使用C++绘制GDI位图的基本编写实例

1、加载位图

2、建立兼容DC

3、选择之前的位图对象

4、用贴图函数BitBlt()

HBITMAP bitmap=(HBITMAP)LoadImage(NULL,L"Name.bmp",IMAGE_BITMAP,high,length,LR_LOADFROMFILE);
HWND tmp=CreateCompatiable(g_hdc);
SelectObject(tmp,bitmap);
BitBlt(g_hdc,0,0,high,length,tmp,0,0,SRCCOPY);

Demo完整代码:

#include <windows.h>
#include <time.h> 

const int TAR_HIGH=800;
const int TAR_WEIGHT=600;
const wchar_t TAR_TITLE[]=L"致我们不磨灭的青春和理想-建大英雄传"; 

HDC g_hdc=NULL;
HDC g_mdc=NULL;
HBITMAP g_hbitmap=NULL; 

void Game_Paint(HWND hwnd)
{
  SelectObject(g_mdc,g_hbitmap);
  BitBlt(g_hdc,0,0,TAR_HIGH,TAR_WEIGHT,g_mdc,0,0,SRCCOPY);
} 

bool Game_Init(HWND hwnd)
{
  g_hdc=GetDC(hwnd);
  //在这里做初始化工作
  g_hbitmap=(HBITMAP)LoadImage(NULL,L"content.bmp",IMAGE_BITMAP,TAR_HIGH,TAR_WEIGHT,LR_LOADFROMFILE);
  //建立DC
  g_mdc=CreateCompatibleDC(g_hdc); 

  Game_Paint(hwnd);
  ReleaseDC(hwnd,g_hdc);
  return 1;
} 

bool Game_Clear(HWND hwnd)
{
  DeleteObject(g_hbitmap);
  DeleteDC(g_mdc);
  return 1;
} 

LRESULT CALLBACK SdjzuProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
  switch(message)
  {
    PAINTSTRUCT paintstruct;
  case WM_PAINT:
    //新增设备环境句柄调用
    g_hdc=BeginPaint(hwnd,&paintstruct);
    Game_Init(hwnd);
    EndPaint(hwnd,&paintstruct);
    ValidateRect(hwnd,NULL);
    break;
    case WM_KEYDOWN:
      if(wParam=VK_ESCAPE)
      DestroyWindow(hwnd);
      break;
  case WM_DESTROY:
    PostQuitMessage(0);
    break;
  default:
    return DefWindowProc(hwnd,message,wParam,lParam);
  }
  return 0;
} 

int WINAPI WinMain( __in HINSTANCE hInstance, __in_opt HINSTANCE hPrevInstance, __in LPSTR lpCmdLine, __in int nShowCmd )
{
  WNDCLASSEX wndclass={0};
  wndclass.cbSize=sizeof(WNDCLASSEX);
  wndclass.style=CS_HREDRAW|CS_VREDRAW;
  wndclass.lpfnWndProc=SdjzuProc;
  wndclass.cbClsExtra=0;
  wndclass.cbWndExtra=0;
  wndclass.hInstance=hInstance;
  wndclass.hIcon=(HICON)::LoadImage(NULL,L"tarico.ico",IMAGE_ICON,0,0,LR_DEFAULTSIZE|LR_LOADFROMFILE);
  wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
  wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
  wndclass.lpszMenuName=NULL;
  wndclass.lpszClassName=L"sdjzuhero"; 

  //注册窗口 

  if(!RegisterClassEx(&wndclass))
    return -1;
  HWND hwnd=CreateWindow(L"sdjzuhero",TAR_TITLE,WS_OVERLAPPED|WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX,CW_USEDEFAULT,CW_USEDEFAULT,TAR_HIGH,TAR_WEIGHT,NULL,NULL,hInstance,NULL);//第三个参数控制了窗口的样式，合集为WS_OVERLAPPEDWINDOW
  MoveWindow(hwnd,250,80,TAR_HIGH,TAR_WEIGHT,true);
  ShowWindow(hwnd,nShowCmd);
  UpdateWindow(hwnd); 

  //载入报错模块 

  MSG msg={0};
  while(msg.message!=WM_QUIT)
  {
    if(PeekMessage(&msg,0,0,0,PM_REMOVE))
    {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
    }
  } 

  UnregisterClass(L"sdjzuhero",wndclass.hInstance); 

  return 0;
}

刚开始试了几次没有成功，发现是在WndProc里对函数的调用出错了，没有执行init部分，改成init之后问题解决。看来与ACM一样，不能唯别人的模板是从，还是应该理解后加以修改，以更好的利用。