I am trying to call a fortran DLL from VB.NET. Fortran function requires two character strings to be passed from VB to fortran. I am able to run the code with a change after receiveing a AccessViolationException error. I dont understand why it worked can
some one whose professional explain me the difference. Here I am attaching the codes for reference
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I am running one fortran exe in .net application(calling from command line with the help of system diagnostic process). If we directly click on fortran exe, it shows inputs to enter for fortran in command window, after input entered it gets executed. We want same behaviour but want to run fortran exe from .net application, If we click on button in vb.net form, this exe should get called and should show inputs to enter on the command line, once inputs entered it should execute. How to achieve this with .net application? Right now, after clicking on button in vb.net form, exe get's opened in command window, but it is blank, and gets hanged. [code]
View 1 Replieshave problem with calling a Fortran DLL from VB.net Program. The VB program provide the GUI while the Fortran DLL does the calculations.The Fortran DLL opens and reads from data files supplied by the VB program. however, DLL program displays a message that says it can not open the file.
View 1 RepliesI have a subroutine that was written in fortran that I need to call from VB.NET where all of my other functions are written. I did not write the fortran, and hardly know fortran. I am getting the below exception on my dll function call and don't know how to fix it. I wonder if it is due to incongruent variable lengths? I have the source for my fortran and compiled it using the g95 compiler. I have tried compiling it with a flag on which is supposed to force all of the reals to 32 bits (-r4). It weirds me out that you don't seem to be required to initialize variables before use in fortran. I thought it was supposed to be a ridged language.
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I am calling a Fortran dll from vb.net. It works when I call it it one time only. When I put that in a loop, it works for the first time and second time it quits the program. How can I run this in a loop?
View 4 RepliesI was wondering if there was a way to write fortran or to integrate fortran to Visual Basic .net 2010..Maybe with adding a refferance or something? what options are available?
View 5 RepliesI am trying to run a fortran .exe in VB with the Shell() command. The fortran .exe, when ran, it asks you for a file name. It works perfectly on it's own, but when I try calling it through VB Shell(), it does not work.. (i.e. I cannot get VB to get the file name in it.)
Added info:I am using VB9 but I'm writing in compatibility to .NET. As for the Fortran .exe, when you call it, it opens a command window where it asks for a file name (which I got as a string in VB and I'm trying to pass it in), then you press Enter and it's done. Basically the .exe takes a text file and creates a new text file. We've also tried adding & mystring when calling the exe, but it gives a "file not found" error.
How fast can I replace characters in a string?
So the background on this question is this. We have a couple of applications that communicate with each other and with client's applications through sockets. These socket messages contain non printable characters (e.g. chr(0)) which need to get replaced with a predetermined string (e.g "{Nul}"} because the socket messages are kept in a log file. On a side note, not every log message will need to have characters replaced.
Now I started off on this little adventure reading from This MSDN link which I found from a different post from this site.
The current method we used...at the beginning of the day...was using string builder to check for all the possible replacements such as...
Public Function ReplaceSB(ByVal p_Message As String) As String
Dim sb As New System.Text.StringBuilder(p_Message)
sb.Replace(Chr(0), "{NUL}")
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This so far has been the fastest way I have found to process these messages. I have tried various other ways of going about this as well like converting the incoming string into a character array and comparing along with also trying to loop through the string rather than the chrArray.
So I have software to replace string with string, it's cool but I need code which would replace any given character (for example a) with all strings from textbox.
Here is example:
Character to change: a-> X
List of words which should not be touched: "car"
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I was wondering something. Is it possible to call a function in a Dll whose location is placed in a variable?What I mean is that I create a string that contains the file location odll file(Dim str as String = "DllFileLocation") Then, I call a function from that dll. And thenI change the string to a different file name (str = DifferentDllFileLocation") and then call a function from that dll. Is that possible?This would be good for my program whereuserswould import their own dll files, and then the program would call functions from those dll files.
View 4 RepliesI need to generate a lot of random 2 character strings for my application. it's a VB console application. basically what I have tried for random strings is this:
Private Function GenerateRandomString(ByVal intLenghtOfString As Integer) As String
'Create a new StrinBuilder that would hold the random string.
Dim randomString As New StringBuilder
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What is going on? I thought that I used to, a long time ago, be able to just do random.Next.
I had a strange error in a VB6 app this morning and it all stems from the fact that IsNumeric is not working as I expected. To me this seems like a bug.
This code displays 4.15877E+62 in a message box:
Dim strMessage As String
strMessage = "0415877D57"
If IsNumeric(strMessage) Then
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I am guessing that the runtime engine is incorrectly thinking that the D is in fact an E? I think this is a bug though as the exact same code in VB.NET outputs not numeric Is this a known issue with IsNumeric?
I have quite a bit of VB6 experience but now am trying to create my first VB.Net project. The project is very simple - it just needs to send 8-10 character strings from the PC serial port. The problem I'm seeing is that VB.Net is always sending out a 0x0A character after each 'WriteLine' call. Using VB6 it was necessary to manually send out any End Of Line characters. My application requires that no extra EOL characters be sent after the string.
View 2 RepliesI have inherited a database that is moving to the web. Problem is that some of the string fields have html characters....
One example is....
"" without the quotes, IT WON'T SHOW UP IN HERE EITHER, trying something else. At any rate it has < and the > signs with text in the middle.
How can I escape any possible combination of html references.
SelectCommand="usp_getSingleStringData" SelectCommandType="StoredProcedure"
<SelectParameters>
<asp:SessionParameter Name="shrtText" SessionField="shrtText" Type="String" />
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If I have two threads both calling a normal function at the same that appends strings, sometime the output string is a combination from both threads as the function had not finished executing the code before it was called again... Would a shared function wait to finish first?
View 9 RepliesSay I have a List(Of Tag) with Tag being an object. One member of Tag, Tag.Description, is a string, and I want to make a comma-separated concatenation of the Description members.Is there an easier way to do this than to read the Description members into a List(Of String) and then use the Join function?
View 2 RepliesI have several subroutines which are written in FORTRAN.
1) how I need to compile the FORTRAN subroutines?
2) what I need to do within VB 2005 to call these FORTRAN subroutines within the VB 2005 code?
I have a DLL written in fortran that I know works because I am getting it from a working software package that we use daily. I am trying to call it from anything but am having problems i believe with passing the correctly formatted arguments in and out of it, so i decided to try and access it from a VB program. I chose VB because I have contacted the developer of the software package we are using and he gave me his DLL function call in VB6, even though he is not allowed to show me the FORTRAN source.
Problem is (perhaps, i think) that I am writing in VB.NET, which has different data types than VB6. Can anyone see why i am am having problems. The error i get upon running is: "AccessViolationException was unhandled: Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
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I am running one fortran exe in .net application(calling from command line with the help of system diagnostic process).If we directly click on fortran exe, it shows inputs to enter for fortran in command window, after input entered it gets executed.We want same behaviour but want to run fortran exe from .net application,If we click on button in vb.net form, this exe should get called and should show inputs to enter on the command line, once inputs entered it should execute. How to achieve this with .net application?
Right now, after clicking on button in vb.net form, exe get's opened in command window, but it is blank, and gets hanged.Below is the error forrtl: error (200): program aborting due to window-CLOSE event Image PC Routine Line[code]....
I have 2 source codes in fortrran (I have not written them). I visualized these codes by linking them to VB2005.when I excuate the VB.exe, when VB calls one of these DLLs, there is no problem, but in calling the other DLL, the DLL is executed but the VB.exe is closed and the interface page to the user goes out.
View 1 RepliesI can pass integers, singles, doubles, and arrays of all these back and forth with no problem. But I can't figure out how to pass a string in Visual Basic 2010 to a character variable in the Fortran DLL. I keep getting the PInvokeStackImbalance error. I could just convert the Visual Basic string to an integer array containing the ASCII code for each character, send that, and convert back inside the DLL, but that's pathetic. There must be a simple way to do this.
I first tried using Dim txt(50) as Char in VB2010, and character*50 txt in the DVF F90 DLL but that didn't work.
Then I tried Dim txt as String in Visual Basic 2010 and made the string 50 characters long (also tried 49) but this didn't work.
I could pass a User Defined Type data structure to a Fortran DLL, that contained Short Integers, Singles (real variables) and a series of Fixed Arrays, both short integers and real variables.I am upgrading my VB6 app to Visual Studio 2008 - VB, and I want to keep the same data structures as they are used in about 300,000 lines of code.I modified the Data Structure as follows below, making sure it is of Explicit Layout, since I want the position of all variables to be the same both in VS 2008 and Fortran.Two problems arise:
1) if the LayoutKind is Explicit, such as in the example below (only part of the data structue is shown, where "..." indicate part of omitted data structure members), whenever I try to run my app, I get the following exception message, which indicates that the VBFixedArray declared at Offset 154 is in conflict with some other object, unnamed by the exception handler.
Message="Could not load type 'MyApp.SomeStruct' from assembly 'MyApp, Version=1.32.3906.33480, Culture=neutral, PublicKeyToken=null' because it contains an object field at offset 154 that is incorrectly aligned or overlapped by a non-object field."
Source="MyApp"
TypeName="MyApp.SomeStruct"
StackTrace:[code]....
2) if the LayoutKind is Sequential, the app will start, all the data preceding the VBFixedArrays is passed to the Fortran Dll without problem; everything that follows the VBFixedArray is garbled and unusable. To check this, I have made a Fortran subroutine in the Dll to which I pass both the Data Structure and a vector; in the Fortran subroutine, all the elements of the data structure are equivalenced to individual positions in the vector; upon return from the Fortran subroutine, I compare the elements of the data structure and those of the vector.
The problem here is that the Data Structure contains some 1300 names, and is used extensively in the application, as it is the way to pass elegantly a lot of data pertaining to a mathematical model with only one adress when accessing the Fortran Dll, in which the computing engine lies.
<StructLayout
<StructLayout(LayoutKind.Explicit, Size := 9226, CharSet := CharSet.Ansi)>
Public Structure SomeStruct[code]......
My challenge is to prepare for a presentation using a GUI interface to access a program written in Fortran.The Fortran program reads a data file and then writes an output file.For the presentation I need to be able to change a variable value in a VB form, update the data file, and run the Fortran program from the VB form.I also need to be able to create graphs using VB forms using the output file generated by the Fortran program.
View 2 RepliesI have LaPack numerical package , I want to compile with Visual Fortran (INTEL) using vs2008.I want to use the routines from a VB.NET program.How can I call the routines from VB ?
View 9 RepliesI have a button on a form that is supposed to run an executable (compiled Intel Fortran v11) on the click event. Here is the code:
Private Sub RunButton_Click() Handles RunButton.Click
Try
System.Diagnostics.Process.Start("C: estDir estCode.exe")
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I'm certain the path is correct and I have verified that running the testCode.exe from the cmd window works as it should (testCode.out file is updated). When I try to run the process via the RunButton it appears to work...no errors are reported or caught. However, the expected output file is not updated indicating testCode.exe did not execute. All of the online support I have researched indicates this should work.
I'm currently working on being able to import a DLL written in Fortran into Visual Basic. I've got all the basics down, so now I'm trying to take it a step further. The title basically says it all, but I'll explain what it is I'm trying to do anyways.
For kicks and giggles, let's just assume I want to pass an object that has three double values in it, possibly representing a point in space in three dimensions. In my Fortran method, I want to take that object, print out the x value, then change the x value to 7.5. Here's my Fortran code that does just that.[code]...
I really need help with this. I am trying to call a fortran DLL from VB.NET program. The program works fine untill it reaches the end of the DLL program where, instead of transferring the control back to the calling program the message " PinvokeStackImbalance error" is displayed and program halts. If I turn off pInvokeStackImbalance from the Debug menu, then the program will compile without problem. However, the .EXE program crash after the DLL call. Does anybody where the problem is. following the VB.Net program that calls the fortran DLL:
Private
Declare Sub
WIDTH_SUB Lib
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I have an old Fortran program that I've compiled to a windows executable. On opening this from an explorer window the executable runs fine, however on using Shell to run the program a traceback error occurs. Just to be sure I used Shell to open a batch file which runs cmd /K ...exe Why is it that on double-clicking the batch file it will run the executable correctly, however on calling it from my visual basic (very simple button) program the batch file opens the command prompt just fine but does not execute the whole Fortran code successfully? Incidentally I have found that the error occurs on a line to do with reading from a file; it can print to the command prompt etc. with no problems just not deal with the reading the external text file for some reason. By the way paths for files etc. are definitely correct. It makes no sense to me, but from a bit of research it may have something to do with correcting the read statements - at the moment they are just in the form: read(99,*)
View 1 RepliesFortran Samples for Visual Studio 2008 will not debug or run. I can't get the sample programs to run. I am a engineer not a programmer
View 2 RepliesHow do I write an expression to calculate all characters of each row by my own defined value to each character = all the A and B and C and etc. will be as 2 and all I and J and whatever ... will be 1 so I need an end result of the total.
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