C++ 为 CreateDirectory 将“const char*”转换为“LPCTSTR”
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Converting 'const char*' to 'LPCTSTR' for CreateDirectory
提问by ProGirlXOXO
#include "stdafx.h"
#include <string>
#include <windows.h>
using namespace std;
int main()
{
string FilePath = "C:\Documents and Settings\whatever";
CreateDirectory(FilePath, NULL);
return 0;
}
Error: error C2664: 'CreateDirectory' : cannot convert parameter 1 from 'const char *' to 'LPCTSTR'
错误：错误 C2664：“CreateDirectory”：无法将参数 1 从“const char *”转换为“LPCTSTR”
- How do I make this conversion?
- The next step is to set today's date as a string or char and concatenate it with the filepath. Will this change how I do step 1?
- I am terrible at data types and conversions, is there a good explanation for 5 year olds out there?
- 我如何进行这种转换？
- 下一步是将今天的日期设置为字符串或字符，并将其与文件路径连接起来。这会改变我做第 1 步的方式吗？
- 我在数据类型和转换方面很糟糕，对 5 岁的孩子有很好的解释吗？
采纳答案by Remy Lebeau
std::stringis a class that holds char-based data. To pass a std::stringdata to API functions, you have to use its c_str()method to get a char*pointer to the string's actual data.
std::string是一个包含char基于数据的类。要将std::string数据传递给 API 函数，您必须使用其c_str()方法来获取char*指向字符串实际数据的指针。
CreateDirectory()takes a TCHAR*as input. If UNICODEis defined, TCHARmaps to wchar_t, otherwise it maps to charinstead. If you need to stick with std::stringbut do not want to make your code UNICODE-aware, then use CreateDirectoryA()instead, eg:
CreateDirectory()将 aTCHAR*作为输入。如果UNICODE已定义，则TCHAR映射到wchar_t，否则映射到char。如果您需要坚持std::string但不想让您的代码UNICODE感知，请CreateDirectoryA()改用，例如：
#include "stdafx.h"
#include <string>
#include <windows.h>
int main()
{
std::string FilePath = "C:\Documents and Settings\whatever";
CreateDirectoryA(FilePath.c_str(), NULL);
return 0;
}
To make this code TCHAR-aware, you can do this instead:
要使此代码TCHAR感知，您可以改为执行以下操作：
#include "stdafx.h"
#include <string>
#include <windows.h>
int main()
{
std::basic_string<TCHAR> FilePath = TEXT("C:\Documents and Settings\whatever");
CreateDirectory(FilePath.c_str(), NULL);
return 0;
}
However, Ansi-based OS versions are long dead, everything is Unicode nowadays. TCHARshould not be used in new code anymore:
然而，基于 Ansi 的操作系统版本早已死了，现在一切都是 Unicode。 TCHAR不应再在新代码中使用：
#include "stdafx.h"
#include <string>
#include <windows.h>
int main()
{
std::wstring FilePath = L"C:\Documents and Settings\whatever";
CreateDirectoryW(FilePath.c_str(), NULL);
return 0;
}
回答by Timo Geusch
If you're not building a Unicode executable, calling c_str()on the std::string will result in a const char*(aka non-Unicode LPCTSTR) that you can pass into CreateDirectory().
如果您没有构建 Unicode 可执行文件，则调用c_str()std::string 将产生一个const char*（又名非 Unicode LPCTSTR），您可以将其传递给CreateDirectory()。
The code would look like this:
代码如下所示：
CreateDirectory(FilePath.c_str(), NULL):
Please note that this will result in a compile error if you're trying to build a Unicode executable.
请注意，如果您尝试构建 Unicode 可执行文件，这将导致编译错误。
If you have to append to FilePathI would recommend that you either continue to use std::stringor use Microsoft's CStringto do the string manipulation as that's less painful that doing it the C way and juggling raw char*. Personally I would use std::stringunless you are already in an MFC application that uses CString.
如果您必须附加到FilePath我建议您继续使用std::string或使用 MicrosoftCString来进行字符串操作，因为这比使用 C 方式进行操作并处理原始字符 * 的痛苦要小。我个人会使用，std::string除非您已经在使用 CString 的 MFC 应用程序中。
