Dev-C++ / Discussion / Project Developers (Delphi): Problems compiling a windows tutorial

Hi everyone I am working my way through some windows tutorials from www.winprog.org I am using Dev Cpp 4.9.7.7 (latest critical update) and am having a problem when I compile this tutorial.

Its quite a long piece of code but I will include it here in the hope that someone out there may be able to help the problem occurs at line 86 and produces the error "illegal conversion from void to int"

Source code:

#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 presses the ADD button first we get the
                     // number of times to add the given string that was entered
                     // in the Number Of box

                     BOOL bSuccess;
                     int ntimes = GetDlgItemInt(hwnd, IDC_NUMBER, &bSuccess, FALSE);
                     if(bSuccess)
                     {
                         // Then we get the string they entered
                         // First we need to find 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 listbox 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);
                             }

                             // Don't 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);// Error occurs here
                            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, theres 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);
}

Compiler output:

Compiler: Default compiler
Building Makefile: "C:\Documents and Settings\Jon Edwards.HOME-MAIN-PC\My Documents\Dev-Cpp Projects and Tutorials\Windows Programs from the forger tutorials\Control Tutorial 1\Makefile.win"
Executing make clean
rm -f "Control 1.o" "CTL 1.exe"g++.exe -c "Control 1.cpp" -o "Control 1.o" -I"C:/Dev-Cpp/include" -I"C:/Dev-Cpp/include/c++" -I"C:/Dev-Cpp/include/akrip" -I"C:/Dev-Cpp/include/c++/mingw32" -I"C:/Dev-Cpp/include/c++/mingw32/bits" -I"C:/Dev-Cpp/include/c++/backward" -I"C:/Dev-Cpp/include/c++/bits" -I"C:/Dev-Cpp/include/c++/ext" -I"C:/Dev-Cpp/include/FL" -I"C:/Dev-Cpp/include/GL" -I"C:/Dev-Cpp/include/sys" Control 1.cpp: In function `BOOL DlgProc(HWND__*, unsigned int, unsigned int, long int)':Control 1.cpp:86: invalid conversion from `void*' to `int*'make.exe: *** ["Control] Error 1Execution terminated

any help here would be greatly appreciated

Thankyou in advance

Jon

Problems compiling a windows tutorial

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Problems compiling a windows tutorial

Problems compiling a windows tutorial

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Problems compiling a windows tutorial