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