Firstly, thanks for a superb project!
I've noticed that as the HWND isn't specified, it can sometime appear beneath my application window. How easy would it be to add a method to set the parent HWND? Perhaps as a property on cfd.DialogConfig? Cheers.

I'm trying to create an small application providing a file chooser, and I saw an unexpected error only on 386 binary running on Windows 10 64bit.
An amd64 binary built from the same source running on Windows 10 64bit works as expected.
Should this error be tracked on this project? Or, should I report this to other place?

Thanks,

Steps to reproduce

1. Prepare a golang development environment. I'm using go1.16.6 linux/amd64 on Ubuntu on WSL1 on Windows 10.

2. Create testcase.go under a directory, as:

   package main
   
   import (
   	"github.com/harry1453/go-common-file-dialog/cfd"
   	"github.com/harry1453/go-common-file-dialog/cfdutil"
   	"log"
   )
   
   func main() {
   	result, err := cfdutil.ShowOpenFileDialog(cfd.DialogConfig{
   		Title: "Title",
   		Role:  "TestCaseRole",
   		FileFilters: []cfd.FileFilter{
   			{
   				DisplayName: "File",
   				Pattern:     "*.*",
   			},
   		},
   		SelectedFileFilterIndex: 0,
   		FileName:                "file",
   		DefaultExtension:        ".txt",
   	})
   	log.Fatal(err)
   	log.Fatal(result)
   }
   

3. Start bash on Ubuntu on WSL1.

4. Change working directory to the directory testcase.go placed at.

5. Run gox -os="windows" . to build binaries.

6. Then two binaries golang-testcase_windows_amd64.exe and golang-testcase_windows_386.exe are built.

7. Start cmd.exe on Windows.

8. Run golang-testcase_windows_amd64.exe on the command prompt. A file chooser dialog appears, so close it.

9. Run golang-testcase_windows_386.exe on the command prompt.

Expected result

A file chooser dialog appears, same as golang-testcase_windows_amd64.exe.

Actual result

No dialog appears and an error:

C:\Users\piro>>C:\Users\piro\golang-testcase_windows_386.exe
Exception 0xc0000005 0x0 0x140d8b64 0x779cef90
PC=0x779cef90

syscall.Syscall(0x75d08a90, 0x2, 0x1222df0, 0x1, 0x11c06290, 0x0, 0x0, 0x0)
        /usr/local/go/src/runtime/syscall_windows.go:330 +0xbb
github.com/harry1453/go-common-file-dialog/cfd.(*iFileDialogVtbl).setFileTypes(0x75cc18b4, 0x1222df0, 0x11c04180, 0x1, 0x1, 0x1, 0x31d44c50)
        /home/piro/go/src/github.com/harry1453/go-common-file-dialog/cfd/vtblCommonFunc.go:51 +0x11e
github.com/harry1453/go-common-file-dialog/cfd.(*iFileOpenDialog).SetFileFilters(0x1222df0, 0x11c04180, 0x1, 0x1, 0x1222df0, 0x11c06201)
        /home/piro/go/src/github.com/harry1453/go-common-file-dialog/cfd/iFileOpenDialog.go:104 +0x41
github.com/harry1453/go-common-file-dialog/cfd.(*DialogConfig).apply(0x11c5deb8, 0x410754, 0x1222df0, 0x0, 0x0)
        /home/piro/go/src/github.com/harry1453/go-common-file-dialog/cfd/DialogConfig.go:99 +0xef
github.com/harry1453/go-common-file-dialog/cfd.NewOpenFileDialog(0x3e659e, 0x5, 0x3e7965, 0xc, 0x0, 0x0, 0x0, 0x0, 0x11c04180, 0x1, ...)
        /home/piro/go/src/github.com/harry1453/go-common-file-dialog/cfd/CommonFileDialog_windows.go:20 +0x76
github.com/harry1453/go-common-file-dialog/cfdutil.ShowOpenFileDialog(0x3e659e, 0x5, 0x3e7965, 0xc, 0x0, 0x0, 0x0, 0x0, 0x11c04180, 0x1, ...)
        /home/piro/go/src/github.com/harry1453/go-common-file-dialog/cfdutil/CFDUtil.go:9 +0x68
main.main()
        /home/piro/testcase.go:16 +0x8e
eax     0x140d8b64
ebx     0x0
ecx     0x1222de4
edx     0x140d8b66
edi     0x140d8b64
esi     0x0
ebp     0x10ff9d8
esp     0x10ff9d4
eip     0x779cef90
eflags  0x10202
cs      0x23
fs      0x53
gs      0x2b

C:\Users\piro>

Environment

• host OS: Windows 10 Pro 21H1 (64bit)
• guest OS: Ubuntu 18.04.5 LTS (on WSL1)
• go: 1.16.6 linux/amd64
• go-common-file-dialog revision: 5bfd608

Additional info

I've not tested this on 32bit Windows environment yet.

Currently, if the user presses cancel or closes a dialog, it returns an error with the text "cancelled by user". It would be great if Show() returned a flag indicating if it was cancelled. I realise this would be an API breaking change!

Added here wailsapp/wails#2814

Ola, when using this module, it seems that cfd.ErrorCancelled is no longer supported:

if err == cfd.ErrorCancelled { //<--- ErrorCancelled not declared by package cfdcompiler[UndeclaredImportedName]
   log.Fatal("Dialog was cancelled by the user.")
}

Is there an alternative way to check if a dialog was cancelled?
It could just be a mistake on my end, this is literally my first go project