wince 创建了一个窗口显示图片，为啥显示不出来
void DrawImage(HDC hdc,const void *buffer,UINT size,LPCRECT rect)
{
IImagingFactory *pImageFactory=NULL;
IImage *pImage=NULL;
CoInitializeEx(NULL,COINIT_MULTITHREADED);
if(SUCCEEDED(CoCreateInstance(CLSID_ImagingFactory,NULL,CLSCTX_INPROC_SERVER,IID_IImagingFactory,(void**)&pImageFactory)))
{
if(SUCCEEDED(pImageFactory->CreateImageFromBuffer(buffer,size,DISPOSAL_NONE,&pImage)))
{
pImage->Draw(hdc,rect,NULL);
pImage->Release();
}
pImageFactory->Release();
}
CoUninitialize();
}
//LoadResourceImage函数主要将图片导入内存，使用这个函数，只要将图片的ID，图片的类名，以及要显示图片的坐标位置输入即可.
void LoaResourceImage(HWND hwnd,LPCWSTR lpName,LPCWSTR lpType,int i,int left,int right,int bottom,int top)
{
HDC hdc;
HRSRC hr;
DWORD dwsize;
HGLOBAL hg;
LPSTR lp;
HMODULE hModule_Current=GetModuleHandle(NULL);
hr=FindResource(hModule_Current,lpName,lpType);
dwsize=SizeofResource(GetModuleHandle(NULL),hr);
hg=LoadResource(GetModuleHandle(NULL),hr);
lp=(LPSTR)LockResource(hg);
hdc=GetDC(hwnd);
RECT rect;
rect.bottom = bottom;
rect.top = top;
rect.right = right;
rect.left = left;
DrawImage(hdc,lp,dwsize,&rect);
DeleteObject(hr);
}
// 此代码模块中包含的函数的前向声明:
ATOMMyRegisterClass(HINSTANCE, LPTSTR);
BOOLInitInstance(HINSTANCE, int);
LRESULT CALLBACKWndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACKAbout(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
MSG msg;
WNDCLASS wc;
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MYTEST));
wc.hCursor = 0;
wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
wc.lpszMenuName = 0;
wc.lpszClassName = szWindowClass;
HWND hWnd = CreateWindow(szWindowClass, NULL, WS_VISIBLE,
0,0,Screen_width, Screen_height, NULL, NULL, hInstance, NULL);
SetWindowPos(hWnd,HWND_TOPMOST,0,0,Screen_width,Screen_height,SWP_SHOWWINDOW|SWP_NOSIZE|SWP_NOMOVE);
LoaResourceImage(hWnd,MAKEINTRESOURCE(IDM_IMAGE),RT_BITMAP,0,0,0,412,475);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, SW_SHOW);
UpdateWindow(hWnd);
// 主消息循环:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
static int cxChar=0,cyChar=0;
HBRUSH brush;
HWND btnhwnd1,btnhwnd2,btnhwnd3;
static int i=0;
RECT rect={10,10,30,30};
switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// 分析菜单选择:
switch (wmId)
{
case IDM_HELP_ABOUT:
DialogBox(g_hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, About);
break;
case IDM_FILE_EXIT:
DestroyWindow(hWnd);
break;
case IDC_PUSHBTN3:
SendMessage(hWnd,WM_CLOSE,0,0);
memset(HWpotArr,0,MAX_POINTNUM);
break;
case IDC_PUSHBTN2:
InvalidateRect(hWnd,NULL,TRUE);
memset(HWpotArr,0,MAX_POINTNUM);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_CREATE:
LoaResourceImage(hWnd,MAKEINTRESOURCE(IDM_IMAGE),RT_BITMAP,0,0,0,Screen_height,Screen_width);break;
case WM_DESTROY:
CommandBar_Destroy(g_hWndCommandBar);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
程序编译通过 为什么不显示呢
[解决办法]
// Handler for drawingvoid OnDraw(HWND hWnd){ PAINTSTRUCT ps; HDC hdc, hdcMem, hdcNew; HBITMAP hBmp; HBRUSH hBr; int dstX, dstY, i, offset; RECT rt, rtmp; hdc = BeginPaint(hWnd, &ps); GetClientRect(hWnd, &rt); // First draw the colored bars in the upper part of the window that serve as // the starting bitmap to rotate offset = (rt.right - rt.left - 200) / 2; rtmp.left = offset; rtmp.right = offset + 1; rtmp.top = 0; rtmp.bottom = 200; for (i = 0; i < 200; i++) { hBr = CreateSolidBrush(RGB(i * 8 % 255, i * 5 % 255, i * 2 % 255)); FillRect(hdc, &rtmp, hBr); DeleteObject(hBr); rtmp.left++; rtmp.right++; } // BitBlt the starting Bitmap into a memory HDC hdcNew = CreateCompatibleDC(hdc); hBmp = CreateCompatibleBitmap(hdc, 200,200); SelectObject(hdcNew, hBmp); BitBlt(hdcNew, 0, 0, 200, 200, hdc, (rt.right - rt.left - 200) / 2, 0, SRCCOPY); // Rotate that memory HDC RotateMemoryDC(hBmp, hdcNew, 200, 200, g_angle, hdcMem, dstX, dstY); DeleteObject(hBmp); DeleteDC(hdcNew); // Create the output HDC hdcNew = CreateCompatibleDC(hdc); hBmp = CreateCompatibleBitmap(hdc, 400,400); SelectObject(hdcNew, hBmp); rtmp.left = rtmp.top = 0; rtmp.right = rtmp.bottom = 400; // Fill the output HDC with the window background color and BitBlt the rotated bitmap into it FillRect(hdcNew, &rtmp, GetSysColorBrush(COLOR_WINDOW)); BitBlt(hdcNew, (400 - dstX) / 2, (400-dstY) / 2, dstX, dstY, hdcMem, 0, 0, SRCCOPY); DeleteDC(hdcMem); BitBlt(hdc, (rt.left + rt.right - 400) / 2, rt.bottom - 400, 400, 400, hdcNew, 0, 0, SRCCOPY); DeleteObject(hBmp); DeleteDC(hdcNew); EndPaint(hWnd, &ps);}//// FUNCTION: WndProc(HWND, unsigned, WORD, LONG)//// PURPOSE: Processes messages for the main window.//// WM_COMMAND - process the application menu// WM_PAINT - Paint the main window// WM_DESTROY - post a quit message and return////LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){ int wmId, wmEvent; switch (message) { case WM_TIMER: // Handle the redraw with the timer g_angle = g_angle + .05f; RedrawWindow(hWnd, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW); break; case WM_COMMAND: wmId = LOWORD(wParam); wmEvent = HIWORD(wParam); // Parse the menu selections: switch (wmId) { case IDM_ABOUT: DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About); break; case IDM_EXIT: DestroyWindow(hWnd); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } break; case WM_PAINT: OnDraw(hWnd); break; case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0;}
[解决办法]
我也不清楚了，执行之后pImage没有值，其他都有值，就是函数执行后，结果写不进pImage