Thank eleven.
I am using CString for containing "#20C0FF" in MFC.
How to convert that?
Thanks,
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MFC
I have a string which contain a color : #20C0FF
How can I convert this string to type COLORREF ?
Thanks,
Lovenet
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Answers
what exactly is the error message?
//if CString contains ANSI chars:
std::string str( cstrng.GetBuffer(8) );
cstring.ReleaseBuffer() ;
std::istringstream stm(str) ;
char c ; COLORREF clr ;
stm >> c >> std::hex >> clr ; // if string has colorref value
//if CString contains UNICODE chars:
std::wstring wstr( cstrng.GetBuffer(8) );
cstring.ReleaseBuffer() ;
std::wistringstream stm(wstr) ;
char c ; COLORREF clr ;
stm >> c >> std::hex >> clr ; // if string has colorref value
You could try this to extract the RGB values
string str = "#b235ff";
const char *s1 = str.c_str() + 5;
int l=0;
if( *s1 >= 0x30 && *s1 <= 0x39 )
l = *s1 & 0x0f;
else
l = (*s1 & 0x0f) + 9;
printf("Red %d\n", l );
s1 = str.c_str() + 3;
l=0;
if( *s1 >= 0x30 && *s1 <= 0x39 )
l = *s1 & 0x0f;
else
l = (*s1 & 0x0f) + 9;
printf("Green %d\n", l );
s1 = str.c_str() + 1;
l=0;
if( *s1 >= 0x30 && *s1 <= 0x39 )
l = *s1 & 0x0f;
else
l = (*s1 & 0x0f) + 9;
printf("Blue %d\n", l );
Best Regards,
DeepuAbrahamK
>>>> use CString::GetBuffer(int) to retrieve the buffer;
No, CString has a built-in cast operator to const char*, you don't need the GetBuffer which makes a writeable buffer.
// case not UNICODE
CString color = "#20C0FF" ;
std::istringstream stm((const char*)color) ; // here the cast operator applies
char c ; COLORREF clr ;
stm >> c >> std::hex >> clr ; // if string has colorref value
int r, g, b ;
stm >> c >> hex >> std::setw(2) >> r >> std::setw(2) >> g >> std::setw(2) >> b ;
clr = RGB(r,g,b) ; // if string has rgb values
Same is for UNICODE CStrings where the cast operator turns a CString to a const wchar_t*.
>>>> I tried but it is noticed error ???
You need
#include <sstream>
#include <iomanip>
to compile the code snippet.
Regards, Alex
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by: eleven_squaredPosted on 2007-05-27 at 07:57:55ID: 19164430
std::string color = "#20C0FF" ;
std::istringstream stm(color) ;
char c ; COLORREF clr ;
stm >> c >> std::hex >> clr ; // if string has colorref value
int r, g, b ;
stm >> c >> hex >> std::setw(2) >> r >> std::setw(2) >> g >> std::setw(2) >> b ;
clr = RGB(r,g,b) ; // if string has rgb values