.resX file question?? - Managed C++/CLI Discussion Boards

toxcct3-Aug-05 22:22

3-Aug-05 22:22

int* a; declares a as a pointer to an int.

a = new int[50] allocates an array of 50 int, and then returns the address of the array in memory into a.

then, you can code a[1] to access the 2nd cell on the array.

if you wanted an array of pointers to int, you should write this :

int* a;
a = new int*[50];

cheers,

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: C++ Question

Anonymous4-Aug-05 8:23

Anonymous

4-Aug-05 8:23

Not quite. That would be:

<br />
// 50 new pointers to integers.<br />
int **a = new (int *)[50];    // Parentheses might not be necessary.<br />
<br />
int *b = a[0]; // Assign one element of the array to an int pointer.<br />
<br />
int c = 0; // New integer on the stack<br />
<br />
b = &c; // Assign a value to the pointer.<br />
<br />
a[0] = &c; // Same effect as the above line.<br />
<br />
*b = 5; // Assign a value to the integer pointed to by b.<br />
<br />
*(a[0]) = 5; // Same effect as the above line.<br />

(Note: I wrote this code in the input box and didn't compile it to double-check if it works, so if I got something wrong please correct me.)

Like the other posters said, the code "int *a = new int[50]" allocates an array of 50 integers on the heap and assigns a to the address of the beginning of that array.

Re: C++ Question

DiscoBall134-Aug-05 16:30

DiscoBall13

4-Aug-05 16:30

Thank You very much I wish I would of found this site Last year because I Graduated today from Farmingdale suny I thank all comrades of this site Thank You Laugh | :laugh:

Array Pointer math

mikesys3-Aug-05 9:39

mikesys

3-Aug-05 9:39

Question:
typedef void (* FUNCTION_PTR) (float*, float**); //.h
float InArray[10];
float* OutArray[5];
float first_element, second_element;
(*FUNCTION_NAME)(InArray, OutArray); //Calls the function
OutArray_first_element=??????????????//how do I access Out Array elements?
OutArray_second_element=????????????//how do I access Out Array elements?

Thanks, Mike

Re: Array Pointer math

Christian Graus3-Aug-05 13:24

Christian Graus

3-Aug-05 13:24

OutArray[0][0] gets the first element.

OutArray[0] gives you the first array, then the second [0] indexes it. You have an array of arrays there. The real question is how do you know the dimensions.

Christian Graus - Microsoft MVP - C++

Re: Array Pointer math

Anonymous3-Aug-05 14:23

Anonymous

3-Aug-05 14:23

OutArray has a size of 8 and all are floats.
InArray's (float) size I control. I can only access the
app through this DLL, so I can't see their dimensions and typing.
I see the first OutArray element
just fine. I've tried many dereferencing and array
indexing tricks and I still see no data on the other elements,
assuming I'm hitting them. Any other ideas?

Can you assume an dimension and give me an example
to be sure I've got it right?
Thanks, Mike

Re: Array Pointer math

Christian Graus3-Aug-05 14:30

Christian Graus

3-Aug-05 14:30

Well, you need to do OutArray[0][x], because it's a ** ( assuming that it's an array of 8 dimensions that was passed in as a pointer ). If that doesn't work, then something else is broken.

Christian Graus - Microsoft MVP - C++

.resX file question??

richiemac2-Aug-05 23:21

richiemac

2-Aug-05 23:21

Hi all,

I've got an application that I've added language capabilties by means of resource files and cultures. This works ok and I have no problem with it what-so-ever. I now want to add another resource that holds all the images my application will use. My problem comes whenever I try to use the resource. My app complains about the images resource or when I manage to sort that problem it complains about the language resource.

I have had both working on occasion but it seems to be very flakey and sometimes chooses not to work for no apparent reason other than the project being closed over night. Could someone explain to me the exact way in which to add .resX files to projects and what setting should be set in the project configuration because I think I may have misunderstood the process somewhere along the road.

Thanks in advance.
Richie

Re: .resX file question??

ursus zeta7-Aug-05 10:11

ursus zeta

7-Aug-05 10:11

I've been reading about this recently in Chris Sells book, "Windows Forms Programming in C#". He has a 30 page chapter on the subject in which he describes in detail how to embed resources into a .NET Framework executable.
The process is a little different in C++, and. in all probability, depends on which version Visual Studio .NET you are using.
If you haven't tried it already, what happens when you open the compiled executable in Ildasm.exe? The manifest should show your resources and the associated namespaces. This is from Chris's book: "To check that a file has been embedded properly into your project's output assembly, you can use the .NET Framework SDK tool ildasm.exe. This tool shows all embedded resources in the Manifest view of your assembly".
Depending on the method that you used to embed the resource, he goes on to describe the process that Visual Studio .NET uses to assign the default namespace and the actual path to the resource. He also points out that building your project causes the .resx data to be embedded as nested resources, which are resources grouped into a named container. He then goes on to describe several methods for loading these resources.
You don't say in your post, but, how are you attempting to access these resources?

Re: .resX file question??

richiemac7-Aug-05 21:54

richiemac

7-Aug-05 21:54

Thanks for the pointer. I think it was to do with the project configuration. I went through it and changed it where required and it seems to be ok (for now...). I had to change the resource output file names in configuration. I now know to use the ildasm.exe to see if they are being embedded correctly.

Thanks again.

Oh and I was using the ResourceManager class to access them.

Using C++ libraries in C application

lata07mahi2-Aug-05 2:07

lata07mahi

2-Aug-05 2:07

I have C++ libraries which i want to use in C application. Confused | :confused:

Please help.

Lata Agrawal

Re: Using C++ libraries in C application

Nemanja Trifunovic2-Aug-05 2:55

Nemanja Trifunovic

2-Aug-05 2:55

You need to "flatten"[^] the C++ classes to use them from your C code.

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

how to write an avi file

limra1-Aug-05 22:07

limra

1-Aug-05 22:07

hi,
I have a set of avi files how I can I read one avi and write the video and audio assoiated with that avi to another new avi(to be created).

and also let me know how to join to avi,s in c++(vc++/borland c++)

regards
shaan

Re: how to write an avi file

ursus zeta2-Aug-05 9:19

ursus zeta

2-Aug-05 9:19

DirectShow has a number of APIs desined specifically for this purpose.
You'll find that it's not really a simple, intuitive process, though.
If you can locate the SDK tools that come with the DirectX SDK, there should be one known as: GraphEdit.exe
Using DirectShow[^]

playing sound in C++

snibster1-Aug-05 4:14

snibster

1-Aug-05 4:14

How does one go about playing an audio file in C++? Is there any way to use mp3's?

Candz

Re: playing sound in C++

Anonymous1-Aug-05 7:09

Anonymous

1-Aug-05 7:09

http://www.codeproject.com/audio/mp3player.asp

Re: playing sound in C++

Laffis5-Aug-05 2:43

Laffis

5-Aug-05 2:43

what about more advanced features? e.g. how do you continuously play a file? I found mciSendCommand(), but cannot work out the device id (i am not a multimedia programmer thus not familiar with these stuff Sigh | :sigh:

)

with wav file functions, you can ask the system to play the sound in a loop...

Re: playing sound in C++

Laffis5-Aug-05 1:13

Laffis

5-Aug-05 1:13

If you just want to play a simple wav file, try ::PlaySound(...). very simple Big Grin | :-D

include file:
<mmsystem.h>

Specialization for ref classes

S. Senthil Kumar31-Jul-05 8:45

S. Senthil Kumar

31-Jul-05 8:45

I was just playing around with the VC++ Express, mixing up template code and managed classes. I wasn't able to figure out how to write a template class (managed or unmanaged) that can work with both managed and unmanaged classes. Is it even possible?

There are obvious syntactic differences, for eg, it's T * for unmanaged and T ^ for managed classes.. I tried specializing the template for managed classes, but then couldn't figure out how.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Specialization for ref classes

Christian Graus31-Jul-05 20:06

Christian Graus

31-Jul-05 20:06

managed C++ probably uses the .NET framework for templates. and they can't be specialised.

Christian Graus - Microsoft MVP - C++

Re: Specialization for ref classes

S. Senthil Kumar31-Jul-05 21:17

S. Senthil Kumar

31-Jul-05 21:17

But aren't templates compile time thingies? I guess they only need to be supported by the compiler and no runtime support is required. Generics, yes, but templates, I don't think so.
What I wanted to do is to write a template class that can take both managed and unmanaged types as type parameters. Is there any other way it can be done?

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Specialization for ref classes

Christian Graus1-Aug-05 11:38

Christian Graus

1-Aug-05 11:38

Sorry - I guess I misunderstood you.

Christian Graus - Microsoft MVP - C++

Re: Specialization for ref classes

Nemanja Trifunovic1-Aug-05 3:30

Nemanja Trifunovic

1-Aug-05 3:30

You'll need partial template specialization for this to work. Ie:

#include <vcclr.h>

using namespace System;

template <typename T> class TestClass
{
T member;
public:
TestClass (T mem) : member (mem){}
};

template <typename T> class TestClass<T^>
{
gcroot<T^> member;
public:
TestClass (T^ mem) : member (mem){}
};

int main(array<System::String ^> ^args)
{
TestClass<String^> tc(gcnew System::String(L"something")); //managed
TestClass<int> tn(1); //native
return 0;
}

<hr>
<a href = http://www.codeproject.com/script/profile/whos_who.asp?id=14112#Blog> My programming blahblahblah blog</a>. If you ever find anything useful here, please let me know to remove it.

Re: Specialization for ref classes

S. Senthil Kumar1-Aug-05 3:56

S. Senthil Kumar

1-Aug-05 3:56

Oooh ok. I did try partial specialization, but I didn't get the syntax for specializing for managed classes (T^). I guess the syntax is the same as for specializing for T*.

Thanks a lot.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

'Initialisation is Resource Acquisition' can someone please shed some light on it.

Sandeep Datta28-Jul-05 8:12

Sandeep Datta

28-Jul-05 8:12

Dear fellow CPians,
I am perplexed as to what's the fuss about a trivial phrase like 'Initialisation is Resource Acquisition'. I would be grateful if some kind enlightened soul could shed some light on it. What does it signify?

SDX-{5A853460-2944-42f8-84B8-2432DE3657EF}

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