闲来无事练习题基础知识

闲来无事练习基础知识1、创建进程：STARTUPINFO si si.cb sizeof(si) memset(&si,0,sizeof(si))PROCES

闲来无事练习基础知识

1、创建进程：

    STARTUPINFO si  ; si.cb = sizeof(si); memset(&si,0,sizeof(si));    PROCESS_INFORMATION  pi;    si.wShowWindow = TRUE;    BOOL bRet = CreateProcess(NULL,"notepad.exe",NULL,NULL,FALSE,NULL,NULL,NULL,&si,&pi);     if (bRet)    {        CString str;        str.Format("%d",pi.dwThreadId);    }

2、列举进程

    PROCESSENTRY32  pe32;    pe32.dwSize = sizeof(pe32);    HANDLE hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);    if (hProcessSnap == INVALID_HANDLE_VALUE)    {        sprintf("%s\n","创建快照失败！");        return ;    }    BOOL bMore = ::Process32First(hProcessSnap,&pe32);           while(bMore)    {        bMore = Process32Next(hProcessSnap,&pe32);        sprintf(" 进程名称：%s  进程ID：%d;",pe32.szExeFile,pe32.th32ProcessID);             }    ::CloseHandle(hProcessSnap);    return ;

3、时间

    struct tm  *pstr;    time_t t;    t =  time(NULL);    pstr = localtime(&t);    int yyyy = (pstr->tm_year) + 1900; // 年份是从1900开始    int mm   = (pstr->tm_mon) + 1;  // 月是从0-11,所以要加1    int dd   = (pstr->tm_mday) ; // 日是从1 开始    printf("%d年%d月%d日",yyyy,mm,dd);

4、显示关机对话框

typedef int (CALLBACK *SHUTDOWNDLG)(int); //显示关机对话框函数的指针    HINSTANCE hInst = LoadLibrary("shell32.dll"); //装入shell32.dll    SHUTDOWNDLG ShutDownDialog; //指向shell32.dll库中显示关机对话框函数的指针    if(hInst != NULL)    {        //获得函数的地址并调用之        ShutDownDialog = (SHUTDOWNDLG)GetProcAddress(hInst,(LPSTR)60);                (*ShutDownDialog)(0);    }

5、结构体指针数组

#include <stdio.h>#include <string.h>#include <malloc.h>#include <memory.h>// 定义结构体typedef struct tag_STUDENT {    char name[120];    int  ID;    int  age;}STUDENT,*LPSTUDENT;// 函数声明void  outputfun(LPSTUDENT pStu[3]);void  setdatafun() ; // 自定义void  setdatafun() {    char *str = "*** 夜深人静，此情此刻我心依然 ! ***";    int i = 2;    LPSTUDENT stu[3];        for (i=2; i>=0;i--)    {        stu[i] = (LPSTUDENT)malloc(sizeof(tag_STUDENT));        memset(stu[i],0,sizeof(tag_STUDENT));                stu[i]->age = 1008611 + i;        stu[i]->ID  = 181 + i;        memset(stu[i]->name,0,sizeof(stu[i]->name));        strcpy(stu[i]->name,str);    }        //  把 i 个 指针数组 传进去outputfun函数     outputfun(stu);    for (i=2; i>=0;i--)    {        free(stu[i]);    }} ////////////////////////////////////////////////////////////////////////////  结构体指针数组，LPSTUDENT pStu[3] 表示pStu指向3个都为LPSTUDENT类型指针的数组。void outputfun(LPSTUDENT pStu[3]){    LPSTUDENT lpstu[3];     int i;    for (i=0; i<3; i++)    {        lpstu[i] = (LPSTUDENT)malloc(sizeof(tag_STUDENT));// 申请空间        memset(lpstu[i],0,sizeof(tag_STUDENT)); // 内存清零        memcpy(lpstu[i],pStu[i],sizeof(tag_STUDENT));// 数组复制                printf("%s\n","  ");        printf("===============第 %d 个数组=========\n",i+1);        printf("age = %d\n",lpstu[i]->age);        printf("ID = %d\n",lpstu[i]->ID );        printf("name = %s\n",lpstu[i]->name);        // 释放内存空间        free(lpstu[i]);    }    }int main(int argc, char* argv[]){    setdatafun() ;return 0;}

闲来无事 练习题基础知识

闲来无事练习题基础知识