在 MessageBox C++ 中显示变量
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Display a Variable in MessageBox c++
提问by a7md0
How to display a Variable in MessageBox c++ ?
如何在 MessageBox c++ 中显示变量？
string name = "stackoverflow";
MessageBox(hWnd, "name is: <string name here?>", "Msg title", MB_OK | MB_ICONQUESTION);
I want to show it in the following way (#1):
我想以下列方式展示它（#1）：
"name is: stackoverflow"
and this?
和这个？
int id = '3';
MessageBox(hWnd, "id is: <int id here?>", "Msg title", MB_OK | MB_ICONQUESTION);
and I want to show it in the following way (#2):
我想以下列方式展示它（#2）：
id is: 3
how to do this with c++ ?
如何用 C++ 做到这一点？
回答by Gibby
Create a temporary buffer to store your string in and use sprintf, change the formatting depending on your variable type. For your first example the following should work:
创建一个临时缓冲区来存储您的字符串并使用sprintf，根据您的变量类型更改格式。对于您的第一个示例，以下内容应该有效：
char buff[100];
string name = "stackoverflow";
sprintf_s(buff, "name is:%s", name.c_str());
cout << buff;
Then call message box with buff as the string argument
然后以 buff 为字符串参数调用消息框
MessageBox(hWnd, buff, "Msg title", MB_OK | MB_ICONQUESTION);
for an int change to:
对于 int 更改为：
int d = 3;
sprintf_s(buff, "name is:%d",d);
回答by cup
This can be done with a macro
这可以用宏来完成
#define MSGBOX(x) \
{ \
std::ostringstream oss; \
oss << x; \
MessageBox(oss.str().c_str(), "Msg Title", MB_OK | MB_ICONQUESTION); \
}
To use
使用
string x = "fred";
int d = 3;
MSGBOX("In its simplest form");
MSGBOX("String x is " << x);
MSGBOX("Number value is " << d);
Alternatively, you can use varargs (the old fashioned way: not the C++11 way which I haven't got the hang of yet)
或者，您可以使用可变参数（老式方法：不是我尚未掌握的 C++11 方法）
void MsgBox(const char* str, ...)
{
va_list vl;
va_start(vl, str);
char buff[1024]; // May need to be bigger
vsprintf(buff, str, vl);
MessageBox(buff, "MsgTitle", MB_OK | MB_ICONQUESTION);
}
string x = "fred";
int d = 3;
MsgBox("In its simplest form");
MsgBox("String x is %s", x.c_str());
MsgBox("Number value is %d", d);
回答by Gilles Walther
This is the only one that worked for me:
这是唯一对我有用的：
std::string myString = "x = ";
int width = 1024;
myString += std::to_string(width);
LPWSTR ws = new wchar_t[myString.size() + 1];
copy(myString.begin(), myString.end(), ws);
ws[myString.size()] = 0; // zero at the end
MessageBox(NULL, ws, L"Windows Tutorial", MB_ICONEXCLAMATION | MB_OK);
回答by user3148898
Answer to your question:
回答你的问题：
string name = 'stackoverflow';
字符串名称 = 'stackoverflow';
MessageBox("name is: "+name , "Msg title", MB_OK | MB_ICONQUESTION);
MessageBox("name is: "+name , "Msg title", MB_OK | MB_ICONQUESTION);
do in same way for others.
对其他人也一样。
