whats wrong with this code!!

EDN Admin · Jul 24, 2012

m trying to create application which accepts data from the user and place it in a listview... some hows i get one or the other error... please tell me what this error means "hListView is being used wihtout being initialised "... please help..

#define _WIN32_IE 0x300 
#include <windows.h> 
#include <commctrl.h> 
#include <stdio.h> 
#pragma comment(lib, "gdi32.lib") 
#pragma comment(lib, "comctl32.lib") 
#include "resource.h" 
LRESULT CALLBACK WindowFunc(HWND, UINT, WPARAM, LPARAM); 
INT_PTR CALLBACK Add(HWND ,UINT , WPARAM, LPARAM); 
HINSTANCE hThisInst; 
HINSTANCE hInstance; 
LVCOLUMN lvc = { 0 }; 
LVITEM lv = { 0 }; 
 
 
int WINAPI WinMain(HINSTANCE hThisInst, HINSTANCE hPrevInst, 
LPSTR Args, int WinMode) 
{ 
HWND hWnd; 
MSG Message; 
WNDCLASSEX WinClass = { 0 }; 
INITCOMMONCONTROLSEX icc = { 0 }; 
 
hInstance = hThisInst; 
 
icc.dwSize = sizeof(icc); 
icc.dwICC = ICC_LISTVIEW_CLASSES; 
InitCommonControlsEx(&icc); 
 
WinClass.cbSize = sizeof(WNDCLASSEX); 
WinClass.hInstance = hThisInst; 
WinClass.lpszClassName = TEXT("ListViewSample"); 
WinClass.lpfnWndProc = WindowFunc; 
WinClass.style = 0; 
WinClass.hIcon = LoadIcon(NULL, IDI_APPLICATION); 
WinClass.hIconSm = LoadIcon(NULL, IDI_WINLOGO); 
WinClass.hCursor = LoadCursor(NULL, IDC_ARROW); 
WinClass.lpszMenuName = MAKEINTRESOURCE( IDR_MENU1 ); 
WinClass.cbClsExtra = 0; 
WinClass.cbWndExtra = 0; 
WinClass.hbrBackground = (HBRUSH) GetStockObject(LTGRAY_BRUSH); 
 
if(!RegisterClassEx(&WinClass)) return 0; 
//hInst = hThisInst; 
hWnd = CreateWindow(TEXT("ListViewSample"), 
TEXT("List View Sample"), 
WS_OVERLAPPEDWINDOW, 
CW_USEDEFAULT, 
CW_USEDEFAULT, 
CW_USEDEFAULT, 
CW_USEDEFAULT, 
NULL, 
NULL, 
hThisInst, 
NULL); 
 
ShowWindow(hWnd, WinMode); 
UpdateWindow(hWnd); 
 
while(GetMessage(&Message, 
NULL, 
0, 
0)) 
{ 
TranslateMessage(&Message); 
DispatchMessage(&Message); 
} 
return Message.wParam; 
} 
 
LRESULT CALLBACK WindowFunc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam) 
{ 
PAINTSTRUCT ps; 
HDC hdc; 
HWND hListView; 
HWND edit,button_ok; 
TCHAR buff[100]; 
INT_PTR a; 
int wmID, wmEVENT; 
switch(message) 
{ 
case WM_CREATE: 
{ 
edit = CreateWindow(L"EDIT", 
NULL, 
WS_CHILD | WS_VISIBLE | LVS_REPORT, 
700, 
300, 
150, 
50, 
hWnd, 
(HMENU) 600, 
hInstance, 
NULL); 
 
button_ok=CreateWindowEx(NULL, 
(LPCWSTR)L"BUTTON", 
(LPCWSTR)L"OK", 
WS_TABSTOP|WS_VISIBLE| 
WS_CHILD|BS_DEFPUSHBUTTON, 
760, 
370, 
40, 
20, 
hWnd, 
(HMENU)ID_EOK, 
hInstance, 
NULL); 
hListView = CreateWindow(WC_LISTVIEW, 
NULL, 
WS_CHILD | WS_VISIBLE | LVS_REPORT, 
10, 
10, 
500, 
500, 
hWnd, 
(HMENU) 500, 
hInstance, 
NULL); 
 
ListView_SetExtendedListViewStyle(hListView, LVS_EX_FULLROWSELECT | LVS_EX_HEADERDRAGDROP); 
 
lvc.mask = LVCF_TEXT | LVCF_SUBITEM | LVCF_WIDTH | LVCF_FMT; 
lvc.fmt = LVCFMT_CENTER; 
 
/* Add four columns to the list-view (first column contains check box). */ 
lvc.iSubItem = 0; 
lvc.cx = 75; 
lvc.pszText = TEXT("Branch Name"); 
lvc.cx = 100; 
ListView_InsertColumn(hListView, 0, &lvc); 
 
lvc.iSubItem = 1; 
lvc.cx = 100; 
lvc.pszText = TEXT("Attribute 1"); 
ListView_InsertColumn(hListView, 1, &lvc); 
 
lvc.iSubItem = 2; 
lvc.cx = 70; 
lvc.pszText = TEXT("Attribute 2"); 
ListView_InsertColumn(hListView, 2, &lvc); 
 
lvc.iSubItem = 3; 
lvc.cx = 150; 
lvc.pszText = TEXT("Attribute 3"); 
ListView_InsertColumn(hListView, 3, &lvc); 
/* // Add some rows. 
lv.iItem = 0; 
ListView_InsertItem(hListView, &lv); 
ListView_SetItemText(hListView, 0 , 0, TEXT("ece")); 
ListView_SetItemText(hListView, 0, 1, TEXT("Friends")); 
ListView_SetItemText(hListView, 0, 2, TEXT("500")); 
ListView_SetItemText(hListView, 0, 3, TEXT("Alright")); 
ListView_SetCheckState(hListView, 0, TRUE); 
 
 
lv.iItem = 1; 
ListView_InsertItem(hListView, &lv); 
ListView_SetItemText(hListView, 1, 1, TEXT("Survivor")); 
ListView_SetItemText(hListView, 1, 2, TEXT("970,000")); 
ListView_SetItemText(hListView, 1, 3, TEXT("Please, not again")); 
ListView_SetCheckState(hListView, 1, FALSE); 
*/ 
break; 
} 
case WM_COMMAND: 
wmID = LOWORD ( wParam); 
wmEVENT = HIWORD (wParam); 
switch (wmID) 
{ 
/* case ID_EDIT_ADD: 
a = DialogBox(hThisInst, MAKEINTRESOURCE(ID_DIALOG1),hWnd,Add); 
MessageBox(NULL,(LPCWSTR)a, (LPCWSTR)a,MB_OK|MB_ICONINFORMATION); 
break; 
 
case ID_FILE_NEW: 
DeleteAllItem(hListView); 
break; 
*/ 
case ID_EOK: 
int iItem; 
TCHAR ItemText[100]; 
 
//iItem=SendMessage(hListView,LVM_GETITEMCOUNT,0,0); // number of items 
 
GetDlgItemText(hWnd,ID_MEDIT,ItemText,100); // get text from editobx 
 
if((lstrlen(ItemText))==0) // check if items exist 
{ 
MessageBox(hWnd,L"Please Write Some Text",L"Error",MB_OK|MB_ICONINFORMATION); 
break; 
} 
 
lv.iItem=iItem; // choose item to enter to
 
lv.iSubItem=0; // Put in first coluom (no need subitems) 
 
// Text to display (can be from a char variable) (Items) 
lv.pszText=ItemText; 
// Send item text to the Listview 
SendMessage(hListView,LVM_INSERTITEM,0,(LPARAM)&lv); 
}break; 
 
case ID_FILE_EXIT: 
DestroyWindow (hWnd); 
break; 
 
case WM_PAINT: 
hdc = BeginPaint(hWnd, &ps); 
// TODO: Add any drawing code here... 
EndPaint(hWnd, &ps); 
break; 
 
case WM_DESTROY: 
PostQuitMessage(0); 
break; 
default: 
return DefWindowProc(hWnd, 
message, 
wParam, 
lParam); 
} 
return 0; 
} 
INT_PTR CALLBACK Add (HWND Add,UINT message, WPARAM wParam, LPARAM lParam) 
{ 
UNREFERENCED_PARAMETER(lParam); 
TCHAR gg[100]; 
HINSTANCE hinst = LoadLibrary((LPCWSTR)L"RichEd20.dll"); 
switch (message) 
{ 
case WM_COMMAND: 
if(LOWORD(wParam) == IDCANCEL) 
EndDialog( Add, LOWORD(wParam) ); 
//return INT_PTR(TRUE); 
if(LOWORD(wParam) == IDOK) 
{ 
GetDlgItemText(Add, ID_EDIT1, gg,100); 
return (INT_PTR)gg; 
/*if((lstrlen(gg))==0) // check if items exist
 
{ 
MessageBox(Add,gg, L"THE BRANCH DOESN HAV A NAME ??!",MB_OK|MB_ICONINFORMATION); 
break; 
}*/ 
//EndDialog(Add, LOWORD(wParam) ); 
return (INT_PTR)gg; 
} 
 
break; 
} 
return (INT_PTR)FALSE; 
}

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whats wrong with this code!!

EDN Admin

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