Another way to determine if a file exists _access and _waccess

Function Prototypes:

int _access (const char *path, int mode );

int _waccess (const wchar_t *path, int mode );

Example code:

[CPP]View PlainCopy

2. #include <io.h>
4. #include <stdio.h>
6. #include <stdlib.h>
10. int _tmain (int argc, _tchar* argv[])
12. {
14. //If the file has the specified access rights, the function returns 0
16. returns 1 if the file does not exist or does not have access to the specified permission
20. //Notes
22. //When path is a file, the _access function determines whether the file exists and determines whether the file can be accessed in the mode specified by the model value
24. //When path is a directory, _access only determines whether the specified directory exists, and in WindowsNT and Windows2000, all directories have read and write permissions
28. //mode Value
30. //00 checks whether the file exists
32. //02 Write Permissions
34. //04 Read Permissions
36. //06 Read and Write permissions
40. //_waccess is a wide-character version of _access
42. if (_access ("Demo.txt", 0)! =-1)
44. {
46. printf ("The Demo.txt exist\n");
50. //Determine if the file is writable, assuming the file is read-only
52. if (_access ("Demo.txt", 2) = =-1)
54. {
56. printf ("The demo.txt does not having write permission\n");
58. }
60. Else
62. {
64. printf ("The Demo.txt has write permission\n");
66. }
68. }
70. Else
72. {
74. printf ("The demo.txt does not exist\n");
76. }
80. System ("pause");
82. return 0;
84. }

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Another way to determine if a file exists _access and _waccess