--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/R/scratch/callbacks.R	Thu Mar 19 22:26:28 2015 +0100
@@ -0,0 +1,83 @@
+
+
+dynbind("user32","RegisterClassEx(p)p;")
+
+
+C.struct <- function(signature) {
+	map <- strsplit(signature,'[; \t\n]+')[[1]]
+	if (map[1] == "")
+	  map <- map[-1]
+	n <- length(map)
+	types   <- map[seq(1,n,by=2)]
+	ids     <- map[seq(2,n,by=2)]
+	sizes   <- C.sizes[types]
+	offsets <- c(0,cumsum(sizes))
+	ids     <- c(ids,".sizeof")
+	types   <- c(types,"")
+	sizes   <- c(sizes,"")
+	data.frame(
+		id=ids,
+		type=types,
+		size=sizes,
+		offset=offsets,
+		row.names=1
+	)
+}
+
+WNDCLASSEX <- "
+UINT cbSize;
+UINT style;
+WNDPROC lpfnWndProc;
+int cbClsExtra;
+int cbWndExtra;
+HINSTANCE hInstance;
+HICON hIcon;
+HCURSOR hCursor;
+HBRUSH hbrBackground;
+LPCTSTR lpszMenuName;
+LPCTSTR lpszClassName;
+HICON hIconSm;
+"
+
+WNDCLASSEX <- C.struct("
+UINT cbSize;
+UINT style;
+WNDPROC lpfnWndProc;
+int cbClsExtra;
+int cbWndExtra;
+HINSTANCE hInstance;
+HICON hIcon;
+HCURSOR hCursor;
+HBRUSH hbrBackground;
+LPCTSTR lpszMenuName;
+LPCTSTR lpszClassName;
+HICON hIconSm;
+") 
+
+library(rdyncall)
+
+allocC <- function(info)
+{
+  x <- malloc(sizeof(info))
+  attr(x, "cstruct") <- info
+  class(x) <- "cstruct"
+  return(x)
+}
+
+packC <- function( address, offset, type, value )
+{
+  
+}
+
+
+"$.Cstruct<-" <- function (cstruct, name, value)
+{
+  info <- attr(x, "cstruct")
+  element <- info[name,]
+  packC( cstruct, element$offset, sigchar(element$type), value )
+  return(value)
+}
+
+winclass <- allocC(WNDCLASS) 
+winclass$cbSize <- sizeofC(WNDCLASS) 
+RegisterClassEx(winclass)