Bitmap. GetHicon () method of how to release the memory-CodePudding

I wrote a winform screen magnifier tool in c #, centering on the mouse position, take a picture, will figure Cursor images, real-time amplification, this method through the timer tick event constantly call, I found the Cursor=new Cursor (bitmap. The GetHicon ()); This line of code that will increase the physical memory footprint, lead to system gradually slow down, please everyone a great god is there any solution,

CodePudding user response:

You keep the Cursor=new Cursor (bitmap GetHicon ());
So where is the release before the new Cursor (bitmap. GetHicon ()) of?

CodePudding user response:

New object is created, of course, the memory will increase

CodePudding user response:

reference 1st floor xuzuning response:

you constantly Cursor=new Cursor (bitmap. GetHicon ());
So where is the release before the new Cursor (bitmap. GetHicon ()) of?

That should be how to release?

CodePudding user response:

I don't know how to do a magnifying glass and cursor associated

CodePudding user response:

Attach relevant code

 
Private void RefreshImg () 
{
Var mousePos=mousePos;//mouse position 
Var updatedBox=GetUpdatedBox (mousePos);//according to the mouse position draw a rectangle 
Var img=GetDesktopImg (updatedBox);//to get related screen screenshots 

SetCursor (img);//convert the screenshot to the cursor 

MousePos=new Point (); 
UpdatedBox=new Rectangle (); 
Img=null; 
} 

Private Rectangle GetUpdatedBox (Point p) 
{
Return a Rectangle. Truncate (new RectangleF (p.X - magnifierWidth/zoomValue/2, p.Y - magnifierHeight zoomValue/2, magnifierWidth/zoomValue, magnifierHeight/zoomValue)); 
} 

Private Bitmap GetDesktopImg (a Rectangle the rect) 
{
IntPtr hWnd=GetDesktopWindow (); 
System, Drawing Graphics grpScreen=System. Drawing, Graphics. FromHwnd (hWnd); 

System. Drawing. The Bitmap Bitmap=new System. Drawing. The Bitmap (the rect. Width, the rect. Height, System. Drawing. The Imaging. PixelFormat. Format32bppArgb); 
System, Drawing Graphics grpBitmap=System. Drawing, Graphics. FromImage (bitmap); 
IntPtr hdcScreen=grpScreen. GetHdc (); 
IntPtr hdcBitmap=grpBitmap. GetHdc (); 
BitBlt (hdcBitmap, 0, 0, bitmap. The Width, the bitmap. The Height, hdcScreen, the rect. Left, the rect. Top, 0 x00cc0020); 
GrpBitmap. ReleaseHdc (hdcBitmap); 
GrpScreen. ReleaseHdc (hdcScreen); 
GrpBitmap. The Dispose (); 
GrpScreen. The Dispose (); 
return bitmap; 
} 

Private void SetCursor (Bitmap img) 
{
Using (var g=Graphics. FromImage (magnifierImg)) 
{
G.D rawImage (img, 0, 0, magnifierImg Width, magnifierImg, Height); 
G.D rawRectangle (new Pen (new SolidBrush (Color. Black)), the new Rectangle (0, 0, magnifierImg. Width - 1, magnifierImg. Height - 1)); 
G.D ispose (); 
} 

Cursor=new Cursor (magnifierImg GetHicon ());//how to release? 
}

CodePudding user response:

reference 4 floor crystal_lz response:

I don't know how to do a magnifying glass and cursor between the

To enlarge the image to make the mouse cursor

CodePudding user response:

Only a magnifying glass which have so trouble and do not see your code where there is the enlarge images

 
Public partial class Form6: Form 
{
Public Form6 () {
InitializeComponent(); 
This. The timer1. Interval=50; 
Enclosing FormBorderStyle=FormBorderStyle. None; 
} 

Private Point m_ptLast; 
Private Size m_szSrc; 
Private float m_fScale; 
Private Bitmap m_bmpSrc; 

Private void Form6_Load (object sender, EventArgs e) {
M_fScale=4; 
M_szSrc=https://bbs.csdn.net/topics/new System. Drawing. The Size (15, 15); 
M_bmpSrc=https://bbs.csdn.net/topics/new Bitmap (m_szSrc. Width, m_szSrc. Height); 
Timer1. Enabled=true; 
} 

Private void timer1_Tick (object sender, EventArgs e) {
This. TopMost=true;//is something wrong with my system? TopMost attributes was invalid can only set the Timer inside kept calling to effective helpless 
If (m_ptLast==MousePosition) return; 
M_ptLast=MousePosition; 
Using (Graphics g=Graphics. FromImage (m_bmpSrc)) {
Right opyFromScreen (MousePosition. X-ray m_bmpSrc. Width/2, MousePosition. Y - m_bmpSrc. Height/2, 0, 0, m_bmpSrc. Size); 
G.D rawRectangle (Pens. The Magenta, 0, 0, m_bmpSrc. Width 1, m_bmpSrc. Height - 1); 
Enclosing the BackgroundImage=ZoomImage (m_bmpSrc m_fScale); 
This. Size=this. BackgroundImage. Size; 
This. Left=MousePosition. X + 20;//according to the mouse Settings window position 
This. Top=MousePosition. Y + 20;//there is no judge whether form beyond the edge of the screen 
} 
} 

Public static Image ZoomImage (Image, Image, float scale) {
If (image==null) 
Throw new ArgumentNullException (" image always be null "); 
If (scale & lt;=0) 
Throw new ArgumentException (" scale must be wining zero "); 
Bitmap BMP=new Bitmap ((int) Math. Between (image. Width * scale), (int) Math. Between (image. * scale Height)); 
As Bitmap Bitmap bmpOld=image. Clone (); 
BitmapData bmpDataNew=BMP. LockBits (new Rectangle (Point. The Empty, BMP. Size), ImageLockMode. WriteOnly, PixelFormat. Format32bppArgb); 
BitmapData bmpDataOld=bmpOld. LockBits (new Rectangle (Point. The Empty, image Size), ImageLockMode. ReadOnly, PixelFormat. Format32bppArgb); 
Byte [] byColorNew=new byte [bmpDataNew Height * bmpDataNew in Stride]; 
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