我在C语言编程方面经验有限，但由于软件限制，必须使用这种语言。我正在尝试为CFD软件编写用户自定义。
软件在计算过程中写入输出文件，我想监视变量“PERCENT FILLED”并在值稳定时终止模拟。我可以终止代码，我遇到的问题是使用C读取PERCENT FILLED的值，我可以很容易地在python或shell脚本中执行此操作，但我真的很难用C语言。
可能有一种更优雅的方式，我很乐意学习，但我不是一个经验丰富的程序员，所以我可能会迷失复杂的解决方案。
我试图通过将任务分解为更小的子任务来做到这一点。代码的效率并不重要，因为不必频繁运行此函数，并且要读取的文件不是很大。我相信有更快更优雅的方式来做到这一点！ 使用网络上的其他代码并修改它们我已经提出了以下内容。
我尝试执行以下子任务： A）去除包含“PERCENT FILLED”的所有行并将它们写入文件（PERCENT FILLED.txt） B）读取该文件中的行数，然后将最后3行读入单独的变量中。 C）然后我需要重新格式化这些变量。例如，将3个变量从“PERCENT FILLED = 6.72902E + 00”形式的字符串更改为值为6.72902的浮点值。
我已经完成了A），在B）中有错误，并且无法确定从哪里开始用C）。
B中的错误） - 当我运行代码时，它在while循环中正确地为line1，line2和line3分配值，但是一旦在while循环之外，所有值都会变为line1的值。这个我不明白。谁能帮助我理解和解决这个问题？
示例代码输出：
line3: PERCENT FILLED = 6.31275E+00
line2: PERCENT FILLED = 6.50146E+00
line1: PERCENT FILLED = 6.72902E+00
******************
out line1: PERCENT FILLED = 6.72902E+00
out line2: PERCENT FILLED = 6.72902E+00
out line3: PERCENT FILLED = 6.72902E+00
C部分） - 我不知道从哪里开始。看起来有足够的内联信息来使用atof（）将字符串转换为float。但是，我首先需要从字符串的开头删除PERCENT FILLED =然后转换工程数字格式（某些值为1.00E + 02，因此只需剥离最后4个字符 - E + 00 - 将无效）。这个我无法解决怎么做。任何帮助，将不胜感激。
示例输入文件（通过删除PERCENT FILLED值之间的行来简化）：
Step = 171 Iteration = 0 Time step = 0.014849 Time = 4.834002
Iter Variable Solver Loops Delta Solve CPU Form CPU
0 F EXPLC 4 1.0000000E+00 0.007999 0.000000
FRACTION SOLID = 0.000000e+00 %
PERCENT FILLED = 5.46882E+00
Step = 172 Iteration = 0 Time step = 0.029698 Time = 4.863700
Iter Variable Solver Loops Delta Solve CPU Form CPU
0 F EXPLC 11 1.0000000E+00 0.018997 0.000000
FRACTION SOLID = 0.000000e+00 %
PERCENT FILLED = 5.70902E+00
Step = 173 Iteration = 0 Time step = 0.029698 Time = 4.893398
Time step reduced by COURANT limit in free_surface, c_lim = 2.032750e-02
Iter Variable Solver Loops Delta Solve CPU Form CPU
0 F EXPLC 6 1.0000000E+00 0.010998 0.000000
FRACTION SOLID = 0.000000e+00 %
PERCENT FILLED = 5.89665E+00
Step = 174 Iteration = 0 Time step = 0.020328 Time = 4.904356
Iter Variable Solver Loops Delta Solve CPU Form CPU
0 F EXPLC 7 1.0000000E+00 0.011997 0.000000
FRACTION SOLID = 0.000000e+00 %
PERCENT FILLED = 6.08026E+00
Step = 175 Iteration = 0 Time step = 0.040655 Time = 4.945011
Time step reduced by COURANT limit in free_surface, c_lim = 2.547617e-02
Iter Variable Solver Loops Delta Solve CPU Form CPU
0 F EXPLC 9 1.0000000E+00 0.016998 0.000000
FRACTION SOLID = 0.000000e+00 %
PERCENT FILLED = 6.31275E+00
Step = 176 Iteration = 0 Time step = 0.025476 Time = 4.955307
Time step reduced by COURANT limit in free_surface, c_lim = 1.997734e-02
Iter Variable Solver Loops Delta Solve CPU Form CPU
0 F EXPLC 9 1.0000000E+00 0.016994 0.000000
FRACTION SOLID = 0.000000e+00 %
PERCENT FILLED = 6.50146E+00
Step = 177 Iteration = 0 Time step = 0.039955 Time = 4.989764
Time step reduced by COURANT limit in free_surface, c_lim = 2.547537e-02
Iter Variable Solver Loops Delta Solve CPU Form CPU
0 F EXPLC 13 1.0000000E+00 0.024994 0.000000
FRACTION SOLID = 0.000000e+00 %
PERCENT FILLED = 6.72902E+00
我目前的代码：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
char line[1000];
char *pch;
char c[] = "PERCENT FILLED =";
char buff[1000];
/* Create a list of PERCENT FILLED values and write to file - copy every line containing PERCENT FILLED from p.out file*/
FILE *fp = fopen("inputFILE.txt", "r");
FILE *op = fopen("PERCENT_FILLED.txt", "w");
if(fp == NULL || op == NULL)
{
fprintf(stderr, "Error opening file.");
exit(1);
}
else
{
while (fgets(line, sizeof(line), fp) != 0)
{
if((pch = strstr (line, c))!= 0)
fprintf(op, "%s", line);
}
}
fclose(fp);
fclose(op);
/* Get the total number of lines in the file PERCENT_FILLED.txt */
FILE* myfile = fopen("PERCENT_FILLED.txt", "r");
int ch, number_of_lines = 0;
int line_num = 0;
int count = 0;
char readline[256]; /* or other suitable maximum line size */
char* line1;
char* line2;
char* line3;
do
{
ch = fgetc(myfile);
if(ch == '\n')
number_of_lines++;
} while (ch != EOF);
// last line doesn't end with a new line!
// but there has to be a line at least before the last line
if(ch != '\n' && number_of_lines != 0)
number_of_lines++;
fclose(myfile);
/* Get the last 3 PERCENT_FILLED values from the PERCENT_FILLED.txt */
FILE* infile = fopen("PERCENT_FILLED.txt", "r");
if ( infile != NULL )
{
while (fgets(readline, sizeof line, infile) != NULL) /* read a line */
{
if (count == (number_of_lines-4))
{
line3 = readline;
count++;
printf("\nline3:%s", line3);
}
else if (count == (number_of_lines-3))
{
line2 = readline;
count++;
printf("line2:%s", line2);
}
else if (count == (number_of_lines-2))
{
line1 = readline;
count++;
printf("line1:%s", line1);
}
else
{
count++;
printf("readline:%s count:%d\n", readline, count);
}
}
fclose(infile);
}
printf("******************\n");
printf("out line1:%s", line1);
printf("out line2:%s", line2);
printf("out line3:%s\n\n", line3);
/* strip "PERCENT FILLED = " from the string and turn the string into a float */
/* Do this for line1, line2, line3 */
/* Example string is " PERCENT FILLED = 6.72902E+00" need to turn this in to a float variable of value 6.72902 */
return 0;
}
答案 0 :(得分：1)
感谢您的帮助，我现在正在使用代码，如下所示。我确信有一种更优雅的方式可以做到这一点，但为了完整起见，我会提出我的最终代码，以防它可以帮助某人。
config.transpiler = 'typescript',
config.map = {
'app': 'app', // this is where your transpiled files live
'@angular': 'node_modules/@angular',
'rxjs': 'node_modules/rxjs',
'typescript': 'node_modules/typescript/lib/typescript.js'
};
config.packages = {
'app': { main: 'main.js', format: 'cjs', defaultExtension: 'js' },
'@angular/core': { main: 'index.js' },
'@angular/common': { main: 'index.js' },
'@angular/compiler': { main: 'index.js' },
'@angular/forms': { main: 'index.js' },
'@angular/http': { main: 'index.js' },
'@angular/platform-browser': { main: 'index.js' },
'@angular/platform-browser-dynamic': { main: 'index.js' },
'@angular/router': { main: 'index.js' },
'angular2-in-memory-web-api': { main: 'index.js', defaultExtension: 'js' },
'rxjs': { defaultExtension: 'js' },
};
config.bundles = {
'dist/index.js': ['app/*'],
'dist/dependencies.js': [
'@angular/core/index.js',
'@angular/common/index.js',
'@angular/compiler/index.js',
'@angular/platform-browser/index.js',
'@angular/platform-browser-dynamic/index.js',
'@angular/http/index.js',
'@angular/router/index.js',
'@angular/forms/index.js',
'angular2-in-memory-web-api/index.js',
'rxjs/*', 'rxjs/scheduler/*', 'rxjs/add/*', 'rxjs/add/operator/*', 'rxjs/observale/*', 'rxjs/add/observable/*',
]
}