C++实现系统补丁查询-systeminfo系统命令查询补丁信息，c++从文件中查找特定的字符串

1.VS2015编码为unicode,fopen打开文件也应该是Unicode文件，才能从文件中查找特定的字符串

2.系统命令systeminfo保存为Unicode文件

systeminfo.bat

powershell -c "systeminfo | Out-File -Encoding unicode systeminfo.txt"

或者

powershell -c "Set-Content 'systeminfo.txt' -Value (systeminfo) -Encoding Unicode"

3.代码实现查找补丁KB4013429

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#pragma warning(disable:4996)
#include<shlwapi.h>


int main()
{
	STARTUPINFO si;
	PROCESS_INFORMATION pi;

	ZeroMemory(&si, sizeof(si));
	si.cb = sizeof(si);
	ZeroMemory(&pi, sizeof(pi));

	 LPTSTR szCmdline=_tcsdup(TEXT("systeminfo.bat"));
	// Start the child process. 
	if (!CreateProcess(NULL,   // No module name (use command line)
		szCmdline,        // Command line
		NULL,           // Process handle not inheritable
		NULL,           // Thread handle not inheritable
		FALSE,          // Set handle inheritance to FALSE
		0,              // No creation flags
		NULL,           // Use parent's environment block
		NULL,           // Use parent's starting directory 
		&si,            // Pointer to STARTUPINFO structure
		&pi)           // Pointer to PROCESS_INFORMATION structure
		)
	{
		//printf("CreateProcess failed (%d).\n", GetLastError());
		//return 0;
		CString str;            // 这是MFC中的字符串变量
		str.Format(_T(" CreateProcess failed (%d)"), GetLastError());    // 调用Format方法将变量转换成字符串，第一个参数就是变量类型
																		 //MessageBox(str, _T(""), MB_ICONINFORMATION);
		AfxMessageBox(str, MB_ICONINFORMATION);
		exit(0);
	}

	// Wait until child process exits.
	WaitForSingleObject(pi.hProcess, INFINITE);

	// Close process and thread handles. 
	CloseHandle(pi.hProcess);
	CloseHandle(pi.hThread);

	FILE * pFile;
	long lSize;
	LPTSTR  buffer;
	size_t result;
	
	// 若要一个byte不漏地读入整个文件，只能采用二进制方式打开 
	pFile = fopen("systeminfo.txt", "rb");
	if (pFile == NULL)
	{
		fputs("File error", stderr);
		exit(1);
	}

	//获取文件大小 
	fseek(pFile, 0, SEEK_END);
	lSize = ftell(pFile);
	rewind(pFile);

	//分配内存存储整个文件
	buffer = (LPTSTR)malloc(sizeof(LPTSTR)*lSize);
	if (buffer == NULL)
	{
		fputs("Memory error", stderr);
		exit(2);
	}

	//将文件拷贝到buffer中 
	//fwrite(buffer, size, count, fp);
	//fwrite(buffer, 1, lSize, pFile);


	result = fread(buffer, 1, lSize, pFile);
	if (result != lSize)
	{
		fputs("Reading error", stderr);
		exit(3);
	}

	
	// 现在整个文件已经在buffer中，可由标准输出打印内容
	printf("%s\n\n\n\n", buffer);

	
	//LPTSTR patch = _T("KB4013429");
	LPTSTR patch = _T("KB4013429");
	if (_tcsstr(buffer, patch))
	{
		printf("pass\n");
	}
	else
		printf("fail\n");

	printf("finish\n");
	// 结束演示，关闭文件并释放内存 
	fclose(pFile);
	free(buffer);
	//*/
	return 0;
}

4.结果

MFC 采用管道方法

void CRuncmdDlg::OnOK() 
{
	// TODO: Add extra validation here
	SECURITY_ATTRIBUTES sa;
	HANDLE hRead,hWrite;
		
	sa.nLength = sizeof(SECURITY_ATTRIBUTES);	
	sa.lpSecurityDescriptor = NULL;  //使用系统默认的安全描述符	
	sa.bInheritHandle = TRUE;  //创建的进程继承句柄

	if (!CreatePipe(&hRead,&hWrite,&sa,0))  //创建匿名管道
	{		
		MessageBox(_T("CreatePipe Failed!"),_T("Tip"),MB_OK | MB_ICONWARNING);		
		return;
	}
	
	STARTUPINFO si;	
	PROCESS_INFORMATION pi;

	ZeroMemory(&si,sizeof(STARTUPINFO));
	si.cb = sizeof(STARTUPINFO);	
	GetStartupInfo(&si);	
	si.hStdError = hWrite;	
	si.hStdOutput = hWrite;	 //新创建进程的标准输出连在写管道一端
	si.wShowWindow = SW_HIDE;  //隐藏窗口	
	si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;

	
	TCHAR cmdline[256] = {_T("systeminfo.exe")};
	//CString tmp,stredit2;
//	GetDlgItemText(IDC_EDIT2,stredit2);  //获取编辑框中输入的命令行
//	tmp.Format(_T("cmd /C %s"),stredit2);
//	_stprintf(cmdline,_T("%s"),tmp);
#ifdef _UNICODE
	//MessageBox(_T("UNICODE!"), _T("提示"), MB_OK | MB_ICONWARNING);
#else
	//MessageBox(_T("ANSI!"), _T("提示"), MB_OK | MB_ICONWARNING);
#endif
	if (!CreateProcess(NULL,cmdline,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))  //创建子进程
	{
		MessageBox(_T("CreateProcess Failed!"),_T("Tip"),MB_OK | MB_ICONWARNING);		
		return;
	}
	CloseHandle(hWrite);  //关闭管道句柄
	
	char buffer[4096] = {0};
	CString strOutput;
	CString PatchKB = {_T("KB3186568")};
	DWORD bytesRead;
		
	 while (true) 
	 {
		if (ReadFile(hRead,buffer,4095,&bytesRead,NULL) == NULL)  //读取管道
	 		break;
		
		strOutput += buffer;
		SetDlgItemText(IDC_EDIT1,strOutput);  //显示输出信息到编辑框,并刷新窗口
		//AfxMessageBox(strOutput);
		//UpdateWindow();
		//Sleep(100);
 	}
	 if (_tcsstr(strOutput, PatchKB))
	 {
		 AfxMessageBox(_T("Pass"));
	 }
	 else
		 AfxMessageBox(_T("Fail"));
	CloseHandle(hRead);
//	CDialog::OnOK();
}