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i am trying to display multi page .tiff file into a pic box. so i have a next button to go to the next page. so far i got this
Dim objImage As System.Drawing.Image = objImage.FromFile("C:\Projects\FaxView\appraisal.tif")
Dim objGuid As Guid
objGuid = (objImage.FrameDimensionsList(0))
Dim objDimension As System.Drawing.Imaging.FrameDimension = New System.Drawing.Imaging.FrameDimension(objGuid)
Dim objBmp As System.Drawing.Bitmap
With objBmp
.FromFile("C:\Projects\FaxView\multipage.tif")
.GetFrameCount(objDimension)
.SelectActiveFrame(objDimension, 1)
End With
it is giving me error: object is not set to object reference at .GetFramecount(objDimension)
any idea why it is saying that? thanks for your ehlp.
Zulfikar Ali
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i figured it out. thanks
Zulfikar Ali
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Ok, I've managed to use the AxMediaPlayer to display my video. Unfortunately, there is absolutely no help or documentation on the methods and properties for the media player. I want to disply the real time frames and/or time as the video is playing. This can be done by displaying the AxMediaPlayer1.CurrentPosition. What I need to figure out is how to update the display as the video is playing. Is this through an event, or do I update the display everytime the AxMediaPlayer1.CurrentPosition is changed? I'm not sure what is the best way to try and do this.
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Ok. I'm a C++ programmer (with a little VB6 experience) that's recently started using VB.NET quite a bit. I have to ask this even though I feel pretty certain that I don't have to worry about it... but I'm not sure just how large the changes are from VB to VB.NET so here we go...
In VB.NET, if I use multiple Timer objects (the new one, not the Forms one) so I can have different times, is there any chance the timers could fire at the same time? Ie, VB.NET is still basically a single threaded application, right? Each run of a fired timer event will NOT be treated as a thread...? I'm just making sure. I'm thinking of doing something a certain way and some of the resources used in each timer are shared so I can't have them stepping on each other. Would another timer fire off while another one is running? Can I stop that behavior (if it exists) with some sort of locking mechanism like a Mutex in C++?
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Are you talking about the System.threading.Timer?
If so, you should have a look at the MSDN regarding them. I just read this.
Use a TimerCallback delegate to specify the methods associated with a Timer. The methods do not execute in the thread that created the timer; they execute in a separate thread that is automatically allocated by the system
If you're talking about the System.Timers.Timer then you're also in trouble
Note The event-handling method may be called even after the Stop method is called. The event-handling method may run on one thread at the same time that a call to the Stop method runs on another thread. This might result in the Elapsed event being raised even after the Stop method is called. To prevent this, use the SignalTime property to compare the time the event was raised to the time the Stop method was called. If the event was raised after the Stop method was called, do not process the event.
Pete
Pete
Insert Sig. Here!
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HI,
In my system, MyNetworkPlaces-> I have few network folders shared for me.
when I click those to view, it prompts the dialogbox to connect to that folder. If I give username and passwork it connects.
so now in my VB.net application, I am asking user to select the network folder, by showing Browse for folder dialog box. The thing is when user selects, any network folder I want to know whether it is connected or not, if not I need to prompt the dialogbox with username and password fileds for connecting to it. so How can I achieve this using vb.net? and what class I need to use for connecting to network folder? I am really struggling for this. Please help me as soon as possible.
For ex:
I want to connect to \\machine1\somefolder
or \\machine2\somefolder, when user selects this folder I need to know whether is it accessinble for user machine, if no i need to prompt the dialog box to connect with username and password as windows shows.
Thanking you
Regards
Praveen P
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Well, I am not sure but I am thinking that no matter how you select that Share, it will prompt you for a User / Password, so you may not have to handle that in your App.
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Ok, I understand that the NetServerEnum API functions do not work on a Win9x machine. In VB6, I had code to enumerate Servers on a Windows9x machine, however, porting it to VB.NET seems impossible. I have it working...somewhat. However, it only enumerates the Top-Level Node everytime!
If someone could please shed some light on what I am doing wrong I would greatly appreciate it! This was all guess-work on my part even though I understand Marshalling a little bit.
Here's what I have so far:
'Declarations
'API Declarations
Private Declare Auto Function GlobalAlloc Lib "kernel32" (ByVal wFlags As Integer, ByVal dwBytes As Integer) As Integer
Private Declare Auto Function GlobalFree Lib "kernel32" (ByVal hMem As Integer) As Integer
'API Declarations for Win9x
Private Declare Ansi Function WNetOpenEnum Lib "mpr.dll" Alias "WNetOpenEnumA" (ByVal dwScope As Integer, ByVal dwType As Integer, ByVal dwUsage As Integer, ByRef lpNetResource As IntPtr, ByRef lphEnum As Integer) As Integer
Private Declare Ansi Function WNetEnumResource Lib "mpr.dll" Alias "WNetEnumResourceA" (ByVal hEnum As Integer, ByRef lpcCount As Integer, ByVal lpBuffer As Integer, ByRef lpBufferSize As Integer) As Integer
Private Declare Ansi Function WNetCloseEnum Lib "mpr.dll" (ByVal hEnum As Integer) As Integer
'Structures
<Runtime.InteropServices.StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi)> _
Private Structure NETRESOURCE
Dim Scope As Integer
Dim Type As Integer
Dim DisplayType As Integer
Dim Usage As Integer
Dim LocalName As IntPtr
Dim RemoteName As IntPtr
Dim Comment As IntPtr
Dim Provider As IntPtr
End Structure
'Constants for WNetEnum
Private Enum ResourceScopes
resConnected = &H1 'All currently connected resources (the dwUsage parameter is ignored)
resGlobalNet = &H2 'All resources on the network.
resRemembered = &H3 'All remembered (persistent) connections (dwUsage is ignored)
resRecent = &H4
resContext = &H5
End Enum
Private Enum ResourceTypes
resAny = &H0 'All resources (this value cannot be combined with RESOURCETYPE_DISK or RESOURCETYPE_PRINT).
resDisk = &H1 'All disk resources.
resPrinter = &H2 'All print resources.
resReserved = &H8
resUnknown = &HFFFF
End Enum
Private Enum ResourceUseages 'Ignored if the ResourceScope is not 'resGlobalNet'
resAll = ((&H1) Or (&H2))
resConnectable = &H1
resContainer = &H2
resNoLocalDevice = &H4
resSibling = &H8
resReserved = &H80000000
End Enum
Private Enum ResourceDisplayTypes 'Used to Determine the Resource Type of the NETRESOURCE Struct
resGeneric = &H0
resDomain = &H1
resServer = &H2
resShare = &H3
resFile = &H4
resGroup = &H5
resNetwork = &H6
resRoot = &H7
resShareAdmin = &H8
resDirectory = &H9
resTree = &HA
End Enum
'Enumerations
Public Enum ServerTypes
All = &HFFFFFFFF '/* handy for NetServerEnum2 */
Browsers = &H10000
Browser_Backup = &H20000
Browser_Master = &H40000
Domains = &H80000000
DomainController = &H8
DomainBackController = &H10
DomainMaster = &H80000
DomainMember = &H100
Novell = &H80
NTClusters = &H1000000 '/* NT Cluster */
Servers = &H2 ' All Servers
ServersDialIn = &H400
ServersLocal = &H40000000
ServersPrintQ = &H200
ServersNT = &H8000
ServersSQL = &H4 ' SQL Server
ServersXenix = &H800
ServersUnix = &H800
TimeServers = &H20
Workstations = &H1
WorkstationsNT = &H1000
WorkstationsWin9x = &H400000 '/* Windows95 and above */
End Enum
'Routine to Refresh Servers on a Win9x Machine (uses Recursion)
Private Sub RefreshServersWin9x(Optional ByVal Domain As String = Nothing)
Dim vResource As NETRESOURCE
Dim hResult, hEnum, hBuffer, hPointer, i As Integer
Dim nBufferSize As Integer = 16384, nCount As Integer = &HFFFFFFFF
Const GMEM_FIXED As Integer = &H0
Const GMEM_ZEROINIT As Integer = &H40
Const GPTR As Integer = (GMEM_FIXED Or GMEM_ZEROINIT)
'Initialize the Buffer Pointer
Dim ptrBuffer As IntPtr = IntPtr.Zero, ptrDomain As IntPtr = IntPtr.Zero
If (Not IsNothing(Domain)) AndAlso (Domain.Length > 0) Then
ptrDomain = Marshal.StringToBSTR(Domain)
ptrBuffer = Marshal.AllocCoTaskMem(Marshal.SizeOf(vResource))
vResource.RemoteName = ptrDomain
Call Marshal.StructureToPtr(vResource, ptrBuffer, True)
End If
Try
hResult = WNetOpenEnum(ResourceScopes.resGlobalNet, ResourceTypes.resAny, ResourceUseages.resContainer, ptrBuffer, hEnum)
If (hResult = 0) And (hEnum <> 0) Then 'Successful
'Enumerate the Resource
hBuffer = GlobalAlloc(GPTR, nBufferSize)
hResult = WNetEnumResource(hEnum, nCount, hBuffer, nBufferSize)
If (hResult = 0) Then 'Successful
hPointer = hBuffer
For i = 0 To nCount - 1
'Retrieve the Information for the Resource
vResource = CType(Marshal.PtrToStructure(New IntPtr(hPointer), GetType(NETRESOURCE)), NETRESOURCE)
'Recurse to Find the Servers if this is a Root or Domain Node
Select Case vResource.DisplayType
Case ResourceDisplayTypes.resDomain, ResourceDisplayTypes.resGroup, ResourceDisplayTypes.resNetwork, ResourceDisplayTypes.resRoot
Call Me.RefreshServersWin9x(Marshal.PtrToStringAnsi(vResource.RemoteName))
End Select
'Determine the Next Pointer
hPointer += Marshal.SizeOf(vResource)
Next i
End If
End If
bInitialized = True
Catch
'Call Globals.ErrorMessage("Refresh")
Finally
'Free Up Memory
Call Marshal.FreeCoTaskMem(ptrBuffer)
Call Marshal.FreeCoTaskMem(ptrDomain)
If (hEnum > 0) Then hResult = WNetCloseEnum(hEnum)
If (hBuffer > 0) Then hResult = GlobalFree(hBuffer)
End Try
End Sub
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Nevermind, I figured this out!
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Hi
I'm writing COM add-in to MsProject2000. The problem is that using Project object I cannot change cursor that appear in MsProject app. I tried to change the cursor by WinAPI calls but I failed. Is this possible to change cursor in MsProject by executing some code from my add-in?
Mariusz Popiolek
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I am using .NET Remoting to access a Class Library that I created in VB.NET. This class library contains a reference to a COM + component that is used by several functions. I am able to get the Remoting to work for most functions but as soon as I try and call a function that is using the COM + component the app freezes. I don't get any error messages, it just seems to hang. Is there something I need to do in order to use a COM + component when Remoting?
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Can anyone tell me if it is possible to programatically change folder permission settings in the Registry. If so how?
Andy
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Nope. It's handled by the file system.
"The greatest danger to humanity is humanity without an open mind."
- Ian Mariano
http://www.ian-space.com/
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Does anyone know how to make an application viewable for all resolution?
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If you mean a "springy" form resizing tool, there is much code out there, and several tools as well ...
Here is a google search[^] for you. And in VB.NET, the forms can be layed out to do just that.
"The greatest danger to humanity is humanity without an open mind."
- Ian Mariano
http://www.ian-space.com/
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windows 9x/NT does not support netapi32.dll.
can anyone let me know on how to use netserverenum on these OSs or should i use any other api.
Kindly help.
Thanks in advance.
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well that's absolutely right.
So is there anything that i can do to find the list of SQl servers in the network on these OSs.
Thanks.
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You could try opening up a TCP/IP Socket on the standard SQL Server port (1433) on each machine you find to see if you can connect...or try to open a named pipe to the machine ("\\.\pipe\sql\query" or "\\.\pipe\MSSQL$instancename\sql\query")...if they succeed, it's probably an SQL server ;o)
"The greatest danger to humanity is humanity without an open mind."
- Ian Mariano
http://www.ian-space.com/
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Yes, there is a way to Enumerate Servers on Win9x. However, I can't get the Code I have to work just right in VB.NET. If someone out there can help on this it would be great!!! The only thing it does is it keeps recusing the Top-Level Network Node (i.e. "Microsoft Windows Network" for me).
Here's what I have so far: 
<Code>
'Declarations
'API Declarations
Private Declare Auto Function GlobalAlloc Lib "kernel32" (ByVal wFlags As Integer, ByVal dwBytes As Integer) As Integer
Private Declare Auto Function GlobalFree Lib "kernel32" (ByVal hMem As Integer) As Integer
'API Declarations for Win9x
Private Declare Ansi Function WNetOpenEnum Lib "mpr.dll" Alias "WNetOpenEnumA" (ByVal dwScope As Integer, ByVal dwType As Integer, ByVal dwUsage As Integer, ByRef lpNetResource As IntPtr, ByRef lphEnum As Integer) As Integer
Private Declare Ansi Function WNetEnumResource Lib "mpr.dll" Alias "WNetEnumResourceA" (ByVal hEnum As Integer, ByRef lpcCount As Integer, ByVal lpBuffer As Integer, ByRef lpBufferSize As Integer) As Integer
Private Declare Ansi Function WNetCloseEnum Lib "mpr.dll" (ByVal hEnum As Integer) As Integer
'Structures
<Runtime.InteropServices.StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto)> _
Private Structure NETRESOURCE
Dim Scope As Integer
Dim Type As Integer
Dim DisplayType As Integer
Dim Usage As Integer
Dim LocalName As IntPtr
Dim RemoteName As IntPtr
Dim Comment As IntPtr
Dim Provider As IntPtr
End Structure
'Constants for WNetEnum
Private Enum ResourceScopes
resConnected = &H1 'All currently connected resources (the dwUsage parameter is ignored)
resGlobalNet = &H2 'All resources on the network.
resRemembered = &H3 'All remembered (persistent) connections (dwUsage is ignored)
resRecent = &H4
resContext = &H5
End Enum
Private Enum ResourceTypes
resAny = &H0 'All resources (this value cannot be combined with RESOURCETYPE_DISK or RESOURCETYPE_PRINT).
resDisk = &H1 'All disk resources.
resPrinter = &H2 'All print resources.
resReserved = &H8
resUnknown = &HFFFF
End Enum
Private Enum ResourceUseages 'Ignored if the ResourceScope is not 'resGlobalNet'
resAll = ((&H1) Or (&H2))
resConnectable = &H1
resContainer = &H2
resNoLocalDevice = &H4
resSibling = &H8
resReserved = &H80000000
End Enum
Private Enum ResourceDisplayTypes 'Used to Determine the Resource Type of the NETRESOURCE Struct
resGeneric = &H0
resDomain = &H1
resServer = &H2
resShare = &H3
resFile = &H4
resGroup = &H5
resNetwork = &H6
resRoot = &H7
resShareAdmin = &H8
resDirectory = &H9
resTree = &HA
End Enum
'Enumerations
Public Enum ServerTypes
All = &HFFFFFFFF '/* handy for NetServerEnum2 */
Browsers = &H10000
Browser_Backup = &H20000
Browser_Master = &H40000
Domains = &H80000000
DomainController = &H8
DomainBackController = &H10
DomainMaster = &H80000
DomainMember = &H100
Novell = &H80
NTClusters = &H1000000 '/* NT Cluster */
Servers = &H2 ' All Servers
ServersDialIn = &H400
ServersLocal = &H40000000
ServersPrintQ = &H200
ServersNT = &H8000
ServersSQL = &H4 ' SQL Server
ServersXenix = &H800
ServersUnix = &H800
TimeServers = &H20
Workstations = &H1
WorkstationsNT = &H1000
WorkstationsWin9x = &H400000 '/* Windows95 and above */
End Enum
'Routine to Refresh Servers on a Win9x Machine (uses Recursion)
Private Sub RefreshServersWin9x(Optional ByVal Domain As String = Nothing)
Dim vResource As NETRESOURCE
Dim hResult, hEnum, hBuffer, hPointer, i As Integer
Dim nBufferSize As Integer = 16384, nCount As Integer = &HFFFFFFFF
Const GMEM_FIXED As Integer = &H0
Const GMEM_ZEROINIT As Integer = &H40
Const GPTR As Integer = (GMEM_FIXED Or GMEM_ZEROINIT)
'Initialize the Buffer Pointer
Dim ptrBuffer As IntPtr = IntPtr.Zero, ptrDomain As IntPtr = IntPtr.Zero
If (Not IsNothing(Domain)) AndAlso (Domain.Length > 0) Then
ptrDomain = Marshal.StringToBSTR(Domain)
ptrBuffer = Marshal.AllocCoTaskMem(Marshal.SizeOf(vResource))
vResource.RemoteName = ptrDomain
Call Marshal.StructureToPtr(vResource, ptrBuffer, True)
End If
Try
hResult = WNetOpenEnum(ResourceScopes.resGlobalNet, ResourceTypes.resAny, ResourceUseages.resContainer, ptrBuffer, hEnum)
If (hResult = 0) And (hEnum <> 0) Then 'Successful
'Enumerate the Resource
hBuffer = GlobalAlloc(GPTR, nBufferSize)
hResult = WNetEnumResource(hEnum, nCount, hBuffer, nBufferSize)
If (hResult = 0) Then 'Successful
hPointer = hBuffer
For i = 0 To nCount - 1
'Retrieve the Information for the Resource
vResource = CType(Marshal.PtrToStructure(New IntPtr(hPointer), GetType(NETRESOURCE)), NETRESOURCE)
'Recurse to Find the Servers if this is a Root or Domain Node
Select Case vResource.DisplayType
Case ResourceDisplayTypes.resDomain, ResourceDisplayTypes.resGroup, ResourceDisplayTypes.resNetwork, ResourceDisplayTypes.resRoot
Call Me.RefreshServersWin9x(Marshal.PtrToStringAnsi(vResource.RemoteName))
End Select
'Determine the Next Pointer
hPointer += Marshal.SizeOf(vResource)
Next i
End If
End If
bInitialized = True
Catch
'Call Globals.ErrorMessage("Refresh")
Finally
'Free Up Memory
Call Marshal.FreeCoTaskMem(ptrBuffer)
Call Marshal.FreeCoTaskMem(ptrDomain)
If (hEnum > 0) Then hResult = WNetCloseEnum(hEnum)
If (hBuffer > 0) Then hResult = GlobalFree(hBuffer)
End Try
End Sub
</Code>
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there is a Microsoft Spreadsheet 10.0 component in VB.NEt.
I dont know how to do data binding with it at run time (by code). plz help me to do that?
--thnx
waiting for a quick reply
Aakash
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If in VB6, right click on the Forms folder, select Add, then choose MDI Form. 
Nick Parker
May your glass be ever full.
May the roof over your head be always strong.
And may you be in heaven half an hour before the devil knows you’re dead. - Irish Blessing
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Wow, the Zen of MDI...
Pete
Insert Sig. Here!
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