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微软提供了图形的界面API，叫GDI
如果你想画某个窗口，你必须拿到此窗口的HDC

#include <windows.h>
#include<tchar.h>
#include <stdio.h>
#include <strsafe.h>
#include <string>/*鼠标消息
* 键盘消息
* Onkeydown
* Onkeyup
* //键盘扫描码
* /lParam>>16&0ff
快捷键消息
菜单消息
控件消息
自定义消息
窗口消息
客户区域的概念(Client Aera)
非客户区*/ 
using namespace std;
string g_Text;
VOID showerrormassage()
{LPVOID lpMsgBuf;FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |/*  分别为FORMAT_MESSAGE_ALLOCATE_BUFFER由函数分配输出缓冲区，FORMAT_MESSAGE_FROM_SYSTEM表示程序将会在系统消息表资源中搜索所需消息，FORMAT_MESSAGE_IGNORE_INSERTS程序将会忽略搜索到消息中的插入序列。  */FORMAT_MESSAGE_FROM_SYSTEM |FORMAT_MESSAGE_IGNORE_INSERTS,NULL,GetLastError(),MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),(LPTSTR)&lpMsgBuf,0, NULL);MessageBox(NULL, (LPCTSTR)lpMsgBuf, TEXT("Error"), MB_OK | MB_ICONINFORMATION);LocalFree(lpMsgBuf);
}//热键消息
//热键消息需要注册
//RegisterHotKey()
//软件卸载的时候还要卸载这个注册
//所以ip号就是这么回事
//
//UnregisterHotKey注销的函数//LRESULT OnHotkey(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
//	return TRUE;
//}LRESULT Onchar(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{g_Text+=(char)wParam;TCHAR szBuf[MAXBYTE];if ((char)wParam == '\r'){g_Text += '\n';}wsprintf(szBuf, _T("Onchar %s\n"), g_Text.data());OutputDebugString(szBuf);//获取窗口HDC，非客户区GetWindowDCHDC hdc = GetDC(hwnd);//TextOut(hdc, 0, 0, g_Text.data(), g_Text.length());//这个API不支持回车//释放DCRECT rc;GetClientRect(hwnd, &rc);DrawText(hdc, g_Text.data(), g_Text.length(), &rc, DT_LEFT);//这个API支持换行不过有rectReleaseDC(hwnd, hdc);return TRUE;
}
LRESULT OnCreate(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {//初始化/* MessageBox(NULL,_T("onCrate"), _T("asm"), MB_OK);*/OutputDebugString(_T("[11syy]WM_CREATE\n"));return TRUE;
}//消息处理LRESULT OnClese(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {/*MessageBox(NULL, _T("onClose"), _T("asm"), MB_OK);*/OutputDebugString(_T("[11syy]WM_ClOSE\n"));DestroyWindow(hwnd);return TRUE;
}
//LRESULT OnKeydown(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
//{
//	//获取键盘状态
//	BYTE KeyState[256];
//	if (!GetKeyboardState(KeyState))
//	{
//		return TRUE;
//	}
//
//	//键盘扫描码
//	BYTE SanCode = (UINT)lParam >> 16 & 0xff;
//	WORD ch;
//	ToAscii(wParam, SanCode, KeyState, &ch, 0);
//	TCHAR szBuf[MAXBYTE];
//	wsprintf(szBuf, _T("[asm] OnKeydown) % c\n"), ch);
//	OutputDebugString(szBuf);
//	return TRUE;
//}//消息处理LRESULT OnDestroy(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{/*  MessageBox(NULL, _T("onDestory"), _T("asm"), MB_OK);*/PostMessage(hwnd, WM_QUIT, 0, NULL);OutputDebugString(_T("[11syy]WM_DESTROY\n"));return TRUE;
}//LRESULT OnMove(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
//{
//	TCHAR szBuf[MAXBYTE];
//	int xpos = (int)(short)LOWORD(lParam);
//	int ypos = (int)(short)HIWORD(lParam);
//	wsprintf(szBuf, _T("[11syy]xpos:%d ypos:%d"), xpos, ypos);
//	PostMessage(hwnd, WM_QUIT, 0, NULL);
//	return TRUE;
//}
//LRESULT OnLButtonnDown(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
//{
//	int xpos = LOWORD(lParam);
//	int ypos = HIWORD(lParam);
//	TCHAR szBuf[MAXBYTE];
//	wsprintf(szBuf, _T("[11syy]xpos:%d ypos:%d\n"), xpos, ypos);
//	OutputDebugString(szBuf);
//	/*MessageBox(NULL, szBuf, _T("asm"), MB_OK);*/
//	return FALSE;
//}
//LRESULT OnLButtonnup(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
//{
//	int xpos = LOWORD(lParam);
//	int ypos = HIWORD(lParam);
//	TCHAR szBuf[MAXBYTE];
//	wsprintf(szBuf, _T("[11syy]xpos:%d ypos:%d\n"), xpos, ypos);
//	OutputDebugString(szBuf);
//	//MessageBox(NULL, szBuf, _T("asm"), MB_OK);
//	return FALSE;
//}//LRESULT onMouse(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
//{
//	LRESULT lResult = FALSE;
//	switch (uMsg)
//	{
//	case WM_LBUTTONDOWN:
//	 lResult= OnLButtonnDown(hwnd, uMsg, wParam, lParam);
//		break;
//	}
//	return FALSE;
//}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {LRESULT lResult = FALSE;switch (uMsg){case WM_CREATE:lResult = OnCreate(hwnd, uMsg, wParam, lParam);break;case WM_CLOSE:lResult = OnClese(hwnd, uMsg, wParam, lParam);break;case WM_DESTROY:lResult = OnDestroy(hwnd, uMsg, wParam, lParam);break;case WM_CHAR:lResult= Onchar(hwnd, uMsg, wParam, lParam);}if (!lResult) {return DefWindowProc(hwnd, uMsg, wParam, lParam);//默认窗口过程处理}return lResult;
}//图形界面，窗口int WINAPI _tWinMain(HINSTANCE hInstance,//应用程序示例句柄HINSTANCE hPrevInstance,//保留TCHAR* lpCmdline, //命令行参数，LPSTR可能会变成Unicodeint nCmdShow) {//窗口显示方式//比如我们启动这个窗口，最大化，最小化/*MessageBoxA(NULL, "hell word ", "asm", MB_YESNO);*/\//int res = MessageBoxW(NULL, L"hell unicode", L"asm", MB_YESNO);////if (res == 0) {///*	MessageBoxW(NULL, L"错误", L"asm", MB_OK);*///	showerrormassage();//	return 0;//}程序》实例化》进程》多个窗口//1.注册窗口TCHAR  szWndclassName[] = { _T("chongmousyy") };WNDCLASSEX wc = { 0 };wc.cbSize = sizeof(WNDCLASSEX);wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;//窗口类型wc.lpfnWndProc = WindowProc;wc.hInstance = hInstance;wc.hIcon = LoadIcon(NULL, IDC_HAND);//图标wc.hCursor = LoadCursor(NULL, IDC_ARROW);//光标FDXXwc.hbrBackground = CreateSolidBrush(RGB(255, 255, 255));//窗口背景颜色刷子wc.lpszClassName = szWndclassName;//窗口类名,窗口名字不可以为空wc.lpszMenuName = NULL;//窗口菜单if (RegisterClassEx(&wc) == 0){showerrormassage();return 0;};//2.创建窗口TCHAR szWndName[] = { _T("翀某人") };HWND hwnd = CreateWindowEx(0,szWndclassName,szWndName,WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);if (hwnd == 0){showerrormassage();return 0;}//3.显示跟新窗口ShowWindow(hwnd, SW_SHOWNORMAL);//4.消息循环（消息队列)BOOL bRET;MSG msg;while ((bRET = GetMessage(&msg, NULL, 0, 0)) != 0) {if (bRET == -1) {break;}else{//转发消息TranslateMessage(&msg);//转换键盘消息为字符消息DispatchMessage(&msg);//派发消息}}//5.消息处理//资源return 0;
}