Cursor Dispose Problem
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Consider my code below
Cursor m_OldCursor; void OnCursorChanged(object sender, EventArgs e) { if(m_OldCursor != null) { m_OldCursor.Dispose(); } m_OldCursor = new Cursor(this.Cursor.CopyHandle()); } void ProcessMouseMove(EventArgs e) { // m_OldCursor is used here too. // hence cannot be declared everytime in // OnCursorChanged. }I know it is wrong to use a object after it is disposed. but every single time the CopyHandle() method is invoked, it creates a handle. since there is a restriction on the number of handles that windows can manage, i need to dispose this handle after its use. if not then the application will crash. If instead of Cursor, it was a control then i could have used the DestroyHandle property. Could you suggest me any other way to do the same. thanks in advance.Keshav Kamat :) India
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Consider my code below
Cursor m_OldCursor; void OnCursorChanged(object sender, EventArgs e) { if(m_OldCursor != null) { m_OldCursor.Dispose(); } m_OldCursor = new Cursor(this.Cursor.CopyHandle()); } void ProcessMouseMove(EventArgs e) { // m_OldCursor is used here too. // hence cannot be declared everytime in // OnCursorChanged. }I know it is wrong to use a object after it is disposed. but every single time the CopyHandle() method is invoked, it creates a handle. since there is a restriction on the number of handles that windows can manage, i need to dispose this handle after its use. if not then the application will crash. If instead of Cursor, it was a control then i could have used the DestroyHandle property. Could you suggest me any other way to do the same. thanks in advance.Keshav Kamat :) India
Hi, two comments: 1. you should not try to dispose of cursors that you did not create yourself; that's every Cursor you get from the Cursors class (the system created those, it will dispose of them too when appropriate, and maybe never !) 2. who is changing the cursor ? cant you do that with a simple method, something like (inside your form class):
public static void SetCursor(Cursor newCursor) {
Cursor oldCursor=Cursor;
Cursor=newCursor;
oldCursor.Dispose();
}no handles involved ! Hope this helps.
Luc Pattyn
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