我如何释放Hbitmap [英] How can i free hbitmap

问题描述

您好，我具有以下功能，此后我将在c#中使用该功能来显示带有"Bitmap.FromHbitmap(IntPtr)"的位图，但经过几次使用后，此操作将导致内存泄漏.

Hello i have the following function which i use afterwards from c# to display a bitmap with "Bitmap.FromHbitmap(IntPtr)" but after a few usages this ends with a memory leak .

IntPtr GetFrame(int Width,int Height,int nFrame)
    {
        width= Width;
        height = Height;
        HBITMAP hb;
        m_piHelper->GetBmp(width,height,nFrame,&hb);    
        return IntPtr(hb);
    }

可能我应该删除某个对象，但我不知道在返回之前我可以在哪里做，但最终却没有图像，但出现gdi错误

Probably i should deleteobject somewere but i dont know where i could do that i tried before return but i end up with no image but a gdi error

谢谢

推荐答案

我假设您正在使用C#.

I assume you are using C#.

您可以使用DeleteObject删除此HBITMAP.

You can use DeleteObject to delete this HBITMAP.

这样声明:

using System.Runtime.InteropServices class API { [DllImport("WINGDI32.dll")] public static extern int DeleteObject(IntPtr hObject); }

并删除对象:

API.DeleteObject(hBitmap);

由于您的函数返回了指向HBITMAP的指针，因此您不能在返回之前将其删除.相反，当不再使用此位图时，应将其删除得足够晚.

As your function returns a pointer to the HBITMAP, you cannot delete it before return. Instead, you should delete it later enough when there will be no more use of this bitmap.

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