Develop Reference

Problem with Implementation of QWidget in WPF

I have created a Qt/C++ .dll for use in a C#/WPF project.
The Qt section code is as below:
cpluspart_global.h:
#ifndef CPLUSPART_GLOBAL_H
#define CPLUSPART_GLOBAL_H
#include <QtCore/qglobal.h>
#if defined(CPLUSPART_LIBRARY)
# define CPLUSPARTSHARED_EXPORT Q_DECL_EXPORT
#else
# define CPLUSPARTSHARED_EXPORT Q_DECL_IMPORT
#endif
extern "C" __declspec(dllexport) void ShowSampleUI();
extern "C" __declspec(dllexport) int Sum(int a, int b);
#endif // CPLUSPART_GLOBAL_H
cpluspart.cpp:
#include "cpluspart.h"
CPlusPart::CPlusPart()
{
}
extern "C" void ShowSampleUI()
{
BenQ *sampleUI = new BenQ();
sampleUI->show();
}
extern "C" int Sum(int a, int b)
{
return a + b;
}
BenQ is an empty QDialog that is just used for tests.
Here is the implementation in C#:
[DllImport("CPlusPart.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void ShowSampleUI();
[DllImport("CPlusPart.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int Sum(int a, int b);
The "Sum" method works properly. However, when I want to call "ShowSampleUI", I receive the following error:
Unhandled exception at 0x00007FFCD125286E (ucrtbase.dll) in CPlusInWPF.exe: Fatal program exit requested.
I would appreciate it if you could kindly help me with this issue.

c# callback from C DLL with char *

I'm making messaging system with C library.
To send messages from C library (DLL), I made this DLL file and tried to callback from C to C#
here is C DLL Code
logging.h
#pragma once
#include <stdio.h>
struct loggingMessage {
void (*fp)(char *, int, int);
};
struct loggingMessage messageConfig;
__declspec(dllexport) void loggingInitialize();
__declspec(dllexport) void print();
__declspec(dllexport) void setEventCallBack(void(*fp)(char *, int, int));
logging.c
void loggingInitialize()
{
messageConfig.fp = NULL;
}
void print(char *str, int length)
{
char buf[1024];
memset(buf, 0, sizeof(char) * 1024);
sprintf(buf, "%s", str);
if (messageConfig.fp != NULL)
{
messageConfig.fp(buf, length, 0);
}
}
void setEventCallBack(void (*fp)(char *buf, int length, int debugLevel))
{
messageConfig.fp = fp;
char str[512] = "stringTmp";
fp(str, 1, 0);
fp(str, 1, 1);
fp(str, 1, 2);
fp(str, 1, 3);
}
Program.cs in C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
delegate void EventCallback(string _input, int length, int level);
namespace console
{
class Program
{
[DllImport("logging.dll", CallingConvention = CallingConvention.StdCall)]
public static extern void print();
[DllImport("logging.dll")]
public static extern void setEventCallBack(EventCallback fp);
[DllImport("logging.dll")]
public static extern void loggingInitialize();
public static void update(string _input, int length, int level)
{
Console.WriteLine("Message : {0} Length {1} Level {2}", _input, length , level);
}
static void Main(string[] args)
{
loggingInitialize();
setEventCallBack(update);
}
}
}
And in console I could see the message, but there was a error about function pointer.
I didn't understand what error was and I wonder how to debug and how to set parameters, pointers between C# and C.

You have declared your DllImport statements as CallingConvention = CallingConvention.StdCall however in your C code you declared them as __declspec, you need to use CallingConvention = CallingConvention.Cdecl instead on all of the imports (the default if you don't specify is CallingConvention.Winapi which maps to StdCall on most platforms).

Modifying value of structure passed to DLL from C#

I am trying to do 2 things: get a return value from a C dll function, and have that same function modify 1 of the members of a structure that is passed to it. After much experimentation I was able to get the function to return a value, but I am still unable to get it to return a modified value to the C# code; the value remains (unmodified) as 0.
I've tried lots of variations (ref, [In,Out], etc) to no avail
using System;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
namespace Vexing.Problem{
public class myIdx : VexingObject {
public myIdx(object _ctx) : base(_ctx) { }
private IPlotObject plot1;
[StructLayout(LayoutKind.Sequential)]
public class PLEX { public int yowser; }
[DllImport("my.dll", CharSet = CharSet.Unicode)]
public static extern int cFunction(
[MarshalAs(UnmanagedType.LPStruct)] PLEX mPlex);
PLEX a;
protected override void Create() { a = new PLEX(); }
protected override void CalcBar() {
int mf = cFunction(a);
plot1.Set(a.yowser); }
}}
// pertinent c dll code
typedef struct s_plex { int yowser;} cplex;
extern "C" __declspec( dllexport )
int cFunction(cplex *Cplex){ Cplex->yowser = 44; return 1;}

Your import declaration is wrong.
Setting the CharSet in your case doesn't make any sense (there are no string parameters in the native function declaration).
If you want to pass class instance, ref/out also must be thrown away (classes being passed by reference).
And the main point: extern "C" __declspec( dllexport ) means CallingConvention.Cdecl.
UPDATE. Here's complete working code sample:
C++ (header):
struct CStruct
{
int myField;
};
extern "C" __declspec( dllexport ) int MyFunction(CStruct *pStruct);
C++ (code):
int MyFunction(CStruct *pStruct)
{
pStruct->myField = 100;
return 1;
}
C#:
[StructLayout(LayoutKind.Sequential)]
class MyStruct
{
public int myField;
};
class Program
{
MyStruct myStruct = new MyStruct();
[DllImport("MyLib.dll", CallingConvention = CallingConvention.Cdecl)]
static extern int MyFunction(MyStruct pStruct);
static void Main(string[] args)
{
var p = new Program();
var result = MyFunction(p.myStruct);
Console.WriteLine("Result: {0}, MyStruct.myField = {1}", result, p.myStruct.myField);
}
}
Prints:
Result: 1, MyStruct.myField = 100

How to create dll in C++ for using in C#

I've a little question to ask you.
I have one C++ source and one header files. The C++ file uses windows.h library, makes operations using serial port(basic operations: read(), write() etc.).
What I want to do is, creating a library using these files, and use that library in my C#.Net solution.
What type of library I need to create?
How can I do it?
After creating library, How can I import it to C# solution?
My best regards.
Code Parts I'm using:
// MathFuncsDll.h
namespace MathFuncs
{
class MyMathFuncs
{
public:
// Returns a + b
static __declspec(dllexport) double Add(double a, double b);
// Returns a - b
static __declspec(dllexport) double Subtract(double a, double b);
// Returns a * b
static __declspec(dllexport) double Multiply(double a, double b);
// Returns a / b
// Throws DivideByZeroException if b is 0
static __declspec(dllexport) double Divide(double a, double b);
};
}
// MathFuncsDll.cpp
// compile with: /EHsc /LD
#include "MathFuncsDll.h"
#include <stdexcept>
using namespace std;
namespace MathFuncs
{
double MyMathFuncs::Add(double a, double b)
{
return a + b;
}
double MyMathFuncs::Subtract(double a, double b)
{
return a - b;
}
double MyMathFuncs::Multiply(double a, double b)
{
return a * b;
}
double MyMathFuncs::Divide(double a, double b)
{
if (b == 0)
{
throw new invalid_argument("b cannot be zero!");
}
return a / b;
}
}
C# import part:
[DllImport("SimpleDll.dll", CallingConvention=CallingConvention.Cdecl)]
public static extern double Add(double a, double b);
static void Main(string[] args)
{
string a = Add(1.0, 3.0));
}

After several comments, here a try:
C++ Code (DLL), eg. math.cpp, compiled to HighSpeedMath.dll:
extern "C"
{
__declspec(dllexport) int __stdcall math_add(int a, int b)
{
return a + b;
}
}
C# Code, eg. Program.cs:
namespace HighSpeedMathTest
{
using System.Runtime.InteropServices;
class Program
{
[DllImport("HighSpeedMath.dll", EntryPoint="math_add", CallingConvention=CallingConvention.StdCall)]
static extern int Add(int a, int b);
static void Main(string[] args)
{
int result = Add(27, 28);
}
}
}
Of course, if the entry point matches already you don't have to specify it. The same with the calling convention.
As mentioned in the comments, the DLL has to provide a C-interface. That means, extern "C", no exceptions, no references etc.
Edit:
If you have a header and a source file for your DLL, it could look like this:
math.hpp
#ifndef MATH_HPP
#define MATH_HPP
extern "C"
{
__declspec(dllexport) int __stdcall math_add(int a, int b);
}
#endif
math.cpp
#include "math.hpp"
int __stdcall math_add(int a, int b)
{
return a + b;
}

You need to compile your C++ code into a dynamic link library and do the following in C#:
class MyClass
{
[DllImport("MyDLL.dll")]
public static extern void MyFunctionFromDll();
static void Main()
{
MyFunctionFromDll();
}
}

You may use C# DllImport and Dllexport for DLL Interop walkthrough as a starting point. And here is the Platform Invoke Tutorial
Hope this helps.

In addition to Lichian's offer to compile to a regular DLL and use p/invoke which is probably the simplest way
You can also create your C++ as a COM component (probably something you don't want to do) and the 3rd option you have is to add a thin layer of C++/CLI
e.g.
using namespace System;
namespace youcomany{ namespace CPPWrapper
{
Wrapper::Function(String^ parameter)
{
//call the rest of you C++ from here
}
}}

Enry point not found while call C++ dll from C# application

I have simple C++ dll function:
__declspec(dllexport) int tst1(int a);
int tst1(int a)
{
return a + 1;
}
I have C# application that calls it:
[DllImport("Project1.dll")]
public static extern int tst1(int i);
static void Main(string[] args)
{
Console.WriteLine( tst1(1) );
Console.ReadLine();
}
}
Got EntryPointNotFoundException error:
What I do wrong?

The name is getting mangled by C++ decoration. Add extern "C" to prevent the mangling of the name:
extern "C" __declspec(dllexport) int tst1(int a);