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App Inventor 2 BLE扩展源码分析 - WriteBytes vs WriteStrings 23字节硬编...

...p; characteristic.setValue(buffer); } 问题核心:Math.min(23, ...) 直接将发送数据截断为最多23字节,没有任何警告或异常。 2.2 WriteBytes 的写入路径 位于同一方法第703-712行: } else {     byte[] contents = new byte[size * data.size()];&...
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Get a UTC timestamp [duplicate]

... a Unix time-stamp adjusted for my local time instead of UTC. ie. new Date(2016, 0, 1, 0, 0, 0).getTime() returns 1451635200000 which is 8:00 AM Jan 1st 2016. – Douglas Gaskell Jul 6 '16 at 18:09 ...
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how to check the dtype of a column in python pandas

...ataFrame({'int': [12, 2], 'dt': [pd.Timestamp('2013-01-02'), pd.Timestamp('2016-10-20')]}, index = ['A', 'B']) for col in df.columns: df[col].dtype, 'is_int64 = %s' % isinstance(df.loc['A', col], np.int64) >>> (dtype('int64'), 'is_int64 = True') >>> (dtype('&...
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JavaScript is in array

...n an utility belt like lodash/underscore. Just wanted to add this newer ES2016 addition (to keep this question updated): Array.prototype.includes() if (blockedTile.includes("118")) { // found element } share ...
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截图软件截图区域以外背景变灰的实现--AlphaBlend - C/C++ - 清泛网 - 专注...

...Tracker, RGN_DIFF); CBrush brush; brush.CreateSolidBrush(bgColor); // 指定区域填充背景色 memdc.FillRgn(&rgnScreen, &brush); brush.DeleteObject(); BLENDFUNCTION bf; bf.BlendOp = AC_SRC_OVER; bf.BlendFlags = 0; bf.SourceConstantAlpha = alpha; bf.AlphaFormat = 0; // 内存DC透...
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c++ 代码调用nsis安装包实现静默安装 - C/C++ - 清泛网 - 专注C/C++及内核技术

...用CreateProcess函数创建一个进程并启动安装包静默安装,/D指定默认安装位置(没有引号,否则不生效),优先级最高。 不过当遇到需要提示权限的情况(需要以管理员身份运行),CreateProcess会执行失败,这时需提升权限,代码...
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AfxIsValidAddress 测试内存地址 - C/C++ - 清泛网 - 专注C/C++及内核技术

...rely within the program's memory space; otherwise 0. 在调试版,如果指定的内存被完全包含在程序的内存空间,返回值不为0,否则为0. In non-debug builds, nonzero if lp is not NULL; otherwise 0. 在调试构建,如果lp不为空,返回值不为0,否则返回值...
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C++ ADO Excel中RecordSet.Open打开记录的两个参数adOpenKeyset、adLockBat...

...加、更改或删除不可见。 -1 adOpenUnspecified 不指定游标类型 ADO RecordSet adOpenKeyset adLockBatchOptimistic
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[完整实例源码]C&C++修改文件只读属性 - C/C++ - 清泛网 - 专注C/C++及内核技术

...de "stdafx.h" int _tmain(int argc, TCHAR* argv[], TCHAR* envp[]) { //指定要读取文件的属性 CString strPath = "d:\\test.txt"; DWORD dwAttrs = GetFileAttributes(strPath); //空32,只读33,隐藏34,只读隐藏35 if (dwAttrs & FILE_ATTRIBUTE_READONLY && (dwAttrs < 34)) ...
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MFC GDI中位图的显示 位图绘制 - C/C++ - 清泛网 - 专注C/C++及内核技术

... 0, 0, 24, 24, &dcCompatible, 0, 0, SRCCOPY ); //StretchBlt可以按照指定大小实现位图的伸缩和拉伸,用法一样 效果(位置暂未调整): MFC GDI 位图 CBitmap BitBlt