win32文件读写demo

灰太狼 2022-11-07 04:18 163阅读 0赞

新建一个控制台工程；代码；

// file.cpp : Defines the entry point for the console application.
    //
    
    #include "stdafx.h"
    #include <windows.h>
    #include <tchar.h>
    #include <stdio.h>
    
    HANDLE hOutput;
    
    void perro(LPTSTR pszTitle){
    	LPVOID pvErrMsg = NULL;
    	DWORD nError = GetLastError();
    	FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
    		NULL, nError,
    		MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED),
    		(LPTSTR)&pvErrMsg,
    		0, NULL);
    	TCHAR szText[256];
    	HANDLE hOutput = GetStdHandle(STD_OUTPUT_HANDLE);
    	wsprintf(szText, "%s(errno=%d):%s\n", pszTitle, nError, (LPTSTR)pvErrMsg);
    	WriteConsole(hOutput, szText, wcslen(szText), NULL, NULL);
    	WriteConsole(hOutput, szText, 50, NULL, NULL);
    	LocalFree(pvErrMsg);
    }
    
    void Create()
    {
    	HANDLE hFile = CreateFile(
    		_T("Y:/file.txt"), GENERIC_WRITE,
    		FILE_SHARE_READ, NULL, CREATE_ALWAYS,
    		FILE_ATTRIBUTE_NORMAL, NULL);
    	CloseHandle(hFile);
    }
    void Write()
    {
    	HANDLE hFile = CreateFile(
    		_T("Y:/file.txt"), GENERIC_WRITE,
    		FILE_SHARE_READ, NULL, OPEN_ALWAYS,
    		FILE_ATTRIBUTE_NORMAL, NULL);
    	// 1 多字节字符集
    	CHAR szText[] = "hello win32 file";
    	DWORD nLen = 0;
    	WriteFile(hFile, szText, strlen(szText), &nLen, NULL);
    	printf("准备写入:%d,实际写入:%d\n",strlen(szText), nLen);
    	// 2 Unicode字符集
    	//TCHAR szText[] = _T("hello file");
    	//DWORD nLen = 0;
    	//WriteFile(hFile, szText, wcslen(szText)*sizeof(szText[0]), &nLen, NULL);
    	//TCHAR pszText[256] = { 0 };
    	//wsprintf(pszText, _T("准备写入:%d,实际写入:%d\n"), wcslen(szText), nLen);
    	//WriteConsole(hOutput, pszText, wcslen(pszText), NULL, NULL);
    	CloseHandle(hFile);
    }
    void Read()
    {
    	HANDLE hFile = CreateFile(_T("y:/file.txt"),
    		GENERIC_READ, FILE_SHARE_READ, NULL,
    		OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL,
    		NULL);
    	DWORD nHight = 0;
    	DWORD nLow = GetFileSize(hFile, &nHight);
    	DWORD nLen = 0;
    	// 1 多字节字符集
    	//CHAR szText[256] = { 0 };
    	//ReadFile(hFile, szText, nLow, &nLen, NULL);
    	//printf("数据:%s,准备读取:%d,实际读取:%d\n",szText, nLow, nLen);
    	// 2 Unicode 字符集
    	TCHAR szText[256] = { 0 };
    	ReadFile(hFile, szText, nLow, &nLen, NULL);
    	TCHAR pszText[256] = { 0 };
    	wsprintf(pszText, _T("数据:%s, 准备读取 : %d, 实际读取 : %d\n"), szText, nLow, nLen);
    	//WriteConsole(hOutput, pszText, wcslen(pszText), NULL, NULL);
    	WriteConsole(hOutput, pszText, 150, NULL, NULL);
    	CloseHandle(hFile);
    }
    void UseFile()
    {
    //	CopyFile( _T("y:/file.txt"), _T("Y:/123/nofile.txt"), FALSE );
    //	DeleteFile( _T("y:/file.txt"));
    	MoveFile(_T("y:/123/nofile.txt"), _T("y:/file.txt"));
    	perro(_T("MoveFile"));
    }
    
    int _tmain(int argc, _TCHAR* argv[])
    {
    	hOutput = GetStdHandle(STD_OUTPUT_HANDLE);
    	Create( );
    	Write( );
    	Read( );
    	//UseFile();
    	return 0;
    }

运行如下；

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JjYm9ibzIxY24_size_16_color_FFFFFF_t_70][]

WriteConsole(hOutput, szText, wcslen(szText), NULL, NULL) 这句，wcslen(szText)会报如下的错，

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JjYm9ibzIxY24_size_16_color_FFFFFF_t_70 1][]

先改为直接使用数值， WriteConsole(hOutput, szText, 50, NULL, NULL)；

如果要使用printf则包含 \#include <stdio.h>；

hOutput = GetStdHandle(STD\_OUTPUT\_HANDLE)，获取控制台窗口句柄；

WriteConsole(hOutput, szText, 50, NULL, NULL)，往控制台窗口写；

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JjYm9ibzIxY24_size_16_color_FFFFFF_t_70 1]: /images/20221023/a152174d3c20476a8be1868229c2a530.png