[英]How do I convert a CString to a BYTE?
I have CStrings in my program that contain BYTE information like the following: 我的程序中有CStrings,其中包含BYTE信息,如下所示:
L"0x45"
I want to turn this into a BYTE type with value 0x45
. 我想将其转换为值为
0x45
的BYTE类型。 How do I do this? 我该怎么做呢? All examples I can find are trying to get the literal byte value of the string itself, but I want to take the value contained within the CString and convert THAT to a BYTE.
我可以找到的所有示例都试图获取字符串本身的字面值,但是我想获取CString中包含的值并将THAT转换为BYTE。 How do I achieve this?
我该如何实现?
You can use the wcstoul()
conversion function, specifying base 16. 您可以使用
wcstoul()
转换函数,指定基数为16。
eg: 例如:
#define UNICODE
#define _UNICODE
#include <stdlib.h> // for wcstoul()
#include <iostream> // for console output
#include <atlstr.h> // for CString
int main()
{
CString str = L"0x45";
static const int kBase = 16; // Convert using base 16 (hex)
unsigned long ul = wcstoul(str, nullptr, kBase);
BYTE b = static_cast<BYTE>(ul);
std::cout << static_cast<unsigned long>(b) << std::endl;
}
C:\\Temp>cl /EHsc /W4 /nologo test.cpp
Output: 输出:
69
As an alternative, you can also consider using new C++11's std::stoi()
: 或者,您也可以考虑使用新的C ++ 11的
std::stoi()
:
#define UNICODE
#define _UNICODE
#include <iostream> // for console output
#include <string> // for std::stoi()
#include <atlstr.h> // for CString
int main()
{
CString str = L"0x45";
static const int kBase = 16; // Convert using base 16 (hex)
int n = std::stoi(str.GetString(), nullptr, kBase);
BYTE b = static_cast<BYTE>(n);
std::cout << static_cast<unsigned long>(b) << std::endl;
}
NOTE 注意
In this case, since std::stoi()
expects a const std::wstring&
argument, you must explicitly get the const wchar_t*
pointer for the CString
instance, either using CString::GetString()
as I did (and I prefer), or using static_cast<const wchar_t*>(str)
. 在这种情况下,由于
std::stoi()
需要一个const std::wstring&
参数,因此您必须像我一样(并且我更喜欢使用CString::GetString()
显式获取CString
实例的const wchar_t*
指针。 ,或使用static_cast<const wchar_t*>(str)
。
Then, a temporary std::wstring
will be built to be passed to std::stoi()
for the conversion. 然后,将构建一个临时的
std::wstring
传递给std::stoi()
进行转换。
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