SDFileSys_with_Rename - Example writing to SD card, sford (original) 21 …

Users » YouTahDoug » Code » SDFileSys_with_Rename

Doug Wendelboe / Mbed 2 deprecated SDFileSys_with_Rename

Example writing to SD card, sford (original) 21 June 2011: Enhanced by D. Wendelboe to test SD file and directories. Illustrates the following: * rename a file (via copy & delete old). * copy an existing file to a new file. * listing of SD directory names. TODO: Add method to list filenames in a directory. Add a method to return file length.

Dependencies: mbed

main.cpp@1:4a0985d3a848, 2011-06-22 (annotated)

Committer:: YouTahDoug
Date:: Wed Jun 22 16:52:20 2011 +0000
Revision:: 1:4a0985d3a848
Parent:: 0:d0eea54553ed

Who changed what in which revision?

User	Revision	Line number	New contents of line
YouTahDoug	1:4a0985d3a848	1	//*****************************************************************************
YouTahDoug	1:4a0985d3a848	2	// Example writing to SD card, sford
YouTahDoug	1:4a0985d3a848	3	//
YouTahDoug	1:4a0985d3a848	4	// 21 June 2011: Enhanced by D. Wendelboe to test SD file and directories.
YouTahDoug	1:4a0985d3a848	5	// Illustrates the following:
YouTahDoug	1:4a0985d3a848	6	// * rename a file (via copy & delete old).
YouTahDoug	1:4a0985d3a848	7	// * copy an existing file to a new file.
YouTahDoug	1:4a0985d3a848	8	// * listing of SD directory names.
YouTahDoug	1:4a0985d3a848	9	//
YouTahDoug	1:4a0985d3a848	10	// TODO: Add method to list filenames in a directory.
YouTahDoug	1:4a0985d3a848	11	// Add a method to return file length.
YouTahDoug	1:4a0985d3a848	12	//*****************************************************************************
YouTahDoug	1:4a0985d3a848	13
YouTahDoug	1:4a0985d3a848	14	#include "mbed.h"
YouTahDoug	1:4a0985d3a848	15	#include "SDFileSystem.h"
YouTahDoug	1:4a0985d3a848	16
YouTahDoug	1:4a0985d3a848	17	#define PC_BAUD 38400
YouTahDoug	1:4a0985d3a848	18
YouTahDoug	1:4a0985d3a848	19	SDFileSystem sd(p5, p6, p7, p8, "sd");
YouTahDoug	1:4a0985d3a848	20	Serial pc(USBTX,USBRX);
YouTahDoug	1:4a0985d3a848	21
YouTahDoug	1:4a0985d3a848	22	int file_rename(const char oldfname, const char newfname);
YouTahDoug	1:4a0985d3a848	23	int file_copy(const char src, const char dst);
YouTahDoug	1:4a0985d3a848	24
YouTahDoug	1:4a0985d3a848	25	int main()
YouTahDoug	1:4a0985d3a848	26	{
YouTahDoug	1:4a0985d3a848	27	int i, status;
YouTahDoug	1:4a0985d3a848	28	pc.baud(PC_BAUD);
YouTahDoug	1:4a0985d3a848	29
YouTahDoug	1:4a0985d3a848	30	printf("\nExercise SD Card functions\n");
YouTahDoug	1:4a0985d3a848	31
YouTahDoug	1:4a0985d3a848	32	printf("Create 3 directories on SD Card.\n");
YouTahDoug	1:4a0985d3a848	33	mkdir("/sd/mydir1", 0777);
YouTahDoug	1:4a0985d3a848	34	mkdir("/sd/mydir2", 0777);
YouTahDoug	1:4a0985d3a848	35	mkdir("/sd/mydir3", 0777);
YouTahDoug	1:4a0985d3a848	36
YouTahDoug	1:4a0985d3a848	37	//--------------------------------------------------------------
YouTahDoug	1:4a0985d3a848	38	printf("Create \"/sd/mydir1/sdtest.txt\" and write some data in it\n");
YouTahDoug	1:4a0985d3a848	39
YouTahDoug	1:4a0985d3a848	40	FILE *fp = fopen("/sd/mydir1/sdtest.txt", "w");
YouTahDoug	1:4a0985d3a848	41	if(fp == NULL) {
YouTahDoug	1:4a0985d3a848	42	error("Could not open file for write\n");
YouTahDoug	1:4a0985d3a848	43	}
YouTahDoug	1:4a0985d3a848	44	fprintf(fp, "Hello SD Card World!\n");
YouTahDoug	1:4a0985d3a848	45	for (i=0; i<10; i++) {
YouTahDoug	1:4a0985d3a848	46	fprintf(fp, "Line #%i\n", i);
YouTahDoug	1:4a0985d3a848	47	}
YouTahDoug	1:4a0985d3a848	48	fclose(fp);
YouTahDoug	1:4a0985d3a848	49
YouTahDoug	1:4a0985d3a848	50	//--------------------------------------------------------------
YouTahDoug	1:4a0985d3a848	51	printf("Open directory on /sd\n");
YouTahDoug	1:4a0985d3a848	52	DIR *d = opendir("/sd");
YouTahDoug	1:4a0985d3a848	53	struct dirent *p;
YouTahDoug	1:4a0985d3a848	54	while((p = readdir(d)) != NULL) {
YouTahDoug	1:4a0985d3a848	55	printf("%s\n", p->d_name);
YouTahDoug	1:4a0985d3a848	56	}
YouTahDoug	1:4a0985d3a848	57	closedir(d);
YouTahDoug	1:4a0985d3a848	58	printf("Directory closed\n");
YouTahDoug	1:4a0985d3a848	59
YouTahDoug	1:4a0985d3a848	60	//--------------------------------------------------------------
YouTahDoug	1:4a0985d3a848	61	printf("Remove /sd/mydir3\n");
YouTahDoug	1:4a0985d3a848	62	remove("/sd/mydir3");
YouTahDoug	1:4a0985d3a848	63
YouTahDoug	1:4a0985d3a848	64	//--------------------------------------------------------------
YouTahDoug	1:4a0985d3a848	65	printf("List directory again. mydir3 should be gone.\n");
YouTahDoug	1:4a0985d3a848	66	d = opendir("/sd");
YouTahDoug	1:4a0985d3a848	67	while((p = readdir(d)) != NULL) {
YouTahDoug	1:4a0985d3a848	68	printf("%s\n", p->d_name);
YouTahDoug	1:4a0985d3a848	69	}
YouTahDoug	1:4a0985d3a848	70	closedir(d);
YouTahDoug	1:4a0985d3a848	71
YouTahDoug	1:4a0985d3a848	72	//--------------------------------------------------------------
YouTahDoug	1:4a0985d3a848	73	printf("Rename \"/sd/mydir1/sdtest.txt\" to \"/sd/mydir1/new_name.txt\"\n");
YouTahDoug	1:4a0985d3a848	74	status = file_rename("/sd/mydir1/sdtest.txt", "/sd/mydir1/new_name.txt");
YouTahDoug	1:4a0985d3a848	75
YouTahDoug	1:4a0985d3a848	76	if (status == -1) printf("Error: file not renamed. (status=%d)\n", status);
YouTahDoug	1:4a0985d3a848	77	else printf("Success: file renamed OK (status=%d)\n", status);
YouTahDoug	1:4a0985d3a848	78
YouTahDoug	1:4a0985d3a848	79	//--------------------------------------------------------------
YouTahDoug	1:4a0985d3a848	80	printf("Copy \"/sd/mydir1/doug.txt\" to \"/sd/mydir1/new_copy.txt\"\n");
YouTahDoug	1:4a0985d3a848	81	status = file_copy("/sd/mydir1/new_name.txt", "/sd/mydir1/new_copy.txt");
YouTahDoug	1:4a0985d3a848	82
YouTahDoug	1:4a0985d3a848	83	if (status == -1) printf("Error: file not copied. (status=%d)\n", status);
YouTahDoug	1:4a0985d3a848	84	else printf("Success: file copied OK (status=%d)\n", status);
YouTahDoug	1:4a0985d3a848	85
YouTahDoug	1:4a0985d3a848	86	//--------------------------------------------------------------
YouTahDoug	1:4a0985d3a848	87	printf("Done.\n");
YouTahDoug	1:4a0985d3a848	88	}
YouTahDoug	1:4a0985d3a848	89
YouTahDoug	1:4a0985d3a848	90	//***********************************************************
YouTahDoug	1:4a0985d3a848	91	// file_rename: renames a file (via copy & delete).
YouTahDoug	1:4a0985d3a848	92	// Moves data instead of adjusting the file name in the
YouTahDoug	1:4a0985d3a848	93	// file directory. Checks to insure the file was renamed.
YouTahDoug	1:4a0985d3a848	94	// Returns -1 = error; 0 = success
YouTahDoug	1:4a0985d3a848	95	//***********************************************************
YouTahDoug	1:4a0985d3a848	96	int file_rename(const char oldfname, const char newfname) {
YouTahDoug	1:4a0985d3a848	97	int retval = 0;
YouTahDoug	1:4a0985d3a848	98	int ch;
YouTahDoug	1:4a0985d3a848	99
YouTahDoug	1:4a0985d3a848	100	FILE *fpold = fopen(oldfname, "r"); // src file
YouTahDoug	1:4a0985d3a848	101	FILE *fpnew = fopen(newfname, "w"); // dest file
YouTahDoug	1:4a0985d3a848	102
YouTahDoug	1:4a0985d3a848	103	while (1) { // Copy src to dest
YouTahDoug	1:4a0985d3a848	104	ch = fgetc(fpold); // until src EOF read.
YouTahDoug	1:4a0985d3a848	105	if (ch == EOF) break;
YouTahDoug	1:4a0985d3a848	106	fputc(ch, fpnew);
YouTahDoug	1:4a0985d3a848	107	}
YouTahDoug	1:4a0985d3a848	108
YouTahDoug	1:4a0985d3a848	109	fclose(fpnew);
YouTahDoug	1:4a0985d3a848	110	fclose(fpold);
YouTahDoug	1:4a0985d3a848	111
YouTahDoug	1:4a0985d3a848	112	fpnew = fopen(newfname, "r"); // Reopen dest to insure
YouTahDoug	1:4a0985d3a848	113	if(fpnew == NULL) { // that it was created.
YouTahDoug	1:4a0985d3a848	114	retval = (-1); // Return Error.
YouTahDoug	1:4a0985d3a848	115	}
YouTahDoug	1:4a0985d3a848	116	else {
YouTahDoug	1:4a0985d3a848	117	fclose(fpnew);
YouTahDoug	1:4a0985d3a848	118	remove(oldfname); // Remove original file.
YouTahDoug	1:4a0985d3a848	119	retval = (0); // Return Success.
YouTahDoug	1:4a0985d3a848	120	}
YouTahDoug	1:4a0985d3a848	121	return (retval);
YouTahDoug	1:4a0985d3a848	122	}
YouTahDoug	1:4a0985d3a848	123
YouTahDoug	1:4a0985d3a848	124	//***********************************************************
YouTahDoug	1:4a0985d3a848	125	// file_copy: Copies a file
YouTahDoug	1:4a0985d3a848	126	// Checks to insure destination file was created.
YouTahDoug	1:4a0985d3a848	127	// Returns -1 = error; 0 = success
YouTahDoug	1:4a0985d3a848	128	//***********************************************************
YouTahDoug	1:4a0985d3a848	129	int file_copy (const char src, const char dst) {
YouTahDoug	1:4a0985d3a848	130	int retval = 0;
YouTahDoug	1:4a0985d3a848	131	int ch;
YouTahDoug	1:4a0985d3a848	132
YouTahDoug	1:4a0985d3a848	133	FILE *fpsrc = fopen(src, "r"); // src file
YouTahDoug	1:4a0985d3a848	134	FILE *fpdst = fopen(dst, "w"); // dest file
YouTahDoug	1:4a0985d3a848	135
YouTahDoug	1:4a0985d3a848	136	while (1) { // Copy src to dest
YouTahDoug	1:4a0985d3a848	137	ch = fgetc(fpsrc); // until src EOF read.
YouTahDoug	1:4a0985d3a848	138	if (ch == EOF) break;
YouTahDoug	1:4a0985d3a848	139	fputc(ch, fpdst);
YouTahDoug	1:4a0985d3a848	140	}
YouTahDoug	1:4a0985d3a848	141	fclose(fpsrc);
YouTahDoug	1:4a0985d3a848	142	fclose(fpdst);
YouTahDoug	1:4a0985d3a848	143
YouTahDoug	1:4a0985d3a848	144	fpdst = fopen(dst, "r"); // Reopen dest to insure
YouTahDoug	1:4a0985d3a848	145	if(fpdst == NULL) { // that it was created.
YouTahDoug	1:4a0985d3a848	146	retval = (-1); // Return error.
YouTahDoug	1:4a0985d3a848	147	}
YouTahDoug	1:4a0985d3a848	148	else {
YouTahDoug	1:4a0985d3a848	149	fclose(fpdst);
YouTahDoug	1:4a0985d3a848	150	retval = (0); // Return success.
YouTahDoug	1:4a0985d3a848	151	}
YouTahDoug	1:4a0985d3a848	152	return (retval);
YouTahDoug	1:4a0985d3a848	153	}
YouTahDoug	1:4a0985d3a848	154

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	21 Jun 2011
Imports:	110
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	8

main.cpp@1:4a0985d3a848, 2011-06-22 (annotated)

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