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( 第四十讲 )

( 第四十讲 ). 吉林大学远程教育课件. Windows A P I 编 程. 学 时： 48. 主讲人 : 翟慧杰. 例 1 ： #include <windows.h> #define MAX_STRINGS 256// 最大字符串数 typedef struct { HDC hdc; int xText; int yText; int xStart; int yStart; int xIncr; int yIncr;

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( 第四十讲 )

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  1. (第四十讲) 吉林大学远程教育课件 Windows A P I编 程 学 时：48 主讲人 : 翟慧杰

  2. 例1： #include <windows.h> #define MAX_STRINGS 256//最大字符串数 typedef struct { HDC hdc; int xText; int yText; int xStart; int yStart; int xIncr; int yIncr; int xMax; int yMax; }CBPARAM;

  3. PSTR pszStrings[MAX_STRINGS]; int iTotal = 0;//当前字符串数目 BOOL CALLBACK GetStr (PSTR pString, CBPARAM *pcbp); //函数：DllMain //作用：DLL入口 int WINAPI DllMain ( HINSTANCE hInstance, DWORD fdwReason, PVOID pvReserved) { return TRUE; }

  4. //函数：EnterString //作用：输入字符串 int WINAPI EnterString (PSTR pStringIn) { HANDLE hString; PSTR pString; int i, iLength, iCompare; if (iTotal == MAX_STRINGS - 1)//达到最大字符串数目 return FALSE; iLength = strlen (pStringIn);//获取字符串长度 if (iLength == 0)//空字符串 return FALSE; //创建映像文件 hString=CreateFileMapping((HANDLE)-1,NULL, PAGE_READWRITE, 0, 1 + iLength, NULL); if (hString == NULL) return FALSE;

  5. pString = (PSTR) MapViewOfFile (hString, FILE_MAP_WRITE, 0, 0, 0); strcpy (pString, pStringIn); AnsiUpper (pString);//全部转换成大写 for (i = iTotal; i > 0; i--) { iCompare = strcmpi (pStringIn, pszStrings[i - 1]); //比较字符串 if (iCompare >= 0)//字符出不等则调处循环 break; pszStrings[i] = pszStrings[i - 1]; //字符出相等则删除字符串 } pszStrings[i] = pString; iTotal++; return TRUE; }

  6. //函数：DeleteString //作用：输入字符串 int WINAPI DeleteString(PSTR pStringIn) { int i, j, iCompare; if (0 == strlen (pStringIn))//忽略输入的空字符串 return FALSE; for (i = 0 ; i < iTotal ; i++)//字符串排序 { iCompare = lstrcmpi (pszStrings[i], pStringIn); if (iCompare == 0) break; } if (i == iTotal) return FALSE; UnmapViewOfFile (pszStrings[i]); for (j = i ; j < iTotal ; j++) pszStrings[j] = pszStrings[j + 1]; pszStrings[iTotal--] = NULL; return TRUE; }

  7. //函数：GetStrings //作用：输出所有的字符串 int WINAPI GetStrings(CBPARAM * pParam) { BOOL bReturn; int i; for (i = 0; i < iTotal; i++) { bReturn = GetStr(pszStrings[i], pParam); if (bReturn == FALSE) return i + 1; } return iTotal; }

  8. //函数：GetStrCallBack //作用：输出一个字符串 BOOL CALLBACK GetStr (PSTR pString, CBPARAM *pcbp) { TextOut (pcbp->hdc, pcbp->xText, pcbp->yText,pString, strlen (pString)); if ((pcbp->yText += pcbp->yIncr) > pcbp->yMax) { pcbp->yText = pcbp->yStart; if ((pcbp->xText += pcbp->xIncr) > pcbp->xMax) return FALSE; } return TRUE ; }

  9. #include<windows.h> #include<string.h> #include"exetest.h" #define MAXLEN 32 #define MAX_STRINGS 256 //最大字符串数 #define WM_DATACHANGE WM_USER typedef struct { HDC hdc; int xText; int yText; int xStart; int yStart; int xIncr; int yIncr; int xMax; int yMax; }CBPARAM;

  10. LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM); //声明动态链接库中的函数原型 int WINAPI EnterString (PSTR pStringIn); int WINAPI DeleteString (PSTR pStringIn); int WINAPI GetStrings(CBPARAM * pParam); char szAppName[] = "exetest"; char szString[MAXLEN]; //函数：WinMain //作用：程序入口 int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)

  11. { HWND hwnd; MSG msg; WNDCLASSEX wndclass; wndclass.cbSize = sizeof (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 = szAppName; wndclass.lpszClassName = szAppName; wndclass.hIconSm = LoadIcon (NULL, IDI_APPLICATION); RegisterClassEx (&wndclass);

  12. hwnd = CreateWindow (szAppName, "DLL Demonstration Program", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL); ShowWindow (hwnd, iCmdShow); UpdateWindow (hwnd); //消息循环 while (GetMessage (&msg, NULL, 0, 0)) { TranslateMessage (&msg); DispatchMessage (&msg); } return msg.wParam; }

  13. //函数：DlgProc //作用：对话可小型处理 BOOL CALLBACK DlgProc (HWND hDlg, UINT iMsg, WPARAM wParam, LPARAM lParam) { switch (iMsg) { case WM_INITDIALOG://初始化窗口 SendDlgItemMessage (hDlg, IDD_STRING,EM_LIMITTEXT,MAXLEN - 1,0); return TRUE;

  14. case WM_COMMAND://响应用户在对话框中的操作 switch (wParam) { case IDOK://用户单击确认按钮 //获取字符串 GetDlgItemText (hDlg, IDD_STRING, szString, MAXLEN); EndDialog (hDlg, TRUE);//关闭对话框 return TRUE; case IDCANCEL://用户单击关闭按钮 EndDialog (hDlg, FALSE);//关闭对话框 return TRUE; } } return FALSE ; }

  15. //函数：EnumCallBack //作用：通知主窗口中的数据是否发生变化 BOOL CALLBACK EnumCallBack (HWND hwnd, LPARAM lParam) { char szClassName[16] ; GetClassName (hwnd, szClassName, sizeof (szClassName));//获取窗口类名 if (0 == strcmp (szClassName, szAppName)) SendMessage (hwnd, WM_DATACHANGE, 0, 0) ; return TRUE ; } //函数：WndProc //作用：处理主窗口消息 LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam) {

  16. static HINSTANCE hInst; static int cxChar, cyChar, cxClient, cyClient; CBPARAM cbparam; HDC hdc; PAINTSTRUCT ps; TEXTMETRIC tm; switch (iMsg) {case WM_CREATE://创建窗口消息 hInst = ((LPCREATESTRUCT) lParam)->hInstance; hdc = GetDC (hwnd); GetTextMetrics (hdc, &tm); cxChar = (int) tm.tmAveCharWidth; cyChar = (int) (tm.tmHeight + tm.tmExternalLeading);

  17. ReleaseDC (hwnd, hdc); return 0 ; case WM_COMMAND: switch (wParam) { case IDM_ENTER ://单击输入菜单项 //生成添加对话框 if (DialogBox (hInst, "EnterDlg", hwnd, &DlgProc)) { if (EnterString (szString))//调用DLL中定义的函数EnterString EnumWindows (&EnumCallBack, 0); else MessageBeep (0); } break;

  18. case IDM_DELETE://单击删除菜单项 //生成删除对话框 if (DialogBox (hInst, "DeleteDlg", hwnd, &DlgProc)) { if (DeleteString (szString)) EnumWindows (&EnumCallBack, 0); else MessageBeep (0); } break; } return 0;

  19. case WM_SIZE://改变窗口大小 cxClient = (int) LOWORD (lParam); cyClient = (int) HIWORD (lParam); return 0; case WM_DATACHANGE://工作区中的数据发生变化 InvalidateRect (hwnd, NULL, TRUE); return 0; case WM_PAINT://重绘窗口 hdc = BeginPaint (hwnd, &ps); cbparam.hdc = hdc; cbparam.xText = cbparam.xStart = cxChar; cbparam.yText = cbparam.yStart = cyChar; cbparam.xIncr = cxChar * MAXLEN; cbparam.yIncr = cyChar; cbparam.xMax = cbparam.xIncr * (1 + cxClient / cbparam.xIncr); cbparam.yMax = cyChar * (cyClient / cyChar - 1);

  20. //调用动态链接库定义中的函数GetStrings GetStrings (&cbparam); EndPaint (hwnd, &ps); return 0; case WM_DESTROY://应用程序结束 PostQuitMessage (0); return 0; } return DefWindowProc (hwnd, iMsg, wParam, lParam); }

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