Re: Small IVR Development - C / C++ / MFC Discussion Boards

Thanks a lot Hans

hello guys.. I am trying to make a small scale IVR which should be able to detect that which key was pressed from the caller. I dont know from where to start. Any kind of resources on web (site links, pdf/ppt file or some forum for beginners) would be appreciated. Smile | :)

what is IVR ?

Confused | :confused:

Watched code never compiles.

I'd guess this[^].

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Hi there,
If you're familiar with .NET, try VBVoice. VBVoice integrates with Microsoft Visual Studio and combines an easy-to-use visual call flow environment with fully programmable controls. It comes with a prompt library (English (UK & US), French, German, Italian, Japanese, Spanish (Castilian & South American) and sample applications to help you get started (tons of VB6, C# and VB.NET sample applications; e.g. help desk, speech attendant, fax service, predictive dialer, etc.)

You can download the full version of VBVoice for free here http://pronexus.com/index.php/software/download-free-ivr-software/[^]

Hope that helps Wink | ;)

Hi there...
Thanx for your answer and sorry for late reply if you get this message.
Do I need to get/buy any other extra hardware for this VBVoice to work?
I read about this before posting the question and I think we need to buy some kind of voice modem for this.
I just want to handle DTMF and an extra voice modem??...ehem ehem.

You are correct, you will require telephony media to connect the VBVoice application to the telephony infrastructure; VBVoice works with Dialogic media for the telephony connection. The Dialogic API integrates with VBVoice natively, so there is no extra programming required, in fact, once you have installed the Dialogic media and driver, you just select the media type in a VBVoice configuration; so the functions that VBVoice and Dialogic use to connect calls is really transparent to the programmer (and the caller).

You will need to determine the telephony protocol that will be available to the VBVoice/Dialogic IVR. This could be analog, T1 or E1 digital protocol, or even VoIP.

With analog and T1/E1 protocols you will required a Dialogic board/card, which comes as PCIU or PCI-Express (as you require). The Dialogic board in these cases have the resources required to conect a voice call, process DTMF, and additional features such as fax, conference, and speech recognition resources which are hardware-based, meaning the ability or resources are provided by the chipset of the Dialogic board. VBVoice taps into these resources to provide the funtionality to the application. The Dialogic board also facilitates the physical connection to your PBX or Telco which is providing the analog, or T1/E1 circuit.

In contrast, the Dialogic VoIP solution; Host Media Processing or HMP, does not require any Dialogic media board. Instead, the resources used to connect calls, process dtmf, fax, etc. is provided through specific Dialogic HMP licensing you purchase. The physical connection is the primary Network Interface Card of the IVR, and all call processing is done on the CPU of the server.

The advantages of a VoIP solution are that you can purchase a physically smaller server, such as a 1U rack server, since there is no requirement for a PCI board. The Dialogic PCI boards are all full length PCI boards, so are rather large. This is the case with all Dialogic boards we support, with the exception of the D4PCI boards which are half-length. Another benefit is that you only purchase the resources you need. Dialogic has a minimum initial order requirement of 4 channels, but you can increment this up at a later time as demand increases. Plus, you only buy the resources you need, so if you don't need speech recognition you would not buy the required Dialogic resource with HMP... if you purchase a PCI card, it may have the hardware-based resources which you will not neccessarily use in the application.

We have a list of the various Dialogic cards that VBVoice supports here: http://pronexus.com/index.php/services/support/supported-voice-cards/

If you have a particular protocol in mind, and a number of channels that the IVR will need to handle at any given time, I can provide some further advice on which Dialogic card would address your requirements.

can any one explain about the memory mapping of file what it does actually and how to use it...
please provide a example........

thanking you
sarfaraz

Memory mapping allows you to treat a file, or portion of a file, as an array of bytes, just like any other array in C/C++.

I suggest you read about it here[^], since it can be quite a complex topic.

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can i used it for reading the 64gb of data should i have to create the MMF and the i have to read ?......
here i am trying to take the c drives which of 64gb displaying in windows client area .for this how to create MMF and to Read. i know the function of MMF but not able to implement if in proper way give me example to create and read the data for particular on drives ...........

thanking you
sarfaraz

This is almost impossible to tell without knowing your data.

Do you have one 64GB file, or many smaller with a total of 64GB? Are they text or binary files?

If you want to display one big file in a window, you can map a portion of the file around the part you want to display, and read that information. But without knowing the data structure of your file(s), it's hard to tell how to sync data with display. E.g. if you have a text file, you might want to manage some line or character count to calculate which portion of the file to map. If it's structured binary, you need something similar.

Please give some info on what you have, and how you want it displayed.

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thanks
its is \\C: drive i am want to display in hexadecimal

as you usually read full sectors when accessing the hdd, you should use normal file i/o for it.
allocate a buffer that is big enough to keep the maximum amount of data the hex editor can display and read it from disk just the way you to with a normal file.

memory mapping 64gb can only work with 64-bit os, as it requires a very big virtual address space. but i haven't tried to map that much data so far.

Don't try it, just do it! Wink | ;-)

Here is a sample of how to map a small portion of a large file:

C++

const TCHAR* path = _T("C:\\file.dat");
DWORD maxBytesToMap = 64*1024;

// Open the file
HANDLE hFile = ::CreateFile(path, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, 0);

// Get file size for verification
DWORD fileSizeHigh;
DWORD fileSizeLow = ::GetFileSize(hFile, &fileSizeHigh);

// Create the file mapping for the entire file
HANDLE hShMem = ::CreateFileMapping(hFile, NULL, PAGE_READONLY, 0, 0, NULL);

// Create a smaller view at a specific region in the file
// fileOffsetHigh and fileOffsetLow is where the view should begin
unsigned char* pBytes = (unsigned char*)::MapViewOfFile(hShMem, FILE_MAP_READ,
                                 fileOffsetHigh, fileOffsetLow, maxBytesToMap);

// Read data from pBytes
for (size_t i = 0; i < byteCount; ++i)
    x = pBytes[i];

Error checking and clean-up omitted.

home

thanks

1)i tried but not able to understand what actually memory mapped file will do ....
2)i also studied in MSDN about this but i not understood the virtual address space ...
3)how it will access the data ......
please clear the above points.........

now see how i had written the code for this....
HANDLE hfile,hmapfile;
hfile = CreateFile(_T("C:\\saad.txt"),GENERIC_READ,FILE_SHARE_WRITE|FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);

if(hfile == INVALID_HANDLE_VALUE)
{
MessageBox(_T("Fail to open the drive"),_T(" "),MB_OK | MB_ICONERROR);
return -1;
}
DWORD filesize = GetFileSize(hfile,NULL);
hmapfile = CreateFileMapping(hfile,NULL,PAGE_READWRITE |PAGE_WRITECOPY |SEC_COMMIT |SEC_RESERVE,filesize,filesize,NULL);
if(hfile == INVALID_HANDLE_VALUE)
{
MessageBox(_T("Fail to open the drive"),_T(" "),MB_OK | MB_ICONERROR);
return -1;
}
DWORD pbuf = (DWORD) MapViewOfFile(hmapfile,FILE_MAP_COPY |FILE_MAP_ALL_ACCESS,0,filesize,filesize);

one more thing i want ask should i have read the file with Readfile ???

sarfaraznawaz wrote:
1)i tried but not able to understand what actually memory mapped file will do ....

A memory mapped file is faster than than reading a file the conventional way. On the other hand, if you are reading/writing text, you will not benefit from having end line characters translated correctly for you, and have to do that manually.

sarfaraznawaz wrote:
2)i also studied in MSDN about this but i not understood the virtual address space ...

The virtual address space is nothing you have to worry about yet. It is the memory your process is able to read. The operating system will help you take care of business. However, a 32 bit application can never address more space than can be stored in a 32 bit unsigned type variable. This is why mapping 64Gb data all at once will be a problem.

sarfaraznawaz wrote:
3)how it will access the data ......

You access the data just as any other C/C++ array, by offsetting the returned pointer from MapViewOfFile().

sarfaraznawaz wrote:
one more thing i want ask should i have read the file with Readfile ???

It looks like using ReadFile() would be a dead end if you want to display the entire file. My guess is that you will suffer from real performance problems.

home

thanks
i mapped the file but not able to display whole file in the window

You should only display a small portion of the file at any one time. You don't need to show more than fits (+ maybe a little extra for performance)

The user won't notice since he/she cannot seethe whole file anyway. Manage scrollbars manually.

home

thanks again ...
but i not understand clearly the parameter DWORD dwMaximumSizeHigh,
DWORD dwMaximumSizeLow in CreateFileMapping(......)

even in PVOID MapViewOfFile(DWORD dwFileOffsetHigh,DWORD dwFileOffsetLow,)not understood ..
please clear it ....

Your DWORD is a 32 bit unsigned integer. That means it can store values up to 4 * 1024 * 1024 * 1024. You cannot point to anything higher than that in your file by just using one DWORD. This equals 4GByte. To be able to read data from a file larger than 4Gbyte, you will have to make use of the dwFileOffsetHigh, which simply speaking is the index of the 4Gbyte block in the file you want to read. For the first 4Gbyte, dwFileOffsetHigh should be zero, for the next 4Gbyte data, ranging from 4Gbyte to 8Gbyte, it should be 1, and so on. You have to do some simple math there to calculate the correct offset for your desired view.

home

thanks ....
i written the code which is to read the c:drive its showing the bad pointer here my code

hfile = CreateFile(_T("\\\\.\\C:"),GENERIC_READ,FILE_SHARE_WRITE|FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
DWORD filesizeLow = GetFileSize(hfile,&fileSizeHigh);
HANDLE hmapfile = CreateFileMapping(hfile,NULL,PAGE_READONLY ,0,0,NULL);
if(hfile == INVALID_HANDLE_VALUE)
{
MessageBox(_T("Fail to open the drive"),_T(" "),MB_OK | MB_ICONERROR);
return -1;
}
CloseHandle(hfile);
pbuf = (BYTE*) MapViewOfFile(hmapfile,FILE_MAP_READ ,0,0,filesizeLow);
but its ok with the simple text file ......

one more thing i want to ask that is there any way to hide the folder or file........

I can spot two problems with your code.
1. You cannot read a drive. You have to read a file. What exactly is it you want to do? If you want to read raw data from the hard drive sector by sector, you'll need a different API.
2. You cannot close the handle before accessing the file mapping. Read what you have to, and close the file once you're done.

sarfaraznawaz wrote:
one more thing i want to ask that is there any way to hide the folder or file.....

I saw you started a new thread for this, which is good. Keep that discussion there, and you will more likely attract others who might know.

home

thanks ...........

ya i want to read raw data from the hard drive sector by sector which is are the API are there

I found the following article on MSDN[^]. It's for reading sectors off a CD_ROM drive. Maybe it's possible for hard drives as well.

If not, I suggest you start a new thread with this more specific requirement. (Reading sector by sector.)

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