Re: saving file [modified] - C / C++ / MFC Discussion Boards

Rajesh R Subramanian25-May-09 0:39

25-May-09 0:39

Your post is confusing, unclear and clueless ALL at the same time. Anyone attempting to answer you will have a tendency to jab a needle into their eye.

However, to answer your post: If the other application has opened the file in exclusive access mode, you will not be able to even read it. Again, if you do have access to the file, it is not clear from your post if you want to save updates to the same file (depends on if the application that created the file is allowing other applications to perform a write operation on it).

It is a crappy thing, but it's life -^ Carlo Pallini

Re: saving file

trioum25-May-09 0:50

trioum

25-May-09 0:50

so
I want to auto save the file.

Trioum

modified on Friday, June 12, 2009 2:28 AM

Re: saving file

Rajesh R Subramanian25-May-09 1:02

Rajesh R Subramanian

25-May-09 1:02

WHAT SAVE BUTTON? Where is it? In your app or in the third party app?

It is a crappy thing, but it's life -^ Carlo Pallini

Re: saving file

trioum25-May-09 1:07

trioum

25-May-09 1:07

in the file

Trioum

modified on Friday, June 12, 2009 2:31 AM

Re: saving file

Rajesh R Subramanian25-May-09 1:23

Rajesh R Subramanian

25-May-09 1:23

My question was: Where is the save button?

It is a crappy thing, but it's life -^ Carlo Pallini

Re: saving file

Garth J Lancaster25-May-09 0:10

Garth J Lancaster

25-May-09 0:10

not sure what you mean - if its some sort of program you've written, then its quite easy to keep a 'dirty'/'has-been-modified' flag, set that when ever data is changed, inspect it periodically and save the data if it has been set.

If you mean controlling some sort of other program not written by you then you'll have to supply more information

'g'

Re: saving file

Hamid_RT25-May-09 0:59

Hamid_RT

25-May-09 0:59

But do you know detail of each file for example pdf files or 3gp files and etc?

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Re: saving file [modified]

trioum25-May-09 1:02

trioum

25-May-09 1:02

no one is answering everyone is questionning and fighting with each other

Trioum

modified on Tuesday, May 26, 2009 12:54 AM

Re: saving file

killabyte25-May-09 20:34

killabyte

25-May-09 20:34

because your question is terrible, so vague, either your grasp of english is letting you down or your waiting to be a darwin award poster boy

Re: saving file

Maximilien25-May-09 4:56

Maximilien

25-May-09 4:56

What is the question ?

do you need help in writing files of different formats ?
or
do you need help on how to implement an auto-save feature ?

This signature was proudly tested on animals.

ANSI to UTF-8

Souldrift24-May-09 23:15

Souldrift

24-May-09 23:15

Hi there,

I found a code snippet on the web which converts an ANSI string to UTF-8 format. I implemented it in my own and it works.

<br />
////////////<br />
// to UTF-8<br />
char text[1024]={0};<br />
WCHAR w[1024]={0};<br />
int erg=0;<br />
<br />
strcpy(text, m_pData);<br />
<br />
erg=MultiByteToWideChar(CP_ACP, 0, text, -1, w, sizeof(w) / sizeof(WCHAR)); // ANSI to UNICODE<br />
erg=WideCharToMultiByte(CP_UTF8, 0, w, -1, text, sizeof(text), 0, 0);	    // UNICODE to UTF-8<br />
//<br />
////////////<br />

After that 'text' is UTF-8 formatted just nicely.

Now I was wondering, why doesn´t the following (slightly altered) code not work? I just created a char* instead of char[];

<br />
////////////<br />
// to UTF-8<br />
char* text = new char[1024];<br />
WCHAR w[1024]={0};<br />
int erg=0;<br />
<br />
strcpy(text, m_pData);<br />
<br />
erg=MultiByteToWideChar(CP_ACP, 0, text, -1, w, sizeof(w) / sizeof(WCHAR)); // ANSI to UNICODE<br />
erg=WideCharToMultiByte(CP_UTF8, 0, w, -1, text, sizeof(text), 0, 0);	    // UNICODE to UTF-8<br />
//<br />
////////////<br />

Thanks,

Souldrift

Re: ANSI to UTF-8

tolw25-May-09 1:00

tolw

25-May-09 1:00

My guess is in the first example the sizeof operator can calculate the size of the array. When it comes to pointers - no such luck. Try passing the size of the allocated memory directly (preferably by using a #define):

#define ARRAY_SIZE 1024
erg=MultiByteToWideChar(CP_ACP, 0, text, -1, w, ARRAY_SIZE); // ANSI to UNICODE
erg=WideCharToMultiByte(CP_UTF8, 0, w, -1, text, ARRAY_SIZE, 0, 0); // UNICODE

Re: ANSI to UTF-8

Nibu babu thomas25-May-09 2:02

Nibu babu thomas

25-May-09 2:02

Souldrift wrote:
char* text = new char[1024];
WCHAR w[1024]={0};
int erg=0;

Try to avoid using numbers directly or hard coding instead store in a constant.

const int SIZE = 1024; // Bytes
char* text = new char[SIZE];
WCHAR w[SIZE]={0};

erg=MultiByteToWideChar(CP_ACP, 0, text, -1, w, SIZE); // ANSI to UNICODE
erg=WideCharToMultiByte(CP_UTF8, 0, w, -1, text, SIZE, 0, 0); // UNICODE to UTF-8

So when you change SIZE, this code still keeps working.

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Re: ANSI to UTF-8

Souldrift25-May-09 2:34

Souldrift

25-May-09 2:34

Thanks. That to both of you. That works.
Problem is that I wanted to avoid a const size and instead use the variable size of m_pData (the original text). Is that possible?

Souldrift

Re: ANSI to UTF-8

tolw25-May-09 2:56

tolw

25-May-09 2:56

Since m_pData is a string you can use string operations like strlen. Try this:

char *text = new char[strlen( m_pData ) + 1 /*The +1 is for the End-of-String \0*/];
WCHAR *w = new WCHAR[strlen( m_pData ) + 1];
int erg=0;

strcpy(text, m_pData);

erg=MultiByteToWideChar(CP_ACP, 0, text, -1, w, strlen( text )); // ANSI to UNICODE
erg=WideCharToMultiByte(CP_UTF8, 0, w, -1, text, wcslen( w ), 0, 0); // UNICODE to UTF-8

Just make sure that the strings are all NULL terminated!!

error LNK2019: unresolved external symbol "long __cdecl _com_dispatch_method

pandit8424-May-09 23:14

pandit84

24-May-09 23:14

Hi I am using a ADO in my project. But when i compile my code i am getting the follwoing error.

error LNK2019: unresolved external symbol "long __cdecl _com_dispatch_method(struct IDispatch *,long,unsigned short,unsigned short,void *,wchar_t const *,...)" (?_com_dispatch_method@@YAJPAUIDispatch@@JGGPAXPB_WZZ) referenced in function "public: long __thiscall ConnectionEvents::InfoMessage(struct Error *,enum EventStatusEnum *,struct _Connection *)" (?InfoMessage@ConnectionEvents@@QAEJPAUError@@PAW4EventStatusEnum@@PAU_Connection@@@Z)

I have added this in my stdafx.cpp

#import "..\..\..\..\..\Microsoft\Redistribute\MSADO15.dll" no_namespace \
                  rename("Parameters","ADOParams") \
                  rename("Connection","ADOCon") \
                  rename("Parameter","ADOParam") \
                  rename("EOF", "adoEOF") \                  implementation_only

and below code in my stdafx.h file

#import "..\..\..\..\..\Microsoft\Redistribute\MSADO15.dll" no_namespace \
                  rename("Parameters","ADOParams") \
                  rename("Connection","ADOCon") \
                  rename("Parameter","ADOParam") \
                  rename("EOF", "adoEOF") \                  no_implementation

Please provide any comment i am not able to find out what is to be included to avoid this linking error.

Re: error LNK2019: unresolved external symbol "long __cdecl _com_dispatch_method

Stuart Dootson25-May-09 1:42

Stuart Dootson

25-May-09 1:42

Make sure you're linking against comsupp.lib (or some variant thereof - there's comsupp, comsuppd, comsuppw and comsuppwd) - that's where that symbol is defined. There is a #pragma in the #import process that specifies to link against that library, but it's possible, I guess, that doing the #import in stdafx negates the effect of the #pragma.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

HEAP CORRUPTION DETECTED!

susanne124-May-09 23:01

susanne1

24-May-09 23:01

hallo, i have the following piece of code , when i try to delete the lpKeyPoint i get HEAP CORRUPTION DETECTED!

LPPOINT lpKeyPoint;
lpKeyPoint = (LPPOINT)new LPPOINT();
GetCaretPos((LPPOINT)lpKeyPoint);
if(lpKeyPoint)
{
delete lpKeyPoint;
lpKeyPoint = NULL;
}
How can i solve this problem?
Thanks.

Re: HEAP CORRUPTION DETECTED!

CPallini24-May-09 23:19

CPallini

24-May-09 23:19

susanne1 wrote:
lpKeyPoint = (LPPOINT)new LPPOINT()

That should be:

lpKeyPoint = new POINT();

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: HEAP CORRUPTION DETECTED!

susanne124-May-09 23:50

susanne1

24-May-09 23:50

thanks it worsk,but when i move the curosor up i get a worng value of y:

CPoint* ptrKeyPoint = new CPoint();
int nCursorLine = 0;
if((pMsg->message == WM_KEYDOWN)||(pMsg->message == WM_LBUTTONDOWN))
{
if((pMsg->wParam == VK_RETURN) || (pMsg->wParam == VK_UP)||(pMsg->wParam == VK_DOWN) || (pMsg->message == WM_LBUTTONUP))
{
GetCaretPos((LPPOINT)ptrKeyPoint);
nCursorLine = ptrKeyPoint->y;
}

if(ptrKeyPoint)
{
delete ptrKeyPoint;
ptrKeyPoint = NULL;
}
}

Re: HEAP CORRUPTION DETECTED!

CPallini25-May-09 0:03

CPallini

25-May-09 0:03