C / C++ / MFC

Re: How to get &amp; send data from USB

4-Nov-05 3:25

I have to create a simple appliction
that will have to send & receive data
from the USB port .
Can anyone help ??
Thank you

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

Anehl4-Nov-05 4:27

Anehl

4-Nov-05 4:27

I think you can use the directory routines "_getdrives();" to visit the drives and its subfolder and a basic copy function to write or read data

Re: How to get &amp;amp; send data from USB

vikas amin4-Nov-05 19:14

linker errors porting from .NET 1.1 to 2.0

4-Nov-05 19:14

Thank you
Its like this that we have created a small
Serial to USB converter ,
I just want to send some data & receive some
data from the USB port .
Thats it....

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

chucker754-Nov-05 2:28

4-Nov-05 2:28

Hi Folks,

I got a Wrapper Dll around a native C++ static library. In .NET 1.1 this
worked fine. When moving to .NET 2.0 I get a couple of unresolved externals /
linker errors:

Error 16 error LNK2028: unresolved token (0A000007) "extern "C" void
__clrcall ___CxxCallUnwindDtor(void (__clrcall*)(void *),void *)"
(?___CxxCallUnwindDtor@@$$J0YMXP6MXPAX@Z0@Z) referenced in function "public:
virtual __thiscall std::logic_error::~logic_error(void)"
(??1logic_error@std@@$$FUAE@XZ) Parameter.obj
Error 17 error LNK2028: unresolved token (0A000007) "extern "C" void
__clrcall ___CxxCallUnwindDtor(void (__clrcall*)(void *),void *)"
(?___CxxCallUnwindDtor@@$$J0YMXP6MXPAX@Z0@Z) referenced in function "public:
__thiscall std::bad_alloc::bad_alloc(char const *)"
(??0bad_alloc@std@@$$FQAE@PBD@Z) Imagic.obj
Error 18 error LNK2028: unresolved token (0A000008) "extern "C" void
__clrcall ___CxxCallUnwindDtor(void (__clrcall*)(void *),void *)"
(?___CxxCallUnwindDtor@@$$J0YMXP6MXPAX@Z0@Z) referenced in function "public:
virtual __thiscall std::logic_error::~logic_error(void)"
(??1logic_error@std@@$$FUAE@XZ) Align2D.obj
Error 19 error LNK2028: unresolved token (0A000347) "void __clrcall `eh
vector destructor iterator'(void *,unsigned int,int,void (__clrcall*)(void
*))" (??_M@$$FYMXPAXIHP6MX0@Z@Z) referenced in function "public: virtual void
* __thiscall std::logic_error::`vector deleting destructor'(unsigned int)"
(??_Elogic_error@std@@$$FUAEPAXI@Z) Parameter.obj
Error 20 error LNK2028: unresolved token (0A0003D3) "void __clrcall `eh
vector destructor iterator'(void *,unsigned int,int,void (__clrcall*)(void
*))" (??_M@$$FYMXPAXIHP6MX0@Z@Z) referenced in function "public: virtual void
* __thiscall std::bad_alloc::`vector deleting destructor'(unsigned int)"
(??_Ebad_alloc@std@@$$FUAEPAXI@Z) Imagic.obj
Error 21 error LNK2028: unresolved token (0A000358) "void __clrcall `eh
vector destructor iterator'(void *,unsigned int,int,void (__clrcall*)(void
*))" (??_M@$$FYMXPAXIHP6MX0@Z@Z) referenced in function "public: virtual void
* __thiscall std::logic_error::`vector deleting destructor'(unsigned int)"
(??_Elogic_error@std@@$$FUAEPAXI@Z) Align2D.obj
Error 22 error LNK2001: unresolved external symbol "?.cctor@@$$FYMXXZ"
(?.cctor@@$$FYMXXZ) Align2D.obj
Error 23 error LNK2001: unresolved external symbol "?.cctor@@$$FYMXXZ"
(?.cctor@@$$FYMXXZ) AssemblyInfo.obj
Error 24 error LNK2001: unresolved external symbol "?.cctor@@$$FYMXXZ"
(?.cctor@@$$FYMXXZ) Imagic.obj
Error 25 error LNK2001: unresolved external symbol "?.cctor@@$$FYMXXZ"
(?.cctor@@$$FYMXXZ) Parameter.obj
Error 26 error LNK2019: unresolved external symbol "extern "C" void
__clrcall ___CxxCallUnwindDtor(void (__clrcall*)(void *),void *)"
(?___CxxCallUnwindDtor@@$$J0YMXP6MXPAX@Z0@Z) referenced in function "public:
virtual __thiscall std::logic_error::~logic_error(void)"
(??1logic_error@std@@$$FUAE@XZ) Align2D.obj
Error 27 error LNK2001: unresolved external symbol "extern "C" void
__clrcall ___CxxCallUnwindDtor(void (__clrcall*)(void *),void *)"
(?___CxxCallUnwindDtor@@$$J0YMXP6MXPAX@Z0@Z) Imagic.obj
Error 28 error LNK2001: unresolved external symbol "extern "C" void
__clrcall ___CxxCallUnwindDtor(void (__clrcall*)(void *),void *)"
(?___CxxCallUnwindDtor@@$$J0YMXP6MXPAX@Z0@Z) Parameter.obj
Error 29 error LNK2019: unresolved external symbol "void __clrcall `eh
vector destructor iterator'(void *,unsigned int,int,void (__clrcall*)(void
*))" (??_M@$$FYMXPAXIHP6MX0@Z@Z) referenced in function "public: virtual void
* __thiscall std::logic_error::`vector deleting destructor'(unsigned int)"
(??_Elogic_error@std@@$$FUAEPAXI@Z) Align2D.obj
Error 30 error LNK2001: unresolved external symbol "void __clrcall `eh
vector destructor iterator'(void *,unsigned int,int,void (__clrcall*)(void
*))" (??_M@$$FYMXPAXIHP6MX0@Z@Z) Imagic.obj
Error 31 error LNK2001: unresolved external symbol "void __clrcall `eh
vector destructor iterator'(void *,unsigned int,int,void (__clrcall*)(void
*))" (??_M@$$FYMXPAXIHP6MX0@Z@Z) Parameter.obj
Error 32 fatal error LNK1120: 9 unresolved externals Debug\empDll.dll

In my .NET 1.1 Project I had to make the following Linker Settings to build
the DLL:

1.) Additional Dependencies: mscoree.lib msvcrt.lib (or msvcrtd.lib for
debug version) mystaticlib.lib

2.) Ignore Specific Library: nochkclr.obj

3.) Force Symbol Reference: __DllMainCRTStartup@12

In my Wrapper Classes I had to add the following:

#using <mscorlib.dll>

using namespace System;
using namespace System::Runtime::InteropServices;

This does not work any longer with the new Visual Studio and the new .NET
Framework.

The only article that I was able to find on this subject:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnvs05/html/TransGuide.asp

Doesn´t mention Linker settings at all.

Could anybody please help me or tell me where to go for further reading?
Thanks in Advance for your efforts.

Chucker

S. Senthil Kumar4-Nov-05 2:50

S. Senthil Kumar

4-Nov-05 2:50

Did you try adding msvcmrt.lib to the Additional Dependencies section?

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

chucker754-Nov-05 3:57

4-Nov-05 3:57

Now I tried it and it resolved the unresolved externals! Thanks for this hint!

Unfortunately this did not solve the whole problem. Now I get the following BadImageFormatException:

System.BadImageFormatException was unhandled
Message="Could not load file or assembly 'empDll, Version=1.6.0.1, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format."
Source="empDllTest"
FileName="empDll, Version=1.6.0.1, Culture=neutral, PublicKeyToken=null"
FusionLog="=== Pre-bind state information ===\r\nLOG: User = MPG-BPC\\mschmei\r\nLOG: DisplayName = empDll, Version=1.6.0.1, Culture=neutral, PublicKeyToken=null\n (Fully-specified)\r\nLOG: Appbase = file:///D:/empRemoting2/Release/\r\nLOG: Initial PrivatePath = NULL\r\nCalling assembly : empDllTest, Version=1.0.2134.28533, Culture=neutral, PublicKeyToken=null.\r\n===\r\nLOG: This bind starts in default load context.\r\nLOG: No application configuration file found.\r\nLOG: Using machine configuration file from C:\\WINDOWS\\Microsoft.NET\\Framework64\\v2.0.50727\\config\\machine.config.\r\nLOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).\r\nLOG: Attempting download of new URL file:///D:/empRemoting2/Release/empDll.DLL.\r\nERR: Failed to complete setup of assembly (hr = 0x8007000b). Probing terminated.\r\n"
StackTrace:
at empDllTest.DllTester.Main(String[] args)
at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

chucker754-Nov-05 4:08

4-Nov-05 4:08

Oooops, this was my fault now. It was a 64 Bit issue. In 32 Bit everything is fine now! Blush | :O

) Thanks alot! Chucker

S. Senthil Kumar4-Nov-05 4:10

S. Senthil Kumar

4-Nov-05 4:10

Is that a pure managed DLL or a mixed-mode DLL? How are you loading the DLL, directly or via reflection?

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

chucker754-Nov-05 4:13

4-Nov-05 4:13

It is mixed mode and I just have to recompile the static libs in 64 Bit Mode or obtain the 64 Bit Versions of the static libs. I think I will get this done now! Thanks a lot Chucker

_bstr_t help needed

ita_cas4-Nov-05 2:28

ita_cas

4-Nov-05 2:28

Hi all ,
could someone explain what is the diffrent between this contructor
_bstr_t(
BSTR bstr,
bool fCopy
);
and this
_bstr_t(
const _bstr_t& s1
) throw( );

Do I have to free one of these afte use ?
Do i habe to the BSTR (for the first example) ?

Thanks very much

Re: _bstr_t help needed

S. Senthil Kumar4-Nov-05 2:45

S. Senthil Kumar

4-Nov-05 2:45

The second one is the copy constructor for _bstr_t. No, you don't need to do any SysFreeString, _bstr_t takes care of it when the destructor runs.

The first constructor, AFAIK, copies or "attaches" the BSTR to the _bstr_t instance, depending on the fCopy parameter. If you pass true, you need to SysFreeString the BSTR yourself.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: _bstr_t help needed

Michael Dunn4-Nov-05 18:49

Michael Dunn

4-Nov-05 18:49

In the first ctor, if you pass FALSE for fCopy, the _bstr_t object takes ownership of the BSTR that you pass as the first parameter. If you pass TRUE, it does not, but instead makes a copy of the BSTR, which it then manages.

--Mike--
Visual C++ MVP Cool | :cool:

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what is a smart pointer

vikas amin4-Nov-05 2:16

4-Nov-05 2:16

Hi
Do any one knows the use of
a Smart Pointer?
what is exactly a smart pointer?
thank you

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

Maximilien4-Nov-05 2:18

Maximilien

4-Nov-05 2:18

on wikipedia ( via google )[^]

Maximilien Lincourt
Your Head A Splode - Strong Bad

vikas amin4-Nov-05 2:23

4-Nov-05 2:23

"Speed is the Key to success"
thank you

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

toxcct4-Nov-05 3:09

toxcct

4-Nov-05 3:09

have a look at the auto_ptr<>[^] class which is part of the standard C++ library...

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

qfegd4-Nov-05 3:28

qfegd

4-Nov-05 3:28

Take a look at the boost documentation.
http://www.boost.org/libs/smart_ptr/smart_ptr.htm[^]

Eric

Graham Shanks4-Nov-05 3:37

Graham Shanks

4-Nov-05 3:37

Also take a look at the Boost smart pointers[^]

Note that shared pointers will become part of the C++ standard as they are included in TR1[^] - coming to a compiler near you, soon(er or later)

Edit: qfegd beat me to it Sniff | :^)

, but he didn't get the link to TR1 Big Grin | :-D

P.S. how do you pronounce qfegd?

Graham

-- modified at 9:38 Friday 4th November, 2005

toxcct4-Nov-05 3:44

toxcct

4-Nov-05 3:44

sorry sir, my finger slided too fast on my mouse button, and i unvoluntarily voted you down... all appologies Rose | [Rose]

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

Graham Shanks4-Nov-05 3:49

Graham Shanks

4-Nov-05 3:49

toxcct wrote:
sorry sir, my finger slided too fast on my mouse button, and i unvoluntarily voted you down...

No worries, mate

ThatsAlok6-Nov-05 21:06

ThatsAlok

6-Nov-05 21:06

toxcct wrote:
sorry sir, my finger slided too fast on my mouse button, and i unvoluntarily voted you down... all appologies

No worries! I voted 5 on your Behalf !

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV