I originally posted a message in the ide_general newsgroup...but nobody
responded.  My question is this:
can you specify an older version upon compiling (much like specifying
"-source" in Java)?  My guess is no, but I thought I'd ask.

I'm trying to get FFTW (fftw.org) to work in such a way that it can be
called from a managed C++ module.  The approach I've found to generate
the fewest linker errors is a mixed managed/unmanaged project.
However, that still produces the following from the linker:

I am developing a MFC dll, which will be invoked by a C# winform app.
But the cl.exe don't work if i use "/clr" option,
then i uncheck the "/clr" option, it work well.
Is there anything conflict within my settings?

Introduction:
*********************
I am writing a mixed mode application I have a COM module and a .NET module
that communicate with each other.

I'm writing a security related application in .NET 1.1
and I wonder how I compute hashes from very large files (up to 1 GB).
Does anybody know a good pattern of how to create a stream from a binary
file

if i have the unmanaged c++ source files, what is the easy way to provide c#
interface to this unmanaged c++ dll, should i use managed c++ wrapper classes
or use PInvoke or use the /clr compiler option ?
Thanks.

Good Day,
I am developing an application that utilizes the serial port. I have looked
through the news groups and seen some examples.
Here is my dilemna:

How can I cast a String to a const wchar_t*?
Ths following code genreates a compile error:
error C2664: '_wsplitpath' : cannot convert parameter 1 from 'System::String
__gc *' to 'const wchar_t *'

I have a COM program developed in VC6. Now I converted it to VS.NET 2003,
but the custom build step failed when trying to build it. Here is the
command line in the custom build step:
regsvr32 /s /c "$(TargetPath)"

I'm a self instructed amateur attempting to read a huge file from disk... so
bear with me please...  I just learned that reading a file in binary is
faster than text. So I wrote the following code that compiles OK. It runs and
shows the requested output. However, after execution, ...

I have an application which run more than one thread at the sametime.
All those thread call same function (output function). How I lock this
function for other thread while one thread already use it.
in C# I done it by :

I'm trying to put together some managed and unmanaged code.  Everything
works fine until the program exits, and I suppose the garbage collector
runs to finalize things.  Then I get:
Unhandled Exception: System.NullReferenceException: Object reference

I'm having trouble setting the environment variables for the vc toolkit
2003. The  "vcvars32" failed to add the include and lib variables, so I
did it manually. The compiler is not finding the include directory,
returning a fatal C1083 (Cannot open include file). Nothing appeared to

I'm writing an app that basically just appends text to a text file on a
Win2K Server. They fill out a form, click a button, and 1 line is
appended to the file. Multiple people will run this app at the same
time, and all will write to the same file. If I do an immediate flush()

I have never learn VC++. But I'm interested about it.Who can give me some
advise?