P6
650 652
255
P6表示它是PPM图像 . 接下来的两个字段是图像的宽度和高度 . 最后一个字段给出最大像素值 . 在 Headers 的末尾是\ n,然后是二进制像素数据 . 图像是彩色的,因此有三个字节(红色,绿色,蓝色) . 我的readPPM函数的目标是返回无符号字符的一维数组中的像素数据,加上图像的宽度和高度 . 我的writePPM函数的目标(我还没有为该函数做任何事情)是将PPM格式图像从我的readPPM函数返回的给定信息写入空文件 . 我仍然不确定如何使这个程序工作,所以我不存储650宽度和652高度 . 一旦我能够实际读取和写入文本文件,我就会担心 .
Update: 我已经成功地将 Headers (P6,650,652和255)存储在他们的正确变量中(我知道因为我尝试打印他们的值并且它们出来了) . 我的输出如下所示 . 我想知道最大值以下的那些无意义的字符是什么 . 那些是二进制像素数据吗?如果是这样,那么我只需要编写我的writePPM函数 .
Output: PSix:P6
宽度:650
身高:652
最大值:255
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main.cc
int main() {
char fileName[50] = "binary_pixels.txt";
int width = 0; // width of the image
int height = 0; // heigt of the image
int size = 128; // size of the array
// read the PPM file and store its contents inside an array and return
// the pointer to that array to pixelArray
unsigned char* pixelArray[size] = readPPM(fileName, &width, &height);
// print the contents of the array
for (int i = 0; i < 128; i++) {
printf("%s\n", pixelArray[i]);
} // end of for loop
} // end of main
readPPM.cc
unsigned char readPPM(const char* fileName, char* pSix, int* width,
int* height, int* maximum) {
// open the file to read just the header reading
FILE* fr = fopen(fileName, "r");
// formatted read of header
fscanf(fr, "%s", pSix);
// check to see if it's a PPM image file
if (strncmp(pSix, "p6" , 10) != 0) {
printf("They are not the same\n");
} else {
printf("They are the same\n");
}
// read the rest of header
fscanf(fr, "%d\n %d\n", width, height);
fscanf(fr, "%d\n", maximum);
// check to see if they were stored properly
printf("PSix: %s\n", pSix);
printf("Width: %d\n", *width);
printf("Height: %d\n", *height);
printf("maximum: %d\n", *maximum);
// allocate array for pixels
unsigned char* pixels = new unsigned char[width * height];
// unformatted read of binary pixel data
while (fread(pixels, sizeof(pixel), 128, fr)) {
printf("%s", pixels);
} // end of for loop
// close file
fclose(fr);
// return the array
return pixels;
} // end of readPPM
2 回答
您没有将char读入正确的位置 .
pixels
已经是指向char
的指针,所以你应该按原样传递给fscanf
:当然还有其他问题,但我应该让你通过这个障碍 .