Can't compile function template on VC7.1 - C / C++ / MFC Discussion Boards

Tim Smith3-May-05 17:43

3-May-05 17:43

Yes. I have been doing process control and industrial automation for many years. I have worked on my embedded processor systems (not just WinCE) and have written many device drivers for different hardware platforms (Z-80 using CPM, 68k running PDOS(?), 386 using only god knows what).

Doing anything in a tight loop testing any type of flag without resolving to a kernel waitable object is a bad idea. It will lock other applications out of the CPU. Even spinlocks will only loop for a very limited amount of time prior to resorting to a kernel object.

I would question the overall design if someone needed to do such a thing. There are cases where that level of timing is needed, but as already stated user mode isn't a good place to do such things. Thus, even if he could get it to work, it wouldn't be reliable in the real world.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: What the best way to sleep 1 ms

Abu Mami3-May-05 6:20

Abu Mami

3-May-05 6:20

Have children.

Water-wall

DinaMazor3-May-05 1:19

DinaMazor

3-May-05 1:19

I need an opaque dialog or bitmap for demo version. The GUI is in written in MFC. I need something over all dialogs with opaque letters DEMO.
What can you suggest me,
thanx Dina

Dina

Re: Water-wall

QuiJohn3-May-05 2:01

QuiJohn

3-May-05 2:01

Use OnEraseBkgrnd to replace the background color with a bitmap of your choice? That might be the easiest way.

Re: Water-wall

Blake Miller3-May-05 7:38

Blake Miller

3-May-05 7:38

Draw directly to the user's screen?
Writing DEMO all over the place?

hide from application list

3-May-05 0:42

i want to know that how to hide the application from appplication list when we press the Ctrl+alt+delete. i want to do this in the visual c6.

ddd

Re: hide from application list

ThatsAlok3-May-05 1:00

ThatsAlok

3-May-05 1:00

http://www.codeproject.com/system/preventclose.asp[^]

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Can't compile function template on VC7.1

Teerayoot2-May-05 23:48

Teerayoot

2-May-05 23:48

i want to compile this code :

<br />
template <class T> <br />
inline const T& max ( const T& a,  const T& b) <br />
{ <br />
		return a < b ? b : a ; <br />
<br />
<br />
}<br />

got this error message :
: error C2226: syntax error : unexpected type 'T'
: error C2062: type 'const int' unexpected
: error C2059: syntax error : ')'
: error C2143: syntax error : missing ';' before '{'
: error C2447: '{' : missing function header (old-style formal list?)

but it's successfully compiled on BCB6.0 .
VC7.1 is just stupid???

Re: Can't compile function template on VC7.1

ThatsAlok2-May-05 23:59

ThatsAlok

2-May-05 23:59

Teerayoot wrote:
template
inline const T& max ( const T& a, const T& b)
{
return a < b ? b : a ;

}

put above code in header file !

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: Can't compile function template on VC7.1

Rahim Rattani3-May-05 0:25

Rahim Rattani

3-May-05 0:25

try using as

template<typename T><br />
inline const T& getMax ( const T& a, const T& b) <br />
{ <br />
return a < b ? b : a ; <br />
}

The problem is with the name of the function. I have renamed it from "max" to "getMax" because macros with the name "min" and "max" already exist in stdlib.h, and same name of the function as those macros caused the errors.

Rahim Rattani
Software Engineer,
Matrix Systems (Pvt) Ltd.,
Karachi - Pakistan

Re: Can't compile function template on VC7.1

Teerayoot3-May-05 2:07

Teerayoot

3-May-05 2:07

Error message make me very confuse.

it should say
"name of the function max alredy exist in standard library!"
or somethings that can make sense.

Smile | :)

Thank you.

How to do this????

eli150219792-May-05 23:41

eli15021979

2-May-05 23:41

Hi,
i know that i can set each of the incoming parameters of my function to a default value, like this:

void Function(int x , int y = 10);

and then,i can call to the function in 2 ways:

Function(10,20); //x = 10 , y = 20
Function(10);    //x = 10 , y = 10

my question is - how can i set a CString object to empty by default?
for example:

void Function(int x , CString string = ???????);

and call that function:

Function(10,"Not an empty string"); // x = 10 , string = "Not an empty string"
Function(10); // x = 10 , string = string.Empty()

anyone???????? D'Oh! | :doh:

Regards,
Eli

Re: How to do this????

Rahim Rattani2-May-05 23:57

Rahim Rattani

2-May-05 23:57

As smple as u set the integer values.

void Function( int x , CString string = "" );

Rahim Rattani
Software Engineer,
Matrix Systems (Pvt) Ltd.,
Karachi - Pakistan

Re: How to do this????

toxcct3-May-05 0:10

toxcct

3-May-05 0:10

eli15021979 wrote:
my question is - how can i set a CString object to empty by default?
for example:
void Function(int x , CString string = ???????);

and call that function:
Function(10,"Not an empty string"); // x = 10 , string = "Not an empty string"

why don't you do the same as you code with integers...?

<font color=blue>void</font> Function(<font color=blue>int</font> x , CString string = <font color=gray>""</font>);

Then you call it the way you like...

Function(10, <font color=gray>"Hello CP"</font>);    <font color=green>// Function(10, "")</font>
Function(10);                <font color=green>// Function(10, "Hello CP")</font>

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: How to do this????

Blake Miller3-May-05 8:04

Blake Miller

3-May-05 8:04

Also, you need to decide if the function accepting the CString really REQUIRES a CString object.

Maybe you can get by with a LPCTSTR instead.

Then you can write your function:
void Function(int x , LPCTSTR szString = NULL);

and call that function:

Function(10, "Not an empty string"); // x = 10 , szString != NULL<br />
Function(10); // x = 10 , szString = NULL

You can get really tweaked after awhile working with code all written to accept a CString by value, and then when you examine the function's use of the string, it could have easily sufficed to send it a string constant instead.

Group calendar control ?

Bernhard2-May-05 23:39

Bernhard

2-May-05 23:39

Is there any Group Calender control available (preferably as a MFC Control)?
(Commercial or Non - Commercial)

Something like http://www.officeclip.com/web/calendar/tour3.html
and the OfficeClip Group Calendar - Invite Attendees - Picture (the one down the site).

I should see the appointments of a group of people and (ideally) someone should be able to dynamically drag an appointment and move it to another date / time.

Any help appreciated.

All the label says is that this stuff contains chemicals "... known to the State of California to cause cancer in rats and low-income test subjects."
Roger Wright
http://www.codeproject.com/lounge.asp?select=965687&exp=5&fr=1#xx965687xx

SetWindowRgn() for buttons

Asha Udupa2-May-05 23:24

Asha Udupa

2-May-05 23:24

Hi
I am trying to set a region for buttons. here is code:

CRect the_rect;
m_SearchBtn->GetClientRect(the_rect);
HRGN region_handle = CreateEllipticRgnIndirect(the_rect);
int nRet=m_SearchBtn->SetWindowRgn(region_handle,TRUE);

nRet value is always non-zero. But still the button shape won't change. Could anyone tell me what is wrong?

Regards

Re: SetWindowRgn() for buttons

Behzad Ebrahimi2-May-05 23:40

Behzad Ebrahimi

2-May-05 23:40

Do NOT conflit refrence and value!
In MSDN --> void GetClientRect( LPRECT lpRect ) const;
So use m_SearchBtn->GetClientRect(&the_rect);
HRGN region_handle = CreateEllipticRgnIndirect(&the_rect);

....

Re: SetWindowRgn() for buttons

Asha Udupa2-May-05 23:45

Asha Udupa

2-May-05 23:45

It won't work even with reference.

Re: SetWindowRgn() for buttons

ThatsAlok3-May-05 0:01

ThatsAlok

3-May-05 0:01

First Set the Style of Button to Owner Draw!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: SetWindowRgn() for buttons

Asha Udupa3-May-05 0:05

Asha Udupa

3-May-05 0:05

If I enable OWNERDRAW, button is not been visible. Otherwise it displays in a default rectangle shape.

Re: SetWindowRgn() for buttons

Behzad Ebrahimi3-May-05 0:14

Behzad Ebrahimi

3-May-05 0:14

For more information see one of stuff on this site such as:
http://www.codeproject.com/buttonctrl/cxskinbutton.asp[^]

I think you must use SelectClipRgn(...) after SetWindowRgn(...)

BeB

Re: SetWindowRgn() for buttons

Asha Udupa3-May-05 0:25

Asha Udupa

3-May-05 0:25

SelectClipRgn(..) didn't help........

Re: SetWindowRgn() for buttons

ThatsAlok3-May-05 0:28

ThatsAlok

3-May-05 0:28

After Setting Owner Draw Style, You have to use [CButton::DrawItem]to draw button.

Or take a look at button wrapper classes here at CP

[Link]
http://www.codeproject.com/buttonctrl/[^]

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: SetWindowRgn() for buttons

Asha Udupa3-May-05 0:30

Asha Udupa

3-May-05 0:30

I don't want to owner draw the button. I just need to change the shape of it. Any other solution?

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