C / C++ / MFC

AlexO13-Jan-03 3:17

AlexO

13-Jan-03 3:17

Describe the wrapper. What is wrong with "#import", why do you need your own?

VinZ13-Jan-03 3:22

13-Jan-03 3:22

Currently, I use the visual context to "insert" an acitvex control in my project, in class wizard visual build automatically the wrapper that make me have access to the methods and properties of my activex, without need to insert it as a part of the project.

when I had new methods and properties in the activex (other project) I don't, the wrapper in the project that uses the activex doesn't include new methods and properties...and so I have to suppress it and recreate....

Thanks for your help.

VinZ

Roger Stewart13-Jan-03 7:22

Roger Stewart

13-Jan-03 7:22

VinZ wrote:
Currently, I use the visual context to "insert" an acitvex control in my project, in class wizard visual build automatically the wrapper that make me have access to the methods and properties of my activex, without need to insert it as a part of the project.

when I had new methods and properties in the activex (other project) I don't, the wrapper in the project that uses the activex doesn't include new methods and properties...and so I have to suppress it and recreate....

The easiest way that I have found to upgrade the MS generated wrappers is to create a throw-away MFC application EXE project and insert the ActiveX control as you described. Then take the new generated wrapper cpp/h files from the throw-away project directory and copy them into your development project replacing the previous version of the files. You then have access to the new methods, events, etc. without dropping all references and re-inserting.

The bad thing is that you have to create a new throw-away project each time a new version of the ActiveX component that contains new methods, events, etc. is created or released. However, this technique is much faster than suppressing and recreating.

Roger Stewart
"I Owe, I Owe, it's off to work I go..."

VinZ13-Jan-03 21:18

13-Jan-03 21:18

Thanks, I going to do that, it seems to be the best time saving solution to find.
Bye.

VinZ

includeh1013-Jan-03 4:01

13-Jan-03 4:01

dynamically use ActiveX/COM will not cause your case.

"dynamically" means 2 ideas:
1. use #import, but u have to re-compile if need upgrad.
2. use LoadLibraryEx with Invoke method, u even don't need to re-compile ur exe to upgrad.

but, in both cases, use COM is better, do not use ActiveX.
ActiveX is not really "very standard" as COM is.

idea 2 needs much more knowleges than idea 1.

if insist using wrapper classes, delete all of them if need upgrad, new classes will be re-generated when add the control.

includeh10

VinZ13-Jan-03 4:18

13-Jan-03 4:18

Thank you for those lighting advises...

But a question: maybe it is more difficult to build a com project than an activeX one, I mean in time and volume of code to produce ?
I don't have a lot of time to supply a prototype of the implementation of my project, even if I agree with you concerning the better quality of a com project.

Thanks for all.

VinZ

includeh1013-Jan-03 5:43

13-Jan-03 5:43

in ur case, the COM (full control) is just a little bit harder than ACtiveX - it is worth to spend few hrs to learn.

but dynamical methods are quite trick: microsoft calls them "language indepandent", actually just can be used in VB and C++ (much more trick if in java).

once our lovely C++ downs toword VB, it becomes worse, that is why advanced c++ programmers don't like COM at all even they have to use and may be experts on COM.

includeh10

???:)

AlexO13-Jan-03 6:45

AlexO

13-Jan-03 6:45

???

VinZ13-Jan-03 21:17

13-Jan-03 21:17

I realy thank you for advises. and so I don't know if for my actual project (it's a shame) I will use the com techno, but maybe sooner in an other project for which I will get some more time to do.

I have, if you have time to answer me, a little more question. What do you think about .net services (web services) compared to the com techno to allow access to several resources through the network ?

VinZ

Help me please!!!

DRemedi13-Jan-03 2:45

DRemedi

13-Jan-03 2:45

Hi,
I have developed a dialog based application under W2k using Visual C++ 6.0 to print a table. In W2k and Windows XP professional works well, but it doesn't work in W9x & WMe. I'm using MM_ISOTROPIC map mode because I need to print some graphics. In W9x and WMe, when I print, I haven't obtain any results. I thought, "I'm doing something wrong", so I generate a SDI with Print Preview option and I wrote inside OnDraw(...):

....
pDC->SetMapMode(MM_ISOTROPIC);
pDC->Rectangle(100,-100,300,-300);

then I executed the program, I choose Print Preview from File menu. The Print Preview showed me a sheet with a rectangle. I printed this and i obtained the same results. Everything its Ok under W2k and WXP, but in W9x and WMe it's a disaster.

Can somebody help me!!!!!

Thanks.

Daniel Remedi
ARGENTINA
dremedi@hotmail.com
or
dremedi@cheeseinteractive.com.ar

Re: Help me please!!!

Nitron13-Jan-03 3:35

Nitron

13-Jan-03 3:35

What does your print code look like?

Where is your:

cdc.StartDoc(pinfo);
cdc.StartPage();
...
cdc.EndPage();
cdc.EndDoc();

Are you attaching your DC properly? Are you rendering correctly?

- Nitron

"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb

Callback

Mad Docs Hairy Belly13-Jan-03 2:44

Mad Docs Hairy Belly

13-Jan-03 2:44

Could someone please help! I dont seem to be able to find anywhere that explains how to use callback functions with in MFC.

Being an MFC novice I'm a bit stuck. I get the idea behind it, but I dont understand how to code it. How are static functions used in callbacks?

Would appreciate some idiot-proof help from someone who understands it all.

Thanks,

Re: Callback

includeh1013-Jan-03 3:44

Re: Rich Edit Control Bug??

13-Jan-03 3:44

How are static functions used in callbacks?

whole process of MFC is exactly as Win32 story.

key part to develop a lib as MFC is not "How are static functions used in callbacks", but how are classes connected to a cllback function (it is not a class member even it can be static function of a class).

view Windows' creation if interested - pass class pointer as parameter, otherwise just use MFC as it is - callbacks are hidden behind somewhere.

includeh10

Re: Callback

Mad Docs Hairy Belly13-Jan-03 4:56

Mad Docs Hairy Belly

13-Jan-03 4:56

What I'm trying to do is to read in a MIDI file (That works no probs), then during the playback go through each instrument, and create alist of events to be outputted, then call back to a function inside my View class to output the messages. However code that works on the same lines uses callback functions they have written themselves, and I can't seem to find anywhere that really explains whats going on in the code. I've tried writing static functions that deal with the callback, but since I'm not too sure whats going on I get errors.

Really could do with an article that explains how to do the call back syntax.

Does anyone know where I could find one. Can't find much in MSDN.

Re: Callback

valikac13-Jan-03 9:05

valikac

13-Jan-03 9:05

For MFC's AfxBeginThread() I recommend a global function.

AfxBeginThread() :: UINT theCallBackFunc(LPVOID lParam);

For C++ thread callback I recommend a static function.

_beginthreadex() :: static unsigned __stdcall theCallback(void *pParam);

Kuphryn

scollbar question

dan o13-Jan-03 2:29

dan o

13-Jan-03 2:29

hi,

I have a formview (in splitter window)

after OnInitialUpdate()

i do a load bitmap, but the size of bitmap is greater than the form
i like to draw scrollbars of the formview

m_static_picture.GetWindowRect(&rect); //beholder of bitmap
GetWindowRect(&rectWindow);
if(rectWindow.bottom < rect.bottom)
{
//to small a scroll bar is needed
int cx = rectWindow.Width();
int cy = rectWindow.Height();
int iDif = rect.bottom - rectWindow.bottom;
cy += iDif;

ScreenToClient(&rectWindow);
SetWindowPos(this, 0, 0, cx, cy, SWP_NOMOVE);
}

i wonder why this code is not working (i see no scollbar)

even if after adding

SCROLLINFO si;
GetScrollInfo(SB_VERT,&si);
si.nMin = 0;
si.nPage = rectWindow.Height();
si.nMax = cy;
si.nPos = 0;
si.nTrackPos = 0;
si.fMask = SIF_ALL;
si.cbSize = sizeof(si);
SetScrollInfo(SB_VERT, &si, TRUE);
ShowScrollBar(SB_VERT, TRUE);

give no result,

any ideas??
dan oudijk
Confused | :confused:

Re: scollbar question

lucy13-Jan-03 6:57

lucy

13-Jan-03 6:57

after you loaded your bmp, if the image dimesion of this bmp is imageWidth x imageHeight, try the following code:

CSize sizeTotal;
sizeTotal.cx = imageWidth;
sizeTotal.cy = imageHeight;
SetScrollSizes(MM_TEXT, sizeTotal);

Rich Edit Control Bug??

RChin13-Jan-03 0:40

RChin

13-Jan-03 0:40

Hola,
I'm wondering whether any of you gurus out there have ever come across this problem before.
Our company develops and have been using this data processing software for a while now. However, last week when a sister company tried to run the software, it bombed.
After much testing, we found that the bug was due to the Rich Edit control embeded in a particular view.

Now this is the weired bit. We have used the rich edit control (via loading the RichEd32.dll) with success, but this bug occurs when we try to use the control via the Rich Edit control provided by Visual Studio.
It ran fine on our side, but crashes on there machine! Yes I know of the 'works on my system' headache, but this really is puzzling! :<

Anyone know of any problems or specific requirements why this would happen specifically to the riched control placed on the dialog via the resource editor?

Using VC6. Compiled on Win2k.

one ring to rule them all

AlexO13-Jan-03 3:28

AlexO

13-Jan-03 3:28

I am not sure what you mean "Rich Edit control provided by Visual Studio", it is still RichEd32.dll is not? "Works for me" usually solved using depends.exe and oleview.exe; make sure that whatever your program depends on is installed on the user's computer. My guess is you just switched to VC7 and forgot to ship new dlls for MFC, CRT, and STL.

format of jar file

includeh1013-Jan-03 0:00

13-Jan-03 0:00

i need to know format of jar file.

i.e. zip file is in a set of structs: local_file_head, central_file_head etc.

jar file should be in a set of structs also, but i can't find any info about it.

any hints and links is wanderful.

thx in advance.

includeh10

Re: format of jar file

Jon Hulatt13-Jan-03 0:56

Jon Hulatt

13-Jan-03 0:56

I'd start at java.sun.com . Why do you need to know the format? can't you just use sun's jar tool to unpack it.

#include <beer.h>

Re: format of jar file

includeh1013-Jan-03 2:40