Win API:之GetCurrentThread、GetCurrentThreadId、GetCurrentProcess、GetCurrentProcessId

　{返回当前线程的虚拟句柄} GetCurrentThread: THandle;
　{返回当前线程 ID} GetCurrentThreadId: DWORD;
　{返回当前进程的虚拟句柄} GetCurrentProcess: THandle;
　{返回当前进程 ID} GetCurrentProcessId: DWORD;

　　提示:
　　ID 是系统唯一的标识.
　　所谓虚拟句柄, 就是该句柄只在调用进程的进程中有效, 也不能被继承;
　　如果用于其他进程需要用 DuplicateHandle 复制句柄;
　　GetCurrentProcess 返回的虚拟句柄可以通过 OpenProcess 创建一个真实的句柄.

 C++ Code 

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#include <iostream>
#include <Windows.h>
#include <process.h>
#include <tchar.h>
#include <strsafe.h>

#define BUF_SIZE 255

typedef struct MyData {
    int nVal1;
    int nVal2;
} MYDATA, *PMYDATA;

using namespace std;

DWORD WINAPI MyThread( LPVOID lpParam );

int main(void)
{
    HANDLE hProcess = NULL;
    DWORD dwProcessId = 0;
    HANDLE hThread = NULL;
    DWORD dwThreadId = 0;
    PMYDATA pData;

    hProcess = GetCurrentProcess(); //进程伪句柄
    cout << "The Current Process Pseudo Handle is " << hProcess << endl;
    DuplicateHandle(GetCurrentProcess(),
        GetCurrentProcess(),
        GetCurrentProcess(),
        &hProcess,
        0,
        FALSE,
        DUPLICATE_SAME_ACCESS
        );
    cout << "The Current Process Real Handle is " << hProcess << endl;
    dwProcessId = GetCurrentProcessId();
    cout << "The Current Process Id is " << dwProcessId << endl;

    // Allocate memory for thread data.
    pData = (PMYDATA) HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(MYDATA));

    if( pData == NULL )
    {
        ExitProcess(2);
    }
    // Generate unique data for each thread.
    pData->nVal1 = 1;
    pData->nVal2 = 100;
    // Create Thread
    hThread = CreateThread( NULL,               // default security attributes
                            0,                  // use default stack size
                            MyThread,           // thread function
                            pData,              // argument to thread function
                            0,                  // use default creation flags
                            &dwThreadId);       // returns the thread identifier

    cin.get();
    return 0;
}

DWORD WINAPI MyThread( LPVOID lpParam )
{
    HANDLE hThread = NULL;
    DWORD dwThreadId = 0;
    hThread = GetCurrentThread();   //线程伪句柄
    cout << "The Current Thread Pseudo Handle is " << hThread << endl;
    DuplicateHandle(GetCurrentProcess(),
        GetCurrentThread(),
        GetCurrentProcess(),
        &hThread,
        0,
        FALSE,
        DUPLICATE_SAME_ACCESS
        );
    cout << "The Current Thread Real Handle is " << hThread << endl;
    dwThreadId = GetCurrentThreadId();
    cout << "The Current Thread Id is " << dwThreadId << endl;

    HANDLE hStdout;
    PMYDATA pData;

    TCHAR msgBuf[BUF_SIZE] = {0};
    size_t cchStringSize;
    DWORD dwChars;

    hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
    if( hStdout == INVALID_HANDLE_VALUE )
        return 1;

    // Cast the parameter to the correct data type.
    pData = (PMYDATA)lpParam;

    // Print the parameter values using thread-safe functions.
    StringCchPrintf(msgBuf,
                    BUF_SIZE,
                    TEXT("Parameters = %d, %d "),
                    pData->nVal1,
                    pData->nVal2);
    StringCchLength(msgBuf, BUF_SIZE, &cchStringSize);
    WriteConsole(hStdout, msgBuf, cchStringSize, &dwChars, NULL);

    return 0;

}

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原文地址：https://www.cnblogs.com/MakeView660/p/7755374.html