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How to use shared memory with Linux in C
...mory.
#include <string.h>
#include <unistd.h>
int main() {
char parent_message[] = "hello"; // parent process will write this message
char child_message[] = "goodbye"; // child process will then write this one
void* shmem = create_shared_memory(128);
memcpy(shmem, parent_mes...
How to check if character is a letter in Javascript?
I am extracting a character in a Javascript string with:
14 Answers
14
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__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术
...数，其功能类似于printf：
//m=1；n=2
extern void myprint(const char *format,...) __attribute__((format(printf,1,2)));
//m=2；n=3
extern void myprint(int l，const char *format,...)
__attribute__((format(printf,2,3)));
需要特别注意的是，如果myprint是一个函数的成员...
My attempt at value initialization is interpreted as a function declaration, and why doesn't A a(())
...t of all, there is C. In C, A a() is function declaration. For example, putchar has the following declaration. Normally, such declarations are stored in header files, however nothing stops you from writing them manually, if you know how the declaration of function looks like. The argument names are ...
MD5 algorithm in Objective-C
...cess
@implementation NSString (MyAdditions)
- (NSString *)md5
{
const char *cStr = [self UTF8String];
unsigned char result[CC_MD5_DIGEST_LENGTH];
CC_MD5( cStr, (int)strlen(cStr), result ); // This is the md5 call
return [NSString stringWithFormat:
@"%02x%02x%02x%02x%02x%02x%...
How do ports work with IPv6?
Conventional IPv4 dotted quad notation separates the address from the port with a colon, as in this example of a webserver on the loopback interface:
...
hash function for string
... had nice results with djb2 by Dan Bernstein.
unsigned long
hash(unsigned char *str)
{
unsigned long hash = 5381;
int c;
while (c = *str++)
hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
return hash;
}
...
How to install Android SDK Build Tools on the command line?
...a stands for --all and -t stands for --filter.
If you need to install multiple packages do:
android update sdk -u -a -t 1,2,3,4,..,n
Where 1,2,..,n is the package number listed with the list command above
share
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C++ Convert string (or char*) to wstring (or wchar_t*)
...nclude <string>
std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
std::string narrow = converter.to_bytes(wide_utf16_source_string);
std::wstring wide = converter.from_bytes(narrow_utf8_source_string);
Longer online compilable and runnable example:
(They all sho...
Practical non-image based CAPTCHA approaches?
...rflow. This is necessary to prevent bots, spammers, and other malicious scripted activity. We only want human beings to post or edit things here!
...