DLL with WinApi

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I want make GUI for adjustment when im start script.

I make simple DLL which have to show window.

It works when I used this dll in c++ (dev), but when I run this dll from mql i get error in:

RegisterClassEx()


I use c++ and WinApi.


Do anybody know why?

 
crn:

I want make GUI for adjustment when im start script.

I make simple DLL which have to show window.

It works when I used this dll in c++ (dev), but when I run this dll from mql i get error in:

RegisterClassEx()


I use c++ and WinApi.


Do anybody know why?

1) which folder did you put DLL?

2) How did you attempt to "run" the DLL from MQL?

3) c++ dev (are you saying, ide?). If so, that is more than a compiler, whereas MetaEditor is not. It only compiles .mq4 mqh, mqt, etc.

 
diostar:

1) which folder did you put DLL?

2) How did you attempt to "run" the DLL from MQL?

3) c++ dev (are you saying, ide?). If so, that is more than a compiler, whereas MetaEditor is not. It only compiles .mq4 mqh, mqt, etc.


1. libraries



2.

#import "test_ApiDLL.dll"


int okno();

#import
int start()
{

Print(okno());

return(0);

}


DLL:

[code]


/* Replace "dll.h" with the name of your header */
#include "dll.h"
#include <windows.h>

DllClass::DllClass()
{

}


DllClass::~DllClass ()
{

}

HINSTANCE x;
HWND hwnd;


double DLLIMPORT kwadrat( double liczba ){


return(liczba*liczba);
};



int APIENTRY DllMain (HINSTANCE hInst /* Library instance handle. */,
DWORD reason /* Reason this function is being called. */,
LPVOID reserved /* Not used. */ )
{



switch (reason)
{
case DLL_PROCESS_ATTACH:

x = hInst;
MessageBox( NULL, "TEXT", "main", MB_OK | MB_ICONWARNING | MB_DEFBUTTON2 | MB_OKCANCEL );

break;

case DLL_PROCESS_DETACH:
break;

case DLL_THREAD_ATTACH:


break;

case DLL_THREAD_DETACH:
break;
}

/* Returns TRUE on success, FALSE on failure */
return 1;
}

LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
switch( msg )
{
case WM_CLOSE:
DestroyWindow( hwnd );
break;

case WM_DESTROY:
PostQuitMessage( 0 );
break;

default:
return DefWindowProc( hwnd, msg, wParam, lParam );
}
}


int okno( )
{

//MessageBox( NULL, "TEXT", "main", MB_OK | MB_ICONWARNING | MB_DEFBUTTON2 | MB_OKCANCEL );


WNDCLASSEX wc;

HWND hWin = GetActiveWindow();
// HINSTANCE hInstance = GetWindowLong( hWin, GWL_HINSTANCE);

wc.cbSize = sizeof( WNDCLASSEX );
wc.style = 0;
wc.lpfnWndProc = WndProc; //obsluga komunikatow
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = x;
//(HINSTANCE)GetWindowLong( hWin, GWL_HINSTANCE);
wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
wc.hCursor = LoadCursor( NULL, IDC_ARROW );
wc.hbrBackground =( HBRUSH )( COLOR_WINDOW + 1 ); //kolor tla
wc.lpszMenuName = NULL;
wc.lpszClassName = "Nazwa_Klasy";
wc.hIconSm = LoadIcon( NULL, IDI_APPLICATION );
wc.style = CS_DBLCLKS;


if( !RegisterClassEx( & wc ) )
{

return 2;


}

// TWORZENIE OKNA

hwnd = CreateWindowEx( WS_EX_CLIENTEDGE, "Nazwa_Klasy", "Nazwa_Okna", WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 500, 500, NULL, NULL, x, NULL );

if( hwnd == NULL ) return 4;

ShowWindow( hwnd, 1 ); // Pokaż okienko...
UpdateWindow( hwnd );

}


//heder file from dll:


#ifndef _DLL_H_
#define _DLL_H_

#if BUILDING_DLL
# define DLLIMPORT __declspec (dllexport)
#else /* Not BUILDING_DLL */
# define DLLIMPORT __declspec (dllimport)
#endif /* Not BUILDING_DLL */

extern "C"
{
double DLLIMPORT kwadrat( double liczba );
}

extern "C"
{
int DLLIMPORT okno();
}

class DLLIMPORT DllClass
{
public:
DllClass();
virtual ~DllClass(void);

private:

};


#endif /* _DLL_H_ */


Any ideas ?

 

First, it can be difficult for anyone to read these codes, because they are not keyword-coloured, further, they are not of MQL syntax, and I forgot that the src does not support this.

The objects created and passed ard (the OOP structure part) can be another one. To cut the story short, this what I decided to do:


I search thru your codes (ctrl-F) for RegisterClassEx() and it returns me this instance. if( !RegisterClassEx( & wc ) )

somewhere in one of those, likely the one you imported and run. ---------------------------- (1)

Now, if (1) is true, then I can assume this is A FUNCTION but with passing parameters, some wc object, 1 instance of some class that is required. ---------------------------- (2)

Now, if (2) is true my question to you now is: where is this function in your test-API.DLL?


Deductive reasoning at this point, the error can be that you must have forgotten/left it out, totally together. Hope this helps.

 
I'm confusion. Could YOu cleary or make change in my conde then i analize it and I will be know where is error ?
 
crn:
I'm confusion. Could YOu cleary or make change in my conde then i analize it and I will be know where is error ?

Is it possible for you to add:

RegisterClassEx(){} function:

in the body of the above code?

 
diostar:

Is it possible for you to add:

RegisterClassEx(){} function:

in the body of the above code?



In qmlo or in header file of dlls?


But when I make separate funkction RegisterClassEx(){} like dll function how to use it together?

 
Avoid ALL header files, first. What is qmlo?
 
diostar:
Avoid ALL header files, first. What is qmlo?





qmlo - that must be a error in letter ;/ Sorry for that. That shoud be MQL ;/


Ok where I have to add: RegisterClassEx(){} function:?


Could You make example in code?

 
crn:

qmlo - that must be a error in letter ;/ Sorry for that. That shoud be MQL ;/


Ok where I have to add: RegisterClassEx(){} function:?


Could You make example in code?

This is a standard function of User32.DLL

Have you added that FIRST into your MQL library folder? Read this: http://msdn.microsoft.com/en-us/library/windows/desktop/ms633587%28v=vs.85%29.aspx

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