1 files changed, 59 insertions, 0 deletions
diff --git a/winmain.go b/winmain.go
new file mode 100644
index 0000000..b79ad81
--- /dev/null
+++ b/winmain.go
@@ -0,0 +1,59 @@
+// 8 february 2014
+package main
+
+import (
+//	"syscall"
+	"unsafe"
+)
+
+// this provides the hInstance and nCmdShow that are normally passed to WinMain()
+
+const (
+	STARTF_USESHOWWINDOW = 0x00000001
+)
+
+var (
+	getModuleHandle = kernel32.NewProc("GetModuleHandleW")
+	getStartupInfo = kernel32.NewProc("GetStartupInfoW")
+)
+
+// TODO is this trick documented in MSDN?
+func getWinMainhInstance() (hInstance HANDLE, err error) {
+	r1, _, err := getModuleHandle.Call(uintptr(NULL))
+	if r1 == 0 {
+		return NULL, err
+	}
+	return HANDLE(r1), nil
+}
+
+// TODO this is what MinGW-w64's crt (svn revision xxx) does; is it best? is any of this documented anywhere on MSDN?
+// TODO I highly doubt Windows API functions ever not fail, so figure out what to do should an error actually occur
+func getWinMainnCmdShow() (nCmdShow int, err error) {
+	var info struct {
+		cb				uint32
+		lpReserved		*uint16
+		lpDesktop			*uint16
+		lpTitle			*uint16
+		dwX				uint32
+		dwY				uint32
+		dwXSize			uint32
+		dwYSzie			uint32
+		dwXCountChars	uint32
+		dwYCountChars	uint32
+		dwFillAttribute		uint32
+		dwFlags			uint32
+		wShowWindow		uint16
+		cbReserved2		uint16
+		lpReserved2		*byte
+		hStdInput			HANDLE
+		hStdOutput		HANDLE
+		hStdError			HANDLE
+	}
+
+	// does not fail according to MSDN
+	getStartupInfo.Call(uintptr(unsafe.Pointer(&info)))
+	if info.dwFlags & STARTF_USESHOWWINDOW != 0 {
+		return int(info.wShowWindow), nil
+	}
+	return SW_SHOWDEFAULT, nil
+}