Re: Thank you ! - C / C++ / MFC Discussion Boards

John Uhlenbrock2-Sep-01 14:06

2-Sep-01 14:06

I asked this same question for SendMessage HERE once before. However, it appears as though the solution for SendMessage does not work for PostMessage.

I want to pass a CString as one of the parameters of PostMessage. How is this done?

Re: Post Message.

Michael Dunn2-Sep-01 15:08

Michael Dunn

2-Sep-01 15:08

I want to pass a CString as one of the parameters of PostMessage. How is this done?

Well, you can pass a pointer to a CString, however this will work only if the receiver of the message to is in the same process as the sender, otherwise the pointer will be meaningless. You also have to make sure that the CString object exists long enough for the receiver to use it. Since posted messages are handled asynchronously, you'll need to arrange this part yourself.

--Mike--
http://home.inreach.com/mdunn/
You are the weakest link, GOODBYE!

Re: Post Message.

Matt Gullett2-Sep-01 16:00

Matt Gullett

2-Sep-01 16:00

Assuming the target window is in the same process, you can send a CString via PostMessage like this:

void SendTextToWindow(HWND hwndTarget, UINT uiMessage, LPCSTR lpszText);
{
     CString* pText = new CString;
     (*pText) = lpszText;

     ::PostMessage(hwndTarget, uiMessage, (WPARAM)pText, 0);
}

Then, in the message handler for uiMessage,

LRESULT OnSomeMessage(WPARAM wParam, LPARAM lParam)
{
     CString* pText = (CString*)wParam;
     ASSERT(pText);

     // do something with pText

     delete pText;

     return 0;
}

I have used this, but I do not recommend it because there is a potential that the message could not make it to the target window and thus the CString never be destroyed. Also, this only works if the target window is in the same process. Ultimately, if you really need to do this often, I would recommend creating a manager class (something line CStringMessageManager), and have it be responspilble for deleting CString objects created and passed via PostMessage.

Re: Post Message.

Matt Gullett2-Sep-01 17:58

Matt Gullett

2-Sep-01 17:58

I went ahead and posted the code I use to deal with this situation. You can find it at
http://www.codeproject.com/useritems/sendcstring.asp

Simple DLL, Simple DLL, Simple DLL , P L E A S E !!!

2-Sep-01 9:05

I wrote a program by dialog project , that works excellent. Blush | :O

Now I need to convert it to DLL. Suspicious | :suss:

---------------------------------------------------------
I opened project (MFCAppWizars(dll)).
I attached the recource dialog and all his class (CMainDlg). Cool | :cool:

I opened also exe project for test the dll and there I wrote:

HINSTANCE hInstance;
hInstance = LoadLaibrary("main.dll");
---------------------------------------------------------
Frown | :(

My questions:

1. Where have I write CMainDlg::DoModal() if I want that it wiil shown immidietly when this dll will act ? Confused | :confused:

2. How can I get and return parameters ??? Confused | :confused:

3. How can I acted this dll from the another exe program ??? Confused | :confused:

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

PLEASE !!! HELP ME !!! Cry | :((

Thanks

Re: Simple DLL, Simple DLL, Simple DLL , P L E A S E !!!

Mukkie2-Sep-01 10:44

Mukkie

2-Sep-01 10:44

Do not use LoadLibrary for this case.

In dialog class declaration (header file) put:
#ifdef DLL_BUILDING
#define DllExportImport __declspec(dllexport)
#else
#define DllExportImport __declspec(dllimport)
#endif

class DLLExportImport CMyDialog : public CDialog
...
In project settings of dll add DLL_BUILDING define

The same header, do include in exe project.
(As You can see, this time CMyDialog class will be defined as dllimport).
In link tab (project settings) of exe project, add path (relative or full) to .lib file generated during build of dll.

It will work

Thank you !

3-Sep-01 0:15

Although I dont just understood it. Confused | :confused:

Thank you!

Rose | [Rose]

Re: Thank you !

Mukkie3-Sep-01 12:35

Mukkie

3-Sep-01 12:35

Do not use LoadLibrary for this case.

Create DLL project. In this project, create header file. In this header write:

In dialog class declaration (header file) put:
#ifdef DLL_BUILDING
#define DllExportImport __declspec(dllexport)
#else
#define DllExportImport __declspec(dllimport)
#endif

class DLLExportImport CMyDialog : public CDialog
...
In project settings of dll add DLL_BUILDING define
That's all for now for dll project. Compile and forget.

Let's go back to exe project.Include the header, You have created in the dll.
The difference, is that when building dll, DLL_BUILDING macro will be defined, so DLLExplortImport will be changed by preprocessor into __declspec(dllexport). When building exe project, You won't have DLL_BUILDING defined, so __declspec(dllimport) will be used.
In link tab (project settings) of exe project, add path (relative or full) to .lib file generated during build of dll.

For more information, see msdn and search for dllexport or dllimport.

uki?

Re: Thank you !

3-Sep-01 21:52

An so what's the point about COleDropTarget?

Re: Simple DLL, Simple DLL, Simple DLL , P L E A S E !!!

Jim A. Johnson2-Sep-01 13:21

Jim A. Johnson

2-Sep-01 13:21

Why do you need to put it in a DLL?

about COleServerItem

Maer7272-Sep-01 5:31

Maer727

2-Sep-01 5:31

Does "COleServerItem" have something to do with strctured storage?

Thanks.

Maer

about COleClientItem

Maer7272-Sep-01 5:29

Maer727

2-Sep-01 5:29

Does "COleClientItem" have something to do with strctured storage?

Thanks.

Maer

Before The System

The_Server2-Sep-01 2:32

The_Server

2-Sep-01 2:32

Hi, all!!!

Does anyone know how can I catch CTRL+ALT+DEL before the system (win 2000)?

10x.

BTW: for some of you that wished for CodeProject irc server
I create a channle on DalNet called "#CodeProject"

Re: Before The System

Anders Molin2-Sep-01 2:48

Anders Molin

2-Sep-01 2:48

To be honest I don't think it's possible on Win2k...

for some of you that wished for CodeProject irc server I create a channel on DalNet called "#CodeProject"
Yea, just sad it's always empty... Cry | :((

- Anders

Money talks, but all mine ever says is "Goodbye!"

Re: Before The System

The_Server2-Sep-01 10:50

The_Server

2-Sep-01 10:50

yeah I know Cry | :((

but if people will come and stay instad of come and go.
then this place will NOT be empty. Smile | :)

BTW: for some of you that wished for CodeProject irc server
I create a channle on DalNet called "#CodeProject"

Re: Before The System

2-Sep-01 3:10

You probably have to replace som input DLL( _very_ dangerous ).
What if the user installs a servicepack?

Re: Before The System

The_Server2-Sep-01 10:52

The_Server

2-Sep-01 10:52

I have service pake 3, and I don't really know what it means ? Confused | :confused:

BTW: for some of you that wished for CodeProject irc server
I create a channle on DalNet called "#CodeProject"

Re: Before The System

Mukkie2-Sep-01 10:48

Mukkie

2-Sep-01 10:48

Look at Gina in msdn.
Maybe low level keyboard hook may help: SetWindowsHookEx ??

Re: Before The System

| mProject |2-Oct-01 0:54

| mProject |

2-Oct-01 0:54

Hi,

I had problem of CTRL+ALT+DEL last few days. I searched discussion board for that but didnot found proper solution. I only found that use Gina Dll inplace of microsoft's MSGina.dll. That is not proper solution. Now i solved my purpose to disable CTRL+ALT+DEL in win2000. I don't know about WinNT but it will work for it also. So i want to contribute this part to all user.

Steps are as follows :

1. Open Microsoft SDK Examples. In That Example, Open GinaStub example.
2. Find function
int
WINAPI
WlxLoggedOnSAS(
PVOID pWlxContext,
DWORD dwSasType,
PVOID pReserved
)

3. In this function remove all code written and only return like this
return WLX_SAS_ACTION_NONE;
4. So it looks like this...
int WINAPI WlxLoggedOnSAS(
PVOID pWlxContext,
DWORD dwSasType,
PVOID pReserved
)
{
return WLX_SAS_ACTION_NONE; // Return code for doing nothing ... return to desktop
}
5. Now Make dll.
6. Goto Registry by regedit.
7. goto
\HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
(WindowsNT is also there. So dont confused it is | Windows(Space)NT | okay)
8. Make New string value and give data like this
name : GinaDLL
Type : REG_SZ
Data : C:\WinNT\System32\mygina.dll (path of your gina dll(suppose mygina.dll))
9. Reboot computer And your control+alter+delete not worked at all.

----------------------------------------------------------------------------------------
If You want this mygina.dll then contact me on my personal email address.
manish_ld@rediffmail.com
m_codeproject@rediffmail.com
if still not contact me then and then try : pansiniya_manish@hotmail.com
----------------------------------------------------------------------------------------
Thanx in advance.
Roll eyes | :rolleyes:

--------------------------------------------------
Say Whatever You Know.
Helping other people is good for health.
=========
Manish
=========
---------------------------------------------------

Re: Before The System

Manish Pansiniya28-Oct-04 6:32

Manish Pansiniya

28-Oct-04 6:32

Hello,

My email address is changed.

Changed email address is : manish_ld@yahoo.com.

Please mail on this address for gina.dll.

Enjoy~!!!

Re: Before The System

Manish Pansiniya28-Oct-04 6:33

Manish Pansiniya

28-Oct-04 6:33

Hello,

My email address is changed.

Changed email address is : manish_ld@yahoo.com.

Please mail on this address for gina.dll.

Enjoy~!!!

ASAP: convertion ?

The_Server1-Sep-01 23:40

The_Server

1-Sep-01 23:40

I have this in the .h file:

typedef enum { _P1=0, _P2=15, _P3=6, _PDefault=15} PDef;
 
MyFunc(PDef a){...};

and when I use it .cpp file like this:

MyFunc( (PDef)1785);  // works ok and that's not good

is there a way I can overwrite the '(PDef)' convertion?
e.g.
(PDef)1785- will return _PDefault ?
or somthing like that

thanks

BTW: for some of you that wished for CodeProject irc server
I create a channle on DalNet called "#CodeProject"

Re: ASAP: convertion ?

Michael Dunn2-Sep-01 6:38

Michael Dunn

2-Sep-01 6:38

Nope, that's how enums work. An enum is implemented as an int. When you cast to PDef, it's up to you to make sure the number is within range of the enum.

--Mike--
http://home.inreach.com/mdunn/
You are the weakest link, GOODBYE!

: _CRTDBG_MAP_ALLOC, stdlib.h, crtdbg.h и malloc.h

Dmitriy Reznitskiy1-Sep-01 23:15

Dmitriy Reznitskiy

1-Sep-01 23:15

Thanx to MSDN: MSDN Library/Technical Articles/Visual Tools/Visual C++/Detecting and Isolating Memory Leaks Using Microsoft Visual C++

I tried to detect, where i've got mem. leak.
As dedscribed, i insert

#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>

i my header.

but if there is #include <malloc.h> after those strings, i get
Compiling...
StdAfx.cpp
d:\program files\microsoft visual studio\vc98\include\malloc.h(105) : error C2059: syntax error : 'constant'
d:\program files\microsoft visual studio\vc98\include\malloc.h(105) : error C2733: second C linkage of overloaded function '_calloc_dbg' not allowed
d:\program files\microsoft visual studio\vc98\include\malloc.h(105) : see declaration of '_calloc_dbg'
d:\program files\microsoft visual studio\vc98\include\malloc.h(106) : error C2059: syntax error : 'constant'
d:\program files\microsoft visual studio\vc98\include\malloc.h(106) : error C2733: second C linkage of overloaded function '_free_dbg' not allowed
d:\program files\microsoft visual studio\vc98\include\malloc.h(106) : see declaration of '_free_dbg'
d:\program files\microsoft visual studio\vc98\include\malloc.h(107) : error C2059: syntax error : 'constant'
d:\program files\microsoft visual studio\vc98\include\malloc.h(107) : error C2733: second C linkage of overloaded function '_malloc_dbg' not allowed
d:\program files\microsoft visual studio\vc98\include\malloc.h(107) : see declaration of '_malloc_dbg'
d:\program files\microsoft visual studio\vc98\include\malloc.h(108) : error C2059: syntax error : 'constant'
d:\program files\microsoft visual studio\vc98\include\malloc.h(108) : error C2733: second C linkage of overloaded function '_realloc_dbg' not allowed
d:\program files\microsoft visual studio\vc98\include\malloc.h(108) : see declaration of '_realloc_dbg'
d:\program files\microsoft visual studio\vc98\include\malloc.h(116) : error C2059: syntax error : 'constant'
d:\program files\microsoft visual studio\vc98\include\malloc.h(116) : error C2733: second C linkage of overloaded function '_expand_dbg' not allowed
d:\program files\microsoft visual studio\vc98\include\malloc.h(116) : see declaration of '_expand_dbg'
d:\program files\microsoft visual studio\vc98\include\malloc.h(125) : error C2059: syntax error : 'constant'
d:\program files\microsoft visual studio\vc98\include\malloc.h(125) : error C2733: second C linkage of overloaded function '_msize_dbg' not allowed
d:\program files\microsoft visual studio\vc98\include\malloc.h(125) : see declaration of '_msize_dbg'
Error executing cl.exe.

Re: : _CRTDBG_MAP_ALLOC, stdlib.h, crtdbg.h и malloc.h

Tomasz Sowinski3-Sep-01 0:50

Tomasz Sowinski

3-Sep-01 0:50

Just include crtdbg.h after malloc.h

Tomasz Sowinski -- http://www.shooltz.com

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