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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: ^F_c'  
  7TlOF  
  一、实现方法 !WAbO(l  
lKwIlp  
  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: OBu$T&  
'Kc;~a  
#pragma data_seg("shareddata") _AK-AY  
HHOOK hHook =NULL; //钩子句柄 (AV j_Cw  
UINT nHookCount =0; //挂接的程序数目  rf oLg  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 gh3_})8c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 8BBuYY {  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 02?y%  
static int KeyCount =0; &@nI(PXv  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 8*6U4R  
#pragma data_seg() ~#O nA1)  
<Y<%=`  
  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。 ".~,(*  
| [P!9e  
  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: C+jlIT+  
N9idk}T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR O*T(aM3r  
cKey,UCHAR cMask) ,D;d#fJ  
{ Pe~[qETv  
 BOOL bAdded=FALSE; X`#vH8  
 for(int index=0;index<MAX_KEY;index++){ l g~Gkd6  
  if(hCallWnd[index]==0){ -PoW56  
   hCallWnd[index]=hWnd; _-^a8F>/19  
   HotKey[index]=cKey; eY;XF.mF  
   HotKeyMask[index]=cMask; t 8|i>(O  
   bAdded=TRUE; D8G5,s-.  
   KeyCount++; ;MR8E9  
   break; 3hGYNlQ^  
  } (jtrQob  
 } ;",W&HQbE  
 return bAdded; GK~uoz:^O  
} t#=W'HyW8  
//删除热键 |!,;IoZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1F{c5  
{ SwXVa/9a"  
 BOOL bRemoved=FALSE; ? 0p_/mZ  
 for(int index=0;index<MAX_KEY;index++){ ,F!zZNW9  
  if(hCallWnd[index]==hWnd){ EWrIDZi  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3c}@_Yn  
    hCallWnd[index]=NULL; fl9`Mgu  
    HotKey[index]=0; 3fM8W> *7  
    HotKeyMask[index]=0; I w~R@,  
    bRemoved=TRUE; WB K6Ug  
    KeyCount--; BF b<"!Y  
    break; T]HeS(  
   } "A6m-xE~  
  } QVJq%P  
 } +0_e a~{  
 return bRemoved; oIrO%v:'!  
} lK 5@qG#  
SYkwM6  
s'b 4Me  
  DLL中的钩子函数如下: UQ c!"D  
FC@h6 \+a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?(0=+o(`  
{ ($'W(DH4  
 BOOL bProcessed=FALSE; 2RG6m=Y8y  
 if(HC_ACTION==nCode) ~G,_4}#"pM  
 { X|y(B%:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 vJ9I z  
   switch(wParam) Vdd HK  
   {  d<K2 \:P{}  
    case VK_MENU: R-LMV  
     MaskBits&=~ALTBIT; ( RO-~-  
     break; 70Jx[3vr  
    case VK_CONTROL: & %A&&XT9  
     MaskBits&=~CTRLBIT; !mHMFwvS  
     break; eu={6/O  
    case VK_SHIFT: `Y O(C<r-  
     MaskBits&=~SHIFTBIT; Pm&hv*D  
     break; & 6'Rc#\P  
    default: //judge the key and send message sPX&XqWx  
     break; ,.9k)\/V  
   } }C4wED.  
   for(int index=0;index<MAX_KEY;index++){ s|IY t^  
    if(hCallWnd[index]==NULL) Znr@-=xZO*  
     continue; 5C0![ $W>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) iR?}^|]  
    { 6S`0<Z;;/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~=va<%{ U  
     bProcessed=TRUE; VWq]w5oQO  
    } ' _d4[Olu  
   } o1`\*]A7J  
  } I+=+ ,iXhB  
  else if((lParam&0xc000ffff)==1){ //有键按下 b:Z&;A|"{  
   switch(wParam) A:y HClmn  
   { y+3+iT@i  
    case VK_MENU: E75/EQ5p]p  
     MaskBits|=ALTBIT; 3ew4QPT'  
     break; [?%q,>F  
    case VK_CONTROL: >)F "lR:o  
     MaskBits|=CTRLBIT; is }>+&_  
     break; ]Hp>~Zvbb  
    case VK_SHIFT: G/*;h,NbNr  
     MaskBits|=SHIFTBIT; DA1?M'N  
     break; .7]P-]uOZ  
    default: //judge the key and send message o?Aj6fNY?  
     break; Z1#u&oX  
   } ~8s2p%~  
   for(int index=0;index<MAX_KEY;index++){ <d @9[]  
    if(hCallWnd[index]==NULL) CP~mKmMV  
     continue; &&nbdu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ve2{;`t  
    { 2n)?)w]!M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); p^CTHk_|  
     bProcessed=TRUE; #x;,RPw5  
    } 84vd~Cf 9  
   } aaP_^m O  
  } wBcoh~ (y  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 K+pVRDRcs  
   for(int index=0;index<MAX_KEY;index++){ yQuL[#p  
    if(hCallWnd[index]==NULL) 6<2H 7'  
     continue; 9w$m\nV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3pg=9*{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *,mI=1  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 AHRJ7l;a  
   } |>yWkq   
  } 8l_M 0F ,  
 } J$Z=`=] t+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2]1u0-M5L  
} }x?F53I)  
h%:rJ_#Zl  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 4;fuS_(X  
CHsg2S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >!6|yk`GJ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U@M3.[jw  
w8XCU> |  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: In?=$_p  
;I&VpAPx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Nai5!_'  
{ ?u|@,tQ[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) CJ* D  
 { _Z23lF 9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $c9-Q+pZ  
  SaveBmp(); XEgJ7h_  
  return FALSE; VGmvfhf#"  
 } r/2= nE  
 …… //其它处理及默认处理 5?lc%,-&  
} 7~SwNt,  
0?<#!  
F}5d>nw  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 6Q^~O*cw  
V&w2pp0  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 I|U'@E  
.E<nQWz 8  
  二、编程步骤 gxN>q4z  
L-T,[;bl  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; DcW?L^Mst  
Ut;`6t  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; HwFX,?  
Iko]c_W0  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; VG);om7`PD  
g w" \pD  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; N-gYamlQ  
fbNzRXw  
  5、 添加代码,编译运行程序。 !R=@Nr>  
gv''A"  
三、程序代码 unLhI0XW  
/' + >/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL j{@6y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Mf1(4F  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Ks-$:~?5":  
#if _MSC_VER > 1000 j,.\QwpU  
#pragma once u= NLR\  
#endif // _MSC_VER > 1000 Ax;=Zh<DAv  
#ifndef __AFXWIN_H__ 1z? }'&:  
#error include 'stdafx.h' before including this file for PCH T.4&P#a1  
#endif m1l6QcT1  
#include "resource.h" // main symbols p+;& Gg54  
class CHookApp : public CWinApp f8Iddm#  
{ p+ CUYo(  
 public: iRzFA!wH  
  CHookApp(); <s9?9^!!V^  
  // Overrides cJ;Nh>ey  
  // ClassWizard generated virtual function overrides Jsz!ro  
  //{{AFX_VIRTUAL(CHookApp) Z!)~?<gcq:  
 public: n t}7|h|  
  virtual BOOL InitInstance(); p;O%W@n"  
  virtual int ExitInstance(); UFG_ZoD+  
  //}}AFX_VIRTUAL uu9M}]mDl  
  //{{AFX_MSG(CHookApp) yD7BZI xW  
  // NOTE - the ClassWizard will add and remove member functions here. i[o 2(d,  
  // DO NOT EDIT what you see in these blocks of generated code ! nlwqSXw  
  //}}AFX_MSG vADiW~^Q^  
  DECLARE_MESSAGE_MAP() \D7bTn  
}; X@rA2);6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~HZdIPcC  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5*AXL .2ih  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n HseA  
BOOL InitHotkey(); OT9]{|7  
BOOL UnInit(); rtV`Q[E  
#endif KK){/I=z  
&mwd0%4  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. E/P~HE{  
#include "stdafx.h" O>~,RI!  
#include "hook.h" <+`%=r)4  
#include <windowsx.h> .%zcm  
#ifdef _DEBUG =V^-@ji)b  
#define new DEBUG_NEW l8\UO<^fY  
#undef THIS_FILE \|]mClj#  
static char THIS_FILE[] = __FILE__; C=: <[_m`  
#endif VdLoi\-/L  
#define MAX_KEY 100 H@Dpht>[  
#define CTRLBIT 0x04 T@ c~ql  
#define ALTBIT 0x02 0 j.K?]f)h  
#define SHIFTBIT 0x01 E}@C4pS  
#pragma data_seg("shareddata") " kDiK`i  
HHOOK hHook =NULL; J2YQdCL  
UINT nHookCount =0; z3o i(  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 3k Ci5C  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT fB+L%+mr8  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey y&/IJst&aq  
static int KeyCount =0; t" .Ytz>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift BVQy@:K/  
#pragma data_seg() D(!^$9e9b  
HINSTANCE hins; p4`1^}f&Ie  
void VerifyWindow(); o NtFYY  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  : T*Q2  
//{{AFX_MSG_MAP(CHookApp) #9vC]Gm  
// NOTE - the ClassWizard will add and remove mapping macros here. Shm> r@C?  
// DO NOT EDIT what you see in these blocks of generated code! / ^.|m3  
//}}AFX_MSG_MAP (WM3(US|  
END_MESSAGE_MAP() aurs~  
vg z`+Zj*S  
CHookApp::CHookApp() "y1Iu   
{ |=?#Xbxz  
 // TODO: add construction code here, NAbVH{*\U  
 // Place all significant initialization in InitInstance asT-=p_ 0.  
} oQ!M+sRmF  
N[%u>!  
CHookApp theApp; T$4{fhV \  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) S c)^k  
{ _?{7%(C  
 BOOL bProcessed=FALSE; JK k0f9)  
 if(HC_ACTION==nCode) C?PQ>Q!f-  
 { Z_d"<k}I  
  if((lParam&0xc0000000)==0xc0000000){// Key up ;_<R +w3-  
   switch(wParam) uO?+vYAN  
   { {o=?@$6C  
    case VK_MENU: NGx3f3 9  
     MaskBits&=~ALTBIT; 6TtB3;5  
     break; 8nz({Mb9Z  
    case VK_CONTROL: U{U"%XdO  
     MaskBits&=~CTRLBIT; Q;M\fBQO}&  
     break; ?,} u6tH  
    case VK_SHIFT: TT$A o  
     MaskBits&=~SHIFTBIT; ys[Li.s:  
     break; :^;c(>u{  
    default: //judge the key and send message R.~[$G!  
     break; odRiCiMH  
   } 9!FX *}dC  
   for(int index=0;index<MAX_KEY;index++){ !jCgTo y  
    if(hCallWnd[index]==NULL) )vp0X\3q`  
     continue; S,Y|;p<+^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) NvR{S /Z  
    { $TQhr#C]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -yqsJGY  
     bProcessed=TRUE; |)-kUu  
    } j8Z,:op  
   } U1RU2M]v  
  } Q$jEmmm%V[  
  else if((lParam&0xc000ffff)==1){ //Key down Dk1& <} I  
   switch(wParam) L@}PW)#  
   { 7)66e  
    case VK_MENU: 0-2|(9 Kc  
     MaskBits|=ALTBIT; ,:_c-d#  
     break; h$cm:uks  
    case VK_CONTROL: R4?>C-;  
     MaskBits|=CTRLBIT; 7|rH9Bc{U  
     break; tne_]+  
    case VK_SHIFT: sZ;|NAx)  
     MaskBits|=SHIFTBIT; h ><Sp*z_V  
     break; E$8JrL  
    default: //judge the key and send message mx c)Wm<4  
     break; Q7%4`_$!  
   } kfy!T rf  
   for(int index=0;index<MAX_KEY;index++) 6Q.S  
   { .l}Ap7@  
    if(hCallWnd[index]==NULL) H4/wO  
     continue; _|k$[^ln^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \Mf>X\}  
    { PEMkx"h +  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9 {4yC9Oz>  
     bProcessed=TRUE; G6SgVaM  
    } )rc!irac]  
   } ?gH[la  
  } tUn >=>cWP  
  if(!bProcessed){ Q eeV<  
   for(int index=0;index<MAX_KEY;index++){ "wUIsuG/p  
    if(hCallWnd[index]==NULL) pYr"3BwG  
     continue; J<) qw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) k,h602(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); d {z[46>  
   } jhu &Wh  
  } `lf_wB+I  
 } -,bFGTvYQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); '&>"`q  
} , X5.|9  
1.hWgWDP  
BOOL InitHotkey() exRw, Nk4  
{ 7DB_Z /uU  
 if(hHook!=NULL){ 'yo@5*x7  
  nHookCount++; FX:`7c]:9  
  return TRUE; #]#9Xq  
 } x*7@b8J  
 else <_?zln:4.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); j,IRUx13f  
  if(hHook!=NULL) !MbzFs~  
   nHookCount++; Hv,|XE@Y  
  return (hHook!=NULL); Ufr@j` *  
} pR0[qsQM  
BOOL UnInit() ?R`S-  
{ QcegT/vO  
 if(nHookCount>1){ WBe0^=x  
  nHookCount--; FO{=^I5YA  
  return TRUE; 1 ZdB6U0  
 } PKm|?kn{0(  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $l.*;h*  
 if(unhooked==TRUE){ r )|3MUj  
  nHookCount=0; i~B?p[  
  hHook=NULL; 8}/DD^M  
 } r(,U{bU<  
 return unhooked; HC`0Ni1  
} sXLW';Fz  
>.:+|Br`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n@p]v*  
{ }{0}$#z u  
 BOOL bAdded=FALSE; F72#vS j  
 for(int index=0;index<MAX_KEY;index++){ So%X(, |  
  if(hCallWnd[index]==0){ fN vQ.;  
   hCallWnd[index]=hWnd; RTtKf i}  
   HotKey[index]=cKey; C{)1#<`  
   HotKeyMask[index]=cMask; C6+ 5G-Z  
   bAdded=TRUE; O\}C`CiC  
   KeyCount++; yD[d%w  
   break; Cq5.gkS<  
  } Mf5j'n  
 } kHM Jh~  
 return bAdded; ]m1fo'  
} 0uy'Py@2<  
# :+Nr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Y,]Lk<Hm3  
{ _~FfG!H ^X  
 BOOL bRemoved=FALSE; ?0qVyK_1  
 for(int index=0;index<MAX_KEY;index++){ #qRoTtMq 7  
  if(hCallWnd[index]==hWnd){ U~G7~L &m  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "8za'@D"f  
    hCallWnd[index]=NULL; D%>Bj>xQD  
    HotKey[index]=0; 6)[moR{N1  
    HotKeyMask[index]=0; Iu'9yb  
    bRemoved=TRUE; <,vIN,Kl8/  
    KeyCount--; f-U zFlU  
    break; Ku5||u.F4*  
   } X'A`" }=_  
  } lg^'/8^f  
 } r[9m-#)>  
 return bRemoved; v>X!/if<y  
} EEe$A?a;  
DYX{v`>f^  
void VerifyWindow() .ARYCTyG  
{ y4\X~5kU  
 for(int i=0;i<MAX_KEY;i++){ iSfRJ:_&6  
  if(hCallWnd!=NULL){ S!K<kn`E3  
   if(!IsWindow(hCallWnd)){ U1\EwBK8*T  
    hCallWnd=NULL; 3Tr,waV  
    HotKey=0; ammi4k/  
    HotKeyMask=0; fe .=Z&  
    KeyCount--; c!w[)>v  
   } '1u?-2  
  } i?L=8+9f  
 } ,%!m%+K9a  
} VH7t^fb  
UiU/p  
BOOL CHookApp::InitInstance() C T~6T&'  
{ (g6e5Sgi>  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "LlpZtw  
 hins=AfxGetInstanceHandle(); >Eh U{@Y  
 InitHotkey(); s.M39W?  
 return CWinApp::InitInstance(); p.:651b  
} wm@m(ArE=  
5Fydh0.  
int CHookApp::ExitInstance() @ZEBtM%.O  
{ =DwLNyjU4  
 VerifyWindow(); 'O a3 6@  
 UnInit(); gUiO66#x  
 return CWinApp::ExitInstance(); 082}=Tsx   
} Xj, %t}  
nD i^s{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [^!SkQ  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :.PA(97x b  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ V#G)w~   
#if _MSC_VER > 1000 <4{m99  
#pragma once z|s(D<*w  
#endif // _MSC_VER > 1000 @$slGY  
&5 7c !)  
class CCaptureDlg : public CDialog aEf3hB*~  
{ fW = N  
 // Construction p22AH%  
 public: x,n l PU  
  BOOL bTray; LhG\)>Y%  
  BOOL bRegistered; {S0-y  
  BOOL RegisterHotkey(); av'DyNW\  
  UCHAR cKey; CU=sQfE  
  UCHAR cMask; D5gj*/"  
  void DeleteIcon(); $f@YQN=  
  void AddIcon(); ?N4FB*x  
  UINT nCount; .!q_jl%U  
  void SaveBmp(); coCT]<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Kp7D I0~  
  // Dialog Data Kebr>t8^  
  //{{AFX_DATA(CCaptureDlg) hpf0fU  
  enum { IDD = IDD_CAPTURE_DIALOG }; loA/d  
  CComboBox m_Key; <NZPLo F  
  BOOL m_bControl; #7;?Ls  
  BOOL m_bAlt; cvcZ\y  
  BOOL m_bShift; &mX_\w /%  
  CString m_Path; 8K4^05*S   
  CString m_Number; *+v*VH  
  //}}AFX_DATA I<}% L V  
  // ClassWizard generated virtual function overrides lIyMNw  
  //{{AFX_VIRTUAL(CCaptureDlg) 9L$OSy|  
 public: tR51Pw  
  virtual BOOL PreTranslateMessage(MSG* pMsg); GR|\OJ<2  
 protected: ~d7t\S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2l?^\9&  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); iM!Ya!  
  //}}AFX_VIRTUAL b}TvQ+W]2  
  // Implementation v4e4,Nt  
 protected:  Z 9:  
  HICON m_hIcon; -k + jMH  
  // Generated message map functions ; gBR~W  
  //{{AFX_MSG(CCaptureDlg) &G2&OFAr]q  
  virtual BOOL OnInitDialog(); cr;:5D%_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Kyx9_2  
  afx_msg void OnPaint(); +-tFgXG  
  afx_msg HCURSOR OnQueryDragIcon(); Cl '$*h  
  virtual void OnCancel(); ]QlW{J  
  afx_msg void OnAbout(); *I :c@iCNJ  
  afx_msg void OnBrowse(); 7V%P  
  afx_msg void OnChange(); qu^g~"s  
 //}}AFX_MSG $e1.y b%  
 DECLARE_MESSAGE_MAP() 9(t(sP_  
}; ;6@sC[  
#endif HGAi2+&  
LqYyIbsvf  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Tdh(J",d  
#include "stdafx.h" {|>'(iqH"w  
#include "Capture.h" fTXip)n!r  
#include "CaptureDlg.h" P;"moluE;  
#include <windowsx.h> @Ommd{0M  
#pragma comment(lib,"hook.lib") # fqrZ9:@  
#ifdef _DEBUG 8XJi}YPQ  
#define new DEBUG_NEW 1j<uFhi>  
#undef THIS_FILE J2}poNmm  
static char THIS_FILE[] = __FILE__; ^EiU>   
#endif U!uPf:p2  
#define IDM_SHELL WM_USER+1 j-d&4,a:c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \^6[^\@[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2|x !~e.  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; %GTFub0 F  
class CAboutDlg : public CDialog R?u(aY)P  
{ SY|K9$M^  
 public: eL~xS: VT  
  CAboutDlg(); 'IY?=#xr'`  
  // Dialog Data \ Bj{.jL  
  //{{AFX_DATA(CAboutDlg) &]YyV.  
  enum { IDD = IDD_ABOUTBOX }; /4O))}TX  
  //}}AFX_DATA WowT!0$  
  // ClassWizard generated virtual function overrides $y6 <2w%b  
  //{{AFX_VIRTUAL(CAboutDlg) U;/2\Ii  
 protected: QM8Ic,QFvo  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _<RTes  
  //}}AFX_VIRTUAL PR5N:Bw  
  // Implementation |Uics:cQC  
 protected: {C&U q#V  
  //{{AFX_MSG(CAboutDlg) 0g30nr)  
  //}}AFX_MSG f I=G>[  
  DECLARE_MESSAGE_MAP() hZfj$|<  
}; ]y.V#,6e  
(o*YGYC  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) fV4rVy8  
{ z'l HL  
 //{{AFX_DATA_INIT(CAboutDlg) ~;9n6U  
 //}}AFX_DATA_INIT |K_%]1*riC  
} -+{[.U<1jk  
uGz)Vz&3  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4GP?t4][  
{ |dQz(z&6{5  
 CDialog::DoDataExchange(pDX); !-t w  
 //{{AFX_DATA_MAP(CAboutDlg) _{c_z*rM8  
 //}}AFX_DATA_MAP ATqblU>D  
} O|sk "YXF  
O)`L( x  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) :+6W%B  
 //{{AFX_MSG_MAP(CAboutDlg) q83^?0WD  
 // No message handlers  FkrXM!mJ  
 //}}AFX_MSG_MAP h,FU5iK|  
END_MESSAGE_MAP() oc)`hg2=  
1N(#4mE=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 3F]Dh^IR9  
: CDialog(CCaptureDlg::IDD, pParent) #&T O(bk  
{ k Nc- @B  
 //{{AFX_DATA_INIT(CCaptureDlg) p/ xlR[  
  m_bControl = FALSE; mDz44XO   
  m_bAlt = FALSE; 3N$@K"qM#  
  m_bShift = FALSE; "LlQl3"=  
  m_Path = _T("c:\\"); &(,\~  
  m_Number = _T("0 picture captured."); 4/~x+tdc  
  nCount=0; Jy/< {7j  
  bRegistered=FALSE; lv=q( &  
  bTray=FALSE; b5H}0<  
 //}}AFX_DATA_INIT {Z k^J  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <qfAW?tF  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); %W9R08`  
} ~<!j]@.  
e1a\ --  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) O6NH  
{ w^Y/J4 I0  
 CDialog::DoDataExchange(pDX); !O%!A<3  
 //{{AFX_DATA_MAP(CCaptureDlg) %:'G={G`QH  
  DDX_Control(pDX, IDC_KEY, m_Key); AE>W$x8P  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); #M|lBYdW}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); o3hgkoF   
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ;Tr,BfV|Bf  
  DDX_Text(pDX, IDC_PATH, m_Path); 5e. aTW;U  
  DDX_Text(pDX, IDC_NUMBER, m_Number); >BO$tbU5b  
 //}}AFX_DATA_MAP -9FGFBm4]  
} ld ]*J}cw  
:0:Tl/))  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ?'0!>EjY"  
//{{AFX_MSG_MAP(CCaptureDlg) eMnK@J  
 ON_WM_SYSCOMMAND() T`wDdqWbEG  
 ON_WM_PAINT() QNOdt2NN  
 ON_WM_QUERYDRAGICON() vY_[@y  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) vN^.MR+<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) pk9Ics;y  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 1v|-+p42  
//}}AFX_MSG_MAP VA[EY`8  
END_MESSAGE_MAP() Hc'Pp{| X  
@U8u6JNK'  
BOOL CCaptureDlg::OnInitDialog() :.ZWYze  
{ h"+7cc@  
 CDialog::OnInitDialog(); *Z"`g %,;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); dscah0T  
 ASSERT(IDM_ABOUTBOX < 0xF000); H2BRI d  
 CMenu* pSysMenu = GetSystemMenu(FALSE); -y|J_;EG  
 if (pSysMenu != NULL) )XN%pn  
 { -B#1+rUW  
  CString strAboutMenu; U.,S.WP+d  
  strAboutMenu.LoadString(IDS_ABOUTBOX); WF`%7A39Af  
  if (!strAboutMenu.IsEmpty()) E>s+"y  
  { zQulPU  
   pSysMenu->AppendMenu(MF_SEPARATOR); >fWGiFmlk  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,i6E L  
  } uQ-GJI^t  
 } =( |%%,3  
 SetIcon(m_hIcon, TRUE); // Set big icon }qso} WI  
 SetIcon(m_hIcon, FALSE); // Set small icon ]Z5m_-I  
 m_Key.SetCurSel(0); y/\b0&  
 RegisterHotkey(); }qM^J;uy  
 CMenu* pMenu=GetSystemMenu(FALSE); 53{\H&q  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); TiI/I`A  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); l SdA7  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 8^}/T#l  
 return TRUE; // return TRUE unless you set the focus to a control {WV"]O8IV  
} N_bgWQY  
Xd%qebK  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X3G593ts  
{ :W0p3 6"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 12U]=  
 { sMGo1pG(  
  CAboutDlg dlgAbout; N_NN0  
  dlgAbout.DoModal(); ?Vd~  
 } eR \duZ!`  
 else BS fmS(.  
 { : B&~q$  
  CDialog::OnSysCommand(nID, lParam); c ^ds|7i]a  
 } Axsezr/  
} jKmjZz8L]%  
# &.syD#  
void CCaptureDlg::OnPaint() T" {~mQ*  
{ kMCP .D45;  
 if (IsIconic()) <VhmtT%7  
 { THhxj)  
  CPaintDC dc(this); // device context for painting fE~KWLm  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); se %#U40*  
  // Center icon in client rectangle + )Qu,%2   
  int cxIcon = GetSystemMetrics(SM_CXICON); _">F]ptI;  
  int cyIcon = GetSystemMetrics(SM_CYICON); YCiG~y/~  
  CRect rect; T;(,9>Qsu  
  GetClientRect(&rect); 9JP:wE~y  
  int x = (rect.Width() - cxIcon + 1) / 2; > f X^NX  
  int y = (rect.Height() - cyIcon + 1) / 2; K+vD&Z^  
  // Draw the icon (G> su  
  dc.DrawIcon(x, y, m_hIcon); HNS^:X R  
 } P}8hK   
 else %>Gb]dv?  
 { :4V5p =v-  
  CDialog::OnPaint(); 9< ?w9D.1  
 } HSNj  
} ;S U<T^a  
?h4[yp=w  
HCURSOR CCaptureDlg::OnQueryDragIcon() %cn 1d>M+I  
{ 6"G(Iq'2t3  
 return (HCURSOR) m_hIcon; "L]v:lg3  
} ]Ik~TW&  
}&=l)\e  
void CCaptureDlg::OnCancel() OU%"dmSDk  
{ 5 NYS@76o7  
 if(bTray) 5Jo'h]  
  DeleteIcon(); m+'1c}n^7  
  CDialog::OnCancel(); -lJ|x>PG'  
} a?+C]u?_D  
c;]\$#2  
void CCaptureDlg::OnAbout() \;Q(o$5<  
{ Jn{)CZ  
 CAboutDlg dlg; tRU/[?!  
 dlg.DoModal(); !QwB8yK@  
} L?nhm=D  
MXaik+2  
void CCaptureDlg::OnBrowse() >bV3~m$a+  
{ ?<t?G  
 CString str; dYISjk@  
 BROWSEINFO bi;  it H  
 char name[MAX_PATH]; @I4HpY7:  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); F'[Y.tA ,#  
 bi.hwndOwner=GetSafeHwnd(); #9TL5-1y  
 bi.pszDisplayName=name; 1oO(;--u_  
 bi.lpszTitle="Select folder"; ;U4O` pZ  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; uxxk&+M  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); [,Rc&7p~R  
 if(idl==NULL) 1sg:8AA  
  return; _qPKdGoM  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]zj#X\  
 str.ReleaseBuffer(); 7fypUQ:y  
 m_Path=str; IrYj#,xJ  
 if(str.GetAt(str.GetLength()-1)!='\\') &I-:=ir  
  m_Path+="\\"; q0%QMut%  
 UpdateData(FALSE); Pxf>=kY  
} >6Pe~J5,:  
VE]TT><  
void CCaptureDlg::SaveBmp() #L!`n )J"  
{ Ec<33i]h*p  
 CDC dc; UucX1%  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); r8YM#dF  
 CBitmap bm; t"Du  
 int Width=GetSystemMetrics(SM_CXSCREEN); ,$t1LV;o=  
 int Height=GetSystemMetrics(SM_CYSCREEN); g0B-<>E  
 bm.CreateCompatibleBitmap(&dc,Width,Height); tb?TPd-OY  
 CDC tdc; @:w^j0+h  
 tdc.CreateCompatibleDC(&dc); -`5]%.E&8  
 CBitmap*pOld=tdc.SelectObject(&bm); xT&/xZLT  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !j7mY9x+  
 tdc.SelectObject(pOld); AB%i|t  
 BITMAP btm; " l|`LjP5M  
 bm.GetBitmap(&btm); [H\0 '  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; r[ k  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <[ dt2)%L>  
 BITMAPINFOHEADER bih; " TCJT390  
 bih.biBitCount=btm.bmBitsPixel; h(kPf ]0  
 bih.biClrImportant=0; wclj9&k  
 bih.biClrUsed=0; k+[oYd  
 bih.biCompression=0; rx| ,DI  
 bih.biHeight=btm.bmHeight; <=|^\r !}&  
 bih.biPlanes=1; 1:<n(?5JI  
 bih.biSize=sizeof(BITMAPINFOHEADER); p}==aNZK  
 bih.biSizeImage=size; "a;$uW@.6  
 bih.biWidth=btm.bmWidth; 7@ONCG  
 bih.biXPelsPerMeter=0; j9c:SP5  
 bih.biYPelsPerMeter=0; q<.k:v&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); U^[AW$WzU  
 static int filecount=0; i;~.kgtq4  
 CString name; :-59~8&  
 name.Format("pict%04d.bmp",filecount++); W"s/ 8;  
 name=m_Path+name; &^&0,g?To  
 BITMAPFILEHEADER bfh; p&\QkI=  
 bfh.bfReserved1=bfh.bfReserved2=0; l@w\ Vxr  
 bfh.bfType=((WORD)('M'<< 8)|'B'); XC<'m{^(m  
 bfh.bfSize=54+size; \'g7oV;>cI  
 bfh.bfOffBits=54; wG:RvgX}  
 CFile bf; <z60E vHg  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 7>zUT0SS  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [H!do$[>  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @P0rNO %y  
  bf.WriteHuge(lpData,size); 5/6Jq  
  bf.Close(); N4qBCBr(  
  nCount++; jXmY8||w  
 } r-S%gG}~E  
 GlobalFreePtr(lpData); v" #8^q  
 if(nCount==1) Edc3YSg%;  
  m_Number.Format("%d picture captured.",nCount); 7?g({]  
 else }Uj-R3]}K  
  m_Number.Format("%d pictures captured.",nCount); `yl|N L  
  UpdateData(FALSE); A]QGaWK  
} }t(5n$go6  
;K l'[~z  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) bRFZ:hu l  
{ ~~WY?I-  
 if(pMsg -> message == WM_KEYDOWN) g@O?0,+1  
 { ShtV2}s|  
  if(pMsg -> wParam == VK_ESCAPE) d$\n@}8eZp  
   return TRUE; 1M)88&  
  if(pMsg -> wParam == VK_RETURN) )X*_oH=  
   return TRUE; 1)}hzA  
 } u-.5rH l  
 return CDialog::PreTranslateMessage(pMsg); Q>X1 :Zn3  
} pdN8 hJ  
zO9WqP_`iR  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c<q33dZ!*  
{ |R91|-H  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !}mM"|<  
  SaveBmp(); &<&eKq  
  return FALSE; .+8#&Uy  
} ^Q0=Ggh  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `:ZaT('h  
 CMenu pop; mV}8s]29  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;x_T*} CH  
 CMenu*pMenu=pop.GetSubMenu(0); to_dNJbv  
 pMenu->SetDefaultItem(ID_EXITICON); FN26f*/  
 CPoint pt; p;zT #%  
 GetCursorPos(&pt); It'kO jx]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); YJz06E1 -9  
 if(id==ID_EXITICON) !6taOT>v  
  DeleteIcon(); s 64@<oU<"  
 else if(id==ID_EXIT) &`!H1E^  
  OnCancel(); 2GigeN|1N  
 return FALSE; :Eg4^,QX  
} [70 _uq  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5 <KBMCn  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) b H5lLcdf  
 AddIcon(); B|^=2 >8s  
 return res; P"Q6wdm  
} Wl&6T1A`"  
+sZY0(|K8  
void CCaptureDlg::AddIcon() FD~uUZTM  
{ #Wl9[W/4  
 NOTIFYICONDATA data; ~r})&`5  
 data.cbSize=sizeof(NOTIFYICONDATA); y9i+EV  
 CString tip; X+\=dhn69  
 tip.LoadString(IDS_ICONTIP); #Ph8 ?  
 data.hIcon=GetIcon(0); j~in%|^  
 data.hWnd=GetSafeHwnd(); [ p0_I7  
 strcpy(data.szTip,tip); 6m(+X M S  
 data.uCallbackMessage=IDM_SHELL; |1!OwQax  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; iH)vLD  
 data.uID=98; Lrt~Q:z2u  
 Shell_NotifyIcon(NIM_ADD,&data); j}}as  
 ShowWindow(SW_HIDE); (L1O;~$  
 bTray=TRUE; %t.\J:WN;  
} e9k$5ps  
S}/ZHo  
void CCaptureDlg::DeleteIcon() Y)S f;  
{ QUXr#!rPY|  
 NOTIFYICONDATA data; XGnC8Be{4  
 data.cbSize=sizeof(NOTIFYICONDATA); R6GlQ G  
 data.hWnd=GetSafeHwnd(); bV)h\:oC  
 data.uID=98; F&+_z&n)  
 Shell_NotifyIcon(NIM_DELETE,&data); 0x,4H30t(  
 ShowWindow(SW_SHOW); }lx'NY~(W  
 SetForegroundWindow(); }vF=XA  
 ShowWindow(SW_SHOWNORMAL); p7Yb8#XfU  
 bTray=FALSE; +q432ZG  
} 7S_"h*Ud  
5Yk|  
void CCaptureDlg::OnChange()  GXTjK!  
{ q+4<"b+6G  
 RegisterHotkey(); 7bM H  
} i94)DWZ^  
6l|SGt\  
BOOL CCaptureDlg::RegisterHotkey() <HW2W"Go\  
{ 8f&#WIZ  
 UpdateData(); uF*tlaV6  
 UCHAR mask=0; :G<~x8]k0  
 UCHAR key=0; gHvkr?Cg  
 if(m_bControl) wD pL9q  
  mask|=4; lz#@_F|.*  
 if(m_bAlt) Hg(nC*#/Q  
  mask|=2; Io7 =Mc4  
 if(m_bShift) `Go oSX  
  mask|=1; h&Q-QU  
  key=Key_Table[m_Key.GetCurSel()]; srU*1jD)  
 if(bRegistered){ :?3y)*J!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); $4CsiZ6  
  bRegistered=FALSE; gln X C  
 } V\%s)kq  
 cMask=mask; 2 :^  
 cKey=key; Xr|e%]!**  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); u&Xn#f h  
 return bRegistered; 7I@@}A  
} g.Kyfs4`  
!xC IvKW  
  四、小结 c=:A/z{  
PtKrks|y  
  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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