C / C++ / MFC Discussion Boards

Nilesh K.31-May-05 23:56

31-May-05 23:56

1. SetWindowText should help you put the text over the button
2. You need to give your Window Procedure where in you can handle the messages (In a way that we use to do in SDK)

<bold>- Nilesh
<italics>
"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Re: push button

ask_you1-Jun-05 0:12

ask_you

1-Jun-05 0:12

My Window procedure is:

LRESULT CALLBACK WndProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam) {
switch (uMsg)
{
case WM_COMMAND:
{
PostQuitMessage(0);
return 0;

}
break;

case WM_CLOSE:
{
PostQuitMessage(0);
return 0;
}
break;

}

return DefWindowProc(hWnd,uMsg,wParam,lParam);
}

Here i have handled the WM_COMMAND message.
but my problem is if i create 2 push buttons and i want seperate handling for the buttons, how do i distinguish the WM_COMMAND of one button from the WM_COMMAND of the second button?

Re: push button

Nilesh K.1-Jun-05 0:20

Nilesh K.

1-Jun-05 0:20

1.Low-order of WParam would be having the button identifier, compare that with the list of id's that you gave at the time of creation

2. Compare your button handle with in coming hwnd parameter Smile | :)

<bold>- Nilesh
<italics>
"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Re: push button

ask_you1-Jun-05 0:35

ask_you

1-Jun-05 0:35

how do i compare low-order of WParam. i did not create any list of ids. i checked the low-order of WParam. it outputs 0.
Secondly, how do i compare the handle. The button handle is declared in WinMain() and i need to compare in WndProc(i m not able to get the button handle in WinProc)

Re: push button

Nilesh K.1-Jun-05 16:20

Nilesh K.

1-Jun-05 16:20

1. The LOWORD macro retrieves the low-order word from the specified value.
2. Instead of using createwindow try using create of CWnd this would allow you to set the control's id. Store thos id's in some array and check them in your wndproc function.

<bold>- Nilesh
<italics>
"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

How CreateFile can fail???

Dimitris Vikeloudas31-May-05 23:16

Dimitris Vikeloudas

31-May-05 23:16

I want to use CreateFile for creating of new files, overidding existing ones or just simply open them in various modes (depending on my applications' requirements). I know that when it fails it returns INVALID_HANDLE_VALUE and I have to use the GetLastError to find why. However, the GetLastError is a generic system function. Is anywhere any documentation about what errors can be the result of CreateFile. How do I know e.g. if I failed 'cause tried to create an existing file, tried to open an non-existing file, do not have enough disk space, do not have access to the parent directory, lost connection with a remote file store etc.

A cross reference list function-possible failures would be usefull for any Win32 function (I am looking for it not only for the CreateFile).

Anyone can point me to such documentation (books, web pages, etc) will be much appreciated.

Life is a river with mist ahead...

Re: How CreateFile can fail???

Cedric Moonen31-May-05 23:36

Cedric Moonen

31-May-05 23:36

I don't know if there is such a list but what you can do is use the Error Lookup tool. It is already in the tools in Visual C++ 6. You give the error code and it displays the corresponding error string.

Re: How CreateFile can fail???

Nilesh K.31-May-05 23:51

Nilesh K.

31-May-05 23:51

Alternate to error lookup you can as well use FormatMessage API(Though output is same in either case ).

<bold>- Nilesh
<italics>
"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Thanks but not what I am actually looking for...

Dimitris Vikeloudas1-Jun-05 0:36

Dimitris Vikeloudas

1-Jun-05 0:36

Thanks for your help.

I am aware of the FormatMessage API. The Error Lookup is also a good tool. However, all these come from the wrong direction; once you know the error.

My problem is that I cannot find documentation about all possible errors. I would like to write a switch statement of the GetLastError numbers and direct my code to handle important errors in a more appropriate manner than reporting them to the user. And there is where my problem comes. I do not have a list of those errors; not only for CreateFile but for almost and window function.

Look the UNIX manual for open() (E.g. in http://www.rt.com/man/open.2.html) They have a list of all possible errno values that open may return, not all possible errno values in the whole O.S. Why Microsoft never does that for Win32?? Or if it did where can I find it?

Thanks for any help

Life is river with mist ahead...

Re: Thanks but not what I am actually looking for...

geo_m1-Jun-05 1:36

geo_m

1-Jun-05 1:36

Well, maybe because it's difficult to maintain such a documentation.
If you're interested, you can look into the <winerror.h> header, where most of errors are described (found in any good Windows SDK) Wink | ;-)

Don't know if it does any good to you, but at least tried Wink | ;-)

Re: How CreateFile can fail???

Ravi Bhavnani1-Jun-05 11:43

Ravi Bhavnani

1-Jun-05 11:43

Consider using CFile::Open() instead. That will allow you to switch on these[^] error codes contained within a thrown CFileException.

/ravi

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Re: How CreateFile can fail???

Ravi Bhavnani1-Jun-05 11:45

Ravi Bhavnani

1-Jun-05 11:45

Consider using CFile::Open() instead. That will allow you to switch on these[^] error codes contained within a CFileException.

/ravi

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ntohl() in eVC pocketpc application?

zuschauer198031-May-05 23:13

zuschauer1980

31-May-05 23:13

is there any alternative within eVC 4.0?

thx

Printing

sirtimid31-May-05 23:01

sirtimid

31-May-05 23:01

How can I get the default printer which is connected on a pc directly or on a LAN?

Thanks in Advance

Re: Printing

PJ Arends31-May-05 23:10

PJ Arends

31-May-05 23:10

Have a look at CWinApp::GetPrinterDeviceDefaults()

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

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Honoured as one of The Most Helpful Members of 2004

Re: Printing

Nilesh K.1-Jun-05 0:01

Nilesh K.

1-Jun-05 0:01

Check out for EnumPrinters API, This should be able to get you available printers.

<bold>- Nilesh
<italics>
"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Problem receiving UDP packets

ilgale31-May-05 22:48

ilgale

31-May-05 22:48

My application uses a socket to receive periodic UDP multicast messages (messages are send every 100 millisecs and theyr size is variable).
When I run my application in some PCs, I've seen that when it receives a long message (1360 bytes or more), that packet is correctly received but sometimes the next one is lost (the socket doesn't receive it) even if it is a small one. Using a network monitor application, I've seen that this problem happens when the packet is fragmented in more than 7 packets at UDP level.

In sinthesys, the problem is that long packets (fragmented in more that 7 packets at UDP level) are received but lets the socket loose the next one. It doesn't happen any time, and it doesn't happen on any PC.

Can someone tell me what is this problem due to ?
Are there some socket options usefull to solve this problem ?

Thanks a lot !!

fstream buffer limits

mcsherry31-May-05 22:30

mcsherry

31-May-05 22:30

Can anyone tell me what the maximum number of unsigned chars that can be read in from a file using the read method.

TIA,
Andy

MFC, push release button help

Rostfrei31-May-05 22:26

Rostfrei

31-May-05 22:26

Hello!

I'm using VC++ in .NET Studio. I made simple MFC dialog based application with resource builder. I know how to handle some button press and event is executed on button release. But I don't know how to handle button press and button release. For example if I press (mouse button down) "LIGHT" button, virtual light would start to shine and when I release button (mouse button up) virtual light would stop shineing.

Can it be done?

Regards,

Rostfrei

Converting txt to bmp

Nilesh K.31-May-05 22:09

Nilesh K.

31-May-05 22:09

Hi,

Can anyone suggest a way to convert a text file to bmp at runtime Confused | :confused:

,
I was able to create and save the bitmap file but was unable to append text to it. Sigh | :sigh:

<bold>- Nilesh
<italics>
"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Re: Converting txt to bmp

PJ Arends31-May-05 22:15

PJ Arends

31-May-05 22:15

Load (or create) the bitmap, select it into a memory DC and use DrawText or TextOut to draw your text onto the bitmap the same as you would draw text onto the screen DC. Select the bitmap out of the DC and save it.

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

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Honoured as one of The Most Helpful Members of 2004

Re: Converting txt to bmp

Nilesh K.31-May-05 22:24

Nilesh K.

31-May-05 22:24

already tried that but I don't see any text in the saved bmp file Confused | :confused:

<bold>- Nilesh
<italics>
"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Re: Converting txt to bmp

PJ Arends31-May-05 23:01

PJ Arends

31-May-05 23:01

Show your code.

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

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Honoured as one of The Most Helpful Members of 2004

Re: Converting txt to bmp

Nilesh K.31-May-05 23:14

Nilesh K.

31-May-05 23:14

<br />
        CreateBitmap();<br />
<br />
	m_pMemDC = new CDC;<br />
<br />
	VERIFY( m_pMemDC->CreateCompatibleDC(m_pWinDC) );<br />
<br />
	m_pOldBitmap = m_pMemDC->SelectObject( &m_Bitmap );<br />
<br />
	CString str("This is a test message");<br />
<br />
	CPen cp;<br />
	cp.CreatePen(PS_SOLID, 2,RGB(255,255,255));<br />
<br />
	CRect rect;<br />
	GetClientRect(&rect);<br />
<br />
	m_pMemDC->SelectObject(&cp);<br />
	m_pMemDC->DrawText(str,str.GetLength(),rect,DT_LEFT);<br />
<br />
	PBITMAPINFO pbi = getInfoStruct(m_Bitmap);<br />
<br />
	CreateBMPFile("test.bmp",pbi,m_Bitmap,m_pMemDC->m_hDC);<br />
        m_pMemDC->SelectObject(m_pOldBitmap);<br />

<bold>- Nilesh
<italics>
"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Re: Converting txt to bmp

ThatsAlok1-Jun-05 0:15

ThatsAlok

1-Jun-05 0:15

Nilesh K. wrote:
CreateBMPFile("test.bmp",pbi,m_Bitmap,m_pMemDC->m_hDC);

I Believe, Such function doesn't exist in WIndow's Api!.
could you show coding for that too, as your problem may be at the time of saving!

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cheers,
Alok Gupta

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