There is probably not a significant performance gain in using a C/C++ dll. The C# runs in an environment with a quite efficient JIT compiler, so my guess is that the code performance is limited by a hard disk read speed of approximately 100 MB/s. Of course, if you have an SSD, your mileage may … Read more
The first issue is that the temp, temp2, and temp3 are int, but you are assigning double values to them, and then re-assigning these values back to double variables. You should make these double. You might want to consider using qsort() to sort these objects. #include <stdlib.h> // for qsort int compare_products(const void *p1, const … Read more
Keep track of the number of bytes you’re writing, and when it reaches a specified point, close the existing file and continue in a new one. There’s no need to analyze the size of the file, since you know exactly what’s going into it. Something like this: long fileSizeByteLimit = 5000000; long bytesOutput = 0; … Read more
The std::setw() I/O manipulator is the direct equivalent of printf()‘s minimum width for strings, and the std::left and std::right I/O manipulators are the direct equivalent for justification within the output width. But there is no direct equivilent of printf()‘s precision (max length) for strings, you have to truncate the string data manually. Try this: #include … Read more
The answer to your problem with writing to the file is every time you are writing to the file you are over writing what was there before, what you need to do is change FileOutputStream fos = openFileOutput(“TotalSavings”, Context.MODE_PRIVATE) to: FileOutputStream fos = openFileOutput(“TotalSavings”, Context.MODE_PRIVATE | Context.MODE_APPEND) This tells android you want to append to … Read more
Check the user permissions for the path & exe. Here’s how: Source solved access to the path is denied C# [closed]
Thank you all very much for your input. Actually the first thing i should have checked was at fault, being the HDD, which wasn’t able to provide the needed datarate. I’m now thinking about switching to a SSD – Device. solved Slowdown when reading big file randomly with C++
Obviously I can’t use your exact code, or you would not have asked the question, but this is a similar idea, done a bit differently, and also using the fgets which was causing you trouble. It works by searching each line for digits, and non-digits. Note that I have #define MAXLEN 2000 to be generous, … Read more
You can do this with file operations in c, i am just giving you hints, FILE *pFilePtr; // file pointer(handle of file) pFilePtr = fopen(argv[1],”r”); //define buffer to store data read line by line data char buf[32]={0}; //Now you can run a while loop to read entire file with fread() to get whole first line(until … Read more