This is my question, i want to open a.jpg file and write each byte as a decimal number (0-255) separated with a comma, into another.txt file. Now it should be able. I am trying to read a file parsed from a command line argument 16 bytes at a time. I am storing the bytes in an unsigned char array. I am then trying to print the. I am trying to read a file parsed from a command line argument 16 bytes at a time. I am storing the bytes in an unsigned char array. I am then trying to print the. C++ file input and output are typically achieved by using an object of one of the following. Which is the index of the next byte that will be read from the file.
Str_buf has a maximum size of 1 ( char str_buf[1];), it should at least 5 bytes long (4 for XxXX plus the 0). Moreover, change sprintf(str_buf,'0x%x',raw_buf); to sprintf(str_buf,'0x%x',*raw_buf); otherwise you'll print the address of the raw_buf pointer, instead of its value (that you obtain by dereferencing the pointer). Reinforced Soil Engineering Advances In Research And Practice Pdf there. Finally, make sure both raw_buf is unsigned. The standard specified that the signness of chars (where not explicitly specified) is implementation defined, ie, every implementation decides whether they should be signed or not. In practice, on most implementations they are signed by default unless you're compiling with a particular flag. When dealing with bytes always make sure they are unsigned; otherwise you'll get surprising results should you want to convert them to integers.
.NET provides a lot of great tools for reading and writing files, lots of stream classes. If you're like me, I kind of find dealing with streams a pain.
If I want to read a file I should only have to say 'ReadFile' and the content should be there the way I want. As a result, I tend to write lots of helper methods that hide the stream manipulations so I don't have to remember them. Here's one that will read any file as an array of bytes. I've found this useful with both binary and text files when I didn't have to analyze the data inside--such as a simple file transfer.
