CString & char[]

[I Phil Good]

Hello,
How can i convert a char array like toto[10] into Cstring object and how can i include a LF char into CString object.
Thank you

[Dave Lorde]

char toto[10] = "123456789";
// 2 variations on the construction theme:
CString str1 = toto;
CString str2(toto);

// Add a line feed (newline) character
str1 += '\n';

// Add carriage return & line feed
str2 += "\r\n";

Dave

[Jason Teagle]

char array to CString:

CString strString = toto ;

To add an LF character:

strString += '\n';

(Note that you could store this in your char array:

strcat(toto,"\n");

and then convert to CString, if you wanted).

[I Phil Good]

is it working with unsigned char ? I've tried yesterday and it didn't work.
Can y use cstring in CFile.Read function ?
Thank for your help.

[Jason Teagle]

CString simply stores a string of characters - it does not make any difference whether they are signed or unsigned. For unsigned characters you will have to do a small cast when you access the characters. I.e.,

---
unsigned char toto[] = "Hello!";
CString strTemp ;

toto[0] = (unsigned char)0xFE ;
strTemp = toto ; // Effectively stored as signed, but it has still
// got the value (ASCII) 0xFE, it just treats it
// as -2.
printf("%d", strTemp[0]); // Generates "-2".
printf("%u", strTemp[0]); // Generates "254".

// Anywhere else you want to use the character, you should cast to
// (unsigned char).
// Note that if you use that cast in printf functions, it produces
// an unusual number; printf messes up the number and ends up with
// the DWORD form of (-2), i.e. something large. I don't know why -
// but as you can see, using "%u" with the signed version works
// correctly. Strange but true.

// Note also that CString has a [] operator, which can be used like
// an array [].


---

Yes, a CString can be used in CFile::Read(), but as a buffer only. Like this:

---
CFile filInput ;
char *pcBuffer ;
CString strBuffer ;

pcBuffer = strBuffer.GetBuffer(MAX_SIZE);
filInput.Read(pcBuffer, MAX_SIZE);
strBuffer.ReleaseBuffer(MAX_SIZE);


---

However, if you use CStdioFile, then you can use CStdioFile::ReadString(), which accepts a reference to a CString.

Does this help?