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为什么下面代码不行呀:
- /* -------------------------------------------------------------------
- MyWindows.c -- 基本窗口模型
- 《Windows 程序设计(SDK)》视频教程
- --------------------------------------------------------------------*/
- #include <windows.h>
- #include "strsafe.h"
- #include "sysmets.h"
- LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
- int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
- {
- static TCHAR szAppName[] = TEXT("MyWindows");
- HWND hwnd;
- MSG msg;
- WNDCLASS wndclass;
- wndclass.style = CS_HREDRAW | CS_VREDRAW;
- wndclass.lpfnWndProc = WndProc;
- wndclass.cbClsExtra = 0;
- wndclass.cbWndExtra = 0;
- wndclass.hInstance = hInstance;
- wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
- wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
- wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
- wndclass.lpszMenuName = NULL;
- wndclass.lpszClassName = szAppName;
- if (!RegisterClass(&wndclass))
- {
- MessageBox(NULL, TEXT("这个程序需要在 Windows NT 才能执行!"), szAppName, MB_ICONERROR);
- return 0;
- }
- hwnd = CreateWindow(szAppName,
- TEXT("鱼C工作室"),
- WS_OVERLAPPEDWINDOW | WS_VSCROLL,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- NULL,
- NULL,
- hInstance,
- NULL);
- ShowWindow(hwnd, iCmdShow);
- UpdateWindow(hwnd);
- while (GetMessage(&msg, NULL, 0, 0))
- {
- TranslateMessage(&msg);
- DispatchMessage(&msg);
- }
- return msg.wParam;
- }
- LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- HDC hdc;
- PAINTSTRUCT ps;
- TEXTMETRIC tm;
- TCHAR szBuffer[10];
- static int cxChar, cxCaps, cyChar, cxClient, cyClient, iVscrollPos;
- size_t iTarget;
- int i, y, FirstLine, LastLine;
- SCROLLINFO si;
- switch (message)
- {
- case WM_CREATE:
- hdc = GetDC(hwnd);
- GetTextMetrics(hdc, &tm);
- cxChar = tm.tmAveCharWidth;
- cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2;
- cyChar = tm.tmHeight + tm.tmExternalLeading;
- ReleaseDC(hwnd, hdc);
- return 0;
- case WM_PAINT:
- hdc = BeginPaint(hwnd, &ps);
- // 获取滚动条的位置
- si.cbSize = sizeof(si);
- si.fMask = SIF_POS;
- GetScrollInfo(hwnd, SB_VERT, &si);
- iVscrollPos = si.nPos;
- // 计算需要重绘的区域
- FirstLine = max(0, iVscrollPos + ps.rcPaint.top / cyChar);
- LastLine = min(NUMLINES - 1, iVscrollPos + ps.rcPaint.bottom / cyChar);
- for (i = FirstLine; i < LastLine; i++)
- {
- y = cyChar * (i - iVscrollPos);
- StringCchLength(sysmetrics[i].szLabel, 1024, &iTarget);
- TextOut(hdc, 0, y, sysmetrics[i].szLabel, iTarget);
- StringCchLength(sysmetrics[i].szDesc, 1024, &iTarget);
- TextOut(hdc, 22 * cxCaps, y, sysmetrics[i].szDesc, iTarget);
- SetTextAlign(hdc, TA_RIGHT | TA_TOP);
- StringCchPrintf(szBuffer, 10, TEXT("%5d"), GetSystemMetrics(sysmetrics[i].iIndex));
- StringCchLength(szBuffer, 10, &iTarget);
- TextOut(hdc, 22 * cxCaps + 40 * cxChar, y, szBuffer, iTarget);
- SetTextAlign(hdc, TA_LEFT | TA_TOP);
- }
- EndPaint(hwnd, &ps);
- return 0;
- case WM_SIZE:
- // 获得客户区的尺寸
- cyClient = HIWORD(lParam);
- cxClient = LOWORD(lParam);
- // 设置垂直滚动条范围和页面大小(设置页面大小将决定滑块的粗细)
- si.cbSize = sizeof(si);
- si.fMask = SIF_RANGE | SIF_PAGE;
- si.nMin = 0;
- si.nMax = NUMLINES - 1;
- si.nPage = cyClient / cyChar;
- SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
- case WM_VSCROLL:
- // 获得垂直滚动条的所有信息
- si.cbSize = sizeof(si);
- si.fMask = SIF_ALL;
- GetScrollInfo(hwnd, SB_VERT, &si);
- // 保存当前滑块位置,迟些进行比较
- iVscrollPos = si.nPos;
- switch (LOWORD(wParam))
- {
- // 用户点击键盘 Home 按键
- case SB_TOP:
- si.nPos = si.nMin;
- break;
- // 用户点击键盘 End 按键
- case SB_BOTTOM:
- si.nPos = si.nMax;
- break;
- // 用户点击滚动条上边的三角形
- case SB_LINEUP:
- si.nPos -= 1;
- break;
- // 用户点击滚动条下边的三角形
- case SB_LINEDOWN:
- si.nPos += 1;
- break;
- // 用户点击滑块上边的滚动条轴
- case SB_PAGEUP:
- si.nPos -= si.nPage;
- break;
- // 用户点击滑块下边的滚动条轴
- case SB_PAGEDOWN:
- si.nPos += si.nPage;
- break;
- // 用户拖动滚动条
- case SB_THUMBTRACK:
- si.nPos = si.nTrackPos;
- break;
- }
- // 设置滚动条滑块的新位置
- si.fMask = SIF_POS;
- SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
- // 获得滚动条滑块的位置,由于窗口调整,它可能不是同一个值
- GetScrollInfo(hwnd, SB_VERT, &si);
- // 与此前的保存的值进行比较,如果不同则滚动窗口
- if (si.nPos != iVscrollPos)
- {
- ScrollWindow(hwnd, 0, cyChar * (iVscrollPos - si.nPos), NULL, NULL);
- UpdateWindow(hwnd);
- }
- return 0;
- case WM_DESTROY:
- PostQuitMessage(0);
- return 0;
- }
- return DefWindowProc(hwnd, message, wParam, lParam);
- }
复制代码
问题1、如下图:
为什么这些文字没有都画出来??
问题2、我调整窗口的宽度,滚动条还是会往上一行,
这该怎么解决?
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