I want to create a custom GTK module which should be loaded when I start a GTK application.
Documentation on this topic is rare, I searched a lot but I failed to get it running. I'm on Ubuntu Linux with GTK3 and tried sofar:
Compiled and linked a shared library with the method void gtk_module_init(gint *argc, gchar ***argv[]) inside. As far as I understood, this should be enough to create a simple module. Full code:
#include <iostream>
#include <gtk/gtk.h>
void gtk_module_init(gint *argc, gchar ***argv[]) {
std::cout << "huhu" << std::endl;
}
Put this lib into /usr/lib/x86_64-linux-gnu/gtk-3.0/modules/libtest-gtk-module.so
Tried to launch an application like this: gnomine --gtk-module=libtest-gtk-module.so But all I get is: Gtk-Message: Failed to load module "libtest-gtk-module.so"
So what else has to be done in order to make GTK load this library?
Many thanks in advance!
You need to make the system aware of the library. For a library in a system directory, it should be enough to run ldconfig as root. Take a look at the tutorial here.
[EDIT]
I got the module to load as follows:
Since this is C++ code, you need to make sure the function name isn't name mangled:
extern "C" {
void gtk_module_init(gint *argc, gchar ***argv[]) {
std::cout << "huhu" << std::endl;
}
}
I built it with the following:
g++ -fPIC -shared -Wl,-soname,libfoo.so.1 -olibfoo.so.1.0.1 `pkg-config --libs --cflags gtk+-3.0` t.c
I used an absolute path to avoid messing with ldconfig, this is probably the best thing to do while developing the module:
~$ gedit --gtk-module=/home/eric/libfoo.so.1.0.1 t.c
huhu
This is on Mint LMDE, not Ubuntu, but I don't think it matters.
Try to run it with strace:
strace -eopen add_your_command_here 2>&1 | grep libtest-gtk-module.so
You'll find out where your program is looking for that file.
Related
I was trying use build wxWidgets-3.1.3 with MinGW-W64 on a x64 windows machine.
I followed this thread, which lead me to download and building. So I installed it and some youtube videos said I need to build it now. So navigate to the installed folder and gave this command :
mingw32-make -f makefile.gcc BUILD=release SHARED=1 MONOLITHIC=1 UNICODE=1.
It took almost half an hour and now it's giving me error saying :
collect2.exe: error: ld returned 1 exit status
makefile.gcc:5329: recipe for target '..\..\lib\gcc_dll\wxmsw313u_gcc_custom.dll' failed
mingw32-make: *** [..\..\lib\gcc_dll\wxmsw313u_gcc_custom.dll] Error 1
Here is the full log file :
https://pastebin.com/zxeHhF6K
MinGW configuration :
Version : 8.1.0
Architecture : x86_64
Threads : posix
Exceptions : seh
Build version : 0
How can I solve this? I'm using CLion, is there any other short or easy way?
The relevant error is
..\..\lib\gcc_dll/libwxexpat.a(wxexpat_xmlparse.o):xmlparse.c:(.text+0x337d): undefined reference to `_imp__rand_s'
and it's very strange because MinGW-w64 8.1 is definitely supposed to have rand_s(). Are you sure you're using the right compiler? I.e. what does g++ -v give you if you run it from the same command prompt?
My only hypothesis is that it's some different (and much older) compiler and the solution would be to just use the right one instead.
Also, the next time you could use -j4 option with make if you have at least 4 logical CPUs in your machine (and chances are you do nowadays), to significantly speed up the build.
Looking back in my notes I once had an issue with missing rand_s() when building glib2 on a certain MinGW build.
I was able to fix it then by adding this at the top of the C file that called this function:
#include <time.h>
#include <stdlib.h>
int rand_s (unsigned int* r)
{
static int srand_called = 0;
if (!srand_called) {
srand(time(0));
srand_called++;
}
if (r)
*r = rand();
return 0;
}
In your case that would be in xmlparse.c.
I am trying to use the library found here:
https://tmrh20.github.io/RF24/RPi.html
I am running an RPi 2 B+ with Raspbian current 11/12/15
I have the example working on Arduino and I have no issues communicating Arduino to Arduino. However when attempting to use the RPi example I end up with this error.
pi#raspberrypi ~/Desktop/rf24 $ cd rf24libs/RF24/examples_RPi/
pi#raspberrypi ~/Desktop/rf24/rf24libs/RF24/examples_RPi $ make
g++ -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -Wall -I../ -lrf24-bcm transfer.cpp -o transfer
transfer.cpp: In function ‘int main(int, char**)’:
transfer.cpp:129:10: error: ‘sleep’ was not declared in this scope
sleep(2);
^
Makefile:32: recipe for target 'transfer' failed
make: *** [transfer] Error 1
The instructions are incredibly simple:
wget http://tmrh20.github.io/RF24Installer/RPi/install.sh
chmod +x install.sh
./install.sh
cd rf24libs/RF24/examples_RPi
make
sudo ./gettingstarted
So I would expect something that is "out of the box" to function normally correct? Apparently not...
I also have the library that is required for the build, found here:
http://www.airspayce.com/mikem/bcm2835/
I have it installed and ready to go. But in order to continue I need to be able to get this basic gettingstarted example to function. I am new to using GPIO but I have followed the diagram on this page:
https://raspberrypi.stackexchange.com/questions/22490/rf24-communication-with-arduino
TL;DR
I cannot get the basic example to function based off code found in a well documented and commonly used library using RF24 modules utilizing RPi and the gettingstarted example included in the library.
I invite you to download this and try installing it yourselves on your RPi to see if we all have the same issues. Maybe we can solve this once and for all.
Any help will be much appreciated and I will be monitoring this thread.
Thank you.
Add the following include below the existing includes in transfer.cpp... It'll look like this...
#include <cstdlib>
#include <iostream>
#include <sstream>
#include <string>
#include <RF24/RF24.h>
#include <unistd.h>
Afterwords verify that sleep is lowercase:
if (role == role_ping_out){
sleep(2);
printf("Initiating Basic Data Transfer\n\r");
Should compile now...
I'm working and on a large C++ project and making it compile with clang would be painful, so I'm stuck with GCC.
I want to use the nice -fsanitize=leak flag that I already used with clang on a previous job, but it does not seem to work.
I made a very simple example to test it:
#include <stdlib.h>
void FooBar() {
malloc(7);
}
int main() {
FooBar();
return 0;
}
With clang it works as expected:
>> clang -fsanitize=leak main.cpp
>> LSAN_OPTIONS=detect_leaks=1 ./a.out
=================================================================
==18052==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 7 byte(s) in 1 object(s) allocated from:
#0 0x41dcbc (~/dev/addresssanitizertest/a.out+0x41dcbc)
#1 0x431ac3 (~/dev/addresssanitizertest/a.out+0x431ac3)
#2 0x431ae3 (~/dev/addresssanitizertest/a.out+0x431ae3)
#3 0x7f8077e71a3f (/lib/x86_64-linux-gnu/libc.so.6+0x20a3f)
SUMMARY: LeakSanitizer: 7 byte(s) leaked in 1 allocation(s).
>>
But with gcc it does not seem to detect anything:
>> gcc -fsanitize=leak main.cpp
>> LSAN_OPTIONS=detect_leaks=1 ./a.out
>>
Did I miss something like a nice environment variable? Did someone ever made it work with gcc?
EDIT: This works for instance:
g++ -fsanitize=address main.cpp
ASAN_OPTIONS=detect_leaks=1 ./a.out
But I can't do that: the perf drawback is too much. I only want leak detection.
You must read this and use the patch :
https://gcc.gnu.org/ml/gcc-patches/2013-11/msg01874.html
I resolved it with gcc 5.1 (I was using 4.9).
EDIT: it looks like 5.2 does not work either
EDIT2: it does not work with the gcc provided with ubuntu 15.10 (5.2.1), however I recompiled a 5.2.0 from sources and it worked fine. I really have no clue.
I had the same issue (with Ubuntu 15.04 and gcc 4.9.2).
Using ldd I noticed that liblsan.so was not linked, so here how I fixed it :
1) Force linking during compilation
>> gcc -fsanitize=leak main.cpp -llsan
2) Execute with
./a.out
I recently installed the hdf5 library on an ubuntu machine, and am now having trouble linking to the exported functions. I wrote a simple test script readHDF.cpp to explain the issue:
#include <hdf5.h>
int main(int argc, char * argv[])
{
hid_t h5_file_id = H5Fopen(argv[1], H5F_ACC_RDWR, H5P_DEFAULT);
return 0;
}
The compile command is
g++ -Wl,-rpath,$HOME/hdf5/lib -I$HOME/hdf5/include \
-L$HOME/hdf5/lib -l:$HOME/hdf5/lib/libhdf5.so readHDF.cpp
which returns the following error
/tmp/cc6DXdxV.o: In function `main':
readHDF.cpp:(.text+0x1f): undefined reference to `H5check_version'
readHDF.cpp:(.text+0x3c): undefined reference to `H5Fopen'
collect2: ld returned 1 exit status
I am confused because the nm command seems to say that the function has been exported:
nm -C $HOME/hdf5/lib/libhdf5.so | grep H5check_version
which returns
0000000000034349 T H5check_version
and a similar result for H5Fopen. Any thoughts on what might be going wrong? Not sure if it helps, but if I comment out the H5Fopen portion of the script, then it compiles fine:
#include <hdf5.h>
int main(int argc, char * argv[])
{
hid_t h5_file_id;// = H5Fopen(argv[1], H5F_ACC_RDWR, H5P_DEFAULT);
return 0;
}
Also there are multiple versions of hdf5 installed on the server which are used by various python modules such as h5py and tables, but I couldn't get any of them to work, so I installed this version in my local directory and changed the rpath options for g++ linker.
Ok, solved. The issue was in the placement of the -lhdf5 in the compile command. Apparently -lhdf5 should be placed after readHDF.cpp. For instance g++ -Wl,-rpath=$HOME/hdf5/lib -L$HOME/hdf5/lib -I$HOME/hdf5/include readHDF.cpp -lhdf5 will compile with no problems, but g++ -Wl,-rpath=$HOME/hdf5/lib -L$HOME/hdf5/lib -I$HOME/hdf5/include -lhdf5 readHDF.cpp will fail with the undefined reference errors. Interestingly, this was only a problem for Ubuntu 12.04, as both compile commands worked for Ubuntu 10.04.
Found the answer with explanation at this post:
undefined reference to symbol even when nm indicates that this symbol is present
I guess placing -lXXX after the script is safer practice.
This is not a bug. See
C++ shared library undefined reference to `FooClass::SayHello()'
"Recent versions of GCC reuqire that you put the object files and libraries in the order that they depend on each other ..."
You forgot to put -lhdf5 in the compile command. Also, there's no need for -l:$HOME/hdf5/lib/libhdf5.so
This should work: $ g++ -Wl,-rpath,$HOME/hdf5/lib -I$HOME/hdf5/include -L$HOME/hdf5/lib -lhdf5 readHDF5.cpp
I'm currently trying to learn how to use the FreeType2 library for drawing fonts with OpenGL. However, when I start the program it immediately crashes with the following error: "(Can't correctly start the application (0xc000007b))"
Commenting the FT_Init_FreeType removes the error and my game starts just fine. I'm wondering if it's my code or has something to do with loading the dll file.
My code:
#include "SpaceGame.h"
#include <ft2build.h>
#include FT_FREETYPE_H
//Freetype test
FT_Library library;
Game::Game(int Width, int Height)
{
//Freetype
FT_Error error = FT_Init_FreeType(&library);
if(error)
{
cout << "Error occured during FT initialisation" << endl;
}
And my current use of the FreeType2 files.
Inside my bin folder (where debug .exe is located) is: freetype6.dll, libfreetype.dll.a, libfreetype-6.dll.
In Code::Blocks, I've linked to the lib and include folder of the FreeType 2.3.5.1 version.
And included a compiler flag: -lfreetype
My program starts perfectly fine if I comment out the FT_Init function which means the includes, and library files should be fine.
For people who might stumble upon the same problem and can't find it out. I'll post my solution:
It seemed the error code ussualy comes up with loading .dll's. I used process explorer to check if my program was actually loading the correct .dll but it wasn't. I deleted my FreeType dll's and replaced them with a version compiled specifically for my version of windows to make sure I have the right dll's. Replacing the old one with the new one helped.
I had the same problem, turnes out that I had forgotten to copy over the zlib1.dll file.
I had the same "cant correctly start" error. It turned out my program was finding a zlib1.dll in something like c:\intel\wifi\bin, that DependencyWalker flagged as AMD64 (my PC is Win7 64, but my app is 32 bits.) It was fixed when I copied freeType's zlib1.dll to SysWOW64. Tough nut to crack!