Search for files via API ?

[Pirate]

I got this part working in VB.NET , for many reasons , I couldn't convert it to C#. Anyone got code that looks for files via API ?

Thanks .

[DevGrp]

Post the VB.NET code. I'll take a stab at it.

[Pirate]

First , nevermind about the GoTo statement .

Private Declare Function SearchTreeForFile Lib "IMAGEHLP.DLL" (ByVal lpRootPath As String, ByVal lpInputName As String, ByVal lpOutputName As String) As Integer
 
    Private Const MAX_PATH As Short = 260
 
    Public Function FindFile(ByRef RootPath As String, ByRef FileName As String) As String
 
        Dim lNullPos As Integer
        Dim lResult As Integer
        Dim sBuffer As String
 
        On Error GoTo FileFind_Error
 
        'Allocate buffer
        sBuffer = Space(MAX_PATH * 2)
 
        'Find the file
        lResult = SearchTreeForFile(RootPath, FileName, sBuffer)
 
        'Trim null, if exists
        If lResult Then
            'VB6 Code
            'lNullPos = InStr(sBuffer, vbNullChar)
            'MsgBox(lNullPos)
 
            ..NET code
            lNullPos = sBuffer.IndexOf(Nothing) + 1
 
            If Not lNullPos Then
                'VB6 Code
                'sBuffer = VB.Left(sBuffer, lNullPos - 1)
 
                ..NET code
                sBuffer = sBuffer.Substring(0, lNullPos - 1)
            End If
            'Return filename
            FindFile = sBuffer
        Else
            'Nothing found
            FindFile = vbNullString
 
        End If
 
        Exit Function
 
FileFind_Error:
        FindFile = vbNullString
 
    End Function

For C# part :

[DllImport("IMAGEHLP.DLL")]
public static extern int SearchTreeForFile(string lpRootPathtring, string lpInputName , string lpOutputName ) ;
private const short MAX_PATH  = 260;

//The rest is junk..lol

Thanks DevGrp .

[Pirate]

I thought , it'll be easier job to use this ready proj to try out .

Usage : you'll find two textboxes , in the 1# type : C: (without backslash) , in the 2# type file name : setup.txt , then click the botton , if the file was found , msgbox will popup , if not , empty msgbox will show up . (don't worry , it won't take much time .It's damn fast ) .

[dynamic_sysop]

why not use System.IO.FileInfo? eg:

private void button1_Click(object sender, System.EventArgs e)
{
    System.IO.FileInfo f=new System.IO.FileInfo("C:\\test.txt");
    if (f.Exists)
    {
        MessageBox.Show("Found your file!");
    }
    else
    {
                    MessageBox.Show("it dont exsist!");
    }
}

[dynamic_sysop]

you can also specify directories btw eg :

private void FindStuff(string dir ,string path)
{
            System.IO.DirectoryInfo D=new System.IO.DirectoryInfo(dir);
            System.IO.FileInfo f=new System.IO.FileInfo(path);
}

[Pirate]

API is faster (very fast) . Your code needs the user to provide the full path , I mean it won't search all folder as the API . I know I can search the entire folders but still slow . Can you help me to convert VB code to C# ?

Thanks dynamic_sysop

[dynamic_sysop]

you mean something like this? :

[DllImport("IMAGEHLP.DLL")]
public static extern int SearchTreeForFile(string lpRootPathtring, string lpInputName , StringBuilder lpOutputName );
 
 
private void button2_Click(object sender, System.EventArgs e)
{
FindFile("C:\\","myTextFile.txt");
}
 
public void FindFile(string RootPath ,string FileName)
{ 
 
int lResult=0;
StringBuilder sBuffer=new StringBuilder(256);
            
lResult = SearchTreeForFile(RootPath ,FileName ,sBuffer);
 
if (lResult!=0)
{
MessageBox.Show(sBuffer.ToString());
}
}

[Pirate]

It works only if the file is existed on the root partition , otherwise it returns nothing .

[DevGrp]

When I download the program, it was getting errors, so I made a few changes and it compiled. Everything seem to be working, except that I'm getting an exception if the file is not found. I cant seem to find a work around for the Space function.

I also add a delegate and a callback function to do the search asynchronously, because it was whiting out the screen.

Here is the update.

[Pirate]

How did you use it ? I typed C: and the file name but shows empty msgbox (although the file is on the root partition ) ??

[DevGrp]

The same thing happened for me, but if the file is not found I get an exception.

[crpietschmann]

Check out my site, it's a great place for learning about Windows API calls.

www.PietschSoft.com/FunctionGuide

[Pirate]

Originally posted by DevGrp
The same thing happened for me, but if the file is not found I get an exception.

Hmm , so you didn't get it working (it doesn't look for files), did you ?

[Pirate]

Originally posted by crpietschmann
Check out my site, it's a great place for learning about Windows API calls.
www.PietschSoft.com/FunctionGuide

Your website is amazing . But I can't seem to find anything related to what's here .

[DevGrp]

Originally posted by Pirate
Hmm , so you didn't get it working (it doesn't look for files), did you ?

Well I really dont know . I made a text file name setup.txt on my c drive. The program found it, but the Messagebox was blank.

[crpietschmann]

Originally posted by Pirate
Your website is amazing . But I can't seem to find anything related to what's here .

Thanks!!

I'm sorry that there is nothing related to this there. At the moment I only have about 16 Function calls in the Function Guide. I am slowly adding like 1 or 2 a day. It's hard work. I have to add VB6, VB.NET, and C#.NET code, and I even have code examples for some of them.

I encourage you to check it out. If you have certain Functions that you would like added to the Function Guide, just feel free to email me. I have an email link at the site. Any Function suggestions I get, will be added first.

www.PietschSoft.com/FunctionGuide

[Pirate]

Originally posted by DevGrp
Well I really dont know . I made a text file name setup.txt on my c drive. The program found it, but the Messagebox was blank.

So , it's not working properly . The msgbox will show up in both cases : found(file name on the msgbox) or not found(empty msgbox) .