Re: Windows File Manipulation - C / C++ / MFC Discussion Boards

Re: new user' test only

Nathan Addy29-Jun-05 9:31

Nathan Addy

29-Jun-05 9:31

I don't really know what I expected to see there... Sigh | :sigh:

Re: new user' test only

P-Rex29-Jun-05 21:20

P-Rex

29-Jun-05 21:20

Windows File Manipulation

DigiFaith29-Jun-05 4:41

DigiFaith

29-Jun-05 4:41

I'm working on a bit of code that manages files and directories with operations such as copy, delete, archive to removable media, etc. If the program encounters an error while performing one of these operations, I want to be able to give the user some information as to the nature of the error, such as file not found, directory not found, access failure, invalid path, etc.

However, many of the functions I'm using, such as SHFileOperation, return only "successful" or "unsuccessful", and I can't find a way to get any information on the nature of the error on an "unsuccessful" return. Any ideas?

Re: Windows File Manipulation

Ravi Bhavnani29-Jun-05 5:11

Ravi Bhavnani

29-Jun-05 5:11

~~See GetLastError()[^]~~.

I was wrong - this won't help.

/ravi

My new year's resolution: 2048 x 1536
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Re: Windows File Manipulation

David Crow29-Jun-05 5:25

David Crow

29-Jun-05 5:25

Where is it documented that SHFileOperation() uses GetLastError()?

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: Windows File Manipulation

Ravi Bhavnani29-Jun-05 5:54

Ravi Bhavnani

29-Jun-05 5:54

It isn't. I incorrectly assumed SHFileOperation() called SetLastError().

/ravi

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Re: Windows File Manipulation

Jose Lamas Rios29-Jun-05 5:12

Jose Lamas Rios

29-Jun-05 5:12

SHFileOperation already informs the user of any error, unless you use the FOF_NOERRORUI flag in your request.

--
jlr
http://jlamas.blogspot.com/[^]

Re: Windows File Manipulation

DigiFaith29-Jun-05 6:22

DigiFaith

29-Jun-05 6:22

Is there any documentation on what error messages SHFileOperation uses? I've tested the function a few times without the FOF_NOERRORUI flag, and it can sometimes return unsuccessful without displaying any error message.

Re: Windows File Manipulation

Jose Lamas Rios29-Jun-05 6:47

Jose Lamas Rios

29-Jun-05 6:47

I don't see it documented, but you might find something in one of these articles:

SHFileOperation always returns OK[^]

CShellFileOp - Wrapper for SHFileOperation[^]

SHFILEOPSTRUCT and the SHFileOperation[^]

In any case, I suggest you use other more documented and flexible alternatives, like CopyFileEx, MoveFileEx, etc.

--
jlr
http://jlamas.blogspot.com/[^]

help with some date/time input pls

neodeaths29-Jun-05 4:07

neodeaths

29-Jun-05 4:07

hi i am new to c++ and i would like to know how i can put date into a varieble called a
and time into a varieble called b like(DDMMYY) and (2400)

^^ me noob

Re: help with some date/time input pls

David Crow29-Jun-05 4:29

David Crow

29-Jun-05 4:29

Something like:

int a = 290605;
int b = 0929;

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: help with some date/time input pls

neodeaths29-Jun-05 4:49

neodeaths

29-Jun-05 4:49

i mean how to let the program automaticly store todays date and the current time into the varieble when the that line of code is being runed

Re: help with some date/time input pls

Ravi Bhavnani29-Jun-05 5:10

Ravi Bhavnani

29-Jun-05 5:10

See CTime() - specifically CTime::GetCurrentTime().

/ravi

My new year's resolution: 2048 x 1536
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Re: help with some date/time input pls

David Crow29-Jun-05 5:24

David Crow

29-Jun-05 5:24

Check out the time() function.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: help with some date/time input pls

neodeaths29-Jun-05 14:13

neodeaths

29-Jun-05 14:13

so do i put it this way?

#include <iostream>
using namespace std;

int time;

int main (void)
{
time = CTime();
return 0;
}
but i tryed tis and i dosnt work pls giv me an example pls

Re: help with some date/time input pls

David Crow29-Jun-05 16:58

David Crow

29-Jun-05 16:58

nneodeath wrote:
so do i put it this way?

What does the compiler say?

nneodeath wrote:
time = CTime();

CTime is an MFC class. To instantiate one, use:

CTime time;

To construct one with the current date and time, use

CTime time = CTime::GetCurrentTime();

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: help with some date/time input pls

neodeaths2-Jul-05 9:40

neodeaths

2-Jul-05 9:40

i tryed it but i doesnt really work could u please show me what i am doing wrong

#include <iostream>
using namespace std;
CTime time;

int main (void)
{
CTime time = CTime::GetCurrentTime();
cout << time << endl;
return 0;
}

this is my code pls help me correct it so that the date and time goes like this

time variebles
HHMM <==this order

date variebles
DDMMYY<==this order

Re: help with some date/time input pls

David Crow2-Jul-05 12:07

David Crow

2-Jul-05 12:07

nneodeath wrote:
cout << time << endl;

Use:

cout << time.Format("%x") << endl;

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: help with some date/time input pls

neodeaths2-Jul-05 17:50

neodeaths

2-Jul-05 17:50

#include<iostream>
using namespace std;

CTime time;

int main (void)
{
CTime time = CTime::GetCurrentTime();
//cout << time << endl;
cout << time.Format(time) << endl;
return 0;
}

the outcome:

--------------------Configuration: tiemsam - Win32 Debug--------------------
Compiling...
tiemsam.cpp
C:\Documents and Settings\nick\Desktop\currently doing cpp project\tiemsam.cpp(4) : error C2146: syntax error : missing ';' before identifier 'time'
C:\Documents and Settings\nick\Desktop\currently doing cpp project\tiemsam.cpp(4) : error C2501: 'CTime' : missing storage-class or type specifiers
C:\Documents and Settings\nick\Desktop\currently doing cpp project\tiemsam.cpp(4) : fatal error C1004: unexpected end of file found
Error executing cl.exe.

tiemsam.exe - 3 error(s), 0 warning(s)

please help me see wats the problem

Re: help with some date/time input pls

David Crow4-Jul-05 11:42

David Crow

4-Jul-05 11:42

Why do you have two CTime variables?

nneodeath wrote:
cout << time.Format(time) << endl;

This is wrong. See my previous post.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Number of bytes in a mbcs string

Chintoo72329-Jun-05 3:28

Chintoo723

29-Jun-05 3:28

how do you find the number of bytes in a multibyte string?

_mbslen and _mbstrlen return the number of characters in the string, according to: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_crt_strlen.2c_.wcslen.2c_._mbslen.2c_._mbstrlen.asp[^]

With _MBCS defined, size of TCHAR is 1 byte, so you cant even multiply _tcslen with this.

Re: Number of bytes in a mbcs string

RChin29-Jun-05 4:40

RChin

29-Jun-05 4:40

Flace wrote:
With _MBCS defined, size of TCHAR is 1 byte, so you cant even multiply _tcslen with this

I'm confused by this statement. But the number of occupied bytes in your string will be :

<br />
int nBytes = (_tcslen(pszString) * sizeof(TCHAR));<br />

The sizeof() will return the number of bytes occupied per character. This will obviously vary depending if you are working in single byte or double byte character mode.

I Dream of Absolute Zero

Re: Number of bytes in a mbcs string

Jose Lamas Rios29-Jun-05 4:41

Jose Lamas Rios

29-Jun-05 4:41

If you know you have a multibyte string, you can simply use strlen() to obtain the number of bytes.

void SomeFunction(LPSTR pString)
{
	int nChars = _mbslen(pString);
	int nBytes = strlen(pString);
	[...]
}

If you are using the TCHAR macros you can do it like this:

void SomFunction(LPTSTR pString)
{
	int nChars = _tcsclen(pString);
	int nBytes = _tcslen(pString) * sizeof(TCHAR);
}

Note _tcslen is different than _tcsclen.

If _UNICODE is not defined, _tcslen resolves to strlen, and sizeof(TCHAR)==1.
If _UNICODE is defined, _tcslen resolves to wcslen, and sizeof(TCHAR)==2.

So, _tcslen(pString) * sizeof(TCHAR) will give you the number of bytes in any case.

Hope that helps,

--
jlr
http://jlamas.blogspot.com/[^]

Re: Number of bytes in a mbcs string

Chintoo72329-Jun-05 4:54

Chintoo723

29-Jun-05 4:54

Jose Lamas Rios wrote:
If you know you have a multibyte string, you can simply use strlen() to obtain the number of bytes.

can you not have a NULL in the middle of a multi-byte string?

Jose Lamas Rios wrote:
If _UNICODE is not defined, _tcslen resolves to strlen, and sizeof(TCHAR)==1.
If _UNICODE is defined, _tcslen resolves to wcslen, and sizeof(TCHAR)==2.
So, _tcslen(pString) * sizeof(TCHAR) will give you the number of bytes in any case.

If _UNICODE is not defined, and _MBCS is defined, _tcslen resolves to _mbslen. And you know, _MBCS is defined by default in the project settings. So, _tcslen(pString) * sizeof(TCHAR) will not always give you the number of bytes all the time...

Re: Number of bytes in a mbcs string

Jose Lamas Rios29-Jun-05 5:04

Jose Lamas Rios

29-Jun-05 5:04

Flace wrote:
can you not have a NULL in the middle of a multi-byte string?

No, you can't. That's why I say strlen() works fine in this case.

Flace wrote:
If _UNICODE is not defined, and _MBCS is defined, _tcslen resolves to _mbslen

Not really. If _UNICODE is not defined, and _MBCS is defined, _tcsclen does resolve to _mbslen, but _tcslen still resolves to strlen. You can check it here:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt_strlen.2c_.wcslen.2c_._mbslen.2c_._mbstrlen.asp[^]

--
jlr
http://jlamas.blogspot.com/[^]

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