wcscat_s函数-缓冲区错误 [英] wcscat_s function - buffer error
本文介绍了wcscat_s函数-缓冲区错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
问题很简单:这段代码有什么用?
The question is simple: what's frong with this piece of code?
size_t buff = 1;
size_t new_buff;
WCHAR *var_path;
WCHAR *dir_path;
var_path = new WCHAR[buff];
new_buff = GetEnvironmentVariableW(L"APPDATA", var_path, buff);
if (new_buff == 0) {
return 1;
} else if (new_buff > buff) {
delete[] var_path;
var_path = new WCHAR[new_buff];
GetEnvironmentVariableW(L"APPDATA", var_path, new_buff);
}
dir_path = new WCHAR[new_buff];
wcscpy_s(dir_path, new_buff, var_path);
wcscat_s(dir_path, new_buff, L"\\directory");
它表示wcscat_s
推荐答案
您只为dir_path分配了new_buff个字符(并告诉wcscat_s该大小)，然后您希望在其后附加更多字符.您需要分配new_buff plus 的长度L"\\directory"，并告知wcscat_s该实际大小.
You only allocate new_buff characters for dir_path (and tell wcscat_s about that size), then you want to append more characters to it. You need to allocate new_buff plus the length of L"\\directory", as well as tell wcscat_s about that actual size.
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