为CreateDirectory将'const char *'转换为'LPCTSTR' [英] Converting 'const char*' to 'LPCTSTR' for CreateDirectory

问题描述

  #includestdafx.h
 #include< string> 
 #include< windows.h> 
 using namespace std; 
 
 int main（）
 {
 string FilePath =C：\\Documents and Settings\\whatever; 
 CreateDirectory（FilePath，NULL）; 
 return 0; 
} 
  

错误：error C2664：'CreateDirectory'：无法将参数1从'const char *'to'LPCTSTR'

1. 如何进行此转换？


2. 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。这将改变我如何做第1步？


3. 我对数据类型和转换很可怕，5岁的人有很好的解释吗？

解决方案

std :: string 是一个保存 char 的数据的类。要将 std :: string 数据传递给API函数，必须使用 c_str（）方法 char * 指向字符串实际数据的指针。

CreateDirectory $ c>接受 TCHAR * 作为输入。如果定义 UNICODE ， TCHAR 映射到 wchar_t 它映射到 char 。如果你需要坚持使用 std :: string ，但是不想让你的代码 UNICODE CreateDirectoryA（），例如：

  #includestdafx.h 
 #include< string> 
 #include< windows.h> 
 
 int main（）
 {
 std :: string FilePath =C：\\Documents and Settings\\whatever; 
 CreateDirectoryA（FilePath.c_str（），NULL）; 
 return 0; 
} 
  

要使此代码 TCHAR

  #includestdafx.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;但是，基于Ansi的操作系统版本已经死了，现在的一切都是Unicode。  TCHAR 不应在新代码中使用：
  #include stdafx.h
 #include< string> 
 #include< windows.h> 
 
 int main（）
 {
 std :: wstring FilePath = LC：\\Documents and Settings\\whatever; 
 createDirectoryW（FilePath.c_str（），NULL）; 
 return 0; 
} 
  
 
#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'

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? 

解决方案
std::string is a class that holds char-based data.  To pass a std::string data to API functions, you have to use its c_str() method to get a char* pointer to the string's actual data.

CreateDirectory() takes a TCHAR* as input.  If UNICODE is defined, TCHAR maps to wchar_t, otherwise it maps to char instead.  If you need to stick with std::string but do not want to make your code UNICODE-aware, then use CreateDirectoryA() instead, eg:
#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:
#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.  TCHAR should not be used in new code anymore:
#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;
}


                        
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