C++ 十进制数字的区域设置感知编辑控件子类化(格式[符号][xxx…][十进制分隔符][yy…]) 导言和有关资料:
我有一个C++ 十进制数字的区域设置感知编辑控件子类化(格式[符号][xxx…][十进制分隔符][yy…]) 导言和有关资料:,c++,winapi,locale,subclassing,editcontrol,C++,Winapi,Locale,Subclassing,Editcontrol,我有一个编辑控件,它应该只接受有符号的十进制数,比如-123.456。另外,它应该是地区识别的,因为十进制分隔符在美国的每个国家都不相同,所以使用点,而在欧洲是逗号等等 我为解决这个问题所做的努力: 到目前为止,我已经使用了子类化来实现这一点。下面是我实现子类化的逻辑,通过伪代码表示: if ( ( character is not a [ digit,separator, or CTRL/Shift... ] OR ( char is separator and we already
编辑控件
,它应该只接受有符号的十进制数,比如-123.456
。另外,它应该是地区识别的,因为十进制分隔符在美国的每个国家都不相同,所以使用点,而在欧洲是逗号等等
我为解决这个问题所做的努力:
到目前为止,我已经使用了子类化来实现这一点。下面是我实现子类化的逻辑,通过伪代码表示:
if ( ( character is not a [ digit,separator, or CTRL/Shift... ] OR
( char is separator and we already have one ) )
{
discard the character;
}
首先,我创建了一个helper函数,用于确定char数组是否已经具有十进制分隔符,如下所示:
bool HasDecimalSeparator( wchar_t *test )
{
// get the decimal separator
wchar_t szBuffer[5];
GetLocaleInfo ( LOCALE_USER_DEFAULT,
LOCALE_SDECIMAL,
szBuffer,
sizeof(szBuffer) / sizeof(szBuffer[0] ) );
bool p = false; // text already has decimal separator?
size_t i = 0; // needed for while loop-iterator
// go through entire array and calculate the value of the p
while( !( p = ( test[i] == szBuffer[0] ) ) && ( i++ < wcslen(test) ) );
return p;
}
一个重要的注意事项是:我能够在我的应用程序中加载当前的用户区域设置,这要感谢对的回答
问题:
有没有更好的方法来实现只接受带符号的十进制数并具有区域设置意识的编辑控件
如果subclass
ing是唯一的方法,那么我的代码可以进一步改进/优化吗
谢谢你的时间和帮助
致以最良好的祝愿
附件:
为了进一步帮助您,这里有一个小的演示应用程序,它创建了一个编辑控件,并且子类将其设置为只接受十进制数-,我还没有实现负号部分:
LRESULT CALLBACK Decimalni( HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam,
UINT_PTR uIdSubclass,
DWORD_PTR dwRefData )
{
switch (message)
{
case WM_CHAR:
{
// get decimal separator
wchar_t szBuffer[5];
GetLocaleInfo ( LOCALE_USER_DEFAULT,
LOCALE_SDECIMAL,
szBuffer,
sizeof(szBuffer) / sizeof(szBuffer[0] ) );
wchar_t t[50]; // here we store edit control's current text
memset( &t, L'\0', sizeof(t) );
// get edit control's current text
GetWindowText( hwnd, t, 50 );
// if ( ( is Not a ( digit,separator, or CTRL/Shift... )
// || ( char is separator and we already have one ) )
// discard the character
if( ( !( isdigit(wParam) || ( wParam == szBuffer[0] ) )
&& ( wParam >= L' ' ) ) // digit/separator/... ?
|| ( HasDecimalSeparator(t) // has separator?
&& ( wParam == szBuffer[0] ) ) )
{
return 0;
}
}
break;
}
return DefSubclassProc( hwnd, message, wParam, lParam);
}
#include <windows.h>
#include <commctrl.h>
#include <stdlib.h>
#include <locale.h>
#pragma comment( lib, "comctl32.lib")
const wchar_t g_szClassName[] = L"myWindowClass";
bool HasDecimalSeparator( wchar_t *test )
{
// get the decimal separator
wchar_t szBuffer[5];
GetLocaleInfo ( LOCALE_USER_DEFAULT,
LOCALE_SDECIMAL,
szBuffer,
sizeof(szBuffer) / sizeof(szBuffer[0] ) );
bool p = false; // text already has decimal separator?
size_t i = 0; // needed for while loop-iterator
// go through entire array and calculate the value of the p
while( !( p = ( test[i] == szBuffer[0] ) ) && ( i++ < wcslen(test) ) );
return p;
}
LRESULT CALLBACK Decimalni( HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam,
UINT_PTR uIdSubclass,
DWORD_PTR dwRefData )
{
switch (message)
{
case WM_CHAR:
{
// get decimal separator
wchar_t szBuffer[5];
GetLocaleInfo ( LOCALE_USER_DEFAULT,
LOCALE_SDECIMAL,
szBuffer,
sizeof(szBuffer) / sizeof(szBuffer[0] ) );
wchar_t t[50]; // here we store edit control's current text
memset( &t, L'\0', sizeof(t) );
// get edit control's current text
GetWindowText( hwnd, t, 50 );
// if ( ( is Not a ( digit,separator, or CTRL/Shift... )
// || ( char is separator and we already have one ) )
// discard the character
if( ( !( isdigit(wParam) || ( wParam == szBuffer[0] ) )
&& ( wParam >= L' ' ) ) // digit/separator/... ?
|| ( HasDecimalSeparator(t) // has separator?
&& ( wParam == szBuffer[0] ) ) )
{
return 0;
}
}
break;
}
return DefSubclassProc( hwnd, message, wParam, lParam);
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
{
/************* load current locale settings *************/
// max. len: language, country, code page
wchar_t lpszLocale[64+64+16+3] = L"";
wchar_t lpszVal[128];
LCID nLCID = ::GetUserDefaultLCID(); // current LCID for user
if ( ::GetLocaleInfo( nLCID, LOCALE_SENGLANGUAGE, lpszVal, 128 ) )
{
wcscat_s( lpszLocale, 147, lpszVal ); // language
if ( ::GetLocaleInfo( nLCID, LOCALE_SENGCOUNTRY, lpszVal, 128 ) )
{
wcscat_s( lpszLocale, 147, L"_" ); // append country/region
wcscat_s( lpszLocale, 147, lpszVal );
if ( ::GetLocaleInfo( nLCID,
LOCALE_IDEFAULTANSICODEPAGE, lpszVal, 128 ) )
{
// missing code page or page number 0 is no error
// (e.g. with Unicode)
int nCPNum = _wtoi(lpszVal);
if (nCPNum >= 10)
{
wcscat_s( lpszLocale, 147, L"." ); // append code page
wcscat_s( lpszLocale, 147, lpszVal );
}
}
}
}
// set locale and LCID
_wsetlocale( LC_ALL, lpszLocale );
::SetThreadLocale(nLCID);
/*************************************************/
HWND hEdit1;
hEdit1 = CreateWindowEx(0, L"EDIT", L"",
WS_BORDER | WS_CHILD | WS_VISIBLE | ES_AUTOVSCROLL | ES_AUTOHSCROLL,
50, 100, 100, 20,
hwnd, (HMENU)8001, GetModuleHandle(NULL), NULL);
SetWindowSubclass( hEdit1, Decimalni, 0, 0);
}
break;
case WM_SETTINGCHANGE:
if( !wParam && !wcscmp( (wchar_t*)lParam, L"intl" ) )
{
// max. len: language, country, code page
wchar_t lpszLocale[64+64+16+3] = L"";
wchar_t lpszVal[128];
LCID nLCID = ::GetUserDefaultLCID(); // current LCID for user
if ( ::GetLocaleInfo( nLCID, LOCALE_SENGLANGUAGE, lpszVal, 128 ) )
{
wcscat_s( lpszLocale, 147, lpszVal ); // language
if ( ::GetLocaleInfo( nLCID, LOCALE_SENGCOUNTRY, lpszVal, 128 ) )
{
wcscat_s( lpszLocale, 147, L"_" ); // append country/region
wcscat_s( lpszLocale, 147, lpszVal );
if ( ::GetLocaleInfo( nLCID,
LOCALE_IDEFAULTANSICODEPAGE, lpszVal, 128 ) )
{
// missing code page or page number 0 is no error
// (e.g. with Unicode)
int nCPNum = _wtoi(lpszVal);
if (nCPNum >= 10)
{
wcscat_s( lpszLocale, 147, L"." ); // append code page
wcscat_s( lpszLocale, 147, lpszVal );
}
}
}
}
// set locale and LCID
_wsetlocale( LC_ALL, lpszLocale );
::SetThreadLocale(nLCID);
return 0L;
}
else
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
HWND hwnd;
MSG Msg;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = g_szClassName;
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&wc))
{
MessageBox(NULL, L"Window Registration Failed!", L"Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
hwnd = CreateWindowEx(
0,
g_szClassName,
L"theForger's Tutorial Application",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 480, 320,
NULL, NULL, hInstance, NULL);
if(hwnd == NULL)
{
MessageBox(NULL, L"Window Creation Failed!", L"Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
#包括
#包括
#包括
#包括
#pragma注释(lib,“comctl32.lib”)
const wchar_t g_szClassName[]=L“myWindowClass”;
布尔小数分隔符(wchar\u t*测试)
{
//获取十进制分隔符
wchar_t szBuffer[5];
GetLocaleInfo(语言环境\用户\默认值,
地点,
szBuffer,
sizeof(szBuffer)/sizeof(szBuffer[0]);
bool p=false;//文本已经有小数分隔符了吗?
size\u t i=0;//while循环迭代器需要
//遍历整个数组并计算p的值
而(!(p=(test[i]==szBuffer[0])和&(i++=L“”)//数字/分隔符/?
||(HasDecimalSeparator(t)//has separator?
&&(wParam==szBuffer[0]))
{
返回0;
}
}
打破
}
返回defsublassproc(hwnd、message、wParam、lParam);
}
LRESULT回调WndProc(HWND HWND,UINT msg,WPARAM WPARAM,LPARAM LPARAM)
{
开关(msg)
{
案例WM_创建:
{
/*************加载当前区域设置*************/
//最大长度:语言、国家、代码页
wchar_t lpszLocale[64+64+16+3]=L”“;
wchar_t lpszVal[128];
LCID nLCID=::GetUserDefaultLCID();//用户的当前LCID
if(::GetLocaleInfo(nLCID,LOCALE\u SENGLANGUAGE,lpszVal,128))
{
wcscat_s(lpszLocale,147,lpszVal);//语言
if(::GetLocaleInfo(nLCID,LOCALE\u SENGCOUNTRY,lpszVal,128))
{
wcscat_s(lpszLocale,147,L“”);//附加国家/地区
wcscat_s(LPSZLOCE,147,lpszVal);
如果(::GetLocaleInfo(nLCID,
地点(IDEFAULTANSICODEPAGE,lpszVal,128))
{
//缺少代码页或页码0没有错误
//(例如,使用Unicode)
int nCPNum=_wtoi(lpszVal);
如果(nCPNum>=10)
{
wcscat_s(lpszLocale,147,L“;//附加代码页
wcscat_s(LPSZLOCE,147,lpszVal);
}
}
}
}
//设置区域设置和LCID
_wsetlocale(LC_ALL,lpszLocale);
::SetThreadLocale(nLCID);
/*************************************************/
HWND-hEdit1;
hEdit1=CreateWindowEx(0,L“编辑”,L“,
WS|U BORDER | WS|U CHILD | WS|U VISIBLE | ES|U AUTOVSCROLL | ES|U AUTOHSCROLL,
50, 100, 100, 20,
hwnd,(HMENU)8001,GetModuleHandle(空),空);
SetWindowsSubClass(hEdit1,小数点,0,0);
}
打破
案例WM_设置更改:
如果(!wParam&&!wcscmp((wchar_t*)lParam,L“intl”))
{
//最大长度:语言、国家、代码页
wchar_t lpszLocale[64+64+16+3]=L”“;
wchar_t lpszVal[128];
LCID nLCID=::GetUserDefaultLCID();//用户的当前LCID
if(::GetLocaleInfo(nLCID,LOCALE\u SENGLANGUAGE,lpszVal,128))
{
wcscat_s(lpszLocale,147,lpszVal);//语言
if(::GetLocaleInfo(nLCID,LOCALE\u SENGCOUNTRY,lpszVal,128))
{
wcscat_s(lpszLocale,147,L“”);//附加国家/地区
LRESULT CALLBACK Decimalni( HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData )
{
switch (message)
{
case WM_KEYDOWN:
{
if( wParam == VK_DELETE )
{
DWORD start, end;
int len = GetWindowTextLength(hwnd);
std::wstring buffer( len, 0 );
// get current window text
if( len > 0 )
GetWindowText( hwnd, &buffer[0], len + 1 );
// get current selection
SendMessage( hwnd, EM_GETSEL, (WPARAM)&start, (LPARAM)&end );
if( end > start )
buffer.erase( start, end - start );
else
buffer.erase( start, 1 );
if( buffer.empty() )
return ::DefSubclassProc( hwnd, message, wParam, lParam);
bool IsTextValid = true; // indicates validity of inputed text
// TODO: parse buffer
if( IsTextValid )
return ::DefSubclassProc( hwnd, message, wParam, lParam);
else
{
// TODO: indicate error
return FALSE;
}
}
}
return ::DefSubclassProc( hwnd, message, wParam, lParam);;
break;
case WM_CLEAR:
case WM_CUT:
{
DWORD start, end;
int len = GetWindowTextLength(hwnd);
std::wstring buffer( len, 0 );
// get current window text
if( len > 0 )
GetWindowText( hwnd, &buffer[0], len + 1 );
// get current selection
SendMessage( hwnd, EM_GETSEL, (WPARAM)&start, (LPARAM)&end );
if( end > start )
buffer.erase( start, end - start );
if( buffer.empty() )
return ::DefSubclassProc( hwnd, message, wParam, lParam);
// TODO: parse buffer
bool IsTextValid = true;
if( IsTextValid )
return ::DefSubclassProc( hwnd, message, wParam, lParam);
else
{
// TODO: Indicate error
return FALSE;
}
}
break;
case WM_PASTE:
{
int len = GetWindowTextLength(hwnd);
std::wstring clipboard, wndtxt( len, 0 );
if( len > 0 )
GetWindowText( hwnd, &wndtxt[0], len + 1 );
if( !OpenClipboard(hwnd) )
return FALSE;
HANDLE hClipboardData;
if( hClipboardData = GetClipboardData(CF_UNICODETEXT) )
{
clipboard = (wchar_t*)GlobalLock(hClipboardData);
GlobalUnlock(hClipboardData);
}
CloseClipboard();
if( clipboard.empty() )
return FALSE;
DWORD start, end;
SendMessage( hwnd, EM_GETSEL, (WPARAM)&start, (LPARAM)&end );
// merge strings into one
if( end > start )
wndtxt.replace( start, end - start, clipboard );
else
wndtxt.insert( start, clipboard );
// TODO: parse the text
bool ITextValid = true;
// process the result
if( IsTextValid )
return ::DefSubclassProc( hwnd, message, wParam, lParam);
else
{
// TODO: indicate error
return FALSE;
}
}
break;
case WM_CHAR:
{
DWORD start, end;
int len = GetWindowTextLength(hwnd);
std::wstring buffer( len, 0 );
// get current window text
if( len > 0 )
GetWindowText( hwnd, &buffer[0], len + 1 );
// get current selection
SendMessage( hwnd, EM_GETSEL, (WPARAM)&start, (LPARAM)&end );
// allow copy/paste but leave backspace for special handler
if( ( wParam < 0x020 ) && ( wParam != 0x08 ) )
return ::DefSubclassProc( hwnd, message, wParam, lParam);}
// process backspace
if( wParam == 0x08 )
{
if( end > start )
buffer.erase( start, end - start );
else
if( start > 0 ) // it is safe to move back one place
buffer.erase( start - 1, 1 );
else // start-1 < 0 , can't access buffer[-1] !!
return FALSE;
if( buffer.empty() )
return ::DefSubclassProc( hwnd, message, wParam, lParam);
// TODO: parse buffer
// process the result
if( IsTextValid )
return ::DefSubclassProc( hwnd, message, wParam, lParam);
else
{
//TODO: indicate error
return FALSE;
}
}
// insert character and parse text
if( end > start )
buffer.replace( start, end - start, 1, (wchar_t)wParam );
else
buffer.insert( start, 1, (wchar_t)wParam );
// TODO: parse text
// process the result
if( IsTextValid )
return ::DefSubclassProc( hwnd, message, wParam, lParam);
else
{
//TODO: indicate error
return FALSE;
}
}
break;
case WM_NCDESTROY:
::RemoveWindowSubclass( hwnd, Decimalni, 0 );
break;
}
return ::DefSubclassProc( hwnd, message, wParam, lParam);
}