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atol 头文件 - C/C++ - 清泛网 - 专注C/C++及内核技术
...数名:atol功能: 把字符串转换成长整型数用法: longatol(const char *nptr);程序例:#include <stdlib.h> #includ...#include <stdlib.h>
函数名: atol
功 能: 把字符串转换成长整型数
用 法: long atol(const char *nptr);
实例:
#include <stdlib.h>
#include <s...
C++ 通过主机名/域名获取IP - C/C++ - 清泛网 - 专注C/C++及内核技术
...中用到Winsock API 函数，都要用到 Ws2_32.lib
void GetHostIP(char *szIPAddr)
{
WSADATA wsaData;
char name[155]; //定义用于存放获得主机名的变量
char *ip; //定义IP地址变量
PHOSTENT hostinfo;
//调用MAKEWORD()获得Winsocl版本的正确值...
std::stringstream ss; 直接使用ss.str().c_str() 字符串指针可能导致崩溃 ...
....str().c_str() 字符串指针可能导致崩溃std::stringstream ss;const char* ch = ss str() c_str();call_func(ch);这种写法在系统内存不足时，ss会立马释放内存，字符串指针ch可能会非法访问导致崩溃。代码最好的是
std::stringstream ss;
const char* ch = ss...
boost库编译问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ee::xml_writer_settings<std::string> settings(' t', 1, "GB2312");报错：char不能转换为std::string。1.5...boost::property_tree::xml_writer_settings<std::string> settings('\t', 1, "GB2312");
报错：char不能转换为std::string。
1.54 版本 报错，改为boost::property_tree::xml_wr...
VC/Linux C++ 递归访问目录下所有文件 - c++1y / stl - 清泛IT社区，为创新赋能！
VC函数，部分代码如下：find(char * lpPath)
{
char szFind[MAX_PATH];
WIN32_FIND_DATA FindFileData;
strcpy(szFind,lpPath);
strcat(szFind,"\\*.*");
HANDLE hFind=::FindFirstFile(szFind,&FindFileData);
&...
Do I cast the result of malloc?
...ther points are also trivial, if you use the variable in your malloc call: char **foo = malloc(3*sizeof(*foo)); if quite full-proof: 3 pointers to char pointers. then loop, and do foo[i] = calloc(101, sizeof(*(foo[i])));. Allocate array of 101 chars, neatly initialized to zeroes. No cast needed. cha...
Make a float only show two decimal places
...
IN objective-c, if you are dealing with regular char arrays (instead of pointers to NSString) you could also use:
printf("%.02f", your_float_var);
OTOH, if what you want is to store that value on a char array you could use:
sprintf(your_char_ptr, "%.02f", your_float_va...
What are transparent comparators?
...ast, works for std::string which has overloaded less than operators taking char const* as argument. Since these function objects are also new, even if they do the wrong thing (i.e. require a conversion for some type) it would, at least, not be a silent change resulting in a performance degradation.
...
alternatives to REPLACE on a text or ntext datatype
...g SQL Server 2005/2008, you can use the following code (taken from here):
select cast(replace(cast(myntext as nvarchar(max)),'find','replace') as ntext)
from myntexttable
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How do I do a case-insensitive string comparison?
... Greek letters is not the only special case! In U.S. English, the character "i" (\u0069) is the lowercase version of the character "I" (\u0049). However, the Turkish ("tr-TR") alphabet includes an "I with a dot" character "İ" (\u0130), which is the capital version of "i" and "I" is the cap...