How to parse a string to an int in C++? (17个答案)
4年前关闭。
在过去的两个星期中，我一直在尝试使用
windows.h 库(为了简单使用GUI)来编写程序。我设法制作了一个可以写入的文本框，但是我的问题是您只能将数据引入为
char * 。该程序使我的 worker 能够更轻松，更快地计算一些公式。如何将char转换为int，而又不会遇到ASCII码的麻烦？
*我也尝试过使用字符串。这是我的实际代码:
#if defined(UNICODE) && !defined(_UNICODE)
#define _UNICODE
#elif defined(_UNICODE) && !defined(UNICODE)
#define UNICODE
#endif
#include <tchar.h>
#include <windows.h>
#include <string>
using namespace std;
/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
HWND textstatic,texteditz1,texteditz2,textedit2,buttoncalculate,button2;
/* Make the class name into a global variable */
string inputZ1,inputZ2;
char *cinputZ1 = &inputZ1[0u];
TCHAR szClassName[ ] = _T("CodeBlocksWindowsApp");
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nCmdShow)
{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default colour as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
_T("Code::Blocks Template Windows App"), /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
500, /* The programs width */
500, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_CREATE:
texteditz1 = CreateWindow ("EDIT","",
WS_VISIBLE | WS_CHILD,
60,50,45,14,
hwnd, (HMENU) 4,NULL,NULL);
texteditz2 = CreateWindow ("EDIT","",
WS_VISIBLE | WS_CHILD,
60,30,45,14,
hwnd, (HMENU) 5 ,NULL , NULL);
textstatic = CreateWindow ("STATIC",
"Z2=",
WS_VISIBLE | WS_CHILD,
30,50,30,15,
hwnd, NULL, NULL, NULL);
textstatic = CreateWindow ("STATIC",
"Z1=",
WS_VISIBLE | WS_CHILD,
30,30,30,15,
hwnd, NULL, NULL, NULL);
textstatic = CreateWindow ("STATIC",
"x1min=",
WS_VISIBLE | WS_CHILD,
30,70,50,15,
hwnd, NULL, NULL, NULL);
buttoncalculate = CreateWindow ("BUTTON",
"Calculate",
WS_VISIBLE | WS_CHILD,
150, 300, 70, 15,
hwnd, (HMENU) 1, NULL, NULL);
button2 = CreateWindow ("BUTTON","apasa",
WS_VISIBLE | WS_CHILD,
300, 300, 70, 15,
hwnd, (HMENU) 2, NULL, NULL);
break;
case WM_COMMAND:
switch (LOWORD(wParam))
{
case 1:
{
int text=0 ,text2=0 ;
text=GetWindowText(texteditz1,inputZ1,5);
text2=GetWindowText(texteditz2,inputZ2,5);
::MessageBox(hwnd, inputZ1, "Button",MB_OK);
::MessageBox(hwnd, inputZ2, "Text2",MB_OK);
}
break;
case 2:
::MessageBox (hwnd, "251", "button",NULL);
break;
}
break;
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}