Linux feature is gvfs. I see TFileStream don't support gvfs files. So I need some other TStream object to read gvfs files. Do such streams exist?
Lazarus 1.7, fpc 3.0
gvfs exposed to system as files:
/run/user/1000/gvfs/ftp:host=ftp.scene.org/ls-lR
If these are proper files to the Linux kernel, I don't see why Lazarus would fail.
To check what is exactly happening you might want to use strace on a simplest as possible program.
The call that fails could give you a clue what is happening. (like e.g. permissions)
Related
I'm using NixOS as the distro on WSL (via the excellent setup provided by Trundle: https://github.com/Trundle/NixOS-WSL) and I'd like to install the racket package. If I run nix-shell -p racket, it dutifully downloads (or uses the previously downloaded) the pre-built binary and I can use it just fine. But if I add racket to the environment.systemPackages list in configuration.nix and try to nixos-rebuild test, it starts trying to build things from source. It fails when it gets to gtk (presumably because WSL2 doesn't yet support graphical applications).
Why the difference in behavior? Is there a way I can convince NixOS to use the pre-built racket when filling out the systemPackages? Happy to post my configuration.nix if it would help the diagnosis, though it's really not much of a departure from Trundle's.
I compiled MySQL++ with no issues. When I launched some of the executables (resetdb.exe and simple1.exe) they suggest to run to test if the installation has been successful, the first error I got was that libmysql.dll was missing.
Adding its path to the PATH environment variable did not fix the problem, even after launching a new command prompt; I had to copy the DLL in the directory where MySQL++ executables are.
Now the DLL is found, but I get this error:
simple1.exe - Application error
The application was unable to start correctly (0xc000007b).
Click OK to close the application.
even launching from the command line, I get no more information than these.
Thank you for any help!
MySQL 5.5 -
MySQL++ 3.0.9 -
Windows 7 64 bits -
MINGW32 -
GCC 4.4.0
0xC000007B is a Windows error that means the executable is corrupted. It could refer either to simple1.exe or to one of the DLLs it's linking against.
Some reasons this could happen:
You're mixing toolchains in an incompatible way. In your case, you may have built simple1.exe using pieces built by MinGW GCC and pieces built by Visual C++. MinGW should be compatible with any pure C DLL built by Visual C++, including the MySQL C API DLL. However, you may have other pieces interfering. MinGW isn't compatible with VC++ at the C++ level, but then, it shouldn't have linked at all if this were your problem.
You didn't follow the MySQL C API import library build steps in README-MinGW.txt. You either missed a step, or skipped it entirely and are trying to use the import library that shipped with MySQL.
In your previous gyrations, you ended up with a corrupt object file, which got linked in. Try saying make clean all at the top level of MySQL++ to force a complete rebuild.
You're mixing versions of MySQL or MySQL++. If you have more than one version of each on the system, make sure you're consistent in their use. That is, build the C API import library from the same DLL you run the programs against, use exrun.bat to run the examples to ensure you're using the just-built version of the MySQL++ DLL instead of another you have in your PATH, etc.
Additionally, I note that you're using an older version of MySQL++. If you were on Linux, I could understand that as some distributions still ship with 3.0.9. But since you have to build MySQL++ from source with MinGW, I don't see why you're not using 3.1.0. Did you get a binary build from somewhere?
As for your PATH problem, did you restart the MinGW shell after doing this? PATH updates don't affect running programs; they keep the value they saw when they started.
I want to interact with a MySQL database from Matlab.
I found a mysql "library" for matlab here and the same on mathworks.
I followed the instructions to compile the library and the compilation seems to be successful. I get a mex32 file at the end. Only, the instructions on the first page refer to a Dll that I need to use (I guess that a Dll was supposed to be generated).
I am not familiar with the mex compiler or with compiling external modules for Matlab.
Am I missing something trivial? Where is the Dll supposed to be?
Thanks.
The reference to the dll is obsolete.
When you compile a mex function on Windows, you compile it as a dll (not an .exe). Thus, compiled mex functions used to have the extension .dll. Mex-functions with .dll extensions still work, but there is a warning that this might stop being the case in the future.
When 64-bit Windows arrived, TheMathWorks needed a way that people were to be able to compile the same mex-function for both Win32 and Win64, thus they changed the extension to .mexw32 and .mexw64, respectively. Apparently, they did not update the documentation completely.
I'd recommend using java to connect MATLAB and MySQL (or any other db if required).
The java database connector is simple to set up. I built a simple java class to connect to the database - see previous posting for a crude but working solution.
The MATLAB code works as indicated
% include java class
import Jam.ConnectToDatabase
% set up database connection info
userName='myName';
userPassword='myPassword';
databaseUrl='jdbc:mysql://glnd2818898.internal.net/2000';
% create java class instance and open connection to the database
ctd = ConnectToDatabase;
ctd.openConnection(userName, userPassword, databaseUrl)
Once the connection is open I can then use the java methods to submit SQL queries, create tables, insert data etc. I'd never used java before but I downloaded Netbeans and I was away.
OK, here is the solution to my problem.
The compilation does generate a mex32 file (32 is because I compiled it under a 32bit systme). You can check the output file of the compilation by running mexext. So apparently a mex32 file is a compiled version of the C file.
Once I placed the file in a directory that is in the Matlab's path it worked.
I guess the reference to the Dll in the link I provided is either obsolete or wrong.
I've installed recent Qt (4.5.3) sdk windows version. I'm want to use mysql in my app. Since Qt Mysql plugin in not available, so I compiled it from the included source. I copied compiled files D:\\Qt\2009.01\qt\plugins\sqldrivers.
Now when I run my application it still error "QMYSQL driver not loaded".
I suggest you take the whole Qt4 source code and compile it specifically for your own needs.
Something like this should do the job just fine:
Download the Qt source code from qt.nokia.com
Extract it somehwere and open a command prompt.
"cd" into the source directory and run "configure":
Just an example:
/Devel/qt/configure
-release
-fast
-opensource
-nomake "demos examples"
-silent
-qt-sql-mysql
You might have to additionally provide -I C:\path\to\mysql\includes and -L C:\path\to\mysql\libs.
After that, do "make install".
Hope that helps.
There may be several reasons leading to the driver not being loaded, I experienced several of them in my Qt experience.
Qt provides good documentation on this point, I suggest you have a look at the Troubleshooting subsection of Qt Assistant's SQL Database drivers section, it should help you diagnose your problem. It worked for me.
Hope that helps.
After compiling the plugin, you need to add the MySQL bin path to your PATH environment variable.
I'm getting this error while trying to run sample codes in CUDA SDK. I have CUDA 2.3 and Visual studio 2008
LINK : fatal error LNK1181: cannot open input file 'cutil32D.lib'
Any pointers how to solve this?
Since you're compiling the SDK samples, the project files are probably correct. Far more likely is that you haven't built the cutil library. Go to the SDK install directory, then into the "C" directory. You'll see a "common" directory, in there open the cutil.sln solution (or cutil_vc90.sln for VS2008) and build it in release and debug modes for your platform.
Then try your sample again.
The cutil library is used to avoid replicating the same code through all the samples, if you're starting your own project I'd avoid reusing the cutil library and write your own checker. For example, you should probably fail gracefully if you detect a CUDA error rather than just calling exit() as done in cutil.
The cuda.rules file included in the SDK is highly recommended! Using this you can just add .cu files to any project and Visual Studio will know how to compile them and link them in to the final executable. Easy!
Your MSVC project needs to include the library cutil32D.lib to link. Once you specify it as a library the linker needs to include in the final binary artifact this problem will go away. It would seem the library is missing at the location the linker is going to look for it. You'll have to change the library search paths or move that file to a directory in which the linker is already looking.
I ran into the same issue. It turned out not only did I need to build the cutil project but also the shrUtils project under the SDK's shared folder.