当我重新缩放图像或最小化窗口时，用Gdiplus创建的图像就消失了

问题描述 投票：0回答：1

我正在尝试重新创建一个 1996 年的程序，但几乎没有人知道。它被称为交互识别杆菌。我正在使用 C++ 和 Gdiplus 重新创建它，它最初是使用 Macromedia Director 5 创建的。目前，我正在尝试获取标题页和带有制作人员名单的关于页面。问题是我要显示图像，如果我最小化窗口或重新缩放窗口，图像就会消失。

对于一些上下文，我不是一个很好的编码员，我已经走到了这一步，没有人工智能并且仍然会不使用人工智能。我所能做的就是寻求帮助，但我在搜索中发现的任何内容都无法帮助我。

我已经尝试了很多方法来解决这个问题。我已禁用调整屏幕大小，并强制其保持全屏。有一行代码没有执行任何操作，如果需要，我会将其删除并发布到此处。 Gdiplus 给我带来了很大的痛苦，因为事情已经发生了变化，人们现在使用 direct2d 或类似的东西。 我还有一个按钮可以最小化它并关闭窗口，因为没有一种简单的方法可以做到这一点，当要使用该程序的人无法仅使用 Alt+Tab 时或 Alt+F4 转到不同的窗口。

有代码在窗口重新缩放时使用 WM_REDRAW *WM_PAINT 函数，但由于某种原因，它不显示图像。我正在使用 EMF 文件作为图像。

编辑我的意思是 WM_PAINT 而不是 WM_REDRAW，抱歉，我忘了它叫什么了

这是所请求的代码

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

#include "framework.h"
#include "Identibactor.h"
#include <gdiplus.h>
using namespace Gdiplus;



#define MAX_LOADSTRING 100

// Global Variables
HINSTANCE hInst;                                // current instance
WCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name
int screenX = GetSystemMetrics(SM_CXSCREEN);
int screenY = GetSystemMetrics(SM_CYSCREEN);

void DisableMaximizeButtonagain(HWND hwnd)
{
    SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) & SIZEFULLSCREEN  );
}
// 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_PTR CALLBACK    Minimize(HWND, UINT, WPARAM, LPARAM);

INT_PTR CALLBACK    Close(HWND, UINT, WPARAM, LPARAM);

void draw(HDC hdc);
int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPWSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);

    // TODO: Place code here.
       // Init GDI +
    GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR gdiplusToken;
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, nullptr);

    // Initialize global strings
    LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadStringW(hInstance, IDC_IDENTIBACTOR, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

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

    HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_IDENTIBACTOR));

    MSG msg;

    // Main message loop:
    while (GetMessage(&msg, nullptr, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
        GdiplusShutdown(gdiplusToken);
    }

    return (int) msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEXW 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_IDENTIBACTOR));
    wcex.hCursor        = LoadCursor(nullptr, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = MAKEINTRESOURCEW(IDC_IDENTIBACTOR);
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

    return RegisterClassExW(&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)
{
   hInst = hInstance; // Store instance handle in our global variable

   HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);
   DisableMaximizeButtonagain(hWnd);

   if (!hWnd)
   {
      return FALSE;
   }
   
   ShowWindow(hWnd, SW_SHOWMAXIMIZED);
   
   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)
{
    switch (message)
    {
    case WM_COMMAND:
        {
            int wmId = LOWORD(wParam);
            // Parse the menu selections:
            switch (wmId)
            {
            case IDM_CLOSE:
                DialogBox(hInst, MAKEINTRESOURCE(IDD_CLOSEBUTTON), hWnd, Close);
                SendMessage(hWnd, WM_CLOSE, 0, 0L);
                return(0);
            case IDM_MINIMIZE:
                DialogBox(hInst, MAKEINTRESOURCE(IDD_MINIMIZEBUTTON), hWnd, Minimize);
                PostMessage(hWnd, WM_SYSCOMMAND,SC_MINIMIZE,0);
                return(0);
            case 104:
                DialogBoxW(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
                break;
            
            case IDM_EXIT:
                DestroyWindow(hWnd);
                break;
            default:
                return DefWindowProc(hWnd, message, wParam, lParam);
            }
        }
        break;

    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hWnd, &ps);
                        
            // TODO: Add any drawing code that uses hdc here...
            

            draw(hdc);

            EndPaint(hWnd, &ps);
        }
//    I have removed this in my actual code, just keeping it here for reference, it does nothing
//    case WM_SIZE:
//    {
//        WM_PAINT;
//    }
//        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;



}
INT_PTR CALLBACK Close(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;
}
INT_PTR CALLBACK Minimize(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;
}
void draw(HDC hdc) {
    Graphics gf(hdc);
    Image images(L"IdentibactorTitle.emf");

    gf.DrawImage(&images, 0, 0, screenX, screenY);
}

这大概就是我认为问题所在的地方

case WM_COMMAND:
        {
            int wmId = LOWORD(wParam);
            // Parse the menu selections:
            switch (wmId)
            {
            case IDM_CLOSE:
                DialogBox(hInst, MAKEINTRESOURCE(IDD_CLOSEBUTTON), hWnd, Close);
                SendMessage(hWnd, WM_CLOSE, 0, 0L);
                return(0);
            case IDM_MINIMIZE:
                DialogBox(hInst, MAKEINTRESOURCE(IDD_MINIMIZEBUTTON), hWnd, Minimize);
                PostMessage(hWnd, WM_SYSCOMMAND,SC_MINIMIZE,0);
                return(0);
            case 104:
                DialogBoxW(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
                break;
            
            case IDM_EXIT:
                DestroyWindow(hWnd);
                break;
            default:
                return DefWindowProc(hWnd, message, wParam, lParam);
            }
        }
        break;

    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hWnd, &ps);
                        
            // TODO: Add any drawing code that uses hdc here...
            

            draw(hdc);

            EndPaint(hWnd, &ps);
        }
    case WM_SIZE:
    {
       InvalidateRect(hWnd, NULL,NULL);
    }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}
c++ gdi+
1个回答
0
投票

我刚刚修好了。我不小心将 Gdi 关闭代码放入消息框内。我的错，刚刚才弄清楚。

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