我想要一个具有以下属性的计时器:
无论启动多少次调用,只有一个回调线程正在运行
关于间隔,忽略了在回调函数中花费的时间.例如,如果间隔为100毫秒并且回调需要4000毫秒才能执行,则回调将在100毫秒,4100毫秒等时调用.
我看不到任何可用的内容,所以写了下面的代码.有一个更好的方法吗?
/**
* Will ensure that only one thread is ever in the callback
*/
public class SingleThreadedTimer : Timer
{
protected static readonly object InstanceLock = new object();
//used to check whether timer has been disposed while in call back
protected bool running = false;
virtual new public void Start()
{
lock (InstanceLock)
{
this.AutoReset = false;
this.Elapsed -= new ElapsedEventHandler(SingleThreadedTimer_Elapsed);
this.Elapsed += new ElapsedEventHandler(SingleThreadedTimer_Elapsed);
this.running = true;
base.Start();
}
}
virtual public void SingleThreadedTimer_Elapsed(object sender, …Run Code Online (Sandbox Code Playgroud) 我们在c#中有一段代码,它在AVG的启发式行为检测下被识别为病毒.我们一直与他们联系,以找出原因,但他们没有回应.目前我们所有的dll和exe都是用我们生成的证书签署的(不会在受信任的商店中)是否有人知道我们是否购买了代码签名证书是否有助于解决误报?
我正在寻找的逻辑是,如果其中一个数字> = 0(它们不一定是),那么返回两个中的最小值也大于0.我为它编写的代码是如此丑陋,我很惭愧发布它!
编辑:样品1,-1 => 15,6 => 5 -1,-1 => 0
(如果两者都小于0,则返回0)
我正在编写一些测试代码来模拟非托管代码,调用后期绑定COM对象的c#实现.我有一个声明为IDispatch类型的接口,如下所示.
[Guid("2D570F11-4BD8-40e7-BF14-38772063AAF0")]
[InterfaceType(ComInterfaceType.InterfaceIsDual)]
public interface TestInterface
{
int Test();
}
[ClassInterface(ClassInterfaceType.AutoDual)]
public class TestImpl : TestInterface
{
...
}
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当我使用下面的代码调用IDispatch的GetIDsOfNames函数时
..
//code provided by Hans Passant
Object so = Activator.CreateInstance(Type.GetTypeFromProgID("ProgID.Test"));
string[] rgsNames = new string[1];
int[] rgDispId = new int[1];
rgsNames[0] = "Test";
//the next line throws an exception
IDispatch disp = (IDispatch)so;
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IDispatch定义为:
//code provided by Hans Passant
[ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("00020400-0000-0000-C000-000000000046")]
private interface IDispatch {
int GetTypeInfoCount();
[return: MarshalAs(UnmanagedType.Interface)]
ITypeInfo GetTypeInfo([In, MarshalAs(UnmanagedType.U4)] int iTInfo, [In, MarshalAs(UnmanagedType.U4)] int …Run Code Online (Sandbox Code Playgroud) 在我的一个集成测试中,我有两个线程卸载然后安装程序,但是当按顺序运行时会产生错误 Failed to grab execution mutex. System error 258.
为了解决这个问题,我必须在卸载后睡觉.我试着检查msiexec进程是否正在运行但是一直有2-3个因此它不是一个好的指标.有没有办法检查msiexec执行互斥锁是否可用?
我在ruby中做一个http请求:
http = Net::HTTP.new(uri.host, uri.port)
req = Net::HTTP::Post.new(uri.path)
req.body = payload
req['customeheader'] = 'xxxxxxxxx'
http.set_debug_output $stdout
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我打开了调试,当请求发布时,我可以看到标题被发布为:
Customheader: xxxxxxxxx
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反正有没有阻止这个,我发布的第三方服务器发出错误,因为标题名称不正确 - 它正在期待 customheader:
我们的应用引擎数据存储区中有一些非结构化的文本数据.我想在数据存储区对象的子集上创建一个属性的"一次性"标记云.环顾四周之后,我看不到任何框架可以让我在没有自己写的情况下做到这一点.
我的想法是:
因为我之前从未这样做过,所以如果首先有一些框架可以帮助我(请),如果不是我以正确的方式接近它,我就会徘徊.即请随意指出计划中的漏洞.
当antlr v3.1编译此规则时,我收到警告
sentence
:
(CAPITAL_LETTERS_AND_NUMBERS | INT | ANY_WORD )
(
INT
| CAPITAL_LETTERS_AND_NUMBERS
| ANY_WORD
)*;
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警告是:
5:2: Decision can match input such as "CAPITAL_LETTERS_AND_NUMBERS" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
Semantic predicates were present but were hidden by actions.
Decision can match input such as "INT" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
Semantic predicates were present but were hidden by …Run Code Online (Sandbox Code Playgroud) 我想从COM对象调用GetIdsOfNames函数,该对象在c#中实现IDispatch接口.我编写了以下代码,但它失败了DISP_E_UNKNOWNNAME.这是正确的做法吗?
Object so = Activator.CreateInstance(Type.GetTypeFromProgID("ProgID"));
Object[] args = new Object[5];
string[] rgsNames = new string[1];
rgsNames[0] = "PrintNormal";
uint LOCALE_SYSTEM_DEFAULT = 0x0800;
uint lcid = LOCALE_SYSTEM_DEFAULT;
int cNames = 1;
int[] rgDispId = new int[1];
args[0] = IntPtr.Zero;
args[1] = rgsNames;
args[2] = cNames;
args[3] = lcid;
args[4] = rgDispId;
Object result = so.GetType().InvokeMember("GetIDsOfNames", BindingFlags.InvokeMethod, null, so, args);
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谢谢,
理查德
我在代码中遇到一个错误,该错误隐藏了重写方法,因为我忘记了@classmethod装饰器。我在徘徊是否可以强制采用另一种方式(注意这可能是不良的设计),但类似于:
class Super:
@classmethod
def do_something(cls):
...
class Child:
def do_something(self):
...
obj = Child()
obj.do_something() #calls the child
Child.do_something() #calls the Super method
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编辑:目前尚无具体案例,但我正在徘徊,如果可以假设可以做到。