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如何获取控件的值？ - C++ UI - 清泛IT社区，为创新赋能！
最简单直观的：
CString str;
GetDlgItemText(IDC_EDIT_TEST, str);
int d=atoi(str.GetBuffer(0));
更优雅的：
.h：int m_editTest;
.cpp：
void CxxDlg::DoDataExchange(CDataExchange* pDX)
{
DDX_Text(pDX, IDC_EDIT_TEST, m_editTest);
}
这样就绑定了控件和一...
C++ SpinLock 自旋锁的代码实现（全网最简略的方式） - C/C++ - 清泛网 - ...
...:f_(ATOMIC_FLAG_INIT) {}
virtual ~SpinLock() {}
void lock() { while(f_.test_and_set(memory_order_acquire)); }
void unlock() { f_.clear(memory_order_release); }
};
2、有退避策略的自旋锁，尝试一定次数(65535)失败后让出线程调度权：
class SpinLockWithYield {
ato...
App Inventor 2 实现上传文件到服务器全方案总结 · App Inventor 2 中文网
...制流保存为图片
img = request.get_data()
with open("test.png", "wb") as f:
f.write(img)
return 0
# 后面的路径可以自己定义
api.add_resource(receive_pic,'/test')
if __name__ == '__main__':
app_port = 8081
app.run(host="0.0.0.0", po...
使用模拟器构建应用程序 · App Inventor 2 中文网
...ntor includes an emulator for the phone. The emulator lets you develop and test apps using a virtual phone instead of a real phone. Instead of connecting a phone to the USB port, just start the emulator program. When you click Connect to Phone in the Blocks Editor, your app will appear in the emulat...
App Inventor 2 AsciiConversion 拓展，ASCII编码与解码，Ascii码转换 · App Inventor 2 中文网
...
.aix 拓展下载：
AsciiConversion.aix
demo程序下载：
test_AsciiConversion.aia
此扩展允许用户将 Ascii 代码(列表)转换为相应的文本，也可以将指定的字符转换为相应的 Ascii 代码。
此扩展提供 3个 函数：
AsciiCode: 给出字符，返...
“当屏幕1.关闭其他屏幕时”这个事件是怎么触发的？ - App Inventor 2 中文...
...，如Screen1的事件代码如下：
当Screen1跳转到屏幕"test"时，屏幕"test"调用“关闭屏幕并返回值”方法后，上面的事件就会触发，代码如下：
事件触发后的测试结果，Screen1打印出了关闭前的屏幕名称及关闭时...
How do you calculate the average of a set of circular data? [closed]
...
{
//get average for a segment based on minimum
double testAverageAngle = (sumAngles + 360*i)/_angles.length;
//minimum is outside segment range (therefore not directly relevant)
//since it is greater than lowerAngles[i], the minimum for the segment
//must...
detach all packages while working in R
...,sep=""),detach,character.only=TRUE,unload=TRUE)
(edit: 6-28-19)
In the latest version of R 3.6.0 please use instead.
invisible(lapply(paste0('package:', names(sessionInfo()$otherPkgs)), detach, character.only=TRUE, unload=TRUE))
Note the use of invisible(*) is not necessary but can be useful to p...
What is the gain from declaring a method as static
...s do not integrate well into an object oriented language and also, hard to test properly. This is the reason why some newer languages forego the concept of static methods/variables altogether, or try to internalize it into the language in a way that plays better with OO (eg Objects in Scala).
Most ...
Why does sun.misc.Unsafe exist, and how can it be used in the real world?
...xception in the Dynamic Implementation of the Interface.
import org.junit.Test;
/** need to allow forbidden references! */ import sun.misc.Unsafe;
/**
* Demonstrate how to throw an undeclared checked exception.
* This is a hack, because it uses the forbidden Class {@link sun.misc.Unsafe}.
*/
pu...