I understand that in order to return a string from a function I have to return a pointer. What I don't understand is why a char array is treated somewhat different from, say, integer, and gets destroyed when you exit the function. That's probably because I come from a high-level languages world, but this seems to be equally valid to me: ...
Hi, I am trying to understand array declarations, constness, and their resulting variable types. The following is allowed (by my compiler): char s01[] = "abc" ; // typeof(s01) = char* const char s02[] = "abc" ; // typeof(s02) = const char* (== char const*) char const s03[] = "abc" ; // typeof(s03) = char const* (== const char...
I have just done what appears to be a common newbie mistake: First we read one of many tutorials that goes like this: #include <fstream> int main() { using namespace std; ifstream inf("file.txt"); // (...) } Secondly, we try to use something similar in our code, which goes something like this: #include <fstr...
Hi there I'm reading a string and breaking each word and sorting it into name email and phone number. with the string joe bloggs [email protected] 12345. But once i break everything down, the individual separated variables which hold the name,email and phone number have garbage characters at the end of them. I cant figure out why. test f...
So I want to have a buffer with an array of structs like this: EventItem { tag; // some string or array of characters to describe the value; value; // some integer or something } The value can be anything like int32. What I am concerned about is the tag. If I have an array of these objects, and I make the tag a string, what hap...
Hi all, i have gone through the numerous questions regarding signed/unsigned char. I understand there are three distinct char types in C++. Currently i have a large code-base which is compiled with Visual Studio - the "default char unsigned" setting is set to "No". Now i'm supposed to add a particular project to our code-base (integrate...
I'm writing a parsec parser which reads in strings and converts escaped characters, as part of exercise 3 here. For that exercise I am using this function: escapedCharFromChar :: Char -> Char escapedCharFromChar c = read $ concat ["'\\",[c],"'"] I am not to impressed with the use of read to convert the character x into the escape cha...
I have a C array called buf. Here is it's definition: char buf[1024]; Now, my current code takes from stdin and uses fgets() to set that array, however I wish to use code to set it instead. Right now the line that sets buf looks like this: fgets(buf, 1024, stdin); Basically, I want to replace stdin, with say... "My String". What's th...
How do I split a string by char 0 / byte 0 / 0x00 / \u0000 in flash actionscript 3 ...
Hello, I'm trying to define a path at compile time by passing: -DDCROOTDEF='"/path/to/stuff"' on the compile line. I then try to get use this in the code like: char * ptr_path; strcpy(ptr_path, DCROOTDEF); strcat(ptr_path,"/MainCommons/CommonLib/fonts/Arial.ttf"); char *pftf=ptr_path; gdImageStringFT(pimg,brect,iclr,pftf,pts,ang,i...
hello All, I was able to generate python bindings for a camera library using SWIG and I am able to capture and save image using the library's inbuilt functions. I am trying to obtain data from the camera into Python Image Library format, the library provides functions to return camera data as unsigned char* . Does anyone know how to c...
I am reading chapter 2 of Advanced Linux Programming: http://www.advancedlinuxprogramming.com/alp-folder/alp-ch02-writing-good-gnu-linux-software.pdf In the section 2.1.3 Using getopt_long, there is an example program that goes a bit like this: int main (int argc, char* argv[]) { int next_option; // ... do { next_option = g...
I have a String^1 and I need to convert it to const char* and c_str() does not work as it is not a member of System::String. Is there a simpler way to do this other than this method? I am only doing this once and it is from an openFileDialog->Filename, so the input will not be anything complex. I am using Visual Studio 2008. Thanks ...
I would like to compare a character literal with the first element of string, to check for comments in a file. Why use a char? I want to make this into a function, which accepts a character var for the comment. I don't want to allow a string because I want to limit it to a single character in length. With that in mind I assumed the e...
char * function decode time() { tm *ptm; //time structure static char timeString[STRLEN]; //hold string from asctime() ptm = gmtime( (const time_t *)<ime ); //fill in time structure with ltime if(ptm) { strncpy(timeString, asctime( ptm ), sizeof(timeString) ); //EDIT sprintf(test, "Sting is: %s", tim...
char out_file_name[30]; ogSize = strlen(FileName); //i.e. - FileName_anylength.log (always.log) ogSize -= strlen(IN_FILE_SUFFIX); //amount of chars before .log strncpy( out_file_name, FileName, ogSize ); //out_file_name now is FileName_anylength (without the .log) Is this the best way to do this? Also, how do I guard that ogS...
I have const char* FilePathName which looks like this: C:\ImportantFile.hex And an int id = 12345; I need to define a new const char* FilePathName_ID that would append the id with an underscore to the original FilePathName to look like this: C:\ImportantFile_12345.hex I have looked at this but its different as I am using const char* wh...
The code that is confusing me: set CLEAN=\Users\%USERNAME%\Documents\Directory One\Sub Directory\30% Dalton.txt IF EXIST %CLEAN% echo "It Works" This code will never work because the file name has a " % " char Is there a way to get around this and produce the Echo "It Works" ...
I am trying to find out filetypes using c code, here is the code char *get_file_type(char *path, char *filename) { FILE *fp; char command[100]; char file_details[100]; char *filetype; sprintf(command, "file -i %s%s", path, filename); fp = popen(command, "r"); if (fp == NULL) { printf("Failed to run c...
Is there a reason for this? I am asking this because if you needed to use lots of empty char, then you get into the same situation as you would when you use lots of empty strings. EDIT: Reason for this usage was this: myString.Replace ('c', '') So remove all instances of 'c's from myString. ...