C++ WinAPI: dynamic message box text?

[pipnina]

        MessageBox(NULL,
                   L"Failed to create application window\n" + (char)GetLastError(),
                   L"ERROR",
                   NULL);

This outputs "lication window". I have tried other methods of dynamically deciding the message box's text such as using a string (which is didn't like) and building the text outside the MessageBox() function. Not sure what to try now.

 

 

[jubjub]

Have you tried using a c string?

 

Edit: You have to change character set to Multi Byte, I always use that setting so forgot about it

[fizzlesticks]

Use a wstring then pass the message box the c_str. 

    wstring str = L"Message "s + to_wstring(GetLastError());
    wstring cap = L"Title"s;

    auto ret = MessageBox(nullptr, str.c_str(), cap.c_str(), MB_OKCANCEL);

 

[pipnina]

21 minutes ago, fizzlesticks said:

Use a wstring then pass the message box the c_str. 

    wstring str = L"Message " + to_wstring(GetLastError());
    wstring cap = L"Title";

    auto ret = MessageBox(nullptr, str.c_str(), cap.c_str(), MB_OKCANCEL);

 

to_wstring (and consequently to_string) don't seem to be in the MinGW installation on my machine.  I'll need to try and sort that.

Thanks for the help, though.  

[fizzlesticks]

2 minutes ago, pipnina said:

to_wstring (and consequently to_string) don't seem to be in the MinGW installation on my machine.  I'll need to try and sort that.

Thanks for the help, though.  

They were added in C++11, you'll need to add the --std=c++11 option when compiling or upgrade if it doesn't support it.

[pipnina]

Just now, fizzlesticks said:

They were added in C++11, you'll need to add the --std=c++11 option when compiling or upgrade if it doesn't support it.

I've installed the most recent 64-bit version of MinGW and linked it in Code::Blocks. I compiled the program with 

wstring msg = L"Failed to create application window\n" + to_wstring());

And now it works as intended. Clearly the 32-bit version of MinGW didn't fully support C++11 features.

 

Thank you  

[SCHISCHKA]

I'm looking at MSDN

https://msdn.microsoft.com/en-us/library/windows/desktop/ms645505(v=vs.85).aspx

I'm thinking you might need to put brackets around the string concatenation to cast it to LPCWSTR