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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: ^3L0w}#  
  V[Ui/M!9Z  
  一、实现方法 ,1o FPa{?  
j+  0I-p  
  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: VS8Rx.?  
b}TS0+TF  
#pragma data_seg("shareddata") JrRH\+4K  
HHOOK hHook =NULL; //钩子句柄 j HJ`,#  
UINT nHookCount =0; //挂接的程序数目 u5f9Jw}  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 j\^CV?}sm'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Y glmX"fLf  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey y/ ef>ZZ  
static int KeyCount =0; Gu\q%'I  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @QPz #-  
#pragma data_seg() M:B=\&.O  
338k?nHxv  
  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。 U#WF ;q0L  
p4 ^yVa  
  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: n]o<S+z  
%aVq+kC h  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR q6V>zi  
cKey,UCHAR cMask) QX'qyojxN  
{ vuY~_  
 BOOL bAdded=FALSE; 5uj?#)N  
 for(int index=0;index<MAX_KEY;index++){ );&:9[b_  
  if(hCallWnd[index]==0){ H%Q7D-  
   hCallWnd[index]=hWnd; fHd#u%63K  
   HotKey[index]=cKey; 8>i n_h9  
   HotKeyMask[index]=cMask; V{3x!+q  
   bAdded=TRUE; -fW*vE:  
   KeyCount++; N~zdWnSZ@G  
   break; #fn)k1  
  } aE$[5 2  
 } K/yxE|w<  
 return bAdded; Uf;^%*P4  
} )cMh0SGcM1  
//删除热键 jLHkOk5{:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Sk\K4  
{ 68C%B9.b'  
 BOOL bRemoved=FALSE; |"CZT#  
 for(int index=0;index<MAX_KEY;index++){ 5(Q%XQV*P  
  if(hCallWnd[index]==hWnd){ y,,dCca  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PmEsN&YP]  
    hCallWnd[index]=NULL; 4yA+ h2  
    HotKey[index]=0; 0rs"o-s<  
    HotKeyMask[index]=0; XrGglBIV  
    bRemoved=TRUE; V#gK$uv  
    KeyCount--; gu.}M:u  
    break; v\%HPMlh  
   } B !L{  
  } rlSeu5X6  
 }  < !C)x  
 return bRemoved; Pw`8Wj  
} a![{M<Y~  
lE(HFal0-(  
/dI&o,sA  
  DLL中的钩子函数如下: (m(JK^  
T;a}#56{^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~H<6gN<j(.  
{ yg=q;Z>[~  
 BOOL bProcessed=FALSE; ~[nSXnPO  
 if(HC_ACTION==nCode) a P@N)"  
 { #rQ2gx4  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 2E)-M9ds  
   switch(wParam) q01wbO3-"  
   {  T<Z &kYU:R  
    case VK_MENU: fW1CFRHH  
     MaskBits&=~ALTBIT; ! Y~FLA_  
     break; ~1AgD-:Jz  
    case VK_CONTROL: `MN4uC  
     MaskBits&=~CTRLBIT; ,77d(bR<  
     break; _FU_Ubkr  
    case VK_SHIFT: $AjHbU.I{  
     MaskBits&=~SHIFTBIT; o&)8o5  
     break; ?(F6#"/E  
    default: //judge the key and send message <7Or{:Sc90  
     break; goOCu  
   } dhf!o0'1M  
   for(int index=0;index<MAX_KEY;index++){ u5b|#&-mX  
    if(hCallWnd[index]==NULL) Y>dzR)~3[  
     continue; W ]?G}Q;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S3*`jF>q  
    { pG^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vm7z,FfN  
     bProcessed=TRUE; @&3EJ1  
    } lc1(t:"[  
   } qUW! G&R  
  } .*S#aq4S  
  else if((lParam&0xc000ffff)==1){ //有键按下 b;W3j   
   switch(wParam) &4x}ppX  
   { 0#s"e}@v  
    case VK_MENU: 'ud{m[|  
     MaskBits|=ALTBIT; x$.^"l-vX  
     break; L;NvcUFn  
    case VK_CONTROL: yT"Eq"7/Y#  
     MaskBits|=CTRLBIT; o!Ieb  
     break; ;yLu R  
    case VK_SHIFT: g._]8{K  
     MaskBits|=SHIFTBIT; v,{ :Ez(H  
     break; :vqgGKml$  
    default: //judge the key and send message bL+_j}{:N  
     break; f<fXsSv(  
   } }1c|gQ  
   for(int index=0;index<MAX_KEY;index++){ PI:4m%[  
    if(hCallWnd[index]==NULL) 17[3/m8a  
     continue; p6]1w]*R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RYQR(v  
    { t?-n*9,#S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); BB!THj69a6  
     bProcessed=TRUE; b"uu  
    } P%:wAYz1^O  
   } ~"&|W'he[  
  } (ybI\UI  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 WwBOM~/`2  
   for(int index=0;index<MAX_KEY;index++){ ;!mzyb*  
    if(hCallWnd[index]==NULL) L:pYn_  
     continue; qYjce]c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) L~rBAIdD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vrhT<+q  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 JPc+rfF  
   } 8:c-k|CX  
  } ]}-7_n#cC  
 } rq/yD,I,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r6MMCJ|G  
} +ocol6G7W  
fF$<7O)+]  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: L_uVL#To  
NMa}{*sQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :uq\+(9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,]ma+(|  
tqvN0vY5  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: a}BYov  
6ryak!|[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ic"ybj`  
{ QT< }] 0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 1R{!]uh  
 { ,.83m%i  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ['X]R:3h  
  SaveBmp(); "3)C'WlEy/  
  return FALSE; hl7bzKO*w  
 } @uqd.Q  
 …… //其它处理及默认处理 ?wiC Q6*$  
} (cAIvgI  
h5{'Q$Erl  
1MP~dRZ$  
  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。 xd q?/^E  
av}k)ZT_  
  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。 0_95|3kc  
=)H.c uc  
  二、编程步骤 w(*vj  
+qtJaYf/0  
  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"; c)TPM/>(p  
dUeN*Nq&(,  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; )BZ.Sv  
R[h9"0Y^  
  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; g|DF[  
N=T<_`$5  
  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; U3ADsdn  
t9kzw*U9  
  5、 添加代码,编译运行程序。 $k@O`xD,q  
b,l$1{  
三、程序代码 25nt14Y 0u  
<y2U3; t  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (^8Y|:Tz  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) o]J{{M'E  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ k2omJ$?v  
#if _MSC_VER > 1000 ITE{@1  
#pragma once Xk~D$~4<  
#endif // _MSC_VER > 1000 ~9,,~db  
#ifndef __AFXWIN_H__ #l\=}#\1Wb  
#error include 'stdafx.h' before including this file for PCH DbBcQ%  
#endif ~9a<0Mc?  
#include "resource.h" // main symbols I+%[d^,  
class CHookApp : public CWinApp iTBx\ u%{  
{  &=@IzmA  
 public: \+oQd=K@  
  CHookApp(); $B 2J T9  
  // Overrides sQ UM~HD\a  
  // ClassWizard generated virtual function overrides ="1Ind@w!  
  //{{AFX_VIRTUAL(CHookApp) GfxZ'VIn  
 public: >\-hO&%_  
  virtual BOOL InitInstance(); tzWSA-Li  
  virtual int ExitInstance(); .;y.]Z/;  
  //}}AFX_VIRTUAL Z, zWuE3  
  //{{AFX_MSG(CHookApp) p,5i)nEFj  
  // NOTE - the ClassWizard will add and remove member functions here. Go`vfm"S  
  // DO NOT EDIT what you see in these blocks of generated code ! e8>})  
  //}}AFX_MSG A2I9R;}  
  DECLARE_MESSAGE_MAP() 1E[J%Rh\ l  
}; ,uSMQS-O'4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); oA7tE u   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GvtG(u~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O40?{v'  
BOOL InitHotkey(); lK?uXr7^  
BOOL UnInit(); LiC*@W  
#endif pz!Zs."f)  
2RVN\?s:  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 7X`g,b!  
#include "stdafx.h" 0#7>o^2  
#include "hook.h" n*R])=F@c  
#include <windowsx.h> g+8OekzB5  
#ifdef _DEBUG /QK6Rac-  
#define new DEBUG_NEW "(3[+W{|  
#undef THIS_FILE Q,,e+exbb5  
static char THIS_FILE[] = __FILE__; I13y6= d  
#endif bQzZy5,  
#define MAX_KEY 100 j2t7'bO_  
#define CTRLBIT 0x04 e@L=LW>  
#define ALTBIT 0x02 @+&LYy72  
#define SHIFTBIT 0x01 x 77*c._3v  
#pragma data_seg("shareddata") DzAg"6=CS  
HHOOK hHook =NULL; yJ[0WY8<kC  
UINT nHookCount =0; QGMV}y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey <O(4TO  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |%BOZT  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey e[{0)y>=  
static int KeyCount =0; fF!Yp iI"  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift h/QXPdV  
#pragma data_seg() NJ%P/\ C  
HINSTANCE hins; +C^nO=[E  
void VerifyWindow(); _>o:R$ %}  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) l] K3Y\#bP  
//{{AFX_MSG_MAP(CHookApp) +r�  
// NOTE - the ClassWizard will add and remove mapping macros here. u4*BX&  
// DO NOT EDIT what you see in these blocks of generated code! U45e2~1!O  
//}}AFX_MSG_MAP $!-yr7  
END_MESSAGE_MAP() k90YV(  
iOf<$f  
CHookApp::CHookApp() $H2u.U<ip  
{ XnH05LQ  
 // TODO: add construction code here, 3p$?,0ELH  
 // Place all significant initialization in InitInstance i7CX65&b  
} u%GEqruo[  
m;$ b'pT  
CHookApp theApp; ,5P0S0*{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [CTnXb  
{ k`cfG\;r  
 BOOL bProcessed=FALSE; H-!,yte  
 if(HC_ACTION==nCode) 9sM!`Lz{  
 { 6lZ3tdyNo  
  if((lParam&0xc0000000)==0xc0000000){// Key up &Gc9VF]o  
   switch(wParam) h,(26 y/s  
   { CmWeY$Jb  
    case VK_MENU: j}#w )M  
     MaskBits&=~ALTBIT; [DYQ"A= )d  
     break; ]E{NNHK%2N  
    case VK_CONTROL: _kC-dEGf!y  
     MaskBits&=~CTRLBIT; SjK  
     break; !K#qeY}  
    case VK_SHIFT: a)!o @  
     MaskBits&=~SHIFTBIT; oe ~'o'  
     break; :ffY6L+  
    default: //judge the key and send message HRpte=`q  
     break; $o!zUH~'v  
   } Yz9owe8}[  
   for(int index=0;index<MAX_KEY;index++){ !@5 9)  
    if(hCallWnd[index]==NULL) x o;QCOH  
     continue; ; t)3F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b;L\EB  
    { ~kV/!=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H[T?\Lq  
     bProcessed=TRUE; d.aS{;pse  
    } \wmN  
   } 0RzEY!9g+  
  } XjBW9a  
  else if((lParam&0xc000ffff)==1){ //Key down ,S\CC{!  
   switch(wParam) S0$8@"~=  
   { y1z4ik)Sd@  
    case VK_MENU: ufj,T7g^  
     MaskBits|=ALTBIT; 1l9 G[o *  
     break; [=C6U_vU  
    case VK_CONTROL: v<k?Vu  
     MaskBits|=CTRLBIT; ;cNv\t  
     break; y-Fo=y  
    case VK_SHIFT: v6|RJt?  
     MaskBits|=SHIFTBIT; &.3"Uo\#  
     break; OU E (I3_  
    default: //judge the key and send message }ZYd4h|g\z  
     break; iG $!6;w<  
   } XMZ,Y7  
   for(int index=0;index<MAX_KEY;index++) {.`vs;U  
   { @?ebuj5{e  
    if(hCallWnd[index]==NULL) 2 'l'8  
     continue; pR<`H'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SV4E0c>  
    { p;a,#IJu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); v{RZJ^1  
     bProcessed=TRUE; aNsBcov3O  
    } W@>% {eE  
   } gE-tjoJ  
  } UJUEYG  
  if(!bProcessed){ EZgwF =lO  
   for(int index=0;index<MAX_KEY;index++){ \eTwXe]Pv  
    if(hCallWnd[index]==NULL) KA5v+~  
     continue; m5n #v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) qyb?49I  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); H;mSkRD3N  
   } %64 )(z  
  } `K"L /I9  
 } v4<nI;Ux  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \Dm";Ay>  
} @ 6\I~s(  
'B$yo]  
BOOL InitHotkey() SZ7:u895E  
{ J[&@PUy  
 if(hHook!=NULL){ 5"VTK  
  nHookCount++; 7jrt7[{  
  return TRUE; t mn tp  
 } ';k5?^T  
 else W<{h,j8  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |o"?gB}Dh  
  if(hHook!=NULL) sQ3 [<  
   nHookCount++; h#I>M`|  
  return (hHook!=NULL); $V;i '(&7  
} 4IK( 7  
BOOL UnInit() fy1|$d{'  
{ Mc lkEfn  
 if(nHookCount>1){ W_293["lS  
  nHookCount--; S)(.,x  
  return TRUE; Ng&%o  
 } - nm"of\o  
 BOOL unhooked = UnhookWindowsHookEx(hHook); F~ty!(c  
 if(unhooked==TRUE){ @ )F)S 7  
  nHookCount=0; eSn+B;  
  hHook=NULL; Vsr.=Nd=  
 } 1NFsb-<u  
 return unhooked; `?H]h"{7Q  
} _rMg}F"  
AF{\6<m  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &N9 a<w8+  
{ Yu/ID!`Z  
 BOOL bAdded=FALSE; krxo"WgD  
 for(int index=0;index<MAX_KEY;index++){ OG~gFZr)6  
  if(hCallWnd[index]==0){ u2 I*-K  
   hCallWnd[index]=hWnd; YpHg&|Fr  
   HotKey[index]=cKey; @)+AaC#-  
   HotKeyMask[index]=cMask; 1q\\5A<V  
   bAdded=TRUE; 7O2/z:$f  
   KeyCount++; 8LJ8 }%*  
   break; &, vcJ{.  
  } ,oe <  
 } u]wZQl#-  
 return bAdded; T  wB}l  
} nUr5Qn?  
8$cLG*=h4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) CZe ]kXNv  
{ )CYGQMK  
 BOOL bRemoved=FALSE; w_c"@CjkE  
 for(int index=0;index<MAX_KEY;index++){ X56q-|  
  if(hCallWnd[index]==hWnd){ wo}H'Q}Hj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }v;V=%N+v  
    hCallWnd[index]=NULL; '6`3(TK.a  
    HotKey[index]=0; yf)%%&  
    HotKeyMask[index]=0; UXz<)RvB  
    bRemoved=TRUE; Mexk~z A^  
    KeyCount--; ;a!S!% .h  
    break; P{`C^W$J^  
   } M7\szv\Zc=  
  } fm%t^)E  
 } A|[?#S((]  
 return bRemoved; @u+]aI!`-  
} eeg)N1\  
4KAZ ':  
void VerifyWindow() 2szPAuN+  
{ lBE= (A`  
 for(int i=0;i<MAX_KEY;i++){  7Die FZ?  
  if(hCallWnd!=NULL){ eIF5ZPSZi  
   if(!IsWindow(hCallWnd)){ ?,Xw[pR  
    hCallWnd=NULL; ;O5zUl-`  
    HotKey=0; y1D L,%j  
    HotKeyMask=0; B IEO,W|  
    KeyCount--; +480 l}  
   } ,pfG  
  } %Xg4b6<9  
 } R{4^t97wH{  
} #Pau\|e_  
uc{Ihw  
BOOL CHookApp::InitInstance() g/_5unI}u  
{ ~At7 +F[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); XW H5d-  
 hins=AfxGetInstanceHandle(); QZwNw;$k*  
 InitHotkey(); hag$GX'2k  
 return CWinApp::InitInstance(); c ]-<vkpV  
} Gu,wF(x7A  
o[4}h:> dq  
int CHookApp::ExitInstance() l4YbKnp]  
{ c]<5zyl"j1  
 VerifyWindow(); 0o4XUW   
 UnInit(); k'Hs}zeNn  
 return CWinApp::ExitInstance(); &B;~  
} M?49TOQA  
*R,5h2;  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `hm-.@f,9  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?<,l3pwqa  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ A2FYBM`Q&D  
#if _MSC_VER > 1000 qwcD`HV,  
#pragma once \K{ z  
#endif // _MSC_VER > 1000 iMh#TUlQEQ  
tjS@meT  
class CCaptureDlg : public CDialog GA )`-*.R  
{ zk+9'r`-D  
 // Construction P;no?  
 public: 2;b\9R^>A  
  BOOL bTray; 1~FOgk1;  
  BOOL bRegistered; rHI{aO7  
  BOOL RegisterHotkey(); dQX6(J j  
  UCHAR cKey; QL/(72K  
  UCHAR cMask; jd"@t*ZV  
  void DeleteIcon(); 4@gG<QJW  
  void AddIcon(); U>SShpmZA  
  UINT nCount; T Z@]:e:"b  
  void SaveBmp(); Pm?KI<TH~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (E 3b\lST  
  // Dialog Data `[yKFa I  
  //{{AFX_DATA(CCaptureDlg) #z%fx   
  enum { IDD = IDD_CAPTURE_DIALOG }; est9M*Fn  
  CComboBox m_Key; Kw^7>\  
  BOOL m_bControl; aO[w/cGQ  
  BOOL m_bAlt; >6-`}G+|  
  BOOL m_bShift; Uc>lGo1j  
  CString m_Path; Z\rwO>3  
  CString m_Number; 4"ZP 'I;  
  //}}AFX_DATA LOYk9m  
  // ClassWizard generated virtual function overrides G!##X: 6'  
  //{{AFX_VIRTUAL(CCaptureDlg) gJ+'W1$/  
 public: V Q@   
  virtual BOOL PreTranslateMessage(MSG* pMsg); e%M;?0j  
 protected: =XQ%t @z0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {S \{Ii6  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?z+eWL  
  //}}AFX_VIRTUAL {YC@T(  
  // Implementation ]/6z; ~3U  
 protected: Ix}sK"}[n  
  HICON m_hIcon; e`s ~.ZF  
  // Generated message map functions >R_&Ouh:  
  //{{AFX_MSG(CCaptureDlg) G_JA-@i%  
  virtual BOOL OnInitDialog(); 372rbY  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); u#~RkY7s  
  afx_msg void OnPaint(); ; 2#y7!  
  afx_msg HCURSOR OnQueryDragIcon(); Jpq~  
  virtual void OnCancel(); t?gic9 q  
  afx_msg void OnAbout(); T!{w~'=F  
  afx_msg void OnBrowse(); NxY#NaE:?4  
  afx_msg void OnChange(); ^76]0`gS  
 //}}AFX_MSG re<{ >  
 DECLARE_MESSAGE_MAP() t@;p  
}; |Ez>J+uye(  
#endif B[Scr5|  
P+sW[:  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 3?yg\  
#include "stdafx.h" (C L%>5V  
#include "Capture.h" l'qg8  
#include "CaptureDlg.h" D_7,m%Z:  
#include <windowsx.h> T-L||yE,h  
#pragma comment(lib,"hook.lib") vr l-$ii  
#ifdef _DEBUG u=sp`%?  
#define new DEBUG_NEW l)\! .X  
#undef THIS_FILE Fm 2AEs\  
static char THIS_FILE[] = __FILE__; +sA2WK]  
#endif |df Pki{  
#define IDM_SHELL WM_USER+1 5qm`J,~k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3hH<T.@)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b%`1cV  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 6 "sSoj  
class CAboutDlg : public CDialog N+xP26D8  
{ WH}y"W  
 public: {P./==^0  
  CAboutDlg(); aXYY:;  
  // Dialog Data 6 gE7e|+  
  //{{AFX_DATA(CAboutDlg) Vb_4f"  
  enum { IDD = IDD_ABOUTBOX }; ,4$>,@WW~  
  //}}AFX_DATA 0OE:[pR  
  // ClassWizard generated virtual function overrides x9g#<2w8  
  //{{AFX_VIRTUAL(CAboutDlg) X_h}J=33Q  
 protected: cT,sh~-x,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bE..P&"  
  //}}AFX_VIRTUAL Fxz"DZY6  
  // Implementation xp{tw$  
 protected: [q -h|m  
  //{{AFX_MSG(CAboutDlg) eym4=k ~  
  //}}AFX_MSG " 8MF_Gu):  
  DECLARE_MESSAGE_MAP() 7$=In K  
}; KpGhQdR#  
"+s++@ z  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =,8]nwgo  
{ HV|,}Wks6s  
 //{{AFX_DATA_INIT(CAboutDlg) r19 pZAc  
 //}}AFX_DATA_INIT Otuf] B^s  
} S\=Nn7"  
)t#W{Gzfmh  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) TJRCH>E[a  
{ ^h6tr8yn  
 CDialog::DoDataExchange(pDX); R 9\*#c  
 //{{AFX_DATA_MAP(CAboutDlg) Yq KCeg  
 //}}AFX_DATA_MAP %u'u kcL7  
} uXvtfc  
0,")C5j  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ZE}}W _  
 //{{AFX_MSG_MAP(CAboutDlg) p5iuYHKk?  
 // No message handlers &QgR*,5eo  
 //}}AFX_MSG_MAP R m( "=(  
END_MESSAGE_MAP() }7Q%6&IR  
5b*C1HS@X  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8ib:FF(= u  
: CDialog(CCaptureDlg::IDD, pParent) a~w$#fo"`f  
{ L8B! u9%  
 //{{AFX_DATA_INIT(CCaptureDlg) 0l6.<-f{  
  m_bControl = FALSE; (<9u-HF#  
  m_bAlt = FALSE; ]=BB#  
  m_bShift = FALSE; [W&T(%(W-  
  m_Path = _T("c:\\"); S9.o/mr  
  m_Number = _T("0 picture captured."); ?@86P|19  
  nCount=0; ;Y, y4{H3  
  bRegistered=FALSE; ~DwpoeYX  
  bTray=FALSE; XL ^GZ  
 //}}AFX_DATA_INIT <5051U Eu  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 2+XA X:YD  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); })%{AfDRF  
} h_'*XWd@  
AwR =]W;j  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5H^ (2w  
{ o]V^};B  
 CDialog::DoDataExchange(pDX); F^:3?JA _  
 //{{AFX_DATA_MAP(CCaptureDlg) 75lA%| *X  
  DDX_Control(pDX, IDC_KEY, m_Key); N!}f}oF  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); g_bLl)g<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ]-# DB^EQ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); uY To 9A  
  DDX_Text(pDX, IDC_PATH, m_Path); z$sT !QL~  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9 68Ez  
 //}}AFX_DATA_MAP Pq$n5fZC !  
} 1% `Rs  
e0 ecD3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5 qA'  
//{{AFX_MSG_MAP(CCaptureDlg) |G<|F`Cj  
 ON_WM_SYSCOMMAND() ccxNbU  
 ON_WM_PAINT() 0y\Z9+G:  
 ON_WM_QUERYDRAGICON() i%?*@uj  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) YmG("z  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $`8wJf9@w  
 ON_BN_CLICKED(ID_CHANGE, OnChange) {qVZNXDn  
//}}AFX_MSG_MAP LS[]=Mk@1  
END_MESSAGE_MAP() h(DTa  
QT}tvm@PMq  
BOOL CCaptureDlg::OnInitDialog() <P<z N~i9j  
{ .%-8 t{dt  
 CDialog::OnInitDialog(); Hl=xW/%6y  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); .xkM.g4{~  
 ASSERT(IDM_ABOUTBOX < 0xF000); i|kRK7[6B  
 CMenu* pSysMenu = GetSystemMenu(FALSE); dE3) | %  
 if (pSysMenu != NULL) | -H& o]  
 { Id9TG/H7  
  CString strAboutMenu; er\|i. Y  
  strAboutMenu.LoadString(IDS_ABOUTBOX); L~3Pm%{@A  
  if (!strAboutMenu.IsEmpty()) 0jfuBj5!  
  { 4+tEFxvX&  
   pSysMenu->AppendMenu(MF_SEPARATOR); ['D]>Ot68  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); U<XG{<2  
  } "dlV k~  
 } x{n=;JD  
 SetIcon(m_hIcon, TRUE); // Set big icon 7_t'( /yu  
 SetIcon(m_hIcon, FALSE); // Set small icon zQ PQ  
 m_Key.SetCurSel(0); fP1! )po  
 RegisterHotkey(); e3\T)x &=  
 CMenu* pMenu=GetSystemMenu(FALSE); !,PWb3S  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); j>kqz>3  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `]aeI'[}R  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); rm_Nn8p,  
 return TRUE; // return TRUE unless you set the focus to a control @4#vm@Yf_  
} 7zc^!LrW<  
^.y\(=  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) iy"*5<;*DD  
{ ?JUeuNs9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) O6Y0XL  
 { j<$2hiI/?&  
  CAboutDlg dlgAbout; l,).p  
  dlgAbout.DoModal(); G~m<;  
 } 2<3K3uz  
 else !R$`+wZ62  
 { \)e'`29;  
  CDialog::OnSysCommand(nID, lParam); 6LhTBV  
 } wIgS3K  
} Bw.i}3UT6  
4p wH>1  
void CCaptureDlg::OnPaint() 73-p*o(pt  
{ q(w(Sd)#L  
 if (IsIconic()) X>^fEQq"  
 { "N#Y gSr  
  CPaintDC dc(this); // device context for painting ^zr`;cJ+c  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); i30!}}N8  
  // Center icon in client rectangle pCG}Z Ka  
  int cxIcon = GetSystemMetrics(SM_CXICON); fqd^9wl>P6  
  int cyIcon = GetSystemMetrics(SM_CYICON); D_MmW  
  CRect rect; lq uLT6]  
  GetClientRect(&rect); VU#7%ufu&  
  int x = (rect.Width() - cxIcon + 1) / 2; PY'2h4IL  
  int y = (rect.Height() - cyIcon + 1) / 2; 2<6UwF  
  // Draw the icon +[ZY:ZQ  
  dc.DrawIcon(x, y, m_hIcon); #9s,# }  
 } (k P9hcV  
 else (m$Y<{)2  
 { +`15le`R  
  CDialog::OnPaint(); *WZA9G#V5  
 } 4ppz,L,4  
} JGZBL{8  
I=#$8l.*  
HCURSOR CCaptureDlg::OnQueryDragIcon() I+(nu47ZT  
{ qgB_=Q#E  
 return (HCURSOR) m_hIcon; @F>D+=hS  
} $VR{q6[0S?  
i~72bMwsA  
void CCaptureDlg::OnCancel() =pr7G+_u  
{ XP}<N&j  
 if(bTray) A}w/OA97RO  
  DeleteIcon(); G/W>S,(  
  CDialog::OnCancel(); atzX;@"K  
} >Gu M]qn  
dWW.Y*339  
void CCaptureDlg::OnAbout() 6~+e mlD  
{ |[lKY+26:{  
 CAboutDlg dlg; 8,|kao:  
 dlg.DoModal(); I 6O  
} g{LP7 D;6  
)PZT4jTt  
void CCaptureDlg::OnBrowse() V~#tuv  
{ d=^z`nt !R  
 CString str; r|Z{-*`  
 BROWSEINFO bi; 3XKf!P  
 char name[MAX_PATH]; k{0o9,  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ipz5H*  
 bi.hwndOwner=GetSafeHwnd(); !~Z"9(v'C  
 bi.pszDisplayName=name; ,//S`j$S  
 bi.lpszTitle="Select folder"; 8EY:t zw  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ^sZ,2,^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0{mex4  
 if(idl==NULL) Zd&S@Z  
  return; ('~LMu_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &Qm@9Is  
 str.ReleaseBuffer(); !m$jk2<  
 m_Path=str; ,,TnIouy  
 if(str.GetAt(str.GetLength()-1)!='\\') $ Q0n  
  m_Path+="\\"; 31)&vf[[  
 UpdateData(FALSE); fy$1YI>!Q  
} 6B-16  
t,' <gI  
void CCaptureDlg::SaveBmp() h];I{crh  
{ cCX*D_kCB  
 CDC dc; (sj,[  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); s^SJY{  
 CBitmap bm; ]^]wP]R_  
 int Width=GetSystemMetrics(SM_CXSCREEN); kVL.PY\K  
 int Height=GetSystemMetrics(SM_CYSCREEN); }WV:erg`  
 bm.CreateCompatibleBitmap(&dc,Width,Height); `X8F`5&U\f  
 CDC tdc; V.Mry`9-  
 tdc.CreateCompatibleDC(&dc); T C"<g  
 CBitmap*pOld=tdc.SelectObject(&bm); QW"! (`K  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7Lt)nq-b  
 tdc.SelectObject(pOld); 05[SC}MCA  
 BITMAP btm; %)wjR/o  
 bm.GetBitmap(&btm); \v/[6&|X0s  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Ss`LLq0LO  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ^}r1;W?n  
 BITMAPINFOHEADER bih; T0 {Lq:  
 bih.biBitCount=btm.bmBitsPixel; r*Xuj=  
 bih.biClrImportant=0; 28nFRr  
 bih.biClrUsed=0; F[0]/  
 bih.biCompression=0; ~ K=b\xc^  
 bih.biHeight=btm.bmHeight; Mp]rUPK  
 bih.biPlanes=1; pJ{Y lS{  
 bih.biSize=sizeof(BITMAPINFOHEADER); W>LR\]Ti@  
 bih.biSizeImage=size; ?# fQ~ s  
 bih.biWidth=btm.bmWidth; .^g p?  
 bih.biXPelsPerMeter=0; 'PHl$f*k  
 bih.biYPelsPerMeter=0; +h$ 9\  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); cnLro  
 static int filecount=0; W8<%[-r  
 CString name; ,vDbp?)'U  
 name.Format("pict%04d.bmp",filecount++); d'2A,B~_*  
 name=m_Path+name; ~5g~;f[4  
 BITMAPFILEHEADER bfh; `{Ul!  
 bfh.bfReserved1=bfh.bfReserved2=0; 1Z;iV<d  
 bfh.bfType=((WORD)('M'<< 8)|'B'); YzWz|  
 bfh.bfSize=54+size; Y ay?=Y{  
 bfh.bfOffBits=54; Mfs?x a  
 CFile bf; ;=N# `l  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9B4&m|g  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); K%d&EYoW]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0aAoV0fMDz  
  bf.WriteHuge(lpData,size); o}!PQ#`M  
  bf.Close(); cu6Opq9  
  nCount++; DrQ`]]jj7  
 } /E>e"tvss  
 GlobalFreePtr(lpData); [!z,lY>  
 if(nCount==1) u4j5w  
  m_Number.Format("%d picture captured.",nCount); Q20 %"&Xp]  
 else he4(hX^  
  m_Number.Format("%d pictures captured.",nCount); Y0>y8U V  
  UpdateData(FALSE); *2?@ |<(r  
} &FD>&WRV  
.u:GjL'$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]{iQ21`a-  
{ $C\BcKlmv  
 if(pMsg -> message == WM_KEYDOWN) :%.D78&  
 { ?8$Q-1=  
  if(pMsg -> wParam == VK_ESCAPE) z@Y;r=v  
   return TRUE; oQ#8nu{k  
  if(pMsg -> wParam == VK_RETURN) m2o0y++TjW  
   return TRUE; ]tD]Wx%  
 } v1[29t<I!  
 return CDialog::PreTranslateMessage(pMsg); =fbWz  
} :r[`.`  
wbHb;]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %LV9=!w  
{ ..qCPlK;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ YMgNzu  
  SaveBmp(); G?ZXWu.  
  return FALSE; ;fJ.8C  
} yw!{MO  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2?5>o!C  
 CMenu pop; q@qsp&0/  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $k?>DP 4  
 CMenu*pMenu=pop.GetSubMenu(0); Y} /-C3)  
 pMenu->SetDefaultItem(ID_EXITICON); P%6~&woF  
 CPoint pt; : 'c&,oLY  
 GetCursorPos(&pt); i$@:@&(~Y  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); rc{v$.o0  
 if(id==ID_EXITICON) yLGRi^d#  
  DeleteIcon(); N$DkX)Z  
 else if(id==ID_EXIT) *Uh!>Iv;  
  OnCancel(); 9F vFhY  
 return FALSE; g*Phv|kI  
} '7/)Ot(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); B6"0OIDY"  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `gJ(0#ac  
 AddIcon(); Gq6*SaTk  
 return res; TJN4k@\$2  
} Si7*& dw=  
aYeR{Y]  
void CCaptureDlg::AddIcon() JLYi]nZ  
{ %RVZD#zr  
 NOTIFYICONDATA data; y(&Ac[foS}  
 data.cbSize=sizeof(NOTIFYICONDATA); 6mE\OS-I  
 CString tip; y2v^-q3  
 tip.LoadString(IDS_ICONTIP); TV:9bn?r)  
 data.hIcon=GetIcon(0); Mhu*[a=;x  
 data.hWnd=GetSafeHwnd(); XuTD\g3)  
 strcpy(data.szTip,tip); O8o3O 6[Y  
 data.uCallbackMessage=IDM_SHELL; p'k0#R$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; (mOtU8e  
 data.uID=98; =vPj%oLp'a  
 Shell_NotifyIcon(NIM_ADD,&data); 5\v3;;A[  
 ShowWindow(SW_HIDE); CAe!7HiR  
 bTray=TRUE; ;`Z{7'^U  
} GVz6-T~\>  
Zc yc*{DS  
void CCaptureDlg::DeleteIcon() ?5p>BER?  
{ i?/qY&~  
 NOTIFYICONDATA data; q| 7(  
 data.cbSize=sizeof(NOTIFYICONDATA); ==B6qX8T  
 data.hWnd=GetSafeHwnd(); ,_P-$lB  
 data.uID=98; b' y%n   
 Shell_NotifyIcon(NIM_DELETE,&data); W/ \g~=vo  
 ShowWindow(SW_SHOW); No$3"4wk  
 SetForegroundWindow();  bLL2  
 ShowWindow(SW_SHOWNORMAL); HsWk*L `y  
 bTray=FALSE; QWU[@2@%r  
} 5^cCY'I  
YQ} o?Q$z  
void CCaptureDlg::OnChange() .X&9Q9T=#  
{ ^pS~Z~[d/  
 RegisterHotkey(); jo7\`#(Q  
} t:S+%u U  
LP-o8c  
BOOL CCaptureDlg::RegisterHotkey() =AT."$r>  
{ So6x"1B  
 UpdateData(); IgzQr >  
 UCHAR mask=0; 3R/bz0 V>  
 UCHAR key=0; 'R)Tn!6  
 if(m_bControl) KoRV %@I  
  mask|=4;  \*da6Am  
 if(m_bAlt) 0_/[k*Re  
  mask|=2; y} '@R$  
 if(m_bShift) 2!\D PX  
  mask|=1; N mG#   
  key=Key_Table[m_Key.GetCurSel()]; QP x^_jA  
 if(bRegistered){ t-AmX) $  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); rOYx b }1  
  bRegistered=FALSE; MA\V[32H  
 } GY*p?k<i  
 cMask=mask; cNrg#Asen&  
 cKey=key; /QQ*8o8  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Q59suL   
 return bRegistered; ?0.NIu,,o  
} +3gp%`c4  
=wJX 0A|  
  四、小结 @WhHUd4s  
=M1I>  
  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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