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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: ]O{u tm  
  ?EU\}N J  
  一、实现方法 \V2,pi8'v  
g\GdkiIj  
  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: H0a/(4/xg  
M HL("v(@B  
#pragma data_seg("shareddata") tn|,O.t  
HHOOK hHook =NULL; //钩子句柄 s cdtWA  
UINT nHookCount =0; //挂接的程序数目 7([h4bg{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 +Z!;P Z6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 =2y8 CgLj  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \n9A^v`F/  
static int KeyCount =0; #'OaKt?Z)  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 xt4)Ya  
#pragma data_seg() kCUT ^  
w6 2=06`@  
  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。 Q,Z*8FH=  
fqs]<qi  
  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: 91of~ffh  
 ==/n(LBD  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ha;l(U>  
cKey,UCHAR cMask) "Lh  
{ Gjz[1d  
 BOOL bAdded=FALSE; m}$+Hdk+7  
 for(int index=0;index<MAX_KEY;index++){ BpO9As 1um  
  if(hCallWnd[index]==0){ Fv?=Z-wk  
   hCallWnd[index]=hWnd; j%<}jw[2  
   HotKey[index]=cKey; 6AN)vs}  
   HotKeyMask[index]=cMask; # x>ga  
   bAdded=TRUE; Rq~t4sA:  
   KeyCount++; gM>=%/.  
   break; 4z:#I;  
  } +*&cz  
 } E)ugLluL  
 return bAdded; ]WJfgN4  
} E?PGu!&u  
//删除热键  .Qt4&B  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ql5x2n  
{ OMihXt[  
 BOOL bRemoved=FALSE; U},=LsDsW4  
 for(int index=0;index<MAX_KEY;index++){ I~'*$l  
  if(hCallWnd[index]==hWnd){ ZX b}91rzt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8_uzpeRhJc  
    hCallWnd[index]=NULL; [O-sVYB  
    HotKey[index]=0; SW(q$i  
    HotKeyMask[index]=0; DhI>p0* T  
    bRemoved=TRUE; *.f2VQ~H  
    KeyCount--; &jV_"_3n  
    break; ~9D~7UR  
   } 1xnLB>jP#  
  } G>T')A  
 } tJ& 5tNl  
 return bRemoved; A%Z)wz{  
} (}!C4S3#  
(#(O r  
%-;b u|  
  DLL中的钩子函数如下: yy2Ie  
S"snB/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,D80/2U^  
{ =OTm2:j#yQ  
 BOOL bProcessed=FALSE; i}TwOy<4s  
 if(HC_ACTION==nCode) TUp%FJXA|  
 { BOf1J1  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 F.q|x|9j  
   switch(wParam) z&nZ<ih  
   {  7N2\8kP  
    case VK_MENU: Q"J-tP!  
     MaskBits&=~ALTBIT; 6R}j-1 <n  
     break; a0Oe:]mo\  
    case VK_CONTROL: j?(!^ _!m  
     MaskBits&=~CTRLBIT; 0? bA$y  
     break; 9w;?-  
    case VK_SHIFT: Zu<]bv  
     MaskBits&=~SHIFTBIT; s[3fqdLP&  
     break; XOb}<y)r~  
    default: //judge the key and send message /jD-\,:L}  
     break; i4Z4xTn  
   } Mxz,wfaH>  
   for(int index=0;index<MAX_KEY;index++){ Lx|',6S  
    if(hCallWnd[index]==NULL) Kf7WcJ4b  
     continue; =N.!k Vkl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,ul5,ygA  
    {  5K56!*Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); HV]Ze>}  
     bProcessed=TRUE; WXUkuO  
    } +p:Y=>bTj  
   } eE:&qy^  
  } G`]w?Di4  
  else if((lParam&0xc000ffff)==1){ //有键按下 aSaAC7sFk  
   switch(wParam) u@ N~1@RT|  
   { ysXx%k  
    case VK_MENU: B0mLI%B  
     MaskBits|=ALTBIT; "HQF.#\#  
     break; Yx?aC!5M  
    case VK_CONTROL: CyM}Hc&w  
     MaskBits|=CTRLBIT; Ya4?{2h@+  
     break;  7 Yv!N  
    case VK_SHIFT: mv Ov<x;l  
     MaskBits|=SHIFTBIT; z[!x:# q8`  
     break; EZr6oO@Nc  
    default: //judge the key and send message )Id2GV~2B  
     break; E)YVfM  
   } !G=>ve  
   for(int index=0;index<MAX_KEY;index++){ o<VP'F{p  
    if(hCallWnd[index]==NULL) !Rw&DFU  
     continue; E'dX)J9e$/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6* rcR]  
    { )&1!xF   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); delf ]  
     bProcessed=TRUE; r4k nN 2:  
    } f{Qp  
   } p!"(s/=  
  } 9R]](g#  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 E8[XG2ye  
   for(int index=0;index<MAX_KEY;index++){ +g\;bLT  
    if(hCallWnd[index]==NULL) o'UHStk  
     continue; 3o8\/-*<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Y)p4]>lT+8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Gbb \h  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 |XcH]7Ai"  
   } l)@:T|)c  
  } hLuJWjCV  
 } yFeeG3 n3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); eK_*q -  
} ;) pl{_  
!EFBI+?&  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: y lL8+7W  
|>utWT]S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9Q[>.):  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k ojG- M  
W);W.:F  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: xh'^c^1  
eqFvrESN~=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ePA;:8)_j  
{ G(OFr2M  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6Y?`=kAp  
 { 9O >z4o  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 %x2b0L\g  
  SaveBmp(); )/%S=c  
  return FALSE; :('I)C  
 } GXeAe}T  
 …… //其它处理及默认处理 HF4Lqh'oco  
} XS/n>C  
V*qY"[   
.uDM_ 34  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 fv==Gu%{  
@36S}5Oa  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 zh?4K*>.k  
v ($L  
  二、编程步骤 iG-N  
BED@?:U#h  
  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"; gM, &Spn  
QMb^&?;s  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5b fb!7-[i  
"?H+ u/8$  
  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; Ar`\ N1a  
/.ZaE+  
  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; M:|/ijp N  
Yw^ Gti'<  
  5、 添加代码,编译运行程序。 ;Q90Y&{L=$  
TcZN %  
三、程序代码 *gSO&O=  
-A;w$j6*  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "^"'uO$  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) csvO g[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_  q)oN 2-  
#if _MSC_VER > 1000 E\! n49  
#pragma once >Z"9rF2SW  
#endif // _MSC_VER > 1000 +S0u=u65  
#ifndef __AFXWIN_H__ ,>w}xWSYpG  
#error include 'stdafx.h' before including this file for PCH 6+ANAk  
#endif {Q<0\`A  
#include "resource.h" // main symbols %BICt @E  
class CHookApp : public CWinApp sY^lQN  
{ UT;4U;a,m  
 public: ~,Mr0  
  CHookApp(); xppkLoPK  
  // Overrides %yhI;M^  
  // ClassWizard generated virtual function overrides >;}]pI0T  
  //{{AFX_VIRTUAL(CHookApp) K P6PQgc  
 public: *[ #*n n  
  virtual BOOL InitInstance(); ^Y<M~K972  
  virtual int ExitInstance(); Y eO-gY [b  
  //}}AFX_VIRTUAL T^NJ4L4#  
  //{{AFX_MSG(CHookApp) ;_p fwa4  
  // NOTE - the ClassWizard will add and remove member functions here. \CwtX(6.  
  // DO NOT EDIT what you see in these blocks of generated code ! j`Nh7+qs  
  //}}AFX_MSG &%:*\_2s  
  DECLARE_MESSAGE_MAP() _/ Tlqzp  
}; 5% 'S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); V^vLN[8_\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g z`*|h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N6BNzN}-P  
BOOL InitHotkey(); pj@Yqg/  
BOOL UnInit(); w5 Z2N[hy  
#endif khS/'b  
/x O{ .dr  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. bN!u}DnN  
#include "stdafx.h" p_gA/. v=  
#include "hook.h" PS/W h  
#include <windowsx.h> Kt6C43]7  
#ifdef _DEBUG #~*XDWvIS~  
#define new DEBUG_NEW 6d};|#}  
#undef THIS_FILE k%!VP=c4s  
static char THIS_FILE[] = __FILE__; v*XkWH5  
#endif h,.fM}=H  
#define MAX_KEY 100 OsB?1;:  
#define CTRLBIT 0x04 ;,v.(Z ic  
#define ALTBIT 0x02 ^f6 {0  
#define SHIFTBIT 0x01 <L2GUX36#  
#pragma data_seg("shareddata") -O /T?H  
HHOOK hHook =NULL; "Whwc   
UINT nHookCount =0; 9PCa*,  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey q /:T1a7!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT >*{:l,LH  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey _r[r8M B  
static int KeyCount =0; sU0Stg8&b  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift qkiJ HT  
#pragma data_seg() k_BSY=$e*D  
HINSTANCE hins; EqoASu  
void VerifyWindow(); g@}6N.]#  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _ Q{T';  
//{{AFX_MSG_MAP(CHookApp) W1;=J^<&1  
// NOTE - the ClassWizard will add and remove mapping macros here. C|9[Al  
// DO NOT EDIT what you see in these blocks of generated code! niQ+EAD  
//}}AFX_MSG_MAP i<bxc  
END_MESSAGE_MAP() 5U3qr*/;m  
r:.6"VQu}  
CHookApp::CHookApp() U(P:Je  
{ Z$1.^H.Db  
 // TODO: add construction code here,  I}rGx  
 // Place all significant initialization in InitInstance h&q=I.3O|?  
} b24di  
wFp~  
CHookApp theApp; 2*Va9HP!q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) f@h2;An$w  
{ TG4^_nRl  
 BOOL bProcessed=FALSE; gh'kUZG a  
 if(HC_ACTION==nCode) 89db5Dx  
 { LH,]vuXh  
  if((lParam&0xc0000000)==0xc0000000){// Key up 98h :X%  
   switch(wParam) VZt;P%1;h  
   { cB_pyX9Z  
    case VK_MENU: r)c+".0d^  
     MaskBits&=~ALTBIT; x<Iy<v7-  
     break; uvR0TIF4  
    case VK_CONTROL: 87+.pM|t%  
     MaskBits&=~CTRLBIT; F:M/z#:~  
     break; fJvr+4i4k  
    case VK_SHIFT: - *r[  
     MaskBits&=~SHIFTBIT; HE@-uh  
     break; prqyoCfq  
    default: //judge the key and send message >eEnQ}Y  
     break; F9F" F  
   } 3>H2xh3Y  
   for(int index=0;index<MAX_KEY;index++){ +jv }\Jt  
    if(hCallWnd[index]==NULL) G2=F8kL  
     continue; PIgGXNo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3,%nkW  
    { 9) jo7,VM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Bl=nj.g  
     bProcessed=TRUE; ,n^TN{#  
    } -e &$,R>;  
   } $^] 9  
  } VtD@&N  
  else if((lParam&0xc000ffff)==1){ //Key down D7EXqo  
   switch(wParam) K<RmaXZ  
   { 0BT;"B1  
    case VK_MENU: )o86lH"z  
     MaskBits|=ALTBIT; sWp{Y.  
     break; f%vHx,  
    case VK_CONTROL: l#tS.+B7  
     MaskBits|=CTRLBIT; "L ^TT2  
     break; UB5}i('L  
    case VK_SHIFT: 1d=0q?nH  
     MaskBits|=SHIFTBIT; RA#\x.  
     break; {bW"~_6}  
    default: //judge the key and send message L-`(!j  
     break; Q -M rH   
   } qw9e) `3$  
   for(int index=0;index<MAX_KEY;index++) 9)ACgz&(  
   { v!nm &"  
    if(hCallWnd[index]==NULL) N-]\oMc2  
     continue; N9`y,Cos0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X@i+&Nv"<  
    { rat=)n)"t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [[#xES21F  
     bProcessed=TRUE; >oVc5}  
    } zC<'fT/rG  
   } <+ -V5O^  
  } 7^n,Ti g  
  if(!bProcessed){ &*X3c h  
   for(int index=0;index<MAX_KEY;index++){ 5}<.1ab3V  
    if(hCallWnd[index]==NULL) z\X60T  
     continue; H?rSP0.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7yo|ie@S  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1-4   
   } Q,OkO?uY  
  } ]R97n|s_  
 } =~,$V<+c  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %{N>c:2I$  
} sZ0g99eX  
L+v8E/W  
BOOL InitHotkey() xmCm3ekmpC  
{ ~+sne7 6 U  
 if(hHook!=NULL){ U;x99Go:  
  nHookCount++; ]$*$0  
  return TRUE; HY*l4QK  
 } Q3 K;kS  
 else k/$Ja;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); SS >:Sw  
  if(hHook!=NULL) oA(. vr  
   nHookCount++; ]s1TJw [B  
  return (hHook!=NULL); :7HVBH  
} ~Da >{zHt  
BOOL UnInit() '?&B5C  
{ ]hCWe0F  
 if(nHookCount>1){ 9nP*N`  
  nHookCount--; daaga}]d  
  return TRUE; E#yCcC!wMY  
 } [X0k{FR  
 BOOL unhooked = UnhookWindowsHookEx(hHook); g @c=Bt$  
 if(unhooked==TRUE){ &. |;yt%v  
  nHookCount=0; TKj/6Jz|  
  hHook=NULL; u i s:\Uc  
 } },?-$eyX  
 return unhooked; 7H8GkuO  
} O^QR;<t'  
P^'>dOI0w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9+WY@du+  
{ `D&#U'wB   
 BOOL bAdded=FALSE; Bbn832iMUY  
 for(int index=0;index<MAX_KEY;index++){ #o(?g-3  
  if(hCallWnd[index]==0){ *!-}lc^4  
   hCallWnd[index]=hWnd; fJSV)\e0  
   HotKey[index]=cKey; (.jO:#eE%  
   HotKeyMask[index]=cMask; ?^e*UJNM  
   bAdded=TRUE; E9~&f^f  
   KeyCount++; ZwY`x')  
   break; mSVX4XW<  
  } `<]P"G  
 } DzX6U[=  
 return bAdded; v.~Nv@+kR  
} jgZX ~D  
I1eb31<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) E 6>1Fm8%V  
{ g4BwKENM  
 BOOL bRemoved=FALSE; B1 jH.(  
 for(int index=0;index<MAX_KEY;index++){ UgOGBj,&5W  
  if(hCallWnd[index]==hWnd){ pn ~/!y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ HQ-N!pf9  
    hCallWnd[index]=NULL; &;uGIk>s  
    HotKey[index]=0; baO&n  
    HotKeyMask[index]=0; W#oEF/G  
    bRemoved=TRUE; )[^:]}%r  
    KeyCount--; (+]Ig> t  
    break; 3RTB~K8:{  
   } #=)?s 8T  
  } UC?2mdLt^  
 } @n ~ND).  
 return bRemoved; RN cI]oJ  
} <E(-QJ  
o$qFa9|Ec?  
void VerifyWindow() Yp?a=R  
{ uMq\];7I  
 for(int i=0;i<MAX_KEY;i++){ 6 ^6uK  
  if(hCallWnd!=NULL){ {kY`X[fvZ  
   if(!IsWindow(hCallWnd)){ z~A(IQO  
    hCallWnd=NULL; 1*eWvYo1  
    HotKey=0; A-@-?AR  
    HotKeyMask=0; 6832N3=  
    KeyCount--; u:{. Hn`  
   }   t`&s  
  } unbcz{&Hb[  
 } Ay[9k=q]  
} [\ w>{  
`qYc#_ELv  
BOOL CHookApp::InitInstance() xr1I8 5kM  
{ Si%Eimiq  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Fr E/K_L  
 hins=AfxGetInstanceHandle(); i >/@]2  
 InitHotkey(); st1M.}  
 return CWinApp::InitInstance(); r(/P||`l  
} $7k04e@ ]  
QVA!z##  
int CHookApp::ExitInstance() HjE Tinm"  
{ J[_?>YJ  
 VerifyWindow(); 4=#QN  
 UnInit(); E!(`275s  
 return CWinApp::ExitInstance(); CsQ}P)  
} _#\5]D~""  
z;@S_0M,Z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @?($j)9}  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3`C3+  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~ jrU#<'G9  
#if _MSC_VER > 1000 y|2g"J  
#pragma once iR4,$Nn>  
#endif // _MSC_VER > 1000 8mQd*GGu1  
mSvTnd8  
class CCaptureDlg : public CDialog nG(|7x   
{ Xb07 l3UG  
 // Construction s$=B~l  
 public: m<VL19o>R  
  BOOL bTray; B+e~k?O]1  
  BOOL bRegistered; xX67bswG  
  BOOL RegisterHotkey(); WY ^K7U  
  UCHAR cKey; BfO}4  
  UCHAR cMask; :Q%yW%St$  
  void DeleteIcon(); EWvid4QEi  
  void AddIcon(); 9DocId.  
  UINT nCount; 7C 6BZ$(  
  void SaveBmp(); %%-Tjw o  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9"l%tq_  
  // Dialog Data 9i xnf=$Jp  
  //{{AFX_DATA(CCaptureDlg) i~M.F=I5  
  enum { IDD = IDD_CAPTURE_DIALOG }; {UjIxV(J  
  CComboBox m_Key; rH9|JEz  
  BOOL m_bControl; ZB h@%A  
  BOOL m_bAlt; 'XjHB!!hU  
  BOOL m_bShift; J1wGK|F~  
  CString m_Path; PeR<FSF ,i  
  CString m_Number; }Q,C;!'"  
  //}}AFX_DATA r|sy_Sk/{  
  // ClassWizard generated virtual function overrides <MDFf nj  
  //{{AFX_VIRTUAL(CCaptureDlg) c9TkIe  
 public: >5YYij5Aj  
  virtual BOOL PreTranslateMessage(MSG* pMsg); s!zr>N"  
 protected: 1,sO =p)Yg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _KlPbyLU  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )Z`viT  
  //}}AFX_VIRTUAL ieK'<%dxF  
  // Implementation ]&%X(jWyn  
 protected: pz z`4VS:  
  HICON m_hIcon;  6-E4)0\  
  // Generated message map functions FV<^q|K/(]  
  //{{AFX_MSG(CCaptureDlg) l[ OQo|_  
  virtual BOOL OnInitDialog(); )I1V 2k$n  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); S&g -  
  afx_msg void OnPaint(); < oG\)!O  
  afx_msg HCURSOR OnQueryDragIcon(); gj(l&F *@  
  virtual void OnCancel(); Vf* B1Zb  
  afx_msg void OnAbout(); )fcpE,g'  
  afx_msg void OnBrowse(); [;\< 2=H  
  afx_msg void OnChange(); r4qV}-E  
 //}}AFX_MSG UM;bVf?  
 DECLARE_MESSAGE_MAP() Xv;ZAa  
}; D_`)T;<Sp  
#endif w+ )GM  
xo@/k   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {hp@j#  
#include "stdafx.h" S+=@d\S}"  
#include "Capture.h" D"><S<C\C  
#include "CaptureDlg.h" &rE l  
#include <windowsx.h> oz7udY=]0  
#pragma comment(lib,"hook.lib") OTbjZ(  
#ifdef _DEBUG {d5ur@G1  
#define new DEBUG_NEW  AHg4kG  
#undef THIS_FILE ?@7|Q/  
static char THIS_FILE[] = __FILE__; ErUk>V  
#endif l<:)rg^,  
#define IDM_SHELL WM_USER+1 eFI9S.6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >WG91b<Xq  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *v-xC5L1\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; E;*TRr><  
class CAboutDlg : public CDialog $+yQ48Wq  
{ 3xR#,22:}  
 public: H<3b+Sg  
  CAboutDlg(); 9U%}"uE  
  // Dialog Data BJ;cF"Kp  
  //{{AFX_DATA(CAboutDlg) T%xL=STJNy  
  enum { IDD = IDD_ABOUTBOX }; !)1Zp*  
  //}}AFX_DATA >@\?\!Go  
  // ClassWizard generated virtual function overrides e(5Px!B  
  //{{AFX_VIRTUAL(CAboutDlg) ^ C#bW <T  
 protected: dtXJ<1:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dEl3?~  
  //}}AFX_VIRTUAL )HiTYV)]'  
  // Implementation E.*OA y  
 protected: GeR -k9  
  //{{AFX_MSG(CAboutDlg) 9!<3qx/  
  //}}AFX_MSG 3). c [F^l  
  DECLARE_MESSAGE_MAP() mr\L q~*c  
}; m,"tdVo.  
G@6,O-Sj  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) "U~@o4u;  
{ <cd%n-  
 //{{AFX_DATA_INIT(CAboutDlg) c35vjYQx0  
 //}}AFX_DATA_INIT o%s}jBo}  
} >Qu^{o  
@g` ,'r  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) JaN_[ou  
{ `9NnL.w!  
 CDialog::DoDataExchange(pDX); I ywx1ac  
 //{{AFX_DATA_MAP(CAboutDlg) GOgT(.5  
 //}}AFX_DATA_MAP  PW\FcT  
} V)?g4M3}  
i(#c Yb  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rm;"98~zJ?  
 //{{AFX_MSG_MAP(CAboutDlg) H%jIjf  
 // No message handlers 4E94W,1%,Y  
 //}}AFX_MSG_MAP LPgI"6cP  
END_MESSAGE_MAP() = nN*9HRD  
|xC TX  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) X64I~*  
: CDialog(CCaptureDlg::IDD, pParent) Rs`Y'_B  
{ LU=)\U@Q  
 //{{AFX_DATA_INIT(CCaptureDlg) f*@:{2I.v  
  m_bControl = FALSE; Z1}zf( JU  
  m_bAlt = FALSE; ooxzM `  
  m_bShift = FALSE; _^A NJ7  
  m_Path = _T("c:\\"); YR`rg;n#  
  m_Number = _T("0 picture captured."); F#R\Ot,hv  
  nCount=0;  K8we*  
  bRegistered=FALSE; Z9EQ|WfS#-  
  bTray=FALSE; _ o3}Ly}  
 //}}AFX_DATA_INIT c.> (/  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 fXQRsL8 ]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "C|l3X'  
} G+p>39P   
+u)$o  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) PA[Rhoit,  
{ s&hP^tKT  
 CDialog::DoDataExchange(pDX); `h]f(  
 //{{AFX_DATA_MAP(CCaptureDlg) Y3&ecEE  
  DDX_Control(pDX, IDC_KEY, m_Key); F'Vl\qPt  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); sM_e_e  
  DDX_Check(pDX, IDC_ALT, m_bAlt); oVgNG!/c0  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); *a.*Ha  
  DDX_Text(pDX, IDC_PATH, m_Path); kV<)>Gs  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Q*(C)/QW  
 //}}AFX_DATA_MAP Bbp9Q,4  
} >C66X?0cd  
1W7BN~p14  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ~;s)0M  
//{{AFX_MSG_MAP(CCaptureDlg) i)DXb  
 ON_WM_SYSCOMMAND() SHh(ujz,  
 ON_WM_PAINT() X"GQ^]$O  
 ON_WM_QUERYDRAGICON() Hvk?(\x  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) QyQ8M1m  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) w\4m -Z{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) !X_~|5.  
//}}AFX_MSG_MAP e@By@r&nql  
END_MESSAGE_MAP() %j; cXN  
"|rqt.f2[  
BOOL CCaptureDlg::OnInitDialog() U]$3NIe  
{ boon =;{p  
 CDialog::OnInitDialog(); PTqS L]  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); TR20{8"  
 ASSERT(IDM_ABOUTBOX < 0xF000); <ZdNPcT<s  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }aIf IJ  
 if (pSysMenu != NULL) c,ek]dTj  
 { n-Y'LK40Os  
  CString strAboutMenu; 0&~u0B{  
  strAboutMenu.LoadString(IDS_ABOUTBOX); >c eU!=>  
  if (!strAboutMenu.IsEmpty()) 3!W&J  
  { RkM!BcB  
   pSysMenu->AppendMenu(MF_SEPARATOR); bq ]a8tSB  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {xH@8T$DX  
  } I-"{m/PEdg  
 } n5/Q)*e0'#  
 SetIcon(m_hIcon, TRUE); // Set big icon Y6a|\K|  
 SetIcon(m_hIcon, FALSE); // Set small icon J_$~OEC~  
 m_Key.SetCurSel(0); bS<p dOX_  
 RegisterHotkey(); 0rUf'S ?K  
 CMenu* pMenu=GetSystemMenu(FALSE); Awh)@iTL  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); m ws.)  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); A@r,A?(  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); G.T1rUh=  
 return TRUE; // return TRUE unless you set the focus to a control !HYqM(|{.  
} xcA:Q`c.{  
D$;/ l}s?  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 89bKnsV  
{ }fZBP]<I(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) VCO/s9AL  
 { -%|I  
  CAboutDlg dlgAbout; m6D4J=59  
  dlgAbout.DoModal(); (#qVtN`t  
 } N%+M+zEJ  
 else <Z;BB)I&C`  
 { 70eN]OY  
  CDialog::OnSysCommand(nID, lParam); :Ib\v88WIv  
 } d\M !o*U  
} `314.a6S  
,~#hHhR_  
void CCaptureDlg::OnPaint() J)o%83//  
{ ,?+yu6eLb  
 if (IsIconic()) `RRORzXoS  
 { +l(}5(wc  
  CPaintDC dc(this); // device context for painting 3OlY Ml  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); .M lE1n'  
  // Center icon in client rectangle Z)%p,DiNM  
  int cxIcon = GetSystemMetrics(SM_CXICON); e`^j_V nEH  
  int cyIcon = GetSystemMetrics(SM_CYICON); u.6%n. g  
  CRect rect; F ReK  
  GetClientRect(&rect); T*m_rDDt  
  int x = (rect.Width() - cxIcon + 1) / 2; 9`AQsZ2  
  int y = (rect.Height() - cyIcon + 1) / 2; U^D7T|P$V  
  // Draw the icon om6R/K  
  dc.DrawIcon(x, y, m_hIcon); ,fn=%tiUk  
 } }=gGs  
 else <*P1Sd.  
 { O/Vue  
  CDialog::OnPaint(); g,nEiL  
 } XJ9>a-{  
} 2Z~o frj  
6%-2G@6d  
HCURSOR CCaptureDlg::OnQueryDragIcon() ,")7uMZaF\  
{ ZUycJ-[  
 return (HCURSOR) m_hIcon; [aC(Ga}  
} ||f 4f3R'  
4.TG&IQ nN  
void CCaptureDlg::OnCancel() U' Cp3>  
{ DNPK1e3a{  
 if(bTray) <3KrhhH  
  DeleteIcon(); ;<\*(rUe  
  CDialog::OnCancel(); @Klj!2cv$  
} mwxJ#  
5|Qr"c$p  
void CCaptureDlg::OnAbout() ]CjODa  
{ V]2Q92  
 CAboutDlg dlg; -SQYr  
 dlg.DoModal();  ~$B ,K]  
} Iu8=[F>  
P1<;:!8'  
void CCaptureDlg::OnBrowse() .JE7vPv%!  
{ H UjmJu6f{  
 CString str; rYl37.QE  
 BROWSEINFO bi; !wgj$5Rw.  
 char name[MAX_PATH]; )'JSu=Ej  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /.r($S g^  
 bi.hwndOwner=GetSafeHwnd(); N@g+51ye  
 bi.pszDisplayName=name; '5%DKz  
 bi.lpszTitle="Select folder"; ` Oi@7 /oT  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7_RU*U^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #p]O n87>  
 if(idl==NULL) (_* a4xGF  
  return; s= :n<`Z2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !s$fqn 6  
 str.ReleaseBuffer(); zv41Yv!x}  
 m_Path=str; o9/P/PZ\X  
 if(str.GetAt(str.GetLength()-1)!='\\') e042`&9=Ic  
  m_Path+="\\"; Rd2[xk  
 UpdateData(FALSE); (<12&=WxE  
} wZ^/-  
4{|lzo'&  
void CCaptureDlg::SaveBmp() J [1GP_  
{ x;+,lP  
 CDC dc; x K/`XY  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); wgrYZ^]  
 CBitmap bm; rO NLbrj  
 int Width=GetSystemMetrics(SM_CXSCREEN); Hl#o& *Ui"  
 int Height=GetSystemMetrics(SM_CYSCREEN); 3]'3{@{} H  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #r1x0s40D  
 CDC tdc; gU`QW_{  
 tdc.CreateCompatibleDC(&dc); 9} vWTt0  
 CBitmap*pOld=tdc.SelectObject(&bm); q9OIw1xQr*  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); k@w&$M{tPF  
 tdc.SelectObject(pOld); E^g6,Y:i9  
 BITMAP btm; #\}hN~@F  
 bm.GetBitmap(&btm); wdg[pt />  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 1||e !W  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); V1ug.Jv^  
 BITMAPINFOHEADER bih; @wo9;DW`  
 bih.biBitCount=btm.bmBitsPixel; &c]x;#-y  
 bih.biClrImportant=0; ;j$84o{  
 bih.biClrUsed=0;  *q^'%'  
 bih.biCompression=0; ,"D1!0  
 bih.biHeight=btm.bmHeight; G 5)?!  
 bih.biPlanes=1; _?{2{^v  
 bih.biSize=sizeof(BITMAPINFOHEADER); &rn,[w_F[  
 bih.biSizeImage=size; _2|,j\f;L  
 bih.biWidth=btm.bmWidth; \1tce`+  
 bih.biXPelsPerMeter=0; nP}/#Wy  
 bih.biYPelsPerMeter=0; |aZ^K\yIF  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /fX]Yu  
 static int filecount=0; $1axZ~8sS  
 CString name; O @w=  
 name.Format("pict%04d.bmp",filecount++); H:|yu  
 name=m_Path+name; /( q*  
 BITMAPFILEHEADER bfh; 2]@U$E='s  
 bfh.bfReserved1=bfh.bfReserved2=0; z >pq<}R6  
 bfh.bfType=((WORD)('M'<< 8)|'B'); U9JqZ!  
 bfh.bfSize=54+size; m_pK'jc  
 bfh.bfOffBits=54; @FQ@* XD  
 CFile bf; &?~> I[^~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ -/h$Yb  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); , 7}Ri  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 4F'@yi^Gt  
  bf.WriteHuge(lpData,size); >6@UjGj54  
  bf.Close(); Y$(G)Fs  
  nCount++; w'UP#vT5&  
 } |_O1V{Q=  
 GlobalFreePtr(lpData); n44j]+P  
 if(nCount==1) 4-m}W;igu  
  m_Number.Format("%d picture captured.",nCount); ddw!FH2W (  
 else !XK p_v  
  m_Number.Format("%d pictures captured.",nCount); 5~\W!|j/  
  UpdateData(FALSE); tvd/Y|bV=  
} )&*&ZL0  
Jap v<lV%  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0hPm,H*Y]  
{ aUd6 33  
 if(pMsg -> message == WM_KEYDOWN) h322^24-2  
 { il:+O08_  
  if(pMsg -> wParam == VK_ESCAPE) @.%ll n  
   return TRUE; WhkE&7Gk  
  if(pMsg -> wParam == VK_RETURN) +jHL==W&  
   return TRUE; U7{, *  
 } `/0FXb 8h  
 return CDialog::PreTranslateMessage(pMsg); 0n5N-b?G-@  
} ]Fa VKC~3  
GLEGyT?~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {~Phc 2z  
{ %R}}1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Rrsz{a  
  SaveBmp(); UA{A G;  
  return FALSE; rl!c\  
} `DEz ` D  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3x eW!~  
 CMenu pop; gPDc6{/C<  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;0ake%v]  
 CMenu*pMenu=pop.GetSubMenu(0);  M7hff4c  
 pMenu->SetDefaultItem(ID_EXITICON); 63ht|$G  
 CPoint pt; RsY|V|<  
 GetCursorPos(&pt); `?~pk)<C].  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9HWtdJ+^C=  
 if(id==ID_EXITICON) 'DVPx%p  
  DeleteIcon(); ~~>D=~B0'  
 else if(id==ID_EXIT) >YD? pDPb/  
  OnCancel(); d6wsT\S  
 return FALSE; [0  3Aej  
} 1XwbsKQ}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,b2Cl[  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) FLi)EgZXt  
 AddIcon(); M,NYF`;a  
 return res; ZE4~rq/W  
} mlX^5h'  
i :@00)V{,  
void CCaptureDlg::AddIcon() -(~CZ  
{ -$t#AYKz  
 NOTIFYICONDATA data; X5=Dc+  
 data.cbSize=sizeof(NOTIFYICONDATA); ]5B5J  
 CString tip; k|1/gd5  
 tip.LoadString(IDS_ICONTIP); 1H%LUA  
 data.hIcon=GetIcon(0); 5v8_ji#l[  
 data.hWnd=GetSafeHwnd(); |_Z(}% <o  
 strcpy(data.szTip,tip); MH1??vW  
 data.uCallbackMessage=IDM_SHELL; 1)H+iN|im/  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; DjtUX>e  
 data.uID=98; 1Qv5m^>vj  
 Shell_NotifyIcon(NIM_ADD,&data); ]r{y+g|  
 ShowWindow(SW_HIDE); h8Kri}z;M  
 bTray=TRUE; 6!O~:\`DJ  
} lkOugjI  
`9%@{Ryo  
void CCaptureDlg::DeleteIcon() Kh}#At^C8e  
{ 5^*I]5t8  
 NOTIFYICONDATA data; Y@F@k(lOo  
 data.cbSize=sizeof(NOTIFYICONDATA); mZ'`XAS~;  
 data.hWnd=GetSafeHwnd(); c V=h 8F  
 data.uID=98; (m25ZhW  
 Shell_NotifyIcon(NIM_DELETE,&data); G-xW&wC-  
 ShowWindow(SW_SHOW); u05Zg*.[  
 SetForegroundWindow(); F:1w%#6av  
 ShowWindow(SW_SHOWNORMAL); Js ~_8  
 bTray=FALSE; qf7 lQovK  
} wm !Y5  
BH0].-)[y!  
void CCaptureDlg::OnChange() YR^J7b\  
{ ma,H<0R  
 RegisterHotkey(); {+!m]-s  
} *CMe:a  
~+7q.XL$$K  
BOOL CCaptureDlg::RegisterHotkey() 0DV .1  
{ 5_9mA4gs@  
 UpdateData(); ^,qi` Tk  
 UCHAR mask=0; 7NE"+EP\{2  
 UCHAR key=0; ZXh6Se4o  
 if(m_bControl) FY@ErA7~  
  mask|=4; UW_fn  
 if(m_bAlt) =E,^ +`M  
  mask|=2; *xI0hFJIM  
 if(m_bShift) GMyzQ]@}  
  mask|=1; n3 -5`Jti  
  key=Key_Table[m_Key.GetCurSel()]; p<: bP w  
 if(bRegistered){ QJ\ o"c  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); F$F,I,$ "  
  bRegistered=FALSE; ?I6!m~  
 } \ym3YwP4/:  
 cMask=mask; &;DK^ta*P  
 cKey=key; $i;%n1VBg  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);  v=R=K  
 return bRegistered; V)mitRaV  
} Vf:/Kokq  
1Ue )&RW  
  四、小结 xy5&}_Y  
DY/xBwIF  
  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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