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cue_ball wrote:
i have a bit of back ground in c and now is given a project on vbC++..
Is that VB or VC++ ? What version of VC ?
cue_ball wrote:
i was suppose to create a program for my com to connect to a PLC(programmeable logic control) the progam is suppose to give me the status on the relay swithces status for my plc..
How does it connect to the PC ? If via parallel or serial ports, there are articles on this site on how to listen/speak to both of these.
Christian Graus - Microsoft MVP - C++
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IT visual c++..
im using vc++ 6.0
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And the interface to this device ?
Christian Graus - Microsoft MVP - C++
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im using a rs232c cable..
the plc im using is from matsushita modal fp2 and joined by et-lan.
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RS232 is serial, right ? Search this site in the search box above for 'serial port' and you'll find heaps of code.
Christian Graus - Microsoft MVP - C++
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YUp.. 232 is serial..
thanks will try searchin first
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hi guys.
i know it kinda of hard to explain to a newbies. how to write a serial port pro .. i try readin it up.. n down load some sample code.. but i just dont know where to use it..
basiclly i just need to come up with a simple dialog interface that .. will sent what i type in a textbox out thought a serial port.. and hint guys..
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I am currently integrating a correctly running windows service and a win32 application into a windows service which will listening to certain sockets with specified port. Individually, both of them works fine.
When i replace the endlessloop of the windows service with a segment of code which creates a socket instance, the service failed to start.
Can anybody explain to me the reason or suggest some rational modification that i should make to solve the problem...
Thanks for any help in advance!
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zhaopi wrote:
When i replace the endlessloop of the windows service with a segment of code which creates a socket instance, the service failed to start.
What does "failed to start" means exactly?
zhaopi wrote:
Can anybody explain to me the reason or suggest some rational modification that i should make to solve the problem...
It's hard to do that with the info you provide.
Perhaps if you give more details about the error and post a code snippet showing what you are doing, someone may suggest something useful.
--
jlr
http://jlamas.blogspot.com/[^]
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Heck - I like your answer better than mine (see below) - we must have been sending a response at roughly the same time ..
'G'
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Garth J Lancaster wrote:
Heck - I like your answer better than mine (see below)
I don't think mine is better. I think they complement each other. 
Cheers,
--
jlr
http://jlamas.blogspot.com/[^]
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Do you do any logging of the service startup and your own code ?
If the service was working before you added your code, then obviously its something in the socket init sequence thats doing it - so you need to put logging steps around this area of your code - did you test the code that creates the socket instance OUTSIDE the service ?? its easier to test such things from a standalone exe first, THEN add them to a service (imho)
Either way, you should be using the Application Event log (judiciously) and other logging methods when you're in the service.
'G'
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Thanks for all your help,
i have checked my code and the problem has been solved.
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I used nmake command to make a lib file, such as a.lib, and it's used in a project which include the "a.h". when I compile this project, there are such errors as follow:
Linking...
libcmtd.lib(crt0dat.obj) : error LNK2005: _exit already defined in msvcrtd.lib(MSVCRTD.dll)
libcmtd.lib(crt0dat.obj) : error LNK2005: __exit already defined in msvcrtd.lib(MSVCRTD.dll)
libcmtd.lib(fpinit.obj) : error LNK2005: __ldused already defined in a previous module
libcmtd.lib(fpinit.obj) : error LNK2005: __fltused already defined in a previous module
libcmtd.lib(crt0init.obj) : error LNK2005: ___xc_z already defined in msvcrtd.lib(cinitexe.obj)
libcmtd.lib(crt0init.obj) : error LNK2005: ___xc_a already defined in msvcrtd.lib(cinitexe.obj)
libcmtd.lib(crt0init.obj) : error LNK2005: ___xi_z already defined in msvcrtd.lib(cinitexe.obj)
libcmtd.lib(crt0init.obj) : error LNK2005: ___xi_a already defined in msvcrtd.lib(cinitexe.obj)
libcmtd.lib(winxfltr.obj) : error LNK2005: __XcptFilter already defined in msvcrtd.lib(MSVCRTD.dll)
libcpmtd.lib(locale.obj) : error LNK2005: "public: class std::locale & __thiscall std::locale::_Addfac(class std::locale::facet *,unsigned int,unsigned int)" (?_Addfac@locale@std@@QAEAAV12@PAVfacet@12@II@Z) already defined in msvcprtd.lib(MSVCP60D.d
ll)
libcpmtd.lib(locale.obj) : error LNK2005: "public: __thiscall std::_Locinfo::_Locinfo(char const *)" (??0_Locinfo@std@@QAE@PBD@Z) already defined in msvcprtd.lib(MSVCP60D.dll)
libcpmtd.lib(locale.obj) : error LNK2005: "public: __thiscall std::_Locinfo::~_Locinfo(void)" (??1_Locinfo@std@@QAE@XZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcpmtd.lib(locale0.obj) : error LNK2005: "public: class std::locale::facet const * __thiscall std::locale::_Getfacet(unsigned int,bool)const " (?_Getfacet@locale@std@@QBEPBVfacet@12@I_N@Z) already defined in msvcprtd.lib(MSVCP60D.dll)
libcpmtd.lib(locale0.obj) : error LNK2005: "public: bool __thiscall std::locale::_Iscloc(void)const " (?_Iscloc@locale@std@@QBE_NXZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcpmtd.lib(locale0.obj) : error LNK2005: "private: static class std::locale::_Locimp * __cdecl std::locale::_Init(void)" (?_Init@locale@std@@CAPAV_Locimp@12@XZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcpmtd.lib(ios.obj) : error LNK2005: "public: void __thiscall std::ios_base::clear(int,bool)" (?clear@ios_base@std@@QAEXH_N@Z) already defined in msvcprtd.lib(MSVCP60D.dll)
libcpmtd.lib(ios.obj) : error LNK2005: "public: virtual __thiscall std::ios_base::~ios_base(void)" (??1ios_base@std@@UAE@XZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcpmtd.lib(ios.obj) : error LNK2005: "protected: void __thiscall std::ios_base::_Addstd(void)" (?_Addstd@ios_base@std@@IAEXXZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcpmtd.lib(ios.obj) : error LNK2005: "protected: void __thiscall std::ios_base::_Init(void)" (?_Init@ios_base@std@@IAEXXZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcpmtd.lib(iostream.obj) : error LNK2005: "public: __thiscall std::ios_base::Init::Init(void)" (??0Init@ios_base@std@@QAE@XZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcpmtd.lib(iostream.obj) : error LNK2005: "public: __thiscall std::ios_base::Init::~Init(void)" (??1Init@ios_base@std@@QAE@XZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcpmtd.lib(xwctomb.obj) : error LNK2005: __Getcvt already defined in msvcprtd.lib(MSVCP60D.dll)
msvcrtd.lib(MSVCRTD.dll) : error LNK2005: __setmbcp already defined in libcmtd.lib(mbctype.obj)
LINK : warning LNK4098: defaultlib "msvcrtd.lib" conflicts with use of other libs; use /NODEFAULTLIB:library
msvcrtd.lib(cinitexe.obj) : warning LNK4098: defaultlib "libcmtd.lib" conflicts with use of other libs; use /NODEFAULTLIB:library
libcmtd.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/GATest.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
I think maybe there is conflict between my lib and VC, so how can I avoid these errors?
Thank you very much!
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wanthelp wrote:
I think maybe there is conflict between my lib and VC, so how can I avoid these errors?
Make sure both the lib and the exe are using the same settings regargind single/multi threading.
--
jlr
http://jlamas.blogspot.com/[^]
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after I changed the project setting as your instruction as follow: c/c++ -> use run-time library, substitute the "Debug Multithreaded Dll" with "Debug Single-Threaded", there is a error:
Compiling...
StdAfx.cpp
e:\program files\microsoft visual studio\vc98\mfc\include\afxver_.h(130) : fatal error C1189: #error : Please use the /MD switch for _AFXDLL builds
Error executing cl.exe.
so, I think the default option "Debug Multithreaded Dll" is a good one
Is there any other instruction? I really need help
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wanthelp wrote:
so, I think the default option "Debug Multithreaded Dll" is a good one
Ok. That's for one of the projects. But you also mentioned you had a lib, which is used by the project that produces the exe, right? My point was that you made sure the option setting was the same in the lib project and in the exe project.
More details:
According to your post, the linker errors appear while linking GATest.exe, right?
Each of the errors is saying that some symbol (e.g.: _exit), which is defined in some object code file (e.g.: crt0dat.obj) in the library libcmtd.lib, was already defined in msvcrtd.lib, which is a stub for MSVCRTD.dll. The problem is that GATest.exe shouldn't be trying to link both libraries at the same time.
The first of those libraries, libcmtd, is used when you set the /MTd compiler option, which in the project settings dialog appear as "Multithreaded Debug" (or something similar, depending on the Visual Studio version you are using), and specifies you want to use the Runtime Library as a multithreaded static lib.
The second library, msvcrtd.lib, is used when you set the /MDd compiler option, which in the project settings dialog appear as "Multithreaded Debug DLL", and specifies you want to use the Runtime Library as a multithreaded dynamically linked library (DLL).
Now, my theory is that the project (or make file) you use to create the library is setting /MTd, and that conflicts with the setting in the GATest project, which is /MDd.
Thus, my suggestion is that you make sure both the lib and the exe use the same setting.
--
jlr
http://jlamas.blogspot.com/[^]
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I'll quote here the e-mail you sent me:
wanthelp wrote:
I got the source code from Internet and used command nmake to build the library. The source code is programmed by c, so I think there is no project setting. Therefore, I can only change the setting of GATest project as you mentioned -- changing /MDd to /MTd, but it still does not work 
I will appreciate you can give me more instruction about it.
Best regards
I will appreciate if you post this kind of messages to the forum, which is where they belong, instead of directly e-mailing me. I'll answer it if I can, or anybody else may offer help too. Unless there's something strictly personal in your message, or I ask for it, a direct e-mail is not appropriate.
Now, to your problem. If you are using nmake to build the library, the project is the makefile being passed to nmake, and the project settings are the contents of that makefile. Locate the makefile, and look for any /MTd or /MDd in it.
BTW, which library is that you are trying to use? Maybe there are some online instructions or user forum where you can get more help?
--
jlr
http://jlamas.blogspot.com/[^]
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Check the include files may be coming in loop like :-
//file b.h
#include "a.h"
//file c.h
#include "a.h"
#include "d.h"
//file e.h
#include "b.h"
#include "b.h"
This may reason for this LNK2005.
Remove this.
Check for Include files order in Directory tab from options.
Anuj
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Anuj Purwar wrote:
Check the include files may be coming in loop like :-
[...]
This may reason for this LNK2005
How come? Include directives are processed at compilation time. LNKnnnn is a linker error...
--
jlr
http://jlamas.blogspot.com/[^]
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How do you check if a check box has been checked?
I created a check box named IDC_checkbox and assigned a member variable of type Value named m_checkBox.
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There's a member method called GetCheck. It returns a BOOL, which is an int, 0 is not checked.
Christian Graus - Microsoft MVP - C++
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If you used Class Wizard and added a variable of type Value, it must have defined it as BOOL.
When you want to check the state of the checkbox, you can call UpdateData(TRUE) and that will copy the state of the control in your variable
UpdateData(TRUE);
if (m_checkBox)
{
}
else
{
}
To change the state of the control, assign a new value to your variable and call UpdateData(FALSE)
Note UpdateData() processes all controls that have associated "Value" variables at once.
--
jlr
http://jlamas.blogspot.com/[^]
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Jose Lamas Rios wrote:
If you used Class Wizard and added a variable of type Value, it must have defined it as BOOL
Damn, I missed that bit.
I hate that updatedata stuff, I never use it ( although I know all about it, I just missed it in his question ).
Christian Graus - Microsoft MVP - C++
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