Re: Need Map to Database Ideas - C / C++ / MFC Discussion Boards

mike-o23-Jun-04 12:37

23-Jun-04 12:37

Hi,

I'm working on a frontend to an old dos program, and am at the point where i need to interact with the backend.

I was planning on using the System() call, but was wondering if there's a better way to interface with other programs. For instance, i'd like to know if the backend dos program is still running, or if the program has crashed.

Does VC++ provide a method to do this?

Thanks,

Mike

"I bet Einstein turned himself all sorts of colors before he invented the light bulb." -- Homer J.

Re: A better System( ... ) call?

Johan Rosengren23-Jun-04 21:32

Johan Rosengren

23-Jun-04 21:32

Here is an example nicked from MSDN:

#include <windows.h>
#include <stdio.h>
#define MAXNAMELEN    255
#define CMDLINE        "/c dir"
#define IMAGENAME      "\\nt\\bin\\cmd.exe"
#define WINTITLE       "CreateProcess DEMO"

main(){
BOOL    fSuccess,fExit;
DWORD    dwExitCode,dw;
STARTUPINFO    SI;
PROCESS_INFORMATION    pi;
HANDLE     hProcess,hThread;
SI.cb =sizeof(STARTUPINFO); SI.lpReserved = NULL;SI.lpDesktop=NULL;
SI.lpTitle="CreateProcess DEMO";SI.cbReserved2=0;SI.lpReserved2=NULL;
fSuccess = CreateProcess((LPTSTR)IMAGENAME, (LPTSTR)CMDLINE,
           (LPSECURITY_ATTRIBUTES)NULL, 
           (LPSECURITY_ATTRIBUTES)NULL,
           (BOOL)TRUE,(DWORD)0,NULL,NULL,
           (LPSTARTUPINFO)&SI,(LPPROCESS_INFORMATION)&pi); 
if (fSuccess) {  
    hProcess = pi.hProcess;    hThread = pi.hThread;
    printf("Process Id = %d\nThread Id = %d\n",pi.dwProcessId,pi.dwThreadId);
    dw = WaitForSingleObject(hProcess, INFINITE) ;
    if (dw != 0xFFFFFFFF) { /* if we saw success ... */
        /* pick up an exit code for the process */
        fExit = GetExitCodeProcess(hProcess, &dwExitCode) ;
    }
    /* close the process and thread object handles */
    CloseHandle(hThread) ;    CloseHandle(hProcess) ;
    printf("COMPLETED!\n");
}
else    printf("Failed to CreateProcess\n"); 

}

The same method can be used in a GUI-app as well.

Re: A better System( ... ) call?

mike-o24-Jun-04 5:29

mike-o

24-Jun-04 5:29

perfect. thanks a million. Big Grin | :-D

Mike

"I bet Einstein turned himself all sorts of colors before he invented the light bulb." -- Homer J.

Interpreting strings as packed binary data

NizZy23-Jun-04 12:18

NizZy

23-Jun-04 12:18

Hey, I'm having a problem figuring out how to interpret strings as packed binary data in C++ like you can in Python (see http://www.python.org/doc/current/lib/module-struct.html)

I'm not sure how to go about this, but I need to get the file size and checksum from a file to be able to read separate files from a file package (I'm designing an extractor for it).

This is how you do it in python:
(size,chksum) = unpack(">ii", size_chksum)

size_chksum is 8 bits, the first 4 being the size, and the second 4 being the checksum, it splits it into the variables size and chksum.

This is what one person told me to do in C++, where size is the 4 bits (checksum not used here):
size_int = size[3] << 8 | size[2] << 16 | size[1] << 24 | size[0];

Anyone got an idea???

-NizZy

Re: Interpreting strings as packed binary data

NizZy23-Jun-04 12:28

NizZy

23-Jun-04 12:28

LOL

I meant bytes, not bits!

hehe

named pipe problem

pnpfriend23-Jun-04 11:20

pnpfriend

23-Jun-04 11:20

Hello All, I'm writing client/server programs using named pipe.
In the server program,
when the user click on a button, it create a thread. Inside a thread function, CreatePipe is called first then listen to client.

Here the code how server program creates the pipe and the thread function

<br />
UINT theThreadFunction(LPVOID lParam)<br />
{<br />
 ServerApp *s = (ServerApp*)lParam;<br />
 s->CreatePipe();<br />
while(!stop)<br />
{<br />
 s->CommunicateWithClient();<br />
}<br />
}<br />
<br />
void ServerApp::CreatePipe()<br />
{<br />
CString temp = "\\\\.\\pipe\\Server";	<br />
LPCTSTR lpszPipename = (const char*) temp;<br />
<br />
 hPipe = CreateNamedPipe( <br />
	   lpszPipename,             // pipe name <br />
	   PIPE_ACCESS_DUPLEX,       // read/write access <br />
	   PIPE_TYPE_MESSAGE |       // message type pipe <br />
	   PIPE_READMODE_MESSAGE |   // message-read mode <br />
	   PIPE_WAIT,                // blocking mode <br />
	   PIPE_UNLIMITED_INSTANCES, // max. instances  <br />
	   BUFSIZE,                  // output buffer size <br />
	   BUFSIZE,                  // input buffer size <br />
	   NMPWAIT_USE_DEFAULT_WAIT, // client time-out <br />
	   NULL);                    // no security attribute <br />
if (hPipe == INVALID_HANDLE_VALUE) <br />
   {<br />
	   MessageBox("CreatePipe failed"); <br />
	   enableDlgItems = true;		   <br />
	   return ;<br />
   }  <br />
}<br />
<br />
void ServerApp::CommunicateWithClient()<br />
{<br />
  ...<br />
  bool fConnected = ConnectNamedPipe(hPipe, NULL);// ? TRUE : (GetLastError() == ERROR_PIPE_CONNECTED); <br />
...<br />
}<br />

The client application get executed before the Server Application gets executed.
The client used the following code.

<br />
bool ClientApp::ConnectToServer( HANDLE &hPipe)<br />
{<br />
 LPCTSTR lpszPipename = "\\\\serverComputerName\\pipe\\Server";<br />
	bool connected = false;<br />
       hPipe = CreateFile( <br />
         lpszPipename,   // pipe name <br />
         GENERIC_READ |  // read and write access <br />
         GENERIC_WRITE, <br />
         0,              // no sharing <br />
         NULL,           // no security attributes<br />
        OPEN_EXISTING,  // opens existing pipe <br />
         0,              // default attributes <br />
         NULL);          // no template file <br />
if (hPipe != INVALID_HANDLE_VALUE) <br />
	  {<br />
		 connected = true;<br />
         break; <br />
	  }<br />
return connected;<br />
 }<br />

Here the problem, the ServerApp CreateNamedPipe() and then called ConnectNamedPipe(). If there isn't a client connect to the same pipe, the ConnectNamedPipe() waits until a client get connected.

The client Application called CreateFile() to connect to the pipe the server opened,
and return was return connected = true. However in the ServerApp, ConnectNamedPipe() is still waiting for the client to connnect.

Why the ServerApp stills think there isn't a client connecting to the pipe even though the CreateFile() in the ClientApp is successfully connected to named pipe?

Thank you

Need Map to Database Ideas

macbeth7623-Jun-04 10:20

macbeth76

23-Jun-04 10:20

I have an up coming project where I need to scan a map and link part of the map to a database. I am c++ and c# programmer. If there is any techology out there that is related I would like to know. I don't want to reinvent something.

Re: Need Map to Database Ideas

Anthony_Yio23-Jun-04 16:38

Anthony_Yio

23-Jun-04 16:38

GIS Database design?

http://www.clr.utoronto.ca/VIRTUALLIB/KBASE/gis_db.html[^]

Sonork 100.41263:Anthony_Yio

Changing fontcolor

Wim Summer23-Jun-04 9:42

Wim Summer

23-Jun-04 9:42

Hi.

A simple question.

How could I change the fontcolor of a static control or edit box or button, etc.

For example: if I have the static control with the ID -> IDC_STATIC, what should write in InitDialog to change the fontcolor to green?.

Thank you very much.

Re: Changing fontcolor

bneacetp23-Jun-04 10:04

bneacetp

23-Jun-04 10:04

Wim Summer wrote:
How could I change the fontcolor of a static control or edit box or button, etc.

Handle the WM_CTLCOLOR message of your dialog box.

Try something along the lines of:

HBRUSH CMyDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
	HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

	// TODO:  Change any attributes of the DC here
<code>	if(pWnd->GetDlgCtrlID() == IDC_STATIC)
	{
		pDC->SetTextColor(RGB(0,128,0));
	}</code>

	// TODO:  Return a different brush if the default is not desired
	return hbr;
}

Happy Programming and God Bless!

"Your coding practices might be buggy, but your code is always right."

Internet::WWW::CodeProject::bneacetp

Changing the fontcolor.

Wim Summer23-Jun-04 9:37

Wim Summer

23-Jun-04 9:37

Hi.

A simple question.

How could I change the fontcolor of a static control or edit box or button, etc.

For example: if I have the static control with the ID -> IDC_STATIC what should write in InitDialog to change the fontcolor.

Thank you very much.

Re: Changing the fontcolor.

User 58385223-Jun-04 19:11

User 583852

23-Jun-04 19:11

you need to override the CWnd::OnCtlColor function in the parent window

you will need something like this

HBRUSH MyDialog::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor )
{
HBRUSH aBrush = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

if(pWnd->GetDlgCtrlID() == IDC_STATIC)
pDC->SetTextColor(RGB(255,0,0)); //red for example

return aBrush;
}

Problems with Bitmaps

Member 114074823-Jun-04 9:29

Member 1140748

23-Jun-04 9:29

I am using Visual C++ 6.0 and I have problems using CBitmap.
Sometimes when I use the function

MyBitmap.LoadBitmap( IDB_BITMAP );

a debug assertion occurs:

File: wingdi.cpp
Line: 1120

The Bitmaps (256 colors, 8 Bit) were created in Photoshop. Paradoxically this assertion failure does not occur during the use of all bitmaps, only when I try to load some of them. I replaced the Bitmaps that did not work with new ones, changed the order of the bitmaps to load and deleted the debug folder, but nothing changed.

Is there any resolution for this problem? Confused | :confused:

Thank you for you help,
R.

Re: Problems with Bitmaps

PJ Arends23-Jun-04 10:21

PJ Arends

23-Jun-04 10:21

Line 1120 of wingdi.h is

ASSERT(m_hObject == NULL);

That means you are trying to load a second bitmap into a CBitmap object. You have to detach and delete the existing image before you can load a new one.

DeleteObject(MyBitmap.Detach());
MyBitmap.LoadBitmap(IDB_BITMAP);

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: Problems with Bitmaps

Member 114074823-Jun-04 11:06

Member 1140748

23-Jun-04 11:06

ok, that was the point!

Thank you,
R.

LPDISPATCH help me

Nitro_gen23-Jun-04 9:16

Nitro_gen

23-Jun-04 9:16

Everybody knows the Microsoft forms 2.0 image control. I'm getting nuts with this.
I need to set the image file dynamically...but look at this.

m_imagecontrol.SetPicture(LPDISPATCH newValue);

I have a file dialog to browse the image, the question is:

how can I set the CFileDialog.GetFilename() in m_imagecontrol.SetPicture(LPDISPATCH newValue);

CFileDialog.GetFilename() is a CString, if there's a function to do this, please tell me before I kill myself.

thanks in advance pals

Re: LPDISPATCH help me

Anthony_Yio23-Jun-04 16:33

Anthony_Yio

23-Jun-04 16:33

Try to look for IPicture usage. I think the LPDISPATCH param is a IPicture interface.

(rough guess)

Sonork 100.41263:Anthony_Yio

Setting a Custom Background for the Main Menu Bar

Steve Thresher23-Jun-04 9:13

Steve Thresher

23-Jun-04 9:13

I'm attempting to add a gradient background to my applications main menu bar
to match what I've done to the toolbars. I've got as far as creating a
pattern brush from a bitmap and setting it as the menus background using
SetMenuInfo() but it is not being rendered correctly. The colour should go
from dark at the top to light at the bottom but what I've ended up with is
the darker half at the bottom going from dark to light and the lighter half
at the top going from dark to light. Its as if the origin for the brush has
negative coordinates. Can anybody suggest how to correct the origin of the
brush?

Systems AXIS Ltd - Software for Business ...

Want help in learning Unicode Usage

Member 119592223-Jun-04 8:53

Member 1195922

23-Jun-04 8:53

Hi 2 all,
It is nice to be a member of this good site.Its veryh good site because its help in solvin out the queries and the problem faced by us.So know i should discuss my problem with u guys.

As i m a student of Undergrad and got a project in VC++.Our peoject is about Confused | :confused:

multiLingual Translator.The basic objective is to take an input from the user and then translate it to someother language.So this is only done by Unicode. Since i donot have any exposure to Unicode Unsure | :~

so i want ur help.How should this be carried out D'Oh! | :doh:

.I dont know how to store Unicode in Database ? Eek! | :eek:

So anybody who knows this solution please contace me on my Yahoo id i.e luckylaeeq4u@yahoo.com. Thanx for reading my problem Poke tongue | ;-P

. Hope some positive response from you Guys.
Bye and Take Care.
Wink | ;)

Laeeq Ahmad.
Pakistan

String formatting question

Nick Parker23-Jun-04 8:49

Nick Parker

23-Jun-04 8:49

I want to do something like this, however wsprintf throws a compiler error. Is there another format function that I should use instead to do this?

BSTR path = NULL;
int num = 1;
path = SysAllocString(L"//errors/error[@id='%i']");
wsprintf(path, num);

- Nick Parker
My Blog | My Articles

Re: String formatting question

palbano23-Jun-04 8:59

palbano

23-Jun-04 8:59

int wsprintf(          LPTSTR lpOut,
    LPCTSTR lpFmt,
     ...
);

Nick Parker wrote:
BSTR path = NULL;

BSTR != LPCTSTR (wrong type)

int num = 1;
wsprintf(_T("//errors/error[@id='%i']");, num);

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: String formatting question

Nick Parker23-Jun-04 9:17

Nick Parker

23-Jun-04 9:17

palbano wrote:
BSTR != LPCTSTR (wrong type)

I realize that. I need to use a BSTR for the rest of what I am working on. Any other suggestions?

- Nick Parker
My Blog | My Articles

Re: String formatting question

PJ Arends23-Jun-04 10:34

PJ Arends

23-Jun-04 10:34

Do all formatting using LPTSTRs, then use the T2BSTR conversion macro to get your BSTR type.

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: String formatting question

cmk23-Jun-04 10:28

cmk

23-Jun-04 10:28

Ummm, there is a problem ...

Aside from the BSTR != wchar_t*, what do you expect wsprintf to do ?
I mean it's used to take a format string (path) and create a result - you haven't specified a result string. Are you expecting it to modify path in place (it won't even with correct types) ?

From MSDN :
typedef OLECHAR * BSTR;
These strings are zero-terminated, and in most cases they can be treated just like OLECHAR* strings. However, you can query a BSTR for its length rather than scan it, so it can contain embedded null characters. The length is stored as a 32-bit integer at the memory location preceding the data in the string.

The 32-bit is placed before the BSTR value so you don't need to worry about it, just cast the BSTR to a wchar_t*.

e.g. (without error checking)
wchar_t res[500];
BSTR path = NULL;
int num = 1;
path = SysAllocString(L"//errors/error[@id='%i']");
wsprintf(res, (wchar_t*)path, num);

...cmk

Save the whales - collect the whole set

Re: String formatting question

Michael Dunn23-Jun-04 13:57

Michael Dunn

23-Jun-04 13:57

You're misusing the BSTR. wsprintf() prints into a TCHAR array, but a BSTR is not an array.

BSTR path = NULL;
CString s;
int num = 1;
  
  s.Format ( _T("//errors/error[@id='%i']"), num );
  path = s.AllocSysString();

If you can't/don't want to use CString, alloc a TCHAR buffer instead and make sure it's big enough, then use the T2BSTR conversion macro to convert it to a BSTR.

Check out this article[^] if you need more details on converting between string types.

--Mike--
Personal stuff:: Ericahist | Homepage
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----
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