C / C++ / MFC Discussion Boards

Re: How to terminate a process produced by ShellExecute

sunshine jeffrey16-Apr-07 5:50

sunshine jeffrey

16-Apr-07 5:50

Thank you for your suggestions, Stephen and Mark. I also kinda feel TerminateProcess a little brutal Smile | :)

I will try the ways as suggested. Thanks

Jeffrey

What is message loop

dinesh_kr01615-Apr-07 6:27

dinesh_kr016

15-Apr-07 6:27

What is message loop in MFC

Re: What is message loop

bob1697215-Apr-07 7:06

bob16972

15-Apr-07 7:06

Only the best will do...

Paul DiLascia - Meandering Through the Maze of MFC Message and Command Routing[^]

Re: What is message loop

Hamid_RT15-Apr-07 18:10

Hamid_RT

15-Apr-07 18:10

See Using Messages and Message Queues [^]

WhiteSky

viewing subreports crystal

namratab15-Apr-07 4:35

namratab

15-Apr-07 4:35

hello,
I have a crystal report (version 8.5) which has about 10 on-demand sub-reports embedded in it. But when the report opens, the hyperlinks for them do not work, as in, they appear as plain-text, not clikable.
The same report works just fine when viewed in crystal software. I am using visual c++ 6.0. Is there any addtional coding to be done to enable it.?
Also, how do I determine which subreport the user has clicked on, in order to open the appropriate sub-report. Right now, all i am able to do is to scroll through each of these subreports. But i dont know how to stop and display the one that the user has clicked on.
Kindly help

How to know ANSI or UNICODE file

rp_suman15-Apr-07 3:30

rp_suman

15-Apr-07 3:30

I would like to know whether a file(*.txt) is normal ansi text file or unicode file by program. Is there standard class in C++/MFC for reading UNICODE file?
Best Regards,
Suman

Re: How to know ANSI or UNICODE file

George L. Jackson15-Apr-07 3:41

George L. Jackson

15-Apr-07 3:41

As with anything else, it is not a straight forward process:

http://codesnipers.com/?q=node/68[^]

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Re: How to know ANSI or UNICODE file

bob1697215-Apr-07 5:03

bob16972

15-Apr-07 5:03

If the app expects the files to be relatively small, you can read in the file raw into a buffer and use IsTextUnicode() against the buffer using the IS_TEXT_UNICODE_SIGNATURE flag.

In an MFC app, this should occur in the serialize method or be a function called from the serialize method. to get the filesize, get the file pointer using ar.GetFile() and call GetLenth() on the file pointer. Obviously, you'll read in the raw data using ar.Read().

Not the most efficient way I'll bet, but it seems to work. However, note the disclaimer in MSDN in the remarks section for IsTextUnicode()

Re: How to know ANSI or UNICODE file

kakan15-Apr-07 19:10

kakan

15-Apr-07 19:10

AFAIK, there is a two byte signature at the very start of a UNICODE text file.
The signature consists of the character values FF hex (255 decimal) and FE hex (254 decimal).
They can be in the order FEFF or FFFE, which flags if the bytes in the file is big or little endian. I don't remember which is which, but Google is your friend.

You can try it yourself, just create a text file with Notepad, save it in UNICODE and then dump the file with a hexdump (or hexeditor) program.

Alcohol. The cause of, and the solution to, all of life's problems - Homer Simpson

return 2 values by method in ActiveX project

hameduser15-Apr-07 3:07

hameduser

15-Apr-07 3:07

hi,
I'm writing a ActiveX(OCX file) project in VC6 ,I want create one method in my project, this method have 2 parameters change in this method ,then when call this method in any language ( example delphi) I want see value change in these parameters ,

In fact I want my method return 2 strings value .

I don't know type these parameters and ...

thanks for any answer.

Re: return 2 values by method in ActiveX project

Paresh Chitte15-Apr-07 20:05

Paresh Chitte

15-Apr-07 20:05

Accept these two parameters by reference / pointer (out parameter).

[id(1), helpstring("XXXX")] HRESULT foo([out,retval] long* out1, [out,retval] long* out2);

Regards,

Paresh.

Re: return 2 values by method in ActiveX project

hameduser16-Apr-07 3:51

hameduser

16-Apr-07 3:51

thanks for your help paresh,

but, my project is AcriveX in Visual C++ 6 , and I create my method by classwizard, in classwizard type parameters is limited by combobox and have not this type ("[out,retval] long* out1") but I write this type manual and build my project , VC6 give error syntax error : '['

regards

Problems with IDL file in C++ dll [modified]

__rob15-Apr-07 1:56

__rob

15-Apr-07 1:56

Hello,
I am attempting to create a C++ dll for use with Visual Basic. I have managed to get my dll working when I late bind in Visual Basic6 using Private Declare Function ... but I wanted to make the dll so it was referencable in VB6, and have the function appear in the intellisense - without having to declare the dll and its functions in my VB6 project. I have been using this (dated) tutorial from microsoft as reference

I have achieved this with a fairly simple dll that takes a long from VB and returns a long. Here is the C++ code

<br />
int __stdcall testfunc(int incoming)<br />
{<br />
	incoming += 10;<br />
	return incoming;<br />
}<br />

and the code in the .idl file

<br />
 [<br />
 uuid(B99D1487-BC95-4d28-A064-55A4ED191343),<br />
 helpstring("vbtestdll"),<br />
 lcid(0x0409),<br />
 version(1.0)<br />
  ]<br />
  library vbtestdll<br />
	  {<br />
	  [<br />
		 helpstring("Sample functions exported by vbtest.dll"),<br />
		 version(1.0),<br />
		 dllname("vbtestdll.dll")<br />
	  ]<br />
	  module MyDllFunctions<br />
	  {<br />
<br />
		 [<br />
<br />
			helpstring("Returns an integer."),<br />
			entry("testfunc")<br />
		 ]<br />
		 int __stdcall testfunc([in] int incoming);<br />
	  }<br />
  }<br />

This is how it appears in the VB6 Object Browser. the type library references perfectly and I can use the function in vb, just like it was a native function.

My problem arrises when I try a more complicated function. The function I am trying to make available to VB6 returns char* - Now this seems to work perfectly when I late-bind the function using

Private Declare Function encrypt_string Lib "BlowDll.dll" (ByVal key As String, ByVal str As String, ByVal MircRet As Boolean) As String

I pass it 2 strings and either true or false, and it returns an encrypted string perfectly.

However, when I try to add this function to a .idl file, and reference the type library in visual basic, the object browser reports that the return type is "As unsupported variant type". It does however recognise that strings must be passed to the function (which are char* in cpp)

Here is a screenshot of the object browser in VB6

I have pretty much narrowed the problem down to how the function is declared in the .idl file, here is the declaration in the .idl file, the rest is identical to the above example, apart from the .dll name and name for the libraray and the uuid.

char* __stdcall encrypt_string([in, string]char *pinkey,[in, string]char *pinstr,[in]int mIRCret);

I have tried a few variations of this.. but none of them seem to make any difference..

<br />
<br />
[out, string] char* __stdcall encrypt_string([in, string]char *pinkey,[in, string]char *pinstr,[in]int mIRCret);<br />
<br />
[string] char* __stdcall encrypt_string([in ,string]char *pinkey,[in, string]char *pinstr,[in]int mIRCret);<br />
<br />

I am almost positive it has to do with the having [string] infront of char * as when I remove this from the arguments they also come up as unsupported variant type.

does anyone any any suggestions on how to resolve this issue..

thanks in advance for any help!

Re: Problems with IDL file in C++ dll

__rob15-Apr-07 8:44

__rob

15-Apr-07 8:44

fixed my problem the idl function prototype should return as LPSTR and it works - Thanks anyway!

[string]LPSTR __stdcall encrypt_string([in, string]char *pinkey,[in, string]char *pinstr,[in]int mIRCret);

integer array

cyn814-Apr-07 20:48

cyn8

14-Apr-07 20:48

hi,
i have an integer array that i would like to initialize to null or other integer equivalent to it.
Actually I need the values in the previous integer array to be flush out and be empty before i click a button and continue with what the program is doing. Any suggestion on how to do this?
Thank you for any help

Re: integer array

Arman S.15-Apr-07 1:54

Arman S.

15-Apr-07 1:54

// Suppose:
// int myrray[N];
// int *myarray = new int[N];

// So:
memset(myarray, 0, sizeof (array)); // init by second parameter for each byte

--
======
Arman

Re: integer array

Arman S.15-Apr-07 1:55

Arman S.

15-Apr-07 1:55

// sorry no 'array' but 'myarray'
memset(myarray, 0, sizeof (myarray)); // init by second parameter for each byte

--
======
Arman

Build Peer to Peer TV Streaming

esia14-Apr-07 18:14

esia

14-Apr-07 18:14

Hello, I very newbie to C++, I wanted to build Peer to Peer TV application to broadcast TV on the internet that do not need a server and high bandwidth. Something like Octoshape at http://www.octoshape.com/play/play.asp
I am not afraid to learn anything that is related in building this application, I am very keen and eager to learn to build p2p application. Can you give me what are the components that I should learn first before start building this kind of application ? such as socket programming, IO and what else ?
Any good website resources, tips, advices are very welcomed. I want to use C++. Thank you...

Re: Build Peer to Peer TV Streaming

Mark Salsbery15-Apr-07 13:40

Mark Salsbery

15-Apr-07 13:40

The basic components you'll need to know and work with -
1) User-interface/Windows programming
2) Capturing Video and audio from a device (camera, TV tuner card, etc.)
3) Compression of the audio and video streams
4) Realtime communication over a network
5) Decompression of the audio and video streams
6) Rendering of the audio and video streams

That's quite a bit for a beginner - just #1 is!

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: Build Peer to Peer TV Streaming

esia15-Apr-07 15:10

esia

15-Apr-07 15:10

Thanks for your reply, it helps.

MM_TEXT IN CWnd?

cyn814-Apr-07 17:50

cyn8

14-Apr-07 17:50

hi,
I was wondering whether it is possible to set the mapping mode of MM_TEXT in CWnd scrolling functions? It is actually a custom control with a base class of CWnd which display drawing using CDC.
Thanks for any reply

Re: MM_TEXT IN CWnd?

bob1697214-Apr-07 18:29

bob16972

14-Apr-07 18:29

MM_TEXT is the default mapping mode

Re: MM_TEXT IN CWnd?

cyn814-Apr-07 20:44

cyn8

14-Apr-07 20:44

i notice that when i set the scroll range using SetScrollRange function, the range i specify does not equal to mm_TEXT mapping mode. How can i make them same?

Re: MM_TEXT IN CWnd?

bob1697215-Apr-07 6:59

bob16972

15-Apr-07 6:59

I guess I would need to see the code to understand what the problem context is. I'm probably just misunderstanding what you are asking.

A window will use MM_TEXT by default. This makes it arbitrary to use logical ranges or device ranges since there is a one to one ratio.

If your client area defines a different mapping mode such as MM_HIMETRIC, you have at least two choices...

1) Use logical ranges for the scrollbars

2) Use device ranges for the scrollbar. This requires conversions from one coordinate system to the other. This is much simpler to accomplish with a CScrollView than CWnd in my opinion.

If you are pursuing option 2, then my answer to your question would be that you need to convert your scroll info from LPtoDP before setting the scrollbar info. However, you will likely need to provide more information describing what you are trying to accomplish before anyone can provide you with clear and helpful information.

Multiple Definition error

XTAL25614-Apr-07 17:05

XTAL256

14-Apr-07 17:05

Hi, there are hundreds of posts on the internet about this but i still don't get it. I am writing a windows program using the g++ compiler and the RAD C++ library[^]. I get these errors:

WarpFile.o(.text+0x0): In function `ZN11_RADCPP_APP12getBuildTimeEv':
C:/Program Files/Dev-Cpp/include/radc++.h:2182: multiple definition of `_RADCPP_APP::getBuildTime()'
Main.o(.text+0x6a0):C:/Program Files/Dev-Cpp/include/radc++.h:2182: first defined here
WarpFile.o(.text+0x30): In function `ZN11_RADCPP_APP12getBuildDateEv':
C:/Program Files/Dev-Cpp/include/radc++.h:2181: multiple definition of `_RADCPP_APP::getBuildDate()'
Main.o(.text+0x6d0):C:/Program Files/Dev-Cpp/include/radc++.h:2181: first defined here
WarpFile.o(.bss+0x0): In function `ZN11_RADCPP_APP12getBuildTimeEv':
etc...

Can someone please look at my code (here[^]) and tell me what i'm doing wrong. Or alternatively explain how i can prevent this error. I know it's because something has been defined in two object files but i don't know how to stop it

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