Proplem with a static library - C / C++ / MFC Discussion Boards

Re: Message Mapping - VC++ 6.0 into Studio 2005

Roger Stoltz6-Nov-08 2:00

6-Nov-08 2:00

I saw you've solved this, but just for the record:

The fact that message handlers for messages sent to windows returns an LRESULT is not new or changed in any way since VC6, this has always been the case. Have a look at MSDN[^].
The difference between VS2005 and VC6 is that in the later version you'll get a compiler error whereas the older version simply ignores it, which will put the developer in trouble later on.

Just like Iain I made this infamous error many years ago which corrupted my stack as well.

My point is that if you encounter other MFC applications with user defined message handlers mapped with ON_MESSAGE or ON_REGISTERED_MESSAGE that does not return an LRESULT, correct it immediately and save you a lot of future trouble.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Browse for folder new folder path

Royce Fickling5-Nov-08 7:59

Royce Fickling

5-Nov-08 7:59

Hi,

I am using the Browse For Folder dialog to allow selection of an existing folder or the creation of new folder. When the user clicks the Make New Folder button the tree allows the creation of the folder but doesn't return the folder name so that it can be shown in the status text control.

How can I detect the closing of the edit control and get the new folder path?

Thanks

Re: Browse for folder new folder path

David Crow5-Nov-08 8:02

David Crow

5-Nov-08 8:02

What about the lpfn member (of the BROWSEINFO structure)?

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: Browse for folder new folder path

Royce Fickling5-Nov-08 9:48

Royce Fickling

5-Nov-08 9:48

I know how to use the lpfn function pointer, but I am not sure what you are suggesting. I am setting that pointer to my callback function, but it is not being called when the user is doneediting the folder name.

Re: Browse for folder new folder path

David Crow5-Nov-08 9:52

David Crow

5-Nov-08 9:52

Royce Fickling wrote:
I am setting that pointer to my callback function, but it is not being called...

Is it being called for anything? I would have thought a TVN_ENDLABELEDIT notification would be sent.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: Browse for folder new folder path

Royce Fickling5-Nov-08 10:07

Royce Fickling

5-Nov-08 10:07

No, it is being called with the BFFM_INITIALIZED and BFFM_SELCHANGED messages and nothing else. I thought maybe I needed to set another flag, but I don't know what it might be.

Re: Browse for folder new folder path

David Crow5-Nov-08 10:11

David Crow

5-Nov-08 10:11

I do not see any other ones here that look promising. Frown | :(

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Proplem with a static library

Stonie965-Nov-08 5:42

Stonie96

5-Nov-08 5:42

Good day, i'm having a proplem with a static library i'm creating. But before i'll go into the details of the library i'm gonna give you some details about the app that is importing it.

But basicly this is a raw exe. All standard libraries such as the default C Runtime Libraries are not included. Which means i have to declare my own entrypoint for the application which looks like this.

#pragma comment(lib, "SkyNet_RTL.lib")
#include <windows.h>
#include "SkyNetLoader.h"
#include "..\SkyNet_RTL\SkyNet_RTL.h"

void __stdcall __SkyNetLoaderEntry()
{
	_SkyNet_RTL_INIT();
	//hSkyNetLoaderModule = GetModuleHandleW(NULL);
	//LPWSTR lpszCommandLine = GetCommandLineW();
	int entry_ret = 1; // __SkyNetLoaderFunc(hSkyNetloaderModule, lpszCommandLine);
	ExitProcess(entry_ret);
}
</windows.h>

The only libraries that link with the application is kernel32.dll and ntdll.dll which actually link to all applications.
Don't know if it matters but that standard calling convention for the exe is __stdcall and __cdecl for the static library.

The function _SkyNet_RTL_INIT(); is a function implemented in the static library called SkyNet_RTL.dir (Skynet Runtime library). As you see i've included the SkyNet_RTL.lib in the pragma comment directive so it should be linked into the build.
The header file for the static lib IS the same file for both the application and the static library.
The Compiler puts the .lib file and the export file into the folder containing the .exe so it should be present for the linker to grab.
The static lib project is a dependency for the application so if there are any changes to the lib it's rebuilt and put into the application project's folder for linking before the application itself is built.

Here's the header file for the static library

////////////// SKYNET RUNTIME LIBRARY HEADER ///////////////////////////
//#pragma comment(lib, "SkyNet_RTL.lib")
#ifndef __SKYNET_RUNTIME_LIBRARY_V01
#define __SKYNET_RUNTIME_LIBRARY_V01

bool __cdecl _SkyNet_RTL_INIT(void);

//#define SkyNetRTL_Initialize() _SkyNet_RTL_INIT()

#endif

Plain and simple. _SkyNet_RTL_INIT(void) is implemented in SkyNet_RTL.cpp like this

#include "SkyNet_RTL.h"

//typedef int BOOL

bool __cdecl _SkyNet_RTL_INIT(void)
{
	return true;
}

The static library is also a completely raw library, which excludes all standard libraries for linking (CRT, etc). But right now the symbols dont seem to be exported. I've messed around with the settings alot and i constantly get.

SkyNet Loader error LNK2019: unresolved external symbol "bool __cdecl _SkyNet_RTL_INIT(void)" (?_SkyNet_RTL_INIT@@YA_NXZ) referenced in function "void __stdcall __SkyNetLoaderEntry(void)" (?__SkyNetLoaderEntry@@YGXXZ)

Atm i dont see anything wrong, i've gone trough quick articles on static libraries and none seem to do anything other then what i'm doing here excluding the fact that my lib and app are completely raw (my compiler/linker settings have been modified alot, no RunTime checks, etc).
The lib and export files are present for the application to be linked with.

If someone can point me in the right direction it would be greatly appreciated, and btw if you are wondering why the explicit __cdecl in the library function it was because i thought perhaps the calling conventions could change something, it was originally made __stdcall by the compiler even though the standard calling convention for this build is __cdecl.

Re: Proplem with a static library

Stonie965-Nov-08 7:46

Stonie96

5-Nov-08 7:46

Problem solved. Somehow building the lib in debug mode seems to screws up the export mechanism. No problem when the static lib is built in release.

Write to excel

hellogany5-Nov-08 3:30

hellogany

5-Nov-08 3:30

Hi all
I am trying to write all my datas from my VC++ application to excel sheet.I wrote the code using c++.But the datas written in the excel sheet was not up to the expectation.
Can anyone suggest me a better way of writing the excel sheet from application.If possible with an exampl....

Thanks
gany

Re: Write to excel

achainard5-Nov-08 4:00

achainard

5-Nov-08 4:00

C++ Typelib tuto : http://www.codeproject.com/KB/wtl/WTLExcel.aspx

PS: You can made it without WTL, with minor modification...

A++

...

Re: Write to excel

hellogany5-Nov-08 16:11

hellogany

5-Nov-08 16:11

HI i m using visual studio 6.0 , not vc++.net

Rather i want to write a excel file....

Re: Write to excel

achainard5-Nov-08 23:35

achainard

5-Nov-08 23:35

If i remember effectively #import don't work with vc6 but there's an other way to generate typelib header... try "Ole/Com viewer" or MIDL in command line... i Don't remember exactely it's to old... or ask to some one that have VC7 or higher version and the same excel version to generate header for you (i use Office 2003 but it must be compatible with newer version), h file is store on : C:\Documents and Settings\xxxxxxx\Local Settings\Temp

This method allow you to made what you want with excel : read write xls file (without displaying excel interface), integrated excel on your application like ie made when you open an excel file on the web...

If you want to read or write file that can be read or write by excel the easy way is the csv file format...

A++

...

Re: Write to excel

David Crow5-Nov-08 6:05

David Crow

5-Nov-08 6:05

See here.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

how to get the HWND from the windows on the "locked screen"

Krzysztof Gorgolewski5-Nov-08 3:21

Krzysztof Gorgolewski

5-Nov-08 3:21

hi there,

i'm trying to get the window handle from the only window, when my windows is locked. it has the "Computer Locked" title, so first i tried FindWindow(NULL, "Computer Locked"), but nothing. then i tried GetWindow(GetDesktopWindow(), GW_HWNDFIRST), because it's the (hopefully) one and only active window on the locked screen. but nothing. and i also tried WindowFromPoint with the mid point of my screen, because the "computer locked" window is centered an the screen. but no luck at all.

sooo, anyone an idea or hint, how to get this _hard to get_ window handle?

regards

ps: google is also not giving any useful results

Re: how to get the HWND from the windows on the "locked screen"

Iain Clarke, Warrior Programmer5-Nov-08 4:52

Iain Clarke, Warrior Programmer

5-Nov-08 4:52

I would try using Spy++, which comes with visual studio (at least it did - I assume it still does with newer stuff than I have), and see if you can find your desired window.

Maybe it has a special window class name you can look for?

And even if it is the only application you can see, I bet there are a loads of top level windows you can't see. Most tray apps will have an invisible one for getting messages at the very least.

Iain.

Re: how to get the HWND from the windows on the "locked screen"

SandipG 5-Nov-08 5:25

SandipG

5-Nov-08 5:25

Hi Iain,
How can we use SPY++ after the computer screen in locked??
Can you please elaborate.. I tried to get the window handle but no success Frown | :(

Thanks!!

Regards,
Sandip.

Re: how to get the HWND from the windows on the "locked screen"

David Crow5-Nov-08 6:07

David Crow

5-Nov-08 6:07

Krzysztof Gorgolewski wrote:
...so first i tried FindWindow(NULL, "Computer Locked"), but nothing.

What does that function return? If NULL, have you tried calling GetLastError()? Are you sure that is the exact name of the window being sought?

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: how to get the HWND from the windows on the "locked screen"

Roger Stoltz5-Nov-08 6:36

Roger Stoltz

5-Nov-08 6:36

Krzysztof Gorgolewski wrote:
i'm trying to get the window handle from the only window, when my windows is locked.

So you want to get a handle to the window that is displayed when the user session is locked...

Why?
In order to do what? Suspicious | :suss:

From a technical aspect I doubt this is even possible, but here are my thoughts...
From that screen you can switch user through "Fast User Switching", which means that you create or active another desktop. This suggests to me that this window doesn't even belong to the session your application is running in and this is probably also why ::FindWindow() cannot find the window.

If you want to know when the session gets locked you can register for session notifications with WTSRegisterSessionNotification() and process the WM_WTSSESSION_CHANGE message.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: how to get the HWND from the windows on the "locked screen"

SimonSays5-Nov-08 7:37

SimonSays

5-Nov-08 7:37

You pretty much don't. The security screen is on a different desktop (read up on Windows Desktop objects) which is completely inaccessible to normal code.

Re: how to get the HWND from the windows on the "locked screen"

Krzysztof Gorgolewski5-Nov-08 8:11

Krzysztof Gorgolewski

5-Nov-08 8:11

thanks for your thoughts.
hm... so it's not possible because of security reasons? not nice to hear...
i already got the message, when the screen/computer is locked (after the lock i'm changing the wallpaper and additionally wanted to move the f§%*$ng ... ehm ... nice "computer locked" window).
ok, GetLastError i will have to check later. and the thing with a different desktop was/is also in my mind. maybe it's possible to find/enumerate through the available desktops and have a look for my desired window (if the security allows it : )

so long

Re: how to get the HWND from the windows on the "locked screen"

Krzysztof Gorgolewski5-Nov-08 8:31

Krzysztof Gorgolewski

5-Nov-08 8:31

oh yes:

http://msdn.microsoft.com/en-us/library/ms682573(VS.85).aspx => "... Applications cannot access the Winlogon desktop ..."

maybe i can change the access rights for my "default" desktop/program somehow to get to this "winlogon" desktop's content?!?

criss

Re: how to get the HWND from the windows on the "locked screen"

Krzysztof Gorgolewski5-Nov-08 18:42

Krzysztof Gorgolewski

5-Nov-08 18:42

one more thought in the morning: once i used an application called Active Desktop Calendar. and it was displaying its calendar/todo/etc also on the locked screen.
soo that means, if this application is able to access the Winlogon desktop, why should i not be able?

regards

Re: how to get the HWND from the windows on the "locked screen"

SandipG 5-Nov-08 20:49

SandipG

5-Nov-08 20:49

Does this[^] help?

Regards,
Sandip.

Re: how to get the HWND from the windows on the "locked screen"

Krzysztof Gorgolewski5-Nov-08 21:21

Krzysztof Gorgolewski

5-Nov-08 21:21

still i didn't had time to try anything new, but i let you know.

regards

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.