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beginthread
鎖定
_beginthread,VC/VC++函數,創建一個線程。
- 中文名
- _beginthread
- 外文名
- _beginthread
- 頭文件
- process.h
- 應用學科
- VC/VC++
beginthread頭文件
#include <process.h>
beginthread基本信息
函數創建一個線程。
uintptr_t _beginthread( void( *start_address )( void * ), unsigned stack_size, void *arglist );
返回值:
假如成功,函數將會返回一個新線程的句柄,用户可以像這樣聲明一個句柄變量存儲返回值:
HANDLE hStdOut = _beginthread( CheckKey, 0, NULL )。如果失敗_beginthread將返回-1。
start_address
新線程的起始地址 ,指向新線程調用的函數的起始地址
stack_size
新線程的堆棧大小,可以為0
arglist
傳遞給線程的參數列表,無參數時為NULL
所在庫文件:
#include <process.h>
beginthread示例
// crt_BEGTHRD.C // compile with: /MT /D "_X86_" /c // processor: x86 #include <windows.h> #include <process.h> /* _beginthread, _endthread */ #include <stddef.h> #include <stdlib.h> #include <conio.h> void Bounce( void *ch ); void CheckKey( void *dummy ); /* GetRandom returns a random integer between min and max. */ #define GetRandom( min, max ) ((rand() % (int)(((max) + 1) - (min))) + (min)) BOOL repeat = TRUE; /* Global repeat flag and video variable */ HANDLE hStdOut; /* Handle for console window */ CONSOLE_SCREEN_BUFFER_INFO csbi; /* Console information structure */ int main() { CHAR ch = 'A'; hStdOut = GetStdHandle( STD_OUTPUT_HANDLE ); /* Get display screen's text row and column information. */ GetConsoleScreenBufferInfo( hStdOut, &csbi ); /* Launch CheckKey thread to check for terminating keystroke. */ _beginthread( CheckKey, 0, NULL ); /* Loop until CheckKey terminates program. */ while( repeat ) { /* On first loops, launch character threads. */ _beginthread( Bounce, 0, (void *) (ch++) ); /* Wait one second between loops. */ Sleep( 1000L ); } } /* CheckKey - Thread to wait for a keystroke, then clear repeat flag. */ void CheckKey( void *dummy ) { _getch(); repeat = 0; /* _endthread implied */ } /* Bounce - Thread to create and and control a colored letter that moves * around on the screen. * * Params: ch - the letter to be moved */ void Bounce( void *ch ) { /* Generate letter and color attribute from thread argument. */ char blankcell = 0x20; char blockcell = (char) ch; BOOL first = TRUE; COORD oldcoord, newcoord; DWORD result; /* Seed random number generator and get initial location. */ srand( _threadid ); newcoord.X = GetRandom( 0, csbi.dwSize.X - 1 ); newcoord.Y = GetRandom( 0, csbi.dwSize.Y - 1 ); while( repeat ) { /* Pause between loops. */ Sleep( 100L ); /* Blank out our old position on the screen, and draw new letter. */ if( first ) first = FALSE; else WriteConsoleOutputCharacter( hStdOut, &blankcell, 1, oldcoord, &result ); WriteConsoleOutputCharacter( hStdOut, &blockcell, 1, newcoord, &result ); /* Increment the coordinate for next placement of the block. */ oldcoord.X = newcoord.X; oldcoord.Y = newcoord.Y; newcoord.X += GetRandom( -1, 1 ); newcoord.Y += GetRandom( -1, 1 ); /* Correct placement (and beep) if about to go off the screen. */ if( newcoord.X < 0 ) newcoord.X = 1; else if( newcoord.X == csbi.dwSize.X ) newcoord.X = csbi.dwSize.X - 2; else if( newcoord.Y < 0 ) newcoord.Y = 1; else if( newcoord.Y == csbi.dwSize.Y ) newcoord.Y = csbi.dwSize.Y - 2; /* If not at a screen border, continue, otherwise beep. */ else continue; Beep( ((char) ch - 'A') * 100, 175 ); } /* _endthread given to terminate */ _endthread(); }
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