Problem - Kevin Tafuro

GetFullPathName( ) requires the length of the buffer to be specified in
characters, not bytes. Likewise, the return value from the function will
be in units of characters rather than bytes. When allocating memory
for the buffer, be sure to multiply the number of characters by
sizeof(TCHAR).
If an error occurs in resolving the path, GetFullPathName( ) will return 0, and you can
call GetLastError( ) to determine the cause of the error; otherwise, it will return the
number of characters written into lpBuffer.
In the following example, SpcResolvePath( ) demonstrates how to use
GetFullPathName( ) properly. If it is successful, it will return a dynamically allocated
buffer that contains the resolved path; otherwise, it will return NULL. The allocated
buffer must be freed by calling LocalFree( ).
#include
LPTSTR SpcResolvePath(LPCTSTR lpFileName) {
DWORD dwLastError, nBufferLength;
LPTSTR lpBuffer, lpFilePart;
if (!(nBufferLength = GetFullPathName(lpFileName, 0, 0, &lpFilePart))) return 0;
if (!(lpBuffer = (LPTSTR)LocalAlloc(LMEM_FIXED, sizeof(TCHAR) * nBufferLength)))
return 0;
if (!GetFullPathName(lpFileName, nBufferLength, lpBuffer, &lpFilePart)) {
dwLastError = GetLastError( );
LocalFree(lpBuffer);
SetLastError(dwLastError);
return 0;
}
return lpBuffer;
}
3.8 Evaluating URL Encodings
Problem
You need to decode a Uniform Resource Locator (URL).
Solution
Iterate over the characters in the URLlooking for a percent symbol followed by two
hexadecimal digits. When such a sequence is encountered, combine the hexadecimal
digits to obtain the character with which to replace the entire sequence. For
example, in the ASCII character set, the letter “A” has the value 0x41, which could be
encoded as “%41”.
This is the Title of the Book, eMatter Edition
Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.
Evaluating URL Encodings | 99