社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 7471阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: td(li.,  
  \T4v|Pw\  
  一、实现方法 \o z#l'z  
\ ZgE  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 8H%;WU9-  
a!zz6/q[  
#pragma data_seg("shareddata") Tr_w]'  
HHOOK hHook =NULL; //钩子句柄 -WY<zJ  
UINT nHookCount =0; //挂接的程序数目 :vmH]{R  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 !S$:*5=&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 GA$V0YQX  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey =ElO?9&  
static int KeyCount =0; Ansk,$  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1vS#K=sb  
#pragma data_seg() (of#(I[m7  
6|gCuT4  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 /MIe(,>Uh  
T`9lV2x*P  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: bHY=x}Hv  
MU($|hwiL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR tP:lP#9  
cKey,UCHAR cMask) OC_+("N  
{ ncZ+gzK|"  
 BOOL bAdded=FALSE; r)Ma3FL0;  
 for(int index=0;index<MAX_KEY;index++){ @D]5civm_  
  if(hCallWnd[index]==0){ C/q'=:H;  
   hCallWnd[index]=hWnd; wy<\Tg^J  
   HotKey[index]=cKey; S.mG?zbw  
   HotKeyMask[index]=cMask; 4R#chQ  
   bAdded=TRUE; DEBB()6,  
   KeyCount++; RF`.xQ26=  
   break; 6O7'!@@  
  } WltQ63u  
 } 4svBzZdr  
 return bAdded; >f|||H}Snw  
} "0V.V>-p  
//删除热键 kI,yU}<Fq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) '3R`lv   
{ ;nI] !g:  
 BOOL bRemoved=FALSE; M-$%Rzl_  
 for(int index=0;index<MAX_KEY;index++){ OyU5DoDz1  
  if(hCallWnd[index]==hWnd){ e|g5=2(Pr&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ s%vis{2  
    hCallWnd[index]=NULL; vt/x ,Y  
    HotKey[index]=0; )1Y{Q Y}l  
    HotKeyMask[index]=0; j:Xq1f6a  
    bRemoved=TRUE; V)3KS-  
    KeyCount--; Rm2yPuOU}A  
    break; DRSr%d  
   } ;d@#XIS&-(  
  } N,<uf@LQ  
 } DMAIM|h  
 return bRemoved; FDv<\2+ c  
} O n8v//=&  
+Te\H  
Vouvr<43o  
  DLL中的钩子函数如下: ud63f` W]4  
$CRm3#+ ~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) aacpM[{f  
{ {IjF+@I  
 BOOL bProcessed=FALSE; %{7|1>8  
 if(HC_ACTION==nCode) Z@yW bjE7Z  
 { zZ:>do\2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 L s G\OG  
   switch(wParam) %7QV&[4!  
   {  #?RU;1)Cw  
    case VK_MENU: "0$a)4]  
     MaskBits&=~ALTBIT; ru'F6?d  
     break; FW;m\vu  
    case VK_CONTROL: )n1_(;  
     MaskBits&=~CTRLBIT; _Mi5g_  
     break; +*\u :n  
    case VK_SHIFT: >|J`s~?  
     MaskBits&=~SHIFTBIT; j SHk{T!J  
     break; E}%B;"b/Tj  
    default: //judge the key and send message c|f<u{'  
     break; W=ig.-  
   } C2.HMgL  
   for(int index=0;index<MAX_KEY;index++){ M+-*QyCFK  
    if(hCallWnd[index]==NULL) 36.Z0Z1'F>  
     continue; Dxtp2wu%t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oph}5Krd)  
    { &`h{i K7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Jf@H/luW  
     bProcessed=TRUE; 1&\0:vA^Y  
    } %Wg'i!?cB  
   } sm9k/(-  
  } ] ;KJ6  
  else if((lParam&0xc000ffff)==1){ //有键按下 SP@ >vl+;  
   switch(wParam) .28<tEf  
   { 5b5x!do  
    case VK_MENU: f0!))/rSD  
     MaskBits|=ALTBIT; {GvJZ!,RCg  
     break; 6 o^,@~:R  
    case VK_CONTROL: 65L6:}#  
     MaskBits|=CTRLBIT; eFipIn)b  
     break; MlcR"gl*  
    case VK_SHIFT: Nv$ R\'3  
     MaskBits|=SHIFTBIT; FW.7'7G@n  
     break; GXcJ< v  
    default: //judge the key and send message \1d (9jR  
     break; ~Cbc<[}  
   } Y21g{$~Q{  
   for(int index=0;index<MAX_KEY;index++){ Qd)q([  
    if(hCallWnd[index]==NULL) Y2|#V#  
     continue; j 7fL7:,T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C,wL0Yj[  
    { #:jHp44J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7Sf bx~48  
     bProcessed=TRUE; ,Z aRy$?  
    } j~"Q3P;V  
   } R$v[!A+:'  
  } 2iHUZzz\  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 LU \i0|i|  
   for(int index=0;index<MAX_KEY;index++){ ~Io7]  
    if(hCallWnd[index]==NULL) *lYVY) L  
     continue; 4hO!\5-w:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) tI]Q%S,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); u6?Q3 bvI  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 yZ @"\Z!  
   } :uP,f<=)K  
  } 8G9s<N}5&u  
 } .I$qCb|FP  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \?w2a$?6w  
} %]F d[pzF  
NYt&@Z}]  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ?TM ,Q  
 R(!s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LVX[uWEM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j-0z5|*KE  
"76 ]u)  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: T m,b,hi$  
<S\jpB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g~Z vA(`  
{ G(Lzf(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) |"?M1*g  
 { 9l|@v=gw.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 lun#^J  
  SaveBmp(); ydFD!mO  
  return FALSE; 0+iu(VbF  
 } uya.sF0]9B  
 …… //其它处理及默认处理  0bz'&  
} XO`0>^g  
2n3W=dF  
@"hb) 8ng  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ]"J~:{, d  
O#b6mKPt;t  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 rEv@Y D  
*Y,x|F  
  二、编程步骤 8hXl%{6d3  
4F)-"ck  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; `lQ3C{}  
%Da8{%{`Pc  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; i;]"n;>+/  
J3,fk)  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; K:!"+q  
W6f/T3  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; !5.8]v  
L\Aq6q@c  
  5、 添加代码,编译运行程序。 {K <iih  
w0ht  
三、程序代码 RzBF~2 >i  
{F3xJ[  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL LwrUQ)  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !LggIk1  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ lU @]@_<  
#if _MSC_VER > 1000 pczug-nB  
#pragma once >CrA;\l  
#endif // _MSC_VER > 1000 K17j$o^6KK  
#ifndef __AFXWIN_H__ M%Ji0v38  
#error include 'stdafx.h' before including this file for PCH Y -pzy']4  
#endif \!>3SKs(e  
#include "resource.h" // main symbols ^X0P'l &D2  
class CHookApp : public CWinApp  a(F%M  
{ Nb-;D)W;B  
 public: d&F8nBIM5  
  CHookApp(); |[8&5[);  
  // Overrides 4\>Cnc{  
  // ClassWizard generated virtual function overrides ]"^U  
  //{{AFX_VIRTUAL(CHookApp) b3W@{je  
 public: YeT[KjX  
  virtual BOOL InitInstance(); woQYP,  
  virtual int ExitInstance(); sT|8a  
  //}}AFX_VIRTUAL H{yeN 5   
  //{{AFX_MSG(CHookApp) !M6*A1g5  
  // NOTE - the ClassWizard will add and remove member functions here. L'.7V ~b{  
  // DO NOT EDIT what you see in these blocks of generated code ! Fc{hzqaP8  
  //}}AFX_MSG K%O%#Kk  
  DECLARE_MESSAGE_MAP() USv: + .  
}; \IIR2Xf,K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); W-2,QVp%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $)mK]57  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "1t%J7c_  
BOOL InitHotkey(); V0XQG}  
BOOL UnInit(); m\RU |Z  
#endif b 'jZ4{+W  
*MglX<  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. g?qm >X  
#include "stdafx.h" ^fa+3`>  
#include "hook.h" wknX\,`Q  
#include <windowsx.h> L TzD\C'  
#ifdef _DEBUG nDhr;/"i  
#define new DEBUG_NEW r>+\9q1  
#undef THIS_FILE 1:(qoA:  
static char THIS_FILE[] = __FILE__; yHsmX2s  
#endif A!\ g!*  
#define MAX_KEY 100 &Ba` 3V\M  
#define CTRLBIT 0x04 jhl9  
#define ALTBIT 0x02 p3`ND;KQ  
#define SHIFTBIT 0x01 @m[q0G}  
#pragma data_seg("shareddata") Js.2R$o =*  
HHOOK hHook =NULL; tNj-~r  
UINT nHookCount =0; @i U@JE`C  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey cks53/Z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -PPH]?],  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ssj(-\5  
static int KeyCount =0; 0]p! Bscaf  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift [uqe|< :  
#pragma data_seg() {}RE;5n\['  
HINSTANCE hins; O eLM*Zi  
void VerifyWindow(); <pyLWmO  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [$:M/5y9  
//{{AFX_MSG_MAP(CHookApp) ]zK'aod  
// NOTE - the ClassWizard will add and remove mapping macros here.  3 c #oK  
// DO NOT EDIT what you see in these blocks of generated code! Q$u&/g3NvL  
//}}AFX_MSG_MAP 1$mxMXNsJ  
END_MESSAGE_MAP() S{wR Z|8U  
5G  @  
CHookApp::CHookApp() 4IfOvAN%  
{ Av6=q=D  
 // TODO: add construction code here, DO6Tz -%o  
 // Place all significant initialization in InitInstance x \0( l5>  
} 742 sqHx  
"pUqYMB2i  
CHookApp theApp; ML eo3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  KT'Ebb]  
{ G4O $gg  
 BOOL bProcessed=FALSE; ]$Ud`<Xnx  
 if(HC_ACTION==nCode) vfBIQfH  
 { Q5Yy \M  
  if((lParam&0xc0000000)==0xc0000000){// Key up &ed&2t`Y  
   switch(wParam) 4PdJ  
   { $FR1^|P/G  
    case VK_MENU: 5@c/,6l  
     MaskBits&=~ALTBIT; }MU}-6  
     break; Z!#n55 |  
    case VK_CONTROL: 3QM;K^$  
     MaskBits&=~CTRLBIT; tFj[>_d7  
     break; }enS'Fpf`  
    case VK_SHIFT: MC\rx=cR\  
     MaskBits&=~SHIFTBIT; @9$u!ny0  
     break; Ei$?]~ &  
    default: //judge the key and send message R k'5L  
     break; TTGk"2 Q'  
   } v$n J$M&k  
   for(int index=0;index<MAX_KEY;index++){ Gz09#nFZk  
    if(hCallWnd[index]==NULL) MawWgd*  
     continue; SK][UxoHm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J)kH$!csi  
    { ,?k0~fuG6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6 (M^`&fl  
     bProcessed=TRUE; :6h$1 +6  
    } gC/~@Z8W]  
   } N"',  
  } fS@V`"O6  
  else if((lParam&0xc000ffff)==1){ //Key down fC4#b?Q  
   switch(wParam) KCDbE6  
   { 8?yRa{'"  
    case VK_MENU: dx.,  
     MaskBits|=ALTBIT; sLHUQ(S!  
     break; mK Ta.  
    case VK_CONTROL: DA9-F  
     MaskBits|=CTRLBIT; [<0\v<{`L  
     break; r}>q*yx:  
    case VK_SHIFT: dGc<{sQzB  
     MaskBits|=SHIFTBIT; n "J+? ~9  
     break; B)L=)N  
    default: //judge the key and send message ^i;y2c  
     break; #&$a7L}  
   } dRhsnT+KX  
   for(int index=0;index<MAX_KEY;index++) tJ qd  
   { _x'?igy  
    if(hCallWnd[index]==NULL) BH;7CK=7R  
     continue; f+c<|"we  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Bu{1^g:  
    { n1E^8[~'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G+k~k/D6  
     bProcessed=TRUE; g!![%*' b  
    } ;$FpxurX  
   } Zqp<8M2  
  } .[Hv/?L  
  if(!bProcessed){ Fcp8RBq  
   for(int index=0;index<MAX_KEY;index++){ 3;E,B7,mQ  
    if(hCallWnd[index]==NULL) _=g;K+%fb  
     continue; Nn:>c<[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  "d3qUk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )a;ou>u  
   } WGC'k s ^  
  } C)H1<Br7  
 } "TQ3{=j{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); WU:r:m+ >  
} cs\/6gSCo  
p$+.]  
BOOL InitHotkey() n7$2 1*,  
{ } N$soaUs  
 if(hHook!=NULL){ $Y3mO ~  
  nHookCount++; m1\+~*i  
  return TRUE; jWE?$r"  
 } O\z]1`i*o  
 else +`p@md2L1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ^DaP^<V  
  if(hHook!=NULL) EWZ?q$  
   nHookCount++; M~SbIk<#a<  
  return (hHook!=NULL); 4r+s" |  
} v "Yo  
BOOL UnInit() 0D Q\akh  
{ w1q`  
 if(nHookCount>1){ 84|oqwZO  
  nHookCount--; m,1Hlp  
  return TRUE; g=q1@)  
 } ->q^$#e  
 BOOL unhooked = UnhookWindowsHookEx(hHook); mAZfo53  
 if(unhooked==TRUE){ _ !r]**  
  nHookCount=0; ji] H|  
  hHook=NULL; K4`)srd  
 } -&UP[Mq  
 return unhooked; Oh]RIWL  
} KN\*|)  
fvH4<c5x  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %+F%C=GqI  
{ *l9Wj$vja  
 BOOL bAdded=FALSE; fZ7Ap3dmP  
 for(int index=0;index<MAX_KEY;index++){ R/BW$4/E  
  if(hCallWnd[index]==0){ $sa5aUg }  
   hCallWnd[index]=hWnd; k  __MYb  
   HotKey[index]=cKey; %k8 H'w\  
   HotKeyMask[index]=cMask; xoQ;fVNp  
   bAdded=TRUE; ]A%S&q  
   KeyCount++; ab/^z0GT  
   break; SAUfA5|e  
  } )h>H}wDs  
 } <GRplkf`  
 return bAdded; *ke9/hO1i  
} 1v2pPUH\  
X) O9PQ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3~5 %6`  
{ q8-*3K  
 BOOL bRemoved=FALSE; NBaXfWh  
 for(int index=0;index<MAX_KEY;index++){ x } X1 O)  
  if(hCallWnd[index]==hWnd){ C(jUM!m  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ DM[gjfMXu  
    hCallWnd[index]=NULL; "'zVwU  
    HotKey[index]=0; fHc/5uYW  
    HotKeyMask[index]=0; +ia N[F$  
    bRemoved=TRUE; Aav|N3  
    KeyCount--; hxX-iQya  
    break; 23_\UTM}1  
   } [/'=M h  
  } WJJwhr  
 } )Co&(;zf  
 return bRemoved; ~P@6f K/M  
} c!20(( 2|I  
UL<*z!y  
void VerifyWindow() z($h7TZ$  
{ PEIf)**0N  
 for(int i=0;i<MAX_KEY;i++){ _a[)hu8q.  
  if(hCallWnd!=NULL){ azT@S=,  
   if(!IsWindow(hCallWnd)){ Q/u1$&1  
    hCallWnd=NULL; -ZKo/ N>6}  
    HotKey=0; =, WW#tD  
    HotKeyMask=0; 8*[Q{:'.  
    KeyCount--; `^#V1kRmH  
   } }_GI%+t  
  } tJgo% P1  
 } 4qe!+!#$  
} 9X%H$>s  
|WMP_sGn  
BOOL CHookApp::InitInstance() Y-vLEIX=  
{ KB6'sj  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?Gr2@,jlD  
 hins=AfxGetInstanceHandle(); G zw $M  
 InitHotkey(); ~4{|  
 return CWinApp::InitInstance(); .e|VW)  
} N sNk  
gxf{/EjH  
int CHookApp::ExitInstance() ,MRAEa2  
{ ImZ!8#  
 VerifyWindow(); *~H\#N|x  
 UnInit(); `:&jbd4H  
 return CWinApp::ExitInstance(); QO|roE  
} fRT4,;  
:i8B'|DN5  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $Lx2!Zy  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) B!X;T9^d  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ "T+oXK\B  
#if _MSC_VER > 1000 ?r"QJa>  
#pragma once {=)g?!zC  
#endif // _MSC_VER > 1000 f:_mrzz  
K[/sVaPZ  
class CCaptureDlg : public CDialog q o^PS  
{ <{xU.zp'  
 // Construction i=mk#.j~  
 public: "z/)> ?Wn  
  BOOL bTray; $-Wn|w+h<a  
  BOOL bRegistered; {@tqeu%IM  
  BOOL RegisterHotkey(); dd&n>A3O=  
  UCHAR cKey; 'Bc{N^  
  UCHAR cMask; gZ b +m  
  void DeleteIcon(); n +R3  
  void AddIcon(); vC1D}=Fp  
  UINT nCount; FWu[{X;  
  void SaveBmp(); aUVJ\ ;V  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor [>^xMF]$2  
  // Dialog Data 0[SJ7k19  
  //{{AFX_DATA(CCaptureDlg) (^)" qs B  
  enum { IDD = IDD_CAPTURE_DIALOG }; dd{pF\a  
  CComboBox m_Key; \ f6@B:?y  
  BOOL m_bControl; gp`H>Sn.|  
  BOOL m_bAlt; #x^dR-@   
  BOOL m_bShift; w4UaWT1J  
  CString m_Path; /j|Rz5@ =  
  CString m_Number; hynX5,p;.  
  //}}AFX_DATA (}jYi*B  
  // ClassWizard generated virtual function overrides k_$9cVA  
  //{{AFX_VIRTUAL(CCaptureDlg) JxlU=7cF  
 public: xP+HdA2X  
  virtual BOOL PreTranslateMessage(MSG* pMsg); [->uDbtzL  
 protected: p(J,fus  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ud}B#{6  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); a9<&|L <  
  //}}AFX_VIRTUAL ImnN&[Cu  
  // Implementation E?@batIrf  
 protected: Kq. MmR!gl  
  HICON m_hIcon; _Vj uQ  
  // Generated message map functions (ZI11[e{  
  //{{AFX_MSG(CCaptureDlg) .&R j2d  
  virtual BOOL OnInitDialog(); E,fG<X{  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (w+dB8 )X  
  afx_msg void OnPaint(); K@DK4{  
  afx_msg HCURSOR OnQueryDragIcon(); vI)-Zz[3  
  virtual void OnCancel(); O F|3y~z  
  afx_msg void OnAbout(); CG -^}xE:  
  afx_msg void OnBrowse(); &-s/F`  
  afx_msg void OnChange(); icnc5G  
 //}}AFX_MSG _#2AdhCu  
 DECLARE_MESSAGE_MAP() l[)ZEEP  
}; P{{pp<tX*&  
#endif x9&{@ ?o  
liuF;*  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file e?"XMY  
#include "stdafx.h" 7j <:hF~  
#include "Capture.h" >#j f Z5t  
#include "CaptureDlg.h" v o9Fj  
#include <windowsx.h> l-GQ AI8  
#pragma comment(lib,"hook.lib") JkiMrpkuk  
#ifdef _DEBUG pP`KI'aUN  
#define new DEBUG_NEW n%"0%A  
#undef THIS_FILE @\_l%/z{  
static char THIS_FILE[] = __FILE__; [`u3SN/P  
#endif /M.@dW7 w  
#define IDM_SHELL WM_USER+1 tCw.wDq3=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;is*[r\|1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %^r}$mfy:0  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; q')MKR*  
class CAboutDlg : public CDialog 9w%|Nk>=>  
{ ~gjREl,+D#  
 public: e=]>TeqG0  
  CAboutDlg(); ~|7jz;$V  
  // Dialog Data [^U#ic>cT  
  //{{AFX_DATA(CAboutDlg) 3*DwXH+  
  enum { IDD = IDD_ABOUTBOX }; n<. T6  
  //}}AFX_DATA %S2^i3  
  // ClassWizard generated virtual function overrides DKcg  
  //{{AFX_VIRTUAL(CAboutDlg) wGXnS"L!  
 protected: AxXFzMW  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -}h+hS50F  
  //}}AFX_VIRTUAL RnA>oKc  
  // Implementation  3e<FlH{  
 protected: 6"d^4L?  
  //{{AFX_MSG(CAboutDlg) 2rr}5i)r|  
  //}}AFX_MSG YRkp(}*!\  
  DECLARE_MESSAGE_MAP() QzzV+YG$(4  
}; j70]2NgX  
`3v! i   
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) yWs_Z6b  
{ :OF:(,J  
 //{{AFX_DATA_INIT(CAboutDlg) | Q Y_ci  
 //}}AFX_DATA_INIT 0NN{2"M$p  
} 2hjR'6h"Y  
>UP{= `  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) *mc]Oa  
{ 31w9$H N  
 CDialog::DoDataExchange(pDX); Qo4+=^(  
 //{{AFX_DATA_MAP(CAboutDlg) :?Xd&u0){  
 //}}AFX_DATA_MAP Pgy&/-u  
} N@M(Iw  
/ry# q% ?  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) MNE{mV(  
 //{{AFX_MSG_MAP(CAboutDlg) lF:gQ]oc  
 // No message handlers blwdcdh  
 //}}AFX_MSG_MAP k~(j   
END_MESSAGE_MAP() FBjIft5e  
#xqeCX 4p  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?G5JAG`  
: CDialog(CCaptureDlg::IDD, pParent) }`oe<|  
{ z2m%L0  
 //{{AFX_DATA_INIT(CCaptureDlg) t|gEMDGa3  
  m_bControl = FALSE; +F &,,s"&  
  m_bAlt = FALSE; q;T3bxp+  
  m_bShift = FALSE; $B6"fYiDk  
  m_Path = _T("c:\\"); 00') Ol&  
  m_Number = _T("0 picture captured."); \dyJ=tg  
  nCount=0; 8{5Y%InL  
  bRegistered=FALSE; ` Nn^   
  bTray=FALSE; ;79X# hI  
 //}}AFX_DATA_INIT zMfr`&%e  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 YfC1.8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Ni5~Buf  
} W;]*&P[[   
ckqU2ETpD}  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `;7^@k  
{ G<kslTPyq  
 CDialog::DoDataExchange(pDX); SRl:+!@.  
 //{{AFX_DATA_MAP(CCaptureDlg) r\y~ :  
  DDX_Control(pDX, IDC_KEY, m_Key); XEF|B--,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); m*L*# ZBS  
  DDX_Check(pDX, IDC_ALT, m_bAlt); fF208A7U I  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); aOq>Ra{T  
  DDX_Text(pDX, IDC_PATH, m_Path); x+zz:^yHYf  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ^CUeq"GYoZ  
 //}}AFX_DATA_MAP FbB> Md;  
} m~%\f8w-x  
}2Y:#{m  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) y]5O45E0  
//{{AFX_MSG_MAP(CCaptureDlg) \ajy%$;$}  
 ON_WM_SYSCOMMAND() w/r wE  
 ON_WM_PAINT() \|Pp%U [  
 ON_WM_QUERYDRAGICON() #C1u~db  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) /dpEL9K  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  k%V#{t.  
 ON_BN_CLICKED(ID_CHANGE, OnChange) -W(O~AK  
//}}AFX_MSG_MAP D 8^wR{-;J  
END_MESSAGE_MAP() `;-K/)/x  
SwV{t}I  
BOOL CCaptureDlg::OnInitDialog() j  )6A  
{ &MnS( 82L  
 CDialog::OnInitDialog(); K &m`1f  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); K!6k<  
 ASSERT(IDM_ABOUTBOX < 0xF000); <Q'J=;vV  
 CMenu* pSysMenu = GetSystemMenu(FALSE); K_ P08  
 if (pSysMenu != NULL) 6q ._8%  
 { bCY8CIF  
  CString strAboutMenu; :T(3!}4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); z{U2K '  
  if (!strAboutMenu.IsEmpty()) E(Tvj\9  
  { oJJ2y  
   pSysMenu->AppendMenu(MF_SEPARATOR); |Id0+-V ?  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); X>^St&B}fC  
  } ( /{Wu:e  
 } E7-il;`cKn  
 SetIcon(m_hIcon, TRUE); // Set big icon W'w;cy:H  
 SetIcon(m_hIcon, FALSE); // Set small icon uh'{+E;=  
 m_Key.SetCurSel(0); a#t:+iw  
 RegisterHotkey(); s(W]>Ib  
 CMenu* pMenu=GetSystemMenu(FALSE); @l:\0cO  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8SII>iL{  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); r9<OB`)3+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m,KG}KX  
 return TRUE; // return TRUE unless you set the focus to a control m[6?v;w  
} {fe[$KQ  
b6sj/V8  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5hwe ul>S  
{ hw/ :  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) c3,YA,skb!  
 { wlk{V  
  CAboutDlg dlgAbout; >5Y%4++(  
  dlgAbout.DoModal(); Os--@5e  
 } +~b@W{  
 else ` 6a  
 { g,Z8I;A^  
  CDialog::OnSysCommand(nID, lParam); ;oW#>!HrY  
 } z\wY3pIr2  
} #!="b8F  
yClX!OL  
void CCaptureDlg::OnPaint() SPfz/ q{  
{ ,@1rP55  
 if (IsIconic()) J?VMQTa/+  
 { r'!L}^n  
  CPaintDC dc(this); // device context for painting IiW*'0H:/  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Gf``0F)  
  // Center icon in client rectangle C s XV0  
  int cxIcon = GetSystemMetrics(SM_CXICON); V0 70oZ  
  int cyIcon = GetSystemMetrics(SM_CYICON); LsB|}_j7  
  CRect rect; aX CVC<l  
  GetClientRect(&rect); >@?!-Fy5  
  int x = (rect.Width() - cxIcon + 1) / 2; +/+:D9j ,  
  int y = (rect.Height() - cyIcon + 1) / 2; G)~/$EF,_  
  // Draw the icon &c[.&L,w4  
  dc.DrawIcon(x, y, m_hIcon); klpYtQ  
 } +d/V^ <#  
 else 5dwC~vn}c  
 { ux>wa+XFa  
  CDialog::OnPaint(); W}^X;f  
 } )wT @`p"4  
} G,o5JL"t  
a6Zg~>vX  
HCURSOR CCaptureDlg::OnQueryDragIcon() P _e9>t@  
{ E~]37!,\\9  
 return (HCURSOR) m_hIcon; oUSv)G.zb  
} 'P'f`;'_DC  
4v[Zhf4JM  
void CCaptureDlg::OnCancel() Bh<DqN  
{ o/dj1a~U  
 if(bTray) a ][t#`  
  DeleteIcon(); OoIs'S-Z#  
  CDialog::OnCancel(); Mg pjC`  
} * I)F5M  
 (zIWJJw  
void CCaptureDlg::OnAbout() /7[U J'  
{ I= '6>+P  
 CAboutDlg dlg; NC @L,)F  
 dlg.DoModal(); *'l|ws  
} "A9qC*6[  
0(o{V:l%Z|  
void CCaptureDlg::OnBrowse() QZZt9rA;  
{ eVRPjVzQ'Q  
 CString str; Y'&rSHI"  
 BROWSEINFO bi; #ULjK*)R  
 char name[MAX_PATH]; j 3t,Cx  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); U*Sjb% Qb  
 bi.hwndOwner=GetSafeHwnd(); *!5X!\e_  
 bi.pszDisplayName=name; $:}sm0;  
 bi.lpszTitle="Select folder"; tX.fbL@ T  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; }r}$8M+1  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); )jM' x&Vg  
 if(idl==NULL) }9&Z#1/  
  return; He#5d!cf:M  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); q~[@(+zP5  
 str.ReleaseBuffer(); 5B&#Sh`r  
 m_Path=str; "f/Su(6{0  
 if(str.GetAt(str.GetLength()-1)!='\\') Hm>M}MF3  
  m_Path+="\\"; Y#>'.$ (Az  
 UpdateData(FALSE); f^P:eBgpx  
} C #A sA  
O F$0]V  
void CCaptureDlg::SaveBmp() y4%u< /  
{ =J2\"6BnzA  
 CDC dc; Q\pTyNAYn  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); i+x$Y)=  
 CBitmap bm; %?GLMf7)  
 int Width=GetSystemMetrics(SM_CXSCREEN); ]bjXbbHd  
 int Height=GetSystemMetrics(SM_CYSCREEN); MIblx  
 bm.CreateCompatibleBitmap(&dc,Width,Height); -8j<`(M' 5  
 CDC tdc; "pP5;*^f  
 tdc.CreateCompatibleDC(&dc); [(Z sQK  
 CBitmap*pOld=tdc.SelectObject(&bm); 5_bIc=L1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); C$9+p@G6  
 tdc.SelectObject(pOld); 2~:jg1  
 BITMAP btm; +(v<_#wR-  
 bm.GetBitmap(&btm); Y<~N x~w{  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; K+9oV[DMs  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); r:[N#*kK  
 BITMAPINFOHEADER bih; +Dg%ec  
 bih.biBitCount=btm.bmBitsPixel; _R&}CP  
 bih.biClrImportant=0; 1ga-8&!  
 bih.biClrUsed=0; >C6wm^bl  
 bih.biCompression=0; %9D$N  
 bih.biHeight=btm.bmHeight; [@SLt$9"  
 bih.biPlanes=1; 4'&j<Ah[#  
 bih.biSize=sizeof(BITMAPINFOHEADER); ?\_N*NEtK  
 bih.biSizeImage=size; Ix+===6  
 bih.biWidth=btm.bmWidth; +-b:XeHSZ  
 bih.biXPelsPerMeter=0; @,Je*5$o"  
 bih.biYPelsPerMeter=0; 2h<{~;  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?{bF3Mz=  
 static int filecount=0; Q o}&2m  
 CString name; bU`Ih# q  
 name.Format("pict%04d.bmp",filecount++); ^P5+ _P  
 name=m_Path+name; )XB31^  
 BITMAPFILEHEADER bfh; JNQiCK,)}M  
 bfh.bfReserved1=bfh.bfReserved2=0; q#fj?`k  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ;B%NFvG  
 bfh.bfSize=54+size; ,vfi]_PK  
 bfh.bfOffBits=54; h @{U>U7  
 CFile bf; aq ~g 54  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %GRD3S  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;]ojfR=?%  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); H*#L~!]  
  bf.WriteHuge(lpData,size); yo)a_rY  
  bf.Close(); oY!nM%z/  
  nCount++; UlBg6   
 } *?/9lAm  
 GlobalFreePtr(lpData); "NUl7ce.R  
 if(nCount==1) vn n4  
  m_Number.Format("%d picture captured.",nCount); `v*UY  
 else +r7uIwi$@  
  m_Number.Format("%d pictures captured.",nCount); 7X3<8:%  
  UpdateData(FALSE); I }AO_rtb  
} ~#X,)L{y7v  
&3x \wH/_  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) = > .EDL.  
{ SHw%u~[hu  
 if(pMsg -> message == WM_KEYDOWN) D-)jmz>R  
 { ;p~&G"-C`  
  if(pMsg -> wParam == VK_ESCAPE) !FhK<#  
   return TRUE; 0qXkWGB  
  if(pMsg -> wParam == VK_RETURN) yZf+*j/a7  
   return TRUE; F...>%N$  
 } DA s&4Y`  
 return CDialog::PreTranslateMessage(pMsg); 2ql7*g?Uq@  
} iz'#K?PF_  
NTRw:'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !!Tk'=t9"3  
{ &5&C   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ^%X,Rml<e  
  SaveBmp(); (k?,+jnR  
  return FALSE; xNG 'UbU  
} ;IhkGPpWP  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ S5eQHef  
 CMenu pop; @kR/=EfS  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); '</  
 CMenu*pMenu=pop.GetSubMenu(0); 9XGzQ45R  
 pMenu->SetDefaultItem(ID_EXITICON); 8fpaY{]  
 CPoint pt; *wW/nr=\;  
 GetCursorPos(&pt); Wc4K?3 ZM  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); VFN\ Ryd  
 if(id==ID_EXITICON) \A`pF'50  
  DeleteIcon(); f o])=KM  
 else if(id==ID_EXIT) A8JEig 3Ix  
  OnCancel(); ;I'pC?!y  
 return FALSE; #pJ^w>YNy  
} XAuB.)|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]Xcqf9k  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) l 6wX18~XJ  
 AddIcon(); CFJ F}aW  
 return res; n50XGv  
} 9NwA5TP9_  
zR)|%[sWwQ  
void CCaptureDlg::AddIcon() Ij>x3L\-  
{ aK'`yuN  
 NOTIFYICONDATA data; L|G!of[8n  
 data.cbSize=sizeof(NOTIFYICONDATA); )L#C1DP#  
 CString tip; /#J)EH4p  
 tip.LoadString(IDS_ICONTIP); ^.Y"<oZSS  
 data.hIcon=GetIcon(0); )f4D2c&VE  
 data.hWnd=GetSafeHwnd(); }'{39vc .  
 strcpy(data.szTip,tip); Sc "J5^  
 data.uCallbackMessage=IDM_SHELL; VHX&#vm*  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~o`I[-g)  
 data.uID=98; Xui${UYN  
 Shell_NotifyIcon(NIM_ADD,&data); v%3mhk#  
 ShowWindow(SW_HIDE); m`UNdFS  
 bTray=TRUE; .)^@[yrkz  
} $NP5Z0v7  
' pOtd7Vr  
void CCaptureDlg::DeleteIcon() E"iH$NN  
{ BDY@&vF  
 NOTIFYICONDATA data; +M%i3A  
 data.cbSize=sizeof(NOTIFYICONDATA); XJnDx 09h  
 data.hWnd=GetSafeHwnd(); T{u!4Yu  
 data.uID=98; -bSe=09;S|  
 Shell_NotifyIcon(NIM_DELETE,&data); =tl[?6  
 ShowWindow(SW_SHOW); We3*WsX\  
 SetForegroundWindow(); QLo^6S5!  
 ShowWindow(SW_SHOWNORMAL); z^9Yoqog  
 bTray=FALSE; W?{:HV  
} Xg.'<.!g0  
pmXx2T#=  
void CCaptureDlg::OnChange() HGmgQ>q@M$  
{ 'X{cDdS^  
 RegisterHotkey(); PPT"?lt*&  
} E!'H,#"P  
$enh>!mU  
BOOL CCaptureDlg::RegisterHotkey() f&t]O$  
{ 48M)A  
 UpdateData(); Ay<'Z6`  
 UCHAR mask=0; Fa^5.p  
 UCHAR key=0; 5gW`;Cdbyc  
 if(m_bControl) 9"2.2li5$  
  mask|=4; 94%gg0azp  
 if(m_bAlt) %JDG aG'  
  mask|=2; "+s#!Fh *  
 if(m_bShift) `(1em%}  
  mask|=1; H V<|eL #  
  key=Key_Table[m_Key.GetCurSel()]; 2}]6~i  
 if(bRegistered){ 4vTO  #F  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); c;e-[F7  
  bRegistered=FALSE; @lAOi1m,,  
 } @~fg[)7M  
 cMask=mask; hN c;, 13  
 cKey=key; Ken|!rL  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }GsZ)\!$4  
 return bRegistered; 8rXq-V_u  
} 0.O pgv2K  
}uWJ  
  四、小结 />q=qkdq0  
aGNVqS%y  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
10+5=?,请输入中文答案:十五