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sizeof、strlen简单总结 - C/C++ - 清泛IT论坛，有思想、有深度
sizeof strlen const char* p 4 字符串长度 std::string 4 字符串长度 "......" 字符串长度+1 ('\0') 字符串长度
Linux C/C++进程单实例互斥代码分享 - C/C++ - 清泛网 - 专注C/C++及内核技术
...xit(1);
}
}
// 锁定文件后，将该进程的pid写入文件
char buf[16] = {};
sprintf(buf, "%d", getpid());
ftruncate(fd, 0);
ret = write(fd, buf, strlen(buf));
if (ret < 0) {
printf("Write file failed, file: %s, error: %s\n", kPidFileName, strerror(errno));
close(fd);
...
【解决】double free or corruption (!prev) - C/C++ - 清泛网 - 专注C/C++及内核技术
...大小，在free的时候也会检测出来，报这个错误，如：
char* buf = malloc(5);
memcpy(buf, "123456", 6);
free(buf); //free时报此错误
实际项目中可能此类问题没法直观定位到，推荐使用gcc自带的 asan 检查内存错误。
asan 内存跟踪
libunwind：记录程序崩溃堆栈 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...all
记录堆栈的代码如下：
static void log_backtrace(void) {
char name[256];
unw_cursor_t cursor;
unw_context_t uc;
unw_word_t ip, sp, offp;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
syslog(LOG_ERR, "--illegal memory access--");
while(unw_step(&cursor) > 0) {...
split string only on first instance - java
I want to split a string by '=' charecter. But I want it to split on first instance only. How can I do that ? Here is a JavaScript example for '_' char but it doesn't work for me
split string only on first instance of specified character
...
Escape double quote character in XML
Is there an escape character for a double quote in xml? I want to write a tag like:
8 Answers
...
Get folder name from full file path
...s\roott\wsdlproj\devlop\beta2\text";
string lastDirectory = path.Split(new char[] { System.IO.Path.DirectorySeparatorChar }, StringSplitOptions.RemoveEmptyEntries).Last();
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How to use `string.startsWith()` method ignoring the case?
... really will do a toUpperCase in a 1mb String just to compare 4-10 inicial characters?
– Dyorgio
Apr 7 '16 at 16:52
...
The simplest way to comma-delimit a list?
....
The StringJoiner class.
Example:
// Util method for strings and other char sequences
List<String> strs = Arrays.asList("1", "2", "3");
String listStr1 = String.join(",", strs);
// For any type using streams and collectors
List<Object> objs = Arrays.asList(1, 2, 3);
String listStr2 ...
How to check if my string is equal to null?
...mpty, false otherwise
return myString.isEmpty() // Returns `true` if this char sequence is empty (contains no characters), false otherwise
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