C / C++ / MFC

adding Libs now only warnings

28-Jun-04 23:07

Make sure your linker dependancies are set up the same way in both configurations. In VC++ .NET the option you need to look at is in the project properties page under linker and in input.

Anonymous28-Jun-04 23:27

Anonymous

28-Jun-04 23:27

I added the lib files in link

now it giving warnings as follows
now wt should i do ?

Linking...
LINK : warning LNK4089: all references to "ADVAPI32.dll" discarded by /OPT:REF
LINK : warning LNK4089: all references to "OLEPRO32.DLL" discarded by /OPT:REF
LINK : warning LNK4089: all references to "WINMM.dll" discarded by /OPT:REF

cam.exe - 0 error(s), 3 warning(s)

How to open dr.watson's .wlg file in win xp?

rrrado28-Jun-04 22:37

rrrado

28-Jun-04 22:37

I need to open dr watson's .wlg file created in win 98 after my application crashed. I've got .wlg file from the user, but I don't know how to open it.
Thanks !

rrrado

SetProcessDefaultLayout()

Mohammad Adel28-Jun-04 22:37

Mohammad Adel

28-Jun-04 22:37

in the docs it is said that the SetProcessDefaultLayout()is found in windows.h and defined in winuser.h.
I included both files, and the compiler can't find the function.
I tried to open the winuser.h and I couldnot find the function.any help?

Windows xp

sirtimid28-Jun-04 21:57

sirtimid

28-Jun-04 21:57

I would like to make an app that will not allow the user to execute any of the windows xp applications.
Does anybody know how to do that?
I try to do it by looking all the processes that are running and if there is any non system or any other necessary process, I terminate it with the TerminateProcess function.
The problem is when the user try to run the windows explorer. I can't see that process when it is running.

Re: Windows xp

OBRon29-Jun-04 3:04

OBRon

29-Jun-04 3:04

We try to avoid helping people write virus software. How about using the security built into XP and removing any NTFS permissions to the programs you don't want people using.

Use of extern

sweep12328-Jun-04 21:46

sweep123

28-Jun-04 21:46

With the extern, can you use your own defined type to share global data or is it limited to int, bool float etc.

i.e.

struct
{
int x, y
float buff[10];
bool onOff;
}myStruct

extern myStruct g_myStruct1;

and how would you init the data.

Xzyx987X28-Jun-04 22:24

28-Jun-04 22:24

1. Yes, but I'm sure you could've figured it out by trying it...
2. Globals are automatically inited to 0. Any other initializtions you may need to do could be accomplised by a special funtion you pass the structure to before you use it.

sweep12328-Jun-04 22:33

sweep123

28-Jun-04 22:33

I though I understood extern but having second thoughts.

This is because sometimes get linker error if include extern in the global section of the main program.

i.e. they seem to work without using extern in the global section, but only use extern in units where you wish to use them.

e.g.

int g_nMyInt = 2;<br />
bool g_bMyflag = true;

Main()

and then use in the other unit:-

extern int g_nMyInt;<br />
extern bool g_bMyflag;

Wich is correct?

Xzyx987X28-Jun-04 23:01

28-Jun-04 23:01

You only need externs in files where the global variables aren't already defined. Just keep that in mind and you shouldn't have any problems.

sweep12328-Jun-04 23:22

sweep123

28-Jun-04 23:22

st to re-cap the following are both OK?

extern int g_nMyInt = 3;
extern CMyType g_Mystruct1; // Initialised by a routine at start-up
extern bool g_bMyFlag = true;

Main()

and

int g_nMyInt = 3;
CMyType g_Mystruct1; // Initialised by a routine at start-up
bool g_bMyFlag = true;

Main()

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

and use in other units as required:-

extern int g_nMyInt;
extern CMyType g_Mystruct1; // Initialised by a routine at start-up
extern bool g_bMyFlag;

Many thanks.

Simple questions are sometimes not simple

Rick York29-Jun-04 6:16

Rick York

29-Jun-04 6:16

You can't initialize an "extern" variable as you are in the first set. Otherwise, those are OK.

__________________________________________
a two cent stamp short of going postal.

Setting up Visual C++ .NET to break on a windows error

Johnny ²29-Jun-04 4:48

Johnny ²

29-Jun-04 4:48

There is no guarantee that any variable, whether global or local, is initialised to 0. In a debug build, using VisualStudio, they do get initialised to 0, but that doesnt apply in a release build.

AnimateWindow() Question

User 58385228-Jun-04 21:37

User 583852

28-Jun-04 21:37

Hello
Does anyone know of a way to use AnimateWindow() to fade out a window without blocking at all. If I use the sugested param of 200 ms my application feels unresponsive as the main thread is blocked. The documentation says I cannot call this on a window owned by another thread so I cant spawn off a thread to do it

Xzyx987X28-Jun-04 20:48

Way to Prevent memeory leak?

28-Jun-04 20:48

I'm experiencing a very weird bug that I can't determine the source of. My only clue are some windows errors which shouldn't be occuring. And I don't just mean I think everything is set up so they shouldn't be occuring, I mean that between when I call SetLastError(0) and GetLastError() I'm not even calling any code that is capable of triggering them. The only explanation I could think of is that my program is somehow corrupting itself, but I've looked through my code carefully and I don't see how. Plus, the VC++ debugger isn't reporting and out of bounds memory access, buffer overuns, or anything else for that matter. I'd like to know if it's possible to set up VC++ to break on a windows error so I can find out excactly where the errors are coming from and why, without having to put a GetLastError() between every line of code.

nachilau28-Jun-04 20:29

nachilau

28-Jun-04 20:29

Hello all,

I have a question on about how to prevent to prevent the memory leak? I am writing a window program, and I have an Assert() so that if any fatal erorr occured, the Assert() will call
Sleep(INFIITE) to stop the program, and print out the error message to the user. By doing that, the only way to exit the program after Assert() has been called is to close the window. However, it causes a problem which is that even though the desturctor of each classes in the program will be called when the user close the window, there may still some memory leak in the local scoop when I use Assert() like this, eg in funciton f()

f() {
char* name = new char[10];
Assert(AnyError(), "Fatal Error!");
strcpy(name, "Hello");
delete [] name;
}

For example, if I get the Assert() if I get any error in f(), then when the user close the window, I will have a memory leak for 10 bytes. What is the best way to solve the problem? I don't want to use the try and catch block since the code will be mess up with all those try and catch block. And I really want to stop the program when the fatal error occurs. Any ideas? Thanks!

Nacho

User 58385228-Jun-04 20:43

User 583852

28-Jun-04 20:43

Im not sure i fully understand.
If you program has hit a fatal error and is exiting then you could probably not worry and rely on the OS to clean up after you.

Perhaps you could use a smart pointer

A smart pointer is usually a template class that pretends to be a pointer by providing the -> and * operators.
Because the smart pointer itself is on the stack its destructor will be called and you can delete the memory then.
I think the stl has a smart ptr template. You might want to start there

However if your Assert() function never returns then that wont work either.

Why dont you throw an exception in your Assert() function and catch it at a higher level

Good luck

nachilau28-Jun-04 21:09

nachilau

28-Jun-04 21:09

Thanks for your suggestion. I know the way the smart pointer works, but as what you said, since the Assert function never return, smart pointer is no use in this case. Also, if I throw an exception, then, the try and catch block will go around in my code. That is so messy then! But thanks for your comment!!

User 58385228-Jun-04 21:34

User 583852

28-Jun-04 21:34

As you are trying to deal with a rather general error could you not catch the exception once at a higher level? In your main() for example. If you are writing an MFC app im sure you could override CWinApp::Run() and put your try..catch in there.

wb28-Jun-04 21:42

28-Jun-04 21:42

if you run on something else than Win 3.11
the OS cleans up after you...

nachilau28-Jun-04 21:51

nachilau

28-Jun-04 21:51

Thanks! But do you know how the OS clean is up for me? You mean the OS will keep doing a background search for the memory leak? Am I right? Thanks!