got from a CP article.

Does anyone have code out there that does this? Can someone lead me in the right direction?

Thanks for all your help .

Jimmy

Just cause I am 15, doesn't mean I'm dumb! (I'll really be 4 on Feb. 29...the year 2004)

Re: Checking to see if filename entered

Terry O'Nolley4-Oct-03 6:26

Terry O'Nolley

4-Oct-03 6:26

You can get at the string in the edit box with

CString FileName;

MyEditCOntrol.GetWindowText(&FileName);

You can then perform all of the validation on FileName.

To verify the edit box wasn't blank:

if(!FileName.Getlength())
//handle error here - zero length filename

To verify that no illegal filename characters were entered:

CString InvalidFilenameChars = ""; // put all invalid filename chars in this string

if(FileName.FindOneOf(InvalidFilenameChars) != -1)
//handle error here - filename contains invalid character

There may be a pre-built MFC way of handling all of this.........

Information extraction

Member 6221644-Oct-03 5:15

Member 622164

4-Oct-03 5:15

:(hello

I need the source code in c++, for information extraction from html tables , and to generate with those data a XML document.

Please help me

Marco Javier Suarez Baron

Re: Information extraction

Neville Franks4-Oct-03 11:48

Neville Franks

4-Oct-03 11:48

One way is to use the MSHTML control and iterate the HTML Elements. Have a look at the articles here on using the HTML control and on MSDN.

Another option is HTMLTree http://homepage.mac.com/pauljlucas/software/html_tree/[^] however this is GPL, which may be a problem for you.

And finally Google search: HTML parser.

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Type Variable

Aidman4-Oct-03 5:09

Aidman

4-Oct-03 5:09

Hi,

I am in need of a variable that can hold a type (variable-type ex: int or double) and not a value of the specific type, just the type. Something that works like this:

VARTYPE Type;

Type = int; // The type is integer.

switch (Type) {
	case short: // The type is short.
	//...
	break;
	case int: // The type is integer.
	//...
	break;
	case float: // The type is float.
	//...
	break;
	case double: // The type is double.
	//...
	break;
}

I know I can simply declare a bunch of constant numbers, who each represents a variable type. But that would be very non-optimal if there already exists an easier way. Could I use templates to achieve this or the use of preprocessors/macros? Just to be clear, I am looking for a variable that only contains a type and not a value.

Any help or tips are most appreciated. Smile | :)

Aidman » over and out
We haven't inherited Earth from our parents, instead we have borrowed her from our children; an old Indian saying.

Re: Type Variable

includeh104-Oct-03 5:22

includeh10

4-Oct-03 5:22

almost:
switch(sizeof(type))
{
case sizeof(short): //need pre-defined
break;

includeh10

Re: Type Variable

Ian Darling4-Oct-03 5:27

Ian Darling

4-Oct-03 5:27

In most 32 bit C++ compilers, float and int are both sizeof 4, so how's that going to work?

--
Ian Darling
"The moral of the story is that with a contrived example, you can prove anything." - Joel Spolsky

Re: Type Variable

Ian Darling4-Oct-03 5:30

Ian Darling

4-Oct-03 5:30

Off the top of my head, I believe some of Andrei Alexandrescu's work (Loki??) covers situations like this, although I don't have a reference to hand.

Also, the VARIANT struct already has some associated defines that could be used as a base for this - eg VT_I4, VT_UI1, VT_BSTR, etc...

--
Ian Darling
"The moral of the story is that with a contrived example, you can prove anything." - Joel Spolsky

Re: Type Variable

Neville Franks4-Oct-03 11:53

Neville Franks

4-Oct-03 11:53

There is also Boost Any which may be of interest: http://www.boost.org/doc/html/any.html[^]

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Re: Type Variable

Michael Dunn4-Oct-03 6:42

Michael Dunn

4-Oct-03 6:42

Look up typeid and the type_info struct

--Mike--
Ericahist | Homepage | RightClick-Encrypt | 1ClickPicGrabber
CP SearchBar v2.0.2 released

Re: Type Variable

Ian Darling4-Oct-03 7:57

Ian Darling

4-Oct-03 7:57

I forgot about those Blush | :O

Obviously been too long since I did any major work in C++. Of course, IIRC, typeid and type_info are platform dependant, so code isn't necessarily portable, right?

/goes into a bunker with a C++ compiler and a copy of Stroustrup.

--
Ian Darling
"The moral of the story is that with a contrived example, you can prove anything." - Joel Spolsky

Re: Type Variable

Michael Dunn4-Oct-03 8:05

Michael Dunn

4-Oct-03 8:05

Ian Darling wrote:
Of course, IIRC, typeid and type_info are platform dependant, so code isn't necessarily portable, right?

Not sure what you mean... Comparing type_infos generated on two different platforms probably won't work, if that's what you had in mind.

--Mike--
Ericahist | Homepage | RightClick-Encrypt | 1ClickPicGrabber
CP SearchBar v2.0.2 released

Re: Type Variable

Ian Darling4-Oct-03 8:12

Ian Darling

4-Oct-03 8:12

Michael Dunn wrote:
Not sure what you mean... Comparing type_infos generated on two different platforms probably won't work, if that's what you had in mind.

Nope. Just that you couldn't rely on certain things about the type_info implementation always being the same across platforms, for example, what typeinfo::name() returns.

My reading of "Design and Evolution of C++" suggests that there is scope for differing definitions of the type_info class on different C++ platforms.

--
Ian Darling
"The moral of the story is that with a contrived example, you can prove anything." - Joel Spolsky

Re: Type Variable

Michael Dunn4-Oct-03 8:21

Michael Dunn

4-Oct-03 8:21

Ok, I see. Honestly, I've never used type_info so I'm just repeating the docs here. Wink | ;)

--Mike--
Ericahist | Homepage | RightClick-Encrypt | 1ClickPicGrabber
CP SearchBar v2.0.2 released

Re: Type Variable

Aidman4-Oct-03 8:29

Aidman

4-Oct-03 8:29

Thanks! Althougth I am not quite sure if I might be able to use it as I hoped, it is still a better alternative then declaring your own Type-Ids. Smile | :)

Aidman » over and out
We haven't inherited Earth from our parents, instead we have borrowed her from our children; an old Indian saying.

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