防城港门面做网站的,做360全景的网站,南昌建站方案,sem数据分析今天为了测试我的LCD有没有坏点写了一个简单的刷屏程序#xff0c;效果还不错#xff0c;分析给大家。代码如下#xff1a;#include #include #include #include #include #include #include #include int main(int argc,char *argv[]){int fbfd 0;struct fb_var_screeninf…今天为了测试我的LCD有没有坏点写了一个简单的刷屏程序效果还不错分析给大家。代码如下#include #include #include #include #include #include #include #include int main(int argc,char *argv[]){int fbfd 0;struct fb_var_screeninfo vinfo;struct fb_fix_screeninfo finfo;long int screensize 0;char *fbp 0;char inbuf[240*320*2];int i 0;/*open /dev/fb0 */fbfd open(/dev/fb0,O_RDWR);if(fbfd0){printf(Error:cannot open framebuffer devices./n);return -1;}printf(The framebuffer devices was opened successfully./n);/*get framebuffer infomation*/if(ioctl(fbfd,FBIOGET_FSCREENINFO,finfo)){printf(Error: reanding fixed informatin./n);return -1;}if(ioctl(fbfd,FBIOGET_VSCREENINFO,vinfo)){printf(Error: reanding var informatin./n);return -1;}/*set screensiez*/screensize vinfo.xres*vinfo.yres*vinfo.bits_per_pixel/8;/*mmap*/fbp (char*)mmap(0,screensize,PROT_READ|PROT_WRITE,MAP_SHARED,fbfd,0);if((int)fbp -1){printf(Error: failed to map framebuffer device to memory./n);return -4;}printf( The framebuffer device was mapped to memory sucessfully./n);memcpy(inbuf,fbp,screensize);//保存刷屏前显存中的数据for(i 0;i0xff;i){memset(fbp,i,screensize);sleep(1);}memcpy(fbp,inbuf,screensize);//将保存的显存数据复原回去munmap(fbp,screensize);printf(The framebuffer device was munmaped successfully./n);close(fbfd);printf(The framebuffer device was closed successfully./n);return 0;}
