Cody  Osinski

Cody Osinski

1619687443

How to Access Webcam Properties from C#

My Logitech C920 webcam requires some tweaking of settings like exposure, gain, focus, etc. to get good image quality. I uninstalled the “feature rich” Logitech software and now change the settings using the bare-bones Windows webcam properties dialog. This works well for me; unfortunately, the settings are not persisted reliably. After a cold-boot, or sometimes after simply starting an application that uses the webcam, I have to make the adjustments again.

That is why I became interested in what would it take to read and write the webcam properties and to open the properties dialog from C#. The result of a web search was a bit intimidating as I came across multimedia APIs that go way beyond what I intended to do. After all, I only wanted to access the properties, not write a full-blown video capture suite.

In the end I settled on DirectShow.Net, a C## wrapper around DirectShow under LPGL license. Even though DirectShow is an old API and the DirectShow.Net project seems to be no longer active, I found one very important reason to use it: A working sample that opened the webcam properties dialog.

This blog post starts with a guided tour through the sample, with the intended side-effect of making the sample easier to discover on the web. Additionally, I will describe how to access the properties from your code.

#english #.net #visual studio #video

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How to Access Webcam Properties from C#
Tamale  Moses

Tamale Moses

1624240146

How to Run C/C++ in Sublime Text?

C and C++ are the most powerful programming language in the world. Most of the super fast and complex libraries and algorithms are written in C or C++. Most powerful Kernel programs are also written in C. So, there is no way to skip it.

In programming competitions, most programmers prefer to write code in C or C++. Tourist is considered the worlds top programming contestant of all ages who write code in C++.

During programming competitions, programmers prefer to use a lightweight editor to focus on coding and algorithm designing. VimSublime Text, and Notepad++ are the most common editors for us. Apart from the competition, many software developers and professionals love to use Sublime Text just because of its flexibility.

I have discussed the steps we need to complete in this blog post before running a C/C++ code in Sublime Text. We will take the inputs from an input file and print outputs to an output file without using freopen file related functions in C/C++.

#cpp #c #c-programming #sublimetext #c++ #c/c++

Dicey Issues in C/C++

If you are familiar with C/C++then you must have come across some unusual things and if you haven’t, then you are about to. The below codes are checked twice before adding, so feel free to share this article with your friends. The following displays some of the issues:

  1. Using multiple variables in the print function
  2. Comparing Signed integer with unsigned integer
  3. Putting a semicolon at the end of the loop statement
  4. C preprocessor doesn’t need a semicolon
  5. Size of the string matters
  6. Macros and equations aren’t good friends
  7. Never compare Floating data type with double data type
  8. Arrays have a boundary
  9. Character constants are different from string literals
  10. Difference between single(=) and double(==) equal signs.

The below code generates no error since a print function can take any number of inputs but creates a mismatch with the variables. The print function is used to display characters, strings, integers, float, octal, and hexadecimal values onto the output screen. The format specifier is used to display the value of a variable.

  1. %d indicates Integer Format Specifier
  2. %f indicates Float Format Specifier
  3. %c indicates Character Format Specifier
  4. %s indicates String Format Specifier
  5. %u indicates Unsigned Integer Format Specifier
  6. %ld indicates Long Int Format Specifier

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A signed integer is a 32-bit datum that encodes an integer in the range [-2147483648 to 2147483647]. An unsigned integer is a 32-bit datum that encodes a non-negative integer in the range [0 to 4294967295]. The signed integer is represented in twos-complement notation. In the below code the signed integer will be converted to the maximum unsigned integer then compared with the unsigned integer.

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#problems-with-c #dicey-issues-in-c #c-programming #c++ #c #cplusplus

Shaylee  Lemke

Shaylee Lemke

1590218052

Learn how to access the command line parameters in C

In your C programs, you might have the need to accept parameters from the command line when the command launches.

For simple needs, all you need to do to do so is change the main() function signature from

int main(void)

to

int main (int argc, char *argv[])

argc is an integer number that contains the number of parameters that were provided in the command line.

argv is an array of strings.

#c #c# #c++ #programming-c

Ari  Bogisich

Ari Bogisich

1589816580

Using isdigit() in C/C++

In this article, we’ll take a look at using the isdigit() function in C/C++. This is a very simple way to check if any value is a digit or not. Let’s look at how to use this function, using some simple examples.

#c programming #c++ #c #c#

Ari  Bogisich

Ari Bogisich

1590587580

Loops in C++ | For, While, and Do While Loops in C++

In this Video We are going to see how to use Loops in C++. We will see How to use For, While, and Do While Loops in C++.
C++ is general purpose, compiled, object-oriented programming language and its concepts served as the basis for several other languages such as Java, Python, Ruby, Perl etc.

#c #c# #c++ #programming-c