COleDateTimeSpan dlElapsed = COleDateTime::GetCurrentTime()
#Simplefile downloader download#
In the while loop, we declare a COleDateTimeSpan object to calculate the seconds between the download start and the current time. This function will get the time the download started. COleDateTime dlStart = COleDateTime::GetCurrentTime() Before we go into the while loop, we create a COleDateTime object to get the current time and declare a variable (double) to store our seconds between the current time and the download start time.
![simplefile downloader simplefile downloader](https://windows-cdn.softpedia.com/screenshots/Simple-File-Encryptor_4.png)
int percent = currentbytes * 100 / x ( our file size integerĬalculating the download speed is a bit trickier. To calculate our bytes received, percentages, and download speed(kb/sec), use the following code. while(int bytesread = file->Read(charbuf,512)) The progress is updated every time the program performs another file->Read() function. Our program uses chunks of 512 bytes, not to overload the connection. The updating of the progress bar is being made every time we read a chunk of the file.
![simplefile downloader simplefile downloader](https://www.tutsmake.com/wp-content/uploads/2021/06/React-JS-Axios-File-Upload-Example-768x384.jpg)
![simplefile downloader simplefile downloader](https://i.ytimg.com/vi/cpL8vlpuO7k/maxresdefault.jpg)
The ::SeekToEnd() function returns the total bytes of the file, which is determined into a file size. The parameters passed to the function are lower value and upper value lower value is of course 0 and the upper value is the file size, which we determine by simply calling: int x = file->SeekToEnd() To make our progress bar effective, we use the CProgressCtrl::SetRange32() function. Reading from the file is quite easy all we have to do is this: file->Read(char buffer,int bytes to read) įl.Open("myfile",CFile::modeCreate | CFile::modeWrite Reading from the File and Writing It to the Local Hard Drive I haven’t tested writing into a file using this method but it probably will require the permission and access for the file write method on the specified server. You now can process the file as it was on your local hard drive. This function returns a pointer to a CStdioFile, which is currently the file we requested online.
#Simplefile downloader code#
Look inside the program source code to see the actual implementation of the code below: CInternetSession netSession įile = netSession.OpenURL(char url,1,INTERNET_FLAG_TRANSFER_BINARY
#Simplefile downloader how to#
Note: The following code is just a general overview of how to perform these tasks. All the downloading is being done from inside the thread along with the on-screen updating we will get into that in a minute. The program uses a worker thread to perform the file download this is so that our main application won’t be blocked and so that we could have a cancel download functionality inside the program. I hope that when you finish reading this article, you will be able to write such a thing yourself…so let’s get started! General Description Note: The methods I used are probably not the fastest and most efficient out there, but that is the way I code.
![simplefile downloader simplefile downloader](https://c2.staticflickr.com/2/1576/26172859262_f982d818d4_b.jpg)
The code is fully commented for easy understanding and I will cover every aspect of the program in this article in detail so that coders can understand and implement this code on any program they want. The pictures below are snapshots off the downloadable example in this article. The article also covers how to get file complete percentage, bytes received, bytes left, and download speed (kb/sec). In this example, I will demonstrate how to achieve this task. Many people have wondered how to download a file from the Internet while having a progress bar to track the download progress. Environment: Compiled and tested on VC++ 5.0 and 6.0 running Windows 2000/NT/XP