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用Visual C++实现屏幕抓图程序

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 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: Iur} ZAz  
  M@86u^80  
  一、实现方法 |,~A9  
0#nXxkw  
  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: n>+W]I&E  
`\uv+^x{  
#pragma data_seg("shareddata") pKlT.<X7  
HHOOK hHook =NULL; //钩子句柄 S|h  m  
UINT nHookCount =0; //挂接的程序数目 z4UQ:z@  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 oRF"[G8BV  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 f6C+2L+Hr  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Re ur#K  
static int KeyCount =0; bL[W.O0  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 W8rn8Rh  
#pragma data_seg() .`=PE&xq  
JEkVj']?  
  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。 9r*T3=u.S  
D[y|y 3F  
  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: j[eEyCW[)  
b,A1(_pzi  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Mo=-P2)>lt  
cKey,UCHAR cMask) srA~gzF  
{ B{KD  ]  
 BOOL bAdded=FALSE; fYPU'"hzG  
 for(int index=0;index<MAX_KEY;index++){ 2|o$eq3t  
  if(hCallWnd[index]==0){ v0J1%{/xs  
   hCallWnd[index]=hWnd; _$lQK{@rY  
   HotKey[index]=cKey; @Ec9Do>  
   HotKeyMask[index]=cMask; R;ug+N  
   bAdded=TRUE; {vlh ,0~  
   KeyCount++; / /rWc,c  
   break; Om~C0  
  } ~PAn _]Z  
 } MUl+Oy>  
 return bAdded; b=l}|)a  
} ]TOY_K8"z#  
//删除热键 Q{-r4n|b  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jX,~iZ_B  
{ g >oLc6T  
 BOOL bRemoved=FALSE; =h!m/f^x  
 for(int index=0;index<MAX_KEY;index++){ S"z4jpqn3  
  if(hCallWnd[index]==hWnd){ DF =. G1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ti% e.p0[  
    hCallWnd[index]=NULL; ylJlICK  
    HotKey[index]=0; L  *@>/N  
    HotKeyMask[index]=0; |7fBiVo  
    bRemoved=TRUE; XITQB|C??$  
    KeyCount--; S>Y?QQ3#wp  
    break; Ymvd= F   
   } 1OL~)X3  
  } VG^-aR_F  
 } S22; g  
 return bRemoved; uIwyan-  
} lEs/_f3;A  
\_'pUp22  
9-SXu lgu  
  DLL中的钩子函数如下: &YMj\KmlSg  
uuB\~ #?T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \I]'6N=  
{ mqw.v$>  
 BOOL bProcessed=FALSE; aQ. \!&U  
 if(HC_ACTION==nCode) ^" -2fJ  
 { ma~`&\xE  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 hT#mM*`  
   switch(wParam) H[Cn@XE  
   {  @gz?T;EC  
    case VK_MENU: 4|thDb)]  
     MaskBits&=~ALTBIT; >MH@FnUL  
     break; "{lnSLk  
    case VK_CONTROL: jL$X3QS:  
     MaskBits&=~CTRLBIT; * PPFk.#x  
     break; 1[ Pbsb  
    case VK_SHIFT: Q1yTDJ(2  
     MaskBits&=~SHIFTBIT; ]CYe=m1<2Q  
     break; Y._AzJ&B[  
    default: //judge the key and send message 70~]J8T+u  
     break; na)_8r~  
   } <^paRKEa+#  
   for(int index=0;index<MAX_KEY;index++){ {HeMdGn9  
    if(hCallWnd[index]==NULL) kOO2 ?L|Z  
     continue; "'L SLp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zx*f*L,6F  
    { ]&>)=b!,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #96a7K  
     bProcessed=TRUE; ;Wdo*ysW  
    } 40XI\yE_?  
   } S;~_9i]upe  
  } F(r &:3!97  
  else if((lParam&0xc000ffff)==1){ //有键按下 C&gJP7UF  
   switch(wParam) XJ+sm^`vOf  
   { P+a&R<Dj4  
    case VK_MENU: RB2u1]l  
     MaskBits|=ALTBIT; e{=$4F  
     break;  o~B=[  
    case VK_CONTROL: dWA7U6c<  
     MaskBits|=CTRLBIT; AXFVsZH"zi  
     break; 0OXd*  
    case VK_SHIFT: wSDDejg  
     MaskBits|=SHIFTBIT; 04:Dbt~=?p  
     break; 4Ki'r&L\  
    default: //judge the key and send message L<n_}ucA  
     break; QB3AL; 7  
   } qI}Zg)q]  
   for(int index=0;index<MAX_KEY;index++){ -_+0[Nb.  
    if(hCallWnd[index]==NULL) 6822xk  
     continue; tp"\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e_SlM=_ u  
    {  Sk-Ti\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); E_P]f%  
     bProcessed=TRUE; BKk*<WMD  
    } tq[C"| dH  
   } Up:#Zs2  
  } = j -  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 "q8wEu,z[  
   for(int index=0;index<MAX_KEY;index++){ cP,jC(<N  
    if(hCallWnd[index]==NULL) W7 $yE},z  
     continue; KH-.Z0 2U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) &IPT$=u  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); hwJ.M4  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 $HRpG  
   } ^*W3{eyi(L  
  } Oqyh{q%]  
 } -kO=pYP*O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ocvBKsfhE`  
} D c^d$gh  
7^1ikmYY  
  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: [0 $Y@ek[  
`?:'_K i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m(Oup=\%b}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #AHIlUH"m  
+_<# 8v  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 4dO>L"  
q:( K^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lWR  
{ v'uQ'CiH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) IKt9=Tx  
 { D~<GVp5T  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 fN9hBC@  
  SaveBmp(); 2-]m#}zbP  
  return FALSE; {)+/w"^.  
 } >z2 {D7  
 …… //其它处理及默认处理 |67UN U  
} *m7e>]-  
ZISR]xay  
;-3M  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 W$y?~2  
aPbHrk*/  
  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。 uo0(W3Q *  
r=vE0;7  
  二、编程步骤 +CACs7tV  
,i}"e(f  
  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"; Y9Pb  
tC;D4i  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; |D\ ukml  
,?}TSJKC  
  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; :c\NBKHv*  
Sdn] f4  
  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; ."2V:;;  
.]" o-(gB  
  5、 添加代码,编译运行程序。 ,{%[/#~6  
`hbM 2cM  
三、程序代码 N7[~Y2i  
QRRZMdEGs[  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL up`6IWlLE  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _*+M'3&=  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ yO !*pC  
#if _MSC_VER > 1000 vO\CPb %/  
#pragma once FIuKX"XR  
#endif // _MSC_VER > 1000 Gce![<|ph  
#ifndef __AFXWIN_H__ =Ij;I~  
#error include 'stdafx.h' before including this file for PCH Uc/%4Gx   
#endif v;OA hFr|  
#include "resource.h" // main symbols I;No++N0  
class CHookApp : public CWinApp %c&h:7);  
{ 3KqylC &.  
 public: zpY8w#b  
  CHookApp(); g3y44G CV  
  // Overrides KMZ% 1=a  
  // ClassWizard generated virtual function overrides S_)va#b#  
  //{{AFX_VIRTUAL(CHookApp) Dx8^V%b  
 public: 6K,AQ.=V2  
  virtual BOOL InitInstance(); )t|M)zJ  
  virtual int ExitInstance(); ].$N@t C  
  //}}AFX_VIRTUAL MQI6e".  
  //{{AFX_MSG(CHookApp) ,Rf<6/A  
  // NOTE - the ClassWizard will add and remove member functions here. 7 `|- K  
  // DO NOT EDIT what you see in these blocks of generated code ! (LnKaf8  
  //}}AFX_MSG \X(.%5xC  
  DECLARE_MESSAGE_MAP() $(GXlhA  
}; <h^vl-L>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 0s(G*D2%6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8garRB{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~;MRQE  
BOOL InitHotkey(); m49)cK?  
BOOL UnInit(); 7{p,<Uz<"U  
#endif ec{pWzAe  
5y.kOe4vH  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. z 6p.{M  
#include "stdafx.h" Eg ;r]?|6  
#include "hook.h" DlaA-i]l  
#include <windowsx.h> lK{h%2A\b  
#ifdef _DEBUG Z/%>/  
#define new DEBUG_NEW Hi )n]OE  
#undef THIS_FILE rK"x92P0  
static char THIS_FILE[] = __FILE__; 1>n@`M8}  
#endif IF<jq\M  
#define MAX_KEY 100 -?j'<g0  
#define CTRLBIT 0x04 tFG&~tNc  
#define ALTBIT 0x02 SlmgFk!r!  
#define SHIFTBIT 0x01 %/4ChKf!VR  
#pragma data_seg("shareddata") UF?qL1w  
HHOOK hHook =NULL; Nl0*"}`I_  
UINT nHookCount =0; DRal{?CH  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey gVb;sk^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT P#iBwmwN+.  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey yAaMYF@  
static int KeyCount =0; U1I2+;"#A  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift mzDbw-#  
#pragma data_seg() @<h@d_8^k  
HINSTANCE hins; 'v?Z~"w=  
void VerifyWindow(); tX)^$3A  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >]FRHJo_  
//{{AFX_MSG_MAP(CHookApp) c!b4Y4eJ  
// NOTE - the ClassWizard will add and remove mapping macros here. .|!Kv+yD  
// DO NOT EDIT what you see in these blocks of generated code! 8^kw  
//}}AFX_MSG_MAP h^cM#L^B  
END_MESSAGE_MAP() m$ "B=b2  
\:8 >@Q  
CHookApp::CHookApp() 0ZTT^2R  
{ y%f'7YZ4  
 // TODO: add construction code here, I t",WFE.  
 // Place all significant initialization in InitInstance af.yC[  
} 67 ^?v)|  
2Lm.;l4YO  
CHookApp theApp; ca5Ir<mL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) L2+~I<|>  
{ }qxw Nmx  
 BOOL bProcessed=FALSE; 6VW&An[6r  
 if(HC_ACTION==nCode) Ub3^Js!b%  
 { I vO#tI  
  if((lParam&0xc0000000)==0xc0000000){// Key up Tw 8$6KUW  
   switch(wParam) M/T ll]\|  
   {  BVU>M*k  
    case VK_MENU: q9|'!m5K  
     MaskBits&=~ALTBIT; ] %pr1Ey  
     break; 8a)lrIg  
    case VK_CONTROL: mSr(PIH{\  
     MaskBits&=~CTRLBIT; s>ilxLSX]  
     break; n2cb,b/7  
    case VK_SHIFT: '_>8_  
     MaskBits&=~SHIFTBIT; ^i:%0"[*^i  
     break; qi!+ Ceo}  
    default: //judge the key and send message 5NH NnDhuL  
     break; G?*)0`~W  
   } lG6P+ Z/nf  
   for(int index=0;index<MAX_KEY;index++){ 'a[|'  
    if(hCallWnd[index]==NULL) t[ cHdI  
     continue; @X5F$=aqZr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d[=~-[  
    { JYc;6p$<i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R `  
     bProcessed=TRUE; vL}e1V:  
    } ^\KZE|^3@  
   } >8PGyc*9  
  } -Q9} gaH_  
  else if((lParam&0xc000ffff)==1){ //Key down d0YDNP%,_  
   switch(wParam) muc6gwBp  
   { 54r/s#|-3  
    case VK_MENU: m7!M stu  
     MaskBits|=ALTBIT; n3 y`='D  
     break; Yv>kToa\^  
    case VK_CONTROL: @Jr:+|v3B  
     MaskBits|=CTRLBIT; MfNsor  
     break; W"$sN8K>)  
    case VK_SHIFT: +VT/ c  
     MaskBits|=SHIFTBIT; C%H{"  
     break; =# 0f4z  
    default: //judge the key and send message F=EG#<@u  
     break; juIi-*R!  
   } OXp(rJ*bK  
   for(int index=0;index<MAX_KEY;index++) hh#p=Y(f  
   { 9X/]O<i,Es  
    if(hCallWnd[index]==NULL) Kjzo>fIC{  
     continue; PUcxlD/a}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UB^OMB-W.m  
    { K,j'!VQA4g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); O3 NI  
     bProcessed=TRUE; y!eT>4Oyg  
    } ;8m)a  
   } "lLwgh;  
  } TMJq-u51  
  if(!bProcessed){ W-D{ cU  
   for(int index=0;index<MAX_KEY;index++){ gv\WI4"n  
    if(hCallWnd[index]==NULL) ur\<NApT;  
     continue; Vq$8!#~w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mSeCXCrZlI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); l]R=I2t  
   } YxowArV}uz  
  } Y<qWG 8X  
 } lWPh2k  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); YpJJ]Rszg  
} y90wL U9f  
=hY9lxW  
BOOL InitHotkey() ,i)wS1@  
{ +cWo^d.  
 if(hHook!=NULL){ g|TWoRx:  
  nHookCount++; 3Zdwt\OQ  
  return TRUE; 717S3knlv  
 } O#Ma Z.=  
 else N1iP!m9Q  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 6U9F vPJ  
  if(hHook!=NULL) 1Be/(pSc  
   nHookCount++; m941 Y  
  return (hHook!=NULL); vB<9M-sa0  
} ghGpi U$  
BOOL UnInit() pF/s5z  
{ q{Ao j  
 if(nHookCount>1){ P"[\p|[U  
  nHookCount--; k@Qd:I;;  
  return TRUE; &ea6YQ  
 } 4ibOVBG:*,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); #?"^:,Y  
 if(unhooked==TRUE){ OMf w#  
  nHookCount=0; []:&WA 9N  
  hHook=NULL; (h"-#q8$  
 } PCx:  
 return unhooked; o3W@)|>  
} \&/V p`  
X6<Ds'I  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l#IN)">1  
{ YJGP8  
 BOOL bAdded=FALSE; otA'+4\  
 for(int index=0;index<MAX_KEY;index++){ G4rd<V0[D  
  if(hCallWnd[index]==0){ ^u(-v/D9  
   hCallWnd[index]=hWnd; "% l``  
   HotKey[index]=cKey; [>D5(O  
   HotKeyMask[index]=cMask; %0Ibi  
   bAdded=TRUE; BEtFFi6ot  
   KeyCount++; @.)WS\Cv#E  
   break; 0oQJ}8t  
  } @d|3c7` A  
 } 2Q%*` vCuV  
 return bAdded;  < v1.+  
} ~jJF&*)  
/ %1-tGh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zJ)`snN|  
{ \NTVg6>qN  
 BOOL bRemoved=FALSE; X2T_}{  
 for(int index=0;index<MAX_KEY;index++){ i&KBMx   
  if(hCallWnd[index]==hWnd){ } `Cc-X7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <!=:{&d%  
    hCallWnd[index]=NULL; %6\L^RP  
    HotKey[index]=0; 4&AGVplgF  
    HotKeyMask[index]=0; > -,$  
    bRemoved=TRUE; {4{X`$  
    KeyCount--; 0YZ66VN!  
    break; :{,k F  
   } cs9"0&JX  
  } l6- n{zG  
 } _MW W  
 return bRemoved; 7jw5'`;)"  
} !i_~<6Wa7  
 {b|V;/  
void VerifyWindow() Q[c:A@oW  
{ B[~Q0lPih  
 for(int i=0;i<MAX_KEY;i++){ D@%!|:  
  if(hCallWnd!=NULL){ 5(t hDZ!  
   if(!IsWindow(hCallWnd)){ QtA@p  
    hCallWnd=NULL; MxOIe|=&  
    HotKey=0; </pt($  
    HotKeyMask=0; @HE<\Z{ KI  
    KeyCount--; .P#t"oW}  
   } + B<7]\\M  
  } ;OC{B}.vH  
 } *B)10R  
} NIAji3  
G\R6=K:f7  
BOOL CHookApp::InitInstance() %Z8wUG  
{ T|p%4hH  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); r6&+pSA>  
 hins=AfxGetInstanceHandle(); @^%YOorr  
 InitHotkey(); _7b4+ L  
 return CWinApp::InitInstance(); h.\p+Qw.  
} a4XK.[O  
MoXai0d%  
int CHookApp::ExitInstance() jX .' G   
{ YZAQt* x  
 VerifyWindow(); ydMhb367|  
 UnInit(); GL _hRu  
 return CWinApp::ExitInstance(); J| 1!4R~  
} `YY07(%  
FE1'MUT_  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Y.q$"lm7k  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) cqaq~  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ OepQ Z|2  
#if _MSC_VER > 1000 Gzp*Vr  
#pragma once v%kl*K`*  
#endif // _MSC_VER > 1000 }zIWagC6  
)Y`ybADd3  
class CCaptureDlg : public CDialog Bjh8uW G  
{ 1)5/a5  
 // Construction ;Fd1:"1pP  
 public: /8 y v8  
  BOOL bTray; *TrpW?]Y&  
  BOOL bRegistered; ~R\ $Z  
  BOOL RegisterHotkey(); MAp#1+k  
  UCHAR cKey; ..x 2  
  UCHAR cMask; P'<j<h6  
  void DeleteIcon(); nt@uVwfQ  
  void AddIcon(); N;DE,[:<  
  UINT nCount; fymmA faR  
  void SaveBmp();  c& $[a%s  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor mKoDy`s  
  // Dialog Data ['Qh#^p  
  //{{AFX_DATA(CCaptureDlg) If8Lt}-  
  enum { IDD = IDD_CAPTURE_DIALOG }; ]z]=?;ty%  
  CComboBox m_Key; \TLfLqA  
  BOOL m_bControl; t>Yl= 79,  
  BOOL m_bAlt; pq%inSY  
  BOOL m_bShift; ol~ tfS  
  CString m_Path; ~i.rk#{?D  
  CString m_Number; EN__C$  
  //}}AFX_DATA G5lBCm   
  // ClassWizard generated virtual function overrides ,."wxP2u  
  //{{AFX_VIRTUAL(CCaptureDlg) RU~Pa+H  
 public: TEbIU8{Y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); i6S["\h>  
 protected: 1d$wP$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W)^%/lAh  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); b~{nS,_Rn  
  //}}AFX_VIRTUAL q,OCA\  
  // Implementation *,)1Dcv(  
 protected: {{)pb>E  
  HICON m_hIcon; M,cz7,  
  // Generated message map functions IR?nH`V  
  //{{AFX_MSG(CCaptureDlg) >QPCYo<E  
  virtual BOOL OnInitDialog(); ]bbP_n8  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3NdO3-~)  
  afx_msg void OnPaint(); $oJjgAxcZ  
  afx_msg HCURSOR OnQueryDragIcon(); #bCUI*N"P  
  virtual void OnCancel(); =@&>r5W1  
  afx_msg void OnAbout(); s@g _F  
  afx_msg void OnBrowse(); p}JGx^X ~  
  afx_msg void OnChange(); o?+?@Xb'  
 //}}AFX_MSG a@AIv"q  
 DECLARE_MESSAGE_MAP() RjR+'<7E^  
}; E>:#{%  
#endif 'e6J&X  
"Bz#5kqnl  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file i~3\dp  
#include "stdafx.h" brK7|&R<  
#include "Capture.h" EztuVe  
#include "CaptureDlg.h" k2.\1}\  
#include <windowsx.h> C>F5=&  
#pragma comment(lib,"hook.lib") 1(Z+n,Hh  
#ifdef _DEBUG F=PBEaX  
#define new DEBUG_NEW W e*uZ?+  
#undef THIS_FILE $@w ,9J\  
static char THIS_FILE[] = __FILE__; ^E)8Sb9t  
#endif Galh _;=  
#define IDM_SHELL WM_USER+1 n]nJ$u1u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )TBm?VMe  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =`2jnvx  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A'"J'q*t  
class CAboutDlg : public CDialog r oBb o  
{ } Fli  
 public: s#aane  
  CAboutDlg(); xgtx5tg  
  // Dialog Data ~S<}q6H.  
  //{{AFX_DATA(CAboutDlg) 9yu#G7  
  enum { IDD = IDD_ABOUTBOX }; 'j?H >'t{  
  //}}AFX_DATA Hn/V*RzQ  
  // ClassWizard generated virtual function overrides uc\G)BN  
  //{{AFX_VIRTUAL(CAboutDlg) N/1xc1$SB  
 protected: rl2(DA{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y1F%-o  
  //}}AFX_VIRTUAL - ^Y\'y2  
  // Implementation :G=ol2Q  
 protected: iG"1~/U  
  //{{AFX_MSG(CAboutDlg) p^Z|$aZZ  
  //}}AFX_MSG [.$/o}  
  DECLARE_MESSAGE_MAP() p9!jM\(  
}; ')iyD5/4  
?;Da%VS3  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @RCZ![XYWg  
{ 1\AcceJ|(w  
 //{{AFX_DATA_INIT(CAboutDlg) _`Y%Y6O1/  
 //}}AFX_DATA_INIT 1c*:" k  
} twt's,dO  
WpMm%G~'4t  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) F3 g$b,RMH  
{ K;`W4:,  
 CDialog::DoDataExchange(pDX); -zZb]8\E  
 //{{AFX_DATA_MAP(CAboutDlg) !Q}Bz*Y  
 //}}AFX_DATA_MAP 3ly ]DTbz  
} >u|4490<0  
%WqUZ+yy  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) vrh2}biCR  
 //{{AFX_MSG_MAP(CAboutDlg) U.=TjCW  
 // No message handlers U} Pr1  
 //}}AFX_MSG_MAP B7S)L#l_\  
END_MESSAGE_MAP() bU}l*"  
Moi>Dp  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ) bd`U  
: CDialog(CCaptureDlg::IDD, pParent) Yf1%7+V35  
{ =tX"aCW~  
 //{{AFX_DATA_INIT(CCaptureDlg) 0Ag2zx  
  m_bControl = FALSE; Cd_H<8__  
  m_bAlt = FALSE; %fXgV\xY  
  m_bShift = FALSE; ,,g: x  
  m_Path = _T("c:\\"); m!(dk]  
  m_Number = _T("0 picture captured."); &#9HV  
  nCount=0; )Ofwfypc  
  bRegistered=FALSE; ]w]:9w  
  bTray=FALSE; YllW2g:  
 //}}AFX_DATA_INIT !G<gp4Js+N  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @lqI,Ce5  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `'9t^ 6mk  
} SP vKq=,  
O7J V{'?  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) a4]=4[(iu>  
{ Y$fF"p G?  
 CDialog::DoDataExchange(pDX);  {+gK\Nz  
 //{{AFX_DATA_MAP(CCaptureDlg) E};1 H  
  DDX_Control(pDX, IDC_KEY, m_Key); 4KW_#d`t  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); >keY x<1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ']H*f2y  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +JB*1dz>8  
  DDX_Text(pDX, IDC_PATH, m_Path); roIc1Ax:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); a,:Nlr3  
 //}}AFX_DATA_MAP  Sg(\+j=  
} _+Uf5,.5yU  
{>Qs+]  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) COxJ,v(  
//{{AFX_MSG_MAP(CCaptureDlg) 6rlM\k@!  
 ON_WM_SYSCOMMAND() b8 6c[2  
 ON_WM_PAINT() Ng*O/g`%L  
 ON_WM_QUERYDRAGICON() }!WuJz"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) (%fSJCBl[P  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) `0=j,54cx  
 ON_BN_CLICKED(ID_CHANGE, OnChange) N*KM6j  
//}}AFX_MSG_MAP " "CNw-^t  
END_MESSAGE_MAP() u~Y+YzCxV  
]XWtw21I1  
BOOL CCaptureDlg::OnInitDialog() D/z*F8'c  
{ &}0#(Fa`  
 CDialog::OnInitDialog(); )>pIAYCVP  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); `R-VJR 2"  
 ASSERT(IDM_ABOUTBOX < 0xF000); c =Zurqj  
 CMenu* pSysMenu = GetSystemMenu(FALSE); m'2EiYX$}\  
 if (pSysMenu != NULL) )-i(%;,*e  
 { FX~pjM  
  CString strAboutMenu; R?:(~ X\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); xoQqku"vn  
  if (!strAboutMenu.IsEmpty()) iH-(_$f;  
  { BbgKaCq  
   pSysMenu->AppendMenu(MF_SEPARATOR); .]; `  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Tq%##  
  } ~-A"M_n ?  
 } =05jjR1  
 SetIcon(m_hIcon, TRUE); // Set big icon Qqp=  
 SetIcon(m_hIcon, FALSE); // Set small icon Nu><r  
 m_Key.SetCurSel(0); iUS?xKN$~-  
 RegisterHotkey(); F[X;A\  
 CMenu* pMenu=GetSystemMenu(FALSE); A*W/Q<~I  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); * [b~2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); v5L#H=P  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); TezwcFqH  
 return TRUE; // return TRUE unless you set the focus to a control Xs)?PE [  
} 9hhYyqGsO  
py\/m]  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) wNl "y  
{ qITd.< k  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) (>-(~7PR  
 { ,(kaC.Em  
  CAboutDlg dlgAbout; J^mm"2  
  dlgAbout.DoModal(); oho~?.F  
 } Rts}y:44  
 else UJ&gm_M+kL  
 { %vU*4mH  
  CDialog::OnSysCommand(nID, lParam); x' 3kHw  
 } %;O# y3,  
} okBaQH2lUl  
XE;aJ'kt  
void CCaptureDlg::OnPaint() rTeADu_vf  
{ 'uLYah  
 if (IsIconic()) px^brzLQo  
 { oN(F$Nvk  
  CPaintDC dc(this); // device context for painting e!4Kl:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 1tH#QZIT  
  // Center icon in client rectangle z| zd=3c  
  int cxIcon = GetSystemMetrics(SM_CXICON); uJJP<mDgA  
  int cyIcon = GetSystemMetrics(SM_CYICON); DjiWg(X  
  CRect rect; =fI0q7]ndz  
  GetClientRect(&rect); !6*4^$i#o  
  int x = (rect.Width() - cxIcon + 1) / 2; 5pq9x4&  
  int y = (rect.Height() - cyIcon + 1) / 2; 7zu3o  
  // Draw the icon O9:J ^g  
  dc.DrawIcon(x, y, m_hIcon); A~'p~ @L  
 } p5bM/{DP;K  
 else z2SR/[I?  
 { ,.,Y{CP  
  CDialog::OnPaint(); V V Aw y6  
 } 9<*<-x{A17  
} 2*0n#" L  
OJ}aN>k  
HCURSOR CCaptureDlg::OnQueryDragIcon() mtNB09E(  
{ 62>/0_m5  
 return (HCURSOR) m_hIcon; L$}'6y/@  
} oRl@AhS  
@Hst-H.l<l  
void CCaptureDlg::OnCancel() &- ZRS/_d>  
{ C] |m|`  
 if(bTray) $)7Af6xD  
  DeleteIcon(); 2spK#0n.HV  
  CDialog::OnCancel(); CfHPJ: Qo[  
} 'h{DjNSM  
[.4D<}e  
void CCaptureDlg::OnAbout() V(n3W=#kky  
{ N{fYO4O  
 CAboutDlg dlg; -257g;  
 dlg.DoModal(); 3$kElq[  
} MZSyu  
ZHc;8|}  
void CCaptureDlg::OnBrowse() *q(HW  
{ v0 |"[qGb  
 CString str; "z|%V/2b3  
 BROWSEINFO bi; )auuk<  
 char name[MAX_PATH]; f8 L3+u  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); zuBfkW95+  
 bi.hwndOwner=GetSafeHwnd(); Q37zBC 0  
 bi.pszDisplayName=name; `O}bPwa{>  
 bi.lpszTitle="Select folder"; A>}]=Ii/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; bqUQadDB  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0"=}d y  
 if(idl==NULL) x`p3I*_HT5  
  return; :n(!,  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); X]t *  
 str.ReleaseBuffer(); )jN fQ!?/  
 m_Path=str; SP5t=#M6  
 if(str.GetAt(str.GetLength()-1)!='\\') u5dyhx7  
  m_Path+="\\"; o`[X _  
 UpdateData(FALSE); ?a-}1A{  
} XBHv V05mv  
}i2dXC/  
void CCaptureDlg::SaveBmp() WFpR@53Db  
{ ktK/s!bgY  
 CDC dc; &bS!>_9  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); TWTRMc;z+  
 CBitmap bm; IN94[yW{1  
 int Width=GetSystemMetrics(SM_CXSCREEN);  tD}HL_  
 int Height=GetSystemMetrics(SM_CYSCREEN); {,i='!WIm  
 bm.CreateCompatibleBitmap(&dc,Width,Height); hdee]qLS  
 CDC tdc; [KwwhI@3  
 tdc.CreateCompatibleDC(&dc); gc{5/U9H*  
 CBitmap*pOld=tdc.SelectObject(&bm); DX#F]8bWl  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %q,^A+=  
 tdc.SelectObject(pOld); BcD%`vGJ  
 BITMAP btm; e\>g@xE%  
 bm.GetBitmap(&btm); 2E}^'o  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; =;HmU.Uek%  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +v'n[xa1v  
 BITMAPINFOHEADER bih; `pd1'5Hm  
 bih.biBitCount=btm.bmBitsPixel; ;V3d"@R,  
 bih.biClrImportant=0; YiPp#0T[Gx  
 bih.biClrUsed=0; J*O$)K%Hx  
 bih.biCompression=0; ' k[gxk|d2  
 bih.biHeight=btm.bmHeight; G6x2!Ny  
 bih.biPlanes=1; 9<I;9.1S?^  
 bih.biSize=sizeof(BITMAPINFOHEADER); 6u v'{  
 bih.biSizeImage=size; Fgg4QF  
 bih.biWidth=btm.bmWidth; _d/ZaCx'i  
 bih.biXPelsPerMeter=0; ,@*`2I>`  
 bih.biYPelsPerMeter=0; #n}n %  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); H[8P]"*z*i  
 static int filecount=0; Li\BRlebR{  
 CString name; 1_.#'U>  
 name.Format("pict%04d.bmp",filecount++); MOW {g\{\  
 name=m_Path+name; B 9AE*  
 BITMAPFILEHEADER bfh; Sf0[^"7  
 bfh.bfReserved1=bfh.bfReserved2=0; :7Q, `W9  
 bfh.bfType=((WORD)('M'<< 8)|'B'); {01wW1  
 bfh.bfSize=54+size; Nm/Fc   
 bfh.bfOffBits=54; b`sph%&  
 CFile bf; EaGS}=qY5  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Y^f12%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); S=~8nr/V  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));  %;9+`U  
  bf.WriteHuge(lpData,size); xF3H\`{4x  
  bf.Close(); /q8?xP.   
  nCount++; >w=xGb7  
 } 7'xds  
 GlobalFreePtr(lpData); ,W/D0  
 if(nCount==1) S+YbsLf  
  m_Number.Format("%d picture captured.",nCount); v mXY}Ul  
 else :j2_Jn4UP  
  m_Number.Format("%d pictures captured.",nCount); VG`A* Vj  
  UpdateData(FALSE); >zDnJb&"&  
} tY=n("=2  
D`^9 u K  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?V&[U  
{ +(<}`!9M*  
 if(pMsg -> message == WM_KEYDOWN) ~X -.@k'  
 { v+Q# O[  
  if(pMsg -> wParam == VK_ESCAPE) g#ONtY@*U  
   return TRUE; F- n1J?4b  
  if(pMsg -> wParam == VK_RETURN) AFSFXPl "  
   return TRUE; H;n(qBSB  
 } S[ ,r .+  
 return CDialog::PreTranslateMessage(pMsg); h&6x.ps@  
} lEC58`Ws  
P&Q 5ZQb  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]jzINaMav  
{ $0zH2W  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ gZs8BKO  
  SaveBmp(); xQhvs=Zm]  
  return FALSE; S&P5##.u`  
} PF(P"f.?D  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ o^! Zt 9  
 CMenu pop; AcF;5h  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1dK^[;v>3  
 CMenu*pMenu=pop.GetSubMenu(0); `&U ['_%  
 pMenu->SetDefaultItem(ID_EXITICON); gU}?Yy  
 CPoint pt; 7M1*SC  
 GetCursorPos(&pt); U)p P^:|  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?Y~>H 2  
 if(id==ID_EXITICON) rkl/5z??  
  DeleteIcon(); |7I.DBjR;  
 else if(id==ID_EXIT) Bv |Z)G%RR  
  OnCancel(); -j9R%+YW<  
 return FALSE; Q'^]lVY  
} -~h2^Oez  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 6X:- Z 3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) #| 8!0]n'  
 AddIcon(); Sk$ XC  
 return res; T`=N^Ca1!`  
} )N2yhdcqI  
.n`MPx'  
void CCaptureDlg::AddIcon() ";e0-t6:  
{ $sO}l  
 NOTIFYICONDATA data; XI,F^K  
 data.cbSize=sizeof(NOTIFYICONDATA); qD4e] 5  
 CString tip; Q_#X*I  
 tip.LoadString(IDS_ICONTIP); [M2,bc8SJV  
 data.hIcon=GetIcon(0); p$@=N6)I.k  
 data.hWnd=GetSafeHwnd(); GKPqBi[rO  
 strcpy(data.szTip,tip); /kVy#sT|  
 data.uCallbackMessage=IDM_SHELL; 9bXU!l[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; }~-)31e'`  
 data.uID=98; ^ :Q |,oy  
 Shell_NotifyIcon(NIM_ADD,&data); ' n~N*DH  
 ShowWindow(SW_HIDE); h3xX26l  
 bTray=TRUE; 6SsZK)X  
} t Q_}o[  
M42D5|tZc  
void CCaptureDlg::DeleteIcon() R< xxwjt  
{ ^LT9t2  
 NOTIFYICONDATA data; G$4lH>A&  
 data.cbSize=sizeof(NOTIFYICONDATA); 'eqvK|Uj:  
 data.hWnd=GetSafeHwnd(); jt2 m-*aP  
 data.uID=98; Y@u{73H  
 Shell_NotifyIcon(NIM_DELETE,&data); hv .Mf.m  
 ShowWindow(SW_SHOW); $Y aL3n  
 SetForegroundWindow(); =fi.*d?$7  
 ShowWindow(SW_SHOWNORMAL); V|HSIJ#J  
 bTray=FALSE; ;wprHXjq  
} fC%;|V'Nd  
qBX<{[  
void CCaptureDlg::OnChange() >e-XZ2>Sj  
{ L*h X_8J  
 RegisterHotkey(); 1xq1te)  
} Ok({Al1A,w  
60AX2-sdJ,  
BOOL CCaptureDlg::RegisterHotkey() qm]ljut  
{ #>ci!4Gz=Z  
 UpdateData(); 7qXgHrr0|U  
 UCHAR mask=0; ? *I9  
 UCHAR key=0; W.:k E|a.g  
 if(m_bControl) %v~j10e  
  mask|=4; ieS5*@^k  
 if(m_bAlt) q}BQu@'H  
  mask|=2; ~w[zX4@  
 if(m_bShift) ^Z:x poz,  
  mask|=1;  V|?  
  key=Key_Table[m_Key.GetCurSel()]; F<-Pbtw  
 if(bRegistered){ n7<<}wcV  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); "TjR]jnV(  
  bRegistered=FALSE; /'VCJjzZ  
 } ~?b(2gn  
 cMask=mask; YBS]JCO  
 cKey=key; J;q3 fa  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]P<&CEk  
 return bRegistered; /e{Oqhf[n  
} cS ];?tqrA  
4N` MY8',  
  四、小结 <!OP b(g2  
tg8VFH2q.z  
  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。
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