I have created .dll file in Visual C++.
It includes a function which takes two arguments and send data through serial port. Next i wanted to include this .dll in my application and call these functions. But i am unable to call these functions. Kindly Help.
Here is header file for my .dll
namespace positioncontrol
{
using namespace std;
using namespace System;
using namespace System::IO::Ports;
public ref class control
{
static int rotate(char a, String^ b);
};
}
And here is .cpp for my .dll
#include "goniometer.h"
namespace positioncontrol
{
void control::rotate(char a, String^ b)
{ SerialPort^ serialPort = gcnew SerialPort(L"COM5",9600,Parity::None,1,StopBits::One);
int inp_rotation;
array<unsigned char>^ inp_c = gcnew array<unsigned char>(2);
String^ inp_string;
inp_c[0] = a;
inp_string= b;
inp_rotation=Int32::Parse(inp_string);
inp_c[1] = (unsigned char)inp_rotation;
serialPort->Write(inp_c,0,2);
}
}
I am using this .dll in a desktop application. I have include the header file
#ifndef goniometer_h
#define goniometer_h
#include "goniometer.h"
#endif
Added the path for include directories and added .dll as a reference.
Now i am using the function defined in .dll for a click event
private: System::Void button9_Click(System::Object^ sender, System::EventArgs^ e) {
char dir;
dir = 0x42;
String^ inp_string;
inp_string=enter_degree->Text;
positioncontrol::control::rotate(dir,inp_string);
}
Now when i build my desktop application i am getting following error
1>C:\Users\DELL\Desktop\Final\Motor_Dual_API\Debug\goniometer.h(10): error C2011: 'positioncontrol::control' : 'class' type redefinition
1> c:\users\dell\desktop\final\vc++dll\debug\goniometer.dll : see declaration of 'positioncontrol::control'
1>c:\users\dell\desktop\final\motor_dual_api\motor_next\Form1.h(530): error C2027: use of undefined type 'positioncontrol::control'
1> c:\users\dell\desktop\final\vc++dll\debug\goniometer.dll : see declaration of 'positioncontrol::control'
1>c:\users\dell\desktop\final\motor_dual_api\motor_next\Form1.h(530): error C3861: 'rotate': identifier not found
1>c:\users\dell\desktop\final\motor_dual_api\motor_next\Form1.h(540): error C2027: use of undefined type 'positioncontrol::control'
1> c:\users\dell\desktop\final\vc++dll\debug\goniometer.dll : see declaration of 'positioncontrol::control'
1>c:\users\dell\desktop\final\motor_dual_api\motor_next\Form1.h(540): error C3861: 'rotate': identifier not found
Kindly help me in figuring out error.
Thanks and Regards
In C++, the namespace separator is :: rather than .. Check your using statement.
Your code does not define serialPort. Add the definition to the global namespace, to the namespace positionControl or as an auto variable in your function
From the semantic point of view, serialPort is a pointer. So must also create an instance of the object, where serialPort points to.
Related
I would like to wrap a complex c++ class which used opencv object with c++/cli for using in c# and vb. I'm using Visual Studio 2015. I'm using the x64 versions of of the OpenCV library and compiling also to x64.
Following is the header.h file of a small test class, just as an example:
#pragma once
#include <vector>
#include "opencv2/opencv.hpp"
using namespace std;
class compC
{
public:
compC(int * pInt, int arrSize);
int sumArray();
private:
vector<int> vec;
cv::Mat img;
};
This is going to be compiled as a win32-application to a .lib file without any problems.
The example wrapper class (wrapper.h) would look like:
#pragma once
#include "../ConsoleApplication1/header.h"
#include "../ConsoleApplication1/body.cpp"
using namespace System;
namespace WrapperLibrary {
public ref class WrapperClass
{
public:
WrapperClass(int * pInt, int arraySize);
int getSum();
private:
compC * pcC;
int sum;
};
}
The second class would be compiled as a dll with /clr (as c++/cli project).
First I got an error that opencv.hpp could not be find and had to add the include directory of opencv in to the wrapper project. But I cannot compile it and get a lot of errors, mainly pointing to linking problems "unresolved external problems ..." in connection with the opencv-mat object.
If I remove the lines
#include "opencv2/opencv.hpp"
and
cv::Mat img;
in the test class (header.h) all will be fine.
What did I made wrong? How can I wrap those c++ class with c++/cli?
When creating a new class while working in a project that is based around windows application forms. I have a problem where string becomes unusable. I get errors the say things like
"a member of a managed class cannot be of a non-managed class type"
"IntelliSense: a function type involving a generic parameter cannot have an ellipsis parameter"
"IntelliSense: linkage specification is incompatible with previous "bsearch_s"(declared at line 426)"
Person.h
#pragma once
#include <string>
using namespace std;
ref class Person
{
public:
Person(void);
string name;
};
Person.cpp
#include "stdafx.h"
#include "Person.h"
#include <string>
using namespace std;
Person::Person(void)
{
name = "Bob";
}
If someone has a solution to this or a work around that isn't creating my own string class I would love to hear it as this has been bothering me for days.
String header in CLI C++ is already included in the System namespace.
String works as a pointer. Using the cap ^ handler
//This works:
#include "stdafx.h"
using namespace System;
void function()
{
String^ simpleStr = "Bob";
}
I want to use the Concurrency library of Visual Studio 2010 to pass actions between threads.
I have my class SimpleAction and pointers to it are stored in the Concurrency::concurrent_queue.
Using this definition, and 'consumption' logic it works:
typedef Concurrency::concurrent_queue<SimpleAction *> ActionQueue;
while (true)
{
SimpleAction *action = nullptr;
while (m_queue.try_pop(action))
{
action->process();
delete action;
}
Sleep(100);
}
However, when I change this to an std::unique_ptr, like this:
typedef Concurrency::concurrent_queue<std::unique_ptr<SimpleAction>> ActionQueue;
while (true)
{
std::unique_ptr<SimpleAction> action;
while (m_queue.try_pop(action))
{
action->process();
}
Sleep(100);
}
The compiler gives the following error message:
F:\DevStudio\Vs2010\VC\INCLUDE\concurrent_queue.h(366) : error C2248: 'std::unique_ptr<_Ty>::unique_ptr' : cannot access private member declared in class 'std::unique_ptr<_Ty>'
with
[
_Ty=`anonymous-namespace'::SimpleAction
]
F:\DevStudio\Vs2010\VC\INCLUDE\memory(2347) : see declaration of 'std::unique_ptr<_Ty>::unique_ptr'
with
[
_Ty=`anonymous-namespace'::SimpleAction
]
F:\DevStudio\Vs2010\VC\INCLUDE\concurrent_queue.h(365) : while compiling class template member function 'void Concurrency::concurrent_queue<_Ty>::_Copy_item(Concurrency::details::_Concurrent_queue_base_v4::_Page &,size_t,const void *)'
with
[
_Ty=std::unique_ptr<`anonymous-namespace'::SimpleAction>
]
test.cpp(138) : see reference to class template instantiation 'Concurrency::concurrent_queue<_Ty>' being compiled
with
[
_Ty=std::unique_ptr<`anonymous-namespace'::SimpleAction>
]
It seems the compiler does not like this construction in concurrent_queue:
/*override*/ virtual void _Copy_item( _Page& _Dst, size_t _Index, const void* _Src )
{
new( &_Get_ref(_Dst,_Index) ) _Ty(*static_cast<const _Ty*>(_Src));
}
Which seems logical (we don't want an std::unique_ptr to be copied (it must be moved instead).
Questions:
Is this a known problem/limitation/feature of the Concurrency/PPL library of Visual Studio 2010?
Is this problem solved in Visual Studio 2012?
Or am I doing something wrong?
thanks,
Patrick
EDIT: What is C++/CLI? I am programming in Visual studio, and as far as I know using C++... Also, The first error was solved by Peter's comment, but I am still stuck on the second.
I am brand new to the world of C++, and have previously done all my work in Java. I am unfamiliar with the use of pointers and garbage collection (though I believe I understand the concept) and I believe that may be the source of my problems. I am getting the following error messages:
1>Runner.cpp(6): error C3145: 'formOutOfTime' : global or static variable may not have managed type 'System::Windows::Forms::Form ^'
1> may not declare a global or static variable, or a member of a native type that refers to objects in the gc heap
1>Runner.cpp(22): error C2061: syntax error : identifier 'FormOutOfTime'
My code is like this:
PurpleHealth.cpp (This is the file I believe the system calls to start it all off):
#include "FormOutOfTime.h"
#include "FormParentalOverride.h"
#include "Runner.h"
using namespace PurpleHealth;
[STAThreadAttribute]
int main(array<System::String ^> ^args)
{
// Enabling Windows XP visual effects before any controls are created
Application::EnableVisualStyles();
Application::SetCompatibleTextRenderingDefault(false);
// Create the main window and run it
//Application::Run(gcnew FormOutOfTime());
Runner* runner = new Runner();
//delete runner;
return 0;
}
Runner.h (this is the header file I want to run all my main code, and launch the forms. I also struggle with the purpose behind the header files)
#include "stdafx.h"
#include "FormOutOfTime.h"
#include "FormParentalOverride.h"
class Runner
{
public:
Runner();
~Runner();
// functions
private:
void Go();
// member variables
};
And Finally Runner.cpp:
#include "stdafx.h"
#include "Runner.h"
#include "FormOutOfTime.h"
#include "FormParentalOverride.h"
//Variable Dclaration
System::Windows::Forms::Form^ formOutOfTime;//Error Here***************************
Runner::Runner()
{
// Do stuff if you need to
this->Go();
}
Runner::~Runner()
{
// Clear memory if you need to
}
void Runner::Go()
{
formOutOfTime = gcnew FormOutOfTime();//Error Here***************************
formOutOfTime->ShowDialog();
}
Please help me solve these messages, and even critique on form is appreciated. Thanks.
managed pointers cannot be declared at static or global scope. They can only be declared at function scope. Move the declaration of formOutOfTime from the top of the runner.cpp file to within the Go method
This is the error message I'm getting:
error C2248:
'std::basic_ios<_Elem,_Traits>::basic_ios'
: cannot access private member
declared in class
'std::basic_ios<_Elem,_Traits>' C:\Program
Files\Microsoft Visual Studio
10.0\VC\include\fstream
this is the line it says the error is
template<class _Elem,
class _Traits> inline
void swap(basic_ofstream<_Elem, _Traits>& _Left,
basic_ofstream<_Elem, _Traits>& _Right)
{ // swap _Left and _Right basic_ofstreams
_Left.swap(_Right);
}
this is the code where I access fstream
char* stringPointer = (char*) Marshal::StringToHGlobalAnsi(saveFileNameString).ToPointer();
ofstream sessionFile;
sessionFile.open(stringPointer, std::ios_base::in);
Marshal::FreeHGlobal(IntPtr(stringPointer));`
Thank you in advance!!!!
The problem is not on Fstream.h but on your code.
Check if your not passing a private member variable of a class to ofstream or some other method.
I just run into that problem, and thanks to Luron's comment I figured it out.
I post the explanation in case someone would have the same problem:
There is no copy constructor for stream objects (ostream, istream and derivates), and passing one of these objects to a function will call the copy constructor and so will cause the error.