Download NHK English news podcast automatically. This application requires mpod mother board. See also http://mbed.org/users/geodenx/notebook/mpod/
Dependencies: BlinkLed HTTPClient EthernetInterface FatFileSystemCpp MSCFileSystem mbed-rtos mbed
Download NHK English news podcast automatically. This application requires mpod mother board. See also http://mbed.org/users/geodenx/notebook/mpod/
main.cpp
- Committer:
- togayan
- Date:
- 2012-08-19
- Revision:
- 3:07562878d3c3
- Parent:
- 2:0da3a4508b46
- Child:
- 4:ab3092d15121
File content as of revision 3:07562878d3c3:
#include "mbed.h" #include "MSCFileSystem.h" #include "EthernetInterface.h" #include "HTTPClient.h" #include "HTTPFile.h" #include "BlinkLed.h" #include "tinyxml2.h" using namespace tinyxml2; int GetFile(const char *path, const char *url); EthernetInterface eth; HTTPClient http; MSCFileSystem usb("usb"); BlinkLed led1(LED1, 0.02); BlinkLed led2(LED2, 0.2); BlinkLed ethGreen(p26, 0.02); BlinkLed ethYellow(p25, 0.2); DigitalOut fsusb30s(p9); Timer timer; const char* rssUrl = "http://www3.nhk.or.jp/rj/podcast/rss/english.xml"; const char* rssPath = "/usb/english.xml"; const char* mp3Path = "/usb/english.mp3"; int main() { printf("\n\n================================\n"); printf("mpod NHK English news Downloader\n"); printf("================================\n\n"); // FSUSB30 switches to HSD1 (mbed) printf("USB host was switched to HSD1(mbed).\n\n"); fsusb30s = 0; // HSD1 // Network setup printf("Setup EtherNet with DHCP.\n"); eth.init(); //Use DHCP eth.connect(); // Obtain original lastBuildDate char lastBuildDateOriginal[128] = {0}; { XMLDocument docOriginal; if(XML_SUCCESS != docOriginal.LoadFile(rssPath)) { strcpy(lastBuildDateOriginal, "No original english.xml in USB memory"); } else { XMLElement* lastBuildDateOriginalElement = docOriginal.FirstChildElement("rss")->FirstChildElement("channel")->FirstChildElement("lastBuildDate"); if(NULL == lastBuildDateOriginalElement) { strcpy(lastBuildDateOriginal, "No \"lastBuildDate\" element in original RSS"); } else { strcpy(lastBuildDateOriginal, lastBuildDateOriginalElement->GetText()); } } } printf("\nlastBuildDate (original): %s\n", lastBuildDateOriginal); // Download RSS GetFile(rssPath, rssUrl); // Obtain current lastBuildDate char lastBuildDateCurrent[128] = {0}; char mp3Url[256] = {0}; char mp3Length[32] = {0}; { XMLDocument docCurrent; if(XML_SUCCESS != docCurrent.LoadFile(rssPath)) { fsusb30s = 1; // HSD2 error("No current english.xml in USB memory.\n"); } XMLElement* lastBuildDateCurrentElement = docCurrent.FirstChildElement("rss")->FirstChildElement("channel")->FirstChildElement("lastBuildDate"); if(NULL == lastBuildDateCurrentElement) { fsusb30s = 1; // HSD2 error("No \"lastBuildDate\" element in current RSS.\n"); } strcpy(lastBuildDateCurrent, lastBuildDateCurrentElement->GetText()); XMLElement* enclosureElement = docCurrent.FirstChildElement("rss")->FirstChildElement("channel")->FirstChildElement("item")->FirstChildElement("enclosure"); if(NULL == enclosureElement) { fsusb30s = 1; // HSD2 error("No \"enclosure\" element in current RSS.\n"); } strcpy(mp3Url, enclosureElement->Attribute("url")); strcpy(mp3Length, enclosureElement->Attribute("length")); } printf("\nlastBuildDate (current) : %s\n", lastBuildDateCurrent); // Determine the necessity of downloading new MP3. bool flgDownloadMp3 = false; if ( strcmp(lastBuildDateOriginal, lastBuildDateCurrent) == 0 ) { printf("lastBuildDate (original) == lastBuildDate (current)\n"); FILE* mp3fp = fopen(mp3Path, "r"); // check an existance of english.mp3 if (mp3fp != NULL) { fseek(mp3fp, 0, SEEK_END); // seek to end of file if (ftell(mp3fp) != atol(mp3Length)) { printf("MP3 file size is invalid.\n"); flgDownloadMp3 = true; } fclose(mp3fp); } else { printf("However, no enlish.mp3 in USB memory\n"); flgDownloadMp3 = true; } } else { printf("lastBuildDate (original) != lastBuildDate (current)\n"); flgDownloadMp3 = true; } // Download new MP3 if(flgDownloadMp3 == true) { GetFile(mp3Path, mp3Url); } // Wait for the completion of writing to USB Mass Storage Device. wait(1); // FSUSB30 switches to HSD2 (External Device) printf("\nUSB host was switched to HSD2(External Device).\n"); fsusb30s = 1; // HSD2 // blink LED led1.startBlink(); ethGreen.startBlink(); while(true){} } int GetFile(const char *path, const char *url) { led2.startBlink(); ethYellow.startBlink(); printf("\nGetting %s\n", url); timer.stop(); timer.reset(); timer.start(); HTTPFile file(path); HTTPResult retGet = http.get(url, &file); if (retGet != HTTP_OK) { fsusb30s = 1; // HSD2 error("Error in http.get in GetFile(): %d\n", retGet); } file.clear(); timer.stop(); printf("timer.read_ms(): %d\n", timer.read_ms()); led2.finishBlink(); ethYellow.finishBlink(); return (0); }