C / C++ / MFC Discussion Boards

Re: Showing a list of files ina ListControl

Ravi Bhavnani9-Feb-05 18:49

9-Feb-05 18:49

See CFileFind[^] and CFile::GetStatus()[^].

/ravi

My new year's resolution: 2048 x 1536
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serial communication in a thread

Anonymous9-Feb-05 18:25

Anonymous

9-Feb-05 18:25

Hi, I'm trying to communicate with a device via COM1, I've done it before(a few years ago) but now that I have very little time to do that I encounter many problems. first I'm using createfile and readfile in overlapped mode in an exclusive thread, because received data needs to be processed in the main thread. communication speed is about 100-200 bytes/sec, I've used getcomm and setcomm to setup com1 in 9600bps.
first problem(minor): because an interpreter reads data
and looks for a sync frame. when i first run my prog it can't find the frame but when I check the received data first with a binary termial to make sure that received data is ok(I set binary terminal to 9600bps) and after that I run the prog the prog works ok, so I think there is a problem with my DCB structure so that COM1 is not in the appropriate mode when I first run the prog. I think I can solve this soon but the major problem that really makes life difficult for me is this:
second problem(major): there is a problem with the thread so when I want to debug the prog and set break points SOMETIMES the whole system(win XP)hangs and I have to restart computer( that's why I couldn't solve first problem yet).
this sometimes deponds on where i've set the break point, when I terminate the thread before breakpoint everything is ok. I start thread with AfxBeginThread and I don't set priority so it is supposed to have the same priority level as the calling process( that shouldn't be a problem). I close handles and terminate the thread before exiting but the problem shouldn't be that handle leakage or something like that because when I restart and run the prog first time problem persists. any suggestion or recommandation is highly appreciated. thanks

Re: serial communication in a thread

Giannakakis Kostas9-Feb-05 19:13

Giannakakis Kostas

9-Feb-05 19:13

You can find many articles in Code Project with serial communication libraries, you could simply use one of them.

Regarding the second problem, do not enable breakpoints in the thread before it is started. In that case the system doesn't hang, it just takes the debugger an awful long time to start.

Disable print screen/sysRq key on keyboard

Member 57475129-Feb-05 16:58

Member 5747512

9-Feb-05 16:58

hi all,
I m working on in VC++ 6.0 on windows XP platform.
I want to disable the print screen on the keyboard wherever my application starts and enable it whenever application exit.can anyone help me out.

regards,
kapil kant

Re: Disable print screen/sysRq key on keyboard

RicoH11-Feb-05 0:38

RicoH

11-Feb-05 0:38

you should check out the SetWindowsHookEx[^] function which is supported on WinNT, 2000 and XP.
This will let you set a low-level keyboard hook.
There is an article[^] on MSDN which describes the use of a low-level hook.

Enjoy!

Don't think you are, know you are...

ShellExecute, Here is my code

Aqueel9-Feb-05 16:25

Aqueel

9-Feb-05 16:25

void CPrintDlg::OnBPrint()
{
ShellExecute(NULL, "print", "c:\\Print\\myfile.doc", NULL, NULL, 0);
}

We Believe in Excellence

Re: ShellExecute, Here is my code

Ryan Binns9-Feb-05 17:26

Ryan Binns

9-Feb-05 17:26

Uhh yeah... and your question is...?

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Access to its caller from a Dialog

jazzkiller9-Feb-05 14:48

jazzkiller

9-Feb-05 14:48

Hi all,
Inside a View class (CChildView), I call CDialog. The Dialog pops up. Now, how can I talk to the CChildView while the Dialog still shows?

Say CChildView display a bitmap; in my dialog, I change the zoom parameter to 2x, I want the image to reflex the change immediately in the CChildView.

Thank you in advance,

Re: Access to its caller from a Dialog

KaЯl10-Feb-05 5:40

KaЯl

10-Feb-05 5:40

What about defining an user message (WM_APP + something) and post it/ send it from the dialog to the view?

Fold With Us!
What a sad world it would be if everyone said and did only what was easy - Shog⁹

Re: Access to its caller from a Dialog

jazzkiller17-Feb-05 5:35

jazzkiller

17-Feb-05 5:35

Do I define WM_APP message in View and from Dialog I do: this->SendMessage(WM_DO_STUFF,0,0)?

I did that, but it didn't work out.

Thanks

Re: Access to its caller from a Dialog

KaЯl17-Feb-05 22:54

KaЯl

17-Feb-05 22:54

* Is your dialog modal or modeless?
* Try to use PostMessage instead of SendMessage

you should have in <myapplication.h>:
#define WM_DO_STUFF WM_APP+1

In <myview.h>

<br />
BEGIN_MESSAGE_MAP(CMyView, CView)<br />
[...].br />
afx_msg LRESULT OnDoStuff(WPARAM wParam, LPARAM lParam);<br />
END_MESSAGE_MAP()<br />

In <myview.cpp>

<br />
BEGIN_MESSAGE_MAP(CMyView, CView)<br />
[...].br />
ON_MESSAGE(WM_DO_STUFF, OnDoStuff)<br />
END_MESSAGE_MAP()<br />
<br />
LRESULT CMyView::OnDoStuff(WPARAM wParam, LPARAM lParam)<br />
{<br />
// do stuff<br />
return 0L;<br />
}<br />

in <mydialog.cpp> (CMyDialog must know about the view)

<br />
void CMyDialog::OnActionButton()<br />
{<br />
   ASSERT(m_pMyView);<br />
   m_pMyView->PostMessage(WM_DO_STUFF);<br />
}<br />

HTH,

Fold With Us!
What a sad world it would be if everyone said and did only what was easy - Shog⁹

Re: Access to its caller from a Dialog

jazzkiller18-Feb-05 4:46

jazzkiller

18-Feb-05 4:46

Thank you K,
I finally passed a pointer of MyView to Dialog and access functions in MyView such as Invalidate and other member functions through this pointer.

Thanks,

Re: Access to its caller from a Dialog

jazzkiller18-Feb-05 4:52

jazzkiller

18-Feb-05 4:52

Hi K,
I finally passed a MyView pointer to CDialog through constructor. Thus, I can access MyView member functions from CDialog. However, when I clicked OK on the Dialog, the program crashed. My guess is that I don't know how to delete the *pView that I passed to Dialog. I delete it in the contructor Dialog destructor). Any thought?

By the way, it is a Modal dialog.

Thanks,

Accessing remote registry in different domain

Member 17212159-Feb-05 13:38

Member 1721215

9-Feb-05 13:38

Hi,

I have 2 win2003 servers which are in different domain say domain1 and domain2. The domains are under a forest with proper trust relationships established. I need to access registry of server in domain2 from an application on machine in domain1. I have set appropriate access permissions and allowed paths as mentioned below.

1. domain2 server - HKLM\SYSTEM\CurrentControlSet\Control\SecurePipeServers\winreg\AllowedPaths - contains registry key to be allowed access
2. domain2 server - Granted full permissions to everyone to actual registry key

With this I am not able to connect to remote registry using "RegConnectRegistry" API. Is cross domain registry access allowed in windows? If so what additional settings needs to be done?

Thanks
JA

Re: Accessing remote registry in different domain

2249179-Feb-05 23:26

224917

9-Feb-05 23:26

Are you able to logon to IPC$ of the server of which you want to access the registry ?

suhredayan
There is no spoon.

Re: Accessing remote registry in different domain

Member 172121510-Feb-05 14:05

Member 1721215

10-Feb-05 14:05

i am able to log to ipc. I am also able to connect to remote registry but it remains in read-only mode.

if tried to connect using regconnectregistry api, it fails. do i need to specify any trust relationships or forest levels for this to be working?

Polygon replacement.

Anthony98879-Feb-05 13:37

Anthony9887

9-Feb-05 13:37

Hi,
I'm trying to recreate the Polygon API with filling. I'm using Polyline. Is there a filling algorithm I can use to do the exact same thing that Polygon does?

Thanks

Re: Polygon replacement.

John R. Shaw10-Feb-05 10:15

John R. Shaw

10-Feb-05 10:15

Books:
Michael Abrash Graphics Programming. (best choice)
Foiley and Van Dam. (lots of info.)
Graphics Gems. (may be)

You should be able to find an implimentaion at a graphics or gaming sight.

http://sourceforge.net (a good place to look for libraries and applications.)

If you search for "Michael Abrash" or "Foiley and Van Dam" you should find some hits.

Well I hope that helps narrows the search.

Good luck!

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Shell Extensions and ShellExecuteEx

MasamuneXGP9-Feb-05 12:57

MasamuneXGP

9-Feb-05 12:57

I'm currently developing a context menu shell extension. I'm trying to create something similar to the Windows Picture and Fax viewer in that it is the default action for the specified filetype. Google assisted me in finding the MayChangeDefaultMenu registry tweak, so doubleclicking a hooked file fires my extension, however, when a file is executed with ShellExecute/Ex, it isn't. Is there a way to set my extension as the *official* default action so that ShellExecute/Ex will fire my extension?

One method I can think of doing would be to register a normal file command via and set that as the default, then somehow make that command's menu entry invisible so that it exists only for the purpose of being the default action. Possible?

Any other suggestions are welcome of course...

Should be simple: CFile Dialog filters

JKallen9-Feb-05 12:56

JKallen

9-Feb-05 12:56

When I create an application. Do the files my app uses (such as files the user can load) have to have an extension of only 3 characters? If so, how do I determine what extensions are already in use to ensure that my extensions are unique and have their own icon?

Re: Should be simple: CFile Dialog filters

C^hris L^osinger10-Feb-05 3:58

C^hris L^osinger

10-Feb-05 3:58

JKallen wrote:
Do the files my app uses (such as files the user can load) have to have an extension of only 3 characters?

three is typical, but you can have extensions of any length you like. ex: .JS, .CONFIG, .FOO.

JKallen wrote:
If so, how do I determine what extensions are already in use to ensure that my extensions are unique and have their own icon?

strictly speaking, you can't. nobody keeps an authoratative list of file extensions. the best you can do is search the web (and your system registry) to see if you can find a match.

Image Toolkits | Image Processing | Cleek

Re: Should be simple: CFile Dialog filters

JKallen11-Feb-05 11:42

JKallen

11-Feb-05 11:42

Thanks. that's what i figured. How do I have the OS associate an extenion with an icon? Secondly what happens if the extension already exists on the PC via installation of another app?

project path

chints819-Feb-05 11:45

chints81

9-Feb-05 11:45

hi,
if you guys could tell me how do i get the project path or the handle tht hold it . it would be gr8.
thanks for the help

Chintan

Re: project path

2249179-Feb-05 16:47

224917

9-Feb-05 16:47

Are you looking to get the path of you exe? If so, use getmodulefilename().

suhredayan
There is no spoon.

Winsock Connect() Problems

manofoblivion9-Feb-05 11:33

manofoblivion

9-Feb-05 11:33

I cannot create a working connection. I need help. Here is my source:

#include <winsock.h>
#include <string>
#include <sstream>
#include <iostream>

using namespace std;

string itos(int x){
ostringstream sStream;
sStream<<x<<flush;
return(sstream.str());
}

int="" main(int="" argc,="" char="" *argv[]){
="" fills="" array="" with="" ips
="" string="" iparray[255];
="" subnetarray[1]="192.168.1" ;
="" int="" rangestart,rangeend;
="" rangestart="5;
" rangeend="5;
" index="0;
" for(int="" x="rangeStart;x<=rangeEnd;x++){
" iparray[index]="subnetArray[0]+".";
" tmp="itos(x);
" iparray[index]+="tmp;
" index++;
="" }
="" wsa="" startup
="" wsadata="" wsadata;
="" if(wsastartup(makeword(1,1),&wsadata)!="0){
" cout<<"wsastartup="" failed!\n";
="" system("pause");
="" return="" exit_success;
=""
="" socketdescriptor;
="" socketdescriptor="socket(AF_INET,SOCK_STREAM,0);
" if(socketdescriptor<0){
="" cout<<"socket="" creation="" serverport="20100;
" struct="" hostent="" *hostinfo;
="" sockaddr_in="" serveraddress;
="" ip[20];
="" strcpy(&ip[0],iparray[index].c_str());
="" cout<<ip;
="" hostinfo="gethostbyname(IP);
" serveraddress.sin_family="hostInfo-">h_addrtype;
memcpy((char *)&serverAddress.sin_addr.s_addr,hostInfo->h_addr_list[0],hostInfo->h_length);
serverAddress.sin_port=htons(serverPort);
//cout<<endl<<endl<<serveraddress.sin_addr.s_addr;
if(connect(socketdescriptor,(struct="" sockaddr*)&serveraddress,sizeof(struct="" sockaddr))="=-1){
" cout<<"="" not="" connected"<<endl;
="" }
="" else{
=""

="" system("pause");
="" return="" exit_success;
}

and="" the="" other:

#include="" <winsock.h="">
#include <iostream>

using namespace std;

int main(int argc, char *argv[]){

//wsa startup
WSADATA wsaData;
if(WSAStartup(MAKEWORD(1,1),&wsaData)!=0){
cout<<"WSAStartup failed!\n";
system("PAUSE");
return EXIT_SUCCESS;
}

int socketDescriptor;
socketDescriptor=socket(AF_INET,SOCK_STREAM,0);
if(socketDescriptor<0){
cout<<"Socket creation failed!\n";
system("PAUSE");
return EXIT_SUCCESS;
}
struct sockaddr_in myAddr;
myAddr.sin_family=AF_INET;
int serverPort=420100;
myAddr.sin_port=htons(serverPort);

char myIP[16];
gethostname(myIP,16);
myAddr.sin_addr.s_addr=inet_addr(myIP);
cout<<myip<<endl;

="" struct="" hostent="" *h;
="" h="gethostbyname(myIP);
" cout<<"hostname:="" "<<h-="">h_name<<endl;
cout<<"ip:="" "<<inet_ntoa(*((struct="" in_addr*)h-="">h_addr))<

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