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The functions such as socket[^] are the old style socketAPI group, based on BSD sockets from the early days of UNIX. The WSAxxx functions are the later Microsoft adaptation.
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Is there a difference in speed?
Edit: My email shows another response that says
Quote: The main difference is that socket is a function in the C runtime, and WSASocket is a Windows API.
That response does not show up when I log in here. So can I presume that the WSAxxx versions are faster since they bypass the C runtime, which are, presumably, wrappers that then call the API internally?
Thank you for your time
If you work with telemetry, please check this bulletin board: www.irigbb.com
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bkelly13 wrote: can I presume that the WSAxxx versions are faster since they bypass the C runtime
No, you cannot presume anything. It is quite possible (but I don't know) that WSA is built on top of sockets rather than being a complete re-implementation.
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That response was from me. I deleted it because it was wrong. The socket function is not in the C runtime. I'm sorry to have misled you.
The difficult we do right away...
...the impossible takes slightly longer.
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Hi bkelly13 !
The "WSASocket API" are Microsoft-specific new functions for handling sockets in Windows.
If your code is to run on Windows machines only go with this new API since it provides more flexibility and some functionality benefits when working with types of sockets other than blocking.
Here are some qoutes from the Remarks paragraph in the MSDN regarding WSARecv:
Quote: The WSARecv function provides some additional features compared with the standard recv function in three important areas:
•It can be used in conjunction with overlapped sockets to perform overlapped recv operations.
•It allows multiple receive buffers to be specified making it applicable to the scatter/gather type of I/O.
•The lpFlags parameter is used both on input and returned on output, allowing applications to sense the output state of the MSG_PARTIAL flag bit. However, the MSG_PARTIAL flag bit is not supported by all protocols.
Same goes for WSASend:
Quote: The WSASend function provides functionality over and above the standard send function in two important areas:
•It can be used in conjunction with overlapped sockets to perform overlapped send operations.
•It allows multiple send buffers to be specified making it applicable to the scatter/gather type of I/O.
You can also find code examples for working with these API in there.
I have created and worked with sockets using this API (Blocking mode and event-based Overlapped mode) and overall it seems to work fine. If relevant, I can send you the code.
 Bye,
Amit C.
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I understand and am going with the WSA series. I am putting significant effort into this project. If you have code you don't mind sending, I will look at it. I am declaring my code as open source and will post it. Please send to user name "online" with that symbol followed by my domain bkelly then further followed by dot "ws", yes, its just that simple.
Thank you for the time you spent on your reply.
Thank you for your time
If you work with telemetry, please check this bulletin board: www.irigbb.com
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I am drawing (ownerdraw) a button. I used
if ( (state & ODS_SELECTED) || (state & ODS_FOCUS ))
{
}
to check selected state. Problem is this....If I call BN_CLICKED from parent window then control does not come into above condition but if I click button its working fine.
Please suggest how to set state to ODS_SELECTED?
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The BN_CLICKED message is send to the parent window of a button when it is clicked. It is send by the button control, not to it.
If you want to simulate a button click, send the BM_CLICK[^] message to the button control.
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It is fine but it does not solve my issue. I am calling as you said but still contols dont go into that condition.
I also tried to set SetFocus() function but no luck!!!
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I have just tested it with an owner draw button in one of my applications. When BM_CLICK is send and the button did not had the focus, the DrawItem() member function is called with the ODS_FOCUS state bit set. The same applies when calling the SetFocus() member function of the button.
So it seems that there is another error in your code. You may set a break point in your DrawItem() function and/or write the state to the debug window using trace() to check when and with which states your drawing function is called.
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Hello. I have been, somehow  , able to capture video from my USB camera using media foundation api. But the problem is that for a duration of about 10 seconds, the video size is 70-72 mb. I don't have to tell you that, that is a lot of video size for this duration.
I have tried lowering Frame Rate and AVG BitRate of the video stream but in vain. What should I change to get this size to minimum? Thanks for any pointers.
This world is going to explode due to international politics, SOON.
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It is little hard to tell you exactly what your best course of action is, because you have left out some key information, such as image resolution, video format and frame rate.
However, your numbers are typical if you are storing uncompressed video with the following settings:
Resolution: 352x288
Video format: AVI, Raw video (RGB or YUV) at 24 bits per pixel
Frame rate: 25 FPS.
[Resolution and Frame rate based on PAL being the TV standard used in Pakistan]
If the above values seem correct to you, you need to compress the video in order to make the video size smaller. There are obviously many video formats, such as MJPEG, MPEG2, MPEG4, H.264 and so on. You would need to determine the best fit for your project.
Your USB camera might be able to deliver compressed video in different formats, but if it does not, you will have to do the compression on your computer as the raw video frames are being received from the camera.
If I am dead wrong and you are actually storing high resolution images, then we need to come at this from another angle.
Soren Madsen
"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty
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Camera is giving me the video with following attributes.
Resolution = 640 x 480;
Frame Rate = 30 fps;
Color Scheme = RGB32
Encoding Format = WMV;
Since I am storing video data as .wmv, does't it mean that video being stored is compressed (or encoded) ?
This world is going to explode due to international politics, SOON.
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AmbiguousName wrote: Since I am storing video data as .wmv, does't it mean that video being stored is compressed (or encoded) ?
Yes, your video is compressed, but not by much. If you do the calculation to see how large a 10 second uncompressed video file would be using your values, you get something like this:
640 * 480 * (32/8) * 30 * 10 = 368,640,000 = 352 MB
This shows that the raw video is about 5 times larger than your compressed video. That is not an impressive compression ratio at all, so you should consider switching to H.264 as suggested by SuperCoder2014.
Soren Madsen
"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty
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Hey,
I need a C code which builds the printer job queue. However, the printer job queue is built as a two level priority queue.
modified 22-May-14 3:55am.
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Looks like a single linked list.
Here is a program for a single link list - Singly linked list[^]
You will need to modify the program slightly to cater to your requirement.
The given program only uses an integer variable.
Instead, you will need to make 2 checks on the userType and the pages.
«_Superman_»
I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++) (October 2009 - September 2013) Polymorphism in C
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Its probably because of an incorrect condition check.
Please post the code with the page check that you put in.
«_Superman_»
I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++) (October 2009 - September 2013) Polymorphism in C
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Logic looks OK.
I guess you need to single step through the code using the debugger and find out the issue.
«_Superman_»
I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++) (October 2009 - September 2013) Polymorphism in C
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I tried but didn't find the problem. Do you have an idea?
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Finded it, thanks for your help!
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I want to use C++ to call javascript and get the return value , but i don't how to use C++ to call js,and i don't how to give those parameters to the javascript function.
What should i do?
thanks for everybody's help!!
modified 22-May-14 8:54am.
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jingjing yuan wrote: how to use c + + for the Jason data
You need to explain where this data comes from and exactly what you expect your C++ program to do with it.
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