blocks|key|3686377|text|看看strcat和wcscat吧。不能使用char数组添加char指针。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3686378|如果你在windows机器上，你可以使用_tcscat，它会根据_UNICODE和_MBCS的定义重定向到要使用的正确函数。|style|CODE|3686379|可能还希望通过将_s附加到函数名来使用安全版本。|3686380|正如评论中指出的，您也可以使用snprintf，如下所示：|3686381|const+size_t+concatenated_size+=+256;
char+concatenated[concatenated_size];

snprintf(concatenated,+concatenated_size,+"C:\\Users\\%25s\\AppData",+username);|code-block|syntax|javascript|3686382|由于在运行时字符串之前和之后都有字符串文字，因此这可能是一种更好的方法。|3686383|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cplusplus.com/reference/cstring/strcat/|1|http://www.cplusplus.com/reference/cwchar/wcscat/^0|2|6|0|9|6|1|0|K|7|W|8|15|5|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]|$A|16|B|17|1|18]]|C|$]]|$1|D|3|E|5|6|7|19|8|@$A|1A|B|1B|F|G]|$A|1C|B|1D|F|G]|$A|1E|B|1F|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|1G|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|1H|8|@]|9|@]|C|$]]|$1|L|3|M|5|N|7|1I|8|@]|9|@]|C|$O|P]]|$1|Q|3|R|5|6|7|1J|8|@]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1K|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]|10|$5|V|W|X|C|$Y|11]]]]

Have a look at <a href="http://www.cplusplus.com/reference/cstring/strcat/" rel="noreferrer">strcat</a> and <a href="http://www.cplusplus.com/reference/cwchar/wcscat/" rel="noreferrer">wcscat</a>. You can't add char pointer with char array.

If you are on a windows machine, you can use <code>_tcscat</code> which will redirect to the right function to use depending on <code>_UNICODE</code> and <code>_MBCS</code> defines.

Might want to use the safe versions as well by appending _s to the function name.

 
As pointed in the comments, you can also use snprintf like so:

<pre><code>const size_t concatenated_size = 256;
char concatenated[concatenated_size];

snprintf(concatenated, concatenated_size, "C:\\Users\\%s\\AppData", username);
</code></pre>

Since you have string literals before and after the runtime string, it is probably a better approach.

blocks|key|3686402|text|回答标题中的问题:使用_tcscat函数连接两个TCHAR字符串。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3686403|但是，在您的代码中还存在与此相关的其他问题：GetUserName需要一个LPTSTR，即指向缓冲区TCHAR字符的指针。此外，还有另一个TCHAR用法|3686404|TCHAR*+appdatapath+="C:\\Users\\"%2Busername%2B"\\AppData";|code-block|syntax|javascript|3686405|这样做的问题是，根据是否定义了_UNICODE，TCHAR扩展到的类型会发生变化。特别是，如果您设置了它，TCHAR+(最终)会扩展为wchar，因此GetUserName需要一个wchar_t*，但您需要传递一个char*。另一个问题是不能使用%2B运算符连接C数组。|3686406|我建议从一开始就不要再担心TCHAR了，总是只使用定义的_UNICODE进行编译--并且在整个代码中都使用wchar。另外，由于您使用的是C%2B%2B，因此只需使用std::wstring：|3686407|wchar+username[UNLEN%2B1];
DWORD+username_len+=+UNLEN%2B1;
GetUserNameW(username,+&username_len);
std::wstring+appdatapath+=+L"C:\\Users\\";
appdatapath+%2B=+username;
appdatapath+%2B=+L"\\AppData";|3686408|最后但并非最不重要的一点是:您的整个代码可能都可以替换为对SHGetSpecialFolderPath函数的调用-将CSIDL_APPDATA传递给它以获得"AppData“路径。|3686409|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/aa272954%2528v=vs.60%2529.aspx|1|http://msdn.microsoft.com/en-us/library/windows/desktop/ms724432%2528v=vs.85%2529.aspx|2|http://msdn.microsoft.com/en-us/library/windows/desktop/bb762204%2528v=vs.85%2529.aspx^0|B|7|O|5|B|7|0|0|M|B|11|6|1E|5|1X|5|M|B|1|0|0|F|8|O|5|1H|5|1V|5|23|B|2I|8|2Z|5|3F|1|0|D|5|S|8|1H|5|27|C|0|0|T|M|1M|D|T|M|2|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@$9|1B|A|1C|1|1D]]|E|$]]|$1|F|3|G|5|6|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]]|D|@$9|1N|A|1O|1|1P]]|E|$]]|$1|H|3|I|5|J|7|1Q|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1R|8|@$9|1S|A|1T|B|C]|$9|1U|A|1V|B|C]|$9|1W|A|1X|B|C]|$9|1Y|A|1Z|B|C]|$9|20|A|21|B|C]|$9|22|A|23|B|C]|$9|24|A|25|B|C]|$9|26|A|27|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|28|8|@$9|29|A|2A|B|C]|$9|2B|A|2C|B|C]|$9|2D|A|2E|B|C]|$9|2F|A|2G|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|J|7|2H|8|@]|D|@]|E|$K|L]]|$1|S|3|T|5|6|7|2I|8|@$9|2J|A|2K|B|C]|$9|2L|A|2M|B|C]]|D|@$9|2N|A|2O|1|2P]]|E|$]]|$1|U|3|-4|5|6|7|2Q|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]|12|$5|X|Y|Z|E|$10|13]]|14|$5|X|Y|Z|E|$10|15]]]]

To answer the question in the title: you concatenate two <code>TCHAR</code> strings using the <a href="http://msdn.microsoft.com/en-us/library/aa272954%28v=vs.60%29.aspx" rel="nofollow"><code>_tcscat</code></a> function.

However, there are other issues in your code related to this: <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms724432%28v=vs.85%29.aspx" rel="nofollow"><code>GetUserName</code></a> expects a <code>LPTSTR</code>, i.e. a pointer to a buffer <code>TCHAR</code> characters. Furthermore, there's another <code>TCHAR</code> usage in

<pre><code>TCHAR* appdatapath ="C:\\Users\\"+username+"\\AppData";
</code></pre>

The issue with this is that the type to which <code>TCHAR</code> expands changes depending on whether <code>_UNICODE</code> is defined. In particular, if you set it, <code>TCHAR</code> (eventually) expands to <code>wchar</code> and hence <code>GetUserName</code> expects a <code>wchar_t*</code> but you pass a <code>char*</code>. Another issue is that you cannot concatenate C arrays using the <code>+</code> operator.

I suggest to stop worrying about <code>TCHAR</code> in the first place and always just compile with <code>_UNICODE</code> defined - and use <code>wchar</code> throughout your code. Also, since you're using C++, just use <code>std::wstring</code>: 

<pre><code>wchar username[UNLEN+1];
DWORD username_len = UNLEN+1;
GetUserNameW(username, &amp;username_len);
std::wstring appdatapath = L"C:\\Users\\";
appdatapath += username;
appdatapath += L"\\AppData";
</code></pre>

Last but not least: your entire code can probably be replaced with a call to the <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/bb762204%28v=vs.85%29.aspx" rel="nofollow"><code>SHGetSpecialFolderPath</code></a> function - pass <code>CSIDL_APPDATA</code> to it to get the "AppData" path.

blocks|key|206904|text|#include+<tchar.h>

const+size_t+stringSize=+20;
TCHAR+value[stringSize]+=+{+0+};

_tcscat_s(value,+stringSize,+TEXT("appendMe"));|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|206905|MSDN：_tcscat_s|unstyled|offset|length|206906|entityMap|0|LINK|mutability|MUTABLE|url|https://msdn.microsoft.com/de-de/library/d45bbxx4.aspx^0|0|5|9|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code>#include &lt;tchar.h&gt;

const size_t stringSize= 20;
TCHAR value[stringSize] = { 0 };

_tcscat_s(value, stringSize, TEXT("appendMe"));
</code></pre>

MSDN: <a href="https://msdn.microsoft.com/de-de/library/d45bbxx4.aspx" rel="nofollow noreferrer">_tcscat_s</a>

I'm trying to combine 2 tchar.

<pre><code>char username[UNLEN+1];
DWORD username_len = UNLEN+1;
GetUserName(username, &amp;username_len);
TCHAR* appdatapath ="C:\\Users\\"+username+"\\AppData";
</code></pre>

But I get error error at appdatapath line. How can I combine 2 tchar? Thanks

C++ Combine 2 Tchar

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试将2个字符组合在一起。char username[UNLEN+1];DWORD username_len = UNLEN+1;GetUserName(username, &username_len);TCHAR* appdatapath ="C:\\Users\\"+username+"\\AppData";...

问C++合并2个任务
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