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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: [ 'aSPA  
  m}`!FaB #  
  一、实现方法 n;QMiz:yY  
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  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: O S?S$y  
dK.k,7R  
#pragma data_seg("shareddata") 4+?d0  
HHOOK hHook =NULL; //钩子句柄 8p"R4  
UINT nHookCount =0; //挂接的程序数目 ~IQ3B $4H&  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 {XR 3L'X  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 7UnB]-:.  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey xQA6!j  
static int KeyCount =0; so=Ux2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 KcPI ,.4{  
#pragma data_seg() Cg#@JuwHa  
T'8d|$X  
  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。 85gdmla@9  
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  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: s\/$`fuhx  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  {@E(p4W  
cKey,UCHAR cMask) S~GL_#a  
{ >tGl7Ov  
 BOOL bAdded=FALSE; &-R(u}m-F  
 for(int index=0;index<MAX_KEY;index++){ 1>)q 5D  
  if(hCallWnd[index]==0){ 7j,u&%om  
   hCallWnd[index]=hWnd; _4^#VD#f  
   HotKey[index]=cKey; .0=VQU  
   HotKeyMask[index]=cMask; mssCnr;  
   bAdded=TRUE; 4C]>{osv  
   KeyCount++; V;@kWE>3  
   break; 'jnR<>N  
  } wg.TCT2  
 } "fH"U1Bw  
 return bAdded; lJ>OuSd  
} n=_jmR1  
//删除热键 `bAOhaB,/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) E=3UaYr  
{ %Bxp !Bj  
 BOOL bRemoved=FALSE; D2N<a=#  
 for(int index=0;index<MAX_KEY;index++){ N Ftmus  
  if(hCallWnd[index]==hWnd){ u*w'.5l  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4s_|6{ANS  
    hCallWnd[index]=NULL; QtSJ9;eP  
    HotKey[index]=0; ZkA05wPZ#  
    HotKeyMask[index]=0; (,P6cWt}"  
    bRemoved=TRUE; .+#<~Jv  
    KeyCount--; 5yl[#>qt  
    break; B QxU~s  
   } u*"mdL2  
  } J}?:\y<  
 } QJ%[6S  
 return bRemoved; -h%!#g  
} z\g6E/%%  
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8 o^ h\9I  
  DLL中的钩子函数如下: | > t,1T.  
]:g;S,{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 09_5niaz[  
{ 'O:QS)  
 BOOL bProcessed=FALSE; x )w6  
 if(HC_ACTION==nCode) 0YsBAfRG  
 { Z23*`yR  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 VC T~"T2R  
   switch(wParam) !8jr $  
   {  N.1 @!\z@@  
    case VK_MENU: ps@;Z ?Q  
     MaskBits&=~ALTBIT; u&-Zh@;Q7  
     break; 'h*^;3@*  
    case VK_CONTROL: .5AyB9a%&  
     MaskBits&=~CTRLBIT; J{w[vcf  
     break; XLq%nVBM8\  
    case VK_SHIFT: Ec4+wRWk85  
     MaskBits&=~SHIFTBIT; y/9aI/O'  
     break; {3H)c^Q  
    default: //judge the key and send message D-KQRe2@  
     break; =G<i6%(^g  
   } IUZ@n0/T  
   for(int index=0;index<MAX_KEY;index++){ K (!+l  
    if(hCallWnd[index]==NULL) ?7k%4~H t  
     continue; kD?lMA__  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a}p}G\b|  
    { :Sc"fG,g)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ZIr&_x#e  
     bProcessed=TRUE; 5vSJjhS  
    } &:@)ro CR  
   } |G(9mnZ1  
  } @!np 0#  
  else if((lParam&0xc000ffff)==1){ //有键按下 "j*{7FBqk  
   switch(wParam) .$~zxd#zo  
   { jM07&o]D  
    case VK_MENU: :=cZ,?PQp1  
     MaskBits|=ALTBIT; c7~>uNgJ  
     break; 4Rv.m* ^B  
    case VK_CONTROL: drkY~!a  
     MaskBits|=CTRLBIT; mSFh*FG  
     break; 9L+g;Js$4  
    case VK_SHIFT: L0QF(:F5  
     MaskBits|=SHIFTBIT; _X/`7!f  
     break; 7FB aN7l  
    default: //judge the key and send message rAwuWM@BIg  
     break; :GBM`f@  
   } hT DFIYV  
   for(int index=0;index<MAX_KEY;index++){ Lbwc2Q,.-  
    if(hCallWnd[index]==NULL) TDY2 M  
     continue; H="E#AC%8/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *Y\C5L ]  
    { 93]67PL#+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =F 9!)r  
     bProcessed=TRUE; }:zTz% _K  
    } ^$VH~i&  
   } m2esVvP  
  } .W*"C  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 WETnrA"N  
   for(int index=0;index<MAX_KEY;index++){ e{RhMjX<D  
    if(hCallWnd[index]==NULL) lHI ;fR  
     continue; nP5T*-~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }Kt1mmo:`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %K/zVYGm&  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Z!eW_""wp  
   } ^Ee"w7XjD  
  } a\]g lw\;  
 } At$[&%}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); I|eYeJ3  
} Mv%"aFC  
E/5/5'gBJO  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: zho$g9*  
,)beK*Iw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +>*! 3x+sE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J&w'0  
+`]AutNv  
  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: #*|Gp_l+%  
/UP1*L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2}<_l 2  
{ kl+^0i  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) !=SBeq  
 { (_.0g}2  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 E#A%aLp0E  
  SaveBmp(); _7=LSf,9  
  return FALSE; P+2@,?9#  
 } L[rxs[7~  
 …… //其它处理及默认处理 !QXPn}q^0  
} {I^@BW-  
DGrk}   
-RKqbfmi=  
  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_.9H _G  
o4F?Rx,L  
  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。 6t!PHA  
5'%nLW7;O  
  二、编程步骤 4mM?RGWv  
S:YQVj  
  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"; dHO8 bYBH  
40$- ]i  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; vp2s)W8W  
,SB5"  
  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; gT0N\oU"  
EZb_8<DH  
  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; *i,@d&J y]  
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  5、 添加代码,编译运行程序。 \iQ{Q &JR:  
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三、程序代码 e,8[fp-7  
3 z~d7J  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6*r#m%|   
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |SSe n#PYp  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #sHt3z)6I  
#if _MSC_VER > 1000 $Si|;j$?  
#pragma once ==]BrhZK  
#endif // _MSC_VER > 1000 &|Cd1z#?  
#ifndef __AFXWIN_H__ $ts1XIK%  
#error include 'stdafx.h' before including this file for PCH Sece#K2J|  
#endif HY>zgf,0  
#include "resource.h" // main symbols ?Jy /]j5fI  
class CHookApp : public CWinApp 5e|yW0o  
{ ,.,spoV  
 public: 4qvE2W}&  
  CHookApp(); 8D:0Vhx\I  
  // Overrides Y:#nk.}>  
  // ClassWizard generated virtual function overrides kT12  
  //{{AFX_VIRTUAL(CHookApp) p"tCMB  
 public: Ra)AQ n  
  virtual BOOL InitInstance(); _/[}PQC6G  
  virtual int ExitInstance(); ,qu7XFYrY  
  //}}AFX_VIRTUAL z;Yo76P  
  //{{AFX_MSG(CHookApp) L{F[>^1Sb  
  // NOTE - the ClassWizard will add and remove member functions here. 155vY  
  // DO NOT EDIT what you see in these blocks of generated code ! F!qt=)V@w  
  //}}AFX_MSG o8c5~fG1  
  DECLARE_MESSAGE_MAP() $az9Fmta  
}; G:4'')T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); @wPyXl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w:HRzU>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \ Dccf_(Pb  
BOOL InitHotkey(); 3](At%ss  
BOOL UnInit(); aNDpCpy  
#endif )l6(ss!J  
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//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. tYUg%2G  
#include "stdafx.h" . /@C  
#include "hook.h" YS0^ !7u  
#include <windowsx.h> 7w5C NV  
#ifdef _DEBUG ';zS0Yk  
#define new DEBUG_NEW PFI^+';  
#undef THIS_FILE %@MO5#)NI  
static char THIS_FILE[] = __FILE__; Lu5lpeSQ  
#endif /H~]5JZ3-E  
#define MAX_KEY 100 }F4%5go  
#define CTRLBIT 0x04 2e^6Od!Y?  
#define ALTBIT 0x02 0@>  
#define SHIFTBIT 0x01 GAU7w"sE  
#pragma data_seg("shareddata") c@|f'V4  
HHOOK hHook =NULL; )zAATBb4.  
UINT nHookCount =0; Wf{&D>  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey )Nt'Z*K*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 2OZ<t@\OY  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey L#MgoBXr  
static int KeyCount =0; 9+"ISXS  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift `;)op3A'  
#pragma data_seg() GV8`.3DBOF  
HINSTANCE hins; =<[M$"S7d6  
void VerifyWindow(); r8,'LZIz  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) XDyFe'1I  
//{{AFX_MSG_MAP(CHookApp) 4WXr~?Vq9  
// NOTE - the ClassWizard will add and remove mapping macros here. TH>7XK<90M  
// DO NOT EDIT what you see in these blocks of generated code! KmpKyc[  
//}}AFX_MSG_MAP zT+ "Z(oz,  
END_MESSAGE_MAP() <[A;i  
PM^Xh*~  
CHookApp::CHookApp() QP7N#mh  
{ OMm'm\+/  
 // TODO: add construction code here, (Qd@Q,@(s  
 // Place all significant initialization in InitInstance auHP^O> 4L  
} 7bL48W<QD  
F@<^  
CHookApp theApp; `N;O6 wZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) CF]#0*MI  
{ ffG1QvC|M  
 BOOL bProcessed=FALSE; cpu|tK.t  
 if(HC_ACTION==nCode) q85 4k+C  
 { b&P2VqYgl  
  if((lParam&0xc0000000)==0xc0000000){// Key up N[&(e d=  
   switch(wParam) U-pBat.$'C  
   { UL0n>Wa5  
    case VK_MENU: iJSyi;l|  
     MaskBits&=~ALTBIT; K`8$+JDP+  
     break; eCwR }m?_  
    case VK_CONTROL: {)wl`mw3  
     MaskBits&=~CTRLBIT; ?o`fX wE  
     break; gr\vC  
    case VK_SHIFT: C)BVsHT4  
     MaskBits&=~SHIFTBIT; ^2LqKo\T  
     break; nVoP:FHH  
    default: //judge the key and send message xG:7AGZ$[  
     break; C] M{  
   } [[ uZCKi  
   for(int index=0;index<MAX_KEY;index++){ UUEbtZH;  
    if(hCallWnd[index]==NULL) j"9Zaq_  
     continue; 1O+$"5H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l 9bg  
    { 4\y>pXML-U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); DAQozhP8  
     bProcessed=TRUE; [E;~Y_l  
    } ;Swj`'7  
   } Voo_ ?  
  } N{?Qkkgx  
  else if((lParam&0xc000ffff)==1){ //Key down ,U=7#Cf!  
   switch(wParam) 1?{w~cF}  
   { O#`y;%  
    case VK_MENU: jBU!xCO  
     MaskBits|=ALTBIT; e_dsBmTh  
     break; Ns6C xE9  
    case VK_CONTROL: nmoC(| r  
     MaskBits|=CTRLBIT; t'*2)U  
     break; /_i]bM7W  
    case VK_SHIFT: $!K,5^+  
     MaskBits|=SHIFTBIT; D)bR-a_^  
     break; ZU.f)94u  
    default: //judge the key and send message `3L?x8g  
     break; Qk8YR5 K   
   } Z4{~  
   for(int index=0;index<MAX_KEY;index++) :tp{(MF  
   { E[M.q;rM  
    if(hCallWnd[index]==NULL) G$1gk^G's  
     continue; W<M\ b#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qhOV>j,d  
    { =po5Q6@i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3$P GLM  
     bProcessed=TRUE; pXf5/u8&  
    } H;Gd  
   } b ix}#M  
  } @pV&{Vp  
  if(!bProcessed){ jN{+$ @cI  
   for(int index=0;index<MAX_KEY;index++){ Rip[  
    if(hCallWnd[index]==NULL) PjkjUP  
     continue; M4K>/-9X+V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  G`NGt_C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 79}Qj7  
   } .`+N+B(4  
  } X-_0wR  
 } yTh60U  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K!;>/3Y2-  
} Kbcr-89Gv~  
O>>%lr|  
BOOL InitHotkey() e@L?jBj8m  
{ %J :2y  
 if(hHook!=NULL){ q@}tv =}  
  nHookCount++; GtkZ%<KF9  
  return TRUE; ^A$p)`KR  
 } J4jL%5t  
 else s` o _ER  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); !KLY*bt6  
  if(hHook!=NULL) H~~>ut6`  
   nHookCount++; -}P/<cu:  
  return (hHook!=NULL); dgW/5g  
} ya'OI P `  
BOOL UnInit() i~.9 B7hdE  
{ XZ_vbYTj  
 if(nHookCount>1){ =QW:},sp  
  nHookCount--;  S/Gy:GIf  
  return TRUE; leO..M  
 } RaAvPIJa |  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 8~vE  
 if(unhooked==TRUE){ k[/`G5  
  nHookCount=0; v:u=.by99  
  hHook=NULL; V,>uM >$  
 } ,{g B$8z^  
 return unhooked; ;(;{~1~  
} pF'M  
zzZ K S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~jM!8]=  
{ Yjix]lUXVf  
 BOOL bAdded=FALSE; X XC(R  
 for(int index=0;index<MAX_KEY;index++){ U[c^xz&  
  if(hCallWnd[index]==0){ jmva0K},SE  
   hCallWnd[index]=hWnd; 99?: 9g  
   HotKey[index]=cKey; P~u~`eH*  
   HotKeyMask[index]=cMask; CO"Nv  
   bAdded=TRUE; kqp*o+Oz',  
   KeyCount++; ~k/GmH  
   break; 8% `Jf`  
  } 3<ry/{#%  
 } w[s}#Q  
 return bAdded; lvIdYf$?  
} @1+({u#B  
OM#eJ,MH<)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Nx<%'-9)|  
{ z#t;n  
 BOOL bRemoved=FALSE; IGcYPL\&  
 for(int index=0;index<MAX_KEY;index++){ Un{9reX5  
  if(hCallWnd[index]==hWnd){ @M8vP H  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [ h~#5x  
    hCallWnd[index]=NULL; T |ZJ$E0  
    HotKey[index]=0; o7t#yw3  
    HotKeyMask[index]=0; }XIUz|  
    bRemoved=TRUE; ^3w >:4m  
    KeyCount--; |f< -lB[k  
    break; HbQ+:B]  
   } #~:@H&f790  
  } o :_'R5  
 } d/&~IR  
 return bRemoved; SMbhJ}\O  
} y<*/\]t9L[  
V"Y-|R  
void VerifyWindow() ^RE("'+  
{ 'U'Y[*m@  
 for(int i=0;i<MAX_KEY;i++){ }?=4pGsI  
  if(hCallWnd!=NULL){ d9yfSZ  
   if(!IsWindow(hCallWnd)){ f>jAu;S  
    hCallWnd=NULL; 0j(/N  
    HotKey=0; ;8> TD&]{  
    HotKeyMask=0; "CF{Mu|Q=  
    KeyCount--; ,-_\Y hY>  
   } /\|Behif  
  } l|'{Cb   
 } 1g bqHxWI  
} -+Ab[  
s.K Hm L3  
BOOL CHookApp::InitInstance() ew\ZFqA;  
{ Q*l_QnfG  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); +!)v=NY  
 hins=AfxGetInstanceHandle(); GN@(!V#/4  
 InitHotkey(); K*fh`Kz  
 return CWinApp::InitInstance(); U8icP+Y  
} o~={M7 m  
$C~OV@I  
int CHookApp::ExitInstance() x /xd  
{ 9ZXEy }q57  
 VerifyWindow(); 3ew`e"s  
 UnInit(); ;-@v1I;  
 return CWinApp::ExitInstance(); q8P$Md-=b1  
} =#sr4T  
Uh8c!CA8:\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "[p-Iy1  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) kSH|+K\M4  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !(-S?*64l  
#if _MSC_VER > 1000 sU 5/c|&  
#pragma once >(39K  
#endif // _MSC_VER > 1000 QzX|c&&>u2  
y759S)U>>p  
class CCaptureDlg : public CDialog B kWoK/f4  
{ 2'5%EQW;0y  
 // Construction 8sGaq [  
 public: *:hHlH* t1  
  BOOL bTray; x,>r}I>^Q  
  BOOL bRegistered; "L~qsFL  
  BOOL RegisterHotkey(); sQ>L3F;A`  
  UCHAR cKey; %W:]OPURK  
  UCHAR cMask; 8^ezqd`  
  void DeleteIcon(); \oc*  
  void AddIcon(); l8Ks{(wh  
  UINT nCount; QeZK&^W  
  void SaveBmp(); v35=4>Y  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ht!]%  
  // Dialog Data S1oP_A[|  
  //{{AFX_DATA(CCaptureDlg) yp.\KLq8)  
  enum { IDD = IDD_CAPTURE_DIALOG }; UA]U_P$c  
  CComboBox m_Key; Jx_BjkF  
  BOOL m_bControl; s6| S#  
  BOOL m_bAlt; y?*4SLy  
  BOOL m_bShift; MH=;[| N  
  CString m_Path; Zcg@]Sx(I  
  CString m_Number; K84Ve Ae  
  //}}AFX_DATA v6q oH)n  
  // ClassWizard generated virtual function overrides 'k?*?XxG  
  //{{AFX_VIRTUAL(CCaptureDlg) o9#8q_D9  
 public: R@Kzdeo  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2%*mL98WK  
 protected: YqSkz|o}m  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -kI;yL  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); U";8zplU  
  //}}AFX_VIRTUAL ,ThN/GkSC  
  // Implementation ;u "BCW  
 protected: T0=%RID%=  
  HICON m_hIcon; E ) iEWc  
  // Generated message map functions |SfmQ;  
  //{{AFX_MSG(CCaptureDlg) 9et%Hn.K'  
  virtual BOOL OnInitDialog(); N5\]VCX  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @XR N#_{  
  afx_msg void OnPaint(); iR(jCD?) Y  
  afx_msg HCURSOR OnQueryDragIcon(); ,/ bv3pE  
  virtual void OnCancel(); F2 #s^4Ii  
  afx_msg void OnAbout(); >;}q  
  afx_msg void OnBrowse(); U#=5HzE  
  afx_msg void OnChange(); m0zbG1OE  
 //}}AFX_MSG `rLy7\@;  
 DECLARE_MESSAGE_MAP() -AcVVK&  
}; cgevP`*]  
#endif Y~%9TC  
oe*Y(T\G  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 27q=~R}  
#include "stdafx.h" W|e$@u9  
#include "Capture.h" 6o4Bf| E]  
#include "CaptureDlg.h" 5h6c W  
#include <windowsx.h> y-i6StJ  
#pragma comment(lib,"hook.lib") eW>Y*l% B  
#ifdef _DEBUG  a8wQ ,  
#define new DEBUG_NEW m^M sp:T,  
#undef THIS_FILE +#a_Y  
static char THIS_FILE[] = __FILE__; \Q m1+tg  
#endif />,KWHR|:  
#define IDM_SHELL WM_USER+1 12JmSvD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x%d\}%]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XFv)]_G  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s}5,<|DL  
class CAboutDlg : public CDialog CV )v6f  
{ VA^yv1We  
 public: [9U: :  
  CAboutDlg(); 0V_dg |.  
  // Dialog Data 6mAaFDI,R  
  //{{AFX_DATA(CAboutDlg) +P5\N,,7R  
  enum { IDD = IDD_ABOUTBOX }; e[)oT  
  //}}AFX_DATA yRF %SWO  
  // ClassWizard generated virtual function overrides {InD/l'v6n  
  //{{AFX_VIRTUAL(CAboutDlg) ap y#8]  
 protected: XD=p:Ezh  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 'l7ey3B%  
  //}}AFX_VIRTUAL 4gkaCk{]  
  // Implementation U.,_zEbx,  
 protected: 6< T@\E  
  //{{AFX_MSG(CAboutDlg) +i0j3.  
  //}}AFX_MSG 8pZGu8  
  DECLARE_MESSAGE_MAP() lUJ~_`D  
}; u{+z?N  
wYLi4jYm  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4ZAnq{nR4  
{ uKL4cr@  
 //{{AFX_DATA_INIT(CAboutDlg) @j/|U04_ Z  
 //}}AFX_DATA_INIT .Fe_Z)i>h  
} [W#M(`}D  
: 3 aZ_  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R$Or&:E ^  
{ K#>@T<  
 CDialog::DoDataExchange(pDX); Y_SB3 $])  
 //{{AFX_DATA_MAP(CAboutDlg) (0W)Jd[  
 //}}AFX_DATA_MAP Pv#>j\OR&  
} Un.u{$po  
lc qpwSk  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) V9dJNt'Ui  
 //{{AFX_MSG_MAP(CAboutDlg) 41Nm+$m  
 // No message handlers zD z"Dn9  
 //}}AFX_MSG_MAP jM%8h$&E  
END_MESSAGE_MAP() %Xfy.v  
{I:nza  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) zlhHSyK  
: CDialog(CCaptureDlg::IDD, pParent) Q`{2 yU:r  
{ c ?(X(FQ  
 //{{AFX_DATA_INIT(CCaptureDlg) 2iV/?.<Z&  
  m_bControl = FALSE; b\9MM  
  m_bAlt = FALSE; o NqIrYH'  
  m_bShift = FALSE; h:3^FV&#  
  m_Path = _T("c:\\"); :)eU)r"s4  
  m_Number = _T("0 picture captured."); B65"jy  
  nCount=0; ~( ~ y=M  
  bRegistered=FALSE; WPpS?  
  bTray=FALSE; _ \LP P_  
 //}}AFX_DATA_INIT t 8,VRFV  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &]_2tN=S$  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); lv=rL  
} =(cfo_B@K  
7(W"NF{r  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %m5&Y01  
{ r 1x2)  
 CDialog::DoDataExchange(pDX); $FM: 8^  
 //{{AFX_DATA_MAP(CCaptureDlg) A]_5O8<buW  
  DDX_Control(pDX, IDC_KEY, m_Key); G%#M17   
  DDX_Check(pDX, IDC_CONTROL, m_bControl); /ho7O/aAa  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ;T,`m^@zf  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); A/A; '9  
  DDX_Text(pDX, IDC_PATH, m_Path);  Bl1^\[#  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4u}jkd$]*  
 //}}AFX_DATA_MAP W0qn$H  
} >5c38D7k)  
?Zv>4+Y'  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =f\BAi  
//{{AFX_MSG_MAP(CCaptureDlg) E WNm }C9  
 ON_WM_SYSCOMMAND() :|PI_ $4H  
 ON_WM_PAINT() t8_i[Hw6D  
 ON_WM_QUERYDRAGICON() f~ -qjEWm  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .;,` bH0  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) g* DBW,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 3@8Zy:[8<  
//}}AFX_MSG_MAP (\o &Gl  
END_MESSAGE_MAP() <#%kmYSL  
CjT]!D)s  
BOOL CCaptureDlg::OnInitDialog() 3^-yw`  
{ f C_H0h3  
 CDialog::OnInitDialog(); H5X.CcI&}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); O Zn40"`  
 ASSERT(IDM_ABOUTBOX < 0xF000); l`(pV ;{W  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ';iLk[  
 if (pSysMenu != NULL) ,he1WjL  
 { Ca k-J~=  
  CString strAboutMenu; trm-&e7q?;  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 7:Be.(a  
  if (!strAboutMenu.IsEmpty()) G+V?c1Me  
  { \yKYBfp-p  
   pSysMenu->AppendMenu(MF_SEPARATOR); ?j|i|WUD  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >m'n#=yap  
  } s.j6" Q[W  
 } ywkyxt  
 SetIcon(m_hIcon, TRUE); // Set big icon {O"N2W  
 SetIcon(m_hIcon, FALSE); // Set small icon oF {u  
 m_Key.SetCurSel(0); & T&>4I!'M  
 RegisterHotkey(); g), t  
 CMenu* pMenu=GetSystemMenu(FALSE); O&@pi-=o  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ay`A Gr  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); qx2M"uFJ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); R Y ";SfYb  
 return TRUE; // return TRUE unless you set the focus to a control 6 ~.{~+Bd  
} B82SAV/O  
>4iVVs  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) _sX@BE  
{ JK9 J;c#T  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) fj:q_P67o  
 { ,cCBAO ueO  
  CAboutDlg dlgAbout; >#EOCo  
  dlgAbout.DoModal(); ['JIMcD  
 } I6lWB(H!u  
 else n1r'Y;G  
 { JS#AoPWA  
  CDialog::OnSysCommand(nID, lParam); _4-UM2o;  
 } 0*F<tg,+]  
} 3#Qek2  
p|RFpn2ygF  
void CCaptureDlg::OnPaint() 6X[Mn2wYW  
{ rGUu K0L&  
 if (IsIconic()) <&MY/vV  
 { F*J@OY8i  
  CPaintDC dc(this); // device context for painting z( ^ r  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8/BWe ;4  
  // Center icon in client rectangle !63]t?QXMG  
  int cxIcon = GetSystemMetrics(SM_CXICON); owKOH{otf  
  int cyIcon = GetSystemMetrics(SM_CYICON); +LB2V3UZ  
  CRect rect; Q1^kU0M}  
  GetClientRect(&rect); MR}h}JEx0  
  int x = (rect.Width() - cxIcon + 1) / 2; cVuT|b^  
  int y = (rect.Height() - cyIcon + 1) / 2; 9`Zwa_Tni  
  // Draw the icon Z>(K|3_  
  dc.DrawIcon(x, y, m_hIcon); j7sRmQCl  
 } @D+2dT0[M  
 else gvCQ![  
 { $c1xh.  
  CDialog::OnPaint(); =.\PG [  
 } +Vw]DLWR  
} Y |'}VU  
6O| rI>D  
HCURSOR CCaptureDlg::OnQueryDragIcon() wS @-EcCB  
{ Cu`ty] -'  
 return (HCURSOR) m_hIcon; [I2vg<my  
} YLehY  
T))F r:  
void CCaptureDlg::OnCancel() K6G+sBw[  
{ Qa@] sWcM  
 if(bTray) x03@}M1  
  DeleteIcon(); =BroH\  
  CDialog::OnCancel(); 2 i97  
} <}('w/  
%shCqS  
void CCaptureDlg::OnAbout() 4o ,G[Cf_  
{ k4+Q$3"  
 CAboutDlg dlg; Ux+UcBKm-  
 dlg.DoModal(); B'8T+qvA  
} 91\]Dg  
M&J$9X  
void CCaptureDlg::OnBrowse() 'h3yxf}\  
{ r O-=):2  
 CString str; u`Abko<D  
 BROWSEINFO bi; ':#DROe!  
 char name[MAX_PATH]; :)DvZxHE@  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ^ RIWW0  
 bi.hwndOwner=GetSafeHwnd(); S:{`eDk\A_  
 bi.pszDisplayName=name; qt`HP3J&  
 bi.lpszTitle="Select folder"; |<!xD iB  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; !~ fy".|x  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6YF<GF{  
 if(idl==NULL) F42?h:y8I  
  return; QQ\\:]iM  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ,?(U4pzX  
 str.ReleaseBuffer(); V|j{#;  
 m_Path=str; .M([n-  
 if(str.GetAt(str.GetLength()-1)!='\\') BXa.XZ<n(  
  m_Path+="\\"; v%E~sX&CG  
 UpdateData(FALSE); @~C C$Y$  
} ,&iZ*6=X?0  
o@uZU4MM  
void CCaptureDlg::SaveBmp() n0%5mTUN  
{ g[ O6WZ!F_  
 CDC dc;  4 `]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); $8WeWmY  
 CBitmap bm; Rg%Xy`gS  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3S{3AmKj?  
 int Height=GetSystemMetrics(SM_CYSCREEN); Hh`HMa'q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); C8AR ^F W  
 CDC tdc; T07 AH  
 tdc.CreateCompatibleDC(&dc); *^i"q\n5(  
 CBitmap*pOld=tdc.SelectObject(&bm); 1HBWOV7z.?  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); bEB9J- Q  
 tdc.SelectObject(pOld); +O!4~k^  
 BITMAP btm; 8 Az|SJ<  
 bm.GetBitmap(&btm); {Y1&GO;  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 9"cyZO  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); a Juv{  
 BITMAPINFOHEADER bih; @Zw[LIQ*  
 bih.biBitCount=btm.bmBitsPixel; mu$rG3M  
 bih.biClrImportant=0; fR#W#n#m  
 bih.biClrUsed=0; K:54`UJ  
 bih.biCompression=0; v(~EO(n.  
 bih.biHeight=btm.bmHeight; rp,Us#>6  
 bih.biPlanes=1; NuR3]Ja\0  
 bih.biSize=sizeof(BITMAPINFOHEADER); tOxTiaa=  
 bih.biSizeImage=size; >9,:i)m_  
 bih.biWidth=btm.bmWidth; c!]Q0ib6  
 bih.biXPelsPerMeter=0; yM# %UeZ\  
 bih.biYPelsPerMeter=0; i0'g$  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); oq[r+E-]$@  
 static int filecount=0; 46gDoSS  
 CString name; (N?nOOQ  
 name.Format("pict%04d.bmp",filecount++); 79Ur1-]/  
 name=m_Path+name; 7}puj%JS /  
 BITMAPFILEHEADER bfh; tu6<>  
 bfh.bfReserved1=bfh.bfReserved2=0; <6.?:Jj  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 4P}d/w?'KL  
 bfh.bfSize=54+size; y/;DA=  
 bfh.bfOffBits=54; :4[_&]H  
 CFile bf; Qt.|YB8  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1^tM%2rP'  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); OXS.CFZM  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); jKb4d9aX  
  bf.WriteHuge(lpData,size); eqk.+~^  
  bf.Close(); FB2{qG3  
  nCount++; Wn&9R j  
 } ZwM d 22  
 GlobalFreePtr(lpData); 3u/ GrsF  
 if(nCount==1) 2?kVbF  
  m_Number.Format("%d picture captured.",nCount); D*t[5,~j  
 else Zx^R-9  
  m_Number.Format("%d pictures captured.",nCount); gdkHaLL"  
  UpdateData(FALSE); *0x!C8*`Xe  
} =55V<VI  
e, }{$HStZ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) d#|%h] 6  
{ G6pR?K+  
 if(pMsg -> message == WM_KEYDOWN) DWupLJpk;c  
 { +do* C =z  
  if(pMsg -> wParam == VK_ESCAPE)  GjyTM  
   return TRUE; ~~}8D"  
  if(pMsg -> wParam == VK_RETURN) ]T._TZ"  
   return TRUE; %e+{wU}w?2  
 } E&>;a!0b]  
 return CDialog::PreTranslateMessage(pMsg); L~*nI d  
} T@mYHKu  
NL&![;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) TGuCIc0B{  
{ t(1gJZs>kX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 00pe4^U  
  SaveBmp(); x\8gb#8  
  return FALSE; th}&|Y)T2  
} W/.Wp|C}K3  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2/ejU,S  
 CMenu pop; y=zs6HaS  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); "qoJIwl#q  
 CMenu*pMenu=pop.GetSubMenu(0); IwR=@Ne8  
 pMenu->SetDefaultItem(ID_EXITICON); O)c3Lm-w  
 CPoint pt; o.wXaS8  
 GetCursorPos(&pt); WF-^pfRq~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); I].ddR%  
 if(id==ID_EXITICON) (5kL6d2  
  DeleteIcon(); &/?OP)N,}  
 else if(id==ID_EXIT) kW& zkE{  
  OnCancel(); ~!6 I.u  
 return FALSE; [ nLd>2P  
} oxLO[js  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); x LGMN)@r  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) wlpcuz@  
 AddIcon(); 0s6eF+bs  
 return res; ]L?WC  
} |Elz{i-  
74a k|(!  
void CCaptureDlg::AddIcon() * yGlX[  
{ u. 2^t :A  
 NOTIFYICONDATA data; ?ZYj5[op,H  
 data.cbSize=sizeof(NOTIFYICONDATA); AmK g;9LS  
 CString tip; k#G+<7c<  
 tip.LoadString(IDS_ICONTIP); *~^%s +b  
 data.hIcon=GetIcon(0); rBZ00}  
 data.hWnd=GetSafeHwnd(); vy5I#q(k  
 strcpy(data.szTip,tip); ~*L@|?  
 data.uCallbackMessage=IDM_SHELL; l"%WXi"X  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |#EI(W?`  
 data.uID=98; B-V   
 Shell_NotifyIcon(NIM_ADD,&data); jF-0fK;)*  
 ShowWindow(SW_HIDE); c3*9{Il^  
 bTray=TRUE; J]|S0JC`  
} 3iw. yR  
S*%:ID|/C2  
void CCaptureDlg::DeleteIcon() rd^j<  
{ S"/gZfxer  
 NOTIFYICONDATA data; :Yn{:%p  
 data.cbSize=sizeof(NOTIFYICONDATA); pIY3ft\  
 data.hWnd=GetSafeHwnd(); hA+;eXy/  
 data.uID=98; tDtqTB}  
 Shell_NotifyIcon(NIM_DELETE,&data); Qm4cuV-0{  
 ShowWindow(SW_SHOW); (, $Lp0mB7  
 SetForegroundWindow(); n +dRAIqB  
 ShowWindow(SW_SHOWNORMAL); BR tT 7  
 bTray=FALSE; xLw[ aYy4  
} vqo ~?9z[e  
:-~x~ah-  
void CCaptureDlg::OnChange() KJ_L>$ ]*  
{ |UN#utw{^Y  
 RegisterHotkey(); A/.z. K  
} >Sm#-4B-  
*2Q x69`  
BOOL CCaptureDlg::RegisterHotkey() *-gmWATC6  
{ `tm(3pJ  
 UpdateData(); Y^gIvX  
 UCHAR mask=0; ]#dZLm_  
 UCHAR key=0; q,]57s  
 if(m_bControl) P7!gUxcv9Y  
  mask|=4; uKo4nXVtp  
 if(m_bAlt) mWuhXY^Q  
  mask|=2; D1EHT}  
 if(m_bShift) t}gK)"g  
  mask|=1; Pcr;+'q  
  key=Key_Table[m_Key.GetCurSel()]; <9`/Y"\p  
 if(bRegistered){ aq8mD^j-&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~AR0 ,lak  
  bRegistered=FALSE; Q#Xa]A-  
 } o+?Ko=vYw  
 cMask=mask; qGgdWDn`  
 cKey=key; 8\[qR_LV  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); _RX*Ps=  
 return bRegistered; D66!C{  
} rm,h\  
; .hTfxE0  
  四、小结 )`zfDio-1V  
||.Ve,<:  
  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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