使用GetOpenFileName而不是OpenFileDialog [英] Using GetOpenFileName instead of OpenFileDialog
问题描述
我无法在应用程序中使用OpenFileDialog。
I can't use OpenFileDialog in my application.
作为替代方案，我使用GetOpenFileName（）方法：
As an alternative I use GetOpenFileName() method:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace Reader
{
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class OpenFileName
{
public int lstructSize;
public IntPtr hwndOwner;
public IntPtr hInstance;
public string lpstrFilter = null;
public string lpstrCustomFilter = null;
public int lMaxCustomFilter;
public int lFilterIndex;
public string lpstrFile = null;
public int lMaxFile = 0;
public string lpstrFileTitle = null;
public int lMaxFileTitle = 0;
public string lpstrInitialDir = null;
public string lpstrTitle = null;
public int lFlags;
public ushort nFileOffset;
public ushort nFileExtension;
public string lpstrDefExt = null;
public int lCustData;
public int lpfHook;
public int lpTemplateName;
}
public class OpenDialog
{
[DllImport("Comdlg32.dll",CharSet = CharSet.Auto)]
public static extern bool GetOpenFileName([In, Out] OpenFileName ofn);
}
}
然后在按钮之类的OnClick事件中使用它
And then use it in OnClick event of a button like this:
OpenFileName qofn = new OpenFileName();
qofn.lstructSize = Marshal.SizeOf(qofn);
qofn.lpstrFile = "";
qofn.lMaxFile = 256;
qofn.lpstrFileTitle = "";
qofn.lMaxFileTitle = 64;
qofn.hInstance = this.Handle;
source.Text = "Wait...";
if (OpenDialog.GetOpenFileName(qofn))
{
MessageBox.Show("ofn.file: " + qofn. lpstrFile );
}
当应用程序运行并单击按钮并尝试打开文件时，这就是发生：
When application runs and button is clicked and I try to open file this is what happens:
第一次尝试：
它将返回我文件的路径，但是我有
c：\dira\dirb\dircfilename.ext
而不是
c：\dira\dirb\dirc\filename.ext
b'在文件名之前
it returns the path to my file, but instead of c:\dira\dirb\dirc\filename.ext I have c:\dira\dirb\dircfilename.ext without '\' before the name of the file
第二次尝试
一切都是OK
下一步：
随机崩溃，例如
next: there are random crashes, e.g. random access violation, or GUI freezes and application's process can't be kiled even in task manager, or other errors.
通常，对话框会在应用程序崩溃之前运行2-3次，否则，即使在任务管理器中，GUI也冻结，并且应用程序的进程也不会被扼杀。
Usually dialog works 2-3 times before application crashes for good.
我的代码有什么问题？
编辑：
我不能使用OpenFileDialog。我正在使用WinPE 4.0（Windows评估和部署工具包ADK）。当我尝试使用OpenFileDIalog时，它会引发运行时错误 80040111 。可能是因为不支持核心（就像Server Core不支持OpenFileDialog一样，错误也一样）。可能在WinPE 4.0上，它们在记事本等应用程序中使用GetOpenFileName。
I can't use OpenFileDialog. I'm using WinPE 4.0 (Windows Assessment and Deployment Kit ADK). When I try OpenFileDIalog, it throws run time error 80040111. It's probably because the core is not supported (just like Server Core doesn't support OpenFileDialog, the error's the same). Probably on WinPE 4.0 they use GetOpenFileName in applications such as notepad. And it works for them.
推荐答案
好，我找到了这个Microsoft示例，并且可以正常工作：
OK, I found this microsoft sample and it works:
// Copyright
// Microsoft Corporation
// All rights reserved
// OpenFileDlg.cs
using System;
using System.Text;
using System.Runtime.InteropServices;
/*
typedef struct tagOFN {
DWORD lStructSize;
HWND hwndOwner;
HINSTANCE hInstance;
LPCTSTR lpstrFilter;
LPTSTR lpstrCustomFilter;
DWORD nMaxCustFilter;
DWORD nFilterIndex;
LPTSTR lpstrFile;
DWORD nMaxFile;
LPTSTR lpstrFileTitle;
DWORD nMaxFileTitle;
LPCTSTR lpstrInitialDir;
LPCTSTR lpstrTitle;
DWORD Flags;
WORD nFileOffset;
WORD nFileExtension;
LPCTSTR lpstrDefExt;
LPARAM lCustData;
LPOFNHOOKPROC lpfnHook;
LPCTSTR lpTemplateName;
#if (_WIN32_WINNT >= 0x0500)
void * pvReserved;
DWORD dwReserved;
DWORD FlagsEx;
#endif // (_WIN32_WINNT >= 0x0500)
} OPENFILENAME, *LPOPENFILENAME;
*/
[ StructLayout( LayoutKind.Sequential, CharSet=CharSet.Auto )]
public class OpenFileName
{
public int structSize = 0;
public IntPtr dlgOwner = IntPtr.Zero;
public IntPtr instance = IntPtr.Zero;
public String filter = null;
public String customFilter = null;
public int maxCustFilter = 0;
public int filterIndex = 0;
public String file = null;
public int maxFile = 0;
public String fileTitle = null;
public int maxFileTitle = 0;
public String initialDir = null;
public String title = null;
public int flags = 0;
public short fileOffset = 0;
public short fileExtension = 0;
public String defExt = null;
public IntPtr custData = IntPtr.Zero;
public IntPtr hook = IntPtr.Zero;
public String templateName = null;
public IntPtr reservedPtr = IntPtr.Zero;
public int reservedInt = 0;
public int flagsEx = 0;
}
public class LibWrap
{
//BOOL GetOpenFileName(LPOPENFILENAME lpofn);
[ DllImport( "Comdlg32.dll", CharSet=CharSet.Auto )]
public static extern bool GetOpenFileName([ In, Out ] OpenFileName ofn );
}
public class App
{
public static void Main()
{
OpenFileName ofn = new OpenFileName();
ofn.structSize = Marshal.SizeOf( ofn );
ofn.filter = "Log files\0*.log\0Batch files\0*.bat\0";
ofn.file = new String( new char[ 256 ]);
ofn.maxFile = ofn.file.Length;
ofn.fileTitle = new String( new char[ 64 ]);
ofn.maxFileTitle = ofn.fileTitle.Length;
ofn.initialDir = "C:\\";
ofn.title = "Open file called using platform invoke...";
ofn.defExt = "txt";
if( LibWrap.GetOpenFileName( ofn ))
{
Console.WriteLine( "Selected file with full path: {0}", ofn.file );
Console.WriteLine( "Selected file name: {0}", ofn.fileTitle );
Console.WriteLine( "Offset from file name: {0}", ofn.fileOffset );
Console.WriteLine( "Offset from file extension: {0}", ofn.fileExtension );
}
}
}
这篇关于使用GetOpenFileName而不是OpenFileDialog的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
