写了个win32函数对文件操作的程序，这里记录一下。
FileHandle.h
#pragma once #define MAX_RECORD 100 typedef struct _PhoneRecord { char id[4]; // id char name[16]; // name char phoneNumber[20]; // 电话号码 unsigned short int state; // 电话状态（0未接、1已接、2已拨） char oTime[20]; // 发生时间 char usedTime[8]; // 通话时长 char other[32]; // 扩展用 }PhoneRecord; #define FILE_NAME _T("record.log") class CFileHandle { public: CFileHandle(void); virtual ~CFileHandle(void); CString FileName; // 文件名称 BOOL CreateARecord(PhoneRecord record); // 新增一条记录 BOOL DeteleARecord(char* id); // 删除一条记录 BOOL DeteleARecord(int n); // 删除第n条记录 BOOL DeleteAllRecords(); // 删除所有记录 BOOL ModifyARecord(char* id, PhoneRecord record); // 修改一条记录 BOOL ModifyARecord(int n, PhoneRecord record); // 修改第n条记录 BOOL ReadARecord(PhoneRecord& record); // 读取一条记录 BOOL ReadARecord(int n, PhoneRecord& record); // 读取第n条记录 BOOL CString2Char(CString str, char* buf, int bufInLen, int& bufOutLen); // CString转char* BOOL Char2CString(char* buf, int bufLen, CString& str); // char*转CString BOOL GetRecordCount(DWORD& size); // 获取record总条数 BOOL FindAEmptyRecord(char* id); // 找出最近一条空记录(以phoneNumber为空判断为空记录) BOOL InsertARecord(PhoneRecord record); // 插入一条新记录到文件中(插入到空的record中，无空record则新增一条) };
FileHandle.cpp
#include "StdAfx.h" #include "FileHandle.h" CFileHandle::CFileHandle(void) { } CFileHandle::~CFileHandle(void) { } //******************************************************************** // Function : CreateARecord // Description : 新增一条记录 // Input : record : PhoneRecord结构体 // Output : NONE // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::CreateARecord(PhoneRecord record) { // CreateFile HANDLE hFile = CreateFile(FILE_NAME, GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); if(hFile == INVALID_HANDLE_VALUE){ //MessageBox(L"创建test.txt文件失败"); ::OutputDebugStringW(L"--- CreateARecord create file fail ---\r\n"); return FALSE; } // point to file end //BOOL ok = SetEndOfFile(hFile); DWORD point = SetFilePointer(hFile, 0, 0, FILE_END); /*if(!point){ ::OutputDebugStringW(L"--- CreateARecord point to file end fail ---\r\n"); return FALSE; }*/ // WriteFile DWORD dwWritenSize = 0; BOOL ok = WriteFile(hFile, &record, sizeof(record), &dwWritenSize, NULL); if(ok){ // flush the data to file ok = FlushFileBuffers(hFile); //AfxMessageBox(L"写入文件成功"); } else{ //MessageBoxW(NULL, L"写入文件失败", L"提示", 0); ::OutputDebugStringW(L"--- CreateARecord write a new record to file fail ---\r\n"); } CloseHandle(hFile); hFile = INVALID_HANDLE_VALUE; return ok; } //******************************************************************** // Function : DeteleARecord // Description : 删除一条记录,删除后的记录只有id值存在，其他为空。只要电话号码为空则为空记录 // Input : id : n的取值大于等于0 // Output : NONE // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::DeteleARecord(char *id) { if(id == NULL) return FALSE; PhoneRecord record; memset(&record, 0, sizeof(record)); memcpy(record.id, id, strlen(id)); BOOL ok = ModifyARecord(id, record); return true; } //******************************************************************** // Function : DeteleARecord // Description : 删除第n条记录,删除后的记录只有id值存在，其他为空。只要电话号码为空则为空记录 // Input : id : n的取值大于等于0 // Output : NONE // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::DeteleARecord(int n) { if(n < 0) return FALSE; PhoneRecord record; memset(&record, 0, sizeof(record)); // int to char char *p = itoa(n, record.id, 10); if(p == NULL) return FALSE; BOOL ok = ModifyARecord(n, record); return true; } //******************************************************************** // Function : DeleteAllRecords // Description : 删除所有记录 // Input : NONE // Output : NONE // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::DeleteAllRecords() { // CreateFile HANDLE hFile = CreateFile(FILE_NAME, GENERIC_WRITE, 0, NULL, TRUNCATE_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if(hFile == INVALID_HANDLE_VALUE){ ::OutputDebugStringW(L"--- DeleteAllRecords create file fail ---\r\n"); return FALSE; } CloseHandle(hFile); hFile = INVALID_HANDLE_VALUE; return TRUE; } //******************************************************************** // Function : ModifyARecord // Description : 修改一条记录 // Input : id : n的取值大于等于0 // Input : record : PhoneRecord结构体 // Output : NONE // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::ModifyARecord(char *id, PhoneRecord record) { // get file record size DWORD dwSize; BOOL ok = GetRecordCount(dwSize); if(!ok) return FALSE; // read a record PhoneRecord recordT; for(unsigned int i=0; i<dwSize; i++){ memset(&recordT, 0, sizeof(recordT)); ok = ReadARecord(i, recordT); if(!ok) break; // write to file if(strcmp(recordT.id, id) == 0){ // CreateFile HANDLE hFile = CreateFile(FILE_NAME, GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if(hFile == INVALID_HANDLE_VALUE){ ::OutputDebugStringW(L"--- ModifyARecord create file fail ---\r\n"); return FALSE; } // point to the No.i record DWORD point = SetFilePointer(hFile, i*sizeof(record), 0, FILE_BEGIN); // WriteFile DWORD dwWritenSize = 0; ok = WriteFile(hFile, &record, sizeof(record), &dwWritenSize, NULL); if(ok){ // flush the data to file ok = FlushFileBuffers(hFile); } else{ ::OutputDebugStringW(L"--- ModifyARecord write a new record to file fail ---\r\n"); } CloseHandle(hFile); hFile = INVALID_HANDLE_VALUE; return ok; } } return FALSE; } //******************************************************************** // Function : ModifyARecord // Description : 修改第n条记录 // Input : n : n的取值大于等于0 // Input : record : PhoneRecord结构体 // Output : NONE // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::ModifyARecord(int n, PhoneRecord record) { if(n < 0) return FALSE; // get file record size DWORD dwSize; BOOL ok = GetRecordCount(dwSize); if(!ok) return FALSE; if(n >= dwSize) return FALSE; // CreateFile HANDLE hFile = CreateFile(FILE_NAME, GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if(hFile == INVALID_HANDLE_VALUE){ ::OutputDebugStringW(L"--- ModifyARecord create file fail ---\r\n"); return FALSE; } // point to the No.i record DWORD point = SetFilePointer(hFile, n*sizeof(record), 0, FILE_BEGIN); // WriteFile DWORD dwWritenSize = 0; ok = WriteFile(hFile, &record, sizeof(record), &dwWritenSize, NULL); if(ok){ // flush the data to file ok = FlushFileBuffers(hFile); } else{ ::OutputDebugStringW(L"--- ModifyARecord write a new record to file fail ---\r\n"); } CloseHandle(hFile); hFile = INVALID_HANDLE_VALUE; return TRUE; } //******************************************************************** // Function : ReadARecord // Description : 读取一条记录 // Input : NONE // Output : record : PhoneRecord结构体 // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::ReadARecord(PhoneRecord &record) { // CreateFile HANDLE hFile = CreateFile(FILE_NAME, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if(hFile == INVALID_HANDLE_VALUE){ //MessageBox(L"创建test.txt文件失败"); ::OutputDebugStringW(L"--- ReadARecord create file fail ---\r\n"); return FALSE; } int size = sizeof(record); memset(&record, 0, size); DWORD dwReadSize = 0; // ReadFile BOOL ok = ReadFile(hFile, &record, size, &dwReadSize, NULL); CloseHandle(hFile); return ok; } //******************************************************************** // Function : ReadARecord // Description : 读取第n条记录 // Input : NONE // Output : record : PhoneRecord结构体 // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::ReadARecord(int n, PhoneRecord &record) { if(n<0) return FALSE; // CreateFile HANDLE hFile = CreateFile(FILE_NAME, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if(hFile == INVALID_HANDLE_VALUE){ //MessageBox(L"创建test.txt文件失败"); ::OutputDebugStringW(L"--- ReadARecord create file fail ---\r\n"); return FALSE; } int size = sizeof(record); memset(&record, 0, size); DWORD dwReadSize = 0; // point to No.n record DWORD point = SetFilePointer(hFile, n*size, 0, FILE_BEGIN); /*if(!point){ ::OutputDebugStringW(L"--- ReadARecord point to No.n record fail ---\r\n"); return FALSE; }*/ // ReadFile BOOL ok = ReadFile(hFile, &record, size, &dwReadSize, NULL); CloseHandle(hFile); return ok; } //******************************************************************** // Function : CString2Char // Description : CString转char* // Input : str : CString类型字符串，可含中英文 // Input : bufInLen : buf的size大小 // Output : buf : char类型字符串 // Output : bufOutLen : 实际读取字符串的长度 // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::CString2Char(CString str, char *buf, int bufInLen, int& bufOutLen) { if(str.IsEmpty() || buf == NULL || bufInLen<=0) return FALSE; // CString to WCHAR WCHAR *wch = (WCHAR*)str.GetBuffer(str.GetLength()); memset(buf, 0, bufInLen); // WCHRA to char WideCharToMultiByte( CP_ACP, 0, wch, -1, buf, bufInLen, NULL, NULL ); // get str length, this will cout the string length which can include chinese and english bufOutLen = 0; for(int i=0; i<str.GetLength(); i++){ WCHAR data = str.GetAt(i); if(data > 0x80){ bufOutLen += 2; } else{ bufOutLen++; } } return TRUE; } //******************************************************************** // Function : Char2CString // Description : char*转CString // Input : buf : char类型字符串 // Input : bufLen : buf的长度 // Output : str : CString类型字符串 // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::Char2CString(char *buf, int bufLen, CString &str) { if(buf == NULL || bufLen<=0) return FALSE; // char to WCHAR WCHAR* wch = new WCHAR(bufLen); memset(wch, 0, sizeof(wch)); MultiByteToWideChar( CP_ACP, 0, buf, bufLen, wch, bufLen/sizeof(WCHAR) ); str = L""; // WCHAR to CString for(unsigned int i=0; i<wcslen(wch); i++) str.AppendChar(wch[i]); return TRUE; } //******************************************************************** // Function : CreateARecord // Description : 新增一条记录 // Input : record : PhoneRecord结构体 // Output : NONE // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::GetRecordCount(DWORD &size) { // CreateFile HANDLE hFile = CreateFile(FILE_NAME, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if(hFile == INVALID_HANDLE_VALUE){ ::OutputDebugStringW(L"--- GetRecordCount create file fail ---\r\n"); size = 0; return FALSE; } // get file size DWORD dwSize = GetFileSize(hFile, NULL); CloseHandle(hFile); size = dwSize/sizeof(PhoneRecord); return TRUE; } //******************************************************************** // Function : FindAEmptyRecord // Description : 找出最近一条空记录(以phoneNumber为空判断为空记录) // Input : NONE // Output : id : n的取值大于等于0 // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::FindAEmptyRecord(char* id) { if(id == NULL) return FALSE; BOOL ret = FALSE; // CreateFile HANDLE hFile = CreateFile(FILE_NAME, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if(hFile == INVALID_HANDLE_VALUE){ //MessageBox(L"创建test.txt文件失败"); ::OutputDebugStringW(L"--- ReadARecord create file fail ---\r\n"); return FALSE; } // get file size DWORD dwSize = GetFileSize(hFile, NULL); if(dwSize <= 0){ CloseHandle(hFile); hFile = INVALID_HANDLE_VALUE; return FALSE; } // read a record PhoneRecord recordT; DWORD dwReadSize = 0; for(unsigned int i=0; i<dwSize; i++){ memset(&recordT, 0, sizeof(recordT)); // ReadFile BOOL ok = ReadFile(hFile, &recordT, sizeof(recordT), &dwReadSize, NULL); if(!ok) break; char t_id[4] = ""; char *p = itoa(i, t_id, 10); if(p == NULL) break; // query which record has a empty phoneNumber if(strcmp(recordT.id, t_id) == 0){ if(strlen(recordT.phoneNumber)==0){ memcpy(id, recordT.id, sizeof(recordT.id)); ret = TRUE; break; } } } CloseHandle(hFile); hFile = INVALID_HANDLE_VALUE; return ret; } //******************************************************************** // Function : InsertARecord // Description : 插入一条新记录到文件中(插入到空的record中，无空record则新增一条) // Input : record : PhoneRecord结构体 // Output : NONE // return : TRUE/FALSE //******************************************************************** BOOL CFileHandle::InsertARecord(PhoneRecord record) { // find empty record memset(record.id, 0, sizeof(record.id)); BOOL ok = FindAEmptyRecord(record.id); if(ok){// do insert ok = ModifyARecord(record.id, record); } else{// do create // get how many records DWORD dwSize=0; ok = GetRecordCount(dwSize); // char to int char *p = itoa(dwSize, record.id, 10); if(p == NULL) return FALSE; // create a record ok = CreateARecord(record); } return ok; }
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