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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
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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:
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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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Then check the history of this project. Maybe it never worked (recently).
Anyway, take out some useful part and see if you can compile that. Never met software where I couldn't find something to remove / refactor (or totally rewrite). If you don't understand it, you probably don't need it.
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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Has anyone tackled moving a project using C++/CLI to target .NET 5?
After struggling with the project settings, I am very close as everything compiles and resolves references now. But, I'm stuck with a useless link error. Adding /VERBOSE and /VERBOSE:CLR don't add any more info.
Just wondering if it's supported or not..
FWIW, here's the link error. There is usually a message after the "(80131195) :"
12>MSVCMRTD_netcore.LIB(mstartup.obj) : error LNK2022: metadata operation failed (80131195) :
12>LINK : fatal error LNK1255: link failed because of metadata errors
12>Done building project "JmpCLR.vcxproj" -- FAILED.
John
modified 5-Jan-21 10:22am.
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I'm interested in this question. Did you find an answer?
The difficult we do right away...
...the impossible takes slightly longer.
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Unfortunately not. The best (only) write-up I've found specifically dealing with targeting .NET 5 from C++/CLI code is this one from "Mike" at Microsoft.
Porting a C++/CLI Project to .NET Core
That allowed me to get past some of the early build issues I encountered. But, I still have no way of diagnosing the remaining linker error. I am looking at other changes right now but will return to this sometime soon. I may have to resort to using one of my MSDN Premier tickets on the issues.
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We've run into the same linker problem, porting an application to .net5. Did you ever get a resolution to this issue?
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Hi Doug, No. I've tried various things and each attempt ends up with this inscrutable linker error. I have not opened a MSDN premier support ticket yet due to other work deadlines but I plan to when I can focus on this again. I tried to get help on twitter but all point me to opening a devcommunity ticket + prayer. I will add a reply here if I manage to get further. Please let me know if you find a way to diagnose the issue as well. I plan to try VS 2022 preview 3 which dropped yesterday as well though confidence is not high that they touched the C++/CLI compiler/linker at all since 2017.
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Hi John,
We've narrowed down the problem to the use of gcroot<string^> as a parameter method in an unmanaged class. Using gcroot<exception^> seems to be okay.
See below for a contrived example. Given the nature of the error, it may not be related your problem.
// fails when cpp is compiled with /clr:dotnetcore
// succeeds when cpp is compiled with /clr
#pragma once
#include <vcclr.h>
class UnmanagedClassWithGcHandle
{
public:
int age;
// error LNK2022 : metadata operation failed(80131195) : ( ONLY TARGETING .NET 5.0 )
void foobar(gcroot<system::string^>);
// this is successful
void foobar2(gcroot<system::exception^>);
};
void UnmanagedClassWithGcHandle::foobar(gcroot<system::string^>)
{
}
void UnmanagedClassWithGcHandle::foobar2(gcroot<system::exception^>)
{
}
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We submitted an ticket with Microsoft and they have acknowledged this as a bug. I will update with any additional information.
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If you are also Doug Milne 2021, then you should close one of these accounts.
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