Question

编写win32程序怎么加载图片

Answer 1

//.rc
pic BITMAP "pic.bmp"

//.cpp
#include<windows.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

HBITMAP hBm;
BITMAP bm;
int iWindowWidth;
int iWindowHeight;
HDC hDC;
HDC hdcmem;
PAINTSTRUCT ps;

int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInst,
LPSTR lpszCmdLine,
int nCmdShow)
{
HWND hwnd;
MSG Msg;

//用HBITMAP指向资源内的图片
hBm = LoadBitmap(hInstance,"pic");
//读取该图片到BITMAP结构体中
GetObject(hBm,sizeof(BITMAP),&bm);
//根据图片大小获取窗口大小
iWindowWidth = bm.bmWidth;
iWindowHeight = bm.bmHeight;

WNDCLASS wndclass;
char lpszClassName[]="窗口";
char lpszTitle[]="窗口示例程序";
wndclass.style=0;
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=lpszClassName;
if(! RegisterClass(&wndclass))
{
MessageBeep(0);
return FALSE;
}
hwnd=CreateWindow(lpszClassName,
lpszTitle,
WS_CAPTION |WS_SYSMENU ,
CW_USEDEFAULT,CW_USEDEFAULT,
iWindowWidth,iWindowHeight,
NULL,
NULL,
hInstance,
NULL);
ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&Msg,NULL,0,0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return (int)Msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM
IParam)
{
switch(message)
{
case WM_CREATE:
//获取设备描述表
hDC = GetDC(hwnd);
//在内存中创建与hDC相同的设备描述表
hdcmem = CreateCompatibleDC(hDC);
//释放设备描述表
ReleaseDC(hwnd,hDC);
break;
case WM_PAINT:
hDC = BeginPaint(hwnd,&ps);
//选择用图片进行绘制
SelectObject(hdcmem,hBm);
//显示图片从hdcmem到hDC
BitBlt(hDC,0,0,bm.bmWidth,bm.bmHeight,hdcmem,0,0,SRCCOPY);
EndPaint(hwnd,&ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
default:
return DefWindowProc(hwnd,message,wParam,IParam);
}
return(0);
}