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// 8 february 2014
package main
import (
"fmt"
// "syscall"
"unsafe"
)
const (
windowclass = "gouiwndclass"
)
var (
hInstance HANDLE
nCmdShow int
// TODO font
// TODO common window class
)
// TODO is this trick documented in MSDN?
func getWinMainhInstance() (err error) {
r1, _, err := kernel32.NewProc("GetModuleHandleW").Call(uintptr(NULL))
if r1 == 0 { // failure
return err
}
hInstance = HANDLE(r1)
return 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
}
const _STARTF_USESHOWWINDOW = 0x00000001
// does not fail according to MSDN
kernel32.NewProc("GetStartupInfoW").Call(uintptr(unsafe.Pointer(&info)))
if info.dwFlags & _STARTF_USESHOWWINDOW != 0 {
nCmdShow = int(info.wShowWindow)
return nil
}
nCmdShow = _SW_SHOWDEFAULT
return nil
}
func doWindowsInit() (err error) {
err = getWinMainhInstance()
if err != nil {
return fmt.Errorf("error getting WinMain hInstance: %v", err)
}
err = getWinMainnCmdShow()
if err != nil {
return fmt.Errorf("error getting WinMain nCmdShow: %v", err)
}
// TODO others
return nil // all ready to go
}
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