Managed C++/CLI

14-Jun-04 5:56

I am just beginning to get into designing (hand-coding) forms with .Net using C++. I am trying to write a very simple application that has buttons on it and draws a black ball every 10 milliseconds that bounces around the screen which I plan to use to learn more about programming in .Net and as a reference for future programs. I placed every function and variable in a single class (except the main() function) that extends the Form class. I placed a call to Invalidate(), Update(), and Sleep(10) (in that order) in an idle function which I then used as the function to handle the Application Class's Idle event. The program does draw the black ball properly and does call the idle function but it only calls it after another event occures (such as when the mouse is moved over the form). I was wondering whether anyone could either tell me a way to fix this problem so that the black ball is drawn and moved every 10 milliseconds or provide me with a better way to do this. Any help on this would be greatly appriciated.

palbano14-Jun-04 6:14

14-Jun-04 6:14

You could use a high resolution timer to drive the animation if you have hardware that supports it. Otherwise you could use a secondary thread that calls ::Sleep(10)

"No matter where you go, there your are." - Buckaroo Banzai

-pete

magefire14-Jun-04 6:21

14-Jun-04 6:21

Thank you very much for your prompt response but as I said, I am just getting started with .Net so could you please clarify exactly how I would do this. Thanks in advance for any help on this subject.

palbano14-Jun-04 6:29

14-Jun-04 6:29

http://www.thecodeproject.com/csharp/highperformancetimercshar.asp[^]

Similar resources and samples can be found for creating/using multiple threads using the .NET platform.

"No matter where you go, there your are." - Buckaroo Banzai

-pete

magefire14-Jun-04 6:51

14-Jun-04 6:51

Thanks for the information and I tried implementing it in the paint event handler as shown below:

<br />
void formOn_Paint(Object* sender, PaintEventArgs* e)<br />
{<br />
    ... //Code for drawing and moving around the black ball.<br />
    Invalidate(); //Send paint message<br />
    Update(); //Repaint the scene.<br />
    System::Threading::Thread::Sleep(10); Sleep for 10 milliseconds.<br />
}<br />

Unfortunately, this code makes the program run extremely sluggishly and I have a new computer with a Pentium 4 so I really doubt it is the hardware. I used to have this code done in the application's idle handler (the drawing and moving of the black ball was still handled in the Form's paint event handler) as shown below:

<br />
void onIdle(Object* sender, EventArgs* e)<br />
{<br />
    Invalidate();<br />
    Update();<br />
    System::Threading::Thread::Sleep(10);<br />
}<br />

Both of these functions are members of the class that is used as the parameter to the Run() function of the Application class so the keyword 'this' is implied when referring to the functions Invalidate() and Update().
Thanks in advance for any help you can provide me with on this subject.

palbano14-Jun-04 7:52

14-Jun-04 7:52

>> you could use a secondary thread that calls ::Sleep(10)

You are calling sleep in the primary or UI thread. That is NOT a secondary thread and it is just not going to work very well.

-pete

magefire15-Jun-04 4:50

SHGetFolderPathW function syntax - question

15-Jun-04 4:50

Thank you very much for your help, that solved my problem.

Stanimir_Stoyanov14-Jun-04 5:21

Re: SHGetFolderPathW function syntax - question

14-Jun-04 5:21

i need to know what the nFolder variable for the value "56" is in the function SHGetFolderPath

HRESULT SHGetFolderPath( HWND hwndOwner,
int nFolder,
HANDLE hToken,
DWORD dwFlags,
LPTSTR pszPath
);

i browsed msdn, but there was no variable with such value,
pls help
thanks in advance

palbano14-Jun-04 6:10

disassembling (correctly) managed c++ assemblies?

14-Jun-04 6:10

from ShlObj.h

#define CSIDL_RESOURCES 0x0038 // Resource Direcotry

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Stanimir_Stoyanov14-Jun-04 5:20

Re: disassembling (correctly) managed c++ assemblies?

14-Jun-04 5:20

my problem is disassembling managed c++ assemblies, so that when i try to re-compile the IL i don't get errors for functions, containing 'modopt' in their name.

If you can, please tell me how to disassemble such .net assemblies.

Thanks in advance,
Stan

cppmanuf25-Jun-04 18:03

cppmanuf

25-Jun-04 18:03

Do you have a code sample that reproduces the problem? It sounds like a possible ildasm bug.

Matt
Visual C++ FE

Re: disassembling (correctly) managed c++ assemblies?

Stanimir_Stoyanov27-Jun-04 9:03

Re: disassembling (correctly) managed c++ assemblies?

27-Jun-04 9:03

the assembly is just a managed c++ dll. when i disasemble it using ildasm, and (try) to re-assemble it with ilasm, the error functions' names both have 'modopt' and double dots.

i do think it's bug, too.

cppmanuf30-Jun-04 16:58

cppmanuf

30-Jun-04 16:58

Anything special about the functions that error? I'll check the bugbase.

Matt

Re: disassembling (correctly) managed c++ assemblies?

Stanimir_Stoyanov3-Jul-04 3:14

Help I want to change While loop to Nested for loo

3-Jul-04 3:14

well, i think some of the functions are native, and that's the prob

JawedVikia8010-Jun-04 21:51

JawedVikia80

10-Jun-04 21:51

Hi friends i am new to c++ and also in the forum this question is my
experiment .Now problem is that , i want to change the while loop to
the nested for loop.
The program's description is as follows :-
Writ a program for a Match stick game between the computer and user .
Program should ensure that the computer always wins .
Rules for the Game are as follows:-
-There are 21 match sticks.
-The computer asks the player to pick 1, 2 ,3, or 4 match sticks .
-After the person picks , the computer does its picking .
-However is forced to pickup the last match stick looses the game .
The programs code is as under

/*Match Stick Game */
# include <stdio.h>
# include<conio.h>
void main ()
{
int m = 21,p,c;
clrscr();
while(1)
{
printf("\n\nNo.of matches left = %d",m);

printf("\npickup 1,2,3,or 4matches");
scanf("%d",&p");
if(p>4||p< 1)
continue;
m = m -p;
printf("\n\nNo. of matches picked up %d",c);
m =m-c;
if(m== 1)
{
printf ("\n\nNumber of matches left %d" ,m);
printf("\nYou lost hte Game !!");
break;
}
}
printf("\n\n\n\n\nPress any key to Exit...");
getch();
}

Re: Help I want to change While loop to Nested for loo

Jon G11-Jun-04 1:21

Jon G

11-Jun-04 1:21

This sounds like homework to me Smile | :)

----------

int Value;<br />
<br />
for (int i = 21; i > 0; i=i)<br />
{<br />
   Console::WriteLine("Pick 1,2,3 or 4: ");<br />
   Value = Console::Read();<br />
   <br />
   if (Value <= 4 && Value >= 1)<br />
       i = i - Value;<br />
   else<br />
      Console::WriteLine("Not a valid choice");<br />
<br />
   if (i <= 0 )<br />
       Console::WriteLine("Game over");<br />
}<br />
<br />
<br />
Console::WriteLine("Press enter to continue");<br />
Console::Read();

Non-unicode to Unicode

ilkertanli9-Jun-04 19:25

ilkertanli

9-Jun-04 19:25

i am having issues while writing a file renamer program using borland c++. The problem is I can not replace non-unicode char to the unicode ones, for example i (not i) borland doesnt even let me to declare non-unicode chars.

If somebody has a clue or exprienced this before, please let me know.

Thnx...

Ilker TANLI
www.tanli.net

Quick and easy question

Adam Durity9-Jun-04 9:29

Adam Durity

9-Jun-04 9:29

Hey Guys,

I've been looking at things around the Internet and i'm seeing this:

String* s = S"Hello World!";

the 'S' that precedes the string, what does that do? Is it the same as the @ modifier in C#?

Thanks,
Adam

-- Adam

"If you can't beat your computer in chess, try kickboxing"

Re: Quick and easy question

palbano9-Jun-04 16:08

Conversion of Unmanaged COM in VC++ to Managed VC++ or C#

9-Jun-04 16:08

You probably already found this but just in case

http://www.codeproject.com/managedcpp/managed_types.asp[^]

pete

imran1899-Jun-04 2:55

imran189

9-Jun-04 2:55

I am in a migration project of conversion of COM components written in VC ++ to either Managed VC++ or C#.
Can anyone suggest me how to proceed with this.

Client wants to the development team to use some migration tool and convert it and after that rectify some minor errors and modifications.

I tried open the VC++ project in the MS Visual Studio.Net, but when I tried to build, it didn't worked out giving multiple errors for the header files.

Please suggest as I need to give some solution at the earliest.

Re: Conversion of Unmanaged COM in VC++ to Managed VC++ or C#

palbano9-Jun-04 5:49