Mingw-w64 Unable to link version library

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  I am trying to fetch the outlook mails into my application where i can get only few mails around 7 by using micosoft.office.interop.outlook.dll.
• How to pass (rapidly updated) variable from ctypes C code to Python? Pass by reference?

  I'm trying to develop C code that will be compiled to a DLL (or .SO for linux) with the purpose of processing some external input at high speed and returning the result to Python for follow-on processing.

  My question is: what's the best way to regularly return values (at >1000s of time a second) from a C function for use in Python?

  I created a test case as follows:

  //dummy_function.c
  #include <stdio.h>
  #include <Windows.h>
  
  __declspec(dllexport) int runme() {
      int i;
      for (i=1; i<= 500; i++) {
          printf("int = %d \n", i);
          Sleep(100);  // Add some arbitrary delay for now
      }
  }
  

  NB, I import Windows.h to use a dummy time delay (simulating my real-world problem). This code could run on unix using unistd.h instead (according to: What is the proper #include for the function 'sleep' in C?)

  This code is then compiled into a .dll by

  gcc -shared -o dummy_function.dll dummy_function.c
  

  and imported in Python by:

  import ctypes
  libc = ctypes.CDLL('dummy_function.dll')
  libc.runme()  # Start running
  

  When executing this Python code, it does print out the increasing integers. However, catching the printed output from C using Python and then processing it doesn't seem like a good way to do this (/not scalable for high speed).

  Instead, I wonder if there's a way to more easily pass variables to Python from the DLL. I guess I don't want to use the return function in C as this exits the function.

  I've read about passing by reference in C, so wonder if this is compatible with ctypes. Could I define some memory location that the C code writes into, and the Python then polls this? Or better, some form of queue / buffer to avoid missing events?

  Any advice would be greatly appreciated, thanks!
• Why does get proc address fail when using a handle for the DLL from a 32bit process?

  I have an application that is running as a 64 bit application on a 64 bit OS, it enumerates information about other processes running on the machine.

  When the process enumerates information about a 32bit application running on the machine it can get a handle for all the running modules (such as Kernel32.dll etc) however it fails when trying to call GetProcAddress on functions using these module handles (module handles are acquired using EnumProcessModulesEx) and the handles seem to be accurate as they work when calling GetModuleFileNameEx.

  GetProcAddress fails with the error: The specified module could not be found

  Does anyone know why this function is failing in this way? For clarity when running against a 64bit process (instead of a 32bit process) GetProcAddress works as intended.
• Files added from "p4 add" not showing up in p4v default changelist

  I have a P4CONFIG file that sets up necessary environment. Then I p4 add /path/to/myfile.ext, which gives me

  //Depot/relative/path/to/myfile.ext - currently opened for add
  

  But when opening my p4v of the same workspace, the file isn't in the default changelist. I've also tried

  p4 add -f /path/to/...
  

  And the result is the same.

  What am I missing?
• Export to EXCEL from SQL Server 2017 Reporting Services using command line

  Using command line to export report from SQL Server Reporting Services (RDL) to Excel format.

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• Reading Command Line Output with popen Returns No Data

  I am running a ImageMagick command to convert an image to a PPM format. I would like to then read the output from the command line to see if it was successful.

  I looked up the popen command and tried to implement it with my code:

  std::string Image::loadImage(std::string baseFileAddress) {
  
  struct stat statBuffer;                                     //check if file exists
  if (stat (baseFileAddress.c_str(), &statBuffer) == 0) {
      std::cout << "File found.\n";
  } else {
      std::cout << "Error! File for processing not found.\n";
      exit;
  }
  
  std::string data;
  FILE * stream;
  const int max_buffer = 256;
  char buffer[max_buffer];
  std::string cmd = "convert -compress none " + baseFileAddress + " " + baseFileAddress + "_new.ppm";
  
  stream = popen(cmd.c_str(), "r");
  if (stream) {
      while (!feof(stream)) {
          if (fgets(buffer, max_buffer, stream) != NULL) {
              data.append(buffer);
          }
      }
      pclose(stream);
  }
  std::cout << data;
  return data;
  }
  

  After running the command, output is printed to the command line however, data does not print anything and turns out to be an empty string when I want it to contain the output of the command.
• Execution failed for task ':app:checkDebugDuplicateClasses'

  I manually implement 28.0.0 dependency but I found duplicate dependency(28.0.0 and 24.0.0) so i want to exclude or remove this(support:24.0.0) dependency from my gradle file

  dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      testImplementation 'junit:junit:4.12'
      implementation files('libs/gcm.jar')
      implementation 'com.android.support:appcompat-v7:28.0.0'
      implementation "com.android.support:support-core-utils:28.0.0"
      implementation 'com.android.support:design:28.0.0'
      implementation 'com.google.android.gms:play-services-maps:10.2.1'
      implementation 'com.google.android.gms:play-services-gcm:10.2.1'
      implementation 'com.android.support:recyclerview-v7:28.0.0'
      implementation 'com.android.support:cardview-v7:28.0.0'
      implementation files('libs/httpclient-4.3.6.jar')
      implementation files('libs/httpcore-4.3.3.jar')
      implementation files('libs/httpmime-4.3.6.jar')
      implementation files('libs/Shutterbug-1.0.0.jar')
      implementation files('libs/YouTubeAndroidPlayerApi.jar')
      implementation files('libs/picasso-2.5.2.jar')
      implementation 'com.mcxiaoke.volley:library-aar:1.0.0'
      implementation 'com.github.siyamed:android-shape-imageview:0.9.+@aar'
      implementation 'com.github.bumptech.glide:glide:3.7.0'
      implementation 'com.google.android.gms:play-services-analytics:10.2.1'
      implementation 'com.google.firebase:firebase-messaging:10.2.1'
      implementation 'com.firebase:firebase-client-android:2.5.2'
  }
  apply plugin: 'com.google.gms.google-services'
  
• How to find out the minimal version of required library of my python project?

  Intro:

  I have a python project, bestproj, which requires the python library awesomelib (included into requirements.txt used by setuptool). awesomelib is a well maintained project, with several versions. So some versions of awesomelib are not compatible with my bestproj.

  Goal:

  Fill the requirements.txt properly, like this:

  awesomelib>=0.2,!=1.11
  

  Q:

  Is there any automated way (not to install manually all versions of all dependencies and run all of my unittest) to test my bestproj project with different version of awesomelib

  • to get the minimal version of awesomelib
  • get the blacklisted versions, which are not compatible with my bestproj?
• Downgrading from Vim 8.1 to Vim 7.4 in (L)Ubuntu 14.04

  I firstly installed Vim in my (L)Ubuntu 14.04 with sudo apt-get install vim After that, as required from a plugin I wanted to use, I upgraded to Vim 8.1 using the ppa:jonathonf/vim repository. Being disappointed by that plugin I wanted to try another one but it has a still unsolved bug in Vim 8.1, this is why I now need to downgrade to Vim 7.4. My idea is to completely uninstall Vim and then reinstall it (having already removed ppa:jonathonf/vim).

  To do so I tried

  sudo apt-get purge vim
  

  and

  sudo apt-get autoremove
  

  a couple of times and now I get this:

  user@computerName:~$ sudo apt-get purge vim
  [sudo] password for user: 
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Package 'vim' is not installed, so not removed
  0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
  

  However, Vim is still there and I can use it. If I check for Vim version within Vim I get this:

  :ve
  VIM - Vi IMproved 8.1 (2018 May 18, compiled May 15 2019 14:58:47)
  

  Perhaps there is an easier way to downgrade a software in Linux? Or is my idea valid? Do you have any suggestion? Thank you!

  As advised by GiftZwergrapper:

      user@computerName:~$ which vim
      /usr/bin/vim
  
• why can my gcc command not have -static parameter

  I usually use gcc to compile my C program, it works ok, but when I tried to compile static library with -static parameter it always failed. Although I tried some solutions on google, but it still didn't get fixed.

  My command is as follows:

  gcc mycode.c  -static  -L .  -lurl -lcap  -o mycode
  

  The error message is:

  /usr/bin/ld: cannot find -lc
  collect2: error: ld returned 1 exit status
  

  but when I remove -static it works very well.
• stm32 : undefined reference to arm file

  I am writing a code on stm32L4 to apply a IIR filter on a Test input signal called aFIR_F32_1kHz_15kHz. So a wrote the following procedure, taking example on the fir_processing.c procedure

  float a[4] = {1,-1.757185850099298,0.7719255279472969,9.210998201619528e-17};
  float b[3] = {0.7759506578371728,-1.558663163677561,0.7827125058403885};
  
  void IIR_PROCESSING(void)
  {
      float32_t aIIR_F32_Output[TEST_LENGTH_SAMPLES];
      arm_iir_lattice_instance_f32 IIR_F32_Struct;
      uint32_t counter_IIR_f32_p;
      int numStages = 3;
      float iirStateF32[numStages+BLOCKSIZE];
  
      arm_iir_lattice_init_f32(&IIR_F32_Struct, numStages, &b[0], &a[0], &iirStateF32[0], BLOCKSIZE);
  
      for (counter_IIR_f32_p = 0; counter_IIR_f32_p < 240/32; counter_IIR_f32_p++)
      {
          arm_iir_lattice_f32(&IIR_F32_Struct, aFIR_F32_1kHz_15kHz + (counter_IIR_f32_p * BLOCKSIZE), aIIR_F32_Output + (counter_IIR_f32_p * BLOCKSIZE), BLOCKSIZE);
      }
  
      char* val[10];
  
      for (int j = 0; j<TEST_LENGTH_SAMPLES; j++)
      {
          sprintf(val, "%f", aIIR_F32_Output[j]);
          HAL_UART_Transmit(&huart2, val, sizeof(val), HAL_MAX_DELAY);
          HAL_UART_Transmit(&huart2, ",", 1, HAL_MAX_DELAY);
      }
      HAL_UART_Transmit(&huart2, "\r\n", 2, HAL_MAX_DELAY);
  }
  

  When I compile this code, There is no problem, but when I place the procedure in my main, I have the following errors:

  C:\working\Test_Filtre\Debug/../Src/main.c:81: undefined reference to `arm_iir_lattice_init_f32'
  C:\working\Test_Filtre\Debug/../Src/main.c:85: undefined reference to `arm_iir_lattice_f32'
  

  Knowing that I include the arm_math.h file at the beginning of my code, I don't understand why I have those errors.
• How do I compile the my application with static library?

  I am currently trying to use reactphysics3d library to make simple pariticle collision simulator. https://www.reactphysics3d.com/

  I tried to compile my c++ file with the static library but it doesn't compile well. The directory structure is something like this.

  ParticleSimulation
   |
   |-- test.cpp
   |    
   |-- lib  
   |   |-- libreactphysics3d.a
   |    
   |-- reactphysics3d
   |   |-- src
   |       |-- reactphysics3d.h
  

  My test code is

  #include "reactphysics3d.h"
  
  using namespace reactphysics3d;
  
  int main() {
      rp3d::SphereShape * sphereShape = new SphereShape(1.0);
      delete sphereShape;
  }
  

  I tried to compile with

  gcc -std=c++11 -I ./reactphysics3d/src/ -o myapp test.cpp ./lib/libreactphysics3d.a
  

  The error message is too messy to post here. The last line of the error message is

  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  

  I feel very uncomfortable with compiling c/c++ project with gcc/g++ compiler. Could you help me to figure the problem? Thank you.
• cannot print when using vector

  I am trying to use a std::vector<int> in my .cpp-file. But it just prints nothing though it should print some text. The code is very simple but I do not know why it doesn't work properly.

  I am using Mingw-w64. I tried g++ and g++ -std=c++11 but it won't work. If i remove and all related stuff, it works fine with cout to print. so it should be vector issue, any idea about that?

  #include <iostream>
  #include <vector>
  
  using namespace std; 
  
  int main()
  {
      vector<int> g1(5,20); 
  
      for (int i = 1; i <= 5; i++) 
          g1.push_back(i); 
  
      cout << "Output of begin and end: "; 
      for (auto i = g1.begin(); i != g1.end(); ++i) 
          cout << *i << " "; 
  }
  
• How can I build Qt with link-time optimization using mingw-w64?

  Building Qt 5.12.3 with mingw-w64 using g++ 8.1.0 works well. But as soon as I add the option -ltcg to the configure parameters, I get build errors.

  The configure call looks like this:

  ../qt5/configure -prefix ../qt5Install -release -recheck-all -ltcg -confirm-license -opensource -platform win32-g++ -opengl desktop -nomake examples -nomake tests -system-freetype -I /c/Libraries/OpenCascade/3rdPartyMingw64/freetype-2.6.3-mingw-64/include -L/c/Libraries/OpenCascade/3rdPartyMingw64/freetype-2.6.3-mingw-64/bin -skip qtconnectivity -skip qtdeclarative -skip qtlocation -skip qtmultimedia -skip qtquickcontrols -skip qtquickcontrols2 -skip qtsensors -skip qtwebsockets -skip qtwinextras -skip qtwebchannel -skip qtwebengine
  

  Has anyone managed to build Qt with link-time optimization using mingw-w64? What is the trick?

  The build errors here are:

  g++ -Wl,-s -shared -fno-keep-inline-dllexport -O3 -std=c++1z -fno-exceptions -flto -Wl,-subsystem,windows -Wl,--out-implib,C:/Libraries/qt/qt5Build/qtbase/lib/libQt5Gui.a -o ../../lib/Qt5Gui.dll @object_script.Qt5Gui.Release  -LC:/Libraries/OpenCascade/3rdPartyMingw64/freetype-2.6.3-mingw-64/bin -LC:/Libraries/qt/qt5Build/qtbase/lib C:/Libraries/qt/qt5Build/qtbase/lib/libQt5Core.a .obj/release/Qt5Gui_resource_res.o C:/Libraries/qt/qt5Build/qtbase/lib/libqtlibpng.a -LC:/Libraries/OpenCascade/3rdPartyMingw64/freetype-2.6.3-mingw-64/bin C:/Libraries/qt/qt5Build/qtbase/lib/libqtharfbuzz.a C:/mingw-w64-8.1/mingw64/x86_64-w64-mingw32/lib/libz.a -lgdi32 -lcomdlg32 -loleaut32 -limm32 -lwinmm -lws2_32 -lole32 -luuid -luser32 -ladvapi32 C:/mingw-w64-8.1/mingw64/x86_64-w64-mingw32/lib/libglu32.a C:/mingw-w64-8.1/mingw64/x86_64-w64-mingw32/lib/libopengl32.a C:/mingw-w64-8.1/mingw64/x86_64-w64-mingw32/lib/libgdi32.a C:/mingw-w64-8.1/mingw64/x86_64-w64-mingw32/lib/libuser32.a
  .obj/release/qimage_compat.o (symbol from plugin):(.gnu.linkonce.t._ZTS12QPaintDevice+0x0): multiple definition of `typeinfo name for QPaintDevice'
  .obj/release/qimage_ssse3.o:qimage_ssse3.cpp:(.rdata$_ZTS12QPaintDevice[_ZTS12QPaintDevice]+0x0): first defined here
  .obj/release/qimage_compat.o (symbol from plugin):(.gnu.linkonce.t._ZTI12QPaintDevice+0x0): multiple definition of `typeinfo for QPaintDevice'
  .obj/release/qimage_ssse3.o:qimage_ssse3.cpp:(.rdata$_ZTI12QPaintDevice[_ZTI12QPaintDevice]+0x0): first defined here
  .obj/release/qimage_compat.o (symbol from plugin):(.gnu.linkonce.t._ZTS6QImage+0x0): multiple definition of `typeinfo name for QImage'
  .obj/release/qimage_ssse3.o:qimage_ssse3.cpp:(.rdata$_ZTS6QImage[_ZTS6QImage]+0x0): first defined here
  

  ...

  .obj/release/qimage.o (symbol from plugin):(.gnu.linkonce.t._ZTI18QRasterPaintEngine+0x0): multiple definition of `typeinfo for QRasterPaintEngine'
  .obj/release/qdrawhelper_sse4.o:qdrawhelper_sse4.cpp:(.rdata$_ZTI18QRasterPaintEngine[_ZTI18QRasterPaintEngine]+0x0): first defined here
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-shaper-list.hh:43:1: warning: '_hb_ot_shaper_shape_plan_data_create' violates the C++ One Definition Rule  [-Wodr]
   HB_SHAPER_IMPLEMENT (ot) /* <--- This is our main OpenType shaper. */
   ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-ot-shape.cc:171:1: note: return value type mismatch
   _hb_ot_shaper_shape_plan_data_create (hb_shape_plan_t    *shape_plan,
   ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-private.hh:37:8: note: type name 'hb_ot_shape_plan_t' should match type name 'hb_ot_shaper_shape_plan_data_t'
   struct hb_ot_shape_plan_t
          ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-shaper-list.hh:43:1: note: the incompatible type is defined here
   HB_SHAPER_IMPLEMENT (ot) /* <--- This is our main OpenType shaper. */
   ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-ot-shape.cc:171:1: note: '_hb_ot_shaper_shape_plan_data_create' was previously declared here
   _hb_ot_shaper_shape_plan_data_create (hb_shape_plan_t    *shape_plan,
   ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-shaper-list.hh:43:1: warning: '_hb_ot_shaper_shape_plan_data_destroy' violates the C++ One Definition Rule  [-Wodr]
   HB_SHAPER_IMPLEMENT (ot) /* <--- This is our main OpenType shaper. */
   ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-ot-shape.cc:200:1: note: type mismatch in parameter 1
   _hb_ot_shaper_shape_plan_data_destroy (hb_ot_shaper_shape_plan_data_t *plan)
   ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-private.hh:37:8: note: type name 'hb_ot_shape_plan_t' should match type name 'hb_ot_shaper_shape_plan_data_t'
   struct hb_ot_shape_plan_t
          ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-shaper-list.hh:43:1: note: the incompatible type is defined here
   HB_SHAPER_IMPLEMENT (ot) /* <--- This is our main OpenType shaper. */
   ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-ot-shape.cc:200:1: note: '_hb_ot_shaper_shape_plan_data_destroy' was previously declared here
   _hb_ot_shaper_shape_plan_data_destroy (hb_ot_shaper_shape_plan_data_t *plan)
   ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-shaper-list.hh:43:1: warning: '_hb_ot_shaper_face_data_destroy' violates the C++ One Definition Rule  [-Wodr]
   HB_SHAPER_IMPLEMENT (ot) /* <--- This is our main OpenType shaper. */
   ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-ot-shape.cc:140:1: note: type mismatch in parameter 1
   _hb_ot_shaper_face_data_destroy (hb_ot_shaper_face_data_t *data)
   ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-ot-layout-private.hh:154:8: note: type name 'hb_ot_layout_t' should match type name 'hb_ot_shaper_face_data_t'
   struct hb_ot_layout_t
          ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-shaper-list.hh:43:1: note: the incompatible type is defined here
   HB_SHAPER_IMPLEMENT (ot) /* <--- This is our main OpenType shaper. */
   ^
  C:/Libraries/qt/qt5/qtbase/src/3rdparty/harfbuzz-ng/src/hb-ot-shape.cc:140:1: note: '_hb_ot_shaper_face_data_destroy' was previously declared here
   _hb_ot_shaper_face_data_destroy (hb_ot_shaper_face_data_t *data)
   ^
  collect2.exe: error: ld returned 1 exit status
  mingw32-make[4]: *** [Makefile.Release:1219: ../../lib/Qt5Gui.dll] Error 1
  
• mingw64 system("command") not same as "command" in shell

  A program "execinput" reads input lines from stdin and stores them into a character array "buffer" and then does this:

  system(buffer);
  

  Let "command" be any valid set of programs, parameters, and bash syntax. Ideally the next two lines would give the same result (neglecting for the moment the handling of any double quotes within "command"):

  command
  echo "command" | execinput
  

  That is indeed the case on a linux system running in a bash shell. However, in bash in an "Msys2 MingW 32bit" shell this happens (trailing semicolon after the 3 is intentional):

  echo 1; echo 2; echo 3;
  1
  2
  3
  echo "echo 1; echo 2; echo 3;" | execinput
  1 ; echo 2; echo 3;
  echo "echo 1 & echo 2 & echo 3;" | execinput
  1
  2
  3;
  

  The "&" character is what cmd.exe uses to separate sub-commands. That last command on a linux system, either directly in bash or through system() gives:

  3
  1
  2
  

  In the linux bash environment all the commands come out the same, whether run directly or via system() in execinput(). In the MSYS2 environment they don't.

  I believe that COMSPEC and PATH are involved somehow but having set the former like so:

   export COMSPEC="C:\progs\msys32\usr\bin\bash.exe -c "
  

  instead of the default COMSPEC value of:

  C:\Windows\system32\cmd.exe
  

  the results still were not the same.

  Can somebody please explain what is going on here, and hopefully, how to make "command" come out the same directly on a bash command line and when invoked with system()?

  ---

  More info. In a bash command line in MSYS2:

  echo 'set' | execinput > short.txt
  echo 'bash -c "set"' | execinput > long.txt
  

  then compare the file contents. key differences are:

  1. long.txt has 11 BASH *symbols plus DIRSTACK, EUID, GROUPS, IFS, MACHTYPE, OPTERR, OPTIND, OSTYPE, PPID, SHELLOPTS,UID.
     Short.txt does not have these.
  2. SYSTEMROOT, COMSPEC, CONTITLE, HOMEPATH, and many others are in single quotes in long.txt, no quotes in short.txt.
     The strings are otherwise the same.
  3. PWD is in fully linux/posix syntax in long.txt and has its root at the top of the MSYS2 file system. PWD is in hybrid syntax in short.txt (starts with C: then has a / delimited path) and is the full Windows path.
  4. PATH in long.txt starts with linux/posix syntax entries, root at the top of the MSYS2 file system, then followed by entries like /c/Windows/System32. Short.txt has entries which are in full Windows syntax.
  5. Long.txt has SHLVL=2, short.txt has SHLVL=1.