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Data Type question

Posted on 1998-08-31
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Last Modified: 2010-04-10
I have a snippet of code:
for (i=0; i<TagCount; i++)
{
iErr = ADL_Tag_Get(TDL, i + 1, &TagInfo);
if (TagInfo.name == "ZIP4")    //error here
break;
}

It gives me this error:
'==' : no conversion from 'char *' to 'unsigned char *'
                        
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Question by:ds1964
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milenvk earned 30 total points
ID: 1171763
I assume you are programming for any of the Windows operating systems.

This code here will do the job:

if(wcscmp(TagInfo.name, L"ZIP4") == 0) // error here
  break;

See, fisrt I don't think that '==' is the operator that will help you for string comparison. '==' compares the two pointers not the two strings. Further if you look at the declaration of the structure/class of TagInfo you will probably see that 'name' is of type LPWSTR or LPOLECHAR or any other alias to 'unsigned char*'. This is the wide character format and therefore you need to convert your literal constant "ZIP4" to wide character format. That's why there is an 'L' infront of "ZIP4" in my example. 'L' makes the constant wide format. And finally the function wcscmp is the wide character version of strcmp, which compares two strings and returns 0 if they are equal.
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