Kursovaya_promezhutok

gistfile1.txt

#include <windows.h>
#include <commdlg.h>  

HBITMAP hBitmap = NULL;  
HWND hButton;            


HBITMAP LoadBMP(LPCWSTR path) {
    return (HBITMAP)LoadImageW(NULL, path, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
}

void OpenBitmapFile(HWND hwnd) {
    wchar_t fileName[MAX_PATH] = L"";

    OPENFILENAMEW ofn = {};
    ofn.lStructSize = sizeof(ofn);
    ofn.hwndOwner = hwnd;
    ofn.lpstrFilter = L"BMP Files\0*.bmp\0All Files\0*.*\0";
    ofn.lpstrFile = fileName;
    ofn.nMaxFile = MAX_PATH;
    ofn.Flags = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST;
    ofn.lpstrTitle = L"Выберите BMP-файл";

    if (GetOpenFileNameW(&ofn)) {
        if (hBitmap) DeleteObject(hBitmap);
        hBitmap = LoadBMP(fileName);

        if (!hBitmap) {
            DWORD err = GetLastError();
            wchar_t errMsg[256];
            wsprintfW(errMsg, L"Ошибка загрузки BMP! Код: %d", err);
            MessageBoxW(hwnd, errMsg, L"Ошибка", MB_OK | MB_ICONERROR);
        }
        else {
            InvalidateRect(hwnd, NULL, TRUE); 
        }
    }
}


void DrawBitmap(HWND hwnd, HDC hdc) {
    if (!hBitmap) return;  

    HDC hdcMem = CreateCompatibleDC(hdc);
    HBITMAP hbmOld = (HBITMAP)SelectObject(hdcMem, hBitmap);

    BITMAP bmp;
    GetObject(hBitmap, sizeof(BITMAP), &bmp);

    int newWidth = 800;
    int newHeight = 600 - 50; 

    StretchBlt(hdc, 0, 50, newWidth, newHeight,
        hdcMem, 0, 0, bmp.bmWidth, bmp.bmHeight, SRCCOPY);

    SelectObject(hdcMem, hbmOld);
    DeleteDC(hdcMem);
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    switch (msg) {
    case WM_CREATE:
        hButton = CreateWindowW(L"BUTTON", L"Открыть файл",
            WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON,
            10, 10, 150, 30, hwnd, (HMENU)1, NULL, NULL);
        break;

    case WM_COMMAND:
        if (LOWORD(wParam) == 1) { 
            OpenBitmapFile(hwnd);
        }
        break;

    case WM_PAINT:
    {
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(hwnd, &ps);
        DrawBitmap(hwnd, hdc); 
        EndPaint(hwnd, &ps);
    }
    break;

    case WM_GETMINMAXINFO:
    {
        MINMAXINFO* pMMI = (MINMAXINFO*)lParam;
        pMMI->ptMinTrackSize.x = 800;
        pMMI->ptMinTrackSize.y = 600;
        pMMI->ptMaxTrackSize.x = 800;
        pMMI->ptMaxTrackSize.y = 600;
    }
    return 0;

    case WM_DESTROY:
        if (hBitmap) DeleteObject(hBitmap);
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    WNDCLASSW wc = { 0 };
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = L"MainWinClass";

    RegisterClassW(&wc);

    HWND hwnd = CreateWindowW(wc.lpszClassName, L"BMP Viewer",
        WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX,
        CW_USEDEFAULT, CW_USEDEFAULT, 800, 600,
        NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    MSG msg = { 0 };
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return (int)msg.wParam;
}