The CreateThread function creates a new thread for a process. The creating thread must specify the starting address of the code that the new thread is to execute. Typically, the starting address is the name of a function defined in the program code (for more information, see ThreadProc). This function takes a single parameter and returns a DWORD value. A process can have multiple threads simultaneously executing the same function.
CreateThread
函數從一個進程里面創建一個線程。這個開始的線程必須指定開始執行代碼的地址，新線程執行。有代表性的，開始地址就是一個函數名。這個函數有一個參數，并且返回一個
DWORD
值。一個進程里面同時有多個線程在執行。
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The following is a simple example that demonstrates how to create a new thread that executes the locally defined function, ThreadProc. The creating thread uses a dynamically allocated buffer to pass unique information to each instance of the thread function. It is the responsibility of the thread function to free the memory.
下面這個例子演示如何創建一個新線程，執行本地定義的函數。
ThreadProc.
建立的線程動態分配內存傳遞信息到每個線程的實例中。線程函數負責釋放這些內存。
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The calling thread uses the WaitForMultipleObjects function to persist until all worker threads have terminated. Note that if you were to close the handle to a worker thread before it terminated, this does not terminate the worker thread. However, the handle will be unavailable for use in subsequent function calls.
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被調用的線程用
WaitForMultipleObjects
持續等待，知道所有的工作線程退出。在線程退出后，關掉線程函數的句柄。
#include <windows.h>
#include <strsafe.h> //win2003 SDK必須安裝 要不無此頭文件。此文件是為了實現StringCchPrintf，StringCchLength。
#define MAX_THREADS 3
#define BUF_SIZE 255
typedef struct _MyData {
??? int val1;
??? int val2;
} MYDATA, *PMYDATA;
DWORD WINAPI ThreadProc( LPVOID lpParam )
{
??? HANDLE hStdout;
??? PMYDATA pData;
??? TCHAR msgBuf[BUF_SIZE];
??? 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\n"),
??????? pData->val1, pData->val2);
??? StringCchLength(msgBuf, BUF_SIZE, &cchStringSize);
??? WriteConsole(hStdout, msgBuf, cchStringSize, &dwChars, NULL);
??? // Free the memory allocated by the caller for the thread
??? // data structure.
??? HeapFree(GetProcessHeap(), 0, pData);
??? return 0;
}
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void main()
{
??? PMYDATA pData;
??? DWORD dwThreadId[MAX_THREADS];
??? HANDLE hThread[MAX_THREADS];
??? int i;
??? // Create MAX_THREADS worker threads.
??? for( i=0; i<MAX_THREADS; i++ )
??? {
??????? // Allocate memory for thread data.
??????? pData = (PMYDATA)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
??????????????? sizeof(MYDATA));
????//5);
??????? if( pData == NULL )
??????????? ExitProcess(2);
??????? // Generate unique data for each thread.
??????? pData->val1 = i;
??????? pData->val2 = i+100;
??????? hThread[i] = CreateThread(
??????????? NULL,????????????? // default security attributes
??????????? 0,???????????????? // use default stack size?
??????????? ThreadProc,??????? // thread function
??????????? pData,???????????? // argument to thread function
??????????? 0,???????????????? // use default creation flags
??????????? &dwThreadId[i]);?? // returns the thread identifier
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??????? // Check the return value for success.
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??????? if (hThread[i] == NULL)
??????? {
??????????? ExitProcess(i);
??????? }
??? }
??? // Wait until all threads have terminated.
??? WaitForMultipleObjects(MAX_THREADS, hThread, TRUE, INFINITE);
??? // Close all thread handles upon completion.
??? for(i=0; i<MAX_THREADS; i++)
??? {
??????? CloseHandle(hThread[i]);
??? }
}