我正在“尝试”使用 C 存储 P3 PPM 文件,但我对此缺乏经验,所以我遇到了困难。我想知道是否有人可以帮助我完成我的任务。谢谢。
我想将它们保留为 struct PPM 和 struct PPM * getPPM(File * fd) 但内容可以更改。
我也不知道如何存储评论,但也想这样做。
基本上我尝试按如下方式存储数据:
P3
#comment.1
. . .
#comment.n
width height
max
r1 g1 b1
r2 g2 b2
r3 g3 b3
. . .
<小时/>
编辑:
我已经对其进行了更改以使其正确编译,现在我尝试传递 argv 以便文件可以读取 argv[1] 来获取文件名。当我这样做时,我收到了段错误。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//Holds the data
struct data {int r,g,b;};
struct PPM {char code[4]; char comments; int width; int height; int max; struct data *Data;};
//Gets the PPM data
struct PPM* GetPPM(FILE * fd, argv)
{
char readChars[256] = {0};
//Allocates memory for PPM
struct PPM *image = (struct PPM *)calloc(1, sizeof(struct PPM));
int i;
fgets(image->code, sizeof(image->code), fd);
fd = fopen(argv[1], "r");
//Checks if file is type P3
if((image->code[0] != 'P') && (image->code[0] != '3'))
{
return NULL;
}
image->code[2] = '\0';
//Checks for comments then continues around the loop until there's no more
fgets(readChars, sizeof(readChars), fd);
while(readChars[0] == '#')
{
fgets(readChars, sizeof(readChars), fd);
}
//Checks for PPM width, height and max
sscanf(readChars, "%d %d", &image->width, &image->height);
fgets(readChars, sizeof(readChars), fd);
sscanf(readChars, "%d", &image->max);
image->Data = (struct data*)malloc(image->width * image->height * sizeof(struct data));
i = 0;
while(fgets(readChars, sizeof(readChars), fd));
{
sscanf(readChars, "%d %d %d", &(image->Data[i].r), &(image->Data[i].g), &(image->Data[i].b));
++i;
}
fclose(fd);
return image;
}
//Deallocates memory
void freePPM(struct PPM *image)
{
free(image->Data);
free(image);
}
//Displays PPM
void showPPM(struct PPM *image)
{
int i = 0;
int totalpixels = image->width * image->height;
printf("%s\n", image->code);
printf("%d %d\n", image->width, image->height);
printf("%d\n", image->max);
for(i = 0; i < totalpixels; ++i)
{
printf("%d %d %d\n", image->Data[i].r, image->Data[i].g, image->Data[i].b);
}
}
int main(int argc, char ** argv)
{
struct PPM *image = GetPPM(argv);
showPPM(image);
freePPM(image);
return 0;
}
最佳答案
声明结构和读取数据的方式存在一些错误。检查以下代码中如何读取数据,如果您想更清楚,请返回此处。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct data {int r,g,b;};
struct PPM {char code[4]; char comments; int width; int height; int max; struct data *Data;};
struct PPM* GetPPM(FILE * fd)
{
char readChars[256] = {0};
struct PPM *image = (struct PPM *)calloc(1, sizeof(struct PPM));
int i;
fgets(image->code, sizeof(image->code), stdin);
if((image->code[0] != 'P') && (image->code[0] != '3'))
{
return NULL;
}
image->code[2] = '\0';
fgets(readChars, sizeof(readChars), stdin);
while(readChars[0] == '#')
{
fgets(readChars, sizeof(readChars), stdin);
}
sscanf(readChars, "%d %d", &image->width, &image->height);
fgets(readChars, sizeof(readChars), stdin);
sscanf(readChars, "%d", &image->max);
image->Data = (struct data*)malloc(image->width * image->height * sizeof(struct data));
i = 0;
while(fgets(readChars, sizeof(readChars), stdin))
{
sscanf(readChars, "%d %d %d", &(image->Data[i].r), &(image->Data[i].g), &(image->Data[i].b));
++i;
}
return image;
}
void FreePPM(struct PPM *image)
{
free(image->Data);
free(image);
}
void PrintPPM(struct PPM *image)
{
int i = 0;
int totalpixels = image->width * image->height;
printf("%s\n", image->code);
printf("%d %d\n", image->width, image->height);
printf("%d\n", image->max);
for(i = 0; i < totalpixels; ++i)
{
printf("%d %d %d\n", image->Data[i].r, image->Data[i].g, image->Data[i].b);
}
}
int main()
{
struct PPM *image = GetPPM(stdin);
PrintPPM(image);
FreePPM(image);
return 0;
}
关于c - 存储 PPM P3 文件的所有值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42569861/