double to CString and back

Desmo16

Hi all, I need to convert text from an edit control to double in an MFC application. I also need to convert a double into a CString to display it in an edit box. How can i do that ? Thanx in advance, Desmo16.

see me

You can use For Double to CString CString Format function CString to Double double atof(const char *string ); See msdn once before posting a question Dream bigger... Do bigger...Expect smaller aji

Naveen

1.CString to double use atof() 2. Double to CString. use CString::Format() funtion. nave

stefanmihaimoga

You could use atof, _atof_l, _wtof, _wtof_l[^] functions for your own needs. Good luck and good day!

Hamid Taebi

See

char *Char; 
double Double;
   Char = " -1234.56";
   Double = atof( Char );
   CString str;
   str.Format("%lf",Double);

_**

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whitesky

Desmo16

If i've got a char vector ( example: char name[30]), and i want to convert it into a CString, is there a way to do that ?

toxcct

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

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ] -- modified at 11:12 Wednesday 19th July, 2006

Zac Howland

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

toxcct

i know i know, i fixed with strcpy() thanks BTW

TOXCCT >>> GEII power

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

Zac Howland

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

toxcct

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! ]

Roland Pibinger

Its meCString to Double double atof(const char *string )

If you want error handling use strtod and check return value, errno and end-pointer. :(