读取PPM文件RGB值C ++ [英] Read PPM files RGB values C++
本文介绍了读取PPM文件RGB值C ++的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试从PPM文件中读取. 我想读取此文件中每一行的第一个,第二个和第三个数字,但我不知道该怎么读.
I'm trying read from a PPM file. I want to read the first, second and third number from each row, in this file, but I don´t know how to read the lines.
这是我到目前为止所拥有的:
This is what I have so far:
for (int y = 4; y <= HEIGHT; y++) { // i think it has to start on row 4
for (int x = 1; x <= WIDTH; x++) { // and x from 1
int i = 4;
int r = CurrentR(i);
int g = CurrentG(i);
int b = CurrentB(i);
i++;
}
}
int CurrentR(int I) {
return // the first number in row xy
}
int CurrentG(int I) {
return // the second number in row xy
}
int CurrentB(int I) {
return // the third number in row xy
}
推荐答案
这是我建议您这样做的方式:
This is how I would suggest you to do it:
struct RGB {
int R,B,G;
}
std::ifstream& operator>>(std::ifstream &in,RGB& rgb){
in >> rgb.R;
in >> rgb.G;
in >> rgb.B;
return in;
}
std::ostream& operator<<(std::ostream &out,RGB& rgb){
out << rgb.R << " ";
out << rgb.G << " ";
out << rgb.B << std::endl;
return out;
}
int main(){
std::string filename = "test.txt";
std::ifstream file(filename.c_str());
if(file.is_open()) {
std::string line;
for (int i=0;i<4;i++) { std::getline(file,line); }
RGB rgb;
for (int i=0;i<LINES_TO_READ;i++) {
file >> rgb;
std::cout << rgb;
}
}
}
这篇关于读取PPM文件RGB值C ++的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文