<强> C++ >强>
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <cv.h>
#include <highgui.h>
#include <cstdio>
#include <sys/stat.h>
using namespace std;
using namespace cv;
int main(int argc, char *argv[]) {
const char *fifo_name = "fifo";
mknod(fifo_name, S_IFIFO | 0666, 0);
ifstream f(fifo_name);
string line;
getline(f, line);
auto data_size = stoi(line);
char *buf = new char[data_size];
f.read(buf, data_size);
Mat matimg;
matimg = imdecode(Mat(1, data_size, CV_8UC1, buf), CV_LOAD_IMAGE_UNCHANGED);
imshow("display", matimg);
waitKey(0);
return 0;
}
Python
import os
import cv2
fifo_name = 'fifo'
def main():
data = cv2.imread('testimage.jpg').tobytes()
try:
os.mkfifo(fifo_name)
except FileExistsError:
pass
with open(fifo_name, 'wb') as f:
f.write('{}\n'.format(len(data)).encode())
f.write(data)
if __name__ == '__main__':
main()
当C++尝试打印到图像时引发异常。我已经调试了代码,buf
被填充,但是matimg
是空的。你知道吗
如果在读取器尝试打开该管道时该管道不存在,则它可能会失败,也可能会在超时的情况下继续重新尝试打开命名管道。例如:
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