按照uf_file例程修改了程序，想要在test.txt文件中追加内容，结果追加不上（多次运行例程应该会有多个hello Tuya，但是结果没有），复制了一份测试例程放到main线程中用于测试上电读取test.txt文件内容结果发现保存的数据读取不到。
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***********************************************************
***********************function define**********************
***********************************************************/
/**
* @brief base db task
*
* @param[in] param:Task parameters
* @return none
*/
VOID example_uf_file(INT_T argc, CHAR_T *argv[])
{
OPERATE_RET op_ret = OPRT_OK;
UCHAR_T * fd = NULL;
UCHAR_T write_buff[] = {"Hello tuya"};
UCHAR_T *read_buff = NULL;
static INT_T write_num = 0;
INT_T read_num = 0;
BOOL_T temp = TRUE;
TAL_PR_NOTICE("------ uf file example start ------");
/*open file, read and write mode*/
fd = ufopen("test.txt", "w+");
if(NULL == fd) {
TAL_PR_ERR("file open fail");
} else {
TAL_PR_DEBUG("fd : %d", *fd);
}
/*change offset*/
ufseek(fd, 0, UF_SEEK_END);
/*write*/
write_num += ufwrite(fd, write_buff, strlen((const char *)write_buff));
TAL_PR_DEBUG("write number : %d", write_num);
/*check if the current offset reach the end of the file*/
temp = ufeof(fd);
if(temp) {
TAL_PR_DEBUG("offset is at the end");
} else {
TAL_PR_DEBUG("offset is not at the end");
}
/*change offset*/
ufseek(fd, 0, UF_SEEK_SET);
/*get current offset of the unique file*/
op_ret = uftell(fd);
TAL_PR_DEBUG("current offset : %d", op_ret);
/*get the size of the unique file*/
op_ret = ufgetsize("test.txt");
TAL_PR_DEBUG("file size: %d", op_ret);
/*read*/
read_buff = (UCHAR_T *)tal_malloc(sizeof(CHAR_T)*write_num + 1);
if(NULL == read_buff) {
TAL_PR_ERR("read buff malloc fail!");
}
read_num = ufread(fd, read_buff, write_num);
TAL_PR_DEBUG("reads num: %d, read buff: %s", read_num, read_buff);
/*close*/
op_ret = ufclose(fd);
if(OPRT_OK != op_ret) {
TAL_PR_ERR("err<%d>, close fail!", op_ret);
}
/*delete file*/
// op_ret = ufdelete("test.txt");
// if(OPRT_OK != op_ret) {
// TAL_PR_ERR("err<%d>,delete file fail!", op_ret);
// }
tal_free(read_buff);
return;
}
VOID read_example_uf_file(void)
{
OPERATE_RET op_ret = OPRT_OK;
UCHAR_T * fd = NULL;
UCHAR_T write_buff[] = {"Hello tuya"};
UCHAR_T *read_buff = NULL;
INT_T write_num = 50;
INT_T read_num = 0;
BOOL_T temp = TRUE;
TAL_PR_NOTICE("------ uf file example start ------");
/*open file, read and write mode*/
fd = ufopen("test.txt", "r");
if(NULL == fd) {
TAL_PR_ERR("file open fail");
} else {
TAL_PR_DEBUG("fd : %d", *fd);
}
/*write*/
// write_num = ufwrite(fd, write_buff, strlen((const char *)write_buff));
// TAL_PR_DEBUG("write number : %d", write_num);
/*check if the current offset reach the end of the file*/
temp = ufeof(fd);
if(temp) {
TAL_PR_DEBUG("offset is at the end");
} else {
TAL_PR_DEBUG("offset is not at the end");
}
/*change offset*/
ufseek(fd, 0, UF_SEEK_SET);
/*get current offset of the unique file*/
op_ret = uftell(fd);
TAL_PR_DEBUG("current offset : %d", op_ret);
/*get the size of the unique file*/
op_ret = ufgetsize("test.txt");
TAL_PR_DEBUG("file size: %d", op_ret);
/*read*/
read_buff = (UCHAR_T *)tal_malloc(sizeof(CHAR_T)*write_num + 1);
if(NULL == read_buff) {
TAL_PR_ERR("read buff malloc fail!");
}
read_num = ufread(fd, read_buff, write_num);
TAL_PR_DEBUG("reads num: %d, read buff: %s", read_num, read_buff);
/*close*/
op_ret = ufclose(fd);
if(OPRT_OK != op_ret) {
TAL_PR_ERR("err<%d>, close fail!", op_ret);
}
/*delete file*/
op_ret = ufdelete("test.txt");
if(OPRT_OK != op_ret) {
TAL_PR_ERR("err<%d>,delete file fail!", op_ret);
}
tal_free(read_buff);
return;
}