public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
BeginRender_callback = new ManagedSs.BeginRender_callback(BeginRender);
EndRender_callback = new ManagedSs.EndRender_callback(EndRender);
Resize_callback = new ManagedSs.Resize_callback(Resize_);
ss = new ManagedSs();
ss.RegisterBeginRender(BeginRender_callback);
ss.RegisterEndRender(EndRender_callback);
ss.RegisterResize(Resize_callback);
ss.Connect("localhost");
}
public unsafe sbyte* BeginRender()
{
//pin image buf
return nullptr; // fixed_image_write_pointer;
}
public unsafe void EndRender()
{
//refresh image
//unpin
}
public void Resize_(int width, int height)
{
//resize image
}
private ManagedSs.BeginRender_callback BeginRender_callback;
private ManagedSs.EndRender_callback EndRender_callback;
private ManagedSs.Resize_callback Resize_callback;
private ManagedSs;
}
c# unsafe code: pinning asynchronously
Author
asynchronous might be the wrong word. I'm putting a C# GUI around a C++/CLI class. The GUI registers a C# callback with C++, this callback returns a writable pointer to a bitmap.
Is this even possible to do with the unsafe/fixed keywords? I need to hold my C# image pointer fixed starting in the BeginRender callback, and ending in the EndRender callback. The image pointer cannot move between those calls.
[Edited by - thedustbustr on July 2, 2008 9:53:14 AM]
Author
New problem. I can write to the bitmap, but the containing picturebox does not update. If I call picturebox.invalidate(), nothing happens, probably because this method is being executed as a callback from a separate thread. if I use picturebox.update(), it crashes telling me that I can't call that from a separate thread. if I use picturebox.invoke to call invalidate through a delegate, still nothing happens.
For googlers, here is the solution to the original problem:
For googlers, here is the solution to the original problem:
public unsafe sbyte* BeginRender() { Rectangle locked_area = new Rectangle(0,0,target_image.Width, target_image.Height); target_data = target_image.LockBits( locked_area, System.Drawing.Imaging.ImageLockMode.WriteOnly, target_image.PixelFormat); IntPtr pixels = target_data.Scan0; return (sbyte*)pixels; } public unsafe void EndRender() { target_image.UnlockBits(target_data); pictureBox1.Invalidate(); }This topic is closed to new replies.
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