02-17-2009
Hi,
const char *buffer does not mean that buffer is a constant. It only says buffer points to a constant char. To declare buffer as a constant, you will have give,
char * const buffer;
Here in your code, you cannot give
char *b
sprintf(b,"result.txt");
Either you have to allocate memory to b and then use sprintf or strcpy or you can use,
b="result.txt";
To append something to buffer, you dont want to concatinate the new string with buffer, you may append the string to the array buffer points to. You cannot give strcat(buffer,b) as strcat does not allow const char * as its first argument.
You may try this
char b[1024]={"result.txt"}; //You may try dynamic allocation also
const char *buffer=b;
cout<<"\n Value of buffer 1 : "<<buffer<<endl; //It will be result.txt
strcat(b,",result1.txt");
cout<<"\n Value of buffer 2 : "<<buffer<<endl; //It will be result.txt,result1.txt
.
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LEARN ABOUT DEBIAN
curl_msprintf
curl_printf(3) libcurl Manual curl_printf(3)
NAME
curl_maprintf, curl_mfprintf, curl_mprintf, curl_msnprintf, curl_msprintf curl_mvaprintf, curl_mvfprintf, curl_mvprintf, curl_mvsnprintf,
curl_mvsprintf - formatted output conversion
SYNOPSIS
#include <curl/mprintf.h>
int curl_mprintf(const char *format, ...);
int curl_mfprintf(FILE *fd, const char *format, ...);
int curl_msprintf(char *buffer, const char *format, ...);
int curl_msnprintf(char *buffer, size_t maxlength, const char *format, ...);
int curl_mvprintf(const char *format, va_list args);
int curl_mvfprintf(FILE *fd, const char *format, va_list args);
int curl_mvsprintf(char *buffer, const char *format, va_list args);
int curl_mvsnprintf(char *buffer, size_t maxlength, const char *format, va_list args);
char *curl_maprintf(const char *format, ...);
char *curl_mvaprintf(const char *format, va_list args);
DESCRIPTION
These are all functions that produce output according to a format string and given arguments. These are mostly clones of the well-known C-
style functions and there will be no detailed explanation of all available formatting rules and usage here.
See this table for notable exceptions.
curl_mprintf()
Normal printf() clone.
curl_mfprintf()
Normal fprintf() clone.
curl_msprintf()
Normal sprintf() clone.
curl_msnprintf()
snprintf() clone. Many systems don't have this. It is just like sprintf but with an extra argument after the buffer that
specifies the length of the target buffer.
curl_mvprintf()
Normal vprintf() clone.
curl_mvfprintf()
Normal vfprintf() clone.
curl_mvsprintf()
Normal vsprintf() clone.
curl_mvsnprintf()
vsnprintf() clone. Many systems don't have this. It is just like vsprintf but with an extra argument after the buffer that
specifies the length of the target buffer.
curl_maprintf()
Like printf() but returns the output string as a malloc()ed string. The returned string must be free()ed by the receiver.
curl_mvaprintf()
Like curl_maprintf() but takes a va_list pointer argument instead of a variable amount of arguments.
To easily use all these cloned functions instead of the normal ones, #define _MPRINTF_REPLACE before you include the <curl/mprintf.h> file.
Then all the normal names like printf, fprintf, sprintf etc will use the curl-functions instead.
AVAILABILITY
These function will be removed from the public libcurl API in a near future. They will instead be made "available" by source code access
only, and then as curlx_-prefixed functions. See lib/README.curlx for further details.
RETURN VALUE
The curl_maprintf and curl_mvaprintf functions return a pointer to a newly allocated string, or NULL if it failed.
All other functions return the number of characters they actually outputted.
SEE ALSO
printf(3), sprintf(3), fprintf(3), vprintf(3)
libcurl 7.12 30 April 2004 curl_printf(3)