Win32 C++: Creation and Calling method from separate C++ file - c++

Question

I'm new to win32 c++ programming and I need help figuring out how to include methods in other files in my Win32 c++ application. I want to write methods in other files and include them in my code. I want to have a separate file, openFile, containing a method that is called from OpenWordGUI will pass back the file path. Is this possible?
Currently my code looks like the following:
// OpenWordDocGUI.cpp : Defines the entry point for the application.
//
#include "stdafx.h"
#include "OpenWordDocGUI.h"
#define MAX_LOADSTRING 100
//Defines for buttons
#define TSP_BUTTON 1
#define PCM_BUTTON 2
#define GO_BUTTON 3
//Defines Text boxes
#define TSP_BOX 101
#define PCM_BOX 102
//For text box
HWND TSPBox;
HWND PCMBox;
// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
//Globals for
TCHAR szFilters[] = _T("Input files (*.*)\0*.*\0\0");
TCHAR szFilePathName[_MAX_PATH] = _T("");
//Store file paths in separate variables
TCHAR TSPFilePath[_MAX_PATH] = _T("");
TCHAR PCMFilePath[_MAX_PATH] = _T("");
int textBoxStat = 0;
TCHAR szInputBoxPathName[_MAX_PATH];
// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;
// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_OPENWORDDOCGUI, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_OPENWORDDOCGUI));
// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
// This function and its usage are only necessary if you want this code
// to be compatible with Win32 systems prior to the 'RegisterClassEx'
// function that was added to Windows 95. It is important to call this function
// so that the application will get 'well formed' small icons associated
// with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_OPENWORDDOCGUI));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCE(IDC_OPENWORDDOCGUI);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
//
// FUNCTION: InitInstance(HINSTANCE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
hInst = hInstance; // Store instance handle in our global variable
hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//
// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
//Default
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
// Fill the OPENFILENAME structure for use in
// TSP/PCM buttons
OPENFILENAME ofn = {0};
ofn.lStructSize = sizeof(OPENFILENAME);
ofn.hwndOwner = hWnd;
ofn.lpstrFilter = szFilters;
ofn.lpstrFile = szFilePathName; // This will hold the file name
ofn.lpstrDefExt = _T("dat");
ofn.nMaxFile = _MAX_PATH;
ofn.lpstrTitle = _T("Open File");
ofn.Flags = OFN_OVERWRITEPROMPT | OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
//////
switch (message)
{
case WM_CREATE:
//TSP MOA Button Creation
//Will bring up open file dialog when clicked
CreateWindow(TEXT("button"), TEXT("TSP MOA"),
WS_VISIBLE | WS_CHILD,
10, 10, 80, 25,
hWnd, (HMENU) TSP_BUTTON, NULL, NULL
);
//Window to show Selected TSP MOA
TSPBox = CreateWindow(TEXT("edit"), TEXT(""),
WS_BORDER | WS_CHILD | WS_VISIBLE,
100, 10, 400, 25,
hWnd, (HMENU) TSP_BOX,
NULL, NULL);
//PCM File Button Creation
//Will bring up open file dialog when clicked
CreateWindow(TEXT("button"), TEXT("PCM File"),
WS_VISIBLE | WS_CHILD,
10, 50, 80, 25,
hWnd, (HMENU) PCM_BUTTON, NULL, NULL
);
//Text box for PCM file creation
PCMBox = CreateWindow(TEXT("edit"), TEXT(""),
WS_BORDER | WS_CHILD | WS_VISIBLE,
100, 50, 400, 25,
hWnd, (HMENU) PCM_BOX,
NULL, NULL);
//Execute compare button
CreateWindow(TEXT("button"), TEXT("Compare"),
WS_VISIBLE | WS_CHILD,
10, 90, 80, 25,
hWnd, (HMENU) GO_BUTTON, NULL, NULL
);
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
case TSP_BUTTON:
//TSP Button clicked
//Open file dialog to select TSP MOA - done
//
TSPFilePath = openFile(TSP);
break;
case PCM_BUTTON:
//PCM Button clicked
//Open file dialog to select PCM file
PCMFilePath = openFile(PCM);
break;
case GO_BUTTON:
//Execute the following
//Read TSP MOA
//TSP MOA to Excel
//PCM to Excel
//compare TSP Excel to PCM
//Do data check
//Get data from TSP Text box
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
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;
}
// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}
Openfile would look something like:
#include <Commdlg.h>
#include <windows.h>
TCHAR* openFile(systemSel)
{
if (systemSel == "TSP")
{
//Set filter for openfile to word docs
} else {
//set filter for openfile to excel files
}
OPENFILENAME ofn ;
TCHAR szFile[MAX_PATH] ;
// open a file name
ZeroMemory( &ofn , sizeof( ofn));
ofn.lStructSize = sizeof ( ofn );
ofn.hwndOwner = NULL ;
ofn.lpstrFile = szFile ;
ofn.lpstrFile[0] = '\0';
ofn.nMaxFile = sizeof( szFile );
ofn.lpstrFilter = "All\0*.*\0Text\0*.TXT\0";
ofn.nFilterIndex =1;
ofn.lpstrFileTitle = NULL ;
ofn.nMaxFileTitle = 0 ;
ofn.lpstrInitialDir=NULL ;
ofn.Flags = OFN_PATHMUSTEXIST|OFN_FILEMUSTEXIST ;
GetOpenFileName( &ofn )
return szFile
}

Answer 1

You need to have a header file which declares function openFile. Including this header in OpenWordDocGUI.cpp does the job.
There are a lot of tutorials on the internet showing how to write own header files to access functions within another .cpp file.
For example try this one: http://www.learncpp.com/cpp-tutorial/19-header-files