Memory access from another app? - C / C++ / MFC Discussion Boards

Re: Need help with SDI app

Daniel13248-Apr-04 10:48

Daniel1324

8-Apr-04 10:48

Thanks!

Re: Need help with SDI app

Renjith Ramachandran8-Apr-04 22:45

Renjith Ramachandran

8-Apr-04 22:45

dont worry. i am planning to post an article on Form Switching in SDI application. Smile | :)

I want to change ..Can u help me? Smile | :)

Strategy question

Cloaca8-Apr-04 9:55

Cloaca

8-Apr-04 9:55

Hi everyone,

I am starting a program that will allow serveral files to be viewed at once. My idea is to start with a dialog based app and then open other windows (sort of like views) to show each file. The files will be chosen from the main dialog of the app. The main dialog will also keep a list of the open files (windows) and allow the list of open files to be saved, and it will have a 'New' button so that new files can be created.
My question is about how to go about making these 'view' windows. I don't want to use MDI (since I want the user to be able to move the windows around without them all being stuck in a frame) and I can't use modal dialogs since they would block access back to the main app's dialog while they're open.
I was thinking about using modeless dialogs or going through the process of AfxRegisterWndClass and 'rolling my own' display windows.
What ideas do you have about how I should approach this. If I do my own windows, I'll need to handle mouse and keyboard events within them, and it seems like that stuff is somewhat provided (skeleton laid-out at least) to me if I use dialogs.

Thanks much, best regards, Smile | :)

Eric

Re: Strategy question

Maxwell Chen8-Apr-04 18:57

Maxwell Chen

8-Apr-04 18:57

Have a look at the style of the IDE of "Borland C++ Builder" ......

Maxwell Chen

Re: Strategy question

Cloaca9-Apr-04 8:54

Cloaca

9-Apr-04 8:54

Hi Maxwell,

I don't have ready access to Borland Builder. Can you point me to some ideas on the web. Searching Google gave me some ideas, but from what I can tell it looks somewhat like the Visual Studio IDE.

Thanks for the reply!
Eric Smile | :)

Re: Strategy question

Maxwell Chen11-Apr-04 16:16

Maxwell Chen

11-Apr-04 16:16

Borland IDE[^].

You see a man walking on the ice field, and that is the Windows desktop image. I am not telling you to use Borland tools as develop one, I am just talking about the IDE. You may develop your apps this way.

Maxwell Chen

Re: Strategy question

Cloaca12-Apr-04 5:13

Cloaca

12-Apr-04 5:13

Hi Maxwell,

Thanks for the idea! Smile | :)

Best,
Eric

Memory access from another app?

Andrew Stampor8-Apr-04 9:49

Andrew Stampor

8-Apr-04 9:49

I am trying to access a specific area of memory in another application and was wondering if anyone had any ideas on how to make that happen.

Re: Memory access from another app?

Dominik Reichl8-Apr-04 10:07

Dominik Reichl

8-Apr-04 10:07

Have a look at IPC techniques:

http://www.codeproject.com/threads/#Inter%2DProcess+Communication

Smile | :)

Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: Memory access from another app?

Anonymous8-Apr-04 10:56

Anonymous

8-Apr-04 10:56

One possible way is to access it directly, all you need to know is the address in another process that you want access/modify:
1. If necessary enable SeDebugPrivelege for your process.
a. OpenProcessToken (..,TOKEN_ADJUST_PRIVILEGES|TOKEN_QUERY )
b.LookupPrivilegeValue
c. AdjustTokenPrivileges, CloseToken
2. OpenProcess with desired access (PROCESS_VM_READ .. )
3.ReadProcessMemory/WriteProcessMemory

HTH,
Edward

Add NT Service support to existing MFC GUI App

farzadb8-Apr-04 9:46

farzadb

8-Apr-04 9:46

Hi everyone.

I have an existing MFC based GUI Windows application to which I would like to add functionality so it can also run as a Service.

I have good understand of how a Service works and I've written one from scratch but I'm stumped on how I can convert an existing MFC based GUI app to run as a Service. The problem is how to do all the required MFC initialization when the SCM calls my app.

My first thought was to implment the startup code myself and simply handle a command line arg to determine if I should run as a Service or not. I can then intercept the startup before InitInstance() is called and my GUI is displayed. Of course I would implement the required Service methods such as 'ServiceMain' and 'ServiceControlHandler' then based on the command line arg I would hand of startup control to these methods and away I go to running a Service.

Then I looked at how much MFC is doing before it calls InitInstance() on my app and realized writing my own 'WinMain' isn't going to be trivial.

So basically I'm looking for advice on how to handle this. I could just write a standalone Service based on this app but I would love to just have one module which is dual purpose.

In writing this I just had a thought. Shouldn't I just determine if I'm running as a service or not in InitInstance() and go from there? Maybe that's the solution but I've typed this all out so I might as well post it. Smile | :)

Re: Add NT Service support to existing MFC GUI App

Hashim Saleem8-Apr-04 14:27

Hashim Saleem

8-Apr-04 14:27

although I may not be perfect but I think services are background processes that run in the background without any user intervention.

I developed a service which was a router. As you can understand routers are suitable for these kind fo applicaton (service) who once need to be configured and then they play their role quitely in the background i.e. routing.

Well, to configure that router, I made another MFC GUI application. This application is launched from a user (normally System Administrator) to configure the router. Administrator configures the router by using this GUI tool and the closes it and once again router starts its work according to new settings.

I dont think of any GUI application as a candidate to be a service. I dont even see any windows service implemented in this way.

Think on your application whether it is a candidate to become a service!!!

Re: Add NT Service support to existing MFC GUI App

farzadb11-Apr-04 19:33

farzadb

11-Apr-04 19:33

Thanks for the tip hashimsaleem.

Well as I said at the end of my post I figured out what I needed to do by the time I finished posting my question. Basically I wrote all the Service functionality and just made my app run as Service or instantiate the Dialog (or main window) depending on how it was started. It was pretty simple.

easy_odbc compile problem

intrinsic8-Apr-04 9:32

intrinsic

8-Apr-04 9:32

I am trying to use easy_odbc. I have copied the .h and .cpp files into my project directory and added them to the MS C++ project as source and header files.

When I compile I get the following message

Compiling...
easy_odbc.cpp
c:\program files\c technologies\c-pen sdk\cwin\samples\tutorial_1_vc\easy_odbc.cpp(306) : fatal error C1010: unexpected end of file while looking for precompiled header directive
Error executing cl.exe.

Does anyone have any ideas?

Thanks

Glen

Re: easy_odbc compile problem

Mike Dimmick9-Apr-04 0:26

Mike Dimmick

9-Apr-04 0:26

In Project > Settings, select the files for easy_odbc in the tree, go to the C++ tab, the Precompiled Headers category, and choose the 'Not using precompiled headers' radio button.

Stability. What an interesting concept. -- Chris Maunder

Re: easy_odbc compile problem

intrinsic9-Apr-04 2:47

intrinsic

9-Apr-04 2:47

Thanks for the advice. I tried it straigth away and here is the result

Compiling...
easy_odbc.cpp
Linking...
CWinAPITutorial1Dlg.obj : error LNK2001: unresolved external symbol _SQLFreeEnv@4
CWinAPITutorial1Dlg.obj : error LNK2001: unresolved external symbol _SQLFreeConnect@4
CWinAPITutorial1Dlg.obj : error LNK2001: unresolved external symbol _SQLDisconnect@4
CWinAPITutorial1Dlg.obj : error LNK2001: unresolved external symbol _SQLFreeStmt@8
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLFreeStmt@8
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLAllocStmt@8
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLConnect@28
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLAllocConnect@8
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLAllocEnv@4
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLRowCount@8
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLExecute@4
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLPrepare@12
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLExecDirect@12
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLSetStmtAttr@16
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLEndTran@12
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLGetDiagRec@32
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLDescribeCol@36
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLNumResultCols@8
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLFetchScroll@12
easy_odbc.obj : error LNK2001: unresolved external symbol _SQLBindCol@24
Debug/CWinAPITutorial1.exe : fatal error LNK1120: 19 unresolved externals
Error executing link.exe.

Can anyone give me some additional advice on solving these link errors?

Thanks

Glen

Re: easy_odbc compile problem

intrinsic9-Apr-04 3:06

intrinsic

9-Apr-04 3:06

I was able to resolve this issue by adding the following the object/library modules in the link/general tab of my project settings

Thanks for all the assistance

Glen

kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib

Re: easy_odbc compile problem

Mike Dimmick9-Apr-04 5:50

Mike Dimmick

9-Apr-04 5:50

I was going to say, add odbc32.lib to your link settings. Adding all the others are unlikely to do any harm, but will increase your build time slightly.

Stability. What an interesting concept. -- Chris Maunder

operator overloading

Guido Loupias8-Apr-04 8:20

Guido Loupias

8-Apr-04 8:20

can you overload the same operator? For example:

<br />
void operator = (char* arg_cDate);<br />
void operator = (CDate arg_cdDate);<br />

Re: operator overloading

Renjith Ramachandran8-Apr-04 8:28

Renjith Ramachandran

8-Apr-04 8:28

i think as Unary and binary. not in the same

More n' More

Re: operator overloading

toxcct8-Apr-04 9:23

toxcct

8-Apr-04 9:23

of course you can, but only in C++

But what is troubling in your code lines, is that you overload an "=" operator, but it doesn't return anything, so, if the parameter is the value you want to assign to another, where is the destination ??
Are these operator inside classes definitions?

is this better ?

<font style="color:blue;">void operator</font> = (<font style="color:blue;">void</font>* DestObject, <font style="color:blue;">char</font>* arg_cDate);     <font style="color:green;">//Global function</font>
<font style="color:blue;">CDate& CDate::operator</font> = (CDate arg_cdDate);             <font style="color:green;">//Member function</font>

for the last one, i would even prefered that synopsis :

<font style="color:blue;">CDate& CDate::operator</font> = (<font style="color:blue;">const</font> CDate& refDate);        <font style="color:green;">//CDate member function</font>

what do you think about this ?

TOXCCT >>> GEII power

Re: operator overloading

Guido Loupias8-Apr-04 9:50

Guido Loupias

8-Apr-04 9:50

You're right, I am so n000b OMG | :OMG:

(thanks!!

)

file problem

kfaday8-Apr-04 7:12

kfaday

8-Apr-04 7:12

what am i doing wrong?
i open a file in a function and i can't see it in main. thanks for your help!

<br />
int main (void)<br />
{<br />
 FILE *archc=NULL;<br />
<br />
 load (archc);<br />
<br />
<br />
 fprintf (archc,"hello");  //can't write<br />
 fclose(archc); //can't close as well<br />
<br />
return 0;<br />
}<br />
<br />
void load (FILE *archc)<br />
{<br />
 archc = fopen("simple.c","r+")<br />
}<br />

Re: file problem

Prakash Nadar8-Apr-04 7:31

Prakash Nadar

8-Apr-04 7:31

Try this

int main (void)
{
FILE *archc=NULL;

load (archc);

fprintf (archc,"hello"); //can't write
fclose(archc); //can't close as well

return 0;
}

void load (FILE *&archc)
{
archc = fopen("simple.c","r+")
}

MSN Messenger.
prakashnadar@msn.com

"If history isn't good, just burn it." - Sidhuism.

Re: file problem

kfaday8-Apr-04 7:54

kfaday

8-Apr-04 7:54

thanks!!
problem solved

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