win32 连接图片
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win32连接图片原理:
将图片1写入到一个 内存位置,将图片2写到另一个内存位置,然后新建一个新的足以容纳这2张图片的内存,分别将2个图片,依次拷贝到较大的新的内存位置.
先来看看代码:
/*----------------------------------------BRICKS1.C -- LoadBitmap Demonstration(c) Charles Petzold, 1998----------------------------------------*/#include <windows.h>LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,PSTR szCmdLine, int iCmdShow){static TCHAR szAppName [] = TEXT ("Bricks1") ;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.hbrBackground = NULL ;wndclass.lpszMenuName = NULL ;wndclass.lpszClassName = szAppName ;if (!RegisterClass (&wndclass)){MessageBox (NULL, TEXT ("This program requires Windows NT!"),szAppName, MB_ICONERROR) ;return 0 ;}hwnd = CreateWindow (szAppName, TEXT ("LoadBitmap Demo"), 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){static HBITMAP hBitmap,hBitmap2,memBM ;static int cxClient, cyClient, cxSource, cySource,cxSource2, cySource2 ;BITMAP bitmap,bitmap2 ;static HDC hdc, hdcMem = NULL,hdcMem2 ,hdcMem3;static HINSTANCE hInstance ;// HBITMAP memBM;// Getwindowsstatic int x = -10, y = 0,x2 = 0,m_x = 0;static int xfirst ;static int xsecond;PAINTSTRUCT ps ;POINT MousePointFirst;POINT MousePointSecond;RECT ClientRect;static BOOL sign = TRUE; static BOOL Isfirst = TRUE;switch (message){case WM_CREATE:hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;hBitmap = LoadBitmap (hInstance, TEXT ("IDB_BITMAP5")) ;hBitmap2 = LoadBitmap (hInstance,TEXT("IDB_BITMAP3"));// hdcMem = CreateCompatibleDC (hdc) ;//hdcMem2 = CreateCompatibleDC (hdc) ;//hdcMem3 = CreateCompatibleDC (hdc) ;//SelectObject(hdcMem,hBitmap);//SelectObject(hdcMem2,hBitmap2);// GetObject (hBitmap, sizeof (BITMAP), &bitmap) ;//GetObject (hBitmap2, sizeof (BITMAP), &bitmap2) ;// cxSource = bitmap.bmWidth ;// cySource = bitmap.bmHeight ;//cxSource2 = bitmap2.bmWidth ;//cySource2 = bitmap2.bmHeight ;//memBM = CreateCompatibleBitmap(hdc,cxSource*2,cySource);//SelectObject(hdcMem3,memBM);//BitBlt(hdcMem3,0,0,cxSource,cySource,hdcMem,0,0,SRCCOPY);//DeleteDC(hdcMem);//BitBlt(hdcMem3,cxSource,0,cxSource2,cySource2,hdcMem2,0,0,SRCCOPY);//DeleteDC(hdcMem2);return 0 ;case WM_SIZE:cxClient = LOWORD (lParam) ;cyClient = HIWORD (lParam) ;// x2 = 0;return 0 ;case WM_PAINT:hdc = BeginPaint (hwnd, &ps) ;if(sign == TRUE){hdcMem = CreateCompatibleDC (hdc) ;hdcMem2 = CreateCompatibleDC (hdc) ;hdcMem3 = CreateCompatibleDC (hdc) ;SelectObject(hdcMem,hBitmap);SelectObject(hdcMem2,hBitmap2);GetObject (hBitmap, sizeof (BITMAP), &bitmap) ;GetObject (hBitmap2, sizeof (BITMAP), &bitmap2) ;cxSource = bitmap.bmWidth ;cySource = bitmap.bmHeight ;cxSource2 = bitmap2.bmWidth ;cySource2 = bitmap2.bmHeight ;memBM = CreateCompatibleBitmap(hdc,cxSource+cxSource2,cySource);SelectObject(hdcMem3,memBM);BitBlt(hdcMem3,0,0,cxSource,cySource,hdcMem,0,0,SRCCOPY);DeleteDC(hdcMem);BitBlt(hdcMem3,cxSource,0,cxSource2,cySource2,hdcMem2,0,0,SRCCOPY);DeleteDC(hdcMem2);BitBlt(hdc,0,0,cxSource+cxSource2,cySource,hdcMem3,cxSource,0,SRCCOPY);}else{m_x += 100;hdcMem = CreateCompatibleDC (hdc) ;hdcMem2 = CreateCompatibleDC (hdc) ;hdcMem3 = CreateCompatibleDC (hdc) ;SelectObject(hdcMem,hBitmap);SelectObject(hdcMem2,hBitmap2);GetObject (hBitmap, sizeof (BITMAP), &bitmap) ;GetObject (hBitmap2, sizeof (BITMAP), &bitmap2) ;cxSource = bitmap.bmWidth ;cySource = bitmap.bmHeight ;cxSource2 = bitmap2.bmWidth ;cySource2 = bitmap2.bmHeight ;memBM = CreateCompatibleBitmap(hdc,cxSource+cxSource2,cySource);SelectObject(hdcMem3,memBM);BitBlt(hdcMem3,0,0,cxSource,cySource,hdcMem,0,0,SRCCOPY);DeleteDC(hdcMem);BitBlt(hdcMem3,cxSource,0,cxSource2,cySource2,hdcMem2,0,0,SRCCOPY);DeleteDC(hdcMem2);if(x >= cxSource ){BitBlt(hdc,0,0,cxSource+cxSource2,cySource,hdcMem3,cxSource,0,SRCCOPY);}else{BitBlt(hdc,0,0,cxSource+cxSource2,cySource,hdcMem3,m_x,0,SRCCOPY);}}DeleteDC (hdcMem3) ;EndPaint (hwnd, &ps) ;return 0 ;case WM_MOUSEMOVE:if(wParam & MK_LBUTTON){sign = FALSE;//GetObject (hBitmap, sizeof (BITMAP), &bitmap) ;//cxSource = bitmap.bmWidth ;//cySource = bitmap.bmHeight ;if(Isfirst == TRUE){x = 0;Isfirst = FALSE;}else{xfirst = xsecond; GetCursorPos(&MousePointSecond);xsecond = MousePointSecond.x;x=xsecond - xfirst;} InvalidateRect(hwnd,NULL,TRUE);}return 0;case WM_LBUTTONUP:sign = FALSE;//if(x2 > 500)//{// x = x2 = 0;// SelectObject (hdcMem, hBitmap2) ;// // BitBlt (hdc, 0, 0, cxSource, cySource, hdcMem, 0, 0, SRCCOPY) ;//}//else//{// x = x2 = 0; // SelectObject (hdcMem, hBitmap); //}InvalidateRect(hwnd,NULL,TRUE);return 0;case WM_DESTROY:DeleteObject (hBitmap) ;PostQuitMessage (0) ;return 0 ;}return DefWindowProc (hwnd, message, wParam, lParam) ;}图片连接的实现,主要是 WM_PAINT里的代码,我们具体来分析一下:
(1)创建一个与指定设备兼容的内存设备上下文环境（DC）
hdcMem = CreateCompatibleDC (hdc) ;
hdcMem2 = CreateCompatibleDC (hdc) ;
hdcMem3 = CreateCompatibleDC (hdc) ;
(2)将hdcMem,hdcMem2,分别关联要进行连接的图片
SelectObject(hdcMem,hBitmap); SelectObject(hdcMem2,hBitmap2);(3)创建一个内存兼容图片,图片的大小应该是2张图片的2倍(看水平,还是垂直),并将兼容图片和hdcMem3关联memBM = CreateCompatibleBitmap(hdc,cxSource+cxSource2,cySource); SelectObject(hdcMem3,memBM);(4)将hdcMem1 hdcMem2,依次拷贝到hdcMem3中,注意,第二次的起始位置,应该是第一次图片的长度BitBlt(hdcMem3,0,0,cxSource,cySource,hdcMem,0,0,SRCCOPY); DeleteDC(hdcMem); BitBlt(hdcMem3,cxSource,0,cxSource2,cySource2,hdcMem2,0,0,SRCCOPY); DeleteDC(hdcMem2);(5)最后将hdcMem3写到窗口的dc,便可以显示出来了哦BitBlt(hdc,0,0,cxSource+cxSource2,cySource,hdcMem3,0,0,SRCCOPY);
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