如何在Win32 C ++中将类型“int”转换为“LPCSTR”类型

Question

Hello friends how can I convert type "int" to type "LPCSTR"? I want to give the variable "int cxClient" to the "MessageBox" function's second parameter "LPCSTR lpText". Following is the sample code:

int cxClient;    
cxClient = LOWORD (lParam);    
MessageBox(hwnd, cxClient, "Testing", MB_OK);

But it does not work. The following function is the method signature of the "MessageBox" function:

MessageBox(HWND hWnd, LPCSTR lpText, LPCSTR lpCaption, UINT uType);

Answer 1

Convert the int to a string by using the right sprintf variant

TCHAR buf[100];
_stprintf(buf, _T("%d"), cxClient);
MessageBox(hwnd, buf, "Testing", MB_OK);

you need <tchar.h> .

I think _stprintf is the quick answer here - but if you want to go pure C++ like David suggests, then

#ifdef _UNICODE
wostringstream oss;
#else
ostringstream oss;
#endif

oss<<cxClient;

MessageBox(0, oss.str().c_str(), "Testing", MB_OK);

You need

#include <sstream>
using namespace std;

Answer 2

using std::to_string

std::string message = std::to_string(cxClient)

http://en.cppreference.com/w/cpp/string/basic_string/to_string