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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: fF!Yp iI"  
  NJ%P/\ C  
  一、实现方法 +C^nO=[E  
_>o:R$ %}  
  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: l] K3Y\#bP  
{X!r8i  
#pragma data_seg("shareddata") vz@A;t  
HHOOK hHook =NULL; //钩子句柄 {UX!go^J  
UINT nHookCount =0; //挂接的程序数目  g T6z9  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 #>a\>iKQ2q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 S^JbyD_yoh  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 6gU96Z  
static int KeyCount =0; pE3?"YO  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 vSGH[nyCY  
#pragma data_seg() =eq[:K<6  
: p1u(hflS  
  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。 7zl5yK N  
] 7[ 3>IN  
  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: k`cfG\;r  
Gf%~{@7=u  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cRC6 s8  
cKey,UCHAR cMask) I:-Wy"i  
{ P7ao5NP  
 BOOL bAdded=FALSE; 3 #n_?-  
 for(int index=0;index<MAX_KEY;index++){ A\*>TN>s  
  if(hCallWnd[index]==0){ Ky`qskvu  
   hCallWnd[index]=hWnd; =?5]()'*n  
   HotKey[index]=cKey; i9:C4',sw0  
   HotKeyMask[index]=cMask; !K#qeY}  
   bAdded=TRUE; a)!o @  
   KeyCount++; oe ~'o'  
   break;  }t!Gey  
  } HRpte=`q  
 } b3P+H r  
 return bAdded; \Zb;'eDv  
} !@5 9)  
//删除热键 pj8=wch  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qRu~$K  
{ b;L\EB  
 BOOL bRemoved=FALSE; Q@=Q0  
 for(int index=0;index<MAX_KEY;index++){ k<z )WNBf  
  if(hCallWnd[index]==hWnd){ xPdG*OcX!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,10=  
    hCallWnd[index]=NULL; wC"FDr+  
    HotKey[index]=0; M+oHtX$  
    HotKeyMask[index]=0; ~ \r*  
    bRemoved=TRUE; HGl|-nW>  
    KeyCount--; o]odxr  
    break; n5|fHk^s  
   } O4 w(T  
  } "BAK !N$9  
 } g9OY<w5s]  
 return bRemoved; BqEI(c 6  
} r[e##M  
(xycJ`N  
\-E^lIVF  
  DLL中的钩子函数如下: V(}:=eK  
pG_;$8Hc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zxEL+P  
{ Xa[.3=bV?  
 BOOL bProcessed=FALSE; y4yhF8E>;U  
 if(HC_ACTION==nCode) @ 8(q$  
 { A]*}HZ ,  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 fT|.@%"vc  
   switch(wParam) Od,=mO*.Q  
   {  ]IaMp788  
    case VK_MENU: ~"gA,e-)  
     MaskBits&=~ALTBIT; rV.}PtcFY  
     break; C-xr"]#]  
    case VK_CONTROL: @b\$yB@z  
     MaskBits&=~CTRLBIT; `&qL(66  
     break; W@>% {eE  
    case VK_SHIFT: &{5,:%PXw  
     MaskBits&=~SHIFTBIT; sVQ|*0(J0r  
     break; KV91)U  
    default: //judge the key and send message \eTwXe]Pv  
     break; KA5v+~  
   } _r#Z}HK  
   for(int index=0;index<MAX_KEY;index++){ qyb?49I  
    if(hCallWnd[index]==NULL) '(6z. toQ  
     continue; yHYsZ,GE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `K"L /I9  
    { UhF-K#Z9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); oE @a'*.\  
     bProcessed=TRUE; 3l]lwV  
    } hXw]K"  
   } RIR\']WN  
  } x%=si[P  
  else if((lParam&0xc000ffff)==1){ //有键按下 6dQ-HI*Y#  
   switch(wParam) a9e>iU  
   { {'flJ5]  
    case VK_MENU: 4X/-4'  
     MaskBits|=ALTBIT; 3=#<X-);  
     break; E#RDqL*J  
    case VK_CONTROL: xH4m|  
     MaskBits|=CTRLBIT;  y`iBFC;_  
     break; q~Hn -5H4Q  
    case VK_SHIFT: y G~?MEh{  
     MaskBits|=SHIFTBIT; _{ue8kGt  
     break; ,O5NLg-  
    default: //judge the key and send message #!B4 u?"m  
     break; !"e5h`/ADM  
   } 810|Tj*U%  
   for(int index=0;index<MAX_KEY;index++){ c?Y*Y   
    if(hCallWnd[index]==NULL) AD> e?u  
     continue; uo:J\E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qw301]y  
    { c2SO3g\"i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >dXGee>'M  
     bProcessed=TRUE; t|?ez4/{z  
    } @/~omg}R  
   } iO$8:mxm0?  
  } Cl.x'v  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [|wZ77\  
   for(int index=0;index<MAX_KEY;index++){ Z{.8^u1I  
    if(hCallWnd[index]==NULL) NSMyliM1Y  
     continue; ZmqKQO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wVXS%4|v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); W-f=]eWg  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Z3e| UAif  
   } /V8 #[9K  
  } yqs4[C  
 } ,oe <  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); J-:.FKf\5l  
} T  wB}l  
;<Sd~M4f  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: >h1}~jW+  
hF?1y`20  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L&8~f]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jwe*(k]z  
lgAoJ[  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: l9~e". ~'  
h8j.(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) B4/>H|  
{ ? V1*cVD6i  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0 JS?;fk  
 { t,Lrfv])  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 e ,'_xV  
  SaveBmp(); OKZV{Gja  
  return FALSE; 234p9A@  
 } GMx&y2. Z  
 …… //其它处理及默认处理 @u+]aI!`-  
} `RT>}_j  
fb7;|LF  
G>_*djUf  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ]#<4vl\  
lBE= (A`  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。  7Die FZ?  
eIF5ZPSZi  
  二、编程步骤 "!P3R1;%  
%`r$g[<G  
  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"; b6M[q_   
+ J{IRyBc  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; unzr0x {  
pad*oPH,  
  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; &E F!OBR  
"^[ 'y7i  
  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; bP#:Oi0v`  
NYUL:Tp  
  5、 添加代码,编译运行程序。 atH*5X6d  
7"D", 1h  
三、程序代码 ]%SH>  
{W`%g^Z|H  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _ye |Y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) XX!%RE`M8  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ :G=fl)!fE  
#if _MSC_VER > 1000 Ny7S  
#pragma once y7cl_rK  
#endif // _MSC_VER > 1000 l4YbKnp]  
#ifndef __AFXWIN_H__ c]<5zyl"j1  
#error include 'stdafx.h' before including this file for PCH 0o4XUW   
#endif VCfl`Aq'l  
#include "resource.h" // main symbols s) t@ol  
class CHookApp : public CWinApp M?49TOQA  
{ (x|T+c"bAX  
 public: G>=*yqo  
  CHookApp(); octL"t8w  
  // Overrides C& f= ywi0  
  // ClassWizard generated virtual function overrides s^TZXCyF o  
  //{{AFX_VIRTUAL(CHookApp) FGJ1dBLr  
 public: 'BxX0  
  virtual BOOL InitInstance(); 0auYG><=  
  virtual int ExitInstance(); FUzzB94a  
  //}}AFX_VIRTUAL By,eETU]  
  //{{AFX_MSG(CHookApp) 8`{:MkXP  
  // NOTE - the ClassWizard will add and remove member functions here. (m}'4et~L  
  // DO NOT EDIT what you see in these blocks of generated code ! a!SiX  
  //}}AFX_MSG }#+^{P3;  
  DECLARE_MESSAGE_MAP() Po0A#Zl  
}; I,DS@SK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); QL/(72K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jd"@t*ZV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4@gG<QJW  
BOOL InitHotkey(); U>SShpmZA  
BOOL UnInit(); Vt~{Gu-Y  
#endif Pm?KI<TH~  
M0"_^?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. y<3-?}.aZ  
#include "stdafx.h" V &T~zh1  
#include "hook.h" (L:>\m&NO  
#include <windowsx.h> )q4[zv9  
#ifdef _DEBUG B-Hrex]  
#define new DEBUG_NEW #%2rP'He  
#undef THIS_FILE 5;WH:XM  
static char THIS_FILE[] = __FILE__; ;;t yoh~t  
#endif MchA{p&Ol  
#define MAX_KEY 100 {Mk6T1Bkq  
#define CTRLBIT 0x04 `(;m?<%  
#define ALTBIT 0x02 a-tmq]]E  
#define SHIFTBIT 0x01 @1j   
#pragma data_seg("shareddata") QIEJ6`  
HHOOK hHook =NULL;  /maJtX'  
UINT nHookCount =0; W@IQ^ }E  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Rp7mh]kZ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -i|}m++  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey cVpp-Z|s8  
static int KeyCount =0; IPpN@  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift y.k~Y0  
#pragma data_seg() !BF; >f`  
HINSTANCE hins; ^7*11%Q  
void VerifyWindow(); 372rbY  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) TX/Xt7#R:  
//{{AFX_MSG_MAP(CHookApp) ; 2#y7!  
// NOTE - the ClassWizard will add and remove mapping macros here. Tidn-2L73O  
// DO NOT EDIT what you see in these blocks of generated code! t?gic9 q  
//}}AFX_MSG_MAP T!{w~'=F  
END_MESSAGE_MAP() fOrH$?  
^76]0`gS  
CHookApp::CHookApp() re<{ >  
{ ="H%6S4'  
 // TODO: add construction code here, |Ez>J+uye(  
 // Place all significant initialization in InitInstance 6MW{,N  
} P+sW[:  
gH vZVC[b  
CHookApp theApp; ]EAO+x9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) i]4I [!  
{ n@i HFBb  
 BOOL bProcessed=FALSE; !qg`/y9  
 if(HC_ACTION==nCode) Ml5w01O  
 { >=>2m2z=  
  if((lParam&0xc0000000)==0xc0000000){// Key up & .j&0WE  
   switch(wParam) ^ytrK Q  
   { JbbzV>  
    case VK_MENU: ,0sm  
     MaskBits&=~ALTBIT; pv&sO~!iC  
     break; eByz-,{P  
    case VK_CONTROL: e *C(q~PQ  
     MaskBits&=~CTRLBIT; JQI: sj  
     break; q;CiV  
    case VK_SHIFT: A)!*]o>U  
     MaskBits&=~SHIFTBIT; x,- 75  
     break; J@'wf8Ub  
    default: //judge the key and send message "S]TP$O D  
     break; )&O %*@F  
   } 3 i0_hZ  
   for(int index=0;index<MAX_KEY;index++){ 'H!Uh]!  
    if(hCallWnd[index]==NULL) BU_nh+dF  
     continue; am'7uy!ka~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kzLsoZ!I  
    { X_h}J=33Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cT,sh~-x,  
     bProcessed=TRUE; {tZ.v@  
    } m s \}  
   } {\5  
  } =T@1@w  
  else if((lParam&0xc000ffff)==1){ //Key down )10+@d  
   switch(wParam) <'*LRd$1  
   { 0~S^Y1hH  
    case VK_MENU: ;^*W+,4WB  
     MaskBits|=ALTBIT; *)Zdz9E'1(  
     break; eMsd37J  
    case VK_CONTROL: CTa57R  
     MaskBits|=CTRLBIT; x;d6vBTUb  
     break; 6{b >p+U  
    case VK_SHIFT: IJ"q~r$  
     MaskBits|=SHIFTBIT; D@.6>:;il  
     break; VONDc1%ga  
    default: //judge the key and send message eauF ~md,  
     break; 0h_|t-9j  
   } Y3b *a".X  
   for(int index=0;index<MAX_KEY;index++) +0Y&`{#Z  
   { %u'u kcL7  
    if(hCallWnd[index]==NULL) 6&x@.1('z  
     continue; 0,")C5j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZE}}W _  
    { :I#V.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &QgR*,5eo  
     bProcessed=TRUE; }}~|!8  
    } C'x&Py/#  
   } :o3N;*o>)0  
  } l_p2Riv  
  if(!bProcessed){ ,J@  
   for(int index=0;index<MAX_KEY;index++){ 0l6.<-f{  
    if(hCallWnd[index]==NULL) &u !,Hp  
     continue; 02^rV*re  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mzgfFNm^G)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Zy/_ E@C}u  
   } ;=z:F<Y  
  } @ 6vIap|  
 } 4WB0Pt{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); fJg+Ryo  
} UK!(G  
n[rCQdM&U"  
BOOL InitHotkey() $UwCMPs X  
{ ]f_p 8?j"  
 if(hHook!=NULL){ 9.#<b |g  
  nHookCount++; mfr|:i  
  return TRUE; z{QqY.Gu{G  
 } W=?<<dVYD  
 else ? J0y|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Z`i(qCAd(  
  if(hHook!=NULL) %N._w!N<5n  
   nHookCount++; 6gDN`e,@  
  return (hHook!=NULL); {Sh ;(.u^  
} W>r+h-kR  
BOOL UnInit() J&_n9$  
{ RA 6w}:sq7  
 if(nHookCount>1){ 9(Xn>G'iT  
  nHookCount--; Di{de`  
  return TRUE; wCBplaojJ  
 } :ws<-Qy  
 BOOL unhooked = UnhookWindowsHookEx(hHook); p_4<6{KEt  
 if(unhooked==TRUE){ m&3xJuKih  
  nHookCount=0; ~} ~4  
  hHook=NULL; / ;$[E  
 } OyIw>Wfv  
 return unhooked; "AqB$^S9t  
} 8oGRLYU N  
2 %]X+`+O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $??I/6  
{ HPVEnVn  
 BOOL bAdded=FALSE; d'> x(Yi  
 for(int index=0;index<MAX_KEY;index++){ QJ;2ZN,  
  if(hCallWnd[index]==0){ c+ie8Q!  
   hCallWnd[index]=hWnd; ueNS='+m  
   HotKey[index]=cKey; *un^u-;  
   HotKeyMask[index]=cMask; pxi3PY?  
   bAdded=TRUE; #'}*dy/  
   KeyCount++; :`sUt1Fw.  
   break; h68 xet;  
  } &p,]w~d,U  
 } MdF2Gk-9  
 return bAdded; (9)Q ' 'S  
} Q!3_$<5<E>  
uY*L,j^)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *Pr )%  
{ i6Gu@( 8Q  
 BOOL bRemoved=FALSE; *4 n)  
 for(int index=0;index<MAX_KEY;index++){ >\8+: oS^  
  if(hCallWnd[index]==hWnd){ K 8O|?x]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /dHF6yW  
    hCallWnd[index]=NULL; /bmN\I  
    HotKey[index]=0; a+QpM*n7Lq  
    HotKeyMask[index]=0; Ny# ^&-K  
    bRemoved=TRUE; Gc7=  
    KeyCount--; '3;b@g,  
    break; RnN!2K  
   } W,u:gzmhw  
  } [Rb+q=z#  
 } q3`u1S7Z7  
 return bRemoved; zuCSj~  
} ,!9zrYi}  
,zc(t<|-y  
void VerifyWindow() L/[K"  
{ 2g<Xtt7+o  
 for(int i=0;i<MAX_KEY;i++){ jEwIn1  
  if(hCallWnd!=NULL){ !r-F>!~  
   if(!IsWindow(hCallWnd)){ 2mU.7!g)  
    hCallWnd=NULL; 7>RY/O;Z,  
    HotKey=0; rN>R|].  
    HotKeyMask=0; *zLMpL_  
    KeyCount--; 5r0YA IJ  
   } qQa}wcU'9p  
  } :6dxtl/{b:  
 } Y);=TM6s  
} I1J-)R+  
AZ<= o  
BOOL CHookApp::InitInstance() PvL[e"p  
{ ^zr`;cJ+c  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Y/oHu@ _  
 hins=AfxGetInstanceHandle(); +C)~bb*  
 InitHotkey(); i#O SC5ZI  
 return CWinApp::InitInstance(); UxBpdm%dvP  
} X3& Jb2c2  
1~gCtBRM  
int CHookApp::ExitInstance() PY'2h4IL  
{ 2<6UwF  
 VerifyWindow(); p7 ~!z.)o  
 UnInit(); !x)R=Z/C  
 return CWinApp::ExitInstance(); #9s,# }  
} (k P9hcV  
xD7]C|8o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file /{2,zW  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) kxCSs7J/  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4ppz,L,4  
#if _MSC_VER > 1000 JGZBL{8  
#pragma once n"8Yv~v*2j  
#endif // _MSC_VER > 1000 EX"yxZ~  
K NOIZj   
class CCaptureDlg : public CDialog n{jGOfc  
{ "  1tH  
 // Construction >mkFV@`  
 public: jWgX_//!  
  BOOL bTray; H/Jbk*Q  
  BOOL bRegistered; +|f@^-  
  BOOL RegisterHotkey(); ?A0)L27UE&  
  UCHAR cKey; O0:q;<>z  
  UCHAR cMask; |BYRe1l6l  
  void DeleteIcon(); ykJ>*z  
  void AddIcon(); $Kd>:f=A  
  UINT nCount; 7$#u  
  void SaveBmp(); kf9X$d6   
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor xx $cnG  
  // Dialog Data +ai< q>+  
  //{{AFX_DATA(CCaptureDlg) 8,|kao:  
  enum { IDD = IDD_CAPTURE_DIALOG }; I 6O  
  CComboBox m_Key; b MBLXk  
  BOOL m_bControl; d'ifLQ\  
  BOOL m_bAlt; 1H9!5=Ff  
  BOOL m_bShift; z!\*Y =e  
  CString m_Path; r|Z{-*`  
  CString m_Number; w(F%^o\  
  //}}AFX_DATA 0}9h]X'  
  // ClassWizard generated virtual function overrides sq]F;=[5  
  //{{AFX_VIRTUAL(CCaptureDlg) < Z$J<]I  
 public: 3gzXbP,  
  virtual BOOL PreTranslateMessage(MSG* pMsg); yQrD9*t&g  
 protected: 7:~_D7n  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support q\)-BXw:  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); T{'RV0%   
  //}}AFX_VIRTUAL Ca-j?bb!  
  // Implementation /Kbl%u  
 protected: {+Jv+J9  
  HICON m_hIcon; DwF hK*  
  // Generated message map functions #E]59_  
  //{{AFX_MSG(CCaptureDlg) <N @Gu!N8  
  virtual BOOL OnInitDialog(); f mGc^d|=  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); QL*IiFR  
  afx_msg void OnPaint(); 92{\B- l  
  afx_msg HCURSOR OnQueryDragIcon(); ?ubro0F:  
  virtual void OnCancel(); $d4n"+7  
  afx_msg void OnAbout(); '>" 4  
  afx_msg void OnBrowse(); ^@]3R QB  
  afx_msg void OnChange(); `mqMLo *  
 //}}AFX_MSG \NC3'G:Ii  
 DECLARE_MESSAGE_MAP() Mihg:  
}; P;*(hY5&  
#endif ,?3G;-  
E"0>yl)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >d6|^h'0  
#include "stdafx.h" mc3"`+o  
#include "Capture.h" Ts9uL5i  
#include "CaptureDlg.h" I:.s_8mH}  
#include <windowsx.h> M3AXe]<eC1  
#pragma comment(lib,"hook.lib") Pc9H0\+Xk  
#ifdef _DEBUG ] R*A  
#define new DEBUG_NEW @PU [:;  
#undef THIS_FILE PW4q~rc=:  
static char THIS_FILE[] = __FILE__; 28nFRr  
#endif SAz   
#define IDM_SHELL WM_USER+1 =">NQ)98u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j!ch5A  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nDW9NQ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; W>LR\]Ti@  
class CAboutDlg : public CDialog D,6:EV"sa  
{ t&p|Ynz?i  
 public: 'PHl$f*k  
  CAboutDlg(); +h$ 9\  
  // Dialog Data cnLro  
  //{{AFX_DATA(CAboutDlg)  3CJwj  
  enum { IDD = IDD_ABOUTBOX }; KTv$  
  //}}AFX_DATA ;Xw~D_uv  
  // ClassWizard generated virtual function overrides d'2A,B~_*  
  //{{AFX_VIRTUAL(CAboutDlg) ~5g~;f[4  
 protected: `{Ul!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o(HbGHIP  
  //}}AFX_VIRTUAL pXUSLs  
  // Implementation (#'>(t(4  
 protected: @@%ataUSBT  
  //{{AFX_MSG(CAboutDlg) q*KAk{kR(v  
  //}}AFX_MSG 16 $B>  
  DECLARE_MESSAGE_MAP() ;nGa.= "L  
}; o}!PQ#`M  
cu6Opq9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) DrQ`]]jj7  
{ /E>e"tvss  
 //{{AFX_DATA_INIT(CAboutDlg) [!z,lY>  
 //}}AFX_DATA_INIT u4j5w  
}  XilS!,  
P%zK;#8V  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) CWlw0 X  
{ M`>E|" <  
 CDialog::DoDataExchange(pDX); 1"g<0 W  
 //{{AFX_DATA_MAP(CAboutDlg) >V~E]P%@  
 //}}AFX_DATA_MAP Lv%x81]K  
} 26nx`w?j(  
$C\BcKlmv  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) :%.D78&  
 //{{AFX_MSG_MAP(CAboutDlg) ?8$Q-1=  
 // No message handlers z@Y;r=v  
 //}}AFX_MSG_MAP Vc2`b3"Br  
END_MESSAGE_MAP() m2o0y++TjW  
]tD]Wx%  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) SdWV3  
: CDialog(CCaptureDlg::IDD, pParent) &o*A {  
{ <q SC#[xu  
 //{{AFX_DATA_INIT(CCaptureDlg) OY d !v`<  
  m_bControl = FALSE;  `]X>V,  
  m_bAlt = FALSE; kFB  
  m_bShift = FALSE; vbNBLCwug  
  m_Path = _T("c:\\"); ]! dTG  
  m_Number = _T("0 picture captured."); PdCEUh\>y  
  nCount=0; 9my^ Y9B  
  bRegistered=FALSE; q7!{?\T%  
  bTray=FALSE; OH88n69  
 //}}AFX_DATA_INIT 7"mc+QOp  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Zh,71Umz  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); g ?k=^C  
} IU[ [ H#  
<N)oS-m>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) >bxS3FCX  
{ YN,A )w:]  
 CDialog::DoDataExchange(pDX); k\IbIv7?i  
 //{{AFX_DATA_MAP(CCaptureDlg) q@&6#B  
  DDX_Control(pDX, IDC_KEY, m_Key); R@0R`Zs  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); p[-O( 3Y  
  DDX_Check(pDX, IDC_ALT, m_bAlt); R2;  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1,~D4lD|  
  DDX_Text(pDX, IDC_PATH, m_Path); y^k$Us  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /,dz@   
 //}}AFX_DATA_MAP gSgr6TH0  
} Gq6*SaTk  
TJN4k@\$2  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Si7*& dw=  
//{{AFX_MSG_MAP(CCaptureDlg) nEfK53i_  
 ON_WM_SYSCOMMAND() <[v[ci  
 ON_WM_PAINT() q<J~~'  
 ON_WM_QUERYDRAGICON() nu^436MSOa  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ]yu:i-SfP  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) G6/m#  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >0gW4!7Y  
//}}AFX_MSG_MAP ebq4g387X  
END_MESSAGE_MAP() nNm`Hfi  
4W])}C %  
BOOL CCaptureDlg::OnInitDialog() qLCR] _*  
{ N;d] 14|  
 CDialog::OnInitDialog(); DqPw#<"H  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -} +[  
 ASSERT(IDM_ABOUTBOX < 0xF000); u!s2 BC0}N  
 CMenu* pSysMenu = GetSystemMenu(FALSE); So;<6~  
 if (pSysMenu != NULL) .6> w'F{>  
 { z{6Z 11|  
  CString strAboutMenu; %C0Dw\A*:  
  strAboutMenu.LoadString(IDS_ABOUTBOX); h 0|s  
  if (!strAboutMenu.IsEmpty()) L-Lvp%%  
  { >usL*b0%  
   pSysMenu->AppendMenu(MF_SEPARATOR); =v\.h=~~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ':q p05t  
  } ,I9bNO,%JK  
 } BWNi [^]  
 SetIcon(m_hIcon, TRUE); // Set big icon >eaaaq9B-  
 SetIcon(m_hIcon, FALSE); // Set small icon No$3"4wk  
 m_Key.SetCurSel(0);  bLL2  
 RegisterHotkey(); : DNjhZ  
 CMenu* pMenu=GetSystemMenu(FALSE); E{\2='3\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Y@v>FlqI{  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *hrvYil2b  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); teP<!RKNb  
 return TRUE; // return TRUE unless you set the focus to a control t7pFW^&  
} C^){.UGmJ  
r^ XVB`v  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) jCY %|  
{ :]"V-1#}  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) gIfh3D=yX  
 { _GPe<H  
  CAboutDlg dlgAbout; <%^&2UMg  
  dlgAbout.DoModal(); *i,%,O96Nz  
 } xLE)/}y_7H  
 else vI?, 47Hj+  
 { 7^Uv7< pw  
  CDialog::OnSysCommand(nID, lParam); h;Qk @F  
 } sT.ss$HY9,  
} TvM~y\s  
2eogY#  
void CCaptureDlg::OnPaint() cl1T8vFM  
{ :3PH8TL  
 if (IsIconic()) +t.b` U`-  
 { MA\V[32H  
  CPaintDC dc(this); // device context for painting GY*p?k<i  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); cNrg#Asen&  
  // Center icon in client rectangle /QQ*8o8  
  int cxIcon = GetSystemMetrics(SM_CXICON); )+^+s d  
  int cyIcon = GetSystemMetrics(SM_CYICON); ~Ei<Z`3}7"  
  CRect rect; h;Kx!5)y  
  GetClientRect(&rect); TpaInXR  
  int x = (rect.Width() - cxIcon + 1) / 2; RCrCs  
  int y = (rect.Height() - cyIcon + 1) / 2; ;a/E42eN;  
  // Draw the icon :0/ 7,i  
  dc.DrawIcon(x, y, m_hIcon); #4:?gfIj  
 } #mT"gs  
 else 5-V pJ  
 { -LSWmrj  
  CDialog::OnPaint(); $qiya[&G4  
 } 9sP0D  
} #tHK"20  
:s,Z<^5a)g  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~u{uZ(~  
{ ,uvRi)O>a  
 return (HCURSOR) m_hIcon; zA 3_Lx!  
} kM 6 Qp  
NbobliC=  
void CCaptureDlg::OnCancel() VVZ'i.*_3?  
{ b>|6t~}M  
 if(bTray) W^Yxny  
  DeleteIcon(); l} /F*  
  CDialog::OnCancel(); hxx.9x>ow  
} K9[UB  
"Q0@/bYq  
void CCaptureDlg::OnAbout() Gt1U!dP  
{ PCvWS.{  
 CAboutDlg dlg; 3]>|  i  
 dlg.DoModal(); 0sqFF[i  
} >z03{=sAN  
]]mJ']l  
void CCaptureDlg::OnBrowse() sK{e*[I>W  
{ 9x8fhAy}4  
 CString str; 5R-6ji  
 BROWSEINFO bi; b 6p|q_e  
 char name[MAX_PATH]; XSDpRo  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y73C5.dNcE  
 bi.hwndOwner=GetSafeHwnd(); Ri{=]$  
 bi.pszDisplayName=name; oRFq @g  
 bi.lpszTitle="Select folder"; |>Vb9:q9Po  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ok[i<zl; '  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); {=WgzP  
 if(idl==NULL) yfSmDPh  
  return; hM{bavd  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 3F3A%C%  
 str.ReleaseBuffer(); +TJCLZ..  
 m_Path=str; M{@(G5  
 if(str.GetAt(str.GetLength()-1)!='\\') =(Mch~  
  m_Path+="\\";  g(052]  
 UpdateData(FALSE); f 2.HF@  
} q'DW~!>qX  
^#$n~]s  
void CCaptureDlg::SaveBmp() Wri<h:1  
{ b sX[UF  
 CDC dc; 53D]3  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); A<{{iBEI`  
 CBitmap bm; d~H`CrQE*  
 int Width=GetSystemMetrics(SM_CXSCREEN); 8r{.jFGv  
 int Height=GetSystemMetrics(SM_CYSCREEN); *g%yRU{N  
 bm.CreateCompatibleBitmap(&dc,Width,Height); fl(wV.Je|  
 CDC tdc; t!XwW$@  
 tdc.CreateCompatibleDC(&dc); s#11FfF`  
 CBitmap*pOld=tdc.SelectObject(&bm); o4X{L`m  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Wc#24:OKe3  
 tdc.SelectObject(pOld); +2{Lh7Ks  
 BITMAP btm; Oz95  
 bm.GetBitmap(&btm); Pal=F0-Q\  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; NOva'qk  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); %Zi} MPx  
 BITMAPINFOHEADER bih; p'%s=TGwv  
 bih.biBitCount=btm.bmBitsPixel; WE?5ehEme  
 bih.biClrImportant=0; ]/Pn EU[  
 bih.biClrUsed=0; fex@,I&  
 bih.biCompression=0; f8~_E  
 bih.biHeight=btm.bmHeight; W4S,6(  
 bih.biPlanes=1; <YY14p  
 bih.biSize=sizeof(BITMAPINFOHEADER); >Ry01G]_/h  
 bih.biSizeImage=size; $mILoy B,  
 bih.biWidth=btm.bmWidth; !zo{tI19  
 bih.biXPelsPerMeter=0; ! mHO$bQ"  
 bih.biYPelsPerMeter=0; CrLrw T  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5+'<R8{:,  
 static int filecount=0; GJrG~T  
 CString name; C_Dn{  
 name.Format("pict%04d.bmp",filecount++); ;+%rw2Z,B  
 name=m_Path+name; ;I}fBZ 3  
 BITMAPFILEHEADER bfh; $i&zex{\  
 bfh.bfReserved1=bfh.bfReserved2=0; uFE)17E  
 bfh.bfType=((WORD)('M'<< 8)|'B'); C Z;6@{ o  
 bfh.bfSize=54+size; C]6O!Pb0  
 bfh.bfOffBits=54; )e{aN+  
 CFile bf; d6O[ @CyP  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5O% {{J  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); AH^/V}9H  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); I,tud!p`  
  bf.WriteHuge(lpData,size); +[VXs~I q  
  bf.Close(); Psf#c:*_)  
  nCount++; kmW4:EA%  
 } !g[Zfo2r"  
 GlobalFreePtr(lpData); V88p;K$+  
 if(nCount==1) Ac@VGT:9  
  m_Number.Format("%d picture captured.",nCount); *w&e\i|7  
 else uT"rq:N  
  m_Number.Format("%d pictures captured.",nCount); K0~rN.C!0  
  UpdateData(FALSE); 9w"*y#_  
} 1?}T=)3+$  
A^g(k5M*  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) dN q$}  
{ &~CI<\o P  
 if(pMsg -> message == WM_KEYDOWN)  ];m_4  
 { LVGe]lD  
  if(pMsg -> wParam == VK_ESCAPE) Xvu(vA  
   return TRUE; ]M=&+c>H~  
  if(pMsg -> wParam == VK_RETURN) aN?zmkPpov  
   return TRUE; /: "1Z]@  
 } <)9y{J}s:  
 return CDialog::PreTranslateMessage(pMsg); W1~0_;  
} o&%g8=n%  
:Ye !w$r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4s- !7  
{ sC'` ~}C  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G{}VPcrbC  
  SaveBmp(); @JMiO^  
  return FALSE; -n 1 v3  
} P:c w|Q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ M3\AY30L  
 CMenu pop; 54 T`OE =  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); iS^QTuk3%  
 CMenu*pMenu=pop.GetSubMenu(0); uRvP hkqm  
 pMenu->SetDefaultItem(ID_EXITICON); ,+k\p5P  
 CPoint pt; [y(MCf19  
 GetCursorPos(&pt); )nkY_' BV  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); L *wYx|  
 if(id==ID_EXITICON) y(#e}z:  
  DeleteIcon(); K- v#.e4  
 else if(id==ID_EXIT) D*jM1w_`  
  OnCancel(); pi(m7Ci"  
 return FALSE; S jqpec8  
} Lbgi7|&  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Wr 4,YQM  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) pK*TE5]  
 AddIcon(); Q ,g\  
 return res; dO'(2J8  
} ytImB`'\  
5m@V#2^P  
void CCaptureDlg::AddIcon() ?<!|  
{ oH@78D0A  
 NOTIFYICONDATA data; !$ JT e  
 data.cbSize=sizeof(NOTIFYICONDATA); C%u28|  
 CString tip; KlEpzJ98  
 tip.LoadString(IDS_ICONTIP); O- wzz  
 data.hIcon=GetIcon(0); -7ep{p-  
 data.hWnd=GetSafeHwnd(); sJZ iI}Xc  
 strcpy(data.szTip,tip); G|Ti4_w  
 data.uCallbackMessage=IDM_SHELL; ,tFg4k[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; YK_ 7ip.a[  
 data.uID=98; 5BIY<B+i  
 Shell_NotifyIcon(NIM_ADD,&data); - ).C  
 ShowWindow(SW_HIDE); _a, s )  
 bTray=TRUE; ,1`z"7\W  
} \fOEqe*5SM  
vx =&QavL  
void CCaptureDlg::DeleteIcon() #!=tDc &  
{ VbYdZCC  
 NOTIFYICONDATA data; ZJoM?g~WFI  
 data.cbSize=sizeof(NOTIFYICONDATA); }f ?y* H  
 data.hWnd=GetSafeHwnd(); mH(:?_KrS-  
 data.uID=98; zLQx%Yg!  
 Shell_NotifyIcon(NIM_DELETE,&data); }MySaL>  
 ShowWindow(SW_SHOW); >*bvw~y,  
 SetForegroundWindow(); ".%k6W<n  
 ShowWindow(SW_SHOWNORMAL); g)-te+?6  
 bTray=FALSE; 5P bW[  
} PCA4k.,T  
mFeP9MfJ  
void CCaptureDlg::OnChange() I%):1\)  
{ '/p4O2b,  
 RegisterHotkey(); ?6!LL5a.  
} P}iE+Z 3  
8ag!K*\ V<  
BOOL CCaptureDlg::RegisterHotkey() [E_9V%^  
{ lE;!TQj:X  
 UpdateData(); bA 2pbjg=  
 UCHAR mask=0; @Qe0! (_=  
 UCHAR key=0; btB%[]  
 if(m_bControl) 9c],<;{'  
  mask|=4; 637: oT_`O  
 if(m_bAlt) ceA9) {  
  mask|=2; }V>T M{  
 if(m_bShift) U$g?!Yl0  
  mask|=1; f);FoVa6  
  key=Key_Table[m_Key.GetCurSel()]; MV"=19]  
 if(bRegistered){ #yen8SskB  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 4-w{BZuS  
  bRegistered=FALSE; UiWg<_<t  
 } =4!mAo}  
 cMask=mask; $G>.\t  
 cKey=key; ]:;&1h3'7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }H4RR}g  
 return bRegistered; %O<BfIZ  
} Cx"sw }  
xno\s.H%]  
  四、小结 =1! 'QUc  
 _F{C\}  
  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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