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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: )qyJw N .D  
  .m r& zq  
  一、实现方法 nTG@=C#  
2 %`~DVo  
  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: q:}Q5gzZ  
DQ#rZi3I  
#pragma data_seg("shareddata") H<Ne\zAv  
HHOOK hHook =NULL; //钩子句柄 q?&Ap*  
UINT nHookCount =0; //挂接的程序数目 &oU) ,H  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 B^;G3+}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 "L?h@8sa  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey o7_*#5rD  
static int KeyCount =0; @ )bCh(u  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 D90.z"N\i9  
#pragma data_seg() {c(@u6l28  
 BVJ6U[h`  
  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。 ( o(,;  
zCpsGr  
  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: ,sa%u Fm  
-[h2fqu1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR YI877T9>  
cKey,UCHAR cMask) HITw{RPrW  
{ BXzn-S  
 BOOL bAdded=FALSE; 9a$\l2  
 for(int index=0;index<MAX_KEY;index++){ Qru iQ/t  
  if(hCallWnd[index]==0){ %>)HAx `  
   hCallWnd[index]=hWnd; CXAW>VdK_  
   HotKey[index]=cKey; uPbGQ:%}  
   HotKeyMask[index]=cMask; ls;!Og9  
   bAdded=TRUE; 5 ]c\{G  
   KeyCount++; 80'!XKSP  
   break; b6]MJ0do  
  } 3dl#:Si  
 } ?3duW$`  
 return bAdded; k}0Y&cT!rU  
} 3QD+&9{D  
//删除热键 qcmf*Yl:v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [. rULQl  
{ 6d# 7  
 BOOL bRemoved=FALSE; 2#i*'.  
 for(int index=0;index<MAX_KEY;index++){ j\LJ{?;jC  
  if(hCallWnd[index]==hWnd){ B(eC|:w[z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *wfb~&: }  
    hCallWnd[index]=NULL; Y<ZaW{%  
    HotKey[index]=0; g"KH~bN  
    HotKeyMask[index]=0; I:l/U-b7h  
    bRemoved=TRUE; C6 PlO  
    KeyCount--; B$\,l.h E  
    break; 6r]l8*3 4;  
   } o/J2BZ<_<  
  } K6z)&<  
 } h1_9Xp~N  
 return bRemoved; 8kRqF?rbj  
} {:%A  
"p"M9P'  
j%q,]HCANh  
  DLL中的钩子函数如下: u)hr  
f[XsnN2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) e I^Q!b8n  
{ .Fl5b}C(  
 BOOL bProcessed=FALSE; %v"qFYVX"  
 if(HC_ACTION==nCode) Dt ~3Qd0  
 { rGqT[~{t  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ]di^H>,xU  
   switch(wParam) ~d9@m#_T#~  
   {  j,Vir"-)  
    case VK_MENU: Fr|Ts>Kx  
     MaskBits&=~ALTBIT; =>0 G  
     break; (fTi1 I!  
    case VK_CONTROL: )q8!:Z  
     MaskBits&=~CTRLBIT; N E/_  
     break; ,zP.ch0K  
    case VK_SHIFT: {0~xv@ U  
     MaskBits&=~SHIFTBIT; m"|AD/2;(  
     break; o3ZqPk]al  
    default: //judge the key and send message e.>>al  
     break; B/^1uPTZ71  
   } wBJP8wES=  
   for(int index=0;index<MAX_KEY;index++){ c]x'}K c  
    if(hCallWnd[index]==NULL)  L7rEMq  
     continue; CKuf'h#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 37U2Tb!y '  
    { LP{@r ic  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .wPu #*  
     bProcessed=TRUE; k@Q>(`  
    } %"gV>E_u  
   } C4h4W3w  
  }  aj|gt  
  else if((lParam&0xc000ffff)==1){ //有键按下 *?`<Ea  
   switch(wParam) Ij_h #f   
   { V|q`KOF  
    case VK_MENU: 0;X0<IV  
     MaskBits|=ALTBIT; ? 3t]9z  
     break; 5;:964Et  
    case VK_CONTROL: G,-x+e"  
     MaskBits|=CTRLBIT; 66Tx>c"H  
     break; cg| C S?  
    case VK_SHIFT: qN@-H6D1=  
     MaskBits|=SHIFTBIT; _yu_Ev}R  
     break; Mv1V Vk  
    default: //judge the key and send message ln*_mM/Q%  
     break; '7ps_pz  
   } M!#[(:  
   for(int index=0;index<MAX_KEY;index++){ lDf:~  
    if(hCallWnd[index]==NULL) IV]2#;OO?  
     continue; %I^y@2A4`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y)](jU%o  
    { 0XLoGQ=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); FJC}xEMcN  
     bProcessed=TRUE; ?,AWXiif  
    } SQhw |QdG  
   } WvVf+| Km  
  } IPxK$nI^  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \*r]v;NcP  
   for(int index=0;index<MAX_KEY;index++){ Y5XhV;16  
    if(hCallWnd[index]==NULL) '"4S3Fysm  
     continue; ^1jZwP;5eW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [+_0y[~,tB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8EC$p} S  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 O @)D%*;v  
   } &"/IV$H  
  } 0'nY  
 } Ed ,O>(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .G/2CVMj  
} ,nnVHBN  
=L F9im  
  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:  +}-Ecr  
,2/y(JX}*!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _ rIFwT1]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \|< 5zL  
#$*l#j"#A  
  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: j%TcW!D-_  
QBwgI>zfS"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ip&Q'"HYj  
{ lr-:o@q{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /2jw]ekQ'  
 { d2=Z=udd  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 .`5BgX7W  
  SaveBmp(); 4.o[:5'  
  return FALSE; z&W5@6")`  
 } o0`|r+E\  
 …… //其它处理及默认处理 k,M %"FLQ  
} |j> fsk~  
f!D~aJ  
'du{ky  
  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。 U%zZw)  
oH vVZ  
  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。 $9In\ x  
cpe/GvD5]  
  二、编程步骤 %$3)xtS6  
 `GQ'yv  
  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"; Qf<@ :T*  
r-]HmY x  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; A3cW8 OClz  
^cz;UQX~}  
  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; gsD0N^  
 aa10vV  
  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; ^N2N>^'&1.  
.V'=z|   
  5、 添加代码,编译运行程序。 ~V?3A/]  
#fTPo:*t  
三、程序代码 +i1\],7  
_=d X01  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL S-D=-{@  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) )?D w)s5  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ _WeN\F~^  
#if _MSC_VER > 1000 cPL]WI0(  
#pragma once qL1 d-nH  
#endif // _MSC_VER > 1000 dX vp-oi  
#ifndef __AFXWIN_H__ kIlK"=  
#error include 'stdafx.h' before including this file for PCH ;+W9EbY2  
#endif :Tu%0="ye  
#include "resource.h" // main symbols :4'Fq;%C  
class CHookApp : public CWinApp D/7hVwMw:  
{ JAA{5@ST  
 public: 1p]Z9$Y  
  CHookApp(); IP e"9xb  
  // Overrides wg0hm#X  
  // ClassWizard generated virtual function overrides Dw-i!dq  
  //{{AFX_VIRTUAL(CHookApp) kV$$GLD\  
 public: Ohe* m[  
  virtual BOOL InitInstance(); WG\gf\=I  
  virtual int ExitInstance(); V {H/>>k7  
  //}}AFX_VIRTUAL PR i3=3oF  
  //{{AFX_MSG(CHookApp) H6Qb]H. C  
  // NOTE - the ClassWizard will add and remove member functions here. ]Y%U5\$  
  // DO NOT EDIT what you see in these blocks of generated code ! ujMics(  
  //}}AFX_MSG UC{Tmf  
  DECLARE_MESSAGE_MAP() M!nwcxB!  
}; leMcY6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -g`3;1EV^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z-wvdw]$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }?vVJm'  
BOOL InitHotkey(); 0*-nVC1  
BOOL UnInit(); RxZ#`$F  
#endif ))z1T8  
48  |u{  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. n;+e(ob;;  
#include "stdafx.h" XnCrxj  
#include "hook.h" Js( "H  
#include <windowsx.h> ;?`l1:C5)  
#ifdef _DEBUG 3$hbb6N%6.  
#define new DEBUG_NEW k=o>DaEh(  
#undef THIS_FILE SFdSA4D"  
static char THIS_FILE[] = __FILE__; fL7u419=  
#endif }G50?"^u  
#define MAX_KEY 100 (K>=!&tlp=  
#define CTRLBIT 0x04 .xIu  
#define ALTBIT 0x02 vs|_l!n3  
#define SHIFTBIT 0x01 N)rf /E0  
#pragma data_seg("shareddata") IC:wof "  
HHOOK hHook =NULL; $F,&7{^  
UINT nHookCount =0; mhXSbo9w-  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ygz6 ~(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Q#$#VT!F  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey qp6*v&  
static int KeyCount =0; *gxo! F}  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift pPX~pPIj2  
#pragma data_seg() = e>#oPH  
HINSTANCE hins; XA%a7Xtni  
void VerifyWindow(); iH#b"h{w  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 14,Pf`5Sz  
//{{AFX_MSG_MAP(CHookApp) 9^5D28y  
// NOTE - the ClassWizard will add and remove mapping macros here. aTx*6;-PH  
// DO NOT EDIT what you see in these blocks of generated code! 3>I   
//}}AFX_MSG_MAP _\y%u_W  
END_MESSAGE_MAP() :y!%GJW  
hk+8s\%-  
CHookApp::CHookApp() e dTFk$0  
{ a\-AGG{2/X  
 // TODO: add construction code here, :A7\eN5  
 // Place all significant initialization in InitInstance dJv2tVm&'  
} ?}RPn f  
+>3jMs~&  
CHookApp theApp; [s4|+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) tn{YIp   
{ :a/l9 m(  
 BOOL bProcessed=FALSE; O NVhB  
 if(HC_ACTION==nCode) y%Rq6P=4Q  
 { Ie4\d2tQ;  
  if((lParam&0xc0000000)==0xc0000000){// Key up wKU9I[]  
   switch(wParam) igx~6G*  
   { C19}Y4r:  
    case VK_MENU: mUj_V#v  
     MaskBits&=~ALTBIT; PctXh, =  
     break; "7q!u,u  
    case VK_CONTROL: P{,A%t  
     MaskBits&=~CTRLBIT; ui RO,B}z  
     break; .(RZ&*4  
    case VK_SHIFT: iC{(vL0P+  
     MaskBits&=~SHIFTBIT; ]ur?i{S,  
     break; {p.^E5&  
    default: //judge the key and send message &@K6;T  
     break; b)eoFc)lc  
   } 1etT."  
   for(int index=0;index<MAX_KEY;index++){ %oB0@&!mS  
    if(hCallWnd[index]==NULL) ZIN1y;dJ  
     continue; ,eGguNA9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GKc?  
    { <?nz>vz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u*f`\vs  
     bProcessed=TRUE; /W GD7\G'8  
    } |LW5dtQ  
   } [tT_ z<e`  
  } yh2)Pc[  
  else if((lParam&0xc000ffff)==1){ //Key down S B~opN  
   switch(wParam) -Uan.#~S  
   {  !2kM  
    case VK_MENU: Mw3$QRM  
     MaskBits|=ALTBIT; fMIRr5  
     break; k%3)J"|/  
    case VK_CONTROL: IL go:xQ  
     MaskBits|=CTRLBIT; #{*5rKiL  
     break; 5,-g^o7  
    case VK_SHIFT: )DmydyQ'  
     MaskBits|=SHIFTBIT; CBO*2?]s  
     break; ",l6-<s  
    default: //judge the key and send message !Q WNHL  
     break; 7t+d+sQ-l  
   } mPU}]1*p  
   for(int index=0;index<MAX_KEY;index++)  svx7  
   { AR!v%Z49i  
    if(hCallWnd[index]==NULL) NE.h/+4  
     continue;  v%$l(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ht*N[Pi4;  
    { ,m[XeI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &?@[bD'T  
     bProcessed=TRUE; #|K{txC   
    } tm/=Oc1p  
   } X::@2{-@y  
  } \=D+7'3  
  if(!bProcessed){ +oh|r'~  
   for(int index=0;index<MAX_KEY;index++){ Nyt*mbd5 {  
    if(hCallWnd[index]==NULL) Zb=;\l*&  
     continue; MJh.)kd$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >fMzUTJ4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wo+`WnDh  
   } tA^+RO4  
  } X{Fr  
 } o{>4PZ}=g  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); X1d{7H8A2  
} 5kGQf  
w[F})u]E  
BOOL InitHotkey() 8nn g^  
{ =/}Rnl+c  
 if(hHook!=NULL){ e]nP7TIU  
  nHookCount++; oKYa ?  
  return TRUE; 8o[gzW:Q)U  
 } "n]x%. *  
 else >;XtJJS  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [ :)F-  
  if(hHook!=NULL) CuK>1_Dq  
   nHookCount++; T_!F I29  
  return (hHook!=NULL); cHt4L]n8n  
} Oe x   
BOOL UnInit() ]h~F%   
{ i9Beap/t$  
 if(nHookCount>1){ 0J^Z)U>j  
  nHookCount--; w+"E{#N  
  return TRUE; *Lxt{z`9  
 } c0Bqm  
 BOOL unhooked = UnhookWindowsHookEx(hHook); wm^1Fn--  
 if(unhooked==TRUE){ }-sh  
  nHookCount=0; SHs [te[  
  hHook=NULL; Lc?"4  
 } g%tUkM  
 return unhooked; 1TX3/]:  
} tH&eKM4G  
tvf5b8(Y-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) K\KQ(N8F  
{ C[<{>fl)  
 BOOL bAdded=FALSE; oQrfrA&=M  
 for(int index=0;index<MAX_KEY;index++){ ]]_5_)"4  
  if(hCallWnd[index]==0){ Zn JJ-zP  
   hCallWnd[index]=hWnd; NC!B-3?x  
   HotKey[index]=cKey; y9?*H?f,  
   HotKeyMask[index]=cMask; Iila|,cM  
   bAdded=TRUE; GApvRR+Z  
   KeyCount++; pY-!NoES  
   break; ~Er0$+q=Y;  
  } IP$eJL[&D"  
 } 5L<A7^j  
 return bAdded; Xp| 4WM  
} ob8}v*s  
r>! @Z2%s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9(qoME}>=  
{ q+4dHS)x  
 BOOL bRemoved=FALSE; 5x|$q kI  
 for(int index=0;index<MAX_KEY;index++){ x0>N{ADXQ  
  if(hCallWnd[index]==hWnd){ X.>~DT%0Lm  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `),U+  
    hCallWnd[index]=NULL; 5FuV=Yuc  
    HotKey[index]=0; A(uo%QE|  
    HotKeyMask[index]=0; B_iaty   
    bRemoved=TRUE; ={v(me0ZPb  
    KeyCount--; U\, N  
    break; :R +BC2x  
   } F WU >WHX  
  } -(e=S^36  
 } ^wc:qll  
 return bRemoved; @=P c{xp  
} v FQ]>n X  
.SmG)5U]  
void VerifyWindow() 88<d<)7t  
{ yPT o,,ca=  
 for(int i=0;i<MAX_KEY;i++){ 5D=U.UdR  
  if(hCallWnd!=NULL){ ]@cI_n  
   if(!IsWindow(hCallWnd)){ F'>yBDm*OM  
    hCallWnd=NULL; %).I &)i  
    HotKey=0; AX&Emz-  
    HotKeyMask=0; GIkeZV{4}  
    KeyCount--; Ct?xTFb  
   } uPbdzUk$  
  } wSCI?  
 } O"|d~VQ  
} .b`8 +  
7p\&D?  
BOOL CHookApp::InitInstance() U[Sh){4j  
{ <+r~?X_  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8+7*> FD)1  
 hins=AfxGetInstanceHandle(); RTvOaZ  
 InitHotkey(); (e~9T MY  
 return CWinApp::InitInstance(); |OAiHSW"V  
} @:B}QxC  
,SIGfd  
int CHookApp::ExitInstance() |:4W5>sfg  
{ }+MA*v[06  
 VerifyWindow(); ^fsC]9NS  
 UnInit(); _g9j_ x:=  
 return CWinApp::ExitInstance(); ZU0*iA  
} nj00g>:>  
b?cO+PY01  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file G9xO>Xp^Al  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) LttA8hf5q?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ js;YSg{m  
#if _MSC_VER > 1000 ,4XOe,WQ  
#pragma once ,Xn %0]  
#endif // _MSC_VER > 1000 p ^TCr<=  
^~TE$i<   
class CCaptureDlg : public CDialog ar 7.O;e  
{ _qk&W_u  
 // Construction \(=xc2  
 public: G\5Bdo1g  
  BOOL bTray; of7p~{3H  
  BOOL bRegistered; 6&6dd_K(  
  BOOL RegisterHotkey(); {|OXiRm'  
  UCHAR cKey; S76MY&Vx23  
  UCHAR cMask; -qvMMit%7  
  void DeleteIcon(); dT&u}o3X  
  void AddIcon();  q^6#.}  
  UINT nCount; N}[!QE  
  void SaveBmp(); T*Ge67  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4JXvP1`  
  // Dialog Data w'_|X&@H  
  //{{AFX_DATA(CCaptureDlg) fWWB]h  
  enum { IDD = IDD_CAPTURE_DIALOG }; eHGx00:  
  CComboBox m_Key; {,6J*v"o  
  BOOL m_bControl; P_mP ^L  
  BOOL m_bAlt; `-cw[@uD  
  BOOL m_bShift; x[)]u8^A  
  CString m_Path; (nBh6u*  
  CString m_Number; "X!1^)W -8  
  //}}AFX_DATA UUbO\_&y  
  // ClassWizard generated virtual function overrides ZQir?1=  
  //{{AFX_VIRTUAL(CCaptureDlg) )K::WqR%w)  
 public: O[L#|_BnEO  
  virtual BOOL PreTranslateMessage(MSG* pMsg); HE_UHv  
 protected: (E,[Ad,$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Unq~lt%2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); nFI<Te^)  
  //}}AFX_VIRTUAL t5i58@{~  
  // Implementation %[~g84@  
 protected: -vc$I=b;  
  HICON m_hIcon; = \oW {?  
  // Generated message map functions 9C Ki$L  
  //{{AFX_MSG(CCaptureDlg) ,JbP~2M~%  
  virtual BOOL OnInitDialog(); m :~y:.  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); .X)Wb{7  
  afx_msg void OnPaint(); Ay^P #\VZ  
  afx_msg HCURSOR OnQueryDragIcon(); MT)q?NcG  
  virtual void OnCancel(); I1s= =  
  afx_msg void OnAbout(); P*%P"g  
  afx_msg void OnBrowse(); <tsexsw  
  afx_msg void OnChange(); ?UIW&*h}  
 //}}AFX_MSG Z 5P4 H  
 DECLARE_MESSAGE_MAP() l= Jw6F+5  
}; pV\> ?  
#endif Z-_Xt^N  
.!lLj1?p  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file a+O?bO  
#include "stdafx.h" 73]t5=D:  
#include "Capture.h" S1~K.<B  
#include "CaptureDlg.h" m J$[X  
#include <windowsx.h> i PG:w+G  
#pragma comment(lib,"hook.lib") 'L9hM.+  
#ifdef _DEBUG +eKLwM  
#define new DEBUG_NEW *:un+k  
#undef THIS_FILE /F|VYl^_  
static char THIS_FILE[] = __FILE__; Slv:CM M  
#endif xC0y2+)|  
#define IDM_SHELL WM_USER+1 R-,L"Vv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ei=u$S.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m]Qs BK  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; %BMlc m7Ec  
class CAboutDlg : public CDialog :f_oN3F p  
{ #uC}IX2n  
 public: FzCXA=m  
  CAboutDlg(); hgDFhbHtd6  
  // Dialog Data 9jx>&MnWs  
  //{{AFX_DATA(CAboutDlg) M$>Nd6,@N  
  enum { IDD = IDD_ABOUTBOX }; s[/d}S@ >  
  //}}AFX_DATA :M`~9MCRf  
  // ClassWizard generated virtual function overrides *} Z  
  //{{AFX_VIRTUAL(CAboutDlg) " s_S!;w@  
 protected: <HS{A$]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =`N 0  
  //}}AFX_VIRTUAL U#w0E G  
  // Implementation ZZ :*c"b:  
 protected: 0jxXUWO  
  //{{AFX_MSG(CAboutDlg) 55] MRv  
  //}}AFX_MSG u WdKG({][  
  DECLARE_MESSAGE_MAP() cG@W o8+  
}; jeA2y jAC  
tux`-F  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) "A~D(1K  
{ 8ql<7RTM!  
 //{{AFX_DATA_INIT(CAboutDlg) <m{#u4FC'  
 //}}AFX_DATA_INIT P%vouC0W  
} Q?([#  
R*k;4*1u  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) a0B%x!y^  
{ "fSaM&@[B  
 CDialog::DoDataExchange(pDX); U;u4ey  
 //{{AFX_DATA_MAP(CAboutDlg) Al *yx_j  
 //}}AFX_DATA_MAP 6L Fhhl^  
} Uqj$itqUQ  
=eDC{/K  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) u$ o 19n  
 //{{AFX_MSG_MAP(CAboutDlg) @(N} {om  
 // No message handlers s9+lC!!  
 //}}AFX_MSG_MAP j b'M  
END_MESSAGE_MAP() "qZTgCOY2  
FLkZZ\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) )?l7I*  
: CDialog(CCaptureDlg::IDD, pParent) Qn-nO_JL  
{ 3G^A^]h  
 //{{AFX_DATA_INIT(CCaptureDlg) QC] <`!  
  m_bControl = FALSE; 8-kR {9r  
  m_bAlt = FALSE; BV/ ^S.~  
  m_bShift = FALSE; as y:[r"  
  m_Path = _T("c:\\"); zA$ f$J7\^  
  m_Number = _T("0 picture captured."); ]y$/~(OW  
  nCount=0; SymlirL  
  bRegistered=FALSE; >>y\idg&:  
  bTray=FALSE; ]z=dRq  
 //}}AFX_DATA_INIT N6S@e\*  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 pRsIi_~&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d}Y#l}!E6  
} sE{5&aCSR  
n3eWqwQ$5  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) E\9HZ;}G  
{ 5UK}AkEe&x  
 CDialog::DoDataExchange(pDX); N693eN!  
 //{{AFX_DATA_MAP(CCaptureDlg) +~ Y.m8  
  DDX_Control(pDX, IDC_KEY, m_Key); 5s4x%L (~}  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); M A%g-}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); sdd%u~4,X  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); z`u$C+Ov  
  DDX_Text(pDX, IDC_PATH, m_Path); :zO;E+s  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wsAb8U C_  
 //}}AFX_DATA_MAP ku>Bxau4>  
} 7[R`52pP  
ALInJ{X  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5RY-.c4}  
//{{AFX_MSG_MAP(CCaptureDlg) i`}9VaUG  
 ON_WM_SYSCOMMAND() ?a?4;Y!  
 ON_WM_PAINT() (58r9WhS  
 ON_WM_QUERYDRAGICON() 'cK{FiIT  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 5;XU6Rz!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) mr]~(]B?r  
 ON_BN_CLICKED(ID_CHANGE, OnChange) l6MBnvi   
//}}AFX_MSG_MAP q!h'rX=_-  
END_MESSAGE_MAP() PBL=P+  
;uZeYY?   
BOOL CCaptureDlg::OnInitDialog() !<X/_+G\  
{ ?fc<3q"  
 CDialog::OnInitDialog(); )W vOa] :  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); !SLfAFcS  
 ASSERT(IDM_ABOUTBOX < 0xF000); oIE3`\xS  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \"5p )(  
 if (pSysMenu != NULL) R-4#y%k<  
 { Vy=+G~  
  CString strAboutMenu; 7MKZ*f@x;  
  strAboutMenu.LoadString(IDS_ABOUTBOX); k@>(sXs  
  if (!strAboutMenu.IsEmpty()) )hVn/*mH  
  { o?#-Tkb  
   pSysMenu->AppendMenu(MF_SEPARATOR); n%QWs 1 b  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); K&-u W_0  
  } j~9![s!  
 } V9>$M=  
 SetIcon(m_hIcon, TRUE); // Set big icon #??[;xjs!  
 SetIcon(m_hIcon, FALSE); // Set small icon T7Ju7_q}  
 m_Key.SetCurSel(0); ~eiD(04^r*  
 RegisterHotkey(); 5pff}Ru`  
 CMenu* pMenu=GetSystemMenu(FALSE); jF#Dc[*  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); d@Wze[M?0  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }p8iq  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); mK^E@uxN  
 return TRUE; // return TRUE unless you set the focus to a control j:^gmZ;J  
} yio8BcXH54  
(d.M} G  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >Wd_?NaI  
{ ^7*zi_Q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)  W}Rzn  
 { !rZZ/M"i  
  CAboutDlg dlgAbout; /(%!txSNEt  
  dlgAbout.DoModal(); CRNt5T>qH  
 } C_h$$G{S(  
 else 6y{CM/DC  
 { TeJ=QpGW2  
  CDialog::OnSysCommand(nID, lParam); ArT@BqWd  
 } .rlLt5b%  
} a`U/|[JM  
}/L#<n`Z  
void CCaptureDlg::OnPaint() *A0d0M]cg  
{ R|*Eg,1g -  
 if (IsIconic()) IfP?+yPa  
 { G//hZwf0  
  CPaintDC dc(this); // device context for painting lxR]Bh+  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @)ls+}=Y  
  // Center icon in client rectangle _]0<G8|Rv  
  int cxIcon = GetSystemMetrics(SM_CXICON); &IG*;$c!  
  int cyIcon = GetSystemMetrics(SM_CYICON); ,OMdLXr  
  CRect rect; ?MSV3uODb  
  GetClientRect(&rect); Jgq#m~M6  
  int x = (rect.Width() - cxIcon + 1) / 2; 1T4#+kW&  
  int y = (rect.Height() - cyIcon + 1) / 2; b |ijkys  
  // Draw the icon rWN%j)#+  
  dc.DrawIcon(x, y, m_hIcon); Vw&# Lo  
 } )3 '8T>^<K  
 else -O $!sFmY  
 { *3fhVl=8^*  
  CDialog::OnPaint(); I 6L3M\+-  
 } iBY16_q  
} j:HIcCp  
m:9|5W  
HCURSOR CCaptureDlg::OnQueryDragIcon() y7Hoy.(  
{ A^\g]rmK  
 return (HCURSOR) m_hIcon; ?lU(FK  
} AU8sU?=  
8/"C0I (G  
void CCaptureDlg::OnCancel() qtz~Y~h|>  
{ q0nIJ(  
 if(bTray) kJCeQK:W  
  DeleteIcon(); {=MRJg!U  
  CDialog::OnCancel(); TALiH'w6|e  
} >h$Q%w{V  
-6e^`c6{  
void CCaptureDlg::OnAbout() D]WrPWL8v  
{ e0]%ko"  
 CAboutDlg dlg; j=u) z7J  
 dlg.DoModal(); 0W)|n9  
} ~,x4cOdR#  
?kF? ~\c  
void CCaptureDlg::OnBrowse() c^z) [  
{ mp*?GeV?M  
 CString str; MieO1l  
 BROWSEINFO bi; x-b}S1@  
 char name[MAX_PATH]; F;T;'!mb  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Bc'Mj=>;  
 bi.hwndOwner=GetSafeHwnd(); +DE;aGQ.z?  
 bi.pszDisplayName=name;  +&<k}Mz  
 bi.lpszTitle="Select folder"; I |"'  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; <00=bZzX  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); SErh"~[  
 if(idl==NULL) ^Iqu^n?2.  
  return; equi26jhr  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); y=AF EP  
 str.ReleaseBuffer(); E *782>  
 m_Path=str; G\~?.s|^  
 if(str.GetAt(str.GetLength()-1)!='\\') zd{sw}  
  m_Path+="\\"; k+hl6$:Qj%  
 UpdateData(FALSE); *aGJ$ P0  
} LyG`q3@  
lcVG<*gf-  
void CCaptureDlg::SaveBmp() $v5 >6+-n  
{ uXb} o UC  
 CDC dc; xxld.j6  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); % pAbkb3m  
 CBitmap bm; i9T<(sdK+  
 int Width=GetSystemMetrics(SM_CXSCREEN); (U\D7ItMG  
 int Height=GetSystemMetrics(SM_CYSCREEN); z|zEsDh;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Q(4~r+  
 CDC tdc;  %\~U>3Q  
 tdc.CreateCompatibleDC(&dc); v4Kf{9q#  
 CBitmap*pOld=tdc.SelectObject(&bm); ]2A2<Q_,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?6h~P:n.  
 tdc.SelectObject(pOld); }]^/`n  
 BITMAP btm; ;jBS:k?  
 bm.GetBitmap(&btm);  pQ7<\8s*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; }nSu7)3$B  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); B;2#Sa.  
 BITMAPINFOHEADER bih; =,X*40=  
 bih.biBitCount=btm.bmBitsPixel; MooxT7  
 bih.biClrImportant=0; D$E#:[  
 bih.biClrUsed=0; FU;a { irB  
 bih.biCompression=0; {Q @?CT  
 bih.biHeight=btm.bmHeight; x{/-&`F  
 bih.biPlanes=1; Vt:\llsin  
 bih.biSize=sizeof(BITMAPINFOHEADER); qq@]xdl  
 bih.biSizeImage=size;  ^mN`!+  
 bih.biWidth=btm.bmWidth; lwIxn1n  
 bih.biXPelsPerMeter=0; b*4aUpW  
 bih.biYPelsPerMeter=0; >~tx8aI{  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); n'%cO]nSx  
 static int filecount=0; 9WV8ZP  
 CString name; p(9[*0.};  
 name.Format("pict%04d.bmp",filecount++); qggRS)a  
 name=m_Path+name; RLcC>Z  
 BITMAPFILEHEADER bfh; ZvK.X*~s  
 bfh.bfReserved1=bfh.bfReserved2=0; ,$RXN8x1  
 bfh.bfType=((WORD)('M'<< 8)|'B'); qLl4t/p  
 bfh.bfSize=54+size; N2lz {  
 bfh.bfOffBits=54; +fq\K]  
 CFile bf; 2-@t,T  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;Zn&Nc7  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); :)FNhx3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); XXeDOrb  
  bf.WriteHuge(lpData,size); }9FWtXAU^1  
  bf.Close(); D[4%CQ1m  
  nCount++; K??jV&Xor  
 } ?~cO\(TY["  
 GlobalFreePtr(lpData); ezri9\Ju  
 if(nCount==1) {\|XuCF#  
  m_Number.Format("%d picture captured.",nCount); fuWAw^&  
 else `G=+qti  
  m_Number.Format("%d pictures captured.",nCount); LLoV]~dvUu  
  UpdateData(FALSE); LLMGs: [  
} 'R99m?"  
%/ :&L+q  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Ds{bYK_y  
{ ,wy;7T>ODd  
 if(pMsg -> message == WM_KEYDOWN) Y@qugQM>  
 { %4BQY>O)@  
  if(pMsg -> wParam == VK_ESCAPE) w{]B)>! 1W  
   return TRUE; L x iN9  
  if(pMsg -> wParam == VK_RETURN) "W_E!FP]r  
   return TRUE; J?tnS6V  
 } 6="o&!  
 return CDialog::PreTranslateMessage(pMsg); \x5>H:\Y  
} ZT`" {#L  
MJa` 4[/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "#iO{uMWb  
{ TJB4N$-}A  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ e-.(O8  
  SaveBmp(); 1f?Fuw  
  return FALSE; uzLm TmM+  
} `m$,8f%j6_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $U(D*0+o/  
 CMenu pop; mxe\+j#  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); <TS ps!(#  
 CMenu*pMenu=pop.GetSubMenu(0); !>&G+R+k  
 pMenu->SetDefaultItem(ID_EXITICON); J%fJF//U  
 CPoint pt; a FWTm,)  
 GetCursorPos(&pt); ' -aLBAxy  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4#I=n~8a  
 if(id==ID_EXITICON) {}=5uU2Tu  
  DeleteIcon(); ^9YS dFH/  
 else if(id==ID_EXIT) ^PMA"!n8  
  OnCancel(); A>(EM}\,  
 return FALSE; H)y_[:[  
} rxZk!- t)L  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %:dd#';g  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ;2^zkmDM  
 AddIcon(); 0/cgOP!^  
 return res; 6vzvH  
}  U8% IpI;  
E^~ {thf  
void CCaptureDlg::AddIcon() &]anRT#  
{ (X (:h\^  
 NOTIFYICONDATA data; ]eTp?q%0  
 data.cbSize=sizeof(NOTIFYICONDATA); ol`q7i.  
 CString tip; &?gcnMg$,J  
 tip.LoadString(IDS_ICONTIP); R/2L9Lcv  
 data.hIcon=GetIcon(0); H D,6  
 data.hWnd=GetSafeHwnd(); n"R$b:  
 strcpy(data.szTip,tip); Lf{pTxKr  
 data.uCallbackMessage=IDM_SHELL; h,]lN'JG{  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =YtK@+| i  
 data.uID=98; a(h@4 x  
 Shell_NotifyIcon(NIM_ADD,&data); ':utU1dL  
 ShowWindow(SW_HIDE); +RK/u  
 bTray=TRUE; F(,SnSam  
} xx?0Ftuq  
<YWu/\{KT  
void CCaptureDlg::DeleteIcon() ol_&epG;ST  
{ 3;!a'[W&p  
 NOTIFYICONDATA data; 'OMl9}M  
 data.cbSize=sizeof(NOTIFYICONDATA); SO~pe$c-  
 data.hWnd=GetSafeHwnd(); =s S=  
 data.uID=98; MJK PpQ(,  
 Shell_NotifyIcon(NIM_DELETE,&data); GW]t~EL  
 ShowWindow(SW_SHOW); 6S(`Bw8h  
 SetForegroundWindow(); 5Iv"  
 ShowWindow(SW_SHOWNORMAL); ]0{,P !  
 bTray=FALSE; =E~_F>SD  
} *6v5JH&K  
cc"<H}g>`  
void CCaptureDlg::OnChange() aQso<oK  
{ q"-Vh,8h  
 RegisterHotkey(); FE06,i\{  
} ~0vNs2D,S  
&3*r-9BZ  
BOOL CCaptureDlg::RegisterHotkey() )F0Q2P1I  
{ B\`${O(  
 UpdateData(); cL"Ral-qB  
 UCHAR mask=0; ux[13]yY  
 UCHAR key=0; 'qeUI}[  
 if(m_bControl) YT@H^=  
  mask|=4; (`gqLPx[  
 if(m_bAlt) kc `Q- N}  
  mask|=2; nm 66U4.@  
 if(m_bShift) }NDw3{zn  
  mask|=1; |_HH[s*U  
  key=Key_Table[m_Key.GetCurSel()]; lKEdpF<  
 if(bRegistered){ 9 8bmia&H  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); gPY2Bnw;l  
  bRegistered=FALSE; YS k,kU  
 } <T:u&Ic  
 cMask=mask; ro7\}O:I  
 cKey=key; oUR'gc :  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (Ac ' }O  
 return bRegistered; ZVEq{x1Zc  
} ]1rr$f9  
RUm1;MWs  
  四、小结 Fsv%=E{  
I(ds]E ;_E  
  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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