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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: Me;@/;c(   
  s7e)Mt  
  一、实现方法 p8o ~  
jU |0!]  
  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: Y4e64`V)  
h?5$-#q~  
#pragma data_seg("shareddata") xa#0y   
HHOOK hHook =NULL; //钩子句柄 H RJz  
UINT nHookCount =0; //挂接的程序数目 lp3 A B  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7K>FC T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 &;S.1tg  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey t-*oVX3D  
static int KeyCount =0; H6X]D"Y,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Ve#VGlI  
#pragma data_seg() Vui5ZK  
teH $hd-q  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 FZ'|z8Dm  
< ek_n;R  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: *jM~VTXwt  
z6 2gF|Uj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR F#>?i}  
cKey,UCHAR cMask) ig:,:KN  
{ A ^@:Ps  
 BOOL bAdded=FALSE; nQ 2V  
 for(int index=0;index<MAX_KEY;index++){ k_?xi OSh  
  if(hCallWnd[index]==0){ xtMN<4#E  
   hCallWnd[index]=hWnd; xzTTK+D@  
   HotKey[index]=cKey; N+%E=D>  
   HotKeyMask[index]=cMask; :=WiT_M  
   bAdded=TRUE; RO"c+|Py  
   KeyCount++; E:/G!1  
   break; :bFCnV`Q  
  } }UNRe]ft$  
 } roT$dL P)w  
 return bAdded; Fw? ;Y%  
} ]4wyuP,up  
//删除热键 >F+Mu-^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?JO x9;`  
{ I) Y ^_&=  
 BOOL bRemoved=FALSE; ,4wVQ(,?cd  
 for(int index=0;index<MAX_KEY;index++){ )u?pqFH  
  if(hCallWnd[index]==hWnd){ }mQ7N&cC  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]ZKmf}A)1P  
    hCallWnd[index]=NULL; ZRN*.  
    HotKey[index]=0; .|`J S?L[  
    HotKeyMask[index]=0; d 1VNTB  
    bRemoved=TRUE; CnyCEIO-  
    KeyCount--; {E`[ `Kf  
    break; m?bd6'&FR  
   } YSERQo  
  } # 12  
 } nTxeV%  
 return bRemoved;  *X- 6]C  
} 5W_u|z+/g  
S\=j; Uem  
jq#gFt*  
  DLL中的钩子函数如下: PhL}V|W>  
Q`k=VSUk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ep`WYR|B  
{ tj/X 7|  
 BOOL bProcessed=FALSE; (PAkKY}  
 if(HC_ACTION==nCode) 4#Wczk-b  
 { `(s&H8x#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 P @N7g`u3}  
   switch(wParam) >MD['=J[d  
   {  6U[`CGL66  
    case VK_MENU: WBT/;),}:  
     MaskBits&=~ALTBIT; R{Q*"sf  
     break; U5Say3r  
    case VK_CONTROL: R&}"En`$s  
     MaskBits&=~CTRLBIT; F|p&v7T  
     break; 1sp>UBG  
    case VK_SHIFT: j}R!'m(P'  
     MaskBits&=~SHIFTBIT; <y#-I%ed  
     break; H0<(j(JK  
    default: //judge the key and send message |>o]+V  
     break; Tbv", b  
   } >PdYQDyVS  
   for(int index=0;index<MAX_KEY;index++){ 8OE=7PK  
    if(hCallWnd[index]==NULL) [@d$XC]Qz  
     continue; KP{|xQ>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B1dVHz#  
    { 7x` dEi<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); T\7z87Q  
     bProcessed=TRUE; w@w(AFV9/  
    } i}teY{pyc  
   } s;V~dxAiv  
  } KW.*LoO  
  else if((lParam&0xc000ffff)==1){ //有键按下 v5 STe`  
   switch(wParam) 9}p>='  
   { .?{rd3[ec  
    case VK_MENU: xVk|6vA7  
     MaskBits|=ALTBIT; GPBp.$q+B  
     break; QHOA__?  
    case VK_CONTROL: 9qc<m'MZ  
     MaskBits|=CTRLBIT; G"w ?{W @  
     break; 0kxo  
    case VK_SHIFT: "F A&Qm0  
     MaskBits|=SHIFTBIT; R gY-fc0  
     break; JGQlx-qv  
    default: //judge the key and send message M#o.$+Uh  
     break; >i^8K U  
   } On x[}x  
   for(int index=0;index<MAX_KEY;index++){ zAT7 ^q^  
    if(hCallWnd[index]==NULL) wh4ik`S 1  
     continue; ;UuCSfs{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O[ tD7 !1  
    { h tC~BK3(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^Ud1 ag!-  
     bProcessed=TRUE; \a\-hm  
    } U9k;)fK  
   } "f^s*I  
  } -*xm<R],  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 g}>Sc=e <  
   for(int index=0;index<MAX_KEY;index++){ { No*Z'X  
    if(hCallWnd[index]==NULL) x'IVP[xh`A  
     continue; 8m% +O#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) )I7~ <$w  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4C@ .X[r  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 3ZdheenK9  
   } _dOR-<  
  } fik*-$V`  
 } GIXxOea1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {Up@\M  
} TZ#(G  
<T]BSQk  
  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: ZlaU+Y(_[  
7ux0|l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {OFbU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cp D=9k!*K  
&5JTcMC^  
  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: [O)(0  
Gk~QgD/Pix  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p4l^b[p  
{ YrlOvXW  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) "^sh:{  
 {  zxN,ys  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 cuv?[ M  
  SaveBmp(); kU uDA><1  
  return FALSE; +/!kL0[v  
 } +; /]'  
 …… //其它处理及默认处理 \:>GF-Z(  
} `qP <S  
FR%9Qb7  
h)S223[  
  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。 Md!L@gX6<  
IE/F =Wr  
  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。 <ezv  
K@uUe3  
  二、编程步骤 tJ:]ne   
ey'x3s_  
  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"; <cC0l-=  
Djv0]Sm^!  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; i WCR 5c=  
BS-nny  
  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; w[`2t{^j  
Po+I!TL'  
  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; #<_gY  
sK1YmB :~a  
  5、 添加代码,编译运行程序。 oWCy%76@  
4sU*UePr  
三、程序代码 D,cGW,2Nv  
Kob i!  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL I~:vX^%9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) w8MQA!=l  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ -TIrbYS`  
#if _MSC_VER > 1000 $raxf80A  
#pragma once &x~&]  
#endif // _MSC_VER > 1000 8GRp1'\Hi  
#ifndef __AFXWIN_H__ jC<1bf$K  
#error include 'stdafx.h' before including this file for PCH syuW>Z8s  
#endif 2'R ;z< _  
#include "resource.h" // main symbols ?-'m#5i"  
class CHookApp : public CWinApp /-Saz29f^Q  
{ FE}!I  
 public: >j5,Z]  
  CHookApp(); h8R3N?S3#  
  // Overrides R$[nYw  
  // ClassWizard generated virtual function overrides XwI~ 0  
  //{{AFX_VIRTUAL(CHookApp) ~ ^)D#Lo  
 public: xZmO^F5KHj  
  virtual BOOL InitInstance(); G)p pkH`qj  
  virtual int ExitInstance(); r'!HWR  
  //}}AFX_VIRTUAL *t_"]v-w  
  //{{AFX_MSG(CHookApp) "EA6RFRD  
  // NOTE - the ClassWizard will add and remove member functions here. N?Wx-pK  
  // DO NOT EDIT what you see in these blocks of generated code ! X<pg^Y0  
  //}}AFX_MSG >[,ywRJ#_}  
  DECLARE_MESSAGE_MAP() 'brt?oZ%  
}; Y}db<Cz X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 5|T[:m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RQaB _bg7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pKSn 3-A  
BOOL InitHotkey(); to}g4  
BOOL UnInit(); Dt1v`T~=?  
#endif nC-=CMWWr  
k,) xv?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. i5f8}`w  
#include "stdafx.h" $P=B66t ^  
#include "hook.h" + F{hFuHV  
#include <windowsx.h> D'{NEk@  
#ifdef _DEBUG  18(hrj  
#define new DEBUG_NEW s^atBqw,  
#undef THIS_FILE (P( =6-0  
static char THIS_FILE[] = __FILE__; E5^P*6c(  
#endif  O=,[u?  
#define MAX_KEY 100 ;$`5L"I5$  
#define CTRLBIT 0x04 ' 7lHWqN<  
#define ALTBIT 0x02 QNH-b9u>8  
#define SHIFTBIT 0x01 nRP|Qt7>  
#pragma data_seg("shareddata") & XS2q0-x  
HHOOK hHook =NULL; }6Ut7J]a|  
UINT nHookCount =0; 1z .  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey AXnuXa(j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT FU{$oCh/5  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey xiWP^dIF  
static int KeyCount =0; I:~KF/q  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift goE \C  
#pragma data_seg() vb o| q[z  
HINSTANCE hins; 3YKJN4  
void VerifyWindow(); xj6@85^  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >GbCRN~  
//{{AFX_MSG_MAP(CHookApp) 3q$[r_   
// NOTE - the ClassWizard will add and remove mapping macros here. h/)kd3$*'  
// DO NOT EDIT what you see in these blocks of generated code! *3uBS2Ld  
//}}AFX_MSG_MAP > whcZ.8  
END_MESSAGE_MAP() -qI8zs$:5  
4AIo,{(  
CHookApp::CHookApp() 5%qq#;[ n  
{  X.q,  
 // TODO: add construction code here, 9.:]eL  
 // Place all significant initialization in InitInstance &dH[lB  
} 5Kadh2nz  
& bKl(,  
CHookApp theApp; aUy!(Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) w5C$39e\G  
{ m;_gNh8Ee  
 BOOL bProcessed=FALSE; \ oY/hT_  
 if(HC_ACTION==nCode) ~wtK(U  
 { cEdf&*_-'I  
  if((lParam&0xc0000000)==0xc0000000){// Key up uwL^Tq}Yh  
   switch(wParam) cuw 7P  
   { e9LP!"@EY  
    case VK_MENU: S'%|40U  
     MaskBits&=~ALTBIT; -qbx:Kk (  
     break; [NxC7p:Lo  
    case VK_CONTROL: BR*'SF\T  
     MaskBits&=~CTRLBIT; 4# L}&  
     break; d@0p<at>~  
    case VK_SHIFT: L:.z FW,  
     MaskBits&=~SHIFTBIT; Bf21u 9  
     break; 8Q{"W"]O7  
    default: //judge the key and send message NsPAWI|4  
     break; %Tv2op  
   } Q[vQT?J7  
   for(int index=0;index<MAX_KEY;index++){ bpr  
    if(hCallWnd[index]==NULL) vvTQ!Aa  
     continue; X7bS{GT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !J6;F}Pd/  
    { '%H\ k5^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); A_y]6~Mu?~  
     bProcessed=TRUE; Nf]h8d~  
    } [$Dzf<0  
   } ~6Xr^An/Z  
  } V 6*ohC:  
  else if((lParam&0xc000ffff)==1){ //Key down >=6 j:  
   switch(wParam) h 7P<3m}  
   { n@JZ2K4  
    case VK_MENU: s3/iG37K  
     MaskBits|=ALTBIT; nF)b4`Nd  
     break; f@j)t%mh  
    case VK_CONTROL: f`gs/R  
     MaskBits|=CTRLBIT; qk{+Y  
     break; @W1F4HYds  
    case VK_SHIFT: m8T< x>  
     MaskBits|=SHIFTBIT; n9%&HDl4  
     break; 9n#lDL O  
    default: //judge the key and send message *QGyF`Go{  
     break; HM]mOmL90N  
   } V JJ6q  
   for(int index=0;index<MAX_KEY;index++) {f(RYj  
   { m]?C @ina  
    if(hCallWnd[index]==NULL) .eHOG]H  
     continue; V0/PjD,jP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T2dv!}7p  
    { QVR8b3T@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L25v7U  
     bProcessed=TRUE; {@&%Bq*&  
    } xXRlQ|84  
   } 6Mj (B*c  
  } Z1y=L$t8  
  if(!bProcessed){ Mb^E  
   for(int index=0;index<MAX_KEY;index++){ ,J4rKGG  
    if(hCallWnd[index]==NULL) ubQbEv{(,  
     continue; WAUgbImc{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Xl %ax!/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )ppIO"\  
   } PB(q9gf"1}  
  } BY5ODc$  
 } \Q!I;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &cSZ?0R  
} RYyM;<9F  
y2o~~te  
BOOL InitHotkey() A-&XgOL  
{ v,d bto0  
 if(hHook!=NULL){ @OGHS}-\  
  nHookCount++; y,xJ5BI$  
  return TRUE; !de`K |  
 } 3JFX~"rV9I  
 else BW x=Q  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); tJvs ?eZ)  
  if(hHook!=NULL) h0aK}`/a  
   nHookCount++; )?MUUI:  
  return (hHook!=NULL); eUVhNg  
} 63fg l+  
BOOL UnInit() UGP,/[XI  
{ aCF=Og  
 if(nHookCount>1){ g2%fla7r  
  nHookCount--; wZ%a:Z4TcM  
  return TRUE; #oD;?Mi  
 } b[rVr J  
 BOOL unhooked = UnhookWindowsHookEx(hHook); a{@gzB  
 if(unhooked==TRUE){ Db K(Rh_ K  
  nHookCount=0; G@+R!IG  
  hHook=NULL; ZZ324UuATX  
 } gZ>) S@  
 return unhooked; oe*CZ  
} P[%nD cB  
#GuN.`__n,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -R-yr.$j*  
{ \~> .NH-  
 BOOL bAdded=FALSE; Y=ksrs>w  
 for(int index=0;index<MAX_KEY;index++){ 80%L!x|  
  if(hCallWnd[index]==0){ e X{#F gFc  
   hCallWnd[index]=hWnd; 2_Gb K-  
   HotKey[index]=cKey; WNSY@q  
   HotKeyMask[index]=cMask; 0^83:C ^{  
   bAdded=TRUE; \h@3dJ4  
   KeyCount++; awl3|k/  
   break; }0}=-g&  
  } b!JrdJO,DP  
 } 'Bwv-J  
 return bAdded; x K ;#C  
} 3_ ZlZ_Tq  
[tk6Kx8a  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M.9w_bW]#D  
{ WRp0.  
 BOOL bRemoved=FALSE; dUH+7.\  
 for(int index=0;index<MAX_KEY;index++){ Yy'CBIq#f  
  if(hCallWnd[index]==hWnd){ l.xKv$uOGR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ kfgkZ"9  
    hCallWnd[index]=NULL; [=TD)o>W(p  
    HotKey[index]=0; )l H`a  
    HotKeyMask[index]=0; 7d^ ~.F  
    bRemoved=TRUE; _>E=.$  
    KeyCount--; @y2cC6+'t  
    break; oc"7|YG  
   } \DcO .`L  
  } J,*+Ak ~  
 } X@ S~D7|ja  
 return bRemoved; q.bx nta"  
} $kBcnk  
3}lIY7 O  
void VerifyWindow() V-9\@'gc  
{ .Vrl:  
 for(int i=0;i<MAX_KEY;i++){ OCELG~  
  if(hCallWnd!=NULL){ >BZ,g!N,J}  
   if(!IsWindow(hCallWnd)){ /s@j{*Om  
    hCallWnd=NULL; s+E: 7T9P  
    HotKey=0; bT MgE Y  
    HotKeyMask=0; 5KTPlqm0qF  
    KeyCount--; 6[,7g&C  
   } @77+K:9I 7  
  } eig{~3  
 } g?N^9B,$2  
} t=fr`|!  
w!jY(WK U  
BOOL CHookApp::InitInstance() "hnvND4=  
{ 7/K L<T9@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); X0knM}5  
 hins=AfxGetInstanceHandle(); LKBh{X0%(  
 InitHotkey(); /vI"v 4  
 return CWinApp::InitInstance(); k8b5~A,  
} 0ev='v8?  
av bup  
int CHookApp::ExitInstance() u6Yp ,!+  
{ TN/y4(j  
 VerifyWindow(); pM9M8d  
 UnInit(); ]app9  
 return CWinApp::ExitInstance(); #nq_R  
} _UV_n!R  
O1 !YHo  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file mD%IHzbn H  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) [Z^26/5a  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7Vu f4Z5  
#if _MSC_VER > 1000 ~ga WZQXyu  
#pragma once iB5q"hoZC  
#endif // _MSC_VER > 1000 KQ^|prN?y  
QjKh#sU&  
class CCaptureDlg : public CDialog Dq-[b+bm  
{ Za]~[F  
 // Construction =7[}:haB{  
 public: UrO& K]Z  
  BOOL bTray; S`Z[MNY  
  BOOL bRegistered; NA$%Up  
  BOOL RegisterHotkey(); ipE|)Ns  
  UCHAR cKey; PZVH=dagq  
  UCHAR cMask; p6&<eMwFA  
  void DeleteIcon(); @1D3E=  
  void AddIcon(); @Z5,j)  
  UINT nCount; j`#H%2W\;  
  void SaveBmp(); %Fx ^"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor yqH9*&KH{  
  // Dialog Data Y;@]G=a   
  //{{AFX_DATA(CCaptureDlg) "wCx]{Di  
  enum { IDD = IDD_CAPTURE_DIALOG }; *'*n}fM  
  CComboBox m_Key; ~14|y|\/  
  BOOL m_bControl; <"8F=3:uk  
  BOOL m_bAlt; B|.A6:1g+  
  BOOL m_bShift; 1je/l9L  
  CString m_Path; cl`7|;v|?  
  CString m_Number; y t7>,  
  //}}AFX_DATA { <1uV']x  
  // ClassWizard generated virtual function overrides 4 !m'9  
  //{{AFX_VIRTUAL(CCaptureDlg) 4I9Yr  
 public: 2Bi?^kQ#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ;p7R~17  
 protected: u@tH6k*cBz  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -hq^';,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7yjun|Lt}X  
  //}}AFX_VIRTUAL I>q!co9n  
  // Implementation H^dw=kS  
 protected:  tN.$4+  
  HICON m_hIcon; hiv {A9a?  
  // Generated message map functions _2{2Xb  
  //{{AFX_MSG(CCaptureDlg) \Rs9B .  
  virtual BOOL OnInitDialog(); SYh>FF"  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {-Gh 62hDg  
  afx_msg void OnPaint(); &DjA?0`J  
  afx_msg HCURSOR OnQueryDragIcon(); bk&kZI.D  
  virtual void OnCancel(); #=)!\   
  afx_msg void OnAbout(); lI~8[[$xd  
  afx_msg void OnBrowse(); V5p^]To!  
  afx_msg void OnChange(); K{,'%|  
 //}}AFX_MSG Vl3-cW@p  
 DECLARE_MESSAGE_MAP() z]KJ4  
}; X"9N<)C  
#endif ~dzD7lG6  
]~~G<Yh:=  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file g W_E  
#include "stdafx.h" t/_\w"  
#include "Capture.h" =[zP  
#include "CaptureDlg.h" ^nK7&]rK  
#include <windowsx.h> DWEDL[{  
#pragma comment(lib,"hook.lib") e1y#p3 @d  
#ifdef _DEBUG 7w]3D  
#define new DEBUG_NEW N|%r5%  
#undef THIS_FILE =k,?+h~  
static char THIS_FILE[] = __FILE__; X,Rl&K\b"  
#endif ,N;2"$+E  
#define IDM_SHELL WM_USER+1 dkY JO!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j5og}P q:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JH u>\{8V  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _s<s14+od  
class CAboutDlg : public CDialog a4 7e  
{ n 83Dt*O  
 public: f96`n+>x i  
  CAboutDlg(); i8p$wf"aW  
  // Dialog Data m#R"~ >  
  //{{AFX_DATA(CAboutDlg) Qv g_|~n  
  enum { IDD = IDD_ABOUTBOX }; |ICn/r~  
  //}}AFX_DATA sSc~q+xz  
  // ClassWizard generated virtual function overrides `%^w-'  
  //{{AFX_VIRTUAL(CAboutDlg) :I2,  
 protected: A,xPA  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5%4yUd#b  
  //}}AFX_VIRTUAL ,CN (;z)  
  // Implementation m`):= ^nC  
 protected: .5AFAGv_c  
  //{{AFX_MSG(CAboutDlg) d`C$vj  
  //}}AFX_MSG NFP h}D  
  DECLARE_MESSAGE_MAP() {p$@)b  
}; m 9\"B3sr  
sCP|d`'  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) c##tP*(  
{ ,0ilNi>  
 //{{AFX_DATA_INIT(CAboutDlg) kr@!j@j$  
 //}}AFX_DATA_INIT ! 2knS S  
} FFcIOn  
+'+ Nr<  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XR 3 dG:  
{ >I<}:=   
 CDialog::DoDataExchange(pDX); I3b*sx$  
 //{{AFX_DATA_MAP(CAboutDlg) uMpuS1  
 //}}AFX_DATA_MAP .'$8Hj;@  
} '9zKaL  
7&/1K%x9;  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }s:3_9mE  
 //{{AFX_MSG_MAP(CAboutDlg) *4LRdLMn  
 // No message handlers O*bzp-6\  
 //}}AFX_MSG_MAP 5`$!s17  
END_MESSAGE_MAP() RZKx!X4=q  
s$,G5Feub  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) PIXqd,  
: CDialog(CCaptureDlg::IDD, pParent) "FhC"}N  
{ k}I65 ^l#  
 //{{AFX_DATA_INIT(CCaptureDlg) nP<u.{q L  
  m_bControl = FALSE; <L11s%5-  
  m_bAlt = FALSE; /hmDeP o}  
  m_bShift = FALSE; }Y|M+0   
  m_Path = _T("c:\\"); sa _J6~  
  m_Number = _T("0 picture captured."); PkZ1Db  
  nCount=0; AAW] Y#UwW  
  bRegistered=FALSE; lrwQ >N  
  bTray=FALSE; ]~VuY:abH  
 //}}AFX_DATA_INIT -QR]BD%J*[  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Qx3eEt@X5]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `IJ)'$pn  
} /OB)\{-  
)db:jPkwd  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) V~ MsGj  
{ )f8;ze  
 CDialog::DoDataExchange(pDX); &j ; 91wEn  
 //{{AFX_DATA_MAP(CCaptureDlg) 7E#h(bt j  
  DDX_Control(pDX, IDC_KEY, m_Key); ^i2>Ax&T  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); EVBOubV  
  DDX_Check(pDX, IDC_ALT, m_bAlt); F|y0q:U  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 'Z=_zG/RX  
  DDX_Text(pDX, IDC_PATH, m_Path); vM]5IHqeE  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 0%%y9;o  
 //}}AFX_DATA_MAP E.sZjo1  
} -q[x"Ha%  
mxBx?xM-  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) WNb2"W  
//{{AFX_MSG_MAP(CCaptureDlg) akPd#mf  
 ON_WM_SYSCOMMAND() Iw`|,-|  
 ON_WM_PAINT() jcvq:i{  
 ON_WM_QUERYDRAGICON() _?y3&4N)  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) |Kjfh};-C  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 8B-mZFXpK  
 ON_BN_CLICKED(ID_CHANGE, OnChange) n7Bv~?DM  
//}}AFX_MSG_MAP mF!4*k  
END_MESSAGE_MAP() %Tu(>vnuj  
Y~Vc|zM^(  
BOOL CCaptureDlg::OnInitDialog() |pbetA4&  
{ _(~LXk^C  
 CDialog::OnInitDialog(); Y2tBFeWY  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?u;m ],w!  
 ASSERT(IDM_ABOUTBOX < 0xF000); #@5VT* /7  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .fhfb\$  
 if (pSysMenu != NULL) <gGO  
 { b<#zgf  
  CString strAboutMenu; SK&1l`3  
  strAboutMenu.LoadString(IDS_ABOUTBOX); F(Zf=$cx  
  if (!strAboutMenu.IsEmpty()) iPY)Ew`Im  
  { ~% t'}JDZ  
   pSysMenu->AppendMenu(MF_SEPARATOR); "#gS?aS  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Z__fwv.X[  
  } | oM`  
 } *93=}1gN  
 SetIcon(m_hIcon, TRUE); // Set big icon ^'du@XCf}  
 SetIcon(m_hIcon, FALSE); // Set small icon w8j pOvj  
 m_Key.SetCurSel(0); <HTz  
 RegisterHotkey(); pDJN}XtjT  
 CMenu* pMenu=GetSystemMenu(FALSE); -{J0~1'#-  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?~T(Cue>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /*BK6hc  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %Ie,J5g5  
 return TRUE; // return TRUE unless you set the focus to a control ]q4LN o  
} ZREy I(_  
KF@%tR}V{  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) q4Bw5 ~n  
{ *?C8,;=2r  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4M|C>My  
 { {06ClI  
  CAboutDlg dlgAbout; !};Ll=dz  
  dlgAbout.DoModal(); hR:i!  
 } _A& [rBm|  
 else OC-d5P  
 { wu11)HFL|z  
  CDialog::OnSysCommand(nID, lParam); WBJn1  
 } .HGK  3  
}  t5S|0/f  
J}4RJ9  
void CCaptureDlg::OnPaint() &'i>d&  
{ p\#;(pf}s  
 if (IsIconic()) 'rFLG+W  
 { [+CFQf>  
  CPaintDC dc(this); // device context for painting /X0<2&v  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); l x0BKD?n  
  // Center icon in client rectangle <^Y #q  
  int cxIcon = GetSystemMetrics(SM_CXICON); tn _\E/Q  
  int cyIcon = GetSystemMetrics(SM_CYICON); `s\[X-j]  
  CRect rect; }?Pa(0=U  
  GetClientRect(&rect); |0>rojMq  
  int x = (rect.Width() - cxIcon + 1) / 2;  P s|[  
  int y = (rect.Height() - cyIcon + 1) / 2; /NR*<,c%  
  // Draw the icon QhAYCw2  
  dc.DrawIcon(x, y, m_hIcon); oa5L5Zr,A  
 } j jv'"K2  
 else +XX5;;IC  
 { BILZ XMf  
  CDialog::OnPaint(); Mh3L(z]/E  
 } |HJ`uGN<b  
} ) k[XO  
`WxGU  
HCURSOR CCaptureDlg::OnQueryDragIcon() ,1!Y!,xy  
{ W np[8IEU  
 return (HCURSOR) m_hIcon; X|g5tnsj`  
} qC& xuu|  
hBcklI  
void CCaptureDlg::OnCancel() E5|GP  
{ t1oTZ  
 if(bTray) FEopNDy@y  
  DeleteIcon(); NU{eoqaT  
  CDialog::OnCancel(); qPUACuF'  
} : 4lR`%  
3BLH d<  
void CCaptureDlg::OnAbout() t4~?m{  
{ 2v4&'C  
 CAboutDlg dlg; B VH)!]m0  
 dlg.DoModal(); ?v F8 y;Jh  
} 1GLb^:~A  
kDE:KV<"c  
void CCaptureDlg::OnBrowse() )[&j&AI  
{ Dk")/ ib  
 CString str; 2JeEmG9  
 BROWSEINFO bi; [!} uj`e  
 char name[MAX_PATH]; B%))HLo'  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); (U.VCSn  
 bi.hwndOwner=GetSafeHwnd(); fHI@' '0  
 bi.pszDisplayName=name; 673G6Nk  
 bi.lpszTitle="Select folder"; :'fK`G 6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; {+kWK;1  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); L+lye Ir'  
 if(idl==NULL) AGVipI #  
  return; aK,\e/Oo  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); xs "\c7pC  
 str.ReleaseBuffer(); $SniQ  
 m_Path=str; @}+B%R  
 if(str.GetAt(str.GetLength()-1)!='\\') -wNhbV2  
  m_Path+="\\";  Spo[JQ%6  
 UpdateData(FALSE); CJ#Yu3}  
} #0#6eT{-  
la]Zk  
void CCaptureDlg::SaveBmp() G"vEtNoV  
{ (15.?9  
 CDC dc; NB(  GE  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); '$ G%HUn  
 CBitmap bm; 9N) Ea:N  
 int Width=GetSystemMetrics(SM_CXSCREEN); V|nJ%G\  
 int Height=GetSystemMetrics(SM_CYSCREEN); xFp9H'j{  
 bm.CreateCompatibleBitmap(&dc,Width,Height); " 68=dC  
 CDC tdc; A/j'{X!z  
 tdc.CreateCompatibleDC(&dc); ,p..h+l  
 CBitmap*pOld=tdc.SelectObject(&bm); XFww|SG$  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $uK[[k~=S  
 tdc.SelectObject(pOld); E`iE]O  
 BITMAP btm; lx82:_  
 bm.GetBitmap(&btm); y] $- :^  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ,qdZ6bv,]|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); H a`V"X{}  
 BITMAPINFOHEADER bih; Z$)jPDSr  
 bih.biBitCount=btm.bmBitsPixel; B|;?#okx  
 bih.biClrImportant=0; 9!D c=  
 bih.biClrUsed=0; :{Iv ]d  
 bih.biCompression=0; 'w\Gd7E  
 bih.biHeight=btm.bmHeight; k.H4Mf(4  
 bih.biPlanes=1; {UhpN"'"n  
 bih.biSize=sizeof(BITMAPINFOHEADER); %8|?YxiZ:  
 bih.biSizeImage=size; Az(J @  
 bih.biWidth=btm.bmWidth; /"1[qT\F  
 bih.biXPelsPerMeter=0; OnE~0+  
 bih.biYPelsPerMeter=0; |X~vsM0  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2QIo|$  
 static int filecount=0; 3 +D4$Y"  
 CString name; |q_Hiap#a  
 name.Format("pict%04d.bmp",filecount++); GsE =5A8  
 name=m_Path+name; $[(FCS  
 BITMAPFILEHEADER bfh; ;, u7)  
 bfh.bfReserved1=bfh.bfReserved2=0; %Vsg4DRy  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ?T[K{t;~jo  
 bfh.bfSize=54+size; L i`OaP$  
 bfh.bfOffBits=54; F;Ubdxwwl  
 CFile bf; `{S4_'  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _#o75*42tT  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); r9^~I  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); TIP H#W:v  
  bf.WriteHuge(lpData,size); jouT9~[L'  
  bf.Close(); Vvl8P|x.<  
  nCount++; byj7c(  
 } YzAGhAyw  
 GlobalFreePtr(lpData); };8PPR)\y  
 if(nCount==1) L0xh?B  
  m_Number.Format("%d picture captured.",nCount); X.ZY1vO  
 else Z3A"GWY  
  m_Number.Format("%d pictures captured.",nCount); -/6Ms%O  
  UpdateData(FALSE); )7N$lY<  
} B]cV|S|  
]-u>HO g\  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]i'gU(+;`  
{ I%ZSh]On  
 if(pMsg -> message == WM_KEYDOWN) "eKM<S  
 { BH?fFe&J:`  
  if(pMsg -> wParam == VK_ESCAPE) K%>3ev=y.s  
   return TRUE; 1f5;^T I  
  if(pMsg -> wParam == VK_RETURN) th|TwD&mO  
   return TRUE; ebB8.(k9G3  
 } YR68'Sft[  
 return CDialog::PreTranslateMessage(pMsg); GG`;c?d@  
} =xHzhh  
jR,3 -JQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dv \aP  
{ 'ewVn1ME[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |f"1I4K g  
  SaveBmp(); VK$s+"  
  return FALSE; n0'"/zyc  
} 0]t7(P"F6  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dIvvJk8  
 CMenu pop; 3=kw{r[2lM  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ? `#  
 CMenu*pMenu=pop.GetSubMenu(0); WLN;LT  
 pMenu->SetDefaultItem(ID_EXITICON); zB)wY KwZ  
 CPoint pt; )'t&LWS~  
 GetCursorPos(&pt); NiH.Pv)Oa'  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); #N|A@B5 x  
 if(id==ID_EXITICON) I-|1eR+3  
  DeleteIcon(); C]%}L%,  
 else if(id==ID_EXIT) o_%gFV[q  
  OnCancel(); 'tzN.p1O  
 return FALSE; Q!}LtR$  
} hk+"c^g:j<  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); si>gYO  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ndB*^nT  
 AddIcon(); >U'gQS?\]  
 return res; ~px)Jd  
} e!O:z   
n%:&N   
void CCaptureDlg::AddIcon() ;"D I)hd z  
{ &<S]=\  
 NOTIFYICONDATA data; hvU\l`m  
 data.cbSize=sizeof(NOTIFYICONDATA); {}v<2bS  
 CString tip; }VXZM7@u  
 tip.LoadString(IDS_ICONTIP); /7XVr"R  
 data.hIcon=GetIcon(0); u1i ?L'  
 data.hWnd=GetSafeHwnd(); ++M%PF [ {  
 strcpy(data.szTip,tip); }h`ddo  
 data.uCallbackMessage=IDM_SHELL; bjGQ04da  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1 gx(L*y,  
 data.uID=98; {'eF;!!Dy  
 Shell_NotifyIcon(NIM_ADD,&data); ]5i]2r1  
 ShowWindow(SW_HIDE); m^ [VM&%  
 bTray=TRUE; S?LUSb  
} iQ_^MzA  
} {m.\O  
void CCaptureDlg::DeleteIcon() RiM!LX  
{ Z?tw#n[T  
 NOTIFYICONDATA data; F6 c1YI[  
 data.cbSize=sizeof(NOTIFYICONDATA);  8&KqrA86  
 data.hWnd=GetSafeHwnd(); 8 n)3'ok  
 data.uID=98; SB2Ij',  
 Shell_NotifyIcon(NIM_DELETE,&data); e` D?x1-  
 ShowWindow(SW_SHOW); /2e,,)4g  
 SetForegroundWindow(); dW>$C_`?  
 ShowWindow(SW_SHOWNORMAL); *%`jcF  
 bTray=FALSE; Hs6}~d  
} B#;0{  
joJ:* oL  
void CCaptureDlg::OnChange() "?TKz:9r  
{ Wc- 8j2M  
 RegisterHotkey(); XP!7@:  
} 9\D0mjn=l  
YO^iEI.  
BOOL CCaptureDlg::RegisterHotkey() W0>fu>  
{ nvnJVkL9s  
 UpdateData(); /A~+32 B  
 UCHAR mask=0; LS4|$X4H`!  
 UCHAR key=0; _q dLA  
 if(m_bControl) 2 VGGSLr  
  mask|=4; JPfE`NZ  
 if(m_bAlt) TZ+2S93c  
  mask|=2; `h|>;u   
 if(m_bShift) 1$G'Kg/  
  mask|=1; X-=J7G`\h#  
  key=Key_Table[m_Key.GetCurSel()]; Ks-aJ+}  
 if(bRegistered){ v&*}O  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %R [X_n=  
  bRegistered=FALSE; 9,zM.g9Qv  
 } K+s xO/}h  
 cMask=mask; t.E3Fh!o  
 cKey=key; =)Q0=!%-  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Fq9>t/Zj  
 return bRegistered; ; 0`p"T0  
} @s@67\  
5.e. BT  
  四、小结 [e+$jsPl  
Pb-Ft =  
  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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