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C语言判断文件是否存在 - C/C++ - 清泛网 - 专注C/C++及内核技术

...件属性: 06 检查读写权限 04 检查读权限 02 检查写权限 01 检查执行权限 00 检查文件的存在性 在UNIX和VC下实验成功。相比fopen(..,"r")当没有读取权限时不适用,而这个就算这个文件没有读权限,也可...
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c++ 写日志通用类,可设置日志级别 - C/C++ - 清泛网 - 专注C/C++及内核技术

...96) #define LEVEL_FATAL 0 #define LEVEL_ERROR 1 #define LEVEL_WARN 2 #define LEVEL_INFO 3 #define LEVEL_VERBOSE 4 #define LEVEL_DEBUG 5 static int nLoggerLevel = LEVEL_INFO; void SetLoggerLevel(int nLevel); void Log(int nLevel, LPCSTR func, INT line, LPCTSTR fmt, ...); static co...
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Linux automake自动编译全攻略 - C/C++ - 清泛网 - 专注C/C++及内核技术

...ib/calc.h" int main(int argc, char** argv) { int sum = add(1, 2); printf("sum:%d\n", sum); return 0; } 编译及执行结果: 执行: 代码点此下载:automake.zip Linux automake 自动编译
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c/c++取结构体指定成员的偏移,及原理解析 - C/C++ - 清泛网 - 专注C/C++及内核技术

...0)->m )) 原理如下: 1、0即空指针转换结构体空指针。 2、拿结构体中的指定成员的地址即为我们要找的偏移,因为首地址为空,因此成员地址相对0来说即为相对偏移。 offsetof
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c++ 经典的快速排序QuickSort完整代码片 - 开源 & Github - 清泛网 - 专注C/C++及内核技术

...) { int i = low; int j = high; int pivot = array[(i + j) / 2]; int temp; while (i <= j) { while (array[i] < pivot) i++; while (array[j] > pivot) j--; if (i <= j) { temp = array[i]; ...
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PHP常用API函数用法 - 更多技术 - 清泛网 - 专注C/C++及内核技术

..."https://www.tsingfun.com/index.php?m=content&c=content&a=edit&catid=37&id=289&pc_hash=c6svGs"; $params = explode('&', $url); print_r($params); ?> 结果: Array ( [0] => https://www.tsingfun.com/index.php?m=content [1] => c=content [2] => a=edit [3] => catid=37 [4] => id=289 [...
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实例演示SimpleXMLElement的用法 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...ses-sdk android:minSdkVersion="1" /> <uses-sdk android:maxSdkVersion="2" /> <uses-permission android:name="android.permission.FOO"></uses-permission> <uses-permission android:name="android.permission.BAR"></uses-permission> </manifest> BTW:APK软件中的AndroidManifest.xml文档...
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Linux automake自动编译全攻略 - 脚本技术 - 清泛IT社区,为创新赋能!

...rgc, char** argv) { &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;int sum = add(1, 2); &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;printf(&quot;sum:%d\n&quot;, sum); &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;return 0; }复制代码 编译及执行结果: 执行: ...
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Ruby, !! operator (a/k/a the double-bang) [duplicate]

... answered Oct 22 '10 at 5:07 icktoofayicktoofay 114k1717 gold badges222222 silver badges220220 bronze badges ...
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What is the proper way to check for null values?

... a comment instead. – Jon Skeet Mar 22 '12 at 15:11  |  show 3 more comments ...