I was going through a tutorial and had some trouble with an example program. Here's the coding I have and I can't fix it.
Here is the main cpp file.
#include <windows.h>
#include "resource.h"
BOOL CALLBACK DlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
switch(Message)
{
case WM_INITDIALOG:
// This is where we set up the dialog box, and initialise any default values
SetDlgItemText(hwnd, IDC_TEXT, "This is a string");
SetDlgItemInt(hwnd, IDC_NUMBER, 5, FALSE);
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDC_ADD:
{
// When somebody clicks the Add button, first we get the number of
// they entered
BOOL bSuccess;
int nTimes = GetDlgItemInt(hwnd, IDC_NUMBER, &bSuccess, FALSE);
if(bSuccess)
{
// Then we get the string they entered
// First we need to find out how long it is so that we can
// allocate some memory
int len = GetWindowTextLength(GetDlgItem(hwnd, IDC_TEXT));
if(len > 0)
{
// Now we allocate, and get the string into our buffer
int i;
char* buf;
buf = (char*)GlobalAlloc(GPTR, len + 1);
GetDlgItemText(hwnd, IDC_TEXT, buf, len + 1);
// Now we add the string to the list box however many times
// the user asked us to.
for(i = 0;i < nTimes; i++)
{
int index = SendDlgItemMessage(hwnd, IDC_LIST, LB_ADDSTRING, 0, (LPARAM)buf);
// Here we are associating the value nTimes with the item
// just for the heck of it, we'll use it to display later.
// Normally you would put some more useful data here, such
// as a pointer.
SendDlgItemMessage(hwnd, IDC_LIST, LB_SETITEMDATA, (WPARAM)index, (LPARAM)nTimes);
}
// Dont' forget to free the memory!
GlobalFree((HANDLE)buf);
}
else
{
MessageBox(hwnd, "You didn't enter anything!", "Warning", MB_OK);
}
}
else
{
MessageBox(hwnd, "Couldn't translate that number :(", "Warning", MB_OK);
}
}
break;
case IDC_REMOVE:
{
// When the user clicks the Remove button, we first get the number
// of selected items
HWND hList = GetDlgItem(hwnd, IDC_LIST);
int count = SendMessage(hList, LB_GETSELCOUNT, 0, 0);
if(count != LB_ERR)
{
if(count != 0)
{
// And then allocate room to store the list of selected items.
int i;
int *buf = GlobalAlloc(GPTR, sizeof(int) * count);
SendMessage(hList, LB_GETSELITEMS, (WPARAM)count, (LPARAM)buf);
// Now we loop through the list and remove each item that was
// selected.
// WARNING!!!
// We loop backwards, because if we removed items
// from top to bottom, it would change the indexes of the other
// items!!!
for(i = count - 1; i >= 0; i--)
{
SendMessage(hList, LB_DELETESTRING, (WPARAM)buf[i], 0);
}
GlobalFree(buf);
}
else
{
MessageBox(hwnd, "No items selected.", "Warning", MB_OK);
}
}
else
{
MessageBox(hwnd, "Error counting items :(", "Warning", MB_OK);
}
}
break;
case IDC_CLEAR:
SendDlgItemMessage(hwnd, IDC_LIST, LB_RESETCONTENT, 0, 0);
break;
case IDC_LIST:
switch(HIWORD(wParam))
{
case LBN_SELCHANGE:
{
// Get the number of items selected.
HWND hList = GetDlgItem(hwnd, IDC_LIST);
int count = SendMessage(hList, LB_GETSELCOUNT, 0, 0);
if(count != LB_ERR)
{
// We only want to continue if one and only one item is
// selected.
if(count == 1)
{
// Since we know ahead of time we're only getting one
// index, there's no need to allocate an array.
int index;
int err = SendMessage(hList, LB_GETSELITEMS, (WPARAM)1, (LPARAM)&index);
if(err != LB_ERR)
{
// Get the data we associated with the item above
// (the number of times it was added)
int data = SendMessage(hList, LB_GETITEMDATA, (WPARAM)index, 0);
SetDlgItemInt(hwnd, IDC_SHOWCOUNT, data, FALSE);
}
else
{
MessageBox(hwnd, "Error getting selected item :(", "Warning", MB_OK);
}
}
else
{
// No items selected, or more than one
// Either way, we aren't going to process this.
SetDlgItemText(hwnd, IDC_SHOWCOUNT, "-");
}
}
else
{
MessageBox(hwnd, "Error counting items :(", "Warning", MB_OK);
}
}
break;
}
break;
}
break;
case WM_CLOSE:
EndDialog(hwnd, 0);
break;
default:
return FALSE;
}
return TRUE;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
return DialogBox(hInstance, MAKEINTRESOURCE(IDD_MAIN), NULL, DlgProc);
}Here is my header file.
//{{NO_DEPENDENCIES}}
// Microsoft Developer Studio generated include file.
// Used by ctl_one.rc
//
#define IDD_MAIN 101
#define IDC_TEXT 1000
#define IDC_NUMBER 1001
#define IDC_LIST 1002
#define IDC_ADD 1003
#define IDC_CLEAR 1004
#define IDC_REMOVE 1005
#define IDC_SHOWCOUNT 1006
// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 102
#define _APS_NEXT_COMMAND_VALUE 40001
#define _APS_NEXT_CONTROL_VALUE 1007
#define _APS_NEXT_SYMED_VALUE 101
#endif
#endifAnd here is the resource file.
//Microsoft Developer Studio generated resource script.
//
#include "resource.h"
#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#ifndef __BORLANDC__
#include "winres.h"
#endif
/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
// English (U.S.) resources
#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
#ifdef _WIN32
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
#pragma code_page(1252)
#endif //_WIN32
#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//
1 TEXTINCLUDE DISCARDABLE
BEGIN
"resource.h\0"
END
2 TEXTINCLUDE DISCARDABLE
BEGIN
"#ifndef __BORLANDC__\r\n"
"#include ""winres.h""\r\n"
"#endif\r\n"
"\0"
END
3 TEXTINCLUDE DISCARDABLE
BEGIN
"\0"
END
#endif // APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Dialog
//
IDD_MAIN DIALOG DISCARDABLE 0, 0, 207, 156
STYLE DS_MODALFRAME | DS_CENTER | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Controls One"
FONT 8, "MS Sans Serif"
BEGIN
LTEXT "Add",IDC_STATIC,7,10,14,8
EDITTEXT IDC_TEXT,25,7,120,14,ES_AUTOHSCROLL
EDITTEXT IDC_NUMBER,150,7,21,14,ES_NUMBER
LTEXT "times.",IDC_STATIC,177,10,23,8
LISTBOX IDC_LIST,7,25,138,106,LBS_NOINTEGRALHEIGHT |
LBS_EXTENDEDSEL | WS_VSCROLL | WS_TABSTOP
PUSHBUTTON "&Add",IDC_ADD,150,30,50,14
PUSHBUTTON "&Remove",IDC_REMOVE,150,47,50,14
PUSHBUTTON "&Clear",IDC_CLEAR,150,63,50,14
LTEXT "This item was added",IDC_STATIC,7,141,66,8
CTEXT "-",IDC_SHOWCOUNT,77,141,32,8
LTEXT "times",IDC_STATIC,114,141,17,8
END
/////////////////////////////////////////////////////////////////////////////
//
// DESIGNINFO
//
#ifdef APSTUDIO_INVOKED
GUIDELINES DESIGNINFO DISCARDABLE
BEGIN
IDD_MAIN, DIALOG
BEGIN
LEFTMARGIN, 7
RIGHTMARGIN, 200
VERTGUIDE, 145
VERTGUIDE, 150
TOPMARGIN, 7
BOTTOMMARGIN, 149
END
END
#endif // APSTUDIO_INVOKED
#endif // English (U.S.) resources
/////////////////////////////////////////////////////////////////////////////I keep getting this error:
1>c:\users\chris\desktop\word editor.cpp(85) : error C2440: 'initializing' : cannot convert from 'HGLOBAL' to 'int *'
1> Conversion from 'void*' to pointer to non-'void' requires an explicit cast