UnlockFile | UnlockFile allows to unlock a file

I'm trying to implement simple file locking using renaming on windows 10. I've got the following test program that renames a file to lock it, then opens and reads it, and renames it to unlock it. However, I'm seeing intermittent errors when I run two of these simultaneously using different arguments (e.g. test.py 1, test.py 2)

I want to have 2 processes write in the same file. I created a file in the first process (parent) and call the second process (child) . I have made the file inheritable and the second process inherits the handle as a command line argument.

Although the handle is not equal to INVALID_HANDLE_VALUE, the second process can't do anything with the file. WriteFile() ends with Error 6(the handle is invalid). The same is for LockFile(),Unlockfile().

What is wrong with the code and how can I fix it? I want to make 2 processes work with the same file.

Process 1:

I'm trying to append one text file to another using VBA7 in excel 2010 32 bit, on windows 7 64 bit for prototyping purposes. Once this works, I'm going to be using the same method to append wav data from many files together and modifying the header information to be correct for the size of the appended wav data.

The problem that I'm having is when I call WriteFile (synchronously), it takes a long time to complete, and the reason is that it is writing 4 gigs to the text file, it should only be writing 20 bytes (the size of one.txt). What is going wrong or how can I debug it?

I have limited tools available to me on this machine, because it is a managed by a large organization. I only have access to VBA for programming environment. Powershell and normal command shell utilities are available.

I have done the following research: Read the msdn articles for all dll calls, set breakpoints to verify values are correct, read about 32bit vs 64bit compatibility in office 2010, read and understand (mostly) an msdn article on passing information to dll procedures in VB, found this great page about varptr and calling dll functions in VB, and got the code from an msdn C++ example, among much learning.

I am still new and learning C# as I go. My question is generic, so let me know if I can be more specific in any way. I am moreover looking for guidance/examples to go off of or even a simple solution to build from.

I have a class library that is currently working, but I want to display a window to the user. My class is for a program called Solidworks PDM and is a menu command. In the middle, I need the user to review and select "OK" or "Cancel".

Basically, how do I get a window that contains two buttons "OK" and "Cancel" in the my class library? Thanks in advance!

I am working on a stand-alone WinForm program in C# that uses the Solidworks EPDM api. The program takes a top level assembly and finds all the referenced and referencing files in the assembly. e.g. all sub-assemblies, part files, and drawings. The program then checks out all the files from EPDM, updates the data cards, and checks in all the files back to the EPDM.

I have successfully implemented the portion of the code that finds all the referenced and referencing files and updates the data card information using a background worker. This portion of the code does not require access the the UI thread. I would like to be able to add the code that checks out the files and checks them back in within a background worker. The problem is that the methods used to do the checkout and check-in take this.Handle as an argument. I know that accessing the UI thread from within a background worker will throw a cross thread exception. The code does not access any of the UI controls. It only need access to this.Handle. Is it possible to pass this.Handle to a background worker in a thread safe way that will not throw a cross thread exception?

This is my first use of background workers so my knowledge is limited. Below is the code that I would like to run in a background worker.