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Using Null-terminated Strings

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Your Unicode applications should always cast zero to TCHAR when using null-terminated strings. The code 0x0000 is the Unicode string terminator for a null-terminated string. A single null byte is not sufficient for this code, because many Unicode characters contain null bytes as either the high or the low byte. An example is the letter A, for which the character code is 0x0041.

Using Special Characters in Unicode