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copied!<p>The msdn article says:</p> <blockquote> <p>"The input string is a sequence of characters that can be interpreted as a numerical value of the specified type. The function stops reading the input string at the first character that it cannot recognize as part of a number."</p> </blockquote> <p>If you test the code with unicode strings containing actual numbers, you'll see the correct output:</p> <pre><code>printf("TEST 1: %d \n", _tstoi(_T("1"))); </code></pre> <p>output:</p> <pre><code>TEST 1: 1 </code></pre> <p>Like @Ylisar said, the *toi functions are used to convert number values from strings to integer variables instead.</p> <p>The following code will output the number representation instead, but watch out for the pointer representation of the const variables. I've left both versions so you can see the difference:</p> <pre><code> printf("TEST 1: %d \n", _tstoi(_T("1"))); printf("TEST a: %d \n", _tstoi(_T("a"))); WCHAR* b(_T("b")); printf("TEST A: %d \n", _T("A")); printf("TEST b: %d \n", *b); </code></pre> <p>Output:</p> <pre><code>TEST 1: 1 TEST a: 0 TEST A: 13457492 TEST b: 98 </code></pre> <p>Check out more at <a href="http://msdn.microsoft.com/en-us/library/yd5xkb5c%28v=vs.80%29.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/yd5xkb5c%28v=vs.80%29.aspx</a></p> <p>If you want to sum up (accumulate) the values, I would recommend you checking out the STL range functions which does wonders on such things. For example</p> <pre><code>#include <numeric> #include <string> printf("TEST a: %d \n", *_T("a")); // 97 printf("TEST b: %d \n", *_T("b")); // 98 wstring uString(_T("ba")); int result = accumulate(uString.begin(), uString.end(), 0); printf("TEST accumulated: %d \n", result); </code></pre> <p>Results:</p> <pre><code>TEST a: 97 TEST b: 98 TEST accumulated: 195 </code></pre> <p>This way you don't have to have for-loops going through all the values. The range functions really are nice for stuff like this.</p> <p>Check out more at: <a href="http://www.sgi.com/tech/stl/accumulate.html" rel="nofollow">http://www.sgi.com/tech/stl/accumulate.html</a></p>

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