C / C++ / MFC Discussion Boards

Re: List Box

gamitech6-Mar-06 2:12

gamitech

6-Mar-06 2:12

ShowWindow(GetDlgItem(hdlg,IDC_LIST1),SW_HIDE);

gabby

How to create Web Setup package

mahammadhusen6-Mar-06 1:10

mahammadhusen

6-Mar-06 1:10

I am created a software in asp.net 2005 and i want to create a setup for instalation can any one help me

Mahammadhusen

Changing the color of dialog box

Aryan S6-Mar-06 1:06

Aryan S

6-Mar-06 1:06

I want to change the color of the dialog box in MFC application.
Can you please tell me how can it be possible.
Thanks in advance.

Re: Changing the color of dialog box

Nibu babu thomas6-Mar-06 1:11

Nibu babu thomas

6-Mar-06 1:11

Use WM_CTLCOLOR (OnCtlColor) or WM_ERASEBKGND

Using OnCtlColor

HBRUSH CMyDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) 
{
   <font color=green>// Call the base class implementation first! Otherwise, it may
   // undo what we're trying to accomplish here.</font>
   HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

   <font color=blue>if</font> (CTLCOLOR_DLG == nCtlColor)<font color=green>// Is dialog</font>
   {      
      hbr = ::GetSysColorBrush(1);
   }

   <font color=blue>return</font> hbr;
}

Nibu thomas
Software Developer

Re: Changing the color of dialog box

Aryan S6-Mar-06 1:49

Aryan S

6-Mar-06 1:49

Thanks.
It worked fine.
But now I am facing another problem. I want to change the color of the controls like buttons, static as well.
Can you please suggest a way out.

Re: Changing the color of dialog box

Eytukan6-Mar-06 2:51

Eytukan

6-Mar-06 2:51

CTLCOLOR_BTN

VuNic

Re: Changing the color of dialog box

Hamid_RT6-Mar-06 1:12

Hamid_RT

6-Mar-06 1:12

OnCtlColor

Re: Changing the color of dialog box

Aryan S6-Mar-06 1:46

Aryan S

6-Mar-06 1:46

OnInitColor is working fine.. thanks
But can you please tell me how can i change the color of the Controls like buttons, static etc?

-- modified at 7:56 Monday 6th March, 2006

Re: Changing the color of dialog box

Hamid_RT6-Mar-06 2:52

Hamid_RT

6-Mar-06 2:52

if you want to change color of Buttons
I think first derived class Button

class CMyButton:public CButton
{
then use WM_DRAWITEM
};

void CMyButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
CDC* m_DC = CDC::FromHandle(lpDrawItemStruct->hDC);
...
...
...
}

Re: Changing the color of dialog box

J51219826-Mar-06 1:23

J5121982

6-Mar-06 1:23

place this code below in InitInstance()

SetDialogBkColor(RGB(219,226,242)//set back ground
,RGB(0,0,0));//set foreground

JAYARAJ

Re: Changing the color of dialog box

rajeev826-Mar-06 2:01

rajeev82

6-Mar-06 2:01

add this function in the OnPaint handler and get amazed....

CPaintDC d(this); // device context for painting
CPen p[64];
int i;
CRect r;
GetClientRect(&r);

for(i=0;i<=63;i++)
p[i].CreatePen(PS_ENDCAP_ROUND,1,RGB(0,(i*2),(i*4)));

for(i=0;i

REceive events in serial comms

Trollslayer6-Mar-06 0:55

Trollslayer

6-Mar-06 0:55

I need to write a small automation tool for product testing and we use RS232 for control.
Looking at the serial comms articles here they all seem to need you to scan for received characters rather than having an event and the VC6 sample which has an event uses the MSCOMM ActiveX control which can cause some portability problems for me.
Does anyone know of a method which will give events but doesn't rely on ActiveX?
Thanks.

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Re: REceive events in serial comms

kakan6-Mar-06 1:39

kakan

6-Mar-06 1:39

AFAIK, all serial comms classes are event driven, due to the fact that they are using overlapped IO for the serial port communication. At least for reading the serial port.
Or am I totally wrong here?

Re: REceive events in serial comms

Trollslayer6-Mar-06 1:54

Trollslayer

6-Mar-06 1:54

Serial comms is done as a file operation usually, it is sockets that are event driven (AFAIK).

The tigress is here Big Grin | :-D

Re: REceive events in serial comms

kakan6-Mar-06 2:38

kakan

6-Mar-06 2:38

See the (much more copmplete) answer from Roger Stoltz.
He says it all.

Re: REceive events in serial comms

Roger Stoltz6-Mar-06 1:54

Roger Stoltz

6-Mar-06 1:54

Hi Elaine,

I suggest you forget about MsComm32.ocx and write your own class for serial communications.
If you really want an "event" you can use ::WaitCommEvent().

I've written a lot of applications for serial communications all using the same technique:
overlapped I/O, three threads, two message object queues for each port and one callback for received data.
One sending thread, one receiving thread that are spawned from the main thread when the port is opened with a call to ::CreateFile().
The sending thread waits, ::WaitForMultipleObjects(), for a semaphore released with the same amount as message objects added to the send queue.
The receiving thread issues a ::ReadFile() which usually will return FALSE since I use overlapped I/O and ::GetLastError() will return ERROR_IO_PENDING. The receive thread then waits for the event in the OVERLAPPED struct to be signaled.
Having set the comm timeouts properly with ::SetCommTimeouts() the receive event should be signalled after each data package received. How to set the values for the comm timeouts depends on your requirements. Usually I use '1' for ReadIntervalTimeout and '0' for the rest of the parameters.
When the event is signalled, verify the read operation with ::GetOverlappedResult() and you will also get the number of bytes actually read and copied to the buffer you supplied with the call to ::ReadFile(). You could call a callback function from here, or send a windows message or whatever you like for notification, just remember that this is another thread (especially if you use the callback technique).

When you "close" the port, you have to call ::CancelIo() from each thread that has issued a request to the port driver before calling ::CloseHandle().

It's supposed to be hard, otherwise anybody could do it!

Re: REceive events in serial comms

Trollslayer6-Mar-06 1:57

Trollslayer

6-Mar-06 1:57

Thanks Roger, that is just what I want Smile | :)

Elaine (eternally greatful fluffy tigress)

The tigress is here Big Grin | :-D

please read it is importent

baldha rakesh6-Mar-06 0:47

baldha rakesh

6-Mar-06 0:47

i am trying to made a class which have to drive from 'COleDropTarget'

but on my site installed visual studio does not show this class as base so please tell me what is the reason.

Bankey Khandelwal
Software Engineer

Bankey Khandelwal
Software Engineer

Re: please read it is importent

Christian Graus6-Mar-06 1:03

Christian Graus

6-Mar-06 1:03

You can derive from any class you like. The wizard does not show them all, but you should generally avoid using the wizards, and learn to do it yourself Smile | :)

Christian Graus - Microsoft MVP - C++

problem using NtQuerySystemInformation

gamitech6-Mar-06 0:19

gamitech

6-Mar-06 0:19

So I want to enumerate the processes using NtQuerySystemInformation() native api.
I load it from ntdll.dll
i use the process structure below unlike the one documented by microsoft. but i've seen that others use it too.

typedef struct _SYSTEM_PROCESS_INFORMATION
{
DWORD dNext;
DWORD dThreadCount;
DWORD dReserved01;
DWORD dReserved02;
DWORD dReserved03;
DWORD dReserved04;
DWORD dReserved05;
DWORD dReserved06;
QWORD qCreateTime;
QWORD qUserTime;
QWORD qKernelTime;
UNICODE_STRING usName;
DWORD BasePriority;
DWORD dUniqueProcessId;
DWORD dInheritedFromUniqueProcessId;
DWORD dHandleCount;
DWORD dReserved07;
DWORD dReserved08;
VM_COUNTERS VmCounters;
DWORD dCommitCharge;
SYSTEM_THREAD Threads[1];
} SYSTEM_PROCESS_INFORMATION;

the thing is that when I call it I don't get any error code or null pointers but the structure's members are zeros.
the dNext member is not zero but I can't obtain the next pointer for another system_process_information because i get the invalid pointer error when I try this:

if (ProcessInfo->dNext!=0)
ProcessInfo=(SYSTEM_PROCESS_INFORMATION_DEF *)((ULONG *)ProcessInfo+ProcessInfo->dNext);

And I have another question.
How much space should I allocate for the ProcessInfo structure
i only allocate for one structure
SYSTEM_PROCESS_INFORMATION *ProcessInfo=(SYSTEM_PROCESS_INFORMATION *)malloc(sizeof(SYSTEM_PROCESS_INFORMATION));

or I shouldn't allocate at all. I will obtain a pointer to the structure anyway ?
here is the code I use:

HMODULE ntHinst;

ntHinst=LoadLibraryA(NTDLL);
if (ntHinst==NULL)
{
MessageBoxA(GetDesktopWindow(),"Error loading ntdll\nThe program will now end","ERROR",MB_ICONSTOP);
return 0;
}

_NtQuerySystemInformation=(NTQUERYSYSTEMINFORMATION)GetProcAddress(ntHinst,"NtQuerySystemInformation");
if(!_NtQuerySystemInformation)
{
MessageBoxA(GetDesktopWindow(),"Error obtaining function pointer\nThe program will now terminate","ERROR",MB_ICONSTOP);
return 0;
}

SYSTEM_PROCESS_INFORMATION *ProcessInfo=(SYSTEM_PROCESS_INFORMATION *)malloc(sizeof(SYSTEM_PROCESS_INFORMATION);
if (IsBadReadPtr(ProcessInfo,sizeof(SYSTEM_PROCESS_INFORMATION))||IsBadWritePtr(ProcessInfo,sizeof(SYSTEM_PROCESS_INFORMATION)))
return 0;

_NtQuerySystemInformation(SystemProcessInformation ,(PVOID)ProcessInfo,sizeof(SYSTEM_PROCESS_INFORMATION),&ret);

if (ret==0)
{
MessageBoxA(GetDesktopWindow(),"Function Call Failed: NtQuerySystemInformation\nThe program will now terminate","ERROR",MB_ICONSTOP);
return 0;
}
if(ProcessInfo==NULL)
{
MessageBoxA(GetDesktopWindow(),"Function Call Failed: NtQuerySystemInformation\nThe program will now terminate","ERROR",MB_ICONSTOP);
return 0;
}

while(ProcessInfo!=NULL)
{
//RtlUnicodeStringToOemString(usname,&ProcessInfo->usName,TRUE);
//MessageBoxA(0,usname->Buffer,"",MB_OK);
//RtlFreeOemString(usname);

HANDLE hProc;
hProc=OpenProcess(PROCESS_QUERY_INFORMATION,FALSE,ProcessInfo->dUniqueProcessId);
if (hProc!=NULL)
{
HMODULE hmods[300];
DWORD retv;
char fname[1024];

EnumProcessModules(hProc,hmods,sizeof(hmods),&retv);
retv=retv/sizeof(DWORD);
GetModuleFileNameA(*hmods,fname,sizeof(fname));
MessageBoxA(GetDesktopWindow(),fname,"Process Name",MB_OK);
}
else if (ProcessInfo->dNext!=0)
ProcessInfo=(SYSTEM_PROCESS_INFORMATION_DEF *)((ULONG *)ProcessInfo+ProcessInfo->dNext);
else
ProcessInfo=NULL;

if (ProcessInfo->dNext!=0)
ProcessInfo=(SYSTEM_PROCESS_INFORMATION_DEF *)((ULONG *)ProcessInfo+ProcessInfo->dNext);
else
ProcessInfo=NULL;

}

free(ProcessInfo);

So I get no errors durin calling. but I also get a structure full of zero's.
What is the pb ?

gabby

Directory

sundar_mca6-Mar-06 0:17

sundar_mca

6-Mar-06 0:17

Hello i have created a directory a included a file in that ok.Now using Gobal alloc function i wanted to allocate memory for that folder,how can it been done .

Re: Directory

David Crow6-Mar-06 2:48

David Crow

6-Mar-06 2:48

sundar_mca wrote:
...i wanted to allocate memory for that folder...

What exactly do you mean by this?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Problem with SQLSetEnvAttr

Amit j Patil5-Mar-06 23:49

Amit j Patil

5-Mar-06 23:49

Hello EB,
I have following Code snnipet in my Application,

SQLHENV hEnvHandle;
SQLRETURN nRet;

nRet = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &hEnvHandle);
nRet = SQLSetEnvAttr(hEnvHandle, SQL_ATTR_ODBC_VERSION, (SQLPOINTER) SQL_OV_ODBC3, SQL_IS_INTEGER);

SQLSetEnvAttr return 0 but my Debug Console window show
"First-chance exception in MyApp.exe (KERNEL32.DLL): 0xC0000005: Access Violation."

like this

sr = SQLSetStmtAttr(tempStmt, SQL_ATTR_CURSOR_TYPE, (SQLPOINTER)SQL_CURSOR_DYNAMIC, SQL_IS_INTEGER);
sr = SQLSetStmtAttr(tempStmt, SQL_ATTR_CONCURRENCY , (void *)SQL_CONCUR_LOCK, 0);
APIS also shows this exception.

What might be the cause?
Hope for Reply...
Thanks & Regards
Amit

Declare in form1.h causes error

jantimmerman5-Mar-06 23:43

jantimmerman

5-Mar-06 23:43

Hello,

I was experiencing a strange error that I tracked down to be a declaration in Form1.h
I attemped to reproduce the problem in a brand new project and to my surprise: the error appeared again.

In the new "windows forms" project

test1.cpp:

<br />
#include "stdafx.h"<br />
#include "form1.h"<br />

Added to form1.h

<br />
int test;

error:
test.obj : error LNK2005: "int test" (?test@@$$Q3HA) already defined in IncludeTest.obj
D:\VC\IncludeTest\Debug\IncludeTest.exe : fatal error LNK1169: one or more multiply defined symbols found.

I have tried int test in stdafx.h. This does compile though stdafx.h is also included in both the main and test.cpp.

Project available here (44k, created with VC++ 2005)

I thought this was according to c++ language rules, but apparently I am doing something wrong?

Best regards,
Jan Timmerman

Re: Declare in form1.h causes error

Sebastian Schneider5-Mar-06 23:46

Sebastian Schneider

5-Mar-06 23:46

If you have not already, try adding guards to your header-file.

I am not sure about your background, but each header-file should have a guard:

test1.h:

#ifndef _TEST1_H_
#define _TEST1_H_

..... your header information .....

#endif

test2.h:

#ifndef _TEST2_H_
#define _TEST2_H_

..... your header information .....

#endif

etc.

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