Windows API 函数学习(7)---文件操作示例
// FileOprator.cpp : Defines the entry point for the application.
//本程序演示了，文件的创建、写入、读取、复制、更名、删除的操作!
#include "stdafx.h"
#include "resource.h"
#include <winbase.h>
#define MAX_LOADSTRING 100
// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // The title bar text
HANDLE hFile;//文件句柄
char szFilePath[MAX_PATH];//文件路径
HWND hEdit;//输入框句柄
HMENU hMenu;//菜单句柄
// Foward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM);
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;
// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_FILEOPRATOR, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_FILEOPRATOR);
// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return msg.wParam;
}
//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
// This function and its usage is only necessary if you want this code
// to be compatible with Win32 systems prior to the 'RegisterClassEx'
// function that was added to Windows 95. It is important to call this function
// so that the application will get 'well formed' small icons associated
// with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = (WNDPROC)WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_FILEOPRATOR);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = (LPCSTR)IDC_FILEOPRATOR;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);
return RegisterClassEx(&wcex);
}
//
// FUNCTION: InitInstance(HANDLE, 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)
{
HWND hWnd;
hInst = hInstance; // Store instance handle in our global variable
hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//
// FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
// 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)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
TCHAR szHello[MAX_LOADSTRING];
LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);
switch (message)
{
case WM_CREATE://创建输入框，更新菜单，获取当前路径
hEdit=CreateWindow("EDIT",NULL,WS_VISIBLE|WS_CHILD|WS_BORDER|ES_AUTOHSCROLL,0,0,400,30,hWnd,(HMENU)IDC_EDIT,
hInst,NULL);
GetCurrentDirectory(MAX_PATH,szFilePath);
SendMessage(hEdit,EM_LIMITTEXT,128,0);//限制最多输入128个字节的内容
hMenu=GetMenu(hWnd);
EnableMenuItem(GetSubMenu(hMenu,2),IDM_READFILE,MF_BYCOMMAND|MF_GRAYED);
EnableMenuItem(GetSubMenu(hMenu,2),IDM_WRITE,MF_BYCOMMAND|MF_GRAYED);
EnableMenuItem(GetSubMenu(hMenu,2),IDM_COPYFILE,MF_BYCOMMAND|MF_GRAYED);
EnableMenuItem(GetSubMenu(hMenu,2),IDM_MOVEFILE,MF_BYCOMMAND|MF_GRAYED);
EnableMenuItem(GetSubMenu(hMenu,2),IDM_DELETEFILE,MF_BYCOMMAND|MF_GRAYED);
break;
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_CREATE://创建文件
hFile=CreateFile("Create.txt",GENERIC_WRITE|GENERIC_READ,FILE_SHARE_WRITE|FILE_SHARE_READ,NULL,
CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0);
if(hFile==INVALID_HANDLE_VALUE)
{
MessageBox(NULL,"Error Create File!","Error",MB_OK);
break;
}
else
{
MessageBox(hWnd,"Create File Success!","Open File",MB_OK);
}
EnableMenuItem(GetSubMenu(hMenu,2),IDM_WRITE,MF_BYCOMMAND|MF_ENABLED);
EnableMenuItem(GetSubMenu(hMenu,2),IDM_CREATE,MF_GRAYED|MF_BYCOMMAND);
EnableMenuItem(GetSubMenu(hMenu,2),IDM_COPYFILE,MF_BYCOMMAND|MF_ENABLED);
break;
case IDM_WRITE://写入内容
char szBuffer[128];
unsigned long lWrite;
GetDlgItemText(hWnd,IDC_EDIT,szBuffer,128);
if(strlen(szBuffer)==0)
{
MessageBox(NULL,"Please Input Text(Max length 128)","Error",MB_OK);
return 0;
}
SetFilePointer(hFile,0,0,FILE_END);
WriteFile(hFile,szBuffer,strlen(szBuffer),&lWrite,NULL);
if(!lWrite)
{
MessageBox(NULL,"WriteError","Error",MB_OK);
}
EnableMenuItem(GetSubMenu(hMenu,2),IDM_READFILE,MF_BYCOMMAND|MF_ENABLED);
break;
case IDM_READFILE://从文件中读取最长128个字符
char szRead[128];
unsigned long lRead;
SetFilePointer(hFile,0,0,FILE_BEGIN);
ReadFile(hFile,szRead,128,&lRead,NULL);
if(!lRead)
{
MessageBox(NULL,"Error Read!","Error",MB_OK);
}
else if(lRead==128)
{
szRead[lRead-1]=0;
}
else
{
szRead[lRead]=0;
}
SetDlgItemText(hWnd,IDC_EDIT,szRead);
break;
case IDM_COPYFILE://复制文件
char szPath[MAX_PATH];
wsprintf(szPath,"%s//%s",szFilePath,"Create.txt");
CopyFile(szPath,"D://Create.txt",FALSE);
EnableMenuItem(GetSubMenu(hMenu,2),IDM_COPYFILE,MF_BYCOMMAND|MF_GRAYED);
EnableMenuItem(GetSubMenu(hMenu,2),IDM_MOVEFILE,MF_BYCOMMAND|MF_ENABLED);
EnableMenuItem(GetSubMenu(hMenu,2),IDM_DELETEFILE,MF_BYCOMMAND|MF_ENABLED);
MessageBox(NULL,"Create.txt is copied to d://","CopyFile",MB_OK);
break;
case IDM_MOVEFILE://给复制的文件更名
MoveFile("D://Create.txt","D://new.txt");
break;
case IDM_DELETEFILE://删除文件
WIN32_FIND_DATA wfd;
HANDLE hFind;
hFind=FindFirstFile("D://new.txt",&wfd);
if((int)hFind==-1)//如果没有改名，需要删除Create.txt
{
DeleteFile("D://Create.txt");
break;
}
CloseHandle(hFind);
DeleteFile("d://new.txt");
break;
case IDM_ABOUT:
DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
break;
case IDM_EXIT:
CloseHandle(hFile);//关闭文件句柄
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code here...
RECT rt;
GetClientRect(hWnd, &rt);
// DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_INITDIALOG:
return TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return TRUE;
}
break;
}
return FALSE;
}
