| Newbie | | Join Date: Nov 2007
Posts: 4
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hello everybody
I am having a very wierd problem.i am developing a win ce applicationin which I am marshalling win ap function findfirstfile and findnextfile in c# .My problem is it reads the file name but it misses the first 2 characters of each file name.I have no idea why .Please help. -
using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Text;
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using System.Windows.Forms;
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using System.Runtime.InteropServices;
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namespace dummy2
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{
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public partial class Form1 : Form
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{
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int rfidTagHandle;
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Win32Methods.WIN32_FIND_DATA FindFileData;
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public Form1()
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{
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InitializeComponent();
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}
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private void button1_Click(object sender, EventArgs e)
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{
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//for (int i = 0; i <= 2; i++)
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//{
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rfidTagHandle = Win32Methods.FindFirstFile("*.*", out FindFileData);
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//"\\RFID\\[.]"
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if (rfidTagHandle == Win32Methods.INVALID_HANDLE_VALUE)
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{
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MessageBox.Show("FindFirstFile failed");
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}
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else
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{
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String fileName = FindFileData.cFileName;
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//MessageBox.Show("File name length is" + FindFileData.cFileName.Length.ToString());
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//textBox1.Text = "Application" + "\r\n";
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textBox1.Text = textBox1.Text + fileName + "\r\n";
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}
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while (Win32Methods.FindNextFile(rfidTagHandle, out FindFileData) != false)
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{
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String fileName = FindFileData.cFileName;
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textBox1.Text = textBox1.Text + fileName + "\r\n";
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//MessageBox.Show("next File name is" + fileName);
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//listView1.Items.Add(fileName);
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}
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MessageBox.Show("FindnextFile failed");
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Win32Methods.FindClose(rfidTagHandle);
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// }
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}
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}
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public class Win32Methods
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{
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public const int INVALID_HANDLE_VALUE = -1;
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[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
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public struct WIN32_FIND_DATA
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{
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public int dwFileAttributes;
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public FILETIME ftCreationTime;
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public FILETIME ftLastAccessTime;
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public FILETIME ftLastWriteTime;
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public int nFileSizeHigh;
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public int nFileSizeLow;
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public int dwReserved0;
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public int dwReserved1;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
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public string cFileName;
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//[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
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//public string cAlternateFileName;
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};
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[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
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public struct FILETIME
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{
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public uint dwLowDateTime;
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public uint dwHighDateTime;
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};
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//Findfirstfile
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[DllImport("coredll", CharSet = CharSet.Unicode, SetLastError = true)]
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public static extern int FindFirstFile(string szSearchFile, out WIN32_FIND_DATA lpFindFileData);
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//FindNextFile
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[DllImport("coredll", CharSet = CharSet.Unicode, SetLastError = true)]
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[return: MarshalAs(UnmanagedType.Bool)]
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public static extern bool FindNextFile(int hFindFile,out WIN32_FIND_DATA lpFindFileData);
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//Findclose
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[DllImport("coredll", CharSet = CharSet.Unicode)]
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[return: MarshalAs(UnmanagedType.Bool)]
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public static extern bool FindClose(int hFindFile);
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}
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}
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thanks in advance
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