API程序设计实例

#include <windows.h> #include <commctrl.h> #include "resource.h" const char g_szClassName[] = "myWindowClass"; const char g_szChildClassName[] = "myMDIChildWindowClass"; #define IDC_MAIN_MDI 101 #define IDC_MAIN_TOOL 102 #define IDC_MAIN_STATUS 103 #define IDC_CHILD_EDIT 101 #define ID_MDI_FIRSTCHILD 50000 HWND g_hMDIClient = NULL; HWND g_hMainWindow = NULL; BOOL LoadTextFileToEdit(HWND hEdit, LPCTSTR pszFileName) { HANDLE hFile; BOOL bSuccess = FALSE; hFile = CreateFile(pszFileName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL); if(hFile != INVALID_HANDLE_VALUE) { DWORD dwFileSize; dwFileSize = GetFileSize(hFile, NULL); if(dwFileSize != 0xFFFFFFFF) { LPSTR pszFileText; pszFileText = GlobalAlloc(GPTR, dwFileSize + 1); if(pszFileText != NULL) { DWORD dwRead; if(ReadFile(hFile, pszFileText, dwFileSize, &dwRead, NULL)) { pszFileText[dwFileSize] = 0; // Add null terminator if(SetWindowText(hEdit, pszFileText)) bSuccess = TRUE; // It worked! } GlobalFree(pszFileText); } } CloseHandle(hFile); } return bSuccess; } BOOL SaveTextFileFromEdit(HWND hEdit, LPCTSTR pszFileName) { HANDLE hFile; BOOL bSuccess = FALSE; hFile = CreateFile(pszFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); if(hFile != INVALID_HANDLE_VALUE) { DWORD dwTextLength; dwTextLength = GetWindowTextLength(hEdit); // No need to bother if there's no text. if(dwTextLength > 0) { LPSTR pszText; DWORD dwBufferSize = dwTextLength + 1; pszText = GlobalAlloc(GPTR, dwBufferSize); if(pszText != NULL) { if(GetWindowText(hEdit, pszText, dwBufferSize)) { DWORD dwWritten; if(WriteFile(hFile, pszText, dwTextLength, &dwWritten, NULL)) bSuccess = TRUE; } GlobalFree(pszText); } } CloseHandle(hFile); } return bSuccess; } void DoFileOpen(HWND hwnd) { OPENFILENAME ofn; char szFileName[MAX_PATH] = ""; ZeroMemory(&ofn, sizeof(ofn)); ofn.lStructSize = sizeof(ofn); ofn.hwndOwner = hwnd; ofn.lpstrFilter = "Text Files (*.txt)\0*.txt\0All Files (*.*)\0*.*\0"; ofn.lpstrFile = szFileName; ofn.nMaxFile = MAX_PATH; ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY; ofn.lpstrDefExt = "txt"; if(GetOpenFileName(&ofn)) { HWND hEdit = GetDlgItem(hwnd, IDC_CHILD_EDIT); if(LoadTextFileToEdit(hEdit, szFileName)) { SendDlgItemMessage(g_hMainWindow, IDC_MAIN_STATUS, SB_SETTEXT, 0, (LPARAM)"Opened..."); SendDlgItemMessage(g_hMainWindow, IDC_MAIN_STATUS, SB_SETTEXT, 1, (LPARAM)szFileName); SetWindowText(hwnd, szFileName); } } } void DoFileSave(HWND hwnd) { OPENFILENAME ofn; char szFileName[MAX_PATH] = ""; ZeroMemory(&ofn, sizeof(ofn)); ofn.lStructSize = sizeof(ofn); ofn.hwndOwner = hwnd; ofn.lpstrFilter = "Text Files (*.txt)\0*.txt\0All Files (*.*)\0*.*\0"; ofn.lpstrFile = szFileName; ofn.nMaxFile = MAX_PATH; ofn.lpstrDefExt = "txt"; ofn.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT; if(GetSaveFileName(&ofn)) { HWND hEdit = GetDlgItem(hwnd, IDC_CHILD_EDIT); if(SaveTextFileFromEdit(hEdit, szFileName)) { SendDlgItemMessage(g_hMainWindow, IDC_MAIN_STATUS, SB_SETTEXT, 0, (LPARAM)"Saved..."); SendDlgItemMessage(g_hMainWindow, IDC_MAIN_STATUS, SB_SETTEXT, 1, (LPARAM)szFileName); SetWindowText(hwnd, szFileName); } } } HWND CreateNewMDIChild(HWND hMDIClient) { MDICREATESTRUCT mcs; HWND hChild; mcs.szTitle = "[Untitled]"; mcs.szClass = g_szChildClassName; mcs.hOwner = GetModuleHandle(NULL); mcs.x = mcs.cx = CW_USEDEFAULT; mcs.y = mcs.cy = CW_USEDEFAULT; mcs.style = MDIS_ALLCHILDSTYLES; hChild = (HWND)SendMessage(hMDIClient, WM_MDICREATE, 0, (LONG)&mcs); if(!hChild) { MessageBox(hMDIClient, "MDI Child creation failed.", "Oh Oh...", MB_ICONEXCLAMATION | MB_OK); } return hChild; } LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) { switch(msg) { case WM_CREATE: { HWND hTool; TBBUTTON tbb[3]; TBADDBITMAP tbab; HWND hStatus; int statwidths[] = {100, -1}; CLIENTCREATESTRUCT ccs; // Create MDI Client // Find window menu where children will be listed ccs.hWindowMenu = GetSubMenu(GetMenu(hwnd), 2); ccs.idFirstChild = ID_MDI_FIRSTCHILD; g_hMDIClient = CreateWindowEx(WS_EX_CLIENTEDGE, "mdiclient", NULL, WS_CHILD | WS_CLIPCHILDREN | WS_VSCROLL | WS_HSCROLL | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, hwnd, (HMENU)IDC_MAIN_MDI, GetModuleHandle(NULL), (LPVOID)&ccs); if(g_hMDIClient == NULL) MessageBox(hwnd, "Could not create MDI client.", "Error", MB_OK | MB_ICONERROR); // Create Toolbar hTool = CreateWindowEx(0, TOOLBARCLASSNAME, NULL, WS_CHILD | WS_VISIBLE, 0, 0, 0, 0, hwnd, (HMENU)IDC_MAIN_TOOL, GetModuleHandle(NULL), NULL); if(hTool == NULL) MessageBox(hwnd, "Could not create tool bar.", "Error", MB_OK | MB_ICONERROR); // Send the TB_BUTTONSTRUCTSIZE message, which is required for // backward compatibility. SendMessage(hTool, TB_BUTTONSTRUCTSIZE, (WPARAM)sizeof(TBBUTTON), 0); tbab.hInst = HINST_COMMCTRL; tbab.nID = IDB_STD_SMALL_COLOR; SendMessage(hTool, TB_ADDBITMAP, 0, (LPARAM)&tbab); ZeroMemory(tbb, sizeof(tbb)); tbb[0].iBitmap = STD_FILENEW; tbb[0].fsState = TBSTATE_ENABLED; tbb[0].fsStyle = TBSTYLE_BUTTON; tbb[0].idCommand = ID_FILE_NEW; tbb[1].iBitmap = STD_FILEOPEN; tbb[1].fsState = TBSTATE_ENABLED; tbb[1].fsStyle = TBSTYLE_BUTTON; tbb[1].idCommand = ID_FILE_OPEN; tbb[2].iBitmap = STD_FILESAVE; tbb[2].fsState = TBSTATE_ENABLED; tbb[2].fsStyle = TBSTYLE_BUTTON; tbb[2].idCommand = ID_FILE_SAVEAS; SendMessage(hTool, TB_ADDBUTTONS, sizeof(tbb)/sizeof(TBBUTTON), (LPARAM)&tbb); // Create Status bar hStatus = CreateWindowEx(0, STATUSCLASSNAME, NULL, WS_CHILD | WS_VISIBLE | SBARS_SIZEGRIP, 0, 0, 0, 0, hwnd, (HMENU)IDC_MAIN_STATUS, GetModuleHandle(NULL), NULL); SendMessage(hStatus, SB_SETPARTS, sizeof(statwidths)/sizeof(int), (LPARAM)statwidths); SendMessage(hStatus, SB_SETTEXT, 0, (LPARAM)"Hi there :)"); } break; case WM_SIZE: { HWND hTool; RECT rcTool; int iToolHeight; HWND hStatus; RECT rcStatus; int iStatusHeight; HWND hMDI; int iMDIHeight; RECT rcClient; // Size toolbar and get height hTool = GetDlgItem(hwnd, IDC_MAIN_TOOL); SendMessage(hTool, TB_AUTOSIZE, 0, 0); GetWindowRect(hTool, &rcTool); iToolHeight = rcTool.bottom - rcTool.top; // Size status bar and get height hStatus = GetDlgItem(hwnd, IDC_MAIN_STATUS); SendMessage(hStatus, WM_SIZE, 0, 0); GetWindowRect(hStatus, &rcStatus); iStatusHeight = rcStatus.bottom - rcStatus.top; // Calculate remaining height and size edit GetClientRect(hwnd, &rcClient); iMDIHeight = rcClient.bottom - iToolHeight - iStatusHeight; hMDI = GetDlgItem(hwnd, IDC_MAIN_MDI); SetWindowPos(hMDI, NULL, 0, iToolHeight, rcClient.right, iMDIHeight, SWP_NOZORDER); } break; case WM_CLOSE: DestroyWindow(hwnd); break; case WM_DESTROY: PostQuitMessage(0); break; case WM_COMMAND: switch(LOWORD(wParam)) { case ID_FILE_EXIT: PostMessage(hwnd, WM_CLOSE, 0, 0); break; case ID_FILE_NEW: CreateNewMDIChild(g_hMDIClient); break; case ID_FILE_OPEN: { HWND hChild = CreateNewMDIChild(g_hMDIClient); if(hChild) { DoFileOpen(hChild); } } break; case ID_FILE_CLOSE: { HWND hChild = (HWND)SendMessage(g_hMDIClient, WM_MDIGETACTIVE,0,0); if(hChild) { SendMessage(hChild, WM_C