網上有一些Win32 多線程編程示例，多是控制臺版本；下面哥作一個窗口版本；

/*-------------------------------------------------bobo, 2020-------------------------------------------------*/#include <windows.h> #include <windowsx.h>LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; DWORD WINAPI ThreadProc1(HDC); DWORD WINAPI ThreadProc2(HDC);int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,PSTR szCmdLine, int iCmdShow) {static TCHAR szAppName[] = TEXT ("ThreadDemo") ;HWND hwnd ;MSG msg ;WNDCLASS wndclass ;wndclass.style = CS_HREDRAW | CS_VREDRAW ;wndclass.lpfnWndProc = WndProc ;wndclass.cbClsExtra = 0 ;wndclass.cbWndExtra = 0 ;wndclass.hInstance = hInstance ;wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;wndclass.lpszMenuName = NULL ;wndclass.lpszClassName = szAppName ;if (!RegisterClass (&wndclass)){MessageBox (NULL, TEXT ("Program requires Windows NT!"), szAppName, MB_ICONERROR) ;return 0 ;}hwnd = CreateWindow (szAppName, TEXT ("ThreadDemo"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, CW_USEDEFAULT,CW_USEDEFAULT, CW_USEDEFAULT,NULL, NULL, hInstance, NULL) ;ShowWindow (hwnd, iCmdShow) ;UpdateWindow (hwnd) ;while (GetMessage (&msg, NULL, 0, 0)){TranslateMessage (&msg) ;DispatchMessage (&msg) ;}return msg.wParam ; }LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {HDC hdc ;int x, y ;PAINTSTRUCT ps ;RECT rect ;char buffer[65];HANDLE hThread1, hThread2;switch (message){case WM_CREATE:return 0;case WM_SIZE :return 0 ;case WM_RBUTTONDOWN :return 0;case WM_LBUTTONDOWN :hdc = GetDC(hwnd);hThread1 = CreateThread(NULL, NULL, ThreadProc1, hdc, NULL, NULL);hdc = GetDC(hwnd);hThread2 = CreateThread(NULL, NULL, ThreadProc2, hdc, NULL, NULL);WaitForSingleObject(hThread1, INFINITE);WaitForSingleObject(hThread2, INFINITE);TextOut(hdc, 500, 20, TEXT("我是主線程"), 5);return 0 ;case WM_PAINT :hdc = BeginPaint (hwnd, &ps) ;EndPaint (hwnd, &ps) ;return 0 ;case WM_DESTROY :PostQuitMessage (0) ;return 0 ;}return DefWindowProc (hwnd, message, wParam, lParam) ; }DWORD WINAPI ThreadProc1(HDC hdc) {for (int i = 0; i < 10; i++){TextOut(hdc, 100, 20+i*25, TEXT("我是子線程1"), 6);}return 0; }DWORD WINAPI ThreadProc2(HDC hdc) {TextOut(hdc, 300, 20, TEXT("我是子線程2"), 6);return 0; }

按照多線程原理，三個（主，2個子）線程的輸出是同步的；

程序要點如下；

在單個的C文件里面；2個線程函數必須預先聲明；

DWORD WINAPI ThreadProc1(HDC);
DWORD WINAPI ThreadProc2(HDC);

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線程句柄；創建成功之后返回；

HANDLE hThread1, hThread2;

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TextOut輸出，中文使用TEXT()宏；字符長度漢字也按一個；

TextOut(hdc, 500, 20, TEXT("我是主線程"), 5);

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WaitForSingleObject(hThread1, INFINITE);

同步；C#里面應該封裝為CMutex之類的類了，記不清了；INFINITE，無限；

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注意給線程2傳遞hdc，要再獲取一次hdc，否則線程2不會得到hdc能輸出；出了本線程要再獲取一次；

見此；

https://blog.csdn.net/bcbobo21cn/article/details/103739479

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20+i*25；

每次輸出增加Y坐標25；默認字體大約高為20像素，具體記不清了；

總結

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