回答編集履歴
2
nits
test
CHANGED
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@@ -3,9 +3,10 @@
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3
3
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[mbstowcs_s, _mbstowcs_s_l](https://docs.microsoft.com/ja-jp/cpp/c-runtime-library/reference/mbstowcs-s-mbstowcs-s-l?view=msvc-170)
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4
4
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5
5
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```cpp
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6
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-
std::wstring ToWstr(std::string Str)
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6
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+
std::wstring ToWstr(const std::string& Str)
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7
7
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{
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8
8
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const char* cs = Str.c_str();
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9
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+
// wstring の必要サイズを求める
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9
10
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size_t st;
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10
11
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mbstowcs_s(&st, nullptr, 0, cs, Str.length());
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11
12
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1
コード例
test
CHANGED
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@@ -2,3 +2,17 @@
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2
2
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3
3
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[mbstowcs_s, _mbstowcs_s_l](https://docs.microsoft.com/ja-jp/cpp/c-runtime-library/reference/mbstowcs-s-mbstowcs-s-l?view=msvc-170)
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4
4
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5
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+
```cpp
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6
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+
std::wstring ToWstr(std::string Str)
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7
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{
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8
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const char* cs = Str.c_str();
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9
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+
size_t st;
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10
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mbstowcs_s(&st, nullptr, 0, cs, Str.length());
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11
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+
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12
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std::wstring ws(st, 0); // 終端NULを含めたサイズを確保
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13
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mbstowcs_s(&st, &ws[0], st, cs, Str.length());
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14
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ws.resize(st - 1); // 終端NULを捨てる
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15
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return ws;
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16
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+
}
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17
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+
```
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18
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+
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