为什么我的 PictureBox 加载例程会泄漏内存?
我一直尝试在 C++/CLI 应用程序中交换 PictureBox 中的图像,但我的解决方案似乎存在内存泄漏:
System::Void button1_Click(System::Object^ sender, System::EventArgs^ e)
{
// Pick a new bitmap
static int resource = IDB_BITMAP1;
if( resource == IDB_BITMAP2)
{
resource = IDB_BITMAP1;
}
else
{
resource = IDB_BITMAP2;
}
// Get the primary module
Module^ mod = Assembly::GetExecutingAssembly()->GetModules()[0];
// Get the instance handle
IntPtr hinst = Marshal::GetHINSTANCE(mod);
// Get the bitmap as unmanaged
HANDLE hbi = LoadImage((HINSTANCE) hinst.ToPointer(),MAKEINTRESOURCE(resource),IMAGE_BITMAP,0,0,LR_DEFAULTCOLOR);
// Import the unmanaged bitmap into the managed side
Bitmap^ bi = Bitmap::FromHbitmap(IntPtr(hbi));
// Remove any previously stored images
if(m_pictureBox1->Image != nullptr)
{
delete m_pictureBox1->Image;
m_pictureBox1->Image = nullptr;
}
// Insert the bitmap into the picture box
m_pictureBox1->Image = bi;
// Free up the unmanaged bitmap
DeleteObject(hbi);
}
据我所知,我明确释放了内存,那么为什么任务管理器会这样做每次单击按钮时都会报告内存增加约 24k?
I've been trying to swap images in a PictureBox in a C++/CLI application but my solution appears to have a memory leak:
System::Void button1_Click(System::Object^ sender, System::EventArgs^ e)
{
// Pick a new bitmap
static int resource = IDB_BITMAP1;
if( resource == IDB_BITMAP2)
{
resource = IDB_BITMAP1;
}
else
{
resource = IDB_BITMAP2;
}
// Get the primary module
Module^ mod = Assembly::GetExecutingAssembly()->GetModules()[0];
// Get the instance handle
IntPtr hinst = Marshal::GetHINSTANCE(mod);
// Get the bitmap as unmanaged
HANDLE hbi = LoadImage((HINSTANCE) hinst.ToPointer(),MAKEINTRESOURCE(resource),IMAGE_BITMAP,0,0,LR_DEFAULTCOLOR);
// Import the unmanaged bitmap into the managed side
Bitmap^ bi = Bitmap::FromHbitmap(IntPtr(hbi));
// Remove any previously stored images
if(m_pictureBox1->Image != nullptr)
{
delete m_pictureBox1->Image;
m_pictureBox1->Image = nullptr;
}
// Insert the bitmap into the picture box
m_pictureBox1->Image = bi;
// Free up the unmanaged bitmap
DeleteObject(hbi);
}
As far as I can see, I'm explicitely releasing the memory so why does task manager report an ~24k increase in memory each time the button is clicked?
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评论(2)
两个词:垃圾收集
two words: garbage collection
奇怪的是,这实际上看起来是当您将鼠标悬停在按钮上时引起的。每次执行此操作时,内存都会跳跃,但经过足够多的鼠标悬停后,内存使用量就会稳定下来。实际单击按钮(即调用我的例程)不会导致任何泄漏。
Bizarrely, this actually looks to be caused when you mouse-over the button. Each time you do that the memory jumps but after enough mouse-overs that memory usage stabilises. The actual clicks on the button (i.e. calls to my routine) don't cause any leakage.