C / C++ / MFC Discussion Boards

Cool_Dev11-Oct-10 3:12

11-Oct-10 3:12

when I tried CEdit::GetLimitText(), it returned 30,000. This is in contrast with what is described here in remarks http://msdn.microsoft.com/en-us/library/bb761647%28VS.85%29.aspx[^]. I think your problem is when exceeding this 30,000 characters. Try calling CEdit::SetLimitText() with much bigger value and count the number of characters you could paste/type.

Re: Problem in Using CEdit box control.

David Crow11-Oct-10 4:13

David Crow

11-Oct-10 4:13

A multi-line edit control can only hold 64K characters. Use a richedit control instead.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Man who follows car will be exhausted." - Confucius

Re: Problem in Using CEdit box control.

Le@rner11-Oct-10 18:19

Le@rner

11-Oct-10 18:19

what is the max limit of rich edit?

Re: Problem in Using CEdit box control.

David Crow12-Oct-10 3:32

David Crow

12-Oct-10 3:32

If I were to guess, I'd say 2GB, possibly 4GB. See here.

One c++ project how to transmit it to WSDL

yu-jian11-Oct-10 1:09

yu-jian

11-Oct-10 1:09

A c++ project, I want to use it in the tomcat, so I need transmit it to WSDL file and then transmit this wsdl file to war package.

I only know use the C# to write web service but I donot know how to transmit this c++ project to web service? Frown | :(

Re: One c++ project how to transmit it to WSDL

Aisteru M.11-Oct-10 23:48

Aisteru M.

11-Oct-10 23:48

You mean you want to use your C# code in C++? Why do you want to use C++?

In C++, if you want to use web service from scratch I'm afraid it will not be easy.. you will have to do it manually (HTTP, TCP/IP sockets, XML, SOAP).

Aisteru

Re: One c++ project how to transmit it to WSDL

yu-jian15-Oct-10 6:50

yu-jian

15-Oct-10 6:50

thanks, I prepare to use the java to write one web service Poke tongue | ;-P

Excel Issue

Pryabu10-Oct-10 23:53

Pryabu

10-Oct-10 23:53

Hi,

I want to read a text in an excel file. I am using the folowing code.

HRESULT hr;
CLSID clsid;

hr = CLSIDFromProgID(L"Excel.Application", &clsid);

BOOL bRet = objApp.CreateDispatch(clsid);

objBooks = objApp.GetWorkbooks();

objBooks.Open("C:\\tmp\\1.xls", VOptional, VOptional,VOptional,VOptional,VOptional, VOptional,
VOptional, VOptional, VTrue, VFalse, VOptional, VOptional);

It is working in a test applicaiton. But i am using the same code in my development project, CreateDispatch function gets failed.

Anyone knows the reason?

Thanks,

Re: Excel Issue

prasad_som11-Oct-10 0:35

prasad_som

11-Oct-10 0:35

Use second parameter of CreateDispatch to check what's causing it to fail.

See
COleDispatchDriver::CreateDispatch [^] for it's usage.

RasSetCustomAuthData is writting corrupted data in rasphone.pbk

birajendu10-Oct-10 22:04

birajendu

10-Oct-10 22:04

Hi,

I am using RasSetCustomAuthData API to set my custom auth info before calling RasDial API.

here is the code piece:

int nError = ::RasSetCustomAuthData(
myphonebook,
myphonebookentry,
(BYTE *)&myCustomAuthData, myCustomAuthData.dwSize );

Here value of myCustomAuthData.dwSize is 2708 . and the size of myCustomAuthData stracture is also 2708. but after calling this function is writting around 5k of data in the .pbk file.

After calling this RasSetCustomAuthdata() api the .pbk file is having entry some thing like this.

CustomAuthData=31444243FFFFFFFF940A0000940A000007000000A800000008000000430054000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
CustomAuthData=000000000000000000000000000000000000000000000000000000000000000000000000

Birajendu
SonicWALL
Bangalore
India

64-Bit Printer Driver vs 32-Bit Printer Driver and viceversa

msr_codeproject10-Oct-10 18:55

msr_codeproject

10-Oct-10 18:55

Hello,
I have a problem.
I have installed a printer driver in 64-bit machine (say PC-1)and shared it.
Now if I try to install the printer (which is already shared in PC-1) in a 32-bit machine (say PC-2), I am able to install it.
But actually it shouldn't happen.
And also I have that the reverse case is also working.
Please show me a way restrict this.
Thanks in advance.

Regards,
msr

Re: 64-Bit Printer Driver vs 32-Bit Printer Driver and viceversa

«_Superman_»10-Oct-10 19:02

«_Superman_»

10-Oct-10 19:02

They are both different machines.
That is why you're able to install it.

«_Superman_»

I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: 64-Bit Printer Driver vs 32-Bit Printer Driver and viceversa

msr_codeproject10-Oct-10 19:30

msr_codeproject

10-Oct-10 19:30

I didn't get your point. Can you just explain me.
I agree that both are different machines. But they are of different configurations too.
My requirement is to restrict it.

Regards
msr

Re: 64-Bit Printer Driver vs 32-Bit Printer Driver and viceversa

«_Superman_»10-Oct-10 22:06

«_Superman_»

10-Oct-10 22:06

How do you want to restrict it?
Do you want to administer one machine to not be able to install the driver?
Or do you want to write a software to prevent driver installation?

«_Superman_»

I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: 64-Bit Printer Driver vs 32-Bit Printer Driver and viceversa

Richard MacCutchan11-Oct-10 0:16

Richard MacCutchan

11-Oct-10 0:16

msr_codeproject wrote:
(say PC-1)and shared it.

Why have you shared it if you do not want the other PC to access it?

Just say 'NO' to evaluated arguments for diadic functions! Ash

Re: 64-Bit Printer Driver vs 32-Bit Printer Driver and viceversa

msr_codeproject11-Oct-10 1:44

msr_codeproject

11-Oct-10 1:44

My requirement is,
A printer shared in a 32-bit machine should be accessible to only 32-bit machines.

And also same case with 64-bit machines.
Now tell me how to restrict it.

Regards
msr

Re: 64-Bit Printer Driver vs 32-Bit Printer Driver and viceversa

Richard MacCutchan11-Oct-10 2:05

Richard MacCutchan

11-Oct-10 2:05

msr_codeproject wrote:
A printer shared in a 32-bit machine should be accessible to only 32-bit machines.

I don't think there is any facility for this, as printers are not sensitive to 32/64 bit systems, as long as each platform has the correct printer driver.

Just say 'NO' to evaluated arguments for diadic functions! Ash

Re: 64-Bit Printer Driver vs 32-Bit Printer Driver and viceversa

Alain Rist11-Oct-10 4:07

Alain Rist

11-Oct-10 4:07

Hi,

msr_codeproject wrote:
My requirement is,
A printer shared in a 32-bit machine should be accessible to only 32-bit machines.

This is a very strange Confused | :confused:

$Shucks | :-\$ requirement as networks are totally insensitive to the bit width of their hosts (actually they intend to connect any heterogeneous machines using their protocol).

You can probably achieve that by partitioning in two subnetworks each having only access to its peers for resource sharing.
This can be done through your DHCP server if any, or by hand on each machine, or by inserting a router if the network topology fits.

In all cases looks like a bad idea giving more trouble than benefit Smile | :)

cheers,
AR

When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)

Implementing CALLBACK in MFC getting error C2440: 'type cast' conversion problem

Vaclav_10-Oct-10 16:48

Vaclav_

10-Oct-10 16:48

I need some help with this error.
I cannot compile this AVIcap function call (callback) in CView

capSetCallbackOnFrame(m_hWndCAVIFrame,FrameCallbackProc);

This is the error I am getting

error C2440: 'type cast' : cannot convert from 'long (__stdcall CMyView::*)(struct HWND__ *,struct videohdr_tag *)' to 'void *'
There is no context in which this conversion is possible

The callback is defined (per documentation) :

LRESULT CALLBACK CMyView::FrameCallbackProc(HWND hWnd, LPVIDEOHDR lpVHdr);

And implemented this way:

LRESULT CALLBACK CMyView::FrameCallbackProc(HWND hWnd, LPVIDEOHDR lpVHdr)
{ …...

I understand that the second parameter in capSetCallbackOnFrame should be a pointer to the callback function, however, I do not understand what I need in addition to “CALLBACK”.
I have tried cast to long* (capSetCallbackOnFrame(m_hWndCAVIFrame,(long*)FrameCallbackProc);) but it did not work and I really do not understand why.
Any constructive help is as always appreciated.
Thanks for your time.
Vaclav

Re: Implementing CALLBACK in MFC getting error C2440: 'type cast' conversion problem

Tim Craig10-Oct-10 17:23

Tim Craig

10-Oct-10 17:23

I'm guessing that your callback function is an ordinary member funcion of CCyView and the API is looking for a global function as a callback. The API doesn't know anything about your class and regular class member functions have the hidden "this" pointer so the signature doesn't match. The API isn't expecting and wouldn't know what to do with a this pointer. You probably need a global function or if you want to encapsulate it in your view class, a static member function.

Once you agree to clans, tribes, governments...you've opted for socialism. The rest is just details.

Re: Implementing CALLBACK in MFC getting error C2440: 'type cast' conversion problem

Vaclav_10-Oct-10 17:54

Vaclav_

10-Oct-10 17:54

Thank you for quick reply.
Yes, I like to use the callback within my class, however, when it is declared as static it won't work with all the parametrs I am currently using as class variables. I guess I need to learn how to use it as global function.
Than I need to copy all the parameters of iterest from the class to global. Right?

Re: Implementing CALLBACK in MFC getting error C2440: 'type cast' conversion problem

Tim Craig10-Oct-10 22:06

Tim Craig

10-Oct-10 22:06

It's a fairly common problem and there are no good solutions that I know of. All leave you feeling their should be a better way but it's what happens when C++ meets the C world. I'd use a static member function just because if you're trying to use a regular member function now, you obviously would like to encapsulate the fuctionality in your class. Also, if you're going to use the result of the callback to affect your view class, making the view instance available to the static member function know the internals. Since it's a view, there's only one instance in an SDI app and hopefully not too many to try to associate in an MDI app.

Once you agree to clans, tribes, governments...you've opted for socialism. The rest is just details.

Re: Implementing CALLBACK in MFC getting error C2440: 'type cast' conversion problem [modified]

Vaclav_11-Oct-10 2:57

Vaclav_

11-Oct-10 2:57

Tim, thanks a million for your help. I think I have a better understanding of this callback business now, but I'aint no expert.
I can get to the data via the callback function, so no problem with illegal access to non ststic cariables.
Unfortunatelly I am using clipboard and it is non ststic function and need to resoleve that.
I still do not get how to access the retrun value from the callaback function. If I can get "back " to the class I may be able to continue and get to the clipboard that way, I hope.
Thanks again for all you input
Vaclav

PS. Just figured out that I do not need to copy data to clipboard.
But still would like to know how to access the return valus.

modified on Monday, October 11, 2010 9:35 AM

Re: Implementing CALLBACK in MFC getting error C2440: 'type cast' conversion problem

Tim Craig11-Oct-10 9:42

Tim Craig

11-Oct-10 9:42

For an SDI app, I'd just keep a pointer to the view somewhere the callback function can find it. Then when it gets the data, it can use the view pointer to call methods on the view instance and to its thing. For an SDI app, it's a little tougher if you want multiple views interacting with the callback. If it was the active view you wanted to receive the data, you could keep the pointer updated everytime a view is activated. Not very C++ elegant but it's one solution.

Some APIs that use callbacks help by letting you pass a "magic cookie" which is usually a void pointer and then give it back to you with the data. If you passed the view pointer, you could cast it back inside the callback function and have your way with the associated view. Not type safe but at least it's in a very limited scope.

Once you agree to clans, tribes, governments...you've opted for socialism. The rest is just details.

Re: Implementing CALLBACK in MFC getting error C2440: 'type cast' conversion problem

Vaclav_11-Oct-10 12:45

Vaclav_

11-Oct-10 12:45

Hello Tim,
I just started to work on this and I guess I am doing it kinda backwards.
I was going to copy the data to globlal buffer and I got stuck on how to tell the application the callback is finished.
I am trying to implement windows subclassing to be able to use PostMessage API and my whole program is now hopelesly broken!
Anyway, I like your approach better,I think it is cleaner, but now I just need to finsh typing !!

But I have dsicovered something during our discussion- every AVI application I have seen uses clipboard to get to the data, however, the callback puts the data into buffer!. No more messing around with clipboard, nice and neat!
Thanks.
Vaclav

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