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Hello everyone,
I made a class that will do some additional configuration to the serial port. (Mainly to handle received data).
My issue is that SerialPort_DataReceived() is successfully triggered when it received data from device, however the BytesToRead is always 0. What could the reason be? I am sure the device is sending data because when I haven't use this ConfigSerialPort, everything works fine.
ConfigSerialPort.h
#pragma once
using namespace System::Windows::Forms;
ref class ConfigSerialPort: public System::Windows::Forms::Control
{
private: System::IO::Ports::SerialPort^ _serialPort;
public:
ConfigSerialPort(System::IO::Ports::SerialPort^ serialPort) {
_serialPort = serialPort;
_serialPort->DataReceived += gcnew System::IO::Ports::SerialDataReceivedEventHandler(this, &ConfigSerialPort::SerialPort_DataReceived);
}
private: System::Void SerialPort_DataReceived(System::Object^ sender, System::IO::Ports::SerialDataReceivedEventArgs^ e)
{
unsigned int test = 0;
test = _serialPort->BytesToRead;
}
}
MyForm.h
#pragma once
#include <stdlib.h>
#include <string.h>
#include <cstdint>
#include <stdio.h>
#include "ConfigSerialPort.h"
namespace SerialPortGUI {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace System::IO;
using namespace System::Runtime::Serialization::Formatters::Binary;
public ref class MyForm : public System::Windows::Forms::Form
{
public:
MyForm(void)
{
InitializeComponent();
}
.
.
.
void InitializeComponent(void)
{
.
.
.
this->Load += gcnew System::EventHandler(this, &MyForm::MyForm_Load);
this->MyForm_SerialPort = (gcnew System::IO::Ports::SerialPort(this->components));
.
.
.
}
private: ConfigSerialPort^ test;
private: System::Void MyForm_Load(System::Object^ sender, System::EventArgs^ e) {
test = gcnew ConfigSerialPort(MyForm_SerialPort);
}
}
}
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What is the serial port connected to, and how can you tell there is data to be read?
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Hello, my other device is an Arduino that connects to PC as Com port 8. Every time I press a button on Arduino, it will transmit a text over serial to the PC. I have verified the received text using Termite software.
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It's impossible to guess why your receiver thinks there is no data to read, if it is being transmitted.
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The only think I could think of is inside
ConfigSerialPort.h
I should use gcnew for _serialPort
_serialPort = gcnew (System::IO::Ports::SerialPort); , and then assign it the parameter
_serialPort = serialPort
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I made a class myGroupbox to use SerialPort, and I'm trying to update a textbox from the serial port data. But the invoke function couldn't be used, the error message is "myGroupbox has no member invoke"
here's my code
myGroupbox.h
#pragma once
using namespace System::Windows::Forms;
ref class myGroupbox
{
private: System::IO::Ports::SerialPort^ _serialPort;
public:
myGroupbox( System::IO::Ports::SerialPort^ serialPort )
{
_serialPort=serialPort;
_serialPort->DataReceived += gcnew System::IO::Ports::SerialDataReceivedEventHandler(this, &myGroupbox::SerialPort_DataReceived);
}
private: System::Void SerialPort_DataReceived(System::Object^ sender,System::IO::Ports::SerialDataReceivedEventArgs^ e)
{
uint16_t test = 0;
test = _serialPort->BytesToRead;
if (test == 3U) {
this->Invoke(gcnew EventHandler(this, &myGroupbox::ProcessReceived));
}
else
{
_serialPort->DiscardInBuffer();
}
}
private: System::Void ProcessReceived(System::Object^ sender, System::EventArgs^ e)
{
}
}
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Member 15150778 wrote: the invoke function couldn't be used, the error message is "myGroupbox has no member invoke"
Well, you hadn't defined any Invoke() method in your myGroupbox class. Therefore you got this error message.
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Hello, I tried to copy my approach from the MyForm.cpp and it worked properly i.e. invoke wasn't define in MyForm.cpp but I could still call this invoke function since it's from System::Windows::Forms::Controls.
But in my own class myGroupBox, it couldn't do the same.
here's an snippet of MyForm.cpp that used the invoke and worked
using namespace System;
using namespace System::Windows::Forms;
[STAThreadAttribute]
void main(array<String^>^ args) {
Application::EnableVisualStyles();
Application::SetCompatibleTextRenderingDefault(false);
myGUI ::MyForm form;
Application::Run(% form);
}
namespace myGUI {
System::Void MyForm::serialPort1_DataReceived(System::Object^ sender, System::IO::Ports::SerialDataReceivedEventArgs^ e) {
if (serialPort1->IsOpen) {
databufferA = serialPort1->ReadLine();
this->Invoke(gcnew EventHandler(this, &MyForm::DisplayText));
}
}
}
modified 20-May-21 2:41am.
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Yes, because you have still not declared an Invoke method in your class, and your class is not a child of System.Windows.Forms.Control .
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Hello, thank you very much for your help! I am able to compile after following your suggestion. I will test if this method works and update if this is the final solution.
Thanks again!
myGroupbox.h
#pragma once
using namespace System::Windows::Forms;
ref class myGroupbox: public System::Windows::Forms::Control
{
private: System::IO::Ports::SerialPort^ _serialPort;
.
.
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Sorry if my question is unclear, but I shall explain a bit more in the following.
Suppose I am making a software to show ONLY 2 employee information (i.e. Bob and Tim), and my implementation method is to create 2 identical group box.
Each of this groupbox will have the same UI elements , textbox, checkbox, label and buttons.
In order to reduce duplicated codes , I want to create a common class for this groupbox.
Will this work?
Would there be memory leaks?
I did some google research and found something about using smart pointers instead of gcnew'ing a pointer, is it relevant to prevent memory leaks?
Thank you very much for reading, i appreciate any constructive help /example code to get this code properly working!
common_employee_groupbox.h
#pragma once
ref class common_employee_groupbox
{
private: System::Windows::Forms::CheckBox^ _cb_isAbsent = gcnew (System::Windows::Forms::CheckBox^ );
private: System::Windows::Forms::CheckBox^ _cb_isOverTime gcnew (System::Windows::Forms::CheckBox^ );
private: System::Windows::Forms::TextBox^ _tb_employeeName gcnew (System::Windows::Forms::TextBox^ );
private: System::Windows::Forms::TextBox^ _tb_employeeSalary gcnew (System::Windows::Forms::TextBox^ );
private: System::Windows::Forms::Button^ _btn_increaseSalary gcnew (System::Windows::Forms::Button^ );
private: System::Windows::Forms::Button^ _btn_decreaseSalary gcnew (System::Windows::Forms::Button^ );
public:
common_employee_groupbox(
System::Windows::Forms::CheckBox^ cb_isAbsent,
System::Windows::Forms::CheckBox^ cb_isOverTime,
System::Windows::Forms::TextBox^ tb_employeeName,
System::Windows::Forms::TextBox^ tb_employeeSalary,
System::Windows::Forms::Button^ btn_increaseSalary,
System::Windows::Forms::Button^ btn_decreaseSalary
) {
_cb_isAbsent = cb_isAbsent;
_cb_isOverTime= cb_isOverTime;
_tb_employeeName= tb_employeeName;
_tb_employeeSalary= tb_employeeSalary;
_btn_increaseSalary= btn_increaseSalary;
_btn_decreaseSalary= btn_decreaseSalary;
_btn_increaseSalary->Click += gcnew System::EventHandler(this,&common_employee_groupbox::increaseSalary_Click);
_btn_decreaseSalary->Click += gcnew System::EventHandler(this,&common_employee_groupbox::decreaseSalary_Click);
}
private: System::Void increaseSalary_Click() {
tb_employeeSalary->Text = "updatedsalary xxxx";
}
private: System::Void decreaseSalary_Click() {
tb_employeeSalary->Text = "updatedsalary xxxx";
}
};
MyForm.h
#include "common_employee_groupbox.h"
namespace MyEmployeeGUI {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace System::IO;
using namespace System::Runtime::Serialization::Formatters::Binary;
public ref class MyForm : public System::Windows::Forms::Form
{
private: System::Windows::Forms::CheckBox^ cb_isAbsent_Tim;
private: System::Windows::Forms::CheckBox^ cb_isOverTime_Tim;
private: System::Windows::Forms::TextBox^ tb_employeeName_Tim;
private: System::Windows::Forms::TextBox^ tb_employeeSalary_Tim;
private: System::Windows::Forms::Button^ btn_increaseSalary_Tim;
private: System::Windows::Forms::Button^ btn_decreaseSalary_Tim;
private: System::Windows::Forms::CheckBox^ cb_isAbsent_Bob;
private: System::Windows::Forms::CheckBox^ cb_isOverTime_Bob;
private: System::Windows::Forms::TextBox^ tb_employeeName_Bob;
private: System::Windows::Forms::TextBox^ tb_employeeSalary_Bob;
private: System::Windows::Forms::Button^ btn_increaseSalary_Bob;
private: System::Windows::Forms::Button^ btn_decreaseSalary_Bob;
public:
MyForm(void)
{
InitializeComponent();
}
.
.
.
System::Void MyForm::MyForm_Load(System::Object^ sender, System::EventArgs^ e) {
common_employee_groupbox^ tim_groupbox = gcnew common_employee_groupbox(
cb_isAbsent_Tim,
cb_isOverTime_Tim,
tb_employeeName_Tim,
tb_employeeSalary_Tim,
btn_increaseSalary_Tim,
btn_decreaseSalary_Tim
);
common_employee_groupbox^ bob_groupbox = gcnew common_employee_groupbox(
cb_isAbsent_Bob,
cb_isOverTime_Bob,
tb_employeeName_Bob,
tb_employeeSalary_Bob,
btn_increaseSalary_Bob,
btn_decreaseSalary_Bob
);
}
}
}
Update 1:
I have tried this code, and I'm having errors with this line (the bolded ampersand is highlighted as error) :
_btn_increaseSalary->Click += gcnew System::EventHandler(this,&common_employee_groupbox::increaseSalary_Click);
the error message:
invalid delegate initializer - function does not match the delegate type
How to fix this problem? Already tried googling, but the results aren't helpful
Update 2:
I have fixed the problem from update 1.
it turned out that I need to declare the increase/decrease salary function with the following arguments like below
private: System::Void increaseSalary_Click(System::Object^ sender, System::EventArgs^ e).
I have gotten the code to work as expected, however I'm still unsure if there will be any memory leaks.
Thanks all!
modified 19-May-21 22:45pm.
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I have an pointer to an array of System::Byte pointers, and im trying to use the SerialPort.Write function that only accepts
array<unsigned char>^
It is necessary that I used System::Byte pointers because the value of byte array needs to be update from time to time during runtime.
heres my sample code
System::Void MyForm::button1_Click(System::Object^ sender, System::EventArgs^ e)
{
array<System::Byte^>^ myArray = gcnew array<System::Byte^>(10U);
myArray[0] = (System::Byte) 0x01;
myArray[1] = (System::Byte) 0x02;
myArray[2] = (System::Byte) 0x03;
myArray[3] = (System::Byte) 0x04;
myArray[4] = (System::Byte) 0x05;
myArray[5] = (System::Byte) 0x06;
myArray[6] = (System::Byte) 0x07;
myArray[7] = (System::Byte) 0x08;
myArray[8] = (System::Byte) 0x09;
myArray[9] = (System::Byte) 0x10;
SerialPort1->Write(myArray,0,10U);
object type is: System::IO::Ports::SerialPort ^
}
modified 13-May-21 0:27am.
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I fixed my problem already , Updated from array<system::byte^>^
to array<system::byte>^.
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I'm trying to build a really simple class with member variables and member functions for learning.
I am trying to achieve the following code inside btn_User1_Click, however since user1 is not globally declared, it couldn't find the variable. At the same time, if I tried to declare this
myUser^ user1 = gcnew user1 (1002); outside the function , it gives an error syntax error missing ';' before '^'
myUser.h
#pragma once
ref class myUser
{
public:
myUser(unsigned int user_id) :id(user_id) {
...
}
private:
unsigned int id{ 0 };
public:
System::Void increment_UserID() {
id = id + 1;
}
};
MyForm.cpp
namespace FACEDControllerGUI {
System::Void MyForm::MyForm_Load(System::Object^ sender, System::EventArgs^ e) {
myUser^ user1 = gcnew user1 (1002);
myUser^ user2 = gcnew user1 (1005);
}
System::Void MyForm::btn_User1_Click(System::Object^ sender, System::EventArgs^ e) {
user1->increment_UserID();
}
System::Void MyForm::btn_User2_Click(System::Object^ sender, System::EventArgs^ e) {
user2->increment_UserID();
}
}
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You are creating user1 and user2 inside the MyForm_Load method, so as soon as that method ends the two variables disappear. You should create them in the class definition of MyForm so they are available to all methods of the class.
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I have mentioned this following:
At the same time, if I tried to declare this
myUser^ user1 = gcnew user1 (1002); outside the function , it gives an error syntax error missing ';' before '^'
Fortunately, I have solved my problem. It is due to #include function of the class is placed in the .cpp file, instead of the .h file
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1. What is friend function and friend class? Class "stu-info" stores all the details related to students like (name, reg, section , marks of 5 subjects). Class "show_details" will act like a friend of class "stu-info" and perform following operations: basic_details() and result(). These functions will work on the private data members of "stu-info".
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Is that a question or a statement?
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I use the print driver pdf995. I go to File/Print and I can print
to PDF.
Is there any way to programmatically check to see if the print queue
for this 'printer' is empty? If its empty, all is well and my software
works fine. But if something is stuck in that print queue, it really
causes chaos. When you go to File/Print, there must be some way of checking
the status of the print queue.
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Dear Community!
Concerning a topic that deals with the compilation of a program written in C++ i would like to ask for your support.
Just for information at the beginning: I am a beginner in C++ programming. Most of the things I do in Python, Java and PHP.
However, for writing the master thesis, I have to deal with an open source software where the relevant part is written in C++ where i have to modify one part and now have to compile the folder where the source files are located to a shared library (.so)
The source code is from https://github.com/qgis/QGIS
The file i modified was https://github.com/qgis/QGIS/blob/master/src/analysis/raster/qgskde.cpp
(In the installed version of QGIS, the folder analysis appears just as _analysis.so)
I am working on a MacBook using MacOS 10.15.4 and a Raspberry Pi using Raspbian and have CMake Version 3.4 installed.
The CMakeLists.txt File i try to compile using the command "cmake . --debug-output" (having directed to the directory "..../QGIS-master/src/analysis/" before) is
https://github.com/qgis/QGIS/blob/master/src/analysis/CMakeLists.txt
where i added
cmake_minimum_required(VERSION 3.4.0)
in Line 4.
The output i get when executing the command described above is:
Running with debug output on.
CMake Error at CMakeLists.txt:390 (find_package):
By not providing "FindEXIV2.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "EXIV2", but
CMake did not find one.
Could not find a package configuration file provided by "EXIV2" with any of
the following names:
EXIV2Config.cmake
exiv2-config.cmake
Add the installation prefix of "EXIV2" to CMAKE_PREFIX_PATH or set
"EXIV2_DIR" to a directory containing one of the above files. If "EXIV2"
provides a separate development package or SDK, be sure it has been
installed.
Called from: [1] /home/pi/QGIS-master/src/analysis/CMakeLists.txt
-- Configuring incomplete, errors occurred!
See also "/home/pi/QGIS-master/src/analysis/CMakeFiles/CMakeOutput.log".
After several attempts of trying to solve this problem using google i don't get any further. I attached the
CMakeOutput.log below.
Can someone give my advice on how i proceed here?
Thanks for any help in advance.
Best regards!
CMakeOutput.log
----------------------------------------------
The system is: Linux - 4.1.19+ - armv6l
Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded.
Compiler: /usr/bin/cc
Build flags:
Id flags:
The output was:
0
Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out"
The C compiler identification is GNU, found in "/home/pi/QGIS-master/src/analysis/CMakeFiles/3.4.0/CompilerIdC/a.out"
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" succeeded.
Compiler: /usr/bin/c++
Build flags:
Id flags:
The output was:
0
Compilation of the CXX compiler identification source "CMakeCXXCompilerId.cpp" produced "a.out"
The CXX compiler identification is GNU, found in "/home/pi/QGIS-master/src/analysis/CMakeFiles/3.4.0/CompilerIdCXX/a.out"
Determining if the C compiler works passed with the following output:
Change Dir: /home/pi/QGIS-master/src/analysis/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make" "cmTC_4142a/fast"
/usr/bin/make -f CMakeFiles/cmTC_4142a.dir/build.make CMakeFiles/cmTC_4142a.dir/build
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Detecting C compiler ABI info compiled with the following output:
Change Dir: /home/pi/QGIS-master/src/analysis/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make" "cmTC_56dec/fast"
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gcc version 4.6.3 (Debian 4.6.3-14+rpi1)
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Feature record: CXX_FEATURE:1cxx_sizeof_member
Feature record: CXX_FEATURE:1cxx_static_assert
Feature record: CXX_FEATURE:1cxx_strong_enums
Feature record: CXX_FEATURE:1cxx_template_template_parameters
Feature record: CXX_FEATURE:0cxx_thread_local
Feature record: CXX_FEATURE:1cxx_trailing_return_types
Feature record: CXX_FEATURE:1cxx_unicode_literals
Feature record: CXX_FEATURE:1cxx_uniform_initialization
Feature record: CXX_FEATURE:1cxx_unrestricted_unions
Feature record: CXX_FEATURE:0cxx_user_literals
Feature record: CXX_FEATURE:0cxx_variable_templates
Feature record: CXX_FEATURE:1cxx_variadic_macros
Feature record: CXX_FEATURE:1cxx_variadic_templates
Detecting CXX [-std=c++98] compiler features compiled with the following output:
Change Dir: /home/pi/QGIS-master/src/analysis/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make" "cmTC_7243f/fast"
/usr/bin/make -f CMakeFiles/cmTC_7243f.dir/build.make CMakeFiles/cmTC_7243f.dir/build
make[1]: Entering directory '/home/pi/QGIS-master/src/analysis/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_7243f.dir/feature_tests.cxx.o
/usr/bin/c++ -std=c++98 -o CMakeFiles/cmTC_7243f.dir/feature_tests.cxx.o -c /home/pi/QGIS-master/src/analysis/CMakeFiles/feature_tests.cxx
Linking CXX executable cmTC_7243f
/usr/local/bin/cmake -E cmake_link_script CMakeFiles/cmTC_7243f.dir/link.txt --verbose=1
/usr/bin/c++ CMakeFiles/cmTC_7243f.dir/feature_tests.cxx.o -o cmTC_7243f -rdynamic
make[1]: Leaving directory '/home/pi/QGIS-master/src/analysis/CMakeFiles/CMakeTmp'
Feature record: CXX_FEATURE:0cxx_aggregate_default_initializers
Feature record: CXX_FEATURE:0cxx_alias_templates
Feature record: CXX_FEATURE:0cxx_alignas
Feature record: CXX_FEATURE:0cxx_alignof
Feature record: CXX_FEATURE:0cxx_attributes
Feature record: CXX_FEATURE:0cxx_attribute_deprecated
Feature record: CXX_FEATURE:0cxx_auto_type
Feature record: CXX_FEATURE:0cxx_binary_literals
Feature record: CXX_FEATURE:0cxx_constexpr
Feature record: CXX_FEATURE:0cxx_contextual_conversions
Feature record: CXX_FEATURE:0cxx_decltype
Feature record: CXX_FEATURE:0cxx_decltype_auto
Feature record: CXX_FEATURE:0cxx_decltype_incomplete_return_types
Feature record: CXX_FEATURE:0cxx_default_function_template_args
Feature record: CXX_FEATURE:0cxx_defaulted_functions
Feature record: CXX_FEATURE:0cxx_defaulted_move_initializers
Feature record: CXX_FEATURE:0cxx_delegating_constructors
Feature record: CXX_FEATURE:0cxx_deleted_functions
Feature record: CXX_FEATURE:0cxx_digit_separators
Feature record: CXX_FEATURE:0cxx_enum_forward_declarations
Feature record: CXX_FEATURE:0cxx_explicit_conversions
Feature record: CXX_FEATURE:0cxx_extended_friend_declarations
Feature record: CXX_FEATURE:0cxx_extern_templates
Feature record: CXX_FEATURE:0cxx_final
Feature record: CXX_FEATURE:0cxx_func_identifier
Feature record: CXX_FEATURE:0cxx_generalized_initializers
Feature record: CXX_FEATURE:0cxx_generic_lambdas
Feature record: CXX_FEATURE:0cxx_inheriting_constructors
Feature record: CXX_FEATURE:0cxx_inline_namespaces
Feature record: CXX_FEATURE:0cxx_lambdas
Feature record: CXX_FEATURE:0cxx_lambda_init_captures
Feature record: CXX_FEATURE:0cxx_local_type_template_args
Feature record: CXX_FEATURE:0cxx_long_long_type
Feature record: CXX_FEATURE:0cxx_noexcept
Feature record: CXX_FEATURE:0cxx_nonstatic_member_init
Feature record: CXX_FEATURE:0cxx_nullptr
Feature record: CXX_FEATURE:0cxx_override
Feature record: CXX_FEATURE:0cxx_range_for
Feature record: CXX_FEATURE:0cxx_raw_string_literals
Feature record: CXX_FEATURE:0cxx_reference_qualified_functions
Feature record: CXX_FEATURE:0cxx_relaxed_constexpr
Feature record: CXX_FEATURE:0cxx_return_type_deduction
Feature record: CXX_FEATURE:0cxx_right_angle_brackets
Feature record: CXX_FEATURE:0cxx_rvalue_references
Feature record: CXX_FEATURE:0cxx_sizeof_member
Feature record: CXX_FEATURE:0cxx_static_assert
Feature record: CXX_FEATURE:0cxx_strong_enums
Feature record: CXX_FEATURE:1cxx_template_template_parameters
Feature record: CXX_FEATURE:0cxx_thread_local
Feature record: CXX_FEATURE:0cxx_trailing_return_types
Feature record: CXX_FEATURE:0cxx_unicode_literals
Feature record: CXX_FEATURE:0cxx_uniform_initialization
Feature record: CXX_FEATURE:0cxx_unrestricted_unions
Feature record: CXX_FEATURE:0cxx_user_literals
Feature record: CXX_FEATURE:0cxx_variable_templates
Feature record: CXX_FEATURE:0cxx_variadic_macros
Feature record: CXX_FEATURE:0cxx_variadic_templates
----------------------------------------------
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Did you compile it "before" you started making changes? That way, you know that it worked in the first place. If not, start over.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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No unfortunately not. But I have downloaded the same sourcecode (means kind of "virgin") from github where i didn't implement my changes (which are should not have any impact as it is just a change of a formula in one calculation) and the exact error occurs also.
However, I've worked myself through somehow to get around this exiv2 problem by inserting
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_MODULE_PATH}/home/pi/QGIS-master/src/analysis/")
to the CMakeLists.txt file.
However, i'm stuck at this line now:
Running with debug output on.
-- Found exiv2: /usr/lib/arm-linux-gnueabihf/libexiv2.so
Called from: [2] /home/pi/QGIS-master/src/analysis/FindEXIV2.cmake
[1] /home/pi/QGIS-master/src/analysis/CMakeLists.txt
CMake Error at CMakeLists.txt:400 (ADD_FLEX_FILES_PREFIX):
Unknown CMake command "ADD_FLEX_FILES_PREFIX".
Called from: [1] /home/pi/QGIS-master/src/analysis/CMakeLists.txt
-- Configuring incomplete, errors occurred!
See also "/home/pi/QGIS-master/src/analysis/CMakeFiles/CMakeOutput.log".
and except finding google solutions that redirect me to the same file or similar ones of the QGIS github project i cant find where it fails now.
Do you have an idea?
Thanks for your time in advance!
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