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Learning CPP language wrote:
Where do I start learning?

Books, Web sites, etc. Pick up a free compiler (e.g., Visual Studio Express) and just start tinkering.

Learning CPP language wrote:
Is there a tutorial or disucssion board for n00bs?

Yes, the one you are on now is for C / C++ / MFC.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Hi I have a machine with several network interfaces that route through different NAT VPNs.
I've created a testing application that bind()s to one of these interfaces before calling connect(), which works excellent in Windows 7. When I try the same thing in Windows XP, bind() succeeds, but connect() fails with 10065 (WSAEHOSTUNREACH) after some seconds of blocking. I checked Wireshark, and there isn't even one single packet sent/received on each interface.
Any ideas what may be the problem?

Don't try it, just do it!

OK, this is probably a stupid question (so I won't be unhappy if I get a stupid answer

) but are you sure the host is reachable through that interface on the XP host? Have you checked with some other network application?

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: bind() to specific network interface before connect()

Alexander ^M. , 28-May-09 12:45

yea it is reachable. When i switch the default gateway to the interface i want to use i can reach the hosts.
the routes should be fine.
=========================================================================== Schnittstellenliste 0x1 ........................... MS TCP Loopback interface 0x2 ... 00 0c 29 70 8c 43 ...... VMware Accelerated AMD PCNet Adapter - Paketplaner-Miniport 0x10004 ... 00 0c 29 70 8c 39 ...... VMware Accelerated AMD PCNet Adapter =========================================================================== =========================================================================== Aktive Routen: Netzwerkziel Netzwerkmaske Gateway Schnittstelle Anzahl 0 . 0 . 0 . 0 0 . 0 . 0 . 0 192 . 168 . 178 . 1 192 . 168 . 178 . 28 1 0 . 0 . 0 . 0 0 . 0 . 0 . 0 192 . 168 . 179 . 1 192 . 168 . 179 . 130 100 127 . 0 . 0 . 0 255 . 0 . 0 . 0 127 . 0 . 0 . 1 127 . 0 . 0 . 1 1 192 . 168 . 178 . 0 255 . 255 . 255 . 0 192 . 168 . 178 . 28 192 . 168 . 178 . 28 1 192 . 168 . 178 . 28 255 . 255 . 255 . 255 127 . 0 . 0 . 1 127 . 0 . 0 . 1 1 192 . 168 . 178 . 255 255 . 255 . 255 . 255 192 . 168 . 178 . 28 192 . 168 . 178 . 28 1 192 . 168 . 179 . 0 255 . 255 . 255 . 0 192 . 168 . 179 . 130 192 . 168 . 179 . 130 100 192 . 168 . 179 . 130 255 . 255 . 255 . 255 127 . 0 . 0 . 1 127 . 0 . 0 . 1 100 192 . 168 . 179 . 255 255 . 255 . 255 . 255 192 . 168 . 179 . 130 192 . 168 . 179 . 130 100 224 . 0 . 0 . 0 240 . 0 . 0 . 0 192 . 168 . 178 . 28 192 . 168 . 178 . 28 1 224 . 0 . 0 . 0 240 . 0 . 0 . 0 192 . 168 . 179 . 130 192 . 168 . 179 . 130 100 255 . 255 . 255 . 255 255 . 255 . 255 . 255 192 . 168 . 178 . 28 192 . 168 . 178 . 28 1 255 . 255 . 255 . 255 255 . 255 . 255 . 255 192 . 168 . 179 . 130 192 . 168 . 179 . 130 1 Standardgateway: 192 . 168 . 178 . 1 =========================================================================== Ständige Routen: Keine

Don't try it, just do it!

http://technet.microsoft.com/en-us/magazine/cc137807.aspx
Windows XP uses weak host model, Vista and later strong host model. There doesn't seem to be a way to configure this in Windows XP which is particularly ANNOYING!!

Don't try it, just do it!

Woah - your network-fu is way stronger than mine

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Static Library linking problem: Archive has no index; run ranlib to add one

thelonesquirrely 28-May-09 8:26

thelonesquirrely 28-May-09 8:26 Heya,
So I am trying to work on a make environment that will let me create two libraries and then link against them.
The procedure goes like this:
1. create obj files for lib1 (about a dozen files):
*** Compiling .obj/common.o ...
g++ -O3 -MMD -pipe -pthread -D_REENTRANT -DICL_MEM_DEFAULT_DIRECT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -DBASE_THREADSAFE -march=native -Wall -Wno-write-strings -Wpointer-arith -Wno-ctor-dtor-privacy -Wmultichar -Wdisabled-optimization -Woverloaded-virtual -Wclobbered -Wempty-body -Wsign-compare -Wtype-limits -Wno-unused -Wuninitialized -I./proto -I/tmp/protobuf-2.1.0/include -I/tmp/protobuf-2.1.0/include/google/protobuf -I/tmp/protobuf-2.1.0/include/google/protobuf/io -c proto/common.pb.cc -o .obj/common.o
2. group the object files together into archive
ar rcs lib/libxproto.a ./.obj/cs_enums.o ./.obj/common.o ./.obj/converged_common.o ...<obj list="">
3. repeat for the second lib.
4. compile a few other objs for MY program:
*** Compiling ../BuildSupport/ExternalLinks/utilities/src/Thread.C ...
g++ -O3 -MMD -pipe -pthread -D_REENTRANT -DICL_MEM_DEFAULT_DIRECT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -DBASE_THREADSAFE -march=native -Wall -Wno-write-strings -Wpointer-arith -Wno-ctor-dtor-privacy -Wmultichar -Wdisabled-optimization -Woverloaded-virtual -Wclobbered -Wempty-body -Wsign-compare -Wtype-limits -Wno-unused -Wuninitialized -I./include -I../BuildSupport/ExternalLinks/utilities/include -I./proto -I/tmp/protobuf-2.1.0/include -I/tmp/protobuf-2.1.0/include/google/protobuf -I/tmp/protobuf-2.1.0/include/google/protobuf/io -I/tmp/OpenAMQ-1.4b3/ibase/include -I../BuildSupport/ExternalLinks/boost/include/boost-1_39 -I../BuildSupport/ExternalLinks/utilities/include -I../CaddyShack_Common/amq/include -I../CaddyShack_Common/id/include -c ../BuildSupport/ExternalLinks/utilities/src/Thread.C -o .obj/Thread.o
5. the final step is to compile the objs into an executable, link against the libs:
g++ -static -O3 -MMD -pipe -pthread -D_REENTRANT -DICL_MEM_DEFAULT_DIRECT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -DBASE_THREADSAFE -march=native -Wall -Wno-write-strings -Wpointer-arith -Wno-ctor-dtor-privacy -Wmultichar -Wdisabled-optimization -Woverloaded-virtual -Wclobbered -Wempty-body -Wsign-compare -Wtype-limits -Wno-unused -Wuninitialized -L./lib -lxamq -lxproto <obj list=""> -o ../bin/circuit_accelerator
I get the following error:
./lib/libxamq.a: could not read symbols: Archive has no index; run ranlib to add one
collect2: ld returned 1 exit status
I tried using ranlib after it, and then just relinking still no good. I also am using the 's' flag when doing the ar, meaning i shouldn't have to do a ranlib.
any ideas on why i would be getting this error? Any ideas on how to resolve it? Thanks in advance!!!
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Re: Static Library linking problem: Archive has no index; run ranlib to add one

Single Step Debugger 28-May-09 10:03

Are you sure that this is the correct linking order: -L./lib -lxamq –lxproto?

The narrow specialist in the broad sense of the word is a complete idiot in the narrow sense of the word.
Advertise here – minimum three posts per day are guaranteed.

Re: Static Library linking problem: Archive has no index; run ranlib to add one

Stuart Dootson 28-May-09 11:06

I would investigate any difference in the build processes of libxamq.a and libxproto.a - it looks like ld can find an index in libxproto.a...
Also - I presume you've deleted libxamq.a and rebuilt it from scratch?

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Static Library linking problem: Archive has no index; run ranlib to add one

thelonesquirrely 28-May-09 14:06

Figured it out!!!!
I was using the $< flag for a gcc build in the makefile. I had added a dependency and on some *.h files, meaning that gcc was now trying to compile those, creating some kinda bogus obj files. Thus the lack of an object index....I officially hate makefiles, and feel like an ass. Thanks soo much!
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Re: Static Library linking problem: Archive has no index; run ranlib to add one

Stuart Dootson 28-May-09 14:47

If you're building a library with make (I'm talking Gnu make here), the approach I've used in the past is just to specify the dependency between the archive and its members and let make work out how to build from the built-in rules, customising the build where necessary using the compiler flag variables.
Consider this situation - I have a library, libtest.a, containing b.o (built from b.c) and c.o (built from c.cpp). Both files are dependent on the header file test.h.
This library is used to build an executable a, which has a main file a.o (built from a.c). a.o is also dependent on test.h
This makefile expresses these dependencies relatively minimally, and also modifies the standard compilation commands (turning on optimisations):
EXE_OBJS = a.o LIB_OBJS = b.o c.o LIB_ITEMS = $( foreach dir, $(LIB_OBJS), libtest.a($(dir))) CFLAGS=-O2 CXXFLAGS=-O2 a : $(EXE_OBJS) gcc -o a $< -ltest a : libtest.a $(EXE_OBJS) : test.h libtest.a : $(LIB_ITEMS) $(LIB_OBJS) : test.h


                        EXE_OBJS

is a list of the objects linked directly into the executable.


                        LIB_OBJS

is a list of the object files included in the archive.


                        LIB_ITEMS

is a simple transformation of LIB_OBJS into archive members (


                        LIB_ITEMS

will be


                        libtest.a(b.0) libtest.a(c.o)

).
The rules with commands express the primary dependencies, but the other rules also cause rule commands to be executed. That means that if I modify b.c, the libtest.a and a rules will be invoked (b.c => b.o => libtest.a(b.o) => libtest.a => a), so re-compiling b.c into b.o, inserting b.o into libtest.a and re-linking a.
Similarly, if I modify test.h, the rules mean that all the objects will be re-compiled.
It might be a little more involved, but I find it lets me express the dependencies more correctly (and I can use $< without worrying about including files that shouldn't be

)

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Read an IGES (Initial Graphics Exchange Specification) File uaing C++

raesa 28-May-09 2:55

raesa 28-May-09 2:55 I have an IGES file.I have to read this file using c++.
This basically has the graphics data (data realated to lines and otehr geometric entities) in the form of some numbers.
I have no idea how to go about this task.
Please do tell me if there is a way to read an IGES file.
Thnx in advnce.
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Re: Read an IGES (Initial Graphics Exchange Specification) File uaing C++

led mike 28-May-09 4:33

If you have the file format specifications and permission to open the file it should be basic programming 101 to code that. If you can't then you need to get some good beginners books or enroll in a University Computer Science program. If you are having a more specific problem then you need to explain what it is so we can help.
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Re: Read an IGES (Initial Graphics Exchange Specification) File uaing C++

raesa 28-May-09 18:27

raesa 28-May-09 18:27 Actually my task here is i have an input iges file.
I have to read the geometry data using c++ from this file and recreate the geometry.
I opened the file in a notepad and i found the data is in the form of some kind of numbers.
I do not know how to read the geomtry from the file.
It wold be very helpfull if you let me know if there are any good links related to this.
Thank you.
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Re: Read an IGES (Initial Graphics Exchange Specification) File uaing C++

Stuart Dootson 28-May-09 8:01

There are some free IGES related tools, some with source code, here [ ^ ].

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Read an IGES (Initial Graphics Exchange Specification) File uaing C++

Maximilien 28-May-09 11:09

Maximilien 28-May-09 11:09 First, I assume you already have a 3D graphic engine to display, huh, 3D.
Second, get the IGES specifications, there are a couple of link on the IGES wikipedia page.
Third, read and parse the file to extract 3d entities and convert them to you own internal format.
Get hold of a free converter and convert the IGES file to something you can read.
good luck.

This signature was proudly tested on animals.

With Visual Studio 2008, how can I specify the operating system for who I will compile my application? I develop under Vista but I want to utilize on XP.
Thanks,
Claude
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#define _WIN32_WINNT 0x0500 #endif
Use version > 0x0400 otherlise you will get a compile error in VS2008.

The narrow specialist in the broad sense of the word is a complete idiot in the narrow sense of the word.
Advertise here – minimum three posts per day are guaranteed.

Why error is showed?:
error C2664: 'CWnd::MessageBoxW' : cannot convert parameter 1 from 'const char [41]' to 'LPCTSTR'
thank you

thank you
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You might be using unicode build( which is default in vs2005 and later ). so should pass unicode string to


                                          MessageBox()

function. To convert your string to unicode. use

_T

macro.


                                          MessageBox( _T("This is my first Visual C++ Application!"));

[OpenedFileFinder] [My Blog]

You are building for Unicode and therefore trying to pass an ANSI string to an API which expects an Unicode string. Include all your literal strings within the TEXT macro.

anassamar wrote:
MessageBox("This is my first Visual C++ Application!");

MessageBox( _T ("This is my first Visual C++ Application!" ) );
The

_T

macro automatically emits an ANSI or an Unicode string (by prefixing nothing if building for


                                         MBCS

or by prefixing

to the literal string if building for Unicode)
These links may help you further to understand about string data types:
The Complete Guide to C++ Strings, Part I - Win32 Character Encodings [ ^ ]
The Complete Guide to C++ Strings, Part II - String Wrapper Classes [ ^ ]
This might help you with International programming and Unicode:
International programming [ ^ ]
It is a crappy thing, but it's life -^ Carlo Pallini
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