因此,我正在讀取文件並使用系統調用將文件內容輸出到控制檯。另外我想爲輸出添加一個空間,每遇到20條線。這是我遇到麻煩,儘管下面的代碼幾行,正在顯示的整個文件不含空格系統調用:輸出文件並暫停每20行
//Write file contenst
while((nReadFile = read(nOpenFile, buffer, 1) != 0))
{
write(1, &nLineCount, sizeof(nLineCount));
if(nLineCount == 20)
{
write(1, "\n", 2);
nLineCount = 0;
}
if(nReadFile = write(1, buffer, nReadFile) == '\n')
{
nLineCount++;
}
}
這裏是整個程序(不包括含庫.h文件)
#include"mymore.h"
int main(int argCount, char *argv[])
{
struct termios initial_settings, new_settings;
tcgetattr(fileno(stdin), &initial_settings);
new_settings=initial_settings;
new_settings.c_lflag &= ~ICANON;
new_settings.c_lflag &= ~ECHO;
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VTIME] = 0;
if (tcsetattr(fileno(stdin), TCSANOW, &new_settings)!=0)
{
fprintf(stderr, "could not set attributes\n");
}
int nLineCount = 0;
int nCheckFile = 0;
int nFileCountCounter = 1; //first arguement interested in is argv[1]
int nOpenFile = 0;
int nReadFile = 0;
int nCount = 0;
char *cData;
char buffer[0];
//check that arguements have been provided
if(argCount < 2)
{
write(1, "There needs to be at least one file provided! \n", 50);
return 1;
}
do
{
printf("%d", argCount);
//check if file exists
nCheckFile = access(argv[nFileCountCounter], F_OK);
if(nCheckFile != 0) //if file does not exist
{
write(1, "The file ", 10);
write(1, argv[nFileCountCounter], strlen(argv[1]));
write(1," does not exist! \n", 25);
return 1;
}
else //file does exist
{
write(1, "Opening ", 10);
write(1, argv[nFileCountCounter], strlen(argv[1]));
write(1, "\n", 2);
}
//open the file
nOpenFile = open(argv[nFileCountCounter], O_RDONLY);
if(nOpenFile < 0)
{
write(1, "Failed to open file ", 10);
write(1, argv[nFileCountCounter], strlen(argv[nFileCountCounter]));
write(1, "\n", 2);
return 1;
}
//read file
cData = (char *) malloc(100 * sizeof(char));
cData[nReadFile] = '\0';//append null terminator
//find length of source file
while(cData[nCount] != 0)
{
nCount++;
}
//Write file contenst
while((nReadFile = read(nOpenFile, buffer, 1) != 0))
{
write(1, &nLineCount, sizeof(nLineCount));
if(nLineCount == 20)
{
write(1, "\n", 2);
nLineCount = 0;
}
if(nReadFile = write(1, buffer, nReadFile) == '\n')
{
nLineCount++;
}
}
cout << nLineCount << endl;
//close file
close(nOpenFile);
//Increment to next file
nFileCountCounter++;
}while(nFileCountCounter < argCount);//while there are still arguements
tcsetattr(fileno(stdin), TCSANOW, &initial_settings);
return 0;
}
這實際上是使用系統調用我的第一次的經驗,並有一兩件事我想我已經注意到的是,被之前的任何的C代碼執行的寫命令?
任何想法? 感謝
這不是C++。 –