Win32API实现的第一个CrackMe

摘要：程序界面已实现功能整个窗口居中显示，灰化最大化按钮，空白处添加了消息回调，最后就是获取输入运算后判断是否和预期相同，从而决定弹窗内容这就是一般的的套路完整源码指定该结构体的大小宽度高度变化时重绘窗口回调函数表示系统图标，默认图标默认光标使用

已实现功能
整个窗口居中显示，灰化最大化按钮，空白处添加了消息回调，最后就是获取输入运算后判断是否和预期相同，从而决定弹窗内容！这就是一般的 CrackMe 的套路

#include 
#include 

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
BOOL Check(char *Name, char *Flag);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR lpCmdLine, int nCmdShow)
{
    char *lpClassName = "FirstWin", *lpWindowName = "CrackMe0";
    HWND hwnd;
    MSG msg;
    WNDCLASSEX wndclass;

    wndclass.cbSize = sizeof(wndclass);       // 指定该结构体的大小
    wndclass.style = CS_HREDRAW | CS_VREDRAW; // 宽度高度变化时重绘
    wndclass.lpfnWndProc = WndProc;           // 窗口回调函数
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);    // NULL表示系统图标，默认图标
    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);      // 默认光标
    wndclass.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1); // 使用画刷填充背景色，还可以(HBRUSH)GetStockObject(BLACK_BRUSH)
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = lpClassName;
    wndclass.hIconSm = NULL;

    if (!RegisterClassEx(&wndclass))
    {
        MessageBox(NULL, "Register Failed", "Tips", MB_ICONERROR);
        return 0;
    }

    hwnd = CreateWindow(lpClassName,
                        lpWindowName,
                        WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX, //style，WS_OVERLAPPEDWINDOW包括了最大化最小化以及关闭
                        0,                                                        // x
                        0,                                                        // y
                        400,                                                      // width
                        300,                                                      // height
                        NULL,                                                     // hWndParent
                        NULL,                                                     // hMenu
                        hInstance,                                                // hInstance
                        NULL);
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd); /* 发送 WM_PAINT，保证窗口一定可以刷新显示 */

    while (GetMessage(&msg, NULL, 0, 0))
    {
        /* 用于Tab切换输入框，IsDialogMessage会调用user32.dll处理某些按键消息，其余的交给我们定义的窗口回调函数*/
        if (!IsDialogMessage(hwnd, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }
    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    int screenWidth, screenHeight;
    int clientWidth, clientHeight;
    int id, event;
    PAINTSTRUCT ps;
    CHAR Name[32], Flag[32];
    RECT rect;
    RECT crect;

    switch (message)
    {
    case WM_CREATE:
        /* 设置居中显示主窗口 */
        screenWidth = GetSystemMetrics(SM_CXSCREEN);
        screenHeight = GetSystemMetrics(SM_CYSCREEN);
        GetClientRect(hwnd, &crect);
        GetWindowRect(hwnd, &rect); // 区别于GetClientRect
        rect.left = (screenWidth - rect.right) / 2;
        rect.top = (screenHeight - rect.bottom) / 2;
        SetWindowPos(hwnd, HWND_TOP, rect.left, rect.top, rect.right, rect.bottom, SWP_SHOWWINDOW);
        /* MoveWindow(hwnd, rect.left, rect.top, rect.right, rect.bottom, 1); 效果同上 */
        CreateWindow("static",
                     "Name:",
                     WS_CHILD | WS_VISIBLE | SS_CENTERIMAGE | SS_RIGHT,
                     crect.right / 12, // 用比例保证兼容性
                     crect.bottom / 5,
                     90,
                     40,
                     hwnd,
                     (HMENU)1,
                     (HINSTANCE)GetWindowLong(hwnd, -6), // # define GWL_HINSTANCE -6
                     NULL);
        CreateWindow("static",
                     "Flag:",
                     WS_CHILD | WS_VISIBLE | SS_CENTERIMAGE | SS_RIGHT,
                     crect.right / 12,
                     crect.bottom * 2 / 5,
                     90,
                     40,
                     hwnd,
                     (HMENU)2,
                     (HINSTANCE)GetWindowLong(hwnd, -6),
                     NULL);
        CreateWindow("edit",
                     "",
                     WS_CHILD | WS_VISIBLE | WS_BORDER | WS_TABSTOP | ES_AUTOHSCROLL,
                     crect.right / 3,
                     crect.bottom / 5,
                     200,
                     35,
                     hwnd,
                     (HMENU)3,
                     (HINSTANCE)GetWindowLong(hwnd, -6),
                     NULL);
        CreateWindow("edit",
                     "",
                     WS_CHILD | WS_VISIBLE | WS_BORDER | WS_TABSTOP | ES_AUTOHSCROLL,
                     crect.right / 3,
                     crect.bottom * 2 / 5,
                     200,
                     35,
                     hwnd,
                     (HMENU)4,
                     (HINSTANCE)GetWindowLong(hwnd, -6),
                     NULL);
        CreateWindow("button",
                     "Submit",
                     WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT,
                     crect.right * 2 / 5,
                     crect.bottom * 16 / 25,
                     100,
                     35,
                     hwnd,
                     (HMENU)5,
                     (HINSTANCE)GetWindowLong(hwnd, -6),
                     NULL);
        break;
    case WM_CTLCOLORSTATIC:
        if ((HWND)lParam == GetDlgItem(hwnd, 1) || (HWND)lParam == GetDlgItem(hwnd, 2))
        {
            SetTextColor((HDC)wParam, RGB(0, 0, 0));
            SetBkMode((HDC)wParam, TRANSPARENT);
        }
        return (BOOL)(HBRUSH)GetStockObject(NULL_BRUSH);
        break;
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        EndPaint(hwnd, &ps);
        break;
    case WM_LBUTTONDOWN:
        MessageBox(hwnd, "Don"t click here!", "Error", MB_OK);
        break;
    case WM_COMMAND:
        /* 当点击菜单、按钮、下拉列表框等控件时候,会触发WM_COMMAND */
        id = LOWORD(wParam);
        event = HIWORD(wParam);
        switch (id)
        {
        case 5:
            GetWindowText(GetDlgItem(hwnd, 3), Name, 32);
            GetWindowText(GetDlgItem(hwnd, 4), Flag, 32);
            if (*Name != 0 && *Flag != 0) // 字符判断时要加*，还可以用长度判断是否为空字符串；空字符串或者字符串结束就是内存中的00
            {
                if (Check(Name, Flag)) // 字符串判断要用strcmp；格式化输出的%s是个特例需要传地址
                {
                    MessageBox(hwnd, "Hi,admin!Your flag is right!", "Right", MB_OK);
                    DestroyWindow(hwnd);
                }
                else
                {
                    MessageBox(hwnd, "Your name or flag is wrong!", "Wrong", MB_OK);
                    DestroyWindow(hwnd);
                }
            }
            else
            {
                MessageBox(hwnd, "Please input your name and flag!", "Tips", MB_OK);
            }
            break;
        default:
            return DefWindowProc(hwnd, message, wParam, lParam);
        }
        break;
    case WM_CLOSE:
        DestroyWindow(hwnd);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}

BOOL Check(char *Name, char *Flag)
{
    int i, len;
    char x;
    char *key = "You_are_a_pig!2333";
    char flag_enc[] = {0x3f, 0x03, 0x14, 0x38, 0x1a, 0x26, 0x0d, 0x36, 0x54, 0x00, 0x41, 0x1a, 0x38, 0x47, 0x5e, 0x52, 0x0a, 0x4e};
    if (!strcmp(Name, "admin") && strlen(Flag) == 18)
    {
        for (i = 0; i < len; i++)
        {
            x = Flag[i] ^ key[i];
            if (x != flag_enc[i])
            {
                return 0;
            }
            else
            {
                continue;
            }
        }
    }
    else
    {
        return 0;
    }
    return 1;
}

很简单的 CrackMe，主要是为了学习 Windows 消息机制，程序调用gcc -m32 -mwindows编译的