An implemention of ITextHost wo works only with windbg

[qWord]

It must be perfect now.

run your program, open the task manager and look for the CPU usage - its far away from perfect.

[TouEnMasm]

seem he consume some times of the processor.
Perhaps have you an idea ?.

[TouEnMasm]

The more simple is responsible of this

invoke DrawText,hdc,addr asciihello, LENGTHOF asciihello -1,addr rect,DT_CENTER

I will search a little,perhaps msdn will answer.

[qWord]

The InvalidRect() must not be called from WM_PAINT. The invalidation forces the system to resend WM_PAINT endless. Call the function when the state of the graphic object has change (e.g. after creation).

[TouEnMasm]

ALL is good now
I have just replace the DrawText function by the DrawTextEx and added a NULL parameter that all.
Now that all is good ,I have deleted the InvalidateRect function.
I change the textdraw_final.zip in the post,so you can see the difference.
I have not searched why DrawText don't want to work,all parameter are good.