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How to install PyQt4 on Windows using pip?

... In the filenames cp27 means C-python version 2.7, cp35 means python 3.5, etc. Since Qt is a more complicated system with a compiled C++ codebase underlying the python interface it provides you, it can be more complex to build than just a pure python code package, which means it can be hard to ins...
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What is the best way to create constants in Objective-C

...stants. Things like serial identifier numbers, bit-masks, four-byte codes, etc. For those purposes, enum is great and you absolutely should use it. (Even better, use the NS_ENUM and NS_OPTIONS macros.) For other things, you must use something else; enum does not do anything but integers. And other...
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Pick a random element from an array

...l the scalar data types you might want expect: Int, Double, Float, UInt32, etc. And it lets you provide target ranges for the values. Very handy. You can use array[Int.random(0..<array.count)]` in Swift 4.2 – Duncan C Sep 19 '18 at 18:30 ...
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WiX tricks and tips

... (except Config.wxi) from existing project. Create Setup.Live, Setup.Test, etc as per normal wixproj. Add BeforeBuild target in wixproj in Setup.Live, etc to perform MSBuild Community Task FileUpdate to modify Guids (I used A for Live, B for Test and C for training) Add AfterBuild target to revert C...
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Windows应用程序异常:异常代码: 0xc0000005 - C/C++ - 清泛网 - 专注C/C++及内核技术

...溃,没有留下任何痕迹,追踪困难。这时可以打开Windows应用程序日志,查看崩溃信息。操作方法,我电脑右键管理:错 有时应用程序异常崩溃,没有留下任何痕迹,追踪困难。这时可以打开Windows应用程序日志,查看崩...
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stl 字符串std::string作为std::map主键key实例 - C/C++ - 清泛网 - 专注C/C++及内核技术

stl 字符串std::string作为std::map主键key实例本文通过一个实例介绍std::map字符串作为key常见用法,并使用find_if实现map按value值查找。代码如下: #include <map> #include <string> #include <algorithm> using namespace std; class map_value_finder {...
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js页面跳转window.location.href很多浏览器不支持解决方法 - C/C++ - 清...

js页面跳转window.location.href很多浏览器不支持解决方法在js里用window.location.href("xxxxx");来实现页面直接跳转功能。如:window.location.href(" index.html");IE内核浏览器木有问题。火狐...在js里用window.location.href("xxxxx");来实现页面直...
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php array为空判断 - C/C++ - 清泛网 - 专注C/C++及内核技术

php array为空判断如何判断PHP数组是否为空PHP判断数组为空首选方法:count($arr),size($arr);$arr= array("");echo count($arr);echo size($arr); 输出1...如何判断PHP数组是否为空 PHP判断数组为空首选方法:count($arr), size($arr); $arr= array(""); ec...
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C++在堆上申请二维数组 - C/C++ - 清泛网 - 专注C/C++及内核技术

C++在堆上申请二维数组假设要申请是double型大小m*n数组有如下方法方法一:优点:申请空间是连续 缺点:较难理解double (*d)[n] = new double[m][n]复...假设要申请是double型大小m*n数组 有如下方法 方法一:优点:申请空...
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高效使用STL容器小tip - C/C++ - 清泛网 - 专注C/C++及内核技术

高效使用STL容器小tip高效使用STL容器前提是不要以一种愚蠢方式去写代码,比如在循环里边每次都检查size()是不是0,每次都浪费线性时间。 看下边例子:...高效使用STL容器前提是不要以一种愚蠢方式去写代码,比如...