问题描述
如何使用backgroundworker线程调用API GetWindowRect？
任何人都可以给我一个演示，坦克〜！
how to use backgroundworker thread call the API GetWindowRect?
can anybody give me a demo,tanks~!
[DllImport("user32.dll")]
private static extern int GetWindowRect(int hwnd, ref Rect lpRect);
private void bgw_DoWork(object sender, DoWorkEventArgs e)
{
while (bgw.WorkerSupportsCancellation)
{
GetWindowRect(hWnd,ref lpRect);
}
}
问题的重要性不在于定义hWnd和lpRect，
i只是给出一个演示。
API GetWindowRect必须基于GUI线程，但backgroundworker是另一个不基于GUI线程的线程。
如何解决这个问题，任何人都可以正确编译。
即使我使用System.Windows.Forms.Control.Invoke方法，
但该方法只有两个重载，一个没有参数，
另一个参数是对象数组。
如何在对象数组中使用ref params？
the question importance is not at define hWnd and lpRect,
i just give a demo.
the API GetWindowRect must based on GUI thread,but backgroundworker is another thread not based on GUI thread.
how can solve this quetion, can anybody compilation right.
even though i use System.Windows.Forms.Control.Invoke method，
but the method only have two overload,one is not have params,
another's params is object array.
how can i use ref params in object array?
推荐答案
[DllImport("user32.dll")]
private static extern int GetWindowRect(int hwnd, ref System.Drawing.Rectangle lpRect);
系统.Drawing.Rectangle lpRect = new Rectangle（）;
GetWindowRect（hWnd，ref lpRect）;
System.Drawing.Rectangle lpRect = new Rectangle();
GetWindowRect(hWnd,ref lpRect);
这篇关于如何使用backgroundworker线程调用API GetWindowRect？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！