C#

/*(parameters)*/ string[] oldValues,
int oldCount = oldValues.Length;
GCHandle[] oldHandles = new GCHandle[oldCount];
for (int i = 0; i < oldCount; i++)
{
    oldHandles[i] = GCHandle.Alloc(oldValues[i], GCHandleType.Pinned);
}
// in an inner (inner) loop:
char* oldFix = oldHandles[i].AddrOfPinnedObject();
// instead of
fixed (char* oldFix = oldValues[i])

Jacek Gajek wrote:

but I couldn't use a fixed statement when outside a loop

harold aptroot wrote:

Why is this? I've written plenty of loops spanned by a fixed.

while(...) // m times
for(int i = 0; i<len; i++)
{
   // cannot move outside of loop, neither this nor the outer one
   // so we end up with n*m fixed statements
   fixed(char* str = A[i])
}

// pin the array's elements
GCHandle[] handles= new GCHandle[len];
for (int i = 0; i < len; i++)
{
    handles[i] = GCHandle.Alloc(A[i], GCHandleType.Pinned);
}
while(...) // m times
for(int i = 0; i<len; i++)
{
   // get pinned:
   char* str = (char*)handles[i].AddrOfPinnedObject()
}
//free handles
for (int i = 0; i < len; i++)
{
    handles[i].Free();
}

Jacek Gajek wrote:

1.5x performance increase

Jacek Gajek wrote:

If it is wrong

Jacek Gajek wrote:

what is an alternative

PIEBALDconsult wrote:

Set it within the fixed block?

Jacek Gajek wrote:

I though it was obvious

private Dictionary<Control, Font> cFontDict = new Dictionary<Control, Font>();

this.textBox1.Font = new System.Drawing.Font("Arial", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

Font newFont = new Font(oldFont.FontFamily, newSize);