窗体信息监视

#include<time.h>#include<stdio.h>#include<stdlib.h>#include<string.h>int my_print(FILE *,const char*);

#include"my_print.h"int my_print(FILE *fp,const char* pstr){ struct tm *ptm; time_t lt; char pti[100]; if(fp==NULL) { return 1; } lt=time(NULL); ptm=localtime(<); sprintf(pti,"%d:%d:%d %s/n",ptm->tm_hour,ptm->tm_min,ptm->tm_sec,pstr); fputs(pti,fp); return 0;} #include<windows.h>#include<stdio.h>#include"my_print.h"LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);FILE *fp; int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow){ static TCHAR szAppName[]=TEXT("scrollwindow"); 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.lpszMenuName=NULL; wndclass.lpszClassName=szAppName; if(!RegisterClass(&wndclass)){ MessageBox(NULL,TEXT("This program requires Windows NT!"),szAppName,MB_ICONERROR); return 0; } fp=fopen("log.txt","w"); hwnd=CreateWindow(szAppName,TEXT("scroll window test"), WS_OVERLAPPEDWINDOW|WS_VSCROLL, 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); } fclose(fp); return msg.wParam;}LRESULT CALLBACK WndProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam){ HDC hdc; SCROLLINFO si; PAINTSTRUCT ps; char szBuffer[100]; switch(uMsg) { case WM_CREATE: my_print(fp,"wm_create_run"); si.cbSize=sizeof(si); si.fMask=SIF_ALL; si.nPage=10; si.nPos=0; si.nTrackPos=0; si.nMin=0; si.nMax=50; SetScrollInfo(hwnd,SB_VERT,&si,TRUE); return 0; case WM_VSCROLL: my_print(fp,"wm_vscroll"); si.cbSize=sizeof(si); si.fMask=SIF_ALL; GetScrollInfo(hwnd,SB_VERT,&si); switch(LOWORD(wParam)) { case SB_TOP: si.nPos = si.nMin; break; case SB_BOTTOM: si.nPos = si.nMax; break; case SB_LINEUP: si.nPos -= 1; break; case SB_LINEDOWN: si.nPos += 1; break; case SB_PAGEUP: si.nPos -= si.nPage; break; case SB_PAGEDOWN: si.nPos += si.nPage; break; case SB_THUMBTRACK: si.nPos = si.nTrackPos; break; default: break; } SetScrollInfo (hwnd, SB_VERT, &si, TRUE); InvalidateRect(hwnd,NULL,TRUE); return 0; case WM_PAINT: my_print(fp,"wm_paint"); hdc=BeginPaint(hwnd,&ps); GetScrollInfo(hwnd,SB_VERT,&si); wsprintf(szBuffer,"si.nMin:%d",si.nMin); TextOut(hdc,20,20,szBuffer,strlen(szBuffer)); EndPaint(hwnd,&ps); return 0; case WM_SIZE: my_print(fp,"wm_size"); return 0; case WM_DESTROY: my_print(fp,"wm_destroy"); PostQuitMessage(0); return 0; } return DefWindowProc(hwnd,uMsg,wParam,lParam);}

result：

20:31:25   wm_create_run
20:31:25   wm_size
20:31:25   wm_paint
20:31:27   wm_destroy

 

以上这个程序不能刷新出正确的si.nMin的值，因为窗体每次接受一个消息后，si的值是不被保留的，所以下一个消息过来，读取的si里面的值是随机的，解决的方法是定义一套static的变量来存储si中的值。