Question

我有

printf("%12.8f, %12.8f, %6.3f, %04u/%02u/%02u   %i:%i:4.2f\n",sbet.longitude1,sbet.latitude1,sbet.altitude ,myyear,mymonth, myday, sbet.hour, sbet.minute, sbet.second);

在If语句中。它产生了我想要的一行一行。但现在我想在顶部添加标题/标题。我使用另一个printf语句吗？当我尝试一个简单的

printf("Longitude,", "Latitude," "Elevation," , "UTC Time");

没有给我我想要的东西，它只是在每一行上放了“经度”，以及其他printf语句中的其余参数。

基本上我希望将此作为结果

Longitude,   Latitude,   Elevation,   UTC Time
-50.62596165,  67.01225899, 82.948, 2012/05/08   10:0:0.04
-50.62596152,  67.01225906, 82.949, 2012/05/08   10:0:1.04
-50.62596154,  67.01225906, 82.950, 2012/05/08   10:0:2.04
-50.62596148,  67.01225902, 82.951, 2012/05/08   10:0:3.04
-50.62596154,  67.01225907, 82.952, 2012/05/08   10:0:4.04
-50.62596160,  67.01225911, 82.952, 2012/05/08   10:0:5.04

这是完整的程序（如下）。它包含几个if语句。我试过把

printf( "Longitude, Latitude, Elevation , UTC Time\n");

在两个if语句之前，但我得到了相同的结果，每行上有四个单词标题而不是顶部的一行。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "applanix_data.h"
#include "applanix_pos_out.h"

#define DEGREES2RADIANS  (3.141592654 / 180.0)

int output_group_1(FILE *fp,
               FILE *fpout,
               unsigned short myyear,
               unsigned short mymonth,
               unsigned short myday,
               double time_sod,
               double double_time_met)
{
struct applanix_data_group1 data1;
struct pospacsbet sbet;

  if(fread(&data1,sizeof(struct applanix_data_group1),1,fp)==1)
 {
    sbet.gpstime = time_sod;
    sbet.latitude = data1.latitude * DEGREES2RADIANS;
    sbet.longitude = data1.longitude * DEGREES2RADIANS;
    sbet.altitude = data1.altitude;
    sbet.x_velocity = data1.eVelocity;
    sbet.y_velocity = data1.nVelocity;
    sbet.z_velocity = data1.dVelocity;
    sbet.roll = data1.aircraftRoll * DEGREES2RADIANS;
    sbet.pitch = data1.aircraftPitch * DEGREES2RADIANS;
    sbet.platform_heading = data1.aircraftHeading * DEGREES2RADIANS;
    sbet.wander_angle = data1.aircraftWanderAngle * DEGREES2RADIANS;
    sbet.x_body_acceleration = data1.aircraftTransverseAcceleration;
    sbet.y_body_acceleration = data1.aircraftLongitudinalAcceleration;
    sbet.z_body_acceleration = data1.aircraftDownAcceleration;
    sbet.x_body_angular_rate = data1.aircraftAngularRateAboutDownAxis;
    sbet.y_body_angular_rate = data1.aircraftLongitudinalAcceleration;
    sbet.z_body_angular_rate = data1.aircraftAngularRateAboutDownAxis;

    if(fwrite(&sbet,sizeof(struct pospacsbet),1,fpout)!=1)
      {
         fprintf(stderr,"Error writing POSPAC SBET output!\n");
         exit(-2);
      }

    sbet.latitude1 = sbet.latitude * (180/3.141592654);
    sbet.longitude1 = sbet.longitude * (180/3.14592654);
    sbet.day = sbet.gpstime/86400;
    sbet.time = sbet.gpstime/86400;
    sbet.hour1 = (sbet.time - sbet.day);
    sbet.hour = sbet.hour1*24;
    sbet.time = sbet.hour1*24;
    sbet.minute1 = (sbet.time - sbet.hour);
    sbet.minute = sbet.minute1*60;
    sbet.time = sbet.minute1 * 60;
    sbet.second1 = (sbet.time - sbet.minute);
    sbet.second = sbet.second1*60;

    printf("%12.8f, %12.8f, %6.3f, %04u/%02u/%02u   %i:%i:%4.2f\n",sbet.longitude1,sbet.latitude1,sbet.altitude,myyear,mymonth, myday, sbet.hour, sbet.minute, sbet.second);
    return 0;
 }
  else
 return -1;
}

我像这样调用函数

UNIX＆GT; gcc -o applanixraw2out applanixraw2out.c

UNIX＆GT; ./applanixraw2out applanix_raw_20120508.bin＆gt;的test.txt

Answer 1

printf("Longitude,   Latitude,   Elevation,   UTC Time\n");

Answer 2

printf("Longitude, Latitude Elevation, UTC Time"\n);

Answer 3

在if(fread ...之前，请使用格式化标题

printf("%-12s, %-12s, %-6s, %-12s\n", "Longitude", "Latitude", "Elevation", "UTC Time");

然后，您可以随时调整间距以匹配大部分

printf("%12.8f, %12.8f, %6.3f ...

Answer 4

看看我的简单库libTprint：https://github.com/wizzard/libtprint，它完全符合您的要求。看看代码 - 它非常简单，你应该能够理解它是如何工作的。

希望它有所帮助！

printf，为输出文件添加标题

4 个答案: