我有一个带有用户名和密码文本框的小窗口，用于显示输出的锁定文本框和用于登录的按钮。登录过程运行良好。
成功登录后，我需要将窗口更改为用户名和密码的两个文本框消失，被锁定或暂时删除，以更简单者为准。我还需要在成功登录后将按钮上的文本更改为“注销”而不是登录。在从按钮中选择操作之前，我已经可以通过检查登录布尔值来更改按钮的功能，但我不知道如何更改其上的文本。或者用不同的按钮替换它。我搜索了诸如切换可见性、删除文本框/窗口之类的东西。我似乎找不到任何东西。如果我可以删除它们并触发另一个 WM_CREATE 实例，那么在这种情况下，我可以在登录后进行第二个布局，但是我不知道如何删除，也许这不是正常的做法。回答我的问题或提出不同的方法也可以。谢谢
我的代码：
#include "StdAfx.h"
#include "Resource.h"
#include <windows.h>
#include <string>
#define IDC_MAIN_BUTTON 101 // Button identifier
#define IDC_MAIN_EDIT 102 // Edit box identifier
HWND hEdit, hEdit2, noEdit;
bool loggedin = false;
LRESULT CALLBACK WinProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInst,HINSTANCE hPrevInst,LPSTR lpCmdLine,int nShowCmd)
{
WNDCLASSEX wClass;
ZeroMemory(&wClass,sizeof(WNDCLASSEX));
wClass.cbClsExtra=NULL;
wClass.cbSize=sizeof(WNDCLASSEX);
wClass.cbWndExtra=NULL;
wClass.hbrBackground=(HBRUSH)COLOR_WINDOW;
wClass.hCursor=LoadCursor(NULL,IDC_ARROW);
wClass.hIcon=NULL;
wClass.hIconSm=NULL;
wClass.hInstance=hInst;
wClass.lpfnWndProc=(WNDPROC)WinProc;
wClass.lpszClassName="Window Class";
wClass.lpszMenuName=NULL;
wClass.style=CS_HREDRAW|CS_VREDRAW;
if(!RegisterClassEx(&wClass))
{
int nResult=GetLastError();
MessageBox(NULL,
"Window class creation failed\r\n",
"Window Class Failed",
MB_ICONERROR);
}
HWND hWnd=CreateWindowEx(NULL,
"Window Class",
"Windows application",
WS_OVERLAPPEDWINDOW,
200,
200,
300,
200,
NULL,
NULL,
hInst,
NULL);
if(!hWnd)
{
int nResult=GetLastError();
MessageBox(NULL,
"Window creation failed\r\n",
"Window Creation Failed",
MB_ICONERROR);
}
ShowWindow(hWnd,nShowCmd);
MSG msg;
ZeroMemory(&msg,sizeof(MSG));
connect();
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WinProc(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
{
// Create an edit box
hEdit=CreateWindowEx(WS_EX_CLIENTEDGE,
"EDIT",
"",
WS_CHILD|WS_VISIBLE|
ES_MULTILINE|ES_AUTOVSCROLL|ES_AUTOHSCROLL,
50,
70,
200,
25,
hWnd,
(HMENU)IDC_MAIN_EDIT,
GetModuleHandle(NULL),
NULL);
hEdit2=CreateWindowEx(WS_EX_CLIENTEDGE,
"EDIT",
"",
WS_CHILD|WS_VISIBLE|
ES_MULTILINE|ES_AUTOVSCROLL|ES_AUTOHSCROLL,
50,
95,
200,
25,
hWnd,
(HMENU)IDC_MAIN_EDIT,
GetModuleHandle(NULL),
NULL);
noEdit=CreateWindowEx(WS_EX_CLIENTEDGE,
"EDIT",
"",
WS_CHILD|WS_VISIBLE|ES_READONLY|
ES_MULTILINE|ES_AUTOVSCROLL|ES_AUTOHSCROLL,
50,
20,
200,
50,
hWnd,
(HMENU)IDC_MAIN_EDIT,
GetModuleHandle(NULL),
NULL);
HGDIOBJ hfDefault=GetStockObject(DEFAULT_GUI_FONT);
SendMessage(hEdit,
WM_SETFONT,
(WPARAM)hfDefault,
MAKELPARAM(FALSE,0));
SendMessage(hEdit2,
WM_SETFONT,
(WPARAM)hfDefault,
MAKELPARAM(FALSE,0));
SendMessage(noEdit,
WM_SETFONT,
(WPARAM)hfDefault,
MAKELPARAM(FALSE,0));
SendMessage(hEdit,
WM_SETTEXT,
NULL,
(LPARAM)"Nolan");
SendMessage(hEdit2,
WM_SETTEXT,
NULL,
(LPARAM)"password");
// Create a push button
HWND hWndButton=CreateWindowEx(NULL,
"BUTTON",
"Login",
WS_TABSTOP|WS_VISIBLE|
WS_CHILD|BS_DEFPUSHBUTTON,
50,
120,
100,
24,
hWnd,
(HMENU)IDC_MAIN_BUTTON,
GetModuleHandle(NULL),
NULL);
SendMessage(hWndButton,
WM_SETFONT,
(WPARAM)hfDefault,
MAKELPARAM(FALSE,0));
}
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDC_MAIN_BUTTON:
{
char buffer[256];
SendMessage(hEdit,
WM_GETTEXT,
sizeof(buffer)/sizeof(buffer[0]),
reinterpret_cast<LPARAM>(buffer));
string user(buffer);
SendMessage(hEdit2,
WM_GETTEXT,
sizeof(buffer)/sizeof(buffer[0]),
reinterpret_cast<LPARAM>(buffer));
string pass(buffer);
if(login(user, pass))
{
loggedin = true;
MessageBox(NULL, "You logged in!", "Information", MB_ICONINFORMATION);
}
else
{
loggedin = false;
MessageBox(NULL, "incorrect username or password", "Information", MB_ICONINFORMATION);
}
}
break;
}
break;
case WM_DESTROY:
{
PostQuitMessage(0);
return 0;
}
break;
}
return DefWindowProc(hWnd,msg,wParam,lParam);
}