Grafiken importieren unter Visual C++ ?

Hallo zusammen,
könnt Ihr mir ein paar Tipps geben, wie zum Geier ich Grafiken (am liebsten wären mir PNGs, aber BMP oder TGA wären auch super) mit Visual C++ verarbeiten kann!? Also eine PNG-Datei einladen, im Fenster darstellen und wohlmöglich auch die Pixel in einem Array ablegen?

Hilfe - ich bin ECHT verzweifelt!

Am besten Ihr redet mit mir, wie mit einer Idiotin

Idealerweise müsste das eine autonome Lösung sein, die also nicht DirectX oder ActiveX oder irgendeine abgefahrene Dritthersteller-Library verwendet oder hat Microsoft so etwas schon standardmäßig vorgesehen und ich Deppin finde das einfach nicht?

Ich wäre unendlich dankbar, wenn mir jemand eine Lösung präsentieren könnte, bei der - wenn man auf einen Knopf (in seiner Dialogbox) drückt - ein neues Fenster aufgeht, mit dargestelltem Bild.

Liebe Grüße Angelika

PS: Ich verwende Microsoft Visual C++ 6.0

RenéG

such mal nach libpng

Danke, hilft aber nicht weiter - höchstens meine Verzweiflung zu steigern...

Unix-Tom

Hoffe du fängst etwas an damit.

Für Dich egentlich nur die Funktion
void LoadPictureFile(LPCTSTR szFile);
Interessant.

// LoadPic.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "resource.h"
#include <shlobj.h>

#define MAX_LOADSTRING  100
//  2540
#define HIMETRIC_INCH    2540
#define MAP_LOGHIM_TO_PIX(x,ppli)   ( ((ppli)*(x) + HIMETRIC_INCH/2) / HIMETRIC_INCH )
#define WM_USER_SETSCROLLS    (WM_USER + 1)
#define MAXFILES 86
// Global Variables:
HINSTANCE hInst;                                // current instance
TCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];            // The title bar text
LPPICTURE gpPicture;
HWND ghWnd;
CStringArray m_filenamearray;

void LoadPictureFile(LPCTSTR szFile);
int ladefiles(CString nextdir);

int i = 0;
int intervall = 2000;
CString m_direktory;

// Foward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
BOOL                CALLBACK passwortDlgProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
    // TODO: Place code here.
    MSG msg;

    // Initialize global strings
    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadString(hInstance, IDC_LOADPIC, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // Perform application initialization:
    if (!InitInstance (hInstance, nCmdShow)) 
    {
        return FALSE;
    }

    // Main message loop:
    while (GetMessage(&msg, NULL, 0, 0)) 
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    if (gpPicture)
        gpPicture->Release();

    return msg.wParam;
}

//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage is 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 | CS_DBLCLKS ;

    wcex.lpfnWndProc    = (WNDPROC)WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, (LPCTSTR)IDI_LOADPIC);
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+2);
//  wcex.lpszMenuName   = (LPCSTR)IDC_LOADPIC;
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

    return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HANDLE, 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
   gpPicture = NULL;

//   ghWnd = hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW ,
//    CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
  ghWnd = hWnd = CreateWindow(szWindowClass, szTitle, WS_POPUP  ,
     0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN) , NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

//  ShowWindow(hWnd, nCmdShow);
//  UpdateWindow(hWnd);

i = 1;

    ShowWindow(hWnd,SW_MAXIMIZE);
    UpdateWindow(hWnd);
DialogBox(hInst,TEXT ("DIALOG1"),hWnd,passwortDlgProc);

ladefiles(m_direktory);

    SetTimer(hWnd,1,intervall,NULL);

    return TRUE;
}

// This function loads a file into an IStream.
void LoadPictureFile(LPCTSTR szFile)
{
    // open file

    HANDLE hFile = CreateFile(szFile, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
    _ASSERTE(INVALID_HANDLE_VALUE != hFile);

    // get file size
    DWORD dwFileSize = GetFileSize(hFile, NULL);
    _ASSERTE(-1 != dwFileSize);

    LPVOID pvData = NULL;
    // alloc memory based on file size
    HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwFileSize);
    _ASSERTE(NULL != hGlobal);

    pvData = GlobalLock(hGlobal);
    _ASSERTE(NULL != pvData);

    DWORD dwBytesRead = 0;
    // read file and store in global memory
    BOOL bRead = ReadFile(hFile, pvData, dwFileSize, &dwBytesRead, NULL);
    _ASSERTE(FALSE != bRead);
    GlobalUnlock(hGlobal);
    CloseHandle(hFile);

    LPSTREAM pstm = NULL;
    // create IStream* from global memory
    HRESULT hr = CreateStreamOnHGlobal(hGlobal, TRUE, &pstm);
    _ASSERTE(SUCCEEDED(hr) && pstm);

    // Create IPicture from image file
    if (gpPicture)
        gpPicture->Release();
    hr = ::OleLoadPicture(pstm, dwFileSize, FALSE, IID_IPicture, (LPVOID *)&gpPicture);
    _ASSERTE(SUCCEEDED(hr) && gpPicture);   
    pstm->Release();

    InvalidateRect(ghWnd, NULL, TRUE);
}

//
//  FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
//  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)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;
    static HMENU hMenu;
    POINT point;
    CString file;
    CString zaehler;
      static int          cxClient, cyClient, iVscroll, iHscroll ;

    switch (message) 
    {
        case WM_CREATE:
        hMenu = LoadMenu(hInst,(LPCTSTR)IDC_LOADPIC);
        hMenu = GetSubMenu(hMenu,0);
        return 0;

        case WM_COMMAND:
        wmId    = LOWORD(wParam); 
        wmEvent = HIWORD(wParam); 
            // Parse the menu selections:

        switch (wmId)
        {
            case IDM_DIR:
            DialogBox(hInst,TEXT ("DIALOG1"),hWnd,passwortDlgProc);
            break;

            case IDM_KLEIN:
            SetTimer(hWnd,2,15000,NULL);
            ShowWindow(hWnd,SW_HIDE);
            UpdateWindow(hWnd);
            break;

            case IDM_OPEN:
            {
                KillTimer(hWnd,1);
                // get file name to open

                TCHAR szFile[MAX_PATH];
                ZeroMemory(szFile, MAX_PATH);
                OPENFILENAME ofn;
                ZeroMemory(&ofn, sizeof(OPENFILENAME));
                ofn.lStructSize = sizeof(OPENFILENAME);
                ofn.Flags       = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY;
                ofn.hwndOwner   = hWnd;
                ofn.lpstrFilter = _T("Supported Files Types(*.bmp;*.gif;*.jpg;*.ico;*.emf;*.wmf)\0*.bmp;*.gif;*.jpg;*.ico;*.emf;*.wmf\0Bitmaps (*.bmp)\0*.bmp\0GIF Files (*.gif)\0*.gif\0JPEG Files (*.jpg)\0*.jpg\0Icons (*.ico)\0*.ico\0Enhanced Metafiles (*.emf)\0*.emf\0Windows Metafiles (*.wmf)\0*.wmf\0\0");
                ofn.lpstrTitle  = _T("Open Picture File");
                ofn.lpstrFile   = szFile;
                ofn.nMaxFile    = MAX_PATH;
                if (IDOK == GetOpenFileName(&ofn))
                // load the file
                LoadPictureFile(szFile);
            }
        break;

        case IDM_EXIT:
        DestroyWindow(hWnd);
        break;

        default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    break;

    case WM_LBUTTONDBLCLK:
    KillTimer(hWnd,1);
    break;
    case WM_MBUTTONUP:
    SetTimer(hWnd,1,intervall,NULL);
    break;
    case WM_RBUTTONUP:
    point.x = LOWORD(lParam);
    point.y = HIWORD(lParam);
    ClientToScreen(hWnd,&point);
    TrackPopupMenu (hMenu,TPM_LEFTALIGN |TPM_RIGHTBUTTON,point.x,point.y,0,hWnd,NULL);
    return 0;

    case WM_PAINT:
    hdc = BeginPaint(hWnd, &ps);

    if (gpPicture)
        {
            // get width and height of picture
            long hmWidth;
            long hmHeight;
            gpPicture->get_Width(&hmWidth);
            gpPicture->get_Height(&hmHeight);
            // convert himetric to pixels
            RECT rc;
            GetClientRect(hWnd, &rc);

            int nWidth  = MulDiv(hmWidth, GetDeviceCaps(hdc, LOGPIXELSX), HIMETRIC_INCH);
            int nHeight = MulDiv(hmHeight, GetDeviceCaps(hdc, LOGPIXELSY), HIMETRIC_INCH);

            if (nWidth > nHeight) 
            {
                int percent = (rc.bottom - nWidth) * 100 / (rc.bottom);
                nWidth = nWidth + ((nWidth * percent) / 100);
                nHeight = nHeight + ((nHeight * percent) / 100);
            }
            else
            {
                int percent = (rc.right - nHeight) * 100 / (rc.right);
                nWidth = nWidth + ((nWidth * percent) / 100);
                nHeight = nHeight + (nHeight * percent / (100));

            }

            // display picture using IPicture::Render
            gpPicture->Render(hdc, (rc.right-nWidth)/2, (rc.bottom-nHeight)/2, nWidth, nHeight, 0, hmHeight, hmWidth, -hmHeight, &rc);

    }
    EndPaint(hWnd, &ps);
    break;

    case WM_DESTROY:
    KillTimer(hWnd,1);
    KillTimer(hWnd,2);
    PostQuitMessage(0);
    break;

    case WM_TIMER:

    switch (wParam)
    {
        case 1:
        zaehler.Format("%i",i);
        file = m_filenamearray.GetAt(i);
        KillTimer(hWnd,1);
        LoadPictureFile(file);
        SetTimer(hWnd,1,intervall,NULL);
        i++;
        if (i >= m_filenamearray.GetSize()) i = 0;
        break;

        case 2:
        KillTimer(hWnd,2);
        ShowWindow(hWnd,SW_SHOWMAXIMIZED);
        UpdateWindow(hWnd);
        break;
    }
    break;

    default:
    return DefWindowProc(hWnd, message, wParam, lParam);
   }
   return 0;
}

BOOL CALLBACK passwortDlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{

    HWND  htext;

    int ilength = 0;

    switch (message)
    {
    case WM_INITDIALOG:
        return TRUE;
    case WM_COMMAND:
        switch(LOWORD(wParam))
        {
        case IDOK:
            {
                TCHAR intervallvar[20];
                TCHAR passwort[10];
                CString passwortergebniss;
                htext = GetDlgItem(hDlg,IDC_PASSWORT);
                ilength = GetWindowTextLength(htext);
                GetWindowText(htext,passwort,ilength+1);
                passwortergebniss = passwort;
                    if (passwortergebniss == "test")
                    {
                        htext = GetDlgItem(hDlg,IDC_EDIT2);
                        ilength = GetWindowTextLength(htext);
                        GetWindowText(htext,intervallvar,ilength+1);
                        intervall = atoi(intervallvar);
                        intervall *=1000;
                        EndDialog(hDlg,0);
                        return TRUE;
                    } else
                    {
                            PostQuitMessage(0);

                    }

            }

        case IDC_BUTTON1:
            {
                KillTimer(ghWnd,1);
                TCHAR passwort[10];
                CString passwortergebniss;
                htext = GetDlgItem(hDlg,IDC_PASSWORT);
                ilength = GetWindowTextLength(htext);
                GetWindowText(htext,passwort,ilength+1);
                passwortergebniss = passwort;
                    if (passwortergebniss == "test")
                    {
                        TCHAR szFile[MAX_PATH];
                        ZeroMemory(szFile, MAX_PATH);
                        OPENFILENAME ofn;
                        ZeroMemory(&ofn, sizeof(OPENFILENAME));
                        ofn.lStructSize = sizeof(OPENFILENAME);
                        ofn.Flags       = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY;
                        ofn.hwndOwner   = hDlg;
                        ofn.lpstrFilter = _T("Supported Files Types(*.bmp;*.gif;*.jpg;*.ico;*.emf;*.wmf)\0*.bmp;*.gif;*.jpg;*.ico;*.emf;*.wmf\0Bitmaps (*.bmp)\0*.bmp\0GIF Files (*.gif)\0*.gif\0JPEG Files (*.jpg)\0*.jpg\0Icons (*.ico)\0*.ico\0Enhanced Metafiles (*.emf)\0*.emf\0Windows Metafiles (*.wmf)\0*.wmf\0\0");
                        ofn.lpstrTitle  = _T("Open Picture File");
                        ofn.lpstrFile   = szFile;
                        ofn.nMaxFile    = MAX_PATH;
                        if (IDOK == GetOpenFileName(&ofn))
                        // load the file
                        LoadPictureFile(szFile);
                    }

            }
        case IDC_BUTTON2:
            TCHAR bildzahl[5];

            htext = GetDlgItem(hDlg,IDC_BILD);
            ilength = GetWindowTextLength(htext);
            GetWindowText(htext,bildzahl,ilength+1);
            i = atoi(bildzahl);

        case IDC_DIR:
            {

                TCHAR passwort[10];
                CString passwortergebniss;
                htext = GetDlgItem(hDlg,IDC_PASSWORT);
                ilength = GetWindowTextLength(htext);
                GetWindowText(htext,passwort,ilength+1);
                passwortergebniss = passwort;
                    if (passwortergebniss == "test")
                    {
                        char chName[MAX_PATH];
                        BROWSEINFO bi = {0};    // Path-Dialog
                        bi.hwndOwner = ghWnd;
                        LPITEMIDLIST lpIDList = ::SHBrowseForFolder(&bi);
                        if (lpIDList) 
                        {
                            ::SHGetPathFromIDList(lpIDList, chName);

                            m_direktory = chName;
                            if (m_direktory == "") m_direktory = "c:\\";

                        }

                    }
                    else
                    {
                        PostQuitMessage(0);
                    }

            }

        case IDCANCEL:
            EndDialog(hDlg,0);
            return TRUE;
        }
        break;
    }

return FALSE;
}

int ladefiles(CString nextdir)
{

    CString curdir = nextdir;
    CString appname;
    CString ftpfilename;
    CString winfilename;
    CString filename;

    CFile debugtext;
    CString neuezeile;
//  int x = 0;

    CFileFind ftpFind;

        BOOL bContinue = ftpFind.FindFile(curdir + "\\*.*");

//  debugtext.Open("Debug.txt", CFile::modeCreate | CFile::modeNoTruncate);
//  debugtext.Close();

//  if(!debugtext.Open("Debug.txt", CFile::modeWrite))
//  {
//      meldung.Format("%s kann nicht geöffnet werden", speichern);
//      m_pOwner->MessageBox(meldung, "Logdaten", MB_ICONEXCLAMATION);
//  }

while(bContinue > 0)
{
    bContinue = ftpFind.FindNextFile();

    appname = ftpFind.GetFileName();

    if (appname == "." || appname == "..")
    {
    }
    else
    {

        if (ftpFind.IsDirectory() != 0)
        {
            nextdir = curdir + "\\" + appname;
            ladefiles(nextdir);
        }
        else
        {
        if (ftpFind.GetFileName().Right(3) == "bmp" ||
            ftpFind.GetFileName().Right(3) == "gif" ||
            ftpFind.GetFileName().Right(3) == "jpg" ||
            ftpFind.GetFileName().Right(3) == "ico" ||
            ftpFind.GetFileName().Right(3) == "emf" ||
            ftpFind.GetFileName().Right(3) == "wmf")
        {
            m_filenamearray.Add(ftpFind.GetFilePath());
        }

        }
    }

}

//debugtext.Close();

ftpFind.Close();

return 1;

}

Walli

Meinst du jetzt Grafiken in ein Projekt mit einbinden oder aus einer Datei laden?