CC3235S中如何正确使用Fs_Open()打开文件夹下的文件

您好，最近在使用OOB工程时，遇到一个棘手的问题，用UNiflash将文件添加到www文件夹目录下后，需要在代码中打开并读写www文件夹下面的那个文件，可是用Fs_Open()接口，却提示文件不存在。是代码有错吗？

char *DeviceFileName = "\www\test.txt";
longDeviceFileHandle = -1;
_i32fsRetVal;//negative retval is an error
unsigned longOffset = 0;
unsigned charInputBuffer[100];
_u32MasterToken = 0;
memset(InputBuffer,0,sizeof(InputBuffer));

DeviceFileHandle =  sl_FsOpen((unsigned char *)DeviceFileName,  SL_FS_READ, &MasterToken);
fsRetVal = sl_FsRead( DeviceFileHandle, Offset, (unsigned char *)InputBuffer,50);
fsRetVal = sl_FsClose(DeviceFileHandle, NULL, NULL , 0);

Viki Shi：

参考下面的代码，创建文件并写入数据:

char*DeviceFileName = "MyFile.txt";
unsigned longMaxSize = 63 * 1024; //62.5K is max file size
longDeviceFileHandle = -1;
_i32RetVal;//negative retval is an error
unsigned longOffset = 0;
unsigned charInputBuffer[100];
_u32MasterToken = 0;
// Create a file and write data. The file in this example is secured, without signature and with a fail safe commit
//create a secure file if not exists and open it for write.
DeviceFileHandle =sl_FsOpen(unsigned char *)DeviceFileName,SL_FS_CREATE|SL_FS_OVERWRITE | SL_FS_CREATE_SECURE | SL_FS_CREATE_NOSIGNATURE | SL_FS_CREATE_MAX_SIZE( MaxSize ),&MasterToken);
Offset = 0;
//Preferred in secure file that the Offset and the length will be aligned to 16 bytes.
RetVal = sl_FsWrite( DeviceFileHandle, Offset, (unsigned char *)"HelloWorld", strlen("HelloWorld"));
RetVal = sl_FsClose(DeviceFileHandle, NULL, NULL , 0);
// open the same file for read, using the Token we got from the creation procedure above
DeviceFileHandle =sl_FsOpen(unsigned char *)DeviceFileName,SL_FS_READ,&MasterToken);
Offset = 0;
RetVal = sl_FsRead( DeviceFileHandle, Offset, (unsigned char *)InputBuffer, strlen("HelloWorld"));
RetVal = sl_FsClose(DeviceFileHandle, NULL, NULL , 0);

user4696099：

回复 Viki Shi:

这个步骤操作过，可是这样新建的文件会存在根目录里面，没有在根目录的www文件夹下，请问如何将文件写到文件夹下呢？

Viki Shi：

回复 user4696099:

你是如何添加的，下图这样add file吗？

Viki Shi：

回复 user4696099:

解决就好，我猜也是添加文件方式不对

user4696099：

回复 Viki Shi:

和添加文件的方式没太大关系，主要是代码里面在加在文件名的地方应该是“/www/devname”而不是“\www\devname”，具体的可以查看SDK里面的Documentation_Overview.html文档

Viki Shi：

回复 user4696099:

收到，感谢提供反馈