Create window form C++ function using MFC or Win32 API

[Pavel_47]

There are thousands of these examples all over the Internet. Or get a good book, such as the ones written by Charles Petzold.

Hello Paul. Thank you for response. If you show me just one, that correspond to my case I will be very grateful. FYI my case is:

• creation of a GUI inside of a DLL
• DLL is called by a particular CAD tool
• the CAD interface for DLL call isn't on my control

Regards

Pavel

[Pavel_47]

Thanks Ovidiu,

I programmed in C++ about 15 years ago, so some basic things are forgotten.
Finally I've found workaround. Here is code that works (in sense simple window is displayed).
Thanks to all participants !
Best Regards.
Pavel.

#include "stdafx.h"
#include "vpi_MFC_regular.h"
#include "vpi_user.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

// Cvpi_MFC_regularApp

BEGIN_MESSAGE_MAP(Cvpi_MFC_regularApp, CWinApp)
END_MESSAGE_MAP()

// Cvpi_MFC_regularApp construction

Cvpi_MFC_regularApp::Cvpi_MFC_regularApp()
{
	vpi_printf("Inside of Application Constructor\n");
}


// The one and only Cvpi_MFC_regularApp object

Cvpi_MFC_regularApp theApp;

class CMyWindow : public CFrameWnd
{
	CStatic* cs;
public:
	CMyWindow();
};

CMyWindow::CMyWindow()
{
	Create(NULL, L"MyWindow", WS_VISIBLE, CRect(0,0,200,200));
	cs = new CStatic();
	cs->Create(L"AAAAAAAAAAAAAA", WS_CHILD|WS_VISIBLE|SS_CENTER, CRect(50, 80, 150, 150), this);
	vpi_printf("Inside of Window Constructor\n");
}

// Cvpi_MFC_regularApp initialization
BOOL Cvpi_MFC_regularApp::InitInstance()
{
	vpi_printf("Inside of Application InitInstance\n");
	CWinApp::InitInstance();
	m_pMainWnd = new CMyWindow();
	m_pMainWnd->ShowWindow(SW_SHOW);
	m_pMainWnd->UpdateWindow();
	return TRUE;
}

PLI_INT32 vpi_CreateWindow(PLI_BYTE8 *user_data)
{
	vpi_printf("Inside of vpi_CreateWindow\n");
	return 0;
}

[Paul McKenzie]

Hello Paul. Thank you for response. If you show me just one, that correspond to my case I will be very grateful. FYI my case is:

• creation of a GUI inside of a DLL
• DLL is called by a particular CAD tool
• the CAD interface for DLL call isn't on my control

Can you create a GUI, regardless of whether it is in a DLL or not? You are trying to run a marathon, but have not learned how to walk.

Windows programming cannot be picked up by cobbling code together, and programming experience in whatever language doesn't automatically guarantee you can write a Windows program. You could be a C++ programmer for many years, if you haven't done event-driven programming, it is going to be brand new to you, and that takes time to learn. To learn Windows programming properly requires knowing and running working examples, regardless of what your final goal is.

If you can't do the basics, how are you going to accomplish anything from there? You create the GUI and you display the window and wait for events to be processed by the window procedure. It is no different for an app than it is for a DLL. The only difference of note is that the resources to create the Window would normally reside in the DLL's resources and not the main app's resources.

As for real-life examples, do you own a TWAIN device or scanner? Well, they work exactly the same way as you described. The user interface is implemented in a DLL provided by the manufacturer, and this GUI is initiated by the application (more exactly, the TWAIN manager).

But to get to this stage, you need to be a solid Windows programmer, or at the very least, know the fundamentals enough to not have to make serioous errors such as writing incorrect message loops, never calling GetLastError() if there is an issue, etc. All of these mistakes are corrected by looking at working code and studying it properly.

Regards,

Paul McKenzie

[ney06]

is this really for twain scanning code ???