C / C++ / MFC

Re: dialogs (perhaps modal) that dismiss upon losing focus

4-May-04 8:32

This is indeed a valid concern, certainly a impediment to the general applicability of this design.

Though this class has to be general enough to use in a few different contexts, the primary usage is selecting options via listboxes, buttons, etc.

David Crow4-May-04 8:42

Re: dialogs (perhaps modal) that dismiss upon losing focus

4-May-04 8:42

jonathanleebrown wrote:
...the primary usage is selecting options via listboxes, buttons, etc.

Ok, that's what dialog boxes do anyway. So why make it go away when it loses focus?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

jonathanleebrown4-May-04 9:20

Re: dialogs (perhaps modal) that dismiss upon losing focus

4-May-04 9:20

Below is the rationale for this design, perhaps you can think of a more appropriate way to offer the characteristics described there?

BTW, thanks for the discussion David. I'm very appreciative!

The dialog design allows for a different organization of controls from some typical dialog (or property sheet) layouts.

For instance: if you offer a property sheet for a complex object (in a direct manipulation environment), there can be many controls required to offer full access to those properties. Offering more than just a few controls really necessitates multiple property pages. The problem here is that this can greatly limit visibility of controls (and so properties of the object).
Furthermore, if certain properties relate to control groupings on more than one page, you pretty well have to duplicate that control on multiple pages. Study results on this topic show that new users might not realize that this particular control is duplicated, causing many usability problems.

So what we need is a some control layout that can offer the conceptual grouping of controls while maintaining good visibility that helps maintain the user's understanding of control relationships.

Finally, considering the hierarchical nature of this design; if the dialogs required pressing the OK button for every dialog presented, this can increase task time beyond what is acceptable for the project.

jonathanleebrown4-May-04 9:30

Re: dialogs (perhaps modal) that dismiss upon losing focus

4-May-04 9:30

Thinking about this a bit more, the dialog class would behave much like the VC++ unpinned properties (dialog? Miniframe?) sans caption bar and close button.

David Crow4-May-04 10:07

Re: dialogs (perhaps modal) that dismiss upon losing focus

4-May-04 10:07

You might want to look at the WM_ACTIVATE and WM_ACTIVATEAPP messages. These are the messages being sent to the unpinned Properties dialog.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

jonathanleebrown4-May-04 10:14

Re: Broadcasting a message

4-May-04 10:14

Hmmm, thanks a lot for the tip. I'll do that.

Broadcasting a message

#realJSOP4-May-04 7:24

#realJSOP

4-May-04 7:24

I'm trying to broadcast a message using this:

<br />
::SendNotifyMessage(HWND_BROADCAST, WM_MYMSG, 0, 0);<br />

If another app, I've got a handler in my CMainFrame class that handles that message, like so:

In the header file:

<br />
protected:<br />
	//{{AFX_MSG(CMainFrame)<br />
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);<br />
	//}}AFX_MSG<br />
	afx_msg LRESULT OnReadyRemote(WPARAM wParam, LPARAM lParam);<br />
	DECLARE_MESSAGE_MAP()<br />

And in the CPP file:

<br />
LRESULT CMainFrame::OnReadyRemote(WPARAM wParam, LPARAM lParam)<br />
{<br />
	wParam;<br />
	lParam;<br />
	AfxMessageBox("Kicker Ding");<br />
	return 1L;<br />
}<br />

The message is registered like so (in a common header file used by both apps):

<br />
//const UINT WM_MYMSG = ::RegisterWindowMessage("MySpecialMsg_0x1E240");<br />

----------------------

I'm fairly certain that the app braoadcasting the message is actually doing so, but I know for a fact that the other app isn't seeing it.

Anyone have any ideas?

------- sig starts

"I've heard some drivers saying, 'We're going too fast here...'. If you're not here to race, go the hell home - don't come here and grumble about going too fast. Why don't you tie a kerosene rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt

"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

"You won't like me when I'm

David Crow4-May-04 8:27

Re: Broadcasting a message

4-May-04 8:27

Are you missing:

ON_REGISTERED_MESSAGE(WM_MYMSG, OnReadyRemote);

in the message map?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

#realJSOP4-May-04 8:49

#realJSOP

4-May-04 8:49

ON_MESSAGE won't handle a registered message?

I'll give it a go.

------- sig starts

"I've heard some drivers saying, 'We're going too fast here...'. If you're not here to race, go the hell home - don't come here and grumble about going too fast. Why don't you tie a kerosene rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt

"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

"You won't like me when I'm

Re: Broadcasting a message

David Crow4-May-04 9:00

marshalling COM to .NET problem

4-May-04 9:00

John Simmons / outlaw programmer wrote:
ON_MESSAGE won't handle a registered message?

If it did, I suppose there would not be much need for ON_REGISTERED_MESSAGE().

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Member 9300224-May-04 7:03

Member 930022

4-May-04 7:03

Could someone please help with marshalling to .NET. I posted this question here, not in C#, 'cause I know for sure the mistake is somewhere in .idl or cpp file.
I have a Win32 C++ project with the following three files:

//tlbsamp.cpp///////////////////////////////////////////////////
#include <windows.h>
interface ITest{bool MyFunc();};
class Test:public ITest{
int i;
public:
Test(){i=10;}
int MyFunc(){return i;}
};

ITest* __stdcall MyDll_CreateTest(){
return new Test();
}
int __stdcall MyDll_CreateInt(){
return rand();}

BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved )
{return TRUE;}
//tlbsamp.def//////////////////////////////////////////////////////////
LIBRARY TLBSamp
DESCRIPTION 'Sample DLL'
EXPORTS
MyDll_CreateTest
MyDll_CreateInt
//tlbsamp.idl/////////////////////////////////////////////////////////////
import "oaidl.idl";
import "ocidl.idl";
[ uuid(983EE63A-7FB0-494a-AD63-14F48347DB7A), lcid(0x0409), version(1.0) ]
library TLBSample
{
[object,uuid( 1F707072-05C6-4501-AD74-CFD57AB8002C)]
interface ITest:IUnknown
{int MyFunc ();}

[ version(1.0), dllname("TLBSamp.dll")]
module MyDllFunctions
{
[entry("MyDll_CreateTest")]
ITest* __stdcall CreateTest();
[entry("MyDll_CreateInt")]
int _stdcall CreateInt();
} };

I am compiling the project and get tlbsamp.dll ,tlbsamp.tlb, tlbsamp.lib, then I create a c# project, AddReference->COM->
Browse, all the .tlb file. In object browser I can see my ITest interface with MyFunk function. Here's the c# code.

using System;
using System.Runtime.InteropServices;
using TLBSample;
namespace Test_Call_MSDN_Dll
{
class Class1
{
[DllImport(@"E:\MyProgs\NET\TLBSamp\debug\tlbsamp.dll")]
public static extern TLBSample.ITest MyDll_CreateTest();

[DllImport(@"E:\MyProgs\NET\TLBSamp\debug\tlbsamp.dll")]
public static extern Int32 MyDll_CreateInt();
[STAThread]
static void Main(string[] args)
{
Console.WriteLine(MyDll_CreateInt().ToString());//OK-works fine
ITest spClass=MyDll_CreateTest();//ExecutionEngineException(???)
Console.WriteLine(spClass.MyFunc().ToString());
Сonsole.Read();
}
}
}

What am I doing wrong?
Thanks in advance!

Re: marshalling COM to .NET problem

Mike Dimmick4-May-04 11:26

Mike Dimmick

4-May-04 11:26

Ick. I don't think the P/Invoke and COM marshallers work well together. Use one or the other, but not both.

Stability. What an interesting concept. -- Chris Maunder

Recompiling Everything

Jeff Bogan4-May-04 6:41

Jeff Bogan

4-May-04 6:41

I copied a project over to another directory in VC 6.0, and I had some trouble with it not recompiling so I hit rebuild all. Now ALL the IDE will do is recompile - it is ignoring the precompiled headers, and rebuilding every single time. Is there a directory pointer that may be misplaced? Anybody encountered this problem before?

Re: Recompiling Everything

Antony M Kancidrowski4-May-04 6:50

Antony M Kancidrowski

4-May-04 6:50

The only time I have seen this is if the date/time of the file is after the current date/time.

Can be encountered when you save files and alter the clock backwards!!

Ant.

Re: Recompiling Everything

Jeff Bogan4-May-04 7:05

Jeff Bogan

4-May-04 7:05

Yep - that was it, thanks for the help.

Shared Data Problem

sweep1234-May-04 6:03

sweep123

4-May-04 6:03

All I want is the ability to share data between a DLL (Loaded dynamically) and a EXE application.

I have tried the shared data segment - no good (only for instances of the same program). Works with 2 EXEs - tried it today.

Next I tried Mailslots, but the Mailslot (Server) need to be in the DLL, so how does it read the Mailslot and how do you arrange for it to be created as no Entrypoint in the DLL.
I did try and arrange when one of the functions wa called it would first setup the Mailslot, but never managed to have the Client attach to it.

They must be a simple way to have 3 interger values shared between this EXE and DLL.

Been on the problem all day now!

Help!!

Michael Dunn4-May-04 6:07

Michael Dunn

4-May-04 6:07

Use a memory-mapped file, which is memory that can be shared between processes. Each module can call CreateFileMapping() and use the same name in the lpName parameter to get access to the same block of memory.

--Mike--
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Rick York4-May-04 6:27

Rick York

4-May-04 6:27

Just to elaborate a bit on what Michael said, what I would do is define a data structure that will contain your shared data. Then write a function that will return a pointer to the shared data. Within that function use the implemention that Michael described. I have used this technique many, many times and it is very easy.

__________________________________________
a two cent stamp short of going postal.

sweep1234-May-04 6:36

sweep123

4-May-04 6:36

I have already define a simple structure for the data (3 integers and a 80 char string).

I have used Mailslots (hence the structure already defined) and Sockets, but never used File Mapping before. Any simple examples?

I have seen some but wapped up with other IPC stuff. Also never used the GUID before.

regards,

Sweep.

Rick York4-May-04 11:02

Rick York

4-May-04 11:02

Here are two :

http://www.codeproject.com/threads/csharedstruct.asp

http://www.codeproject.com/threads/sharedmemipc.asp

Good luck.

__________________________________________
a two cent stamp short of going postal.