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// Copyright 2010-2012 The W32 Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package w32
import (
"errors"
"fmt"
"syscall"
"unsafe"
)
var (
modshell32 = syscall.NewLazyDLL("shell32.dll")
procSHBrowseForFolder = modshell32.NewProc("SHBrowseForFolderW")
procSHGetPathFromIDList = modshell32.NewProc("SHGetPathFromIDListW")
procDragAcceptFiles = modshell32.NewProc("DragAcceptFiles")
procDragQueryFile = modshell32.NewProc("DragQueryFileW")
procDragQueryPoint = modshell32.NewProc("DragQueryPoint")
procDragFinish = modshell32.NewProc("DragFinish")
procShellExecute = modshell32.NewProc("ShellExecuteW")
procExtractIcon = modshell32.NewProc("ExtractIconW")
)
func SHBrowseForFolder(bi *BROWSEINFO) uintptr {
ret, _, _ := procSHBrowseForFolder.Call(uintptr(unsafe.Pointer(bi)))
return ret
}
func SHGetPathFromIDList(idl uintptr) string {
buf := make([]uint16, 1024)
procSHGetPathFromIDList.Call(
idl,
uintptr(unsafe.Pointer(&buf[0])))
return syscall.UTF16ToString(buf)
}
func DragAcceptFiles(hwnd HWND, accept bool) {
procDragAcceptFiles.Call(
uintptr(hwnd),
uintptr(BoolToBOOL(accept)))
}
func DragQueryFile(hDrop HDROP, iFile uint) (fileName string, fileCount uint) {
ret, _, _ := procDragQueryFile.Call(
uintptr(hDrop),
uintptr(iFile),
0,
0)
fileCount = uint(ret)
if iFile != 0xFFFFFFFF {
buf := make([]uint16, fileCount+1)
ret, _, _ := procDragQueryFile.Call(
uintptr(hDrop),
uintptr(iFile),
uintptr(unsafe.Pointer(&buf[0])),
uintptr(fileCount+1))
if ret == 0 {
panic("Invoke DragQueryFile error.")
}
fileName = syscall.UTF16ToString(buf)
}
return
}
func DragQueryPoint(hDrop HDROP) (x, y int, isClientArea bool) {
var pt POINT
ret, _, _ := procDragQueryPoint.Call(
uintptr(hDrop),
uintptr(unsafe.Pointer(&pt)))
return int(pt.X), int(pt.Y), (ret == 1)
}
func DragFinish(hDrop HDROP) {
procDragFinish.Call(uintptr(hDrop))
}
func ShellExecute(hwnd HWND, lpOperation, lpFile, lpParameters, lpDirectory string, nShowCmd int) error {
var op, param, directory uintptr
if len(lpOperation) != 0 {
op = uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpOperation)))
}
if len(lpParameters) != 0 {
param = uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpParameters)))
}
if len(lpDirectory) != 0 {
directory = uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpDirectory)))
}
ret, _, _ := procShellExecute.Call(
uintptr(hwnd),
op,
uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpFile))),
param,
directory,
uintptr(nShowCmd))
errorMsg := ""
if ret != 0 && ret <= 32 {
switch int(ret) {
case ERROR_FILE_NOT_FOUND:
errorMsg = "The specified file was not found."
case ERROR_PATH_NOT_FOUND:
errorMsg = "The specified path was not found."
case ERROR_BAD_FORMAT:
errorMsg = "The .exe file is invalid (non-Win32 .exe or error in .exe image)."
case SE_ERR_ACCESSDENIED:
errorMsg = "The operating system denied access to the specified file."
case SE_ERR_ASSOCINCOMPLETE:
errorMsg = "The file name association is incomplete or invalid."
case SE_ERR_DDEBUSY:
errorMsg = "The DDE transaction could not be completed because other DDE transactions were being processed."
case SE_ERR_DDEFAIL:
errorMsg = "The DDE transaction failed."
case SE_ERR_DDETIMEOUT:
errorMsg = "The DDE transaction could not be completed because the request timed out."
case SE_ERR_DLLNOTFOUND:
errorMsg = "The specified DLL was not found."
case SE_ERR_NOASSOC:
errorMsg = "There is no application associated with the given file name extension. This error will also be returned if you attempt to print a file that is not printable."
case SE_ERR_OOM:
errorMsg = "There was not enough memory to complete the operation."
case SE_ERR_SHARE:
errorMsg = "A sharing violation occurred."
default:
errorMsg = fmt.Sprintf("Unknown error occurred with error code %v", ret)
}
} else {
return nil
}
return errors.New(errorMsg)
}
func ExtractIcon(lpszExeFileName string, nIconIndex int) HICON {
ret, _, _ := procExtractIcon.Call(
0,
uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpszExeFileName))),
uintptr(nIconIndex))
return HICON(ret)
}
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