Visual Basic

johnjsm25-Feb-04 22:17

25-Feb-04 22:17

I am trying to get a combined CRC for all the files. I am using the FastCRC library to try get the code to work. So far I can get the crc of a single file I have tried to code it to check the directory but it never works so I usually start from scratch again.

Dave Kreskowiak26-Feb-04 1:24

26-Feb-04 1:24

Code samples are important so we can see what your doing!

Your going to have to get the CRC of each file, one at a time. I downloaded the FastCRC library and according to the docs your can use FCRC32_CalculateFile to get the CRC of each file. This is a little pseudocode to illustrate:

' Assuming VB.NET
Dim checksum as Integer
 
FCRC32_Init()
 
For Each Filename in Directory
    FCRC32_CalculateFile( checksum, Filename )
Next
 
MsgBox( FCRC32_LongToHex32( checksum, True ) )

RageInTheMachine9532

johnjsm26-Feb-04 5:24

26-Feb-04 5:24

This is the main code that I was using

Private Sub cmdCRC32_click()
Dim checksum As Long
Dim buffer As Long
If txtFileInfo.Text = "" Then
MsgBox "PLEASE SELECT A FILE", vbExclamation, "No File Selected"
End If

'Calculate the CRC32 checksum and MD5 of a file
If FCRC32_CalculateFile(checksum, txtFileInfo.Text) = 0 Then
txtInfo.Text = txtFileInfo.Text & vbCrLf & _
"CRC32= " & FCRC_LongToHex32(checksum, True) & vbCrLf & _
"MD5=" & QHASH_FileHexDigest(MD5_ALGID, txtFileInfo.Text, True)
End If

End Sub

Thanks

Dave Kreskowiak26-Feb-04 8:27

26-Feb-04 8:27

So far, it looks good, though you can drop the declaration for 'buffer'. You'll never use it...

Now all you need to is to wrap this in code that goes thru a list of filenames and your all set. You can use the Dir() function to do this:

' Assuming VB.NET
' For VB6, change Integer type to Long
Dim iCheckSum As Integer
Dim strFilename As String
 
    FCRC32_Init()
    strFilename = Dir( startingPathAsString )
    Do While strFilename <> ""
        FCRC32_CalculateFile( iCheckSum, Filename )
        strFilename = Dir()
    Loop
 
    MsgBox( "CRC32: " & FCRC32_LongToHex32( iCheckSum, True ) )

RageInTheMachine9532

johnjsm4-Mar-04 4:28

4-Mar-04 4:28

I'm still having huge problems using the dir function. Is there a sample of code i could get

Dave Kreskowiak4-Mar-04 5:45

4-Mar-04 5:45

You'll have to post what you have so we can see what your doing. The only code example I have is in my previous post.

RageInTheMachine9532

r i s h a b h s26-Feb-04 19:07

r i s h a b h s

26-Feb-04 19:07

can u plz. tell me wots CRC32

rIsHaBh

Dave Kreskowiak27-Feb-04 4:13

27-Feb-04 4:13

It's a 32 bit Cyclic Redundancy Check. Its used to give a block of data a value that represent an error check. The block of data is transmitted with it's CRC value, then the receiver gets the block, performs a CRC calculation on it and compares that value with the CRC that was transmitted with the block of data. If the two don't match, there was problem with the transmission.

RageInTheMachine9532

johnjsm29-Feb-04 1:52

29-Feb-04 1:52

CRC stands for Cyclic Redundency Check. Where I work we use it to check .iso files transfered over the network to make sure that it is the same. If anything happened to it in transfer there would be a difference. So if the CRC32 is the same then the file is the same. It can be used to check all the files on a cd also, so if any file changed in creating a cd the CRC32 checksum would be different than that of the master disc.

CodeProject Champs!! Can u solve this Crystal Report Problem?

r i s h a b h s1-Mar-04 17:08

r i s h a b h s

1-Mar-04 17:08

Thank u buddies!!

rIsHaBh

reading from a database

Anonymous25-Feb-04 4:28

Anonymous

25-Feb-04 4:28

i'm srying to read a table from a sql database. i'm using a sqldataadapter, what code should i put in the page load for this to work

Het210925-Feb-04 1:14

Het2109

25-Feb-04 1:14

Hi CodeProject Champs

I want to deploy Crystal Report with my software. I got registered on the site www.crystaldecisions.com/net/licensing. After deployment it was giving error "Invalid Keycode". When I registered they send me a pdf named net_distribution_license.pdf file. But it does not have any keycode. How shud i proceed? From where to get the key code for crystal report.

thanks

Smile | :)

Be Humble in Victory and Strong in Defeat. Smile | :)

-Het

SOAP Prefix problem...

Orkun GEDiK25-Feb-04 1:10

Orkun GEDiK

25-Feb-04 1:10

Hi,

I have been added a web reference. VB.NET has been created a proxy class in my project. But I need to declare prefix for an element. How can I add prefix into an element such as below by VB.NET?

I want to following form;

<RFC_GET_TRUSTED_SYSTEM_ID.Response xmlns="urn:sap-com:document:sap:rfc:functions">

To following form;

<x:RFC_GET_TRUSTED_SYSTEM_ID.Response x:xmlns="urn:sap-com:document:sap:rfc:functions">

Thank you

Orkun GEDiK

Someone Please help Tasnim in this board!!

Het210925-Feb-04 1:09

Het2109

25-Feb-04 1:09

hi,

her problem of M-DAC is really not working out, please please please help her out.

Thanks to all for reading

Smile | :)

Be Humble in Victory and Strong in Defeat. Smile | :)

-Het

Re: how to create a table in sql server database by using visual basic

steff kamush25-Feb-04 6:15

steff kamush

25-Feb-04 6:15

'//Connecting to sqlserver thru ADO

Dim sConnectionstring As String
Dim rst As New ADODB.Recordset 'will hold records returned
Dim com As New ADODB.Command 'will pass command to sql server
Dim cn As New ADODB.Connection 'our database connection object

sConnectionstring = "Uid=Yourusername; pwd=Yourpassword;" & _
"InitialCatalog=Yourdatabase;" & _
"Data Provider=SQLOLEDB; provider=MSDATASHAPE;" & _
"Server=Your-server-if-any;"

cCnn.ConnectionString = sVarConnectionString
cCnn.Open

With com
.ActiveConnection = cn
.CommandText = "SELECT * FROM your-table"
.CommandTimeout = 0 '//don't time-out
.CommandType = adCmdText '//exec the text
End With

rstGP.Open com '//open the recordset

'//accessing the data in rst
If Not rst.BOF And Not rst.EOF Then rst.MoveFirst

While (Not rst.EOF)
MsgBox "Field1 = " & rst!Field1 '//Field1 is a colum in the table
MsgBox "Field2 = " & rst!Field2 '//Field2 is a colum in the table
MsgBox "Field3 = " & rst!Field3
MsgBox "Fieldn = " & rst!Fieldn
rst.MoveNext
Wend

'//Creating a table..

CREATE TABLE
[ database_name.[ owner ] . | owner. ] table_name
( { < column_definition >
| column_name AS computed_column_expression
| < table_constraint > ::= [ CONSTRAINT constraint_name ] }

| [ { PRIMARY KEY | UNIQUE } [ ,...n ]
)

e.g. assume my database is called db1 - i can create table tb1 with
2 columns col1 and col2

CREATE TABLE
db1 tb1
(
col1 AS INT,
col2 AS VARCHAR(100) NOT null
)

'//xml
Don know much about xml..

Rose | [Rose]

1fm1fu

Changing cells in a event handler under Excel

R.Schmidt24-Feb-04 22:22

R.Schmidt

24-Feb-04 22:22

Hello,

I programmed a click event handler for a button on a worksheet. In this handler I wanted to change some cells. But when the handler changed the first cell it aborted directly after the comand.

Here's my code:

This is the event handler itself, it is calling another function that is doing the work:

Private Sub bReorgWorkTime_Click()
ReorgWorkTime bReorgWorkTime.Parent
End Sub

Public Function ReorgWorkTime(xButtonWorksheet As Worksheet)
Dim iDay As Integer
Dim xWorkTime As Variant
Dim xReorgedTime As Variant
Dim dWorkTime As Double
Dim bOldEventsEnabled As Boolean

iDay = ROW_DAY_1

bOldEventsEnabled = Application.EnableEvents
Application.EnableEvents = False

' Fill in all days without over times:
While (iDay <= ROW_DAY_31)
xWorkTime = xButtonWorksheet.Cells(iDay, COL_WORKED_TIME)

If (IsNumeric(xWorkTime) And Not IsEmpty(xWorkTime)) Then
dWorkTime = xWorkTime
xButtonWorksheet.Cells(iDay, COL_REORGED_TIME) = dWorkTime
' Aborts here
Else
xButtonWorksheet.Cells(iDay, COL_REORGED_TIME) = ""
' or here
End If
iDay = iDay + 1
Wend

Application.EnableEvents = bOldEventsEnabled
End Function

Believing the debugger the "iDay = iDay + 1" line isn't even reached!

I use Excel 2002 SP-1 German

Convert heximal

erikkloeze24-Feb-04 21:46

erikkloeze

24-Feb-04 21:46

How can you convert a heximal string to a "normal string"???

For example, I've got a register file which contains the following:

[HKEY_LOCAL_MACHINE\SOFTWARE\ORL\WinVNC3\Default]
"Password"=hex:88,bf,a4,48,1a,4b,4d,4d

So, I want to know how you can convert the heximal string "88,bf,a4,48,1a,4b,4d,4d" into just normal letters and numers...

And I'm using VB 6.0!!!!!

(¯`·._.·[eRiK]·._.·´¯)

jzsmith3324-Feb-04 22:18

jzsmith33

24-Feb-04 22:18

Friend Function HexToStr(ByVal strHex As String) As String

Dim i As Integer
Dim sb As New System.Text.StringBuilder(strHex.Length \ 2)
For i = 0 To strHex.Length - 2 Step 2
sb.Append(Microsoft.VisualBasic.Chr(Convert.ToByte(strHex.Substring(i, 2), 16)))
Next

Return sb.ToString

End Function

Matthew Hazlett24-Feb-04 22:33

Matthew Hazlett

24-Feb-04 22:33

Didn't see and unhex functions built in so you have to build one

vb.net"

Private Function unHex(ByVal hexStr As String) As Integer
    Dim position As Integer = 1
    Dim Result As Integer = 0

    While Not position > hexStr.Length
        Dim thisChar As Char = Mid(hexStr, position, 1)

        Select Case UCase(thisChar)
            Case "A"
                Result += 10 * (16 ^ (hexStr.Length - position))
            Case "B"
                Result += 11 * (16 ^ (hexStr.Length - position))
            Case "C"
                Result += 12 * (16 ^ (hexStr.Length - position))
            Case "D"
                Result += 13 * (16 ^ (hexStr.Length - position))
            Case "E"
                Result += 14 * (16 ^ (hexStr.Length - position))
            Case "F"
                Result += 15 * (16 ^ (hexStr.Length - position))
            Case Else
                Result += Val(thisChar) * (16 ^ (hexStr.Length - position))
        End Select

        position += 1
    End While

    Return Result
End Function

This will take as input a hexstring of any length and give you a result as an integer.

ex. unHex("C17") = 3096
ex. unHex("C17BD") = 792509

Matthew Hazlett
Windows 2000/2003 MCSE
Never got an MCSD, go figure...

erikkloeze24-Feb-04 23:14

erikkloeze

24-Feb-04 23:14

One more thing, I'm using VB 6.0, NOT .NET!!!!

And I don't only want them to be converted into numbers, nut just into a string, for example a word!!!

eRiK

Dave Kreskowiak25-Feb-04 7:06