C++ 无法在参数传递中将“const char*”转换为“WCHAR*”
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Cannot convert 'const char*' to 'WCHAR*' in argument passing
提问by DTDest
I have documentation where written that username, IP and password must be const char*and when I'm putting varaibles in const char, I'm getting this error message.
我有文档说明用户名、IP 和密码必须是const char*，当我将变量放入const char.
This is my code:
这是我的代码：
#include <cstdlib>
#include <iostream>
#include <stdio.h>
#include <windows.h>
using namespace std;
typedef int (__cdecl *MYPROC)(LPWSTR);
int main()
{
HINSTANCE hinstDLL;
MYPROC ProcAdd;
hinstDLL = LoadLibrary("LmServerAPI.dll");
if(hinstDLL != NULL){
ProcAdd = (MYPROC) GetProcAddress(hinstDLL,"LmServer_Login");
if(ProcAdd != NULL){
const char* IP = "xxx.177.xxx.23";
const char* name = "username";
const char* pass = "password";
int port = 888;
ProcAdd(IP,port,name,pass);
system ("pause");
}
}
}
And I got this error:
我收到了这个错误：
cannot convert
const char*' toWCHAR*' in argument passing
无法
const char*' to在参数传递中转换WCHAR*'
Which kind of variable must I use for those arguments and how?
对于这些参数，我必须使用哪种变量以及如何使用？
回答by the swine
You are most likely using one of the Visual Studio compilers, where in Project Settings, there is a Character setchoice. Choose from:
您最有可能使用的是其中一种 Visual Studio 编译器，其中Project Settings有一个Character set选项。从中选择：
- Unicode character set (UTF-16), default
- Multi-Byte character set (UTF-8)
- Not Set
- Unicode 字符集 (UTF-16)，默认
- 多字节字符集 (UTF-8)
- 没有设置
Calling functions that accept strings in the Unicode setting requires you to make Unicode string literals:
调用接受 Unicode 设置中的字符串的函数需要您制作 Unicode 字符串文字：
"hello"
Is of type const char*, whereas:
是 类型const char*，而：
L"hello"
is of type const wchar_t*. So either change your configuration to Not setor change your string literals to wide ones.
是 类型const wchar_t*。因此，要么将您的配置更改为Not set或将您的字符串文字更改为宽字符串。
回答by Alexis Wilke
For literals, you want to use Lon the string as in:
对于文字，您希望L在字符串上使用：
L"My String"
If you may compile in wide character or not, then you may want to consider using the _T()macro instead:
如果您可以编译宽字符，那么您可能需要考虑使用_T()宏：
_T("My String")
Wide string characters under MS-Windows make use of the UTF-16 format. For more information about Unicode formats, look on the Unicode website.
MS-Windows 下的宽字符串字符使用 UTF-16 格式。有关 Unicode 格式的更多信息，请查看Unicode 网站。
To dynamically convert a string, you need to know the format of your char *string. In most cases, under Windows it is a Win1252, but definitively not always. Microsoft Windows supports many 8 bit formats, including UTF-8 and ISO-8859-1.
要动态转换字符串，您需要知道char *字符串的格式。在大多数情况下，在 Windows 下它是 Win1252，但并非总是如此。Microsoft Windows 支持许多 8 位格式，包括 UTF-8 和 ISO-8859-1。
If you trust the locale setup, you could use the mbstowc_s()functions.
如果您信任区域设置，则可以使用这些mbstowc_s()功能。
For other conversions, you may want to look at the MultiByteToWideChar()function
对于其他转换，您可能需要查看MultiByteToWideChar()函数
