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Hi. I'm trying to send an array of UDT from Excel VBA to a C++ dll but have no idea which direction I should look. Here's what I'm trying to do
MyTestDLL.cpp
#pragma pack(4)
struct MyCppType
{
short iVal;
double dVal;
BSTR bstr;
};
#pragma pack()
void _stdcall MyDllFunction (array of MyCppType)
{
}
MyTestDLL.def
LIBRARY "MyTestDll"
EXPORTS
MyDllFunction @1
MyTestExcel.xlsm
Option Explicit
Declare Sub MyDllFunction Lib "MyTestDLL.dll" (arr() As MyVbaType)
Type MyVbaType
iVal As Integer
dVal As Double
sVal As String
End Type
Sub Test()
Dim arr(2) As MyVbaType
arr(1).iVal = 1
arr(1).dVal = 1.1
arr(1).sVal = "one"
arr(2).iVal = 2
arr(2).dVal = 2.2
arr(2).sVal = "two"
MyDllFunction (arr)
End Sub
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You'd be better off asking this in the Visual C++ forum. It looks like you don't have the declaration in your C++ code correct. But, it's been about 8 years since I done something like this, so I'm not an expert in it.
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Is it possible to do something like this with VBA? None of the sample code I saw tried to pass an array of UDT with variable length string to a C++ dll 
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Sure. But, like I said, from what I remember, your problem isn't on the VBA side, it's on the C++ side.
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In my windows application project, with the help of openfiledialog control i choose a other exe file like word.exe, notepad.exe... then how can i get the (dll) reference file and location information for that selected exe file.
For example:
when we add an exe file in a setup project then it will automatically insert all the reference/dependencies file with in it. Like that i need to get all the file and location information.
Thanks in advance
KV
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Not sure, but I am going to guess that you will need to use reflection, although I think this will only work with .NET assemblies.
Steve Jowett
-------------------------
Real programmers don't comment their code. If it was hard to write, it should be hard to read.
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It's not listed in a file anywhere. You have to parse the .EXE and examine metadata, export and import tables. It would help greatly if you understood the PE file format. Without that knowledge, you'll find this project impossible.
Google results for PE file format[^].
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Hello All
This is my first time posting so please tell me if it is in the wrong place!
I have visual basic 2008, I made a classroom role with everyone's names in textboxes,
next to the names are 2 checkboxes on each name for here and not here. At the bottom i have
a save button. I would like it so when i click save it saves all the names in the textboxes and
which checkbox is checked to either a text file or excel sheet.
I am not very good with programming but i do know a coupple of things. I would love for anyone
to help me out in putting the code behind the save button.
Code for save button so far:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
End Sub
Thanks Chris 
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Hello Paul
Yes i did look into it but didn't like it. I have setup everything so all I want is when you click the save button it sends it to a text file or even saves the open program in a picture!
Thanks Chris 
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I am working on a project where I detect HID USB devices, in particular a barcode scanner. I have successfully gotten code the monitors WNDPROC and returns me a value when a particular HID device registers a keypress. I have tried with no success to "handle" events in WNDPROC, but they still make it to the form. The following are a few snippets to show what I have tried
Protected Overloads Overrides Sub WndProc(ByRef message As Message)
If id IsNot Nothing Then
if id.ProcessMessage(message)
End If
If id.Ignore = True Then 'This Is Set To True Only When A Known HID Device Registers A Key Pressed
message.Result = New IntPtr(0)
End If
MyBase.WndProc(message)
End Sub
The following code does work for all controls when I set the KeyPreview on the Form To True
Public Class frmMain
Private Ignore as Boolean = false
Protected Overloads Overrides Sub WndProc(ByRef message As Message)
If id IsNot Nothing Then
if id.ProcessMessage(message)
End If
Ignore = id.ignore
MyBase.WndProc(message)
End Sub
Private Sub frmMain_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
If Ignore = True Then e.Handled = True
End Sub
end Class
This Method might be the only way, but to me since it occurs in WndProc first, then I should be able to cancel the message at that point rather than wait further down the line. Any help would be greatly appreciated
Ryan
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Ryan Fleming wrote: I am working on a project where I detect HID USB devices, in particular a barcode scanner. I have successfully gotten code the monitors WNDPROC and returns me a value when a particular HID device registers a keypress. I have tried with no success to "handle" events in WNDPROC, but they still make it to the form.
Why?? Wouldn't it just be much easier to add a prefix sequence to the scanned barcode that you can look for in the KeyDown event and either eat or pass the keystrokes appropriately. At least, that's what I was doing about 3 years ago when I did this. If the keypress, and it's successors didn't match the barcode prefix sequence, the keys were passed up the chain. They did match, they got "handled" and the form didn't know anything happened. When the post-fix sequence showed up, I simply assigned the actual barcode to the TextBox that needed to show it.
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I am using multiple HID devices. One a card reader, one a barcode scanner. Multiple textboxes as well. When someone uses the card reader or the barcode scanner I need to know it is different then the keyboard, trap the text and process it appropriately. So unfortunately I can't just monitor text in a single testbox. Otherwise yes it would be easier, and I still use a unique start and end marker for the different HID devices to identify I got a complete message.
So, if anyone knows if I can handle messages in wndProc, like I am doing in the keypress, or has a different solution I am all ears!
Thanks
Ryan
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Ryan Fleming wrote: So unfortunately I can't just monitor text in a single testbox
I didn'y say I monitored test in a textbox. If you turn the Form's KeyPreview property on, you can use the Form's KeyDown event to monitor all keystrokes comming in before they go to any of the forms controls.
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Sorry I read a little more into your answer than you gave, but basically I believe what you suggested is the way I am doing right now. However, unless you know of a way I can identify the actual HID Device sending the text to a keypress, keyup, or keydown event, then I have to use the USB HID class which identifies devices by a handle and unique device name. The HID class determines the device by monitoring a windows forms message which I only now how to get from the wndProc function. If I see that the message in wndProc is from a particular USB device, I set the keyeventargs.handle in the form's keypress event to true, which prevents the text from reaching any controls. Thus my original question is that instead of handling the events in the windows forms keypress, I would like to handle the code in the wndProc. I have posted more complete code below, I always hesitate to post too much because it can confuse the actual question. I added some comments in the code trying to explain what it going on, they are preceded by ***. By the way, I don't want to come across as ranting, I do appreciate your feedback! I'd be happy to post all the code if I am still not getting my question across completely. Lastly I by using the class, I know that no other keypress by another HID device (However unlikely) will not get mixed up in the middle of a transmission. (The card reader takes almost 5 seconds to read all the magnetic strip on a card, plenty of time for a stray keystroke from a keyboard)
Public Class frmMain
Private id As InputDevice '***This Is The Class That Handles USB HID Devices
Private NumberOfKeyboards As Int32
Private HandleText As Boolean = False
Public Overloads Sub Show()
' Create a new InputDevice object, get the number of
' keyboards, and register the method which will handle the
' InputDevice KeyPressed event
id = New InputDevice(handle)
Dim DevicesFound As InputDevice.DeviceInfo() = id.EnumerateDevices()
cmbDevices.Items.Clear()
If DevicesFound Is Nothing Then
cmbDevices.Items.Add("No HID Devices Found!!!")
NumberOfKeyboards = 0
Else
cmbDevices.Items.Add("Handle No Devices")
cmbDevices.Items.AddRange(DevicesFound)
NumberOfKeyboards = DevicesFound.Length
End If
cmbDevices.SelectedIndex = 0
AddHandler id.KeyPressed, AddressOf m_KeyPressed '***Create an Event Handle for the Classes KeyPressed Event
Me.Visible = True
End Sub
' The WndProc is overridden to allow InputDevice to intercept
' messages to the window and thus catch WM_INPUT messages
Protected Overloads Overrides Sub WndProc(ByRef message As Message)
If id IsNot Nothing Then
id.ProcessMessage(message) '***This allows the USB Class To determin if the Message Is From A USB HID Device
'***If it is the m_KeyPressed event is raised
End If
MyBase.WndProc(message)
End Sub
Private Sub m_KeyPressed(ByVal sender As Object, ByVal e As InputDevice.KeyControlEventArgs)
lbHandle.Text = e.Keyboard.deviceHandle.ToString()
lbType.Text = e.Keyboard.deviceType
'**************************************************************************
'Labels Have Trouble Displaying A Single Ampersand So Replace One With two
lbName.Text = e.Keyboard.deviceName.Replace("&", "&&")
'**************************************************************************
lbDescription.Text = e.Keyboard.Name
lbKey.Text = e.Keyboard.key.ToString()
lbNumKeyboards.Text = NumberOfKeyboards.ToString()
lbVKey.Text = e.Keyboard.vKey
If cmbDevices.Text = e.Keyboard.deviceName Then '***If This Device matches a Known Device ID Lets Handle it so it does not show up
'***text on any controls
txtReadOnly.AppendText(e.Keyboard.TextRecieved) '***This is how I would get my text from the USB device and process it
HandleText = True '***This to me is a bit klunky but this flag is the only way in which I
'***can signal the form to handle this text
'***In fact it is possible that if one where banging on the keyboard
'***and using a scanner or card reader, that some text could be blocked
'***from the keyboard as well, but for my application it is highly unlikely
End If
End Sub
'***This event gets fired after the m_KeyPressed event from the USB class via normal windows messaging.
'***If I could handle the message back at the wndProc, I would not need to set a boolean flag in
'***the m_keypressed event, so that I can monitor the boolean flag below and determine whether or
'***not I need to block the keypress from showing up. Instead I could stop it at the wndProc, and get
'***My text from the e.keyboard.textrecieved in the m_KeyPressed
Private Sub frmMain_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
'You Must Have The Forms KeyPreview protperty set to True for this to work!!!
'This will cause the form to intercept all messsages before individual controls
'on the form do.
If HandleText = True Then
HandleText = False
e.Handled = True
End If
End Sub
End Class
Thanks
Ryan
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Ryan Fleming wrote: id.ProcessMessage(message) '***This allows the USB Class To determin if the Message Is From A USB HID Device
'***If it is the m_KeyPressed event is raised
End If
OK, you need something that keeps track of the input from the individual devices and determines when it has a complete message and when to abandon an incomplete message. THis is where the prefix tags come into play. I'd probably create a class that takes a HID ID and listens for messages from only that HID.
You can call your id.ProcessMessage function, but what does it do?? There's no return information, so it has to raise some kind of message with an identifier and value denoting which device the keystroke value came from. Without that, you've got nothing.
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You can call your id.ProcessMessage function, but what does it do??
In the Form's Show method the following code:
AddHandler id.KeyPressed, AddressOf m_KeyPressed
The code above creates a link to the KeyPressed event of the id class.
When id.ProcessMessage is called, the message is processed and if it comes from a USB HID device a keypressed event is fired which is linked to the m_KeyPressed subroutine in the Form.
The code below shows the information that is passed back to me identifying the device. THIS EVENT GETS FIRED AFTER THE WNDPROC (WITH A USB HID MESSAGE) STARTS, BUT BEFORE THE WNDPROC EVENT IF FINISHED!!!! THIS EVENT ALSO GETS FIRED BEFORE THE FORM'S KEYPRESSED EVENT IS FIRED FOR THE SAME MESSAGE EVALUATED IN WNDPROC.
(I removed the other Information from previous posts and included only that in which I am currently using)
Private Sub m_KeyPressed(ByVal sender As Object, ByVal e As InputDevice.KeyControlEventArgs)
If SavedHIDDeviceName = e.Keyboard.deviceName Then
USBHIDDeviceText = e.Keyboard.TextRecieved)
ProcessHIDText(USBHIDDeviceText)
HandleText = True
End If
End Sub
Private Sub frmMain_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
If HandleText = True Then
HandleText = False
e.Handled = True
End If
End Sub
From Here I set the HandleText boolean variable to true if it is a recognized device, so when the keypressed event fires I handle the text. It seems cleaner to me to have the processmessage function return a value in wndProc that would signal me to cancel the message before it trickles down to the Form's KeyPressed event, but I can't seem to void the message before it gets returned in the MyBase.WndProc(message) inside the WndProc subroutine. Ideally I could return the text recieved and device information when I call id.Processmessage and void the message before it leaves in the MyBase.WndProc(message), but so far I have not figured out how to void the message like I used to be able to do in callback functions in the VB6 days.
Thanks
Ryan
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Ryan Fleming wrote: THIS EVENT GETS FIRED AFTER THE WNDPROC (WITH A USB HID MESSAGE) STARTS, BUT BEFORE THE WNDPROC EVENT IF FINISHED!!!! THIS EVENT ALSO GETS FIRED BEFORE THE FORM'S KEYPRESSED EVENT IS FIRED FOR THE SAME MESSAGE EVALUATED IN WNDPROC.
OK, so the ProcessMessage call would have to return a value that says if it fired an event or not. If so, then you don't pass the message to the base WndProc method.
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dim money as integer
money = 1000000
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prostitution.
Christian Graus
Driven to the arms of OSX by Vista.
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FTW!
Any suggestions, ideas, or 'constructive criticism' are always welcome.
"There's no such thing as a stupid question, only stupid people." - Mr. Garrison
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Volunteer to be a human medical test subject.
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