serial port synchronization - C / C++ / MFC Discussion Boards

Re: help needed about help

rp_suman13-Aug-10 20:30

rp_suman

13-Aug-10 20:30

Anthony Appleyard wrote:
(1) Where is a program to make helps in the new format?

I hope this link will help you:
HTML Help: Context-Sensitive Help for Your Programs
[^]

--
"Programming is an art that fights back!"

Re: help needed about help [modified]

Moak13-Aug-10 22:17

Moak

13-Aug-10 22:17

Anthony Appleyard wrote:
(1) Where is a program to make helps in the new format?
(2) Where is a program to translate an old-type .HLP into a new-type help file?

1) You can use any help authoring tool capable of generating CHM-files (HTML help), see Wikipedia.
2) Performing a quick Google search... there are a couple of tools available, see convert HLP CHM.

It's weekend, yay! Smile | :)

/M

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modified on Saturday, August 14, 2010 4:23 AM

Re: help needed about help

Anthony Appleyard15-Aug-10 12:40

Anthony Appleyard

15-Aug-10 12:40

Thanks.
If s is a char* -type variable containing the name of a *.chm-type file, please how do I call it as a help file?

With the old help I used a format like:

case _HELP_: WinHelp(wn,PROGNAME".HLP",HELP_CONTENTS,0); goto DEF;

C++ MFC - Unable to capture KILLFOCUS notification for DateTimeControl

Kausik4u13-Aug-10 9:17

Kausik4u

13-Aug-10 9:17

In my form, I have a DateTimeControl where user can pick the date from the dropdown calendar or can type in the mm, dd, yyyy values from the keyboard. I need to perform few things once user completes editing and tabs out from the DateTimeControl. I tried the belwo options, but none of them are hit when the control is losing focus:

1. ON_CONTROL_RANGE(WM_KILLFOCUS, DLG_CTRLBASE, DLG_CTRLBASE + DLG_MAXITEMS_CTRL, OnFormKillFocus)
and
2. ON_NOTIFY_RANGE(WM_KILLFOCUS, DLG_CTRLBASE, DLG_CTRLBASE + DLG_MAXITEMS_CTRL, OnFormKillFocus)

As, DateTimeControl doesn't have any separate KILLFOCUS notification (I believe), I am trying with WM_KILLFOCUS.

Can anyone help me with suggestions/alternatives,

Thanks in advance,

CHtmlView - zoom in/out on Ctrl + mouse scroll

rp_suman13-Aug-10 3:08

rp_suman

13-Aug-10 3:08

How to implement the zoom in/out on Ctrl + mouse wheel scroll functionalities of IE browser in CHtmlView?
Any ideas would be highly appreciable..

Regards

--
"Programming is an art that fights back!"

Re: CHtmlView - zoom in/out on Ctrl + mouse scroll

Cool_Dev13-Aug-10 3:58

Cool_Dev

13-Aug-10 3:58

CHtmlView exposes all the functions of IWebBrowser2 interfce of WebBrowser activeX control, which it uses to browse the webpages. Its ExecWeb method is meant to control the commands such as SelectAll, Find, Zoom etc of IE.

CHtmlView::ExecWB

IWebBrowser2::ExecWB Method

see OLECMDID_ZOOM member of OLECMDID Enumeration

hope it helps.

Re: CHtmlView - zoom in/out on Ctrl + mouse scroll

DotNetDominator17-Jun-11 10:53

DotNetDominator

17-Jun-11 10:53

use OLECMDID_OPTICAL_ZOOM. define it as 63 if you get compile error.

CComVariant vZoom((int)dZoomFactor);
m_HTMLCtrl.ExecWB((OLECMDID)OLECMDID_OPTICAL_ZOOM, OLECMDEXECOPT_DODEFAULT, &vZoom, NULL);

serial port synchronization

Sakhalean13-Aug-10 2:39

Sakhalean

13-Aug-10 2:39

Hi,

I am developing serial port communication but i have a problem
while sending and receiving at the same time from the serial port.

how to do the synchronization while sending and receving
data from the serial port.

I have a recevie thread (infinite loop thread )
whenever data is coming from that thread i will update that thread.

When sending from the same port its giving problem.?

Re: serial port synchronization

Luc Pattyn13-Aug-10 2:52

Luc Pattyn

13-Aug-10 2:52

there isn't sufficient information here to offer any real help. Except for this:

When software handshaking is not used (i.e. there is no handshaking at all, or handshaking is handled through hardware lines), then sending and receiving are completely separate operations that do not interfere with each other (except probably at the functional level of your peripheral, which upon receiving a command is likely to send a response).

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

Exporting Static Functions...

Hari_1613-Aug-10 2:29

Hari_16

13-Aug-10 2:29

Is it possible to export a static function in an exe using "declspec(dllexport)"?

Re: Exporting Static Functions... [modified]

Cool_Dev13-Aug-10 3:27

Cool_Dev

13-Aug-10 3:27

in order to be exported or imported from a dll/exe, a function should have external linkage. When we declare a function, by default it gets extern storage. but a static function doesn't gets external linkage so declaring it as __declspec(..) will give error.
Also no way to use more than one storage specifiers at declaration.

modified on Friday, August 13, 2010 10:02 AM

Re: Exporting Static Functions...

Paul Michalik14-Aug-10 2:27

Paul Michalik

14-Aug-10 2:27

This is a contradiction. You cannot export a something which is explicitely declared to be local (static).

How to assign class variable value using loadlibrary function

Pryabu13-Aug-10 1:44

Pryabu

13-Aug-10 1:44

Hi,

Im using LoadLibrary function to load a dll.To call a function,we will use GetProcAddress.But how to assign a value to a variable in that dll. Can anyone pls help me?

Thanks,

Re: How to assign class variable value using loadlibrary function

kapax513-Aug-10 1:53

kapax5

13-Aug-10 1:53

Maybe this would help:

#pragma data_seg (".commondata")
extern /*type-name*/ /*variable-name*/ = /* value */
#pragma data_seg ()

For more information, look here[^].

Re: How to assign class variable value using loadlibrary function

Code-o-mat13-Aug-10 1:58

Code-o-mat

13-Aug-10 1:58

The documentation[^] says:

GetProcAddress Function

Retrieves the address of an exported function or variable from the specified dynamic-link library (DLL).
...

So you probnably can access exported variables the same way as functions.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> "It doesn't work, fix it" does not qualify as a bug report. <
> Amazing what new features none of the programmers working on the project ever heard of you can learn about when reading what the marketing guys wrote about it. <

Re: How to assign class variable value using loadlibrary function

CPallini13-Aug-10 2:18

CPallini

13-Aug-10 2:18

Why don't you define an accessor function in the DLL?
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: How to assign class variable value using loadlibrary function

Pryabu13-Aug-10 2:44

Pryabu

13-Aug-10 2:44

The dll is given by some vendor. Just im using that one. I cant define functions in dll.

Re: How to assign class variable value using loadlibrary function

CPallini13-Aug-10 2:58

CPallini

13-Aug-10 2:58

OK.
As side note, it is really strange that the vendor exposes a DLL's variable.
Smile | :)

How system finds DLLs

kapax513-Aug-10 1:34

kapax5

13-Aug-10 1:34

After linking C++ project with specific .libs and when I run it, how does a system find the corresponding DLLs if they are not in the same directory?
There should be some rules for that, as far as I know.

Re: How system finds DLLs

Niklas L13-Aug-10 1:45

Niklas L

13-Aug-10 1:45

I believe the answer is right here[^] in a document titled Dynamic-Link Library Search Order.

home

Re: How system finds DLLs

kapax513-Aug-10 1:48

kapax5

13-Aug-10 1:48

Thank you. I have been looking precisely for this.

Re: How system finds DLLs

Chris Meech13-Aug-10 1:51

Chris Meech

13-Aug-10 1:51

Most of the search rules are explained here[^]. Smile | :)

Chris Meech
I am Canadian. [heard in a local bar]

In theory there is no difference between theory and practice. In practice there is. [Yogi Berra]

Help Needed on C2159

Hari_1612-Aug-10 23:46

Hari_16

12-Aug-10 23:46

I am writing a function pointer for a static member function and i am getting a C 2159 : ore than one storage class specified.

typedef static A* (*CreateInstance)();

When i build i get the error . Please let me know what i am doing wrong!!!!

Re: Help Needed on C2159

Richard MacCutchan13-Aug-10 0:32

Richard MacCutchan

13-Aug-10 0:32

The static declarator is not allowed on a typedef, your declaration should read:

typedef A* (*CreateInstance)();

It's time for a new signature.

Re: Help Needed on C2159

Paul Michalik14-Aug-10 2:39

Paul Michalik

14-Aug-10 2:39

You cannot use typedef and static that way. "static" defines a storage type for an instance (of whatever) and is not related to the type itself.

By

typedef A* (*CreateInstance)();

you have defined a type alias for a type "function taking no parameters and returning pointer to A". The name of the alias is CreateInstance and it is compatible with anything which satisfies this type definition. You can use your new alias as follows:

class AProvider {
public:
 static A* Create() {
  return new A();
 }
};

A* StandAloneCreate() {
 return new A();
}

...

CreateInstance Creator1 = StandaloneCreate;

CreateInstance Creator2 = AProvider::Create;

A* tA1Instance = Creator1();

A* tA2Instance = Creator2();
...

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