Who knows the full text of Ge Yanxing by Cao Pi, how many years has this poem been written, and what is the writing background?

Cao Piyan's songs are bleak in the autumn wind, the weather is slightly cool, the vegetation is shaking and the frost is exposed, and the Yan ci group belongs to the south of the Yangtze River. I miss you and your guests, and my heart breaks. I miss my hometown, so why should I leave it for a long time to send it to each other? I am alone in my room, afraid of forgetting my worries, and I don't feel tears on my clothes. Short songs cannot be long. The bright moon shines on my bed, and it's still early for the stars to flow west. Penny and Weaver looked at each other from a distance. Why should I restrict the river beam? This is the first of two songs written by Cao Pi. Ge Yanxing is a Yuefu theme, which belongs to the category of Pingdiao of Xianghe Song. It is similar to Xing He Xing, which reflects the life in their respective regions and has their own musical characteristics. Yan (Yān) was the name of the vassal state in the Western Zhou Dynasty and even in the Spring and Autumn Period and the Warring States Period, and its jurisdiction was about Beijing, northern Hebei and southwestern Liaoning. This is the border area between the Han nationality and the northern minorities. Since Qin and Han Dynasties, wars have frequently occurred. Therefore, the rulers of past dynasties have sent heavy troops to guard here. Of course, there are various services such as building a city and transferring traffic. Judging from the recent facts, in the twelfth year of Jian 'an (2007), Cao Cao's northern expedition to Wuhuan took place in the northern part of this ancient Yan country, which is now Xingcheng, Liaoning. As early as the Qin dynasty, there were works reflecting the sufferings of the war corvee in this area, "Be cautious when giving birth to men, and breast-feed women." The folk song "Don't look at the Great Wall, bones support each other" was even more famous in the Han Dynasty "Drinking horses in the Great Wall Cave". Cao Pi's Ge Yanxing is the inheritance and development of this kind of literary works in ideological content. Guo Maoqian's Yuefu Poems quoted Yuefu to solve problems and said: "Wei Wendi's two poems Autumn Wind and Another Day have changed in time sequence, and women have nothing to complain about." He also quoted Yuefu Guangti as saying: "Yan, the place name is also. It is said that there is a good man serving in Yan, which is also for this reason. " It is correct to understand the content of the work in this way. There are no ancient words in Ge Yanxing, and this tune may have originated from Cao Pi. This work reflects the historical phenomenon of 400 years since the Qin and Han Dynasties, and it is also the social reality of his recent Jian 'an period, showing the author's concern and sympathy for the sufferings of the lower classes.