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我已经实现了一些可以是 viewed here 的屏幕捕获代码
我正在使用 this article 中的 GetTimeInNanoseconds
该函数每 100 毫秒调用一次。我已经计算了执行部分功能所需的毫秒数，即:
screenShotStart = GetTimeInNanoseconds();
CGImageRef image = CGWindowListCreateImage(rect, kCGWindowListOptionIncludingWindow|kCGWindowListOptionOnScreenBelowWindow, 0, kCGWindowImageDefault);
CGImageRelease(image);
screenShotStop = GetTimeInNanoseconds();
screenShotElapsed = screenShotStop - screenShotStart;
/* Current Delta Time */
screenShotElapsedF = ((float) screenShotElapsed)/1000000.0f;
/* Smooth Delta Time */
screenShotTime = 0.9f*screenShotTime + 0.1f*screenShotElapsedF;
下面的时间测量显示了结果。我很惊讶它有多慢，我想知道为什么。有经验丰富的 Cocoa/Core Graphics OSX 开发人员可以向我解释一下吗？并可能告诉我应该如何修复它？
平滑:以毫秒为单位的平均增量时间。Current:最新的，最新的增量时间，以毫秒为单位。
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最佳答案
CGWindow API 不适用于高帧率捕获。一方面，它没有捕获当前显示的屏幕图像。它被概括为可能捕获内容的各个部分。它可以包含或排除窗口、桌面元素、阴影等。这意味着它会为每次调用合成一个新图像。是的，这意味着它必须锁定所有窗口的后备缓冲区。
Apple 提供了一对关于捕获屏幕内容的技术问答文章。一种用于捕获单张图像，他们建议使用 CGDisplayCreateImage()。 .另一个是随着时间的推移捕捉屏幕事件的电影，他们推荐使用 AV Foundation。 Technical Q&A QA1741: How to take an image snapshot of the screen on Mac OS X Lion Technical Q&A QA1740: How to capture screen activity to a movie file using AV Foundation on Mac OS X Lion
关于objective-c - OSX 上的屏幕捕获代码缓慢。为什么？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19287179/
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关闭。这个问题不符合Stack Overflow guidelines .它目前不接受答案。 我们不允许提问寻求书籍、工具、软件库等的推荐。您可以编辑问题，以便用事实和引用来回答。 关闭 7 年前。
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