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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: VII`qbxT  
  @lB1t= D  
  一、实现方法 Nt+UL/1]  
R7Tl 1!,h  
  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: fo}@B &=4  
N0fE*xo  
#pragma data_seg("shareddata") ed,+Slg  
HHOOK hHook =NULL; //钩子句柄 ,,XHw;{  
UINT nHookCount =0; //挂接的程序数目 1slt[&4N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Y\!:/h]E&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 "~C \Z} ;  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey |RpZr!3V  
static int KeyCount =0; qyyLU@hd  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 i_6wD  
#pragma data_seg() 8Pom^QopK  
(`n*d3  
  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。 tSDp>0yZ3  
E3Z>R=s  
  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: -NG9?sI\U  
=L$RY2S"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR "z.!h(Eq  
cKey,UCHAR cMask) y^p%/p%  
{ @Ng q+uXm  
 BOOL bAdded=FALSE; j@Us7Q)A(  
 for(int index=0;index<MAX_KEY;index++){ nkkGJV!  
  if(hCallWnd[index]==0){ suj}A  
   hCallWnd[index]=hWnd; jaThS!>v  
   HotKey[index]=cKey; t[%=[pJHW  
   HotKeyMask[index]=cMask; QL(}k)dB  
   bAdded=TRUE; `).;W  
   KeyCount++; 0txSF^x  
   break; y(#F&^|  
  } HSl$ U0  
 } ]*S_fme  
 return bAdded; uuh vd h=  
} 8DrKq]&  
//删除热键 (aCl*vV1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J! eVw\6  
{ nfvs"B;  
 BOOL bRemoved=FALSE; I^ A01\p  
 for(int index=0;index<MAX_KEY;index++){ ;rta#pRn  
  if(hCallWnd[index]==hWnd){ FHH2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ = &aD!nTx  
    hCallWnd[index]=NULL; .+AO3~Dg  
    HotKey[index]=0; ldoN!J  
    HotKeyMask[index]=0; ~w%Z Bp  
    bRemoved=TRUE; ,v1-y ?kB  
    KeyCount--; _jb"@TY  
    break; J2#=`|t"  
   } 13{"sY:PT#  
  } {&(bKQ  
 } ]O&A:Us  
 return bRemoved; Ip0@Q}^  
} ;v+CQx  
OEGAwP?F  
oB Bdk@  
  DLL中的钩子函数如下: 5p{tt;9[  
s: q15"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) m9>nv rQ  
{ qXW2a'~  
 BOOL bProcessed=FALSE; 2|w.A!  
 if(HC_ACTION==nCode) u&I~%s  
 { ~(0Y`+gC  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 j'0*|f^z  
   switch(wParam) /0YNB)  
   {  Q+ST8  
    case VK_MENU: KF-gcRh  
     MaskBits&=~ALTBIT; XY QUU0R  
     break; <ct{D|mm  
    case VK_CONTROL: U14dQ=~b/  
     MaskBits&=~CTRLBIT; Z*e7W O.  
     break; 1@qb.9wZ6  
    case VK_SHIFT: 7iJk0L$]x  
     MaskBits&=~SHIFTBIT; .r*b+rc;]  
     break; U ._1'pW  
    default: //judge the key and send message M[*:=C)H  
     break; 01q7n`o#zf  
   } @%cJjZ5y  
   for(int index=0;index<MAX_KEY;index++){ "RX?"pB  
    if(hCallWnd[index]==NULL) {}^ELw  
     continue; x!.VWGtb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  FZ2-e  
    { (&hX8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); qK1V!a2  
     bProcessed=TRUE; (1} Ndo^;w  
    } ?h3Ow`1G  
   } m<f{7]fi5  
  } ;qk~>  
  else if((lParam&0xc000ffff)==1){ //有键按下 FW.dHvNX  
   switch(wParam) Q#r 0DWo\  
   { /eMZTh*1P  
    case VK_MENU: o%9>elOju  
     MaskBits|=ALTBIT; xNqQbk F  
     break; ft6^s(t  
    case VK_CONTROL: pn7 :")Zx  
     MaskBits|=CTRLBIT; yEqmB4^-  
     break; X5/{Mx`8Oz  
    case VK_SHIFT: y?@Y\ b  
     MaskBits|=SHIFTBIT; I~qiF%?d  
     break; \j;uN#)28  
    default: //judge the key and send message G-(c+6Mn  
     break; R39R$\  
   } t(rU6miN  
   for(int index=0;index<MAX_KEY;index++){ "=n8PNV/ c  
    if(hCallWnd[index]==NULL) _TXV{<E6  
     continue; 9iy|=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) G\p; bUF  
    { .- Lqo=o\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8W[]#~77b  
     bProcessed=TRUE; 1;gSf.naG  
    } 7Mv$.Z(  
   } VfcQibm  
  } )IhY&?jk?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 c-=0l)&'D=  
   for(int index=0;index<MAX_KEY;index++){ +=k|(8Js#  
    if(hCallWnd[index]==NULL) uRy6~'  
     continue; GKtQ>39B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LG|,g3&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); L-R}O 8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 qU n>  
   } Wu&Di8GhP  
  } y4L9Cxvs  
 } K)@}Ok"#\4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A,e^bM  
} `x VA]GR4c  
\veL5  
  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: dZgfls  
4"{wga~%/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %nh'F6bNgv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); urB3  
P[K=']c  
  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: 8!SiTOzR?  
B ,Brmn  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ix+x-G  
{ xlO2jSSAt  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) <6~;-ZQY  
 { \pGO}{3 e*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 uCfp+  
  SaveBmp(); $@k w>2  
  return FALSE; [ d7]&i}*|  
 } <pUou  
 …… //其它处理及默认处理 <;e#"(7  
} XE*bRTEw  
*^Y0}?]qT  
|=T<WU1$  
  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。 `=DCX%Vw  
8|NJ(D-$  
  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。 "%t`I)  
r_E)HL/A  
  二、编程步骤 U.'@S8  
n;`L5  
  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"; 5z ^UQ q  
9%14k  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~{G: ,|`  
F5MPy[  
  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; 9lJj/  
\=_q{  
  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; ^(*O$N*#  
)6 <byO  
  5、 添加代码,编译运行程序。 !cwVJe  
3og$'#6P  
三、程序代码 a3O_#l-Z  
u/'sdt  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _ng =5  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) C}'="g^=sl  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Ef!p:HBJ  
#if _MSC_VER > 1000 gdE`UZ\  
#pragma once >1G*ya)  
#endif // _MSC_VER > 1000 p30&JJ!~"  
#ifndef __AFXWIN_H__ /t)c fFM  
#error include 'stdafx.h' before including this file for PCH ~"2@A F  
#endif ~!9Px j*  
#include "resource.h" // main symbols yGG B  
class CHookApp : public CWinApp p3FnYz-V  
{ vcO`j<`  
 public: \N , '+  
  CHookApp(); 8Vhck-wF  
  // Overrides X6GkJ R  
  // ClassWizard generated virtual function overrides +JS/Z5dl+}  
  //{{AFX_VIRTUAL(CHookApp) 6n\z53Mk  
 public: A'QGTT  
  virtual BOOL InitInstance(); Wx)U<:^e  
  virtual int ExitInstance(); fR%1FXpK&  
  //}}AFX_VIRTUAL qK vr*xlC  
  //{{AFX_MSG(CHookApp) hUvuq,LH_  
  // NOTE - the ClassWizard will add and remove member functions here. 3;S`<  
  // DO NOT EDIT what you see in these blocks of generated code ! ?VP!1O=J  
  //}}AFX_MSG yL x .#kx6  
  DECLARE_MESSAGE_MAP() vSC0D7BlG  
}; OrEuQ-,i@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); k5;Vl0Ho  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); KI@    
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xf"5<PTW</  
BOOL InitHotkey(); E+ 3yN\X(  
BOOL UnInit(); Df:7P>  
#endif A a} o*  
uoY`qF.`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _pko]F|()  
#include "stdafx.h" Vy^yV|`v  
#include "hook.h" 3u0<v%Qi  
#include <windowsx.h> /dJ)TW(Ir  
#ifdef _DEBUG #t2UPLO~  
#define new DEBUG_NEW ]ZzG!7  
#undef THIS_FILE q6JW@GT  
static char THIS_FILE[] = __FILE__; Xu94v{u3  
#endif Z<|_+7T  
#define MAX_KEY 100 Iei7!KLW  
#define CTRLBIT 0x04 wEnuUC4j  
#define ALTBIT 0x02 =ch Af=  
#define SHIFTBIT 0x01 ~K-*q{6Q  
#pragma data_seg("shareddata") m_!vIUOz  
HHOOK hHook =NULL; Jp3di&x  
UINT nHookCount =0; &M3ES}6  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey H]$=*(aje  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  +iH30v  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Jhsv2,8 {  
static int KeyCount =0; ca/o#9:N`:  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift yaRcBT?  
#pragma data_seg() !\#Wk0Ku  
HINSTANCE hins; %:w% o$  
void VerifyWindow(); "4ozlWx  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) "vOfAo]`  
//{{AFX_MSG_MAP(CHookApp) `,Y[Z  
// NOTE - the ClassWizard will add and remove mapping macros here. 0YpiHoM  
// DO NOT EDIT what you see in these blocks of generated code! Yl&tkSw46  
//}}AFX_MSG_MAP FfxX)p1t  
END_MESSAGE_MAP() IFrb}yH  
GtM( Y  
CHookApp::CHookApp() 7}'A)C>J;  
{ od}EM_  
 // TODO: add construction code here, vf'cx:m  
 // Place all significant initialization in InitInstance OVUs]uK  
} {nQ)4.e6  
S}w.#tyEn  
CHookApp theApp; @bW[J  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) v-;XyVx  
{ \%Ah^U)gS  
 BOOL bProcessed=FALSE; =qp}p'BYe  
 if(HC_ACTION==nCode) lQdnL.w$.4  
 { 6/mkJj+"  
  if((lParam&0xc0000000)==0xc0000000){// Key up |ON&._`LH  
   switch(wParam) i,'Ka[6   
   { O| 1f^_S/  
    case VK_MENU: xdL/0 N3  
     MaskBits&=~ALTBIT; 50`iCD  
     break; EO].qN-8  
    case VK_CONTROL: X$-b oe?  
     MaskBits&=~CTRLBIT; "s>fV9YyZ  
     break; 2fzKdkJhe  
    case VK_SHIFT: %R5Com  
     MaskBits&=~SHIFTBIT; fys5-1@-p  
     break; y^ X\^Kq  
    default: //judge the key and send message XJmFJafQD  
     break; &gA6+b'  
   } 29Z!p2{hk  
   for(int index=0;index<MAX_KEY;index++){ 3"'# |6O9  
    if(hCallWnd[index]==NULL) bvip bf[m<  
     continue; nxyjL)!)0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /i{tS`[F2a  
    { ~IlF*Zz#}6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :vYt Mp  
     bProcessed=TRUE; >,>;)B@J  
    } aJ6#=G61l  
   } s-C!uq  
  } kUn2RZ6$#  
  else if((lParam&0xc000ffff)==1){ //Key down llHc=&y#  
   switch(wParam) .Na&I)udX.  
   { S9HBr  
    case VK_MENU: -}Cc"qm  
     MaskBits|=ALTBIT; }z%OnP  
     break; selP=Q!  
    case VK_CONTROL: rb:<N%*t  
     MaskBits|=CTRLBIT; 1KTabj/C  
     break; @PPR$4  
    case VK_SHIFT: a{]g+tGH  
     MaskBits|=SHIFTBIT; l_c^ .D  
     break; "WYA  
    default: //judge the key and send message v)@,:u)  
     break; Pqy-gWOv  
   } N>d|A]zH  
   for(int index=0;index<MAX_KEY;index++) ,4H;P/xsb  
   { i1qS ns  
    if(hCallWnd[index]==NULL) Jo{ zy  
     continue; mb0n}I_AC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ky[bX  
    { T!l mO?Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [3j$ 4rP  
     bProcessed=TRUE; [ 8F \;  
    } LkJ$aW/  
   } T&1-eq>l  
  } ]u rK$   
  if(!bProcessed){ 2#z=z d  
   for(int index=0;index<MAX_KEY;index++){ Qm.z@DwFM{  
    if(hCallWnd[index]==NULL) ;W7hc!  
     continue; mi7sBA9L8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) l^k+E-w\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Mjb 1  
   } / <JY:1|  
  } 5oz>1  
 } ow2M,KU6Z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6xQ"bFm  
} sA/,+aM  
[O^}rUqq  
BOOL InitHotkey() 0TTIaa$  
{ CE~r4  
 if(hHook!=NULL){ f%2%T'Q  
  nHookCount++; hzaLx8L  
  return TRUE; 9;=q=O/  
 } U r^YG4(  
 else  bt;lq!g  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); fd4;mc1T  
  if(hHook!=NULL) /@&(P#h  
   nHookCount++; `$J'UXtGc  
  return (hHook!=NULL); /^w"' '  
} I+0c8T(:  
BOOL UnInit() mT96 ]V \  
{ eh$G.-2N  
 if(nHookCount>1){ XjX 2[*l  
  nHookCount--; +.w[6  
  return TRUE; @. "q  
 } c#=&!FRe  
 BOOL unhooked = UnhookWindowsHookEx(hHook); X(IyvfC  
 if(unhooked==TRUE){ D899gGe  
  nHookCount=0; 43KaL(  
  hHook=NULL; +Dv7:x7  
 } e\`wlaP,  
 return unhooked; z~F37]W3[  
} p` $fTgm  
Jf2e<?`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I?^aCnU  
{ &a.']!$^"  
 BOOL bAdded=FALSE; !?jK1{E3  
 for(int index=0;index<MAX_KEY;index++){ +<&E3Or  
  if(hCallWnd[index]==0){ nt7|f,_J  
   hCallWnd[index]=hWnd; ;:P7}v fz!  
   HotKey[index]=cKey; >GgE,h  
   HotKeyMask[index]=cMask; R0{Qy*YQ`  
   bAdded=TRUE; !6lOIgn  
   KeyCount++; ^D>fis  
   break; ]*0(-@  
  } 19'5Re&  
 } +6 ho)YL  
 return bAdded; U<Vy>gIC  
} X1Qr _o-BR  
ThtMRB)9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6_WmCtvF  
{ 7m\vRMK  
 BOOL bRemoved=FALSE; -!l^]MU  
 for(int index=0;index<MAX_KEY;index++){ L ${m/@9  
  if(hCallWnd[index]==hWnd){ :WVSJ,. !  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ OZ=Cp$  
    hCallWnd[index]=NULL; f_rp<R>Uu  
    HotKey[index]=0; 6Z Xu,ks}  
    HotKeyMask[index]=0; x.ba|:5  
    bRemoved=TRUE; hqL+_| DW  
    KeyCount--; 8yn4}`Nc@  
    break; 0 <g{ V  
   } )Bo]=ZTJ^  
  } gSb,s [p&+  
 } )T9~8p.  
 return bRemoved; P/G>/MD/l  
} GLCAiSMz[  
rkq#7  
void VerifyWindow() Y~}5axSPH  
{ "mR*7o$|  
 for(int i=0;i<MAX_KEY;i++){ +>!V ]S  
  if(hCallWnd!=NULL){ S nW7x  
   if(!IsWindow(hCallWnd)){ Hte[TRbM  
    hCallWnd=NULL; ]w!0u2K<Q\  
    HotKey=0; )9B:Y;>)  
    HotKeyMask=0; FNC[59   
    KeyCount--; 1eHe~p ,  
   } i3P9sdTD  
  } Hs$'0:  
 } `^x9(i/NE  
} H'Nq#K  
-G-3q6A  
BOOL CHookApp::InitInstance() tF^g<)S;t  
{ ~ ltg  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); `]jqQr97  
 hins=AfxGetInstanceHandle(); o5SQ1;`   
 InitHotkey(); myIe_k,F  
 return CWinApp::InitInstance(); J1X~vQAe  
} OM)3Y6rK  
V#L'7">VP  
int CHookApp::ExitInstance() zW5C1:.3K  
{ b1xpz1  
 VerifyWindow(); &))\2pl  
 UnInit(); 0elxA8Z~e  
 return CWinApp::ExitInstance(); vQgq]mA?  
} BZ+;n |<r  
6WeM rWx  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !p',Za   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7 \X$7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {~_ Y _-  
#if _MSC_VER > 1000 RkA8  
#pragma once WI&lj<*  
#endif // _MSC_VER > 1000 gw+eM,Yp  
gfN2/TDC]P  
class CCaptureDlg : public CDialog epkD*7  
{ w#9_eq|3  
 // Construction n'M>xq_  
 public: w"~<h;  
  BOOL bTray; )c+k_;t'+  
  BOOL bRegistered; UFw](%=&M  
  BOOL RegisterHotkey(); 2"X~ju  
  UCHAR cKey; [Gtb+'8  
  UCHAR cMask; "(f`U.  
  void DeleteIcon(); "}zt`3  
  void AddIcon(); <<,>S&/  
  UINT nCount; n Q-mmY>#  
  void SaveBmp(); )R &,'`\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor p0VUh!  
  // Dialog Data u R:rO^  
  //{{AFX_DATA(CCaptureDlg) ||Y<f *  
  enum { IDD = IDD_CAPTURE_DIALOG }; ~=cmM  
  CComboBox m_Key; S&wzB)#'  
  BOOL m_bControl; S-c ^eLzQ  
  BOOL m_bAlt; }`_(<H  
  BOOL m_bShift; 2hq\n<  
  CString m_Path; cP rwW 6  
  CString m_Number; IZrk1fh  
  //}}AFX_DATA t,<UohL|z  
  // ClassWizard generated virtual function overrides (>7>3  
  //{{AFX_VIRTUAL(CCaptureDlg) >bIF>9T  
 public: Y3rt5\!  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9 <\`nm  
 protected: PVYyE3`UB  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support # yN*',I&  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !%[S49s  
  //}}AFX_VIRTUAL ].mqxf  
  // Implementation o35fifM`  
 protected: 6Hf,6>  
  HICON m_hIcon; [Y/:@t"2y  
  // Generated message map functions zk}{ dG^M:  
  //{{AFX_MSG(CCaptureDlg) G%:G eW  
  virtual BOOL OnInitDialog(); &%,DZA`  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); +}JM&bfK  
  afx_msg void OnPaint(); J=H)JH3  
  afx_msg HCURSOR OnQueryDragIcon(); GLUUY0  
  virtual void OnCancel(); Ow/@Z7~  
  afx_msg void OnAbout(); <]U1\~j  
  afx_msg void OnBrowse(); s&Yi 6:J  
  afx_msg void OnChange(); 8ObeiVXf)  
 //}}AFX_MSG  f^b K=#  
 DECLARE_MESSAGE_MAP() ^sClz*%?  
}; q>s`uFRg(  
#endif QJBr6   
LW:1/w&pv  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /+[63=fl  
#include "stdafx.h" 1@qgF  
#include "Capture.h" [Qj;/  
#include "CaptureDlg.h" <]d LX}C)  
#include <windowsx.h> d%ME@6K)  
#pragma comment(lib,"hook.lib") Hj6'pJ4  
#ifdef _DEBUG ue{xnjw>U  
#define new DEBUG_NEW ,={t8lN  
#undef THIS_FILE {' 5qv@3  
static char THIS_FILE[] = __FILE__; m;,xmEp  
#endif 7wVH8^|  
#define IDM_SHELL WM_USER+1 ^4pto$#@O:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .F2 :!h$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [TTSA2  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; WNy3@+@GZ  
class CAboutDlg : public CDialog 46No%cSiG  
{ A)NkT`<)  
 public: 2`bdrRD0  
  CAboutDlg(); (K<9h L+X  
  // Dialog Data l "pN90B4  
  //{{AFX_DATA(CAboutDlg) 8dO?K*J,H'  
  enum { IDD = IDD_ABOUTBOX }; 0.;}]v  
  //}}AFX_DATA Q8nId<\(  
  // ClassWizard generated virtual function overrides j6YiE~  
  //{{AFX_VIRTUAL(CAboutDlg) ]?LB?:6  
 protected: zP)~a  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~ 'Vxg}  
  //}}AFX_VIRTUAL D4u% 6R|F  
  // Implementation A :e;k{J  
 protected: h~} .G{"  
  //{{AFX_MSG(CAboutDlg) l#qv 5f  
  //}}AFX_MSG ^@6q  
  DECLARE_MESSAGE_MAP() D E/:['  
}; E"PcrWB&  
Xm!-~n@-m7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nJFg^s 1  
{ egR-w[{  
 //{{AFX_DATA_INIT(CAboutDlg) QlZ@ To  
 //}}AFX_DATA_INIT ^ c%N/V \  
} T.:+3:8|F  
osP\D iQ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $l[Rh1z`;+  
{ ftbpqp'  
 CDialog::DoDataExchange(pDX); 01@t~v3!Z  
 //{{AFX_DATA_MAP(CAboutDlg) md Gwh7/3  
 //}}AFX_DATA_MAP 04@cLDX8uB  
} RHY4P4B<v>  
9 c3E+  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) AMCyj`Ur  
 //{{AFX_MSG_MAP(CAboutDlg) nt :N!suP3  
 // No message handlers T)iW`vZg8  
 //}}AFX_MSG_MAP S4o$t -9l  
END_MESSAGE_MAP() =;L*<I  
uGP(R=H  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _aS;!6b8W  
: CDialog(CCaptureDlg::IDD, pParent) n.}T1q|l  
{ BlC<`2S  
 //{{AFX_DATA_INIT(CCaptureDlg) xL "!~dN  
  m_bControl = FALSE; >SmV74[s2  
  m_bAlt = FALSE; C NrII sJ  
  m_bShift = FALSE; z j{s}*  
  m_Path = _T("c:\\"); Yl^mAS[w&  
  m_Number = _T("0 picture captured."); _}6q{}jn:c  
  nCount=0; E/b"RUv}h  
  bRegistered=FALSE; Gh( A%x)  
  bTray=FALSE; ;0%OB*lcgE  
 //}}AFX_DATA_INIT  iThSt72  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 83Ou9E!W  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); zGo|JF  
} a2@c%i  
K7)kS  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) k;^ :  
{ uE5X~  
 CDialog::DoDataExchange(pDX); e":G*2a  
 //{{AFX_DATA_MAP(CCaptureDlg) hpbf&S4  
  DDX_Control(pDX, IDC_KEY, m_Key); PAF8W lg  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 9$*s8}|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 7<\C ?`q"  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); "&+3#D >  
  DDX_Text(pDX, IDC_PATH, m_Path); 5FeFN)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @'2m$a  
 //}}AFX_DATA_MAP +0$/y]k  
} r%]Qlt ~K  
*C|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^s:y/Kd  
//{{AFX_MSG_MAP(CCaptureDlg) >l5$9wO  
 ON_WM_SYSCOMMAND() _2ef LjXQ  
 ON_WM_PAINT() )xU-;z0"~  
 ON_WM_QUERYDRAGICON() /F/;G*n  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) S~OhtHwK  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %yS3&Ju  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 3251Vq %  
//}}AFX_MSG_MAP 1R%1h9I4'  
END_MESSAGE_MAP() ro~+j}*   
.?W5{U  
BOOL CCaptureDlg::OnInitDialog() @z`@f"l  
{ Z}6^ve  
 CDialog::OnInitDialog(); R W/z1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); xyh.N)  
 ASSERT(IDM_ABOUTBOX < 0xF000); $7Jo8^RE  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }:Z9Vc ZP`  
 if (pSysMenu != NULL) N_C;&hJN$w  
 { 4_?7&G0(  
  CString strAboutMenu; 'fd1Pj9~$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); i b6^x:HGU  
  if (!strAboutMenu.IsEmpty()) AONDx3[   
  { 2'0K WYM  
   pSysMenu->AppendMenu(MF_SEPARATOR); a:STQk V  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); |AZW9  
  } mh/n.*E7  
 } 4Ft1@  
 SetIcon(m_hIcon, TRUE); // Set big icon .p` pG3  
 SetIcon(m_hIcon, FALSE); // Set small icon u'~;Y.@i'  
 m_Key.SetCurSel(0); 5`+5{p  
 RegisterHotkey(); ~%k?L4%  
 CMenu* pMenu=GetSystemMenu(FALSE); ?uLeFD  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); uzr\oj+>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); k=ytuV\  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); S::=85[>z  
 return TRUE; // return TRUE unless you set the focus to a control G@ \Pi#1  
} J4$! 68  
.^(/n9|o-  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +C]&2zc.  
{ j{++6<tr  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~l[r a  
 { uq3{h B#  
  CAboutDlg dlgAbout; F"+o@9]  
  dlgAbout.DoModal(); m` AK~O2  
 } /u<nLj1  
 else {}~:&.D  
 { YvL?j  
  CDialog::OnSysCommand(nID, lParam); Y$>-%KcKeI  
 } bzpFbfb  
} )eeN1G`rDE  
3 fj  
void CCaptureDlg::OnPaint() p/6zEZ*  
{ S^I,Iz+`S'  
 if (IsIconic()) Dr<='Ux[5  
 { k`KGB  
  CPaintDC dc(this); // device context for painting q<vf,D@{ !  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); w*7|dZk{  
  // Center icon in client rectangle ;U =q-tb  
  int cxIcon = GetSystemMetrics(SM_CXICON); c~}l8M %  
  int cyIcon = GetSystemMetrics(SM_CYICON); Tb;d.^  
  CRect rect; upn~5>uCP  
  GetClientRect(&rect); >pyj]y^3  
  int x = (rect.Width() - cxIcon + 1) / 2; Njc%_&r  
  int y = (rect.Height() - cyIcon + 1) / 2; koG{ |elgB  
  // Draw the icon ]$-cMX  
  dc.DrawIcon(x, y, m_hIcon); 8TV;Rtl  
 } ed 59B)?l  
 else Q[n\R@  
 { DPgm%Xq9(!  
  CDialog::OnPaint(); 6c4&VW  
 } 'fV%Z  
} xg`h40c  
9Ru;`  
HCURSOR CCaptureDlg::OnQueryDragIcon() uLeRZSC  
{ 5v.DX`"  
 return (HCURSOR) m_hIcon; <~U4*  
} gwkb!#A  
yY{kG2b,  
void CCaptureDlg::OnCancel() @r^!{  
{ q}|U4MJm  
 if(bTray) M+>`sj  
  DeleteIcon(); Oft arD  
  CDialog::OnCancel(); b]Kk2S/  
} 6(&Y(/  
.\Fss(Zn  
void CCaptureDlg::OnAbout() U%B(5cC  
{ b}!3;:iD  
 CAboutDlg dlg; '1SG(0  
 dlg.DoModal(); \BV 0zKd  
} z$lF)r:Bc  
CBT>"sYE1  
void CCaptureDlg::OnBrowse() |f( ~@Q:  
{ Lm*VN~2  
 CString str; CJknJn3m&  
 BROWSEINFO bi; I+ l%Sn#\  
 char name[MAX_PATH]; ^>&k]T`  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); NUJ~YWO;  
 bi.hwndOwner=GetSafeHwnd(); Wl"0m1G  
 bi.pszDisplayName=name; t G.(flW,  
 bi.lpszTitle="Select folder"; ITJ q  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; jn%kG ~]'Q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); F!!N9VIC  
 if(idl==NULL) o5o^TW{  
  return; w FtN+  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); V\~WvV  
 str.ReleaseBuffer(); oP?YA-#nc  
 m_Path=str; OKOu`Hz@  
 if(str.GetAt(str.GetLength()-1)!='\\') Z,7R;,qX  
  m_Path+="\\"; H[Q_hY[>V  
 UpdateData(FALSE); r`\A nT?  
} mg:!4O$K  
iTo k[uJ}  
void CCaptureDlg::SaveBmp() 5~ 'Ie<Y_  
{ *ZSdl 0e  
 CDC dc; A~ (l{g  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2(!fg4#+  
 CBitmap bm; KU9Z"9#  
 int Width=GetSystemMetrics(SM_CXSCREEN); XkmQBV"  
 int Height=GetSystemMetrics(SM_CYSCREEN); "VxWj}+]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Yd cK&{  
 CDC tdc; er.L7  
 tdc.CreateCompatibleDC(&dc); al9.}  
 CBitmap*pOld=tdc.SelectObject(&bm); \(UKd v  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); L #[]I,  
 tdc.SelectObject(pOld); q> :$c0JY  
 BITMAP btm; ~}ml*<z@  
 bm.GetBitmap(&btm); dj6*6qX0'^  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 4pU>x$3$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); D<{{ :7n  
 BITMAPINFOHEADER bih; @JkK99\(>9  
 bih.biBitCount=btm.bmBitsPixel; qF)< H  
 bih.biClrImportant=0; 7Du1RuxP  
 bih.biClrUsed=0; nxm$}!Df  
 bih.biCompression=0; ,.IEDF<&  
 bih.biHeight=btm.bmHeight; OK|qv[  
 bih.biPlanes=1; " K*  
 bih.biSize=sizeof(BITMAPINFOHEADER); ?/*~;fM  
 bih.biSizeImage=size; -C7]qbT }  
 bih.biWidth=btm.bmWidth; nQK|n^AU/  
 bih.biXPelsPerMeter=0; hv$yV%.`  
 bih.biYPelsPerMeter=0; m#H3:-h,  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Ei>m0 ~<\  
 static int filecount=0; C_:k8?  
 CString name; xvLn'8H.  
 name.Format("pict%04d.bmp",filecount++); N6QVt f.  
 name=m_Path+name; I8   
 BITMAPFILEHEADER bfh; u0`o A  
 bfh.bfReserved1=bfh.bfReserved2=0; yI{5m^s{  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _A_ A$N~9  
 bfh.bfSize=54+size; p\v Mc\  
 bfh.bfOffBits=54; gieJ}Bv  
 CFile bf; ]1-z! B4K  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =TvzS%U  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ITuq/qts]A  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); cF T 9Lnz  
  bf.WriteHuge(lpData,size); {4 >mc'dv  
  bf.Close(); bEuaOBc  
  nCount++; he3SR @\T  
 } y? (2U6c  
 GlobalFreePtr(lpData); `:{B(+6  
 if(nCount==1) wt }9B[  
  m_Number.Format("%d picture captured.",nCount); o6kNx>tc)  
 else hmbj*8  
  m_Number.Format("%d pictures captured.",nCount); ]Al;l*yw  
  UpdateData(FALSE); 6"j_iB  
} N^?9ZO   
Wk;5/  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Pj#'}ru!  
{ {y kYW%3s  
 if(pMsg -> message == WM_KEYDOWN) XV>JD/K2  
 { YOyX[&oi  
  if(pMsg -> wParam == VK_ESCAPE) R614#yn-+  
   return TRUE; v *hRz;  
  if(pMsg -> wParam == VK_RETURN) 6`01EIk  
   return TRUE; hm$X]H`uMX  
 } ^{@!['  
 return CDialog::PreTranslateMessage(pMsg); pe0x""K  
} Ft{[ae?4  
Si}HX!s  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) G)=HB7u[a  
{ I{0 k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n;XWMY  
  SaveBmp(); I~eSZ?$s#  
  return FALSE; r4_eTrC,  
} ZsP2>%"  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ I XA>`D  
 CMenu pop; (n( fI f  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); z;u> Yz+3  
 CMenu*pMenu=pop.GetSubMenu(0); 0CvsvUN@  
 pMenu->SetDefaultItem(ID_EXITICON); z T%U!jqI  
 CPoint pt; yTM{|D]$(  
 GetCursorPos(&pt); L7Dh(y=;7  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); .?C%1a&_l  
 if(id==ID_EXITICON) #>;FUZuJr  
  DeleteIcon(); ]J1S#Q5'  
 else if(id==ID_EXIT) ig"uXs  
  OnCancel(); d=.2@Ry  
 return FALSE; 3Q}$fQ&S  
} !,$i6gm  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1nj(h g  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `<\}FS`'  
 AddIcon(); beY=g7|  
 return res; Ru!He,k7  
} @pV5}N[]  
z(RL<N%  
void CCaptureDlg::AddIcon() ~K_Uq*dCE  
{ <{(/E0~V/<  
 NOTIFYICONDATA data; &6 -k#r  
 data.cbSize=sizeof(NOTIFYICONDATA); 4tA_YIv  
 CString tip; Die-@z|Y  
 tip.LoadString(IDS_ICONTIP); $ls[|N:y0l  
 data.hIcon=GetIcon(0); C@y8.#l  
 data.hWnd=GetSafeHwnd(); AS!6XT  
 strcpy(data.szTip,tip); p(SRjQt  
 data.uCallbackMessage=IDM_SHELL; 5R$G(Ap_  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _hf4A8ak  
 data.uID=98; Kz8:UG(  
 Shell_NotifyIcon(NIM_ADD,&data); "kMzmo=Pv5  
 ShowWindow(SW_HIDE); -php6$|  
 bTray=TRUE; Ths_CKwgWY  
}  /RZR}  
fr6^nDY  
void CCaptureDlg::DeleteIcon() _Yb _D/  
{ ~0"p*?^  
 NOTIFYICONDATA data; N8cAqr  
 data.cbSize=sizeof(NOTIFYICONDATA); 5}ie]/[|  
 data.hWnd=GetSafeHwnd(); =iB,["s  
 data.uID=98; 9D\4n  
 Shell_NotifyIcon(NIM_DELETE,&data); Uh}seB#mJj  
 ShowWindow(SW_SHOW); d87vl13  
 SetForegroundWindow(); PrQ?PvA<L  
 ShowWindow(SW_SHOWNORMAL); vEM(bT=H  
 bTray=FALSE; Zx }&c |Q  
} Z]w# vLR  
vQVK$n`  
void CCaptureDlg::OnChange() $>M<j  
{ XhzGLYb~I`  
 RegisterHotkey(); Rn%N&1 Ef  
} Ko>&)%))$X  
f67NWFX  
BOOL CCaptureDlg::RegisterHotkey() }0 hL~i  
{ N<|$h5isq  
 UpdateData(); 2g{)AtK$#  
 UCHAR mask=0; vY|^/[x#B  
 UCHAR key=0; z(uZF3  
 if(m_bControl) MjfFf} @  
  mask|=4; l*b)st_p%  
 if(m_bAlt) PQW(EeQ  
  mask|=2; Gnm4gF!BI  
 if(m_bShift) iL{M+Ic  
  mask|=1; o;"OSp  
  key=Key_Table[m_Key.GetCurSel()]; *="8?Z  
 if(bRegistered){ jdeV|H} u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 07T70[G  
  bRegistered=FALSE; [36,eK  
 } u]^N&2UW  
 cMask=mask; [mxTa\  
 cKey=key; /76 1o\Q  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D-imL;|  
 return bRegistered; m%+IPZ2m  
} %m5Q"4O  
{MAQ/5  
  四、小结 _zxLwU1(x  
TfxwVPX  
  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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