C / C++ / MFC

Re: Problem with maximizing and minimizing window

15-Apr-02 4:17

Do your drawing in a handler for WM_PAINT (or WM_ERASEBKGND if you prefer). This handler will be called when your window needs a redraw. If you already have code for drawing your picture, move it there.

Paul M Watt15-Apr-02 4:20

15-Apr-02 4:20

Something else that you may want to do besides making your window update the photograph in the WM_PAINT handler, is setting the CS_VREDRAW and CS_HREDRAW flags for your main window, this wil force all of the children to fully repaint whenever the main window is resized.

Upgrading VC6 Apps To VC7

Li Mu Bai15-Apr-02 3:04

Li Mu Bai

15-Apr-02 3:04

Hi guys

I had a dialogue box app in VC++6 and then built it in VC++7
it asked me if i wanted to reformat the project and i pressed yes and built it in VC7, all was ok until i tried to run the app on a win98 machine, the CFileDialog would not work on a 98 machine it works on a 2000 machine Confused | :confused:

I then got a new app in VC7 and put CFileDialog in it but it worked on a 98 machine
im at a loss
Confused | :confused:

Wudan Master

Cryptography - Get private key from certificate

15-Apr-02 1:56

Hello!

I want to read the private key from a
certificate, but I don't know whici API
function do this. Also, as a derived
questions: where are stored private keys
in windows? Which is the location?
Can I read them, and in which conditions?
Are there special API's? (I just vaguely heard
about CryptoAPI.)

Anyone experienced here?

Thanks,
Don Miguel

Re: Cryptography - Get private key from certificate

Paul M Watt15-Apr-02 5:23

15-Apr-02 5:23

I do not think that the private key is stored in the certificate, the private key is a secret that only the owner knows about. Do you mean the public key?

Making new windows

Dor15-Apr-02 1:35

Dor

15-Apr-02 1:35

Hi,
Im building a single document application and i want to bring up a new dialog box that is a new window, ie. has its own little bar at the bottom of the screen. Can anybody help?
Cheers
Dor

Re: Making new windows

Gianfranco Lanzetta15-Apr-02 1:52

Gianfranco Lanzetta

15-Apr-02 1:52

I haven't notebook on head but:
If you use VisualC++, you can develop this application imedialitly with

i)File->New...
ii) MFC Application

at this point you follow step to step...

this's your simgle document application...

For viewing a dialog you must write:
CDialog dialog;
dialog.domodal();

Gianfranco Lanzetta.

Re: Making new windows

Paul M Watt15-Apr-02 5:27

15-Apr-02 5:27

You will want to use CreateDialog to create your dialog and make it appear modelessly, if you are using MFC, you can create an instance of your dialog object, then call the Create member, then the ShowWindow member. In order to make sure that it is in the task bar you will need to set the WS_EX_APPWINDOW style for your dialog.

newbie low-level mfc subclassing q.

SirMorrisBig15-Apr-02 1:17

SirMorrisBig

15-Apr-02 1:17

Hello all!

I'm writing an app which uses many mfc controls. I am using subclasses of ScrollBars and DialogBars, TreeCtrls and some raw CWnds each of which require a common set of properties and methods. It would appear that subclassing CWnd at the object (as opposed to HWND) level would be the ideal solution.

There's a couple of ways I can think of to achieve this, but I was wondering if anyone has solved this more elegantly than I could.

One way I thought of would be to have all of my controls bolted onto a common placeholder class. Another would be to have an HWND->CWnd map and associate a class with each window which could be used to hold all my data. The final one would be to hook CWnd somehow and store a pointer to my data in one of the window data slots.

Any takers?!!

Thanks,

(C:=
Charlie.

Re: newbie low-level mfc subclassing q.

15-Apr-02 1:34

You may use the macro procedures in this way.

//this's link to param1=parent (container)
//and param2=child
inline macro_name(param1,param2){
//implementation
}
where parent contains a std::vector of child pointers;

this's is a solution.

gianfranco lanzetta.

???

15-Apr-02 1:12

,
I know this might sound incredibly dumb Confused | :confused:

, but what is c++? what is is used for? is this the best thing to build programs? what programs ?

Thanks for you time

Smile | :)

Re: ???

Paul M Watt15-Apr-02 5:33

15-Apr-02 5:33

It is a programming language. It is used for developing software of all types.

------------------------- wrote:
is this the best thing to build programs

It depends on the type of application that you are going to build. If you are going to do a large scale application, or something that requires a lot of speed or low-level access to memory, then C++ is an excellent choice.

If you are going to develop small simple programs, and I emphasize simple you could use Visual Basic, this is if your are developing for windows of course.

There are plenty of languages to choose from, mainly you should look at what the purpose of your program, where it will be used, which operating system and other factors like that before you decide on a language.

URGENT.... Can we invoke Apps from IE...

Naresh Mehta15-Apr-02 1:11

Naresh Mehta

15-Apr-02 1:11

Hi everybody,

Can we invoke local applications from IE ? And, can IE direclty invoke activeX components based on certain event....

Please reply...

Yours

Wolverine

visit me at:

http://www.futurecomputing.homestead.com/
http://www.futurecomputing.0catch.com/

templates

Gianfranco Lanzetta15-Apr-02 1:05

Gianfranco Lanzetta

15-Apr-02 1:05

this code don't work too good.
this is the question:

template<class type="">
int size(type x){return sizeof(x);};

or

template<class type="">
int size(type x){int _size=sizeof(x);return _size;};

Why this?
thanks a lot.

Niklas L15-Apr-02 1:25

15-Apr-02 1:25

Well, it should work, assuming <class type> was stripped by the html parser here.

template <class type>
int size(type x){return sizeof(x);};

has to be called like int sz = size<int>(8);, which is a bit strange.

You might want to write the function like:

template <class type>
int size(){return sizeof(type);};

instead. This way you will call it like int sz = size<int>();, which looks a bit better IMHO.

Niklas L15-Apr-02 1:27

15-Apr-02 1:27

Hehe, more stripping there. It should have read:
int sz = size<int>(8); and int sz = sizeX<int>(); Blush | :O

15-Apr-02 6:50

eheheh!!
I don't think that's right, because in this case ... try it:

#include "stdio.h"
template < class type > int size(){return sizeof(type);};

int main(int argc, char* argv[])
{
printf("%i\n",size <float>());
printf("%i\n",size <int>());
printf("%i\n",size <double>());
printf("%i\n",size <char>());
printf("%i\n",size <short>());
};

Gianfranco Lanzetta. Confused | :confused:

Niklas L16-Apr-02 2:12

icon won't execute my program

16-Apr-02 2:12

Hmm, yes why doesn't

template &tl; class type > int size(){return sizeof(type);};

work, while

template < class type > int size(type t){return sizeof(type);};

does? (Still without using the (t) argument, just specifying it is enough)
Smells like a compiler bug? Just tried it using gcc v2.95.4, and it gave the expected result. (4, 4, 8, 1, 2)
Using VC it seems like it always prints the value of the last used template parameter, in this case short, which gives 2 for all function calls.
Maybe someone with a copy of the ARM could explain how this is supposed to work.

15-Apr-02 0:56

Ok I have written an MS Dos exe with visual c++ but whenever I double click the icon the MS dos screen only flashes up for a second and then disappears. The program runs from the command line fine.
At the start the program is designed to simply print a usage message to the scren.

Klara

Orbital^15-Apr-02 1:16

Orbital^

15-Apr-02 1:16

This is what it supose to hapen ... the program it's executed, print the usage message and finish. When a program is finsih the window is closed by default

Bye,
Orbital^

...the night is long ... but not long enought to do some real coding ...

15-Apr-02 1:27

Its supposed to print the usage message and then wait for the user to type in the arguements it wants the program to use. Thats the way it works when executed from the command line. This is such a pain. I can't figure out how to fix it and I know it's something really simple.

But hey I supose it's only simple if you know how to do it.

Thanks anyway.

moliate15-Apr-02 2:22

moliate

15-Apr-02 2:22

If you set the program not to close on exit [Right-click => Program => Uncheck 'Close on exit'] what is the output? Do you get anything at all?

/moliate