Re: Reading certain bits - C / C++ / MFC Discussion Boards

Re: Windows NT Service won't run on 2000

Anonymous8-Nov-02 7:18

8-Nov-02 7:18

Unless there is something nt vs. 2000 specific in the libraries, I don't believe this to be the case, as the program works perfectly when I run it as a "standard" application, it is only when I run this as a service that there is a problem. Also the Service Main function spawns a thread where all of the applications work is done. Which incidentally is ftp processing, if that helps at all.

Pass a socket handle between apps..

Anonymous8-Nov-02 5:27

Anonymous

8-Nov-02 5:27

Is it possible to pass a socket handle between apps?

Re: Pass a socket handle between apps..

valikac8-Nov-02 5:43

valikac

8-Nov-02 5:43

Yes. HANDLE is a pointer to a pointer. Do you develop the applications or just one? The reason I ask is because you have to implement a solutino to send and receive the handles.

Kuphryn

Re: Pass a socket handle between apps..

Anonymous8-Nov-02 5:46

Anonymous

8-Nov-02 5:46

I am developing both applications.. What functions should I look at for doing such a thing?

Re: Pass a socket handle between apps..

valikac8-Nov-02 6:02

valikac

8-Nov-02 6:02

There are several solutions for data sharing among processes.

- Winsock
- File-Mapping
- Namepipe

I recommend file-mapping. Mapping the handle of your socket with a valid name. Search for that file-mapped on the other applications via its name.

Kuphryn

Reading certain bits

ISIS558-Nov-02 4:37

ISIS55

8-Nov-02 4:37

Suppose I have an unsigned integer variable. How can I read only bits 3 to 10 off of it?

Isaac Sasson,
Small time programmer - complainer at large!
Sonork ID 100.13704

Re: Reading certain bits

benjymous8-Nov-02 4:52

benjymous

8-Nov-02 4:52

do a binary and (&&) with a bitmask

i.e.

binary 0011111111000000 = 0x3FC0 (hex)

so

nResult = nNumber && 0x3FC0;

You can then use the shift operators << or >> to shift the bits if you want to strip of trailing zeros

--
Help me! I'm turning into a grapefruit!

Re: Reading certain bits

Iain Clarke, Warrior Programmer8-Nov-02 4:58

Iain Clarke, Warrior Programmer

8-Nov-02 4:58

BOOL IsBitOn (UINT uOriginal, UINT nBit)<br />
{<br />
    uOriginal >>= nBit; // Shift right, aka divide by 2^n<br />
    uOriginal &= 1; // Just get the (now) bottom bit<br />
    return (uOriginal == 1);<br />
}

and for the concisists...

#define IsBitOn (x,n)  ((x>>n)&1)<code><br />
<br />
Or if you just want to mask out the other bits,<br />
<br />
<code>uOriginal &= 0x03fc;  // &= 0000 0011 1111 1100 in binary.

I hope that helped,

Iain.

how to see preprocesor generated files?

Rene De La Garza8-Nov-02 4:35

Rene De La Garza

8-Nov-02 4:35

i want to see what does the preprocesor generates how can i do that?, using vc++ 6.0

Re: how to see preprocesor generated files?

Stephane Rodriguez.8-Nov-02 4:57

Stephane Rodriguez.

8-Nov-02 4:57

add /E to the compiler options. Preprocessed files will go to stdout.

Back to real work : D-22.

Re: how to see preprocesor generated files?

Rene De La Garza8-Nov-02 5:05

Rene De La Garza

8-Nov-02 5:05

thanks.

OnEnterIdle and HTMLDialog

Emmanuel Derriey8-Nov-02 4:09

Emmanuel Derriey

8-Nov-02 4:09

Hi!
I have a MFC application that handle idle processing by overloading CWinApp::OnIdle ; for menus and dialogs, I handle the WM_ENTERIDLE in my MainFrame. But I use ShowHTMLDialog API to display HTML page, and then, I don't receive EnterIdle any more. Why ?
Thanks for any help
Regards

Emmanuel Derriey

Re: OnEnterIdle and HTMLDialog

includeh108-Nov-02 4:37

includeh10

8-Nov-02 4:37

i am not sure if WM_ENTERIDLE is a standard message.
if yes, u can get if from PreTranslateMessage function.
if not (it's a fuction call actually), microsoft never offers it for the class.

includeh10

Re: OnEnterIdle and HTMLDialog

Stephane Rodriguez.8-Nov-02 4:55

Stephane Rodriguez.

8-Nov-02 4:55

ShowHTMLDialog shows a modal dialog box, so by definition you can't expect your app to continue to go into idle from time to time.
There's a work around for that, you have to create a separate thread, and call ShowHTMLDialog in that thread.

Back to real work : D-22.

typedef struct

Hugo Hallman8-Nov-02 2:45

Hugo Hallman

8-Nov-02 2:45

Why does some write:
typedef struct {
foo bar;
} MyStruct;
whilst I write
struct MyStruct {
foo bar;
};

I know that it's possible to declare LPMyStruct in the first example.
And why the _TAGMYSTRUCT in some cases?

Re: typedef struct

jhwurmbach8-Nov-02 2:53

jhwurmbach

8-Nov-02 2:53

I think the fomer syntax is C-code (as opposed to C++), meant to trick some C-compilers into doing what you want.

Re: typedef struct

includeh108-Nov-02 3:41

includeh10

8-Nov-02 3:41

it is all for C.

typedef struct ABC
{
foo bar;
} MyStruct;

i.e.
MyFunction(MyStruct ms); //C needs struct as description
similar to:
MyFunction(struct ABC ms);

it can be used by both C and C++.

includeh10

Re: typedef struct

jhwurmbach8-Nov-02 3:50

jhwurmbach

8-Nov-02 3:50

That was what I meant: You can use all of these forms in both C and C++, but you only NEED them in C.

Error when change CString data to CString data(in Hex format)

ooosawaddee38-Nov-02 2:44

ooosawaddee3

8-Nov-02 2:44

I want to change CString data to CString data(in Hex format) and change back from CString data (in Hex format)
to CString data. So I write this below code

<br />
CString m_str = "chop][:" ;<br />
CString ivstr;<br />
StrToHexStr(m_str, ivstr); <br />

StrToHexStr function change CString data to CString data(in Hex format)which have these below detail.

<br />
void StrToHexStr(CString& strData, CString& hexstrData)<br />
{	<br />
int j;<br />
CString strtemp;<br />
<br />
hexstrData.Empty();<br />
for (j=0;j<strData.GetLength();j++){<br />
strtemp.Format("%02X",strData.GetAt(j));<br />
hexstrData+=strtemp;<br />
}<br />
}<br />

I get ivstr = "63686F705D5B3A" (from m_str = "chop][:")

Then I write program to change back from CString data (in Hex format)to CString data.

<br />
ivstr = "63686F705D5B3A"; <br />
HexStrToStr(ivstr, m_str);<br />

HexStrToStr function change CString data (in Hex format)to CString data which have these below detail.

<br />
void HexStrToStr(CString& hexstrData, CString& strData)<br />
{	<br />
int j, strlen;<br />
CString c1, c2;<br />
int temp;<br />
unsigned char ctemp;<br />
<br />
strData.Empty();<br />
<br />
for (j=0;j<hexstrData.GetLength();j+=2)<br />
{<br />
    c1= hexstrData.GetAt(j);<br />
	if ((c1 == 'A')||(c1 == 'B')||(c1 == 'C')||(c1 == 'D')||(c1 == 'E')||(c1 == 'F'))<br />
	{<br />
		ctemp = c1[0];<br />
		temp = (ctemp-55)*16;<br />
	}<br />
	else<br />
	{<br />
	temp = atoi(c1)*16;<br />
	}<br />
	c2= hexstrData.GetAt(j+1);<br />
	if ((c2 == 'A')||(c2 == 'B')||(c2 == 'C')||(c2 == 'D')||(c2 == 'E')||(c2 == 'F'))<br />
	{<br />
	ctemp = c2[0];<br />
	temp = (ctemp-55);<br />
	}<br />
	else<br />
	{<br />
	temp += atoi(c2);<br />
	}<br />
	strData += temp;<br />
}<br />
}<br />

But I do not get m_str = "chop][:"
m_str is the other string

Do you know how to solve my problem?
Thank you for your reply.

Re: Error when change CString data to CString data(in Hex format)

jmkhael8-Nov-02 4:00

jmkhael

8-Nov-02 4:00

When reversing the process, take each two Hex chars, convert them to a long (strtol base 16 ) then format it into a char, then concatenate into a string

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Window coords and toolbar buttons

S O S8-Nov-02 2:26

S O S

8-Nov-02 2:26

How can I get the coordinates of a window, relative to it's parent?
And how can I create sticky buttons on a toolbar? (Staying up/down when clicked)

Using MFC

Re: Window coords and toolbar buttons

benjymous8-Nov-02 3:57

benjymous

8-Nov-02 3:57

Not sure about the coords part, but sticky buttons work exactly the same way as checkable menu items do

--
Help me! I'm turning into a grapefruit!

Re: Window coords and toolbar buttons

S O S8-Nov-02 5:32

S O S

8-Nov-02 5:32

benjymous wrote:
Not sure about the coords part, but sticky buttons work exactly the same way as checkable menu items do

And that would be... how :p

Re: Window coords and toolbar buttons

Iain Clarke, Warrior Programmer8-Nov-02 5:29

Iain Clarke, Warrior Programmer

8-Nov-02 5:29

Its relatively simple:

CRect GetCoordsRelativeToParent (CWnd *pCoordsOf)<br />
{<br />
    CWnd *pParent = NULL;<br />
    ASSERT(pCoordsOf);<br />
    if (pCoordsOf != NULL)   // Lets be a little untrusting!<br />
        pParent = pCoordsOf->GetParent ();<br />
<br />
    CRect rcCoords;<br />
    pCoordsOf->GetWindowRect (&rc);<br />
    pParent->ScreenToClient (&rc);<br />
<br />
    return rc;<br />
}<code><br />
<br />
I'm going of memory, so the syntax of the commands may be a little wrong, but you hopefully the idea!<br />
<br />
Iain.

Re: Window coords and toolbar buttons

S O S8-Nov-02 5:33

S O S

8-Nov-02 5:33

Thanks a lot Smile | :)

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