檔案大小

-----

[知道檔名]

struct stat statbuf;

int filesize;

stat("copyfile1.txt", &statbuf);

filesize=statbuf.st_size; // bytes

printf("File size=%d bytes\n", filesize);

-----

[FILE *]

long filesize;

fseek(fp, 0L, SEEK_END); //移動到相對END的0L位置 filesize=ftell(fp); //傳回相對開始位置的bytes數 fseek(fp, 0L, SEEK_SET); //移動到絕對位置0L的位置

----

[ps]

fopen(); // If failed, return NULL

open(); // If failed, return -1

無緩衝IO

#include /* Standard input/output definitions */

#include /* String function definitions */

#include /* UNIX standard function definitions */

#include /* File control definitions */

#include /* Error number definitions */

#include /* POSIX terminal control definitions */

#include

#define ENTER 10 /*ASCII code of LF in linux*/

#define MAX 10

int main(void) {

//int fd;

//fd = open("/dev/ttyS0", O_RDWR|O_NOCTTY|O_NDELAY);

int fp, fp2;

char str[MAX],ch;// buffer

int bytes=0;

fp=open("copyfile1.txt", O_RDWR);

fp2=open("output.txt", O_RDWR | O_CREAT, S_IREAD | S_IWRITE);//

if( (fp==-1) || (fp2==-1) )

{

printf("file cannot be opened, fp=%d, fp2=%d\n", fp, fp2);

return 1;

} else {

while( (bytes=read(fp, str, MAX))>0){

write(fp2, str, bytes);//

}

}

close(fp2);//

close(fp);

printf("Copying finish...\n");

return 0;

}

RS 232

http://www.ubuntu-tw.org/modules/newbb/viewtopic.php?topic_id=31810&forum=12&post_id=149114

Android App basic structure 基本架構

[Application Name]

├--src/

│ └--com/demo/android/OOO //這串路徑為package name

│ └OOO.java // [create Activity Name] 重要程式碼

├--gen/

│ └--com/demo/android/OOO //這串路徑為package name

│ └R.java // 自動產生的類別 各樣資源的字典

├--res/

│ ├--layout/ //XML檔案

│ ├--values/ //XML檔案

│ ├--drawable/ //圖片檔

└--AndroidManifest.xml //用到的函式庫 Service Activity