模擬的暴力破解rar純數字密碼的小程序

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>


bool ExecDosCmd(char* strcmd)
{
    SECURITY_ATTRIBUTES sa;
    HANDLE hRead = NULL, hWrite = NULL;

    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = TRUE;

    if (!CreatePipe(&hRead, &hWrite, &sa, 0))
    {
        return false;
    }

    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    si.cb = sizeof(STARTUPINFO);
    GetStartupInfo(&si);
    si.hStdError = hWrite;            //把創建進程的標準錯誤輸出重定向到管道輸入
    si.hStdOutput = hWrite;           //把創建進程的標準輸出重定向到管道輸入
    si.wShowWindow = SW_HIDE;
    si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    //關鍵步驟，CreateProcess函數參數意義請查閱MSDN
    if (!::CreateProcess(NULL, strcmd, NULL, NULL, TRUE, NULL, NULL, NULL, &si, &pi))
    {
        CloseHandle(hWrite);
        CloseHandle(hRead);
        ::CloseHandle(pi.hThread);
        ::CloseHandle(pi.hProcess);
        return false;
    }
    
    CloseHandle(hWrite);
    char buffer[4096] = { 0 };          //用4K的空間來存儲輸出的內容，只要不是顯示文件內容，一般情況下是夠用了。
    DWORD bytesRead;
    while (true)
    {
        if (ReadFile(hRead, buffer, 4095, &bytesRead, NULL) == NULL)
            break;
        //buffer中就是執行的結果，可以保存到文本，也可以直接輸出
        //printf(buffer);   //這裏是彈出對話框顯示
        if (strstr(buffer, "文件損壞或密碼錯誤") || strstr(buffer, "發現文件頭毀損"))
        {
            
            CloseHandle(hRead);
            ::CloseHandle(pi.hThread);
            ::CloseHandle(pi.hProcess);
            return false;
        }
    }

    CloseHandle(hRead);
    ::CloseHandle(pi.hThread);
    ::CloseHandle(pi.hProcess);
    return true;
}


int main(int argc, char* argv[])
{
    //char szCommandLine[] = "Rar.exe a -r -hp123456 \"g:/360Downloads.rar\" \"f:/360Downloads\"";
    char szCommandLine[512] = {} ;

    for (int i = 100000; i < 999999; i++)
    {
        sprintf_s(szCommandLine, 512, "Rar.exe x -hp%u \"g:/360Downloads.rar\" \"F:/test/\"", i);
        if (ExecDosCmd(szCommandLine))
        {
            printf("密碼是:%u\r\n",i);
            break;
        }
    }
    
    
    system("pause");
}