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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: !X,S2-}"  
  '}}DPoV  
  一、实现方法 {=(4  
A,iXiDb3pK  
  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: w}E?FEe.  
%tu{`PN<  
#pragma data_seg("shareddata") w%$n)7<*  
HHOOK hHook =NULL; //钩子句柄 0lBl5k e  
UINT nHookCount =0; //挂接的程序数目 sG}9l1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 O/5W-u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 )45,~+XX  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey EZ=M^0=Hpf  
static int KeyCount =0; / )EB~|4']  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 gF:wdcO  
#pragma data_seg() A^m hPBT_  
)dvOg'it  
  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。 x~mXtqg  
& v`kyc  
  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: v(0vP}[Q7E  
F )tNA?p)  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  ^@ux  
cKey,UCHAR cMask) }cf-r>WaR  
{ AfY(+w6!K  
 BOOL bAdded=FALSE; :@p`E}1r{  
 for(int index=0;index<MAX_KEY;index++){ !cq4+0{O;&  
  if(hCallWnd[index]==0){ Sj*H4ZHD<&  
   hCallWnd[index]=hWnd; <^&'r5H  
   HotKey[index]=cKey; (g;Ff`P Pc  
   HotKeyMask[index]=cMask; w(@`g/b  
   bAdded=TRUE; $M><K  
   KeyCount++; y}3V3uqK  
   break; QO%LSRw  
  } 7X.1QSuE  
 } ar{e<&Bny  
 return bAdded; >Te{a*`"m:  
} Comu c  
//删除热键 i<T`]g  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) eFx*lYjA  
{ FJD*A`a  
 BOOL bRemoved=FALSE; ,CdI.kV>o2  
 for(int index=0;index<MAX_KEY;index++){ cbIW>IbM  
  if(hCallWnd[index]==hWnd){ m760K*:i\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5|/vc*m_0'  
    hCallWnd[index]=NULL; FqiK}K.~/  
    HotKey[index]=0; h0gT/x  
    HotKeyMask[index]=0; Fl O%O D  
    bRemoved=TRUE; ?oF@q :W  
    KeyCount--; 4x3`dvfp/  
    break; [IYs4Y5  
   } HsXFglQ  
  } ''(T3;^ +  
 } gi`ZFq@  
 return bRemoved; +I')>6  
} U_J|{*4S.!  
HgMDw/D(  
VP"L _Um  
  DLL中的钩子函数如下: 7j]@3D9[:p  
^=@%@mR/[C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) U9 If%0P  
{ @GEvI2Vf.0  
 BOOL bProcessed=FALSE; N0XGW_f  
 if(HC_ACTION==nCode) XR+2|o  
 { 9*x9sfCv9  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [m"X*Z F  
   switch(wParam) .c',?[S/vH  
   {  ePF9Vzq  
    case VK_MENU: f"-?%I*'  
     MaskBits&=~ALTBIT; b1^MX).vH  
     break; SQHV gj  
    case VK_CONTROL: g"!B |  
     MaskBits&=~CTRLBIT;  t9=rr>8)  
     break; |?0C9  
    case VK_SHIFT: ;m\(fW*ii  
     MaskBits&=~SHIFTBIT; QOOBCNe  
     break; 9:m+mpL=9  
    default: //judge the key and send message 6tJM*{$$H  
     break; |_A35"v  
   } 1wq 6E  
   for(int index=0;index<MAX_KEY;index++){ -}>Q0d)  
    if(hCallWnd[index]==NULL) Z2ZS5a  
     continue; c2i^dNp_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QTDI^ZeuF  
    { @Wv*`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 'E@D  
     bProcessed=TRUE; AvwX 2?tc  
    } T|=8 jt,  
   } E;X'.7[c  
  } 's9)\LS>p  
  else if((lParam&0xc000ffff)==1){ //有键按下 sPhh#VCw{  
   switch(wParam) xOt|j4  
   { $DQMN  
    case VK_MENU:  g6~uf4;  
     MaskBits|=ALTBIT; KUp lN1Sy  
     break; :xA'X+d/'  
    case VK_CONTROL: l^SKd  
     MaskBits|=CTRLBIT; #\"5:.H Oz  
     break; mjw:Z,  
    case VK_SHIFT: ?>w%Lg{L}  
     MaskBits|=SHIFTBIT; >yaz  
     break; "{&!fD~w  
    default: //judge the key and send message ~+1t 17  
     break; J4JKAv~3  
   } Y`_6Ny="  
   for(int index=0;index<MAX_KEY;index++){ -PX {W)Aw  
    if(hCallWnd[index]==NULL) EBn7waBS  
     continue; -yC},tK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $}jSIn=~|t  
    { 6g!t1%Kb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #]Cr zLe  
     bProcessed=TRUE; ^v`|0z\  
    } +`9T?:fu  
   } p_}OtS;  
  } U>{z*D  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 | 0&~fY  
   for(int index=0;index<MAX_KEY;index++){ Xl}>mbB  
    if(hCallWnd[index]==NULL) Mbi)mybM  
     continue; lT%o6qgT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) BO1Mz=q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /6f$%:q  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 {!<zk+h$  
   } 3n,F5?! m  
  } )Z]8SED  
 } 9 Z4H5!:(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); T%:}/@  
} YUc&X^O  
qEywExdiu  
  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: :lcoSJ  
Er%nSH^"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); e\)PGjSI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tW 9vo-{+  
/Jo*O=Lpo  
  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: f):|Ad|  
O* 7" Q&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -()CgtSR  
{ AJj6@hi2P  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) p! Hpq W  
 { uv Z!3UH.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =WHdy;  
  SaveBmp(); V a<L[8  
  return FALSE; `~gyq>Ik2  
 } ] @IzJz"R  
 …… //其它处理及默认处理 \[Q,>{^  
} WJl&Vyl2FL  
ZX'/[wAN)  
1YQ|KJ*K  
  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。 @C?RbTHy  
x|1OGbBK  
  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。 uN'e~X6  
U t0oh  
  二、编程步骤 aLG6yVtu  
_O)~<Sk-*z  
  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"; dMYDB  
-cOLg rmp  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; /SjA;c! .  
{&m^*YN/  
  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; 3Ju<jXoo!  
!hEt UF  
  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; l+RBe<Mq  
(rvK@  
  5、 添加代码,编译运行程序。 1_f(;WOg  
>12phLu  
三、程序代码 `n$pR8TZ_  
LKTIwb>  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ss.wX~I  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) XB^o>/|@S  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ;QS-a  
#if _MSC_VER > 1000 4y:yFTp  
#pragma once l(*`,-pv:  
#endif // _MSC_VER > 1000 gP? pfFhG  
#ifndef __AFXWIN_H__ a! ]'S4JS  
#error include 'stdafx.h' before including this file for PCH ([^1gG+>J  
#endif +H8]5~',L%  
#include "resource.h" // main symbols 8L^5bJ  
class CHookApp : public CWinApp (xy/:i".V  
{ 'tklz*  
 public: `gx_+m^  
  CHookApp(); H W)> `  
  // Overrides pFx7URZA  
  // ClassWizard generated virtual function overrides G D$o |l]\  
  //{{AFX_VIRTUAL(CHookApp) up#W"`"  
 public: zXIVHC,"{  
  virtual BOOL InitInstance(); VPet1hAy  
  virtual int ExitInstance(); }f/ 1  
  //}}AFX_VIRTUAL !T!U@e=u  
  //{{AFX_MSG(CHookApp) MQ7N8@!t  
  // NOTE - the ClassWizard will add and remove member functions here. [}|x@ v9  
  // DO NOT EDIT what you see in these blocks of generated code ! &iORB  
  //}}AFX_MSG wL\OAM6R  
  DECLARE_MESSAGE_MAP() "@#^/m)  
}; <Y9%oJn%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); C%vR!Az  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K)QM xn  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0NL~2Qf_4  
BOOL InitHotkey(); C|*U)#3:F  
BOOL UnInit(); -c{O!z6sX  
#endif 'S;INs2|->  
 At @H  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. J>y}kzCz  
#include "stdafx.h" )[oegfnn-  
#include "hook.h" yb\T< *  
#include <windowsx.h> sIJl9  
#ifdef _DEBUG dG2k4 O  
#define new DEBUG_NEW Arc6d5Q  
#undef THIS_FILE =^\yE"a  
static char THIS_FILE[] = __FILE__; 3"FvYv{  
#endif }>]V_}h  
#define MAX_KEY 100 P%2aOsD0  
#define CTRLBIT 0x04 8iA[w-Pv  
#define ALTBIT 0x02 }OL?k/w  
#define SHIFTBIT 0x01 f#f<Ii  
#pragma data_seg("shareddata") C-u'Me)H  
HHOOK hHook =NULL; {<+B>6^  
UINT nHookCount =0; 0n<>X&X  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey E^qJ5pr_P  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT _3~/Z{z8  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey W|'7)ph  
static int KeyCount =0; @G,pM: t  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ^hiIMqY_{`  
#pragma data_seg() b~>kTO  
HINSTANCE hins; <N KmLAfX  
void VerifyWindow(); D`d*bNR  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) A#k(0e!O  
//{{AFX_MSG_MAP(CHookApp) !?)ky `S3  
// NOTE - the ClassWizard will add and remove mapping macros here. 79`OB##  
// DO NOT EDIT what you see in these blocks of generated code! >>bsr#aJ  
//}}AFX_MSG_MAP ![1+=F !  
END_MESSAGE_MAP() 'o}v{f  
P|j|0o,8p  
CHookApp::CHookApp() Cw$0XyO  
{ n/9.;9b$I  
 // TODO: add construction code here, `xv2,Z9<  
 // Place all significant initialization in InitInstance E.LD1Pm0  
} aG_@--=  
M$YU_RPl+  
CHookApp theApp; #!?jxfsFa  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H?oBax:  
{ B! +rO~  
 BOOL bProcessed=FALSE; ad)jw:n  
 if(HC_ACTION==nCode) /]pJ(FFC  
 { hQ7-m.UZw  
  if((lParam&0xc0000000)==0xc0000000){// Key up 4*Uzomb?q  
   switch(wParam) fab. %$  
   { w}|XSJ!  
    case VK_MENU: HKp|I%b]J  
     MaskBits&=~ALTBIT; qtrN=c3x  
     break; yM}~]aQ y  
    case VK_CONTROL: X<8?>#  
     MaskBits&=~CTRLBIT; `)~]3zmG  
     break; p>oC.[:4a  
    case VK_SHIFT: #ME!G/  
     MaskBits&=~SHIFTBIT; T3wQRn  
     break; \3"jW1Wb  
    default: //judge the key and send message 76::X:76  
     break; }_mVXjF  
   } _+7+90u  
   for(int index=0;index<MAX_KEY;index++){ 0Wkk$0h9  
    if(hCallWnd[index]==NULL) (1IYOlG4  
     continue; #)r^ZA&E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q HU|aC{r  
    { \<ko)I#%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); p~'iK4[&6  
     bProcessed=TRUE; >V%lA3  
    } 6;:z?Q  
   } \1Xr4H u  
  } Yyxsj9  
  else if((lParam&0xc000ffff)==1){ //Key down zEVQ[y6BcM  
   switch(wParam) zsM2R"[X  
   { %8O1sF  
    case VK_MENU: W{RZ@ 3ZY  
     MaskBits|=ALTBIT; HOaNhJ{7D  
     break; J tvZ~s  
    case VK_CONTROL: #7Fdmnu`  
     MaskBits|=CTRLBIT; ^%n]_[RUn4  
     break; =fRC$  
    case VK_SHIFT: ObPXVqG"?  
     MaskBits|=SHIFTBIT; &=^YN"=Z  
     break; pKtN$Fd  
    default: //judge the key and send message J8'1 ~$6  
     break; ?kIyo  
   } "hmLe(jo}  
   for(int index=0;index<MAX_KEY;index++) '@/1e\-y  
   { -1{f(/  
    if(hCallWnd[index]==NULL) 'Z*`~,Q  
     continue; +0ALO%G;G"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _`I}"`2H  
    { *z'v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); WKAG)4  
     bProcessed=TRUE; T>hrKn.!D:  
    } aPdEEqc\l  
   } {j6$'v)0  
  } <78*-Ob  
  if(!bProcessed){ 5jq @ nq6  
   for(int index=0;index<MAX_KEY;index++){ A` ~R\j  
    if(hCallWnd[index]==NULL) ?6W v["%  
     continue; q4ttmL8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) R-Ys<;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Q7.jSL6  
   } 2YDD`:R  
  } x2,;ar\D  
 } h2-v.Tjf  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }_Ci3|G>%D  
} 6:~<L!`&  
Sse%~:FL  
BOOL InitHotkey() 7@&mGUALO  
{ 9^u}~e #(  
 if(hHook!=NULL){  J8-K  
  nHookCount++; 7W'&v+\  
  return TRUE; `?{6L#  
 } q`'m:{8  
 else cQkj{u  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); )K8 ^}L,  
  if(hHook!=NULL) +Wl]1 c/  
   nHookCount++; CcTdLq  
  return (hHook!=NULL); :7M%/#Fy  
} l 88n*O  
BOOL UnInit() p()q)P  
{ H_ a##z  
 if(nHookCount>1){ M"Af_Pbx  
  nHookCount--; u6 QW*8b4  
  return TRUE; 4.Q[Tu  
 } <.#jp([W>  
 BOOL unhooked = UnhookWindowsHookEx(hHook); \gu8 ~zK  
 if(unhooked==TRUE){ H:EK&$sU  
  nHookCount=0; w&@zJ[  
  hHook=NULL; xM=ydRu  
 } E-%$1=;  
 return unhooked; R$ !]z(  
} [+d~He  
4{Q$^wD+.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W__Y^\ ~  
{  ,)uW`7  
 BOOL bAdded=FALSE; *LMzq9n3o  
 for(int index=0;index<MAX_KEY;index++){ r$v \\^?2  
  if(hCallWnd[index]==0){ Wks zN h  
   hCallWnd[index]=hWnd; ]x).C[^  
   HotKey[index]=cKey; ce;$)Ff\  
   HotKeyMask[index]=cMask; ^OV!Q\j.q  
   bAdded=TRUE; lN&+<>a  
   KeyCount++; >z~_s6#CP  
   break; `ZZ3!$czR  
  } p$G3<Z&7  
 } _Ss}dU9  
 return bAdded; )Tieef*Q~  
} k.7!)jL7  
VDro(?p8Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y #C9@C  
{ H,W8JNPs  
 BOOL bRemoved=FALSE; zB`J+r;LU  
 for(int index=0;index<MAX_KEY;index++){ pP#D*hiP-g  
  if(hCallWnd[index]==hWnd){ /Xj{]i3{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k( Ik+=u  
    hCallWnd[index]=NULL; h oO847  
    HotKey[index]=0; Ml9m#c  
    HotKeyMask[index]=0; ,{\Ae"{6  
    bRemoved=TRUE; aS[y\9(**  
    KeyCount--; ck%.D%=  
    break; xbxzB<yL  
   } {Mj- $G"  
  } KwV!smi2  
 } }9^'etD  
 return bRemoved; M)ao}m>  
} r;)31Tg  
#eN2{G=4+  
void VerifyWindow() IhBQ1,&J  
{ bHcBjk.\  
 for(int i=0;i<MAX_KEY;i++){ 1;KJUf[N  
  if(hCallWnd!=NULL){ $0x+b!_l@  
   if(!IsWindow(hCallWnd)){ *P5\T4!+d  
    hCallWnd=NULL; O8A(OfX  
    HotKey=0; (, ik:j  
    HotKeyMask=0; V;g) P  
    KeyCount--; -+u}u=z%  
   } =>lX brJ  
  } ; wxmSX9  
 } |'&$VzA  
} ,}khu  
 3Z`"k2k  
BOOL CHookApp::InitInstance() ]%I\FefT  
{ #?+[|RS|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); FZ}^)u}o  
 hins=AfxGetInstanceHandle(); K2e68GU  
 InitHotkey(); ]'7Au]Us`  
 return CWinApp::InitInstance(); E|>-7k")  
}   NV-l9  
WO{7/h</  
int CHookApp::ExitInstance() pouXt-%2X  
{ q.<)0nk  
 VerifyWindow(); /P-#y@I  
 UnInit(); 9D &vxKE  
 return CWinApp::ExitInstance(); *5 9|  
} */JYP +  
z.\r7  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file _;0RW  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) CS(XN>N  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 6FJ*eWPC  
#if _MSC_VER > 1000 ,\X ! :y~  
#pragma once 2z" <m2 a  
#endif // _MSC_VER > 1000 q5S_B]|  
{ `Z~T&}~T  
class CCaptureDlg : public CDialog mR1b.$  
{ )A%* l9\nG  
 // Construction IiRQ-,t1  
 public: sV-P R]  
  BOOL bTray; $T#fCx/  
  BOOL bRegistered; 5-ED\-  
  BOOL RegisterHotkey(); {tl{ j1d |  
  UCHAR cKey; _ yJz:pa  
  UCHAR cMask; ?<BI)[B  
  void DeleteIcon(); %'i_iF8.  
  void AddIcon(); _&\'Va$  
  UINT nCount; QcX\z\'vg  
  void SaveBmp(); s3m \  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor |c8\alw  
  // Dialog Data +c!HXX  
  //{{AFX_DATA(CCaptureDlg) SPRTJdaC9  
  enum { IDD = IDD_CAPTURE_DIALOG }; L C##em=Y  
  CComboBox m_Key; J)y g<*/3  
  BOOL m_bControl; 2}XRqa.|  
  BOOL m_bAlt; 8m=R" %h  
  BOOL m_bShift; [ `1` E1X  
  CString m_Path; }aVzr}!  
  CString m_Number; T@{ab1KV  
  //}}AFX_DATA Y'm;xA  
  // ClassWizard generated virtual function overrides ]\ !ka/%  
  //{{AFX_VIRTUAL(CCaptureDlg) /*>}y$  
 public: YmFg#eS  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9xj }<WM  
 protected: g 8uq6U  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iZiT/#,H2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); EI*~VFx  
  //}}AFX_VIRTUAL P qC#[0Qy  
  // Implementation +jZa A/  
 protected: ;,6C&|n]w  
  HICON m_hIcon; d/F^ez  
  // Generated message map functions m,t{D, 2  
  //{{AFX_MSG(CCaptureDlg) j;b>~_ U%  
  virtual BOOL OnInitDialog(); ~E((n  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _aOs8#(X  
  afx_msg void OnPaint(); ^'`(E_2u  
  afx_msg HCURSOR OnQueryDragIcon(); i!8"T#  
  virtual void OnCancel(); ME0u|_dPjz  
  afx_msg void OnAbout(); )=()  
  afx_msg void OnBrowse(); @VW1^{.do^  
  afx_msg void OnChange(); AZ4?N.X?  
 //}}AFX_MSG 7gV9m9#  
 DECLARE_MESSAGE_MAP() -C(Yl=  
}; $:oC\K6  
#endif MZX)znO  
0&fO)de96  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file yA"?Hv\o;  
#include "stdafx.h" )D#}/3s  
#include "Capture.h" 6{^\7`  
#include "CaptureDlg.h" P (7Q8i'  
#include <windowsx.h> 4U}J?EB?K  
#pragma comment(lib,"hook.lib") (0#$%US\  
#ifdef _DEBUG !~%DR~^`  
#define new DEBUG_NEW 4Eu'_>"a  
#undef THIS_FILE z8'zH>  
static char THIS_FILE[] = __FILE__; q78OP}  
#endif o+x! (  
#define IDM_SHELL WM_USER+1 ggrYf*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "OYD9Q''  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |>xuH#Q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ~+0IFJ`}  
class CAboutDlg : public CDialog #_S]\=N(  
{ 2[3t7C  
 public:  QtG6v<A  
  CAboutDlg(); ps:`rVQ7  
  // Dialog Data 13Z,;YW  
  //{{AFX_DATA(CAboutDlg) HyWR&0J  
  enum { IDD = IDD_ABOUTBOX }; '" %0UflJS  
  //}}AFX_DATA <`=Kt[_BQ  
  // ClassWizard generated virtual function overrides VVAcbAGJ  
  //{{AFX_VIRTUAL(CAboutDlg) HBvyX`-  
 protected: -Z:x!M[Xr  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support QN$s %&O  
  //}}AFX_VIRTUAL <'$>&^!^  
  // Implementation 7]1a3Jk  
 protected: !*~QB4\2b  
  //{{AFX_MSG(CAboutDlg) hx;kNcPbI  
  //}}AFX_MSG i.W*Go+  
  DECLARE_MESSAGE_MAP() gl`J(  
}; o$;&q *  
3{~(_  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) W/,:-R&'>  
{ r9N?z2X  
 //{{AFX_DATA_INIT(CAboutDlg) Cj4Y, N  
 //}}AFX_DATA_INIT k Qr  
} kO*\JaD  
'6){~ee S  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6Y\TVRR  
{ W).Kq-  
 CDialog::DoDataExchange(pDX); '{.4~:  
 //{{AFX_DATA_MAP(CAboutDlg) 4.wrY6+V  
 //}}AFX_DATA_MAP X)iI]   
} #"!ga)a%L  
Q <D_QJ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 56c[$ q  
 //{{AFX_MSG_MAP(CAboutDlg) 5vR])T/S0  
 // No message handlers z&9MkbH1  
 //}}AFX_MSG_MAP O.QR1  
END_MESSAGE_MAP() `W@jo~ y<  
X\H P{$fY_  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Rzs u 7w  
: CDialog(CCaptureDlg::IDD, pParent) j0~c2  
{ \6/ Gy!0h-  
 //{{AFX_DATA_INIT(CCaptureDlg) fgj$ u  
  m_bControl = FALSE; /0gr?I1wr7  
  m_bAlt = FALSE; Yl'8" \HF  
  m_bShift = FALSE; Dzu//_u  
  m_Path = _T("c:\\"); BH~zeJ*Pr  
  m_Number = _T("0 picture captured."); r0[<[jEh  
  nCount=0; 8N"WKBj|_d  
  bRegistered=FALSE; \MmOI<Hd-  
  bTray=FALSE; eHs38X  
 //}}AFX_DATA_INIT T{^mh(3/"  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R+K|K2"  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); S& IW]ffK  
} \ILNx^$EL  
xYv;l\20.  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) e_3jyA@v  
{ ;8&/JSN M  
 CDialog::DoDataExchange(pDX); .xT{Rz  
 //{{AFX_DATA_MAP(CCaptureDlg) P/[RH e  
  DDX_Control(pDX, IDC_KEY, m_Key); `@1e{ ?$  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); KGc.YUoE  
  DDX_Check(pDX, IDC_ALT, m_bAlt); J %A=  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); u1UCe  
  DDX_Text(pDX, IDC_PATH, m_Path); (n>Gi;u(R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); p9 ,[kb  
 //}}AFX_DATA_MAP 5RWqHPw+  
} XY? Cl  
fB7Jx6   
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) MS#*3Md&y  
//{{AFX_MSG_MAP(CCaptureDlg) VO {z)_  
 ON_WM_SYSCOMMAND() oGI'a:iff  
 ON_WM_PAINT() z^tzP~nI  
 ON_WM_QUERYDRAGICON() T*#M'H7LSQ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) )i:*r8*~  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) U*yOe*>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) QP50.P5g  
//}}AFX_MSG_MAP dwUDhQt3Q  
END_MESSAGE_MAP() (j@c946z""  
H}G 9gi  
BOOL CCaptureDlg::OnInitDialog() :8/ 6dx@Y(  
{ rX5"p!z  
 CDialog::OnInitDialog(); }vY^e OK.  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,\&r\!=  
 ASSERT(IDM_ABOUTBOX < 0xF000); z3L=K9)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =ca[*0^Z7  
 if (pSysMenu != NULL) ~&ns?z>x  
 { /E\04Bs  
  CString strAboutMenu; (*6 .-Xn  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 2-Q5l*  
  if (!strAboutMenu.IsEmpty()) zd$?2y8  
  { Hu6Qr  
   pSysMenu->AppendMenu(MF_SEPARATOR); . IY@Q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ey9hrRMR  
  } mP6}$ D  
 } 5+oY c-  
 SetIcon(m_hIcon, TRUE); // Set big icon 8:S+*J[gSn  
 SetIcon(m_hIcon, FALSE); // Set small icon {t! &x:  
 m_Key.SetCurSel(0); V;CRs\aYf  
 RegisterHotkey(); "mE/t  (  
 CMenu* pMenu=GetSystemMenu(FALSE); i!UT =  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); kjsj~jwvv  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8Ara^Xh}q  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); v9 /37AU  
 return TRUE; // return TRUE unless you set the focus to a control .L%pWRxA[  
} ,38M6yD  
QbSLSMoL  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) acUyz2x  
{ "m6G;cv  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) mDv<d=p!  
 { @f|~$$k=  
  CAboutDlg dlgAbout; L ..  
  dlgAbout.DoModal(); ~J~R.r/  
 } ?F$#t6Q  
 else G;wh).jG5  
 { N Czabl  
  CDialog::OnSysCommand(nID, lParam); #tsP  
 } w;Fy/XQ  
} _!,2"dS  
XHKLl?-  
void CCaptureDlg::OnPaint() z ULH gG  
{ PcZ<JJ16F$  
 if (IsIconic()) |unvDXx-  
 { ,/V~T<FI  
  CPaintDC dc(this); // device context for painting pnx^a}|px  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); adri02C/  
  // Center icon in client rectangle H<ovIMd  
  int cxIcon = GetSystemMetrics(SM_CXICON); lg )xQV  
  int cyIcon = GetSystemMetrics(SM_CYICON); WEG!;XZ  
  CRect rect; UfO='&U^  
  GetClientRect(&rect); &#u\@Qze  
  int x = (rect.Width() - cxIcon + 1) / 2; ALO/{:l(  
  int y = (rect.Height() - cyIcon + 1) / 2; ^jS1g*nrN  
  // Draw the icon u^^jt(j  
  dc.DrawIcon(x, y, m_hIcon); `.pd %\  
 } nwfu@h0G  
 else 0(u}z  
 { %q;y74  
  CDialog::OnPaint(); V(LfFO{^>?  
 } ZR|s]'  
} :?z @T[-  
W]bytsl  
HCURSOR CCaptureDlg::OnQueryDragIcon() AEWrrE  
{ D(|+z-}M  
 return (HCURSOR) m_hIcon; N`H`\+  
} <Tbl |9  
p^w)@^f  
void CCaptureDlg::OnCancel() rbv  
{ J~`!@!  
 if(bTray) jJvd!,=)  
  DeleteIcon(); D_ej%QtB@  
  CDialog::OnCancel(); )`Qr=DIsW  
} /GJL&RMx  
p(4B"[!S  
void CCaptureDlg::OnAbout() `<T4 En  
{ doX`NbA  
 CAboutDlg dlg; C-,#t5eir  
 dlg.DoModal(); NgsEEPu?  
} ,SdxIhL  
*'M+oi  
void CCaptureDlg::OnBrowse() v&9:Wd*Iz'  
{ Z RwN#?x  
 CString str; x+%> 2qgj"  
 BROWSEINFO bi; NaQ~iY?  
 char name[MAX_PATH]; OaoHN& "  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); *Ev8f11i&  
 bi.hwndOwner=GetSafeHwnd(); +5R8mbD!  
 bi.pszDisplayName=name; kDRxu!/  
 bi.lpszTitle="Select folder"; gwB0/$!4"  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 1_9Ka V  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #ifjQ7(:  
 if(idl==NULL) wNFx1u^/)  
  return; >OjK0jiPf  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]JmE(Y1(1  
 str.ReleaseBuffer(); I`g&>  
 m_Path=str; Q=[ IO,f  
 if(str.GetAt(str.GetLength()-1)!='\\') HKOSS-`5  
  m_Path+="\\"; 2t?>0)*m  
 UpdateData(FALSE); g.8^ )u  
}  =mcQe^M  
n >E1\($  
void CCaptureDlg::SaveBmp() *N{k#d/  
{ u!It' ;j  
 CDC dc; { Ngut  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); pxyFM@Z](  
 CBitmap bm; Ho&f[T(  
 int Width=GetSystemMetrics(SM_CXSCREEN); S @!z'$&  
 int Height=GetSystemMetrics(SM_CYSCREEN); aDLlL?r3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); j2:9ahW  
 CDC tdc; ?wIEXKI  
 tdc.CreateCompatibleDC(&dc); s6;ZaU  
 CBitmap*pOld=tdc.SelectObject(&bm); tdu:imH~  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); A+\rGVNH'S  
 tdc.SelectObject(pOld); n1R{[\ >1  
 BITMAP btm; S&cN+r  
 bm.GetBitmap(&btm); 5yV>-XT+-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; mQU t 'j4  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .]<iRf[\[  
 BITMAPINFOHEADER bih; Gcxz$.(  
 bih.biBitCount=btm.bmBitsPixel; M#8_Qbvfk  
 bih.biClrImportant=0; JH2-'  
 bih.biClrUsed=0; ]D2 d=\  
 bih.biCompression=0; $|!3ks  
 bih.biHeight=btm.bmHeight; HG5E,^1n  
 bih.biPlanes=1; *|L;&XM&/  
 bih.biSize=sizeof(BITMAPINFOHEADER); dIQ3snG  
 bih.biSizeImage=size; bG.`>   
 bih.biWidth=btm.bmWidth; K^b'<} $|p  
 bih.biXPelsPerMeter=0; { Rxb_9  
 bih.biYPelsPerMeter=0; v`7~#Avhz  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ~ `{{Z&  
 static int filecount=0; {=3'H?$  
 CString name; !{g>g%2!  
 name.Format("pict%04d.bmp",filecount++); =XSupM[T  
 name=m_Path+name; -B7X;{  
 BITMAPFILEHEADER bfh; #&K}w 0}k  
 bfh.bfReserved1=bfh.bfReserved2=0; &t6SI'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); (CYQ>)a  
 bfh.bfSize=54+size; E( *CEW.V*  
 bfh.bfOffBits=54; v806f8  
 CFile bf; \vL{f;2J  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !L)|N<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _4k zlD  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @lh]? |*[  
  bf.WriteHuge(lpData,size); Y31e1   
  bf.Close(); >oAXS\Ts  
  nCount++; Q+U" %   
 } SU~ljAF4  
 GlobalFreePtr(lpData); {G|= pM\'  
 if(nCount==1) H:16aaMn(  
  m_Number.Format("%d picture captured.",nCount); .NF3dC\  
 else { "f} }}l  
  m_Number.Format("%d pictures captured.",nCount); >4=7t&h  
  UpdateData(FALSE); wo86C[  
} W<~u0AyO 3  
y;.5AvfD  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $ 93j;  
{ A5ckosYyNA  
 if(pMsg -> message == WM_KEYDOWN) /}d)g4\j  
 { H$zDk  
  if(pMsg -> wParam == VK_ESCAPE) =%[vHQ\%  
   return TRUE; ehMpo BL  
  if(pMsg -> wParam == VK_RETURN) 4/2@^\?i)  
   return TRUE; 99~-TiU  
 } )fke;Y0  
 return CDialog::PreTranslateMessage(pMsg); j4#S/:Q<7  
} qUQP.4Z95  
a5`9mR)Y$'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p%\&M bA  
{ eFQz G+/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ uxW<Eh4H*  
  SaveBmp(); )@ .0ai  
  return FALSE; OeQ~g-n  
} j#H&~f  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ S09Xe_q  
 CMenu pop; `n`HwDo;i  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); axkNy}ct  
 CMenu*pMenu=pop.GetSubMenu(0); NV2$ >D  
 pMenu->SetDefaultItem(ID_EXITICON); OuPfB  
 CPoint pt; 5N2`e3:I  
 GetCursorPos(&pt); M^/ZpKeT"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 5^2P\y(?  
 if(id==ID_EXITICON) H" pwIiC  
  DeleteIcon(); %e/L .#0  
 else if(id==ID_EXIT) _+0c<'  
  OnCancel(); `;s#/`c|/  
 return FALSE; o4B%TW  
} CL!s #w1I\  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0y;1D k!  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) reNUIDt/c  
 AddIcon(); !F$o$iq  
 return res; 92/_!P>  
} G8b`>@rZ  
?ViU%t8J5  
void CCaptureDlg::AddIcon() 'FG@Rg (  
{ `] Zil8n  
 NOTIFYICONDATA data; *!}bU`  
 data.cbSize=sizeof(NOTIFYICONDATA); ;x u&%n[6@  
 CString tip; A=wh&X  
 tip.LoadString(IDS_ICONTIP); msZ 3%L  
 data.hIcon=GetIcon(0); ~8lB#NuN  
 data.hWnd=GetSafeHwnd(); m{ rsjdnA  
 strcpy(data.szTip,tip); W3B:)<f  
 data.uCallbackMessage=IDM_SHELL; p$XvVzW#<  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0P4g6t}e  
 data.uID=98; N8{ 8 a  
 Shell_NotifyIcon(NIM_ADD,&data); )gxZ &n6  
 ShowWindow(SW_HIDE); 9u_D@A"aC`  
 bTray=TRUE; G4n-}R&'  
} ebf/cC h  
F||oSJrI  
void CCaptureDlg::DeleteIcon() c&#B1NN<  
{ -&LF`V&3w  
 NOTIFYICONDATA data; uNvdlY]  
 data.cbSize=sizeof(NOTIFYICONDATA); 8iUKG  
 data.hWnd=GetSafeHwnd(); R& HkWe  
 data.uID=98; }Q;^C  
 Shell_NotifyIcon(NIM_DELETE,&data);  ByjgM`  
 ShowWindow(SW_SHOW); iz6+jHu'l  
 SetForegroundWindow(); /t _QA  
 ShowWindow(SW_SHOWNORMAL); [T2!,D.  
 bTray=FALSE; F<2qwP  
} i#Z#(D `m  
f"G-',O<  
void CCaptureDlg::OnChange() AhNz[A  
{ Ap<j;s4`  
 RegisterHotkey(); Ce@"+k+w  
} poS=8mN8;  
;fm> \f  
BOOL CCaptureDlg::RegisterHotkey() @`rC2-V  
{ uVZX53 ,g  
 UpdateData(); jG/@kh*m  
 UCHAR mask=0; zIc_'Z,b  
 UCHAR key=0; EzXi*/  
 if(m_bControl) |I=GI]I  
  mask|=4; 7n'Ww=ttI  
 if(m_bAlt) %u*HNo  
  mask|=2; G~zP&9N|  
 if(m_bShift) )1Z @}o 9  
  mask|=1; Vx=tP.BO]  
  key=Key_Table[m_Key.GetCurSel()]; qfgw^2aUa  
 if(bRegistered){ wF{M"$am  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); fa(-&;q  
  bRegistered=FALSE; nm@.] "/  
 } j k/-7/r  
 cMask=mask; 249DAjn+  
 cKey=key; 3\a VZx!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Qs8Rb]%|  
 return bRegistered; b'(Hwc\ t  
} #UqE %g`J  
2;ac&j1  
  四、小结 &MJ`rj[%  
J!5&Nc  
  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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