io

问题 I was reading File.AppendAllText method from msdn http://msdn.microsoft.com/en-us/library/ms143356.aspx I saw they have listed FileNotFoundException to possible exceptions list for the method but according to there description about method on the same page Opens a file, appends the specified string to the file, and then closes the file. If the file does not exist, this method creates a file, writes the specified string to the file, then closes the file. this part If the file does not exist,

问题 I was reading File.AppendAllText method from msdn http://msdn.microsoft.com/en-us/library/ms143356.aspx I saw they have listed FileNotFoundException to possible exceptions list for the method but according to there description about method on the same page Opens a file, appends the specified string to the file, and then closes the file. If the file does not exist, this method creates a file, writes the specified string to the file, then closes the file. this part If the file does not exist,

问题 I've an application where I'm writing around 25 png image files to disk every second. BufferedImage img = getBufferedImage(); // code below is very slow ~150ms. File file = new File(count++ + ".png"); BufferedOutputStream os = new BufferedOutputStream(new FileOutputStream(file)); ImageIO.write(img, "png", os); It usually takes 150ms per call, and achieving 25fps hence becomes impossible. Can I buffer IO so that I don't drop any frames? 回答1: PNG encoding takes a while and you can't improve it

问题 For my assignment, I'm required to use fread/fwrite. I wrote #include <stdio.h> #include <string.h> struct rec{ int account; char name[100]; double balance; }; int main() { struct rec rec1; int c; FILE *fptr; fptr = fopen("clients.txt", "r"); if (fptr == NULL) printf("File could not be opened, exiting program.\n"); else { printf("%-10s%-13s%s\n", "Account", "Name", "Balance"); while (!feof(fptr)) { //fscanf(fptr, "%d%s%lf", &rec.account, rec.name, &rec.balance); fread(&rec1, sizeof(rec1),1,

问题 package main import ( "bufio" "encoding/csv" "fmt" "io" "log" "os" ) func main() { data, err := os.Open("cc.csv") defer data.Close() if err != nil { log.Fatal(err) } s := bufio.NewScanner(data) for s.Scan() { fmt.Println(s.Text()) if err := s.Err(); err != nil { panic(err) } } // Is it a proper way? data.Seek(0, 0) r := csv.NewReader(data) for { if record, err := r.Read(); err == io.EOF { break } else if err != nil { log.Fatal(err) } else { fmt.Println(record) } } } I use two readers here to

问题 package main import ( "bufio" "encoding/csv" "fmt" "io" "log" "os" ) func main() { data, err := os.Open("cc.csv") defer data.Close() if err != nil { log.Fatal(err) } s := bufio.NewScanner(data) for s.Scan() { fmt.Println(s.Text()) if err := s.Err(); err != nil { panic(err) } } // Is it a proper way? data.Seek(0, 0) r := csv.NewReader(data) for { if record, err := r.Read(); err == io.EOF { break } else if err != nil { log.Fatal(err) } else { fmt.Println(record) } } } I use two readers here to

问题 package main import ( "bufio" "encoding/csv" "fmt" "io" "log" "os" ) func main() { data, err := os.Open("cc.csv") defer data.Close() if err != nil { log.Fatal(err) } s := bufio.NewScanner(data) for s.Scan() { fmt.Println(s.Text()) if err := s.Err(); err != nil { panic(err) } } // Is it a proper way? data.Seek(0, 0) r := csv.NewReader(data) for { if record, err := r.Read(); err == io.EOF { break } else if err != nil { log.Fatal(err) } else { fmt.Println(record) } } } I use two readers here to

问题 Right now each module is writing to stderr, thus I cannot turnoff output of an individual one. Does anyone know how I can associate a stream with stdout thus each module will write to independent stream so I can turn it off. For example: fprintf(newStdout, "hello"); newStdout is writing to the screen. I don't know how to associate newStdout with the screen. 回答1: If your aim is to just have newStdout behave like stdout some of the time and silence it some of the time, you can do something like

问题 Currently, I have the following code... file_name = content.split('=')[1].replace('"', '') #file, gotten previously fileName = "/" + self.feed + "/" + self.address + "/" + file_name #add folders output = open(file_name, 'wb') output.write(url.read()) output.close() My goal is to have python write the file (under file_name) to a file in the "address" folder in the "feed" folder in the current directory (IE, where the python script is saved) I've looked into the os module, but I don't want to

问题 I'm trying to read one line at a time, of arbitrary length, from stdin at the command line. I'm not sure if I'll be able to include GNU readline and would prefer to use a library function. The documentation I've read suggests that getline ought to work, but in my experiments it doesn't block. My sample program: #include <stdio.h> int main() { char *line = NULL; if (getline(&line, NULL, stdin) == -1) { printf("No line\n"); } else { printf("%s\n", line); } return 0; } produces No line , which