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andy
2025-07-05 19:47:28 +08:00
parent 8c12c1ffc3
commit 079aa9f868
550 changed files with 13358 additions and 17326 deletions
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38
Project/Src/rt-thread/examples/file/readwrite.c
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@@ -1,24 +1,24 @@
/*
* 代码清单：文件读写例子
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>嵥<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*
* 这个例子演示了如何读写一个文件，特别是写的时候应该如何操作。
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ζ<EFBFBD>дһ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ر<EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>β<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*/
#include <rtthread.h>
#include <dfs_posix.h> /* 当需要使用文件操作时，需要包含这个头文件 */
#include <dfs_posix.h> /* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫʹ<EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD> */
#define TEST_FN "/test.dat"
/* 测试用的数据和缓冲 */
/* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݺͻ<EFBFBD><EFBFBD><EFBFBD> */
static char test_data[120], buffer[120];
/* 文件读写测试 */
/* <EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
void readwrite(const char* filename)
{
int fd;
int index, length;
/* 只写 & 创建 打开 */
/* ֻд & <EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD> */
fd = open(TEST_FN, O_WRONLY | O_CREAT | O_TRUNC, 0);
if (fd < 0)
{
@@ -26,13 +26,13 @@ void readwrite(const char* filename)
return;
}
/* 准备写入数据 */
/* ׼<EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
for (index = 0; index < sizeof(test_data); index ++)
{
test_data[index] = index + 27;
}
/* 写入数据 */
/* д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
length = write(fd, test_data, sizeof(test_data));
if (length != sizeof(test_data))
{
@@ -41,10 +41,10 @@ void readwrite(const char* filename)
return;
}
/* 关闭文件 */
/* <EFBFBD>ر<EFBFBD><EFBFBD>ļ<EFBFBD> */
close(fd);
/* 只写并在末尾添加打开 */
/* ֻд<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĩβ<EFBFBD><EFBFBD><EFBFBD>Ӵ<EFBFBD><EFBFBD><EFBFBD> */
fd = open(TEST_FN, O_WRONLY | O_CREAT | O_APPEND, 0);
if (fd < 0)
{
@@ -59,10 +59,10 @@ void readwrite(const char* filename)
close(fd);
return;
}
/* 关闭文件 */
/* <EFBFBD>ر<EFBFBD><EFBFBD>ļ<EFBFBD> */
close(fd);
/* 只读打开进行数据校验 */
/* ֻ<EFBFBD><EFBFBD><EFBFBD>򿪽<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD> */
fd = open(TEST_FN, O_RDONLY, 0);
if (fd < 0)
{
@@ -70,7 +70,7 @@ void readwrite(const char* filename)
return;
}
/* 读取数据(应该为第一次写入的数据) */
/* <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>(Ӧ<><D3A6>Ϊ<EFBFBD><CEAA>һ<EFBFBD><D2BB>д<EFBFBD><D0B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>) */
length = read(fd, buffer, sizeof(buffer));
if (length != sizeof(buffer))
{
@@ -79,7 +79,7 @@ void readwrite(const char* filename)
return;
}
/* 检查数据是否正确 */
/* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD>ȷ */
for (index = 0; index < sizeof(test_data); index ++)
{
if (test_data[index] != buffer[index])
@@ -90,7 +90,7 @@ void readwrite(const char* filename)
}
}
/* 读取数据(应该为第二次写入的数据) */
/* <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>(Ӧ<><D3A6>Ϊ<EFBFBD>ڶ<EFBFBD><DAB6><EFBFBD>д<EFBFBD><D0B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>) */
length = read(fd, buffer, sizeof(buffer));
if (length != sizeof(buffer))
{
@@ -99,7 +99,7 @@ void readwrite(const char* filename)
return;
}
/* 检查数据是否正确 */
/* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD>ȷ */
for (index = 0; index < sizeof(test_data); index ++)
{
if (test_data[index] != buffer[index])
@@ -110,14 +110,14 @@ void readwrite(const char* filename)
}
}
/* 检查数据完毕，关闭文件 */
/* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϣ<EFBFBD><EFBFBD>ر<EFBFBD><EFBFBD>ļ<EFBFBD> */
close(fd);
/* 打印结果 */
/* <EFBFBD><EFBFBD>ӡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
rt_kprintf("read/write done.\n");
}
#ifdef RT_USING_FINSH
#include <finsh.h>
/* 输出函数到finsh shell命令行中 */
/* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>finsh shell<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
FINSH_FUNCTION_EXPORT(readwrite, perform file read and write test);
#endif