C++使用 Visual Studio Express 2010 表单应用程序进行多线程处理
我正在开发一个 Windows 窗体应用程序，它连接到一个硬件，获取大量数据（~1 GSample/秒），对其进行处理，然后单击按钮将其输出到屏幕上。我现在尝试在一个可以随时启动/停止的循环中自动化该过程，以便我可以在调整采集硬件的输入的同时对其进行监控。我认为很明显我需要在一个单独的线程上执行此操作，但我在 c++/cli 中尝试执行此操作很费时间 - 我发现了许多使用 MFC 的好示例，但 MFC 不支持表达。
具体来说：我的任务是按下 Form1.h 中处理的按钮，调用主文件 Acquisition.cpp 中的函数，其中包含以下代码（当前是无限循环）
void Form1::realTimeUpdate()
{
// live is a boolean variable set by a button on the form
while(live)
{
displayVariance(getVar(getQuadratures(100),nbrSamples));
}
}
我希望在单独的线程中执行此代码，以便主程序可以监听用户停止操作的请求。如果没有线程，我目前必须强制退出程序（或将其设置为运行固定次数）才能停止它。
有什么建议我可以如何在单独的线程上运行此代码吗？
我已经（未成功）尝试了一些操作：
修改此 Microsoft 示例。问题：需要 /clr:oldSyntax 选项，该选项与程序中的其他 1300 行代码不兼容。
尝试做我在 Java 中所做的事情（声明一个全局线程并从代码中的任何点启动/停止它。问题：编译器不允许我声明一个全局 System::Threading.Thread
这个 问题：需要 MFC。
任何建议都会非常好赞赏！
I am developing a Windows forms application which connects to a piece of hardware, acquires a lot of data (~1 GSample/sec), processes it, and spits it out to the screen upon a button click. I am now trying to automate the process in a loop that can be started/stopped at any time so I can monitor it whilst tweaking the input to the acquisition hardware. I thinks it's clear that I need to do this on a separate thread, but I'm having a heck of a time trying to do this in c++/cli - I have found a number of good examples using MFC, which is not supported by Express.
Specifically: My task is to press a button which is handled in Form1.h, to call a function in my main file Acquisition.cpp which contains the following code (currently an infinite loop)
void Form1::realTimeUpdate()
{
// live is a boolean variable set by a button on the form
while(live)
{
displayVariance(getVar(getQuadratures(100),nbrSamples));
}
}
I wish to execute this code in a separate thread so that the main program can listen for the user request to stop the operation. Without threading, I currently have to forcefully quit the program (or set it to run a fixed number of times) to stop it.
Is there any suggestions how I might go about running this code on a separate thread?
I've (unsuccessfully) tried a few things already:
Modifying the example given in This Microsoft Example. Problem: requires /clr:oldSyntax option which is incompatible with the other 1300 lines of code in the program.
Trying to do what I'd do in Java (Declare a global thread and start/stop it from any point in the code. Problem: Compiler won't let me declare a global System::Threading.Thread
this beautiful example. Problem: Requires MFC.
Any suggestions would be greatly appreciated!
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您可以使用BackgroundWorker 或Thread 来处理这个问题。但是，您需要确保更新 UI 的工作部分被封送回 UI 线程。
这是有关 C++/CLI 线程的教程。
You can use a BackgroundWorker or a Thread to handle this. You'll need to make sure that the portion of your work that updates the UI is marshaled back to the UI thread, however.
Here is a tutorial on threading in C++/CLI.
作为记录，根据 Reed 关于使用 BackgroundWorker 的建议，我筛选了 此页面并修改了我的代码，以便：
它创建了一个新的backgroundWorker BGWorker，其中BGWorker->DoWork()调用了我的realTimeUpdate()函数。
主窗体上的按钮调用 RunWorkerAsync() 或 CancelAsync()，具体取决于进程是否正在运行（通过主程序中的布尔标志检查）。
realTimeUpdate() 函数现在传递一个BackgroundWorker -
realTimeUpdate(BackgroundWorker^worker, DoWorkEventArgs^e)在内部循环中完成每个计算后，它调用worker->ReportProgress(result) ） 功能。在 BGWorker->ProgressChanged() 函数中，有一个单独的函数 upDataUI(int) 在主窗体上绘制结果。再次感谢您的帮助。
For the record, upon Reed's suggestion about using a BackgroundWorker, I sifted through the code at the bottom of this page and modified my code so that:
It created a new backgroundWorker BGWorker in which BGWorker->DoWork() called my realTimeUpdate() function.
A button on the main Form calls either RunWorkerAsync() or CancelAsync() depending on whether or not the process is running (checked by a boolean flag in my main program).
The realTimeUpdate() function is now passed a BackgroundWorker -
realTimeUpdate(BackgroundWorker^ worker, DoWorkEventArgs ^ e)After each calculation is complete within the internal loop, it calls worker->ReportProgress(result) function. In the BGWorker->ProgressChanged() function a separate function, upDataUI(int) draws the result on the main form.Thanks again for the help.