Added function generation to zwinconstgen.go. cgo uses DWARF to get function parameters, so we'll just specify them manually ourselves; see funcnames_windows.go.

redo/funcnames_windows.go

@@ -0,0 +1,6 @@
+// 11 july 2014
+
+package ui
+
+// wfunc kernel32 GetModuleHandleW *uint16 uintptr
+// wfunc kernel32 GetStartupInfoW *s_STARTUPINFOW void

redo/init_windows.go

@@ -15,8 +15,8 @@ var (
 )
 
 func getWinMainParams() (err error) {
-	hInstance, err = f_GetModuleHandle(nil)
-	if err != nil {
+	hInstance, err = f_GetModuleHandleW(nil)
+	if hInstance == 0 {
 		return fmt.Errorf("error getting hInstance: %v", err)
 	}
 

redo/zwinconstgen.go

@@ -22,7 +22,7 @@ func getPackage(path string) (pkg *ast.Package) {
 	filter := func(i os.FileInfo) bool {
 		return strings.HasSuffix(i.Name(), "_windows.go")
 	}
-	pkgs, err := parser.ParseDir(fileset, path, filter, parser.AllErrors)
+	pkgs, err := parser.ParseDir(fileset, path, filter, parser.AllErrors | parser.ParseComments)
 	if err != nil {
 		panic(err)
 	}
@@ -57,8 +57,6 @@ func (w *walker) Visit(node ast.Node) ast.Visitor {
 				unknown[n.Name] = struct{}{}
 			}
 		}
-	case *ast.Comment:		// function?
-		// TODO
 	}
 	return w
 }
@@ -72,9 +70,101 @@ func gatherNames(pkg *ast.Package) {
 		for _, d := range f.Decls {
 			ast.Walk(&walker{desired}, d)
 		}
+		for _, c := range f.Comments {
+			for _, cc := range c.List {
+				readComment(cc)
+			}
+		}
 	}
 }
 
+var funcs []string
+var dlls = map[string]struct{}{}
+
+// parse comments of the form "// wfunc dll Name argtypes {ret[,noerr]|void}"
+// TODO clean this up
+func readComment(c *ast.Comment) {
+	words := strings.Split(c.Text, " ")[1:]		// strip leading //
+	if len(words) <= 0 || words[0] != "wfunc" {
+		return
+	}
+	dll := words[1]
+	dlls[dll] = struct{}{}
+	name := words[2]
+	args := make([]string, 0, len(words))
+	for i := 3; i < len(words) - 1; i++ {
+		args = append(args, words[i])
+	}
+	ret := words[len(words) - 1]
+
+	funcs = append(funcs, fmt.Sprintf("var fv_%s = %s.NewProc(%q)", name, dll, name))
+
+	r1 := "r1"
+	err := "err"
+	assign := ":="
+
+	r := rune('a')
+	argspec := ""
+	for _, t := range args {
+		argspec += fmt.Sprintf("%c %s, ", r, t)
+		r++
+	}
+	retspec := ""
+	if ret != "void" {
+		r := strings.Split(ret, ",")
+		retspec = "(" + r[0]
+		if len(r) > 1 && r[1] == "noerr" {
+			err = "_"
+		} else {
+			retspec += ", error"
+		}
+		retspec += ")"
+	} else {
+		r1 = "_"
+		err = "_"
+		assign = "="
+	}
+	funcs = append(funcs, fmt.Sprintf("func f_%s(%s) %s {", name, argspec, retspec))
+
+	call := fmt.Sprintf("\t%s, _, %s %s fv_%s.Call(", r1, err, assign, name)
+	r = rune('a')
+	for _, t := range args {
+		call += "uintptr("
+		if t[0] == '*' {
+			call += "unsafe.Pointer("
+		}
+		call += fmt.Sprintf("%c", r)
+		if t[0] == '*' {
+			call += ")"
+		}
+		call += "), "
+		r++
+	}
+	call += ")"
+	funcs = append(funcs, call)
+
+	if ret != "void" {
+		r := strings.Split(ret, ",")
+		retspec = "return (" + r[0] + ")("
+		if r[0][0] == '*' {
+			retspec += "unsafe.Pointer("
+		}
+		retspec += "r1"
+		if r[0][0] == '*' {
+			retspec += ")"
+		}
+		retspec += ")"
+		if len(r) > 1 && r[1] == "noerr" {
+			// do nothing
+		} else {
+			retspec += ", err"
+		}
+		funcs = append(funcs, retspec)
+	}
+
+	funcs = append(funcs, "}")
+}
+
 // for backwards compatibiilty reasons, Windows defines GetWindowLongPtr()/SetWindowLongPtr() as a macro which expands to GetWindowLong()/SetWindowLong() on 32-bit systems
 // we'll just simulate that here
 var gwlpNames = map[string]string{
@@ -82,10 +172,6 @@ var gwlpNames = map[string]string{
 	"amd64":		"etWindowLongPtrW",
 }
 
-func writeLine(f *os.File, line string) {
-	fmt.Fprintf(f, "%s\n", line)
-}
-
 const outTemplate = `package main
 import (
 	"fmt"
@@ -108,7 +194,7 @@ import (
 // #include <commctrl.h>
 // #include <stdint.h>
 {{range .Consts}}// uintptr_t {{.}} = (uintptr_t) ({{noprefix .}});
-{{end}}import "C"
+{{end}}import "C"		// notice the lack of newline in the template
 // MinGW will generate handle pointers as pointers to some structure type under some conditions I don't fully understand; here's full overrides
 var handleOverrides = []string{
 	"HWND",
@@ -148,8 +234,16 @@ func winName(t reflect.Type) string {
 func main() {
 	buf := new(bytes.Buffer)
 	fmt.Fprintln(buf, "package ui")
+	fmt.Fprintln(buf, "import (")
+	fmt.Fprintln(buf, "\t\"syscall\"")
+	fmt.Fprintln(buf, "\t\"unsafe\"")
+	fmt.Fprintln(buf, ")")
+
+	// constants
 {{range .Consts}}	fmt.Fprintf(buf, "const %s = %d\n", {{printf "%q" .}}, C.{{.}})
 {{end}}
+
+	// structures
 	var t reflect.Type
 {{range .Structs}}	t = reflect.TypeOf(C.{{noprefix .}}{})
 	fmt.Fprintf(buf, "type %s struct {\n", {{printf "%q" .}})
@@ -166,6 +260,14 @@ func main() {
 	fmt.Fprintf(buf, "type t_LPARAM %s\n", winName(reflect.TypeOf(C.LPARAM(0))))
 	fmt.Fprintf(buf, "type t_LRESULT %s\n", winName(reflect.TypeOf(C.LRESULT(0))))
 
+	// functions
+{{range .Funcs}}	fmt.Fprintf(buf, "%s\n", {{printf "%q" .}})
+{{end}}
+
+	// DLLs
+{{range .DLLs}}		fmt.Fprintf(buf, "var %s = syscall.NewLazyDLL(%q)\n", {{printf "%q" .}}, {{printf "%s.dll" . | printf "%q"}})
+{{end}}
+
 	// and finally done
 	res, err := format.Source(buf.Bytes())
 	if err != nil { panic(err.Error() + "\n" + string(buf.Bytes())) }
@@ -176,6 +278,8 @@ func main() {
 type templateArgs struct {
 	Consts	[]string
 	Structs	[]string
+	Funcs	[]string
+	DLLs		[]string
 }
 
 var templateFuncs = template.FuncMap{
@@ -213,6 +317,7 @@ func main() {
 	// keep sorted for git
 	consts := make([]string, 0, len(unknown))
 	structs := make([]string, 0, len(unknown))
+	sorteddlls := make([]string, 0, len(dlls))
 	for ident, _ := range unknown {
 		if strings.HasPrefix(ident, "s_") {
 			structs = append(structs, ident)
@@ -220,8 +325,12 @@ func main() {
 		}
 		consts = append(consts, ident)
 	}
+	for dll, _ := range dlls {
+		sorteddlls = append(sorteddlls, dll)
+	}
 	sort.Strings(consts)
 	sort.Strings(structs)
+	sort.Strings(sorteddlls)
 
 	// thanks to james4k in irc.freenode.net/#go-nuts
 	tmpdir, err := ioutil.TempDir("", "windowsconstgen")
@@ -238,6 +347,8 @@ func main() {
 	err = t.Execute(f, &templateArgs{
 		Consts:		consts,
 		Structs:		structs,
+		Funcs:		funcs,
+		DLLs:		sorteddlls,
 	})
 	if err != nil {
 		panic(err)