C / C++ / MFC Discussion Boards

Re: Graphs and Charts

Nitron15-Jan-03 14:38

Nitron

15-Jan-03 14:38

Try MeasurementStudio[^] or LabView[^] @ National Instruments

- Nitron

"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb

DLL problem

Neville Franks14-Jan-03 20:17

Neville Franks

14-Jan-03 20:17

I have the following sample code in a DLL:

#define DllExport   __declspec( dllexport )

#include <vector>

class DllExport Archive
{
protected:
	std::vector<void*>  m_vPointerStored;
};

and get the following warning:

d:\libs\saiggeneric\test.h(11) : warning C4251: 'm_vPointerStored' : class 'std::vector<void *,class std::allocator<void *> >' needs to have dll-interface to be used by clients of class 'Archive'

It only seems to be a problem with STL members.

My understanding is that using __declspec( dllexport ) for a class makes the class and everything in it exportable. I'm trying to build a straight C++ DLL, not an MFC Extension DLL. I don't know if this has anything to do with the problem. Help!!!!

Neville Franks, Author of ED for Windows. www.getsoft.com
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Re: DLL problem

geo_m14-Jan-03 22:25

geo_m

14-Jan-03 22:25

Look at http://support.microsoft.com/default.aspx?scid=KB;en-us;q168958[^]
HOWTO: Exporting STL Components Inside & Outside of a Class there is some description which might be usefull (but I have no time to read it, to check if it really solves your problem)

Re: DLL problem

Neville Franks15-Jan-03 0:51

Neville Franks

15-Jan-03 0:51

Thanks, that's exactly what I needed to know. I had searched around the MS Web site, but didn't find this.

Neville Franks, Author of ED for Windows. www.getsoft.com
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datatype conversion

r i s h a b h s14-Jan-03 17:57

r i s h a b h s

14-Jan-03 17:57

dear all,
how can i display value of variables of sdk datatypes like DWORD, LPTSTR... in a message box

thanx

Re: datatype conversion

xxhimanshu14-Jan-03 19:40

xxhimanshu

14-Jan-03 19:40

convert into string first then you can display anything!!!!! as far as i know..

cheers..

Himanshu

Access the camera throught driver ?

TPN14-Jan-03 17:24

TPN

14-Jan-03 17:24

I want to manipulate the camera (connected to my computer) such as capturing video stream for cam chat, or video conferencing for further... So that I must know how to use, to control,... the camera throught the camera's driver. Please show me the way to start.
Thanks in advance !

aTpnT

Re: Access the camera throught driver ?

benjymous14-Jan-03 22:57

benjymous

14-Jan-03 22:57

There are examples for this in the DirectX SDK (amongst the DirectShow examples)

--
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Re: Access the camera throught driver ?

TPN15-Jan-03 0:52

TPN

15-Jan-03 0:52

I think your reply is so useful to me. Thanks so much, 'benjymous'!

aTpnT

_MAXPATH

Paul Silvernail14-Jan-03 17:00

Paul Silvernail

14-Jan-03 17:00

Hi All,

I would like to initialize a char array to hold a path retrieved from a registry key. If I used _MAXPATH constant from stdlib.h like this .... TCHAR MyPath[_MAXPATH], would this ensure that the array will be large enough? Even on 98, XP, NT?

Thanks
Paul

Re: _MAXPATH

Michael Dunn14-Jan-03 19:49

Michael Dunn

14-Jan-03 19:49

Never trust your inputs, especially when the source is the registry. Any user could go change your data to something longer than MAX_PATH, which would overrun your buffer, and we all know that only leads to Bad Things.

Call RegQueryValueEx() with NULL and 0 as the buffer and size respectively, and you'll get back the exact size of the value in bytes. Alloc a buffer of that size, and you'll always have a big-enough buffer. Check the type as well, make sure it's REG_SZ like you expect.

--Mike--
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Re: _MAXPATH

Paul Silvernail15-Jan-03 1:42

Paul Silvernail

15-Jan-03 1:42

Thanks Mike,

I knew there had to be a way.;)

Paul

Re: _MAXPATH

geo_m14-Jan-03 22:35

geo_m

14-Jan-03 22:35

I would not stick to it. As someone says, never trust your inputs - that's the first reason, second reason is, that this will hardcode the _MAX_PATH to your buffers forever. And now it might be that these 260 chars is enough, but will it be enough next year?

recommended reading

andyblack14-Jan-03 13:14

andyblack

14-Jan-03 13:14

Hi,
I am currently undertaking a project a requires the development of a Windows based application. I have some experiance in C++ coding but up to now all the programs I have coded have been command prompt run applications.

Just wondering if anyone knew of any good books that would get me started in learning how to program Windows applications. I have looked but there seems a vast amount out there. Confused | :confused:

I am thinking I would rather use the MFC libarys rather than making direct calls to the Windows API itself. Good idea??

Any recommendations would be greatly appreciated

Thanks in advance

Re: recommended reading

carrie14-Jan-03 23:25

carrie

14-Jan-03 23:25

Without MFC
http://www.amazon.co.uk/exec/obidos/ASIN/157231995X/ref=sr_aps_books_1_1/202-2181440-5510268

With MFC
http://www.amazon.co.uk/exec/obidos/ASIN/1572316950/ref=pd_sim_b_dp/202-2181440-5510268

Two of the best programming books for Windows as far as I know. They also double as great weightlifting training because of the size of them Big Grin | :-D

Packaging and DLLs

LukeV14-Jan-03 12:45

LukeV

14-Jan-03 12:45

Hi,

how can I be sure to include all needed DLLs with my packages? I'm using Depends but it shows a bunch of DLLs, such as Kernel or GDI and others. Some of them are probably already on the user's system but what I need to know if which one to include and where to install them (directly in the installation path or system32) ???

Thanks! Smile | :)

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Re: Packaging and DLLs

Jim Crafton14-Jan-03 16:56

Jim Crafton

14-Jan-03 16:56

if you have an MFC app, then any of the dll's named mfcXXX.dll you will need to redistrib. Also msvcrtXXX.dll. If you have any C++ that touches the Standard Library, then you will probably need msvcpp60.dll (I am assuming you are using VC6, and the STL that comes with it, if you are using STLPort's STL then use their lib)

For other stuff, you'll have top track that down. For example if you are using DirectShow in your app, then there are redistribs with that (don't know what they are).
Likewise for other stuff like ADO, et al...

¡El diablo está en mis pantalones! ¡Mire, mire!

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Re: Packaging and DLLs

LukeV15-Jan-03 4:33

LukeV

15-Jan-03 4:33

I'm using STL and ATL 7.0...

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Re: Packaging and DLLs

Jim Crafton15-Jan-03 5:37

Jim Crafton

15-Jan-03 5:37

OK well you should be OK. Be warned that I do NOT have VC7 and have not used it, so there could be other issues, different libs, etc. With ATL 3, depending on how you built your project, you also had to distribute the ATL.dll and there was a different version for Win9x OS vs. NT OS. Don't know if this is still the case.

¡El diablo está en mis pantalones! ¡Mire, mire!

Real Mentats use only 100% pure, unfooled around with Sapho Juice(tm)!

Consuming web services in a C++ app

User 988514-Jan-03 11:58

User 9885

14-Jan-03 11:58

Is there a C++ library that lets you create SOAP requests and read responses, so that I can create a C++ proxy class that encapsulates a web service?

My article on a reference-counted smart pointer that supports polymorphic objects and raw pointers

modified 29-Aug-18 21:01pm.

accessing selected text in a fore ground window

Gene Yu14-Jan-03 11:10

Gene Yu

14-Jan-03 11:10

Can any one tell me how to get to the selected text in an edit/richedit control (or any control having text that could be highlighted) of a foreground window from my own application? What about accessing a selected text in IE browser? One can see such use in Microsoft Boolshelf -- highlight any word in any window and then click on the QuickShelf icon in the system tray to get the meaning of the word! Tomasz Sowinski in the VC++ message board mentioned earlier using a combination of (1) calling the WIN32 API GETFOREGROUNDWINDOW to get a handle to the window and (2) sending the EM_GETSEL window message to get a pointer to the selected text. But I am not sure if this limits only to the case when the foreground window is itself a edit/richedit control.

Would appreciate very much any answers to these questions!

Gene Yu - gene4yu@yahoo.com

attach document to an application

aguest14-Jan-03 10:53

aguest

14-Jan-03 10:53

hello, I wants attach an application that I board create with a Word document or pdf,in way:whene I click on the document my application start in first.

Re: attach document to an application

xxhimanshu14-Jan-03 19:53

xxhimanshu

14-Jan-03 19:53

:-Oi guess you will have to write something into ergistry so that your application runs whenever the word is opened or cleicked to open any document.
i don't have a clue how to do it? just in case maybe you are smart enuf to proceed if there is an idea i am writing this here. I am not sure whether this will work or not. but i guess it should.

cheers.. Smile | :)

Himanshu

crashes in GetWindowPlacement

ns14-Jan-03 10:49

14-Jan-03 10:49

I tracked it down to:

BOOL CWnd::GetWindowPlacement(WINDOWPLACEMENT* lpwndpl) const
{
ASSERT(::IsWindow(m_hWnd));
lpwndpl->length = sizeof(WINDOWPLACEMENT);
return ::GetWindowPlacement(m_hWnd, lpwndpl);
}

and its at the assert that its unhappy.

I did get a non-null pointer imageDisplay that I used:

CImageDisplay* imageDisplay =m_imageDisplayVector[0];

// Get the window's current size and position.
imageDisplay->GetWindowPlacement(&wp);

Thanks

Appreciate your help,
ns

Re: crashes in GetWindowPlacement

Nitron15-Jan-03 14:41

Nitron

15-Jan-03 14:41

What is m_imageDisplayVector[0] ?? is it a valid ptr?
Where do you initialize it and what is it's value?

- Nitron

"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb

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