C / C++ / MFC

Re: double to CString and back

19-Jul-06 3:40

char name[30] = "hello you";
CString str = name;
char name2[30];
strncpy(name2, str, sizeof(name2));

TOXCCT >>> GEII power

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-- modified at 11:12 Wednesday 19th July, 2006

Zac Howland19-Jul-06 4:32

Zac Howland

19-Jul-06 4:32

toxcct wrote:

char name[30] = "hello you";
CString str = name;
char name2 = str;

char name[30] = "hello you";		// ok
CString str = name;				// ok
char name2 = str;				// not good

char name2 = str[0]; is fine, or char* name2 = str.GetBuffer(), but not the other.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: double to CString and back

toxcct19-Jul-06 4:46

Re: double to CString and back [modified]

19-Jul-06 4:46

i know i know, i fixed with strcpy()

thanks BTW

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Zac Howland19-Jul-06 4:55

Zac Howland

19-Jul-06 4:55

toxcct wrote:
char name2;
strcpy(name2, str);

That still won't compile. You'd have to write it like so:

char name2;
strcpy(&name2, str);

Which is VERY BAD. Since strcpy doesn't check for proper lengths on the source array, it will just start writing to memory at the address (which is the address of a single character) and keep going until its done. That is, it will overwrite at least 1 character in memory that is not allocated for name2 if str is anything but an empty string. I believe what you wanted to show was:

char name2[30] = {0};
strcpy(name2, str);

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

-- modified at 10:56 Wednesday 19th July, 2006

Re: double to CString and back

toxcct19-Jul-06 5:00

GDI+ and Zooming on the picture ...

19-Jul-06 5:00

oops, i was meaning char[30], not only char. and to ensure the length of data copied, strncpy() is the function to use...

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Hadi Rezaee19-Jul-06 0:22

Hadi Rezaee

19-Jul-06 0:22

Hi,

I load an image and simply display it ..
How can i Zoom on the area of the picture ?!

I can zoom Smile | :)

right now i zoom on the picture with using bigger rect of my source image and just displaying it ...

Is there any technic or special method in GDI+ ?!

I need Faster drawing Big Grin | :-D

Finding if the target platform supports 64 bit Arithmetic

ComplexLifeForm19-Jul-06 0:19

ComplexLifeForm

19-Jul-06 0:19

Hi Friends,

How do I find out if the target platform supports 64 bit Arithmetic or not?
I will also like to know about finding if the target platform is Little Endian or Big Endian.

Are ther some compiler switches which help to determine these. The code is mostly C++ code but it needs to be compiled for different platforms.

Thanks in Advance.

Regards.

Re: Finding if the target platform supports 64 bit Arithmetic

Steve S19-Jul-06 1:39

Steve S

19-Jul-06 1:39

Well, VC6++ includes __int64, so you could check

#if defined(_MSC_VER)
#if _MSC_VER >= 1200
// Yup, it's VC6 or later
#endif
#endif

There are different processor type macros, such as _M_IX86 which you can use to determine that it's compiling for X86. There are similar ones supported by (for instance) the ARM compiler for Windows Embedded.

What you need to do is look at the predefined macros like this for each of the compilers you're using for different platforms.

Steve S
Developer for hire

Re: Finding if the target platform supports 64 bit Arithmetic

C^hris L^osinger19-Jul-06 1:41

C^hris L^osinger

19-Jul-06 1:41

How do I find out if the target platform supports 64 bit Arithmetic or not

that depends mostly on the compiler. even machines that don't support 64 instructions in hardware can support it in software. ex.: __int64 i; will work wherever MS's C/C++ compiler works.

psychedelic_fur wrote:
I will also like to know about finding if the target platform is Little Endian or Big Endian.

int tst=1;
if (((char*)tst)[0])
        printf("Low endian");
else
        printf("High endian");

Do the chickens have large talons?

vs c++

jitenderbansal18-Jul-06 23:54

jitenderbansal

18-Jul-06 23:54

how to read and write in file in case of vs 6.0

toxcct18-Jul-06 23:56

18-Jul-06 23:56

use STL :

std::ifstream and std::ofstream are what you're looking for, in case of C++, fopen(), fread(), fwrite(), fscanf(), fprintf(), fclose() otherwise

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

see me19-Jul-06 0:07

19-Jul-06 0:07

Hi TOXCCT,

I want to create a cpp file template through MFC application. If i specified the class name( TestClass ) the application will automatically create the file TestClass.cpp with some codes like

#include TestClass.h
.
.
.
TestClass::TestClass()
{
}
.
.
.
someComments...etc.

if i want to do the same method or any other method is there???? D'Oh! | :doh:

Dream bigger... Do bigger...Expect smaller
aji

toxcct19-Jul-06 0:11

19-Jul-06 0:11

Its meI want to

hey, YOU want, of jitenderbansal wants ??? OMG | :OMG:

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

see me19-Jul-06 0:22

19-Jul-06 0:22

if u kno, then please tel me, whether there is any other way to create cpp files

Dream bigger... Do bigger...Expect smaller
aji

toxcct19-Jul-06 0:24

19-Jul-06 0:24

Its meif u kno, then please tel me,

i won't, as far as i don't understand your request...

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

see me19-Jul-06 0:34

19-Jul-06 0:34

No problem....

i will use the CFile to create it.

Dream bigger... Do bigger...Expect smaller
aji

see me19-Jul-06 0:23

19-Jul-06 0:23

yes...i also need it

Dream bigger... Do bigger...Expect smaller
aji

sunit519-Jul-06 0:01

sunit5

19-Jul-06 0:01

if u r using MFC u can use CFile

never say die

_AnsHUMAN_ 19-Jul-06 0:21

_AnsHUMAN_

19-Jul-06 0:21

fread and fwrite

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

see me19-Jul-06 0:31

19-Jul-06 0:31

hey, this is already told by toxcct in better way....then y u reapeating the same one???? Dead | X|

If have any other idea then please tel it

Dream bigger... Do bigger...Expect smaller
aji

Ștefan-Mihai MOGA19-Jul-06 0:35

Ștefan-Mihai MOGA

19-Jul-06 0:35

You could use standard CFile/CStdioFile classes to read/write from/to files.
Here's a good example - Johan Rosengren's CTextFile: A handy helper[^]

push n pop matrix

ooola rocks18-Jul-06 23:22

ooola rocks

18-Jul-06 23:22

Hi,
When 2 use glPushmatrix() and glPopMatrix() functions

When the goin gets tough then tough gets going

Re: push n pop matrix

toxcct18-Jul-06 23:54