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如何从C＃中的Graphics对象获取位图？

[英]How to get the bitmap from a Graphics object in C#?

原文 2013-02-04 21:25:47 9 1 c#/ .net/ image/ graphics/ bitmap

How do you get a bitmap from a graphics object (or at least a pointer to it's Scan0)? 如何从图形对象（或至少指向它的Scan0）获取位图？

If a graphics object really always refers to a bitmap, then it IS possible to get to the bitmap data from the graphics object. 如果图形对象确实总是引用位图，则可以从图形对象获取位图数据。 (Think: the graphics object HAS TO have a pointer to the bmp data. I'd code it in C but I'm on a project that requires everyone be hobbled by .NET.) （想想：图形对象有一个指向bmp数据的指针。我用C编写代码但是我正在一个需要每个人都被.NET踩踏的项目。）

Applications of this would include things like: - using unsafe code to obtain faster screenshots - modifying what's on a control using CreateGraphics - (and the task I'm actually trying to accomplish which would take too long to explain) 应用程序包括： - 使用不安全的代码获取更快的屏幕截图 - 使用CreateGraphics修改控件上的内容 - （我实际上要完成的任务需要很长时间才能解释）

Yes, this has been asked before but never answered. 是的，以前曾经问过，但从未回答过。 I'm not looking for how to get a graphics object from a bitmap (obviously trivial). 我不是在寻找如何从位图中获取图形对象（显然是微不足道的）。 FAIL1 , FAIL2 , FAIL3 , FAIL4 , FAIL5 , FAIL6 , FAIL7 FAIL1 ， FAIL2 ， FAIL3 ， FAIL4 ， FAIL5 ， FAIL6 ， FAIL7

1 个解决方案

I don't think what you're trying to do is possible since your assumption that "a graphics object really always refers to a bitmap" is false. 我不认为你想要做的是可能的，因为你假设“图形对象总是指向位图”是错误的。

There's a good article here that shows how to render a control to bitmap if you really want a bitmap and another one here that shows how to quickly update the screen at the WndProc level. 有一个很好的文章在这里显示了如何渲染控制位图，如果你真的想要一个位图和另外一个在这里展示了如何快速在WndProc的水平更新屏幕。 If you're more familiar with C++ that might get you going the right direction. 如果您对C ++更熟悉，可能会让您朝着正确的方向前进。