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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: y|[YEY U)  
  YztW1GvI  
  一、实现方法 c;1Xu1  
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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: X1; ljX  
ZsepTtY  
#pragma data_seg("shareddata") !L\P.FP7b  
HHOOK hHook =NULL; //钩子句柄 XoqmT/P  
UINT nHookCount =0; //挂接的程序数目 ;c~%:|  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fN{JLp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 l/o 4bkV  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  R7-+@  
static int KeyCount =0; ejI nJ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 O^yD b  
#pragma data_seg() @$%[D`Wa<  
Zi~-m]9U  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 o"./  
/6a617?9J  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: p:q?8+W-r  
3 tIno!|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR b~<Tgo_/jf  
cKey,UCHAR cMask) [^GXHE=  
{ TBp$S=_**  
 BOOL bAdded=FALSE; rytaC(  
 for(int index=0;index<MAX_KEY;index++){ WnZn$N.  
  if(hCallWnd[index]==0){ :OvTZ ?\  
   hCallWnd[index]=hWnd; ;L.RfP"5<  
   HotKey[index]=cKey; !w-`:d?  
   HotKeyMask[index]=cMask; r>gU*bs(  
   bAdded=TRUE; (jB_uMuS  
   KeyCount++; -Rz%<`  
   break; ,.T k "\@  
  } [n{c,U F  
 } A*_ |/o  
 return bAdded; )+xHv  
} /QK H30E  
//删除热键 \"W _\&X  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u*i[A\Y  
{ [_SV$Jz  
 BOOL bRemoved=FALSE; wSP'pM{#2  
 for(int index=0;index<MAX_KEY;index++){ 0?d}Oj  
  if(hCallWnd[index]==hWnd){ _ BUD~'Q5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ qD/X%`>Q  
    hCallWnd[index]=NULL; i!9|R)c  
    HotKey[index]=0; It8m]FN  
    HotKeyMask[index]=0; Af%#&r7W  
    bRemoved=TRUE; 4x%R4tk  
    KeyCount--; |37y ="  
    break; n.\|NR'v  
   } MY `V0  
  } D%NVqk|  
 } BavGirCp  
 return bRemoved; {s/u [T_D2  
} Gv uX"J  
w~I;4p~(N  
k%S;N{Qh@  
  DLL中的钩子函数如下: b`Agb <x"  
>4N=P0=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) o$FYCz n  
{ E5U{.45  
 BOOL bProcessed=FALSE; yC<[LH  
 if(HC_ACTION==nCode)  %SSBXWP  
 { 8rwXbYx x  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 C-6m[W8S  
   switch(wParam) 4RXF.kJ3=  
   {  'E#;`}&Ah  
    case VK_MENU: wX!>&Gc.  
     MaskBits&=~ALTBIT; O=LiCSNEV  
     break; >u)DuZXj  
    case VK_CONTROL: ehCZhi~  
     MaskBits&=~CTRLBIT; uk)6%  
     break; =u^{Jvl[  
    case VK_SHIFT: Skn2-8;10  
     MaskBits&=~SHIFTBIT; 7 ,![oY[  
     break; ahJu+y  
    default: //judge the key and send message wmf#3"n  
     break; ?()$imb*  
   } M~/R1\'&j  
   for(int index=0;index<MAX_KEY;index++){ Jm(sx'qPx  
    if(hCallWnd[index]==NULL) .]\+JTm  
     continue; hXE_OXZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C)|{7W  
    { $6 A91|ZSQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); a6vls]?  
     bProcessed=TRUE; |f.R]+cH  
    } }*ZOD1j  
   } !e"TWO*X  
  } QTNE.n<?  
  else if((lParam&0xc000ffff)==1){ //有键按下 aC#8%Spj  
   switch(wParam) \X?GzQkr  
   { ^.f`6 6/  
    case VK_MENU: ^%:syg_RM[  
     MaskBits|=ALTBIT; O] nZr  
     break; 6+;B2;*3  
    case VK_CONTROL: m {)F9F  
     MaskBits|=CTRLBIT; \HsrUZ~  
     break; d].(x)|st  
    case VK_SHIFT: Gap\~Z@L  
     MaskBits|=SHIFTBIT; #g6*s+Gm  
     break; VP<_~OLc  
    default: //judge the key and send message }N6r/ VtOQ  
     break; /EpsJb`kj  
   } 4}\Dr %US  
   for(int index=0;index<MAX_KEY;index++){ (.DX</f/4  
    if(hCallWnd[index]==NULL) H!+T2<F9R  
     continue; w[V71Iej  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tbP ;iK'  
    { [qEd`8V (  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~!Q\\_  
     bProcessed=TRUE; lN-[2vT<  
    } !]-ET7  
   } Vu`O%[Q/  
  } BVt)~HZ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 uWSfr(loX  
   for(int index=0;index<MAX_KEY;index++){ QE8aYPSFf  
    if(hCallWnd[index]==NULL) eT|"6WJ:{  
     continue; 9se ,c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 34$qV{Y%y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Lb>UraUvL  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 $M(ZKS3,j  
   } Gpauy=4f  
  } 5ma*&Q8+  
 } vV?=r5j  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #q5 L4uM9  
} @zHTKi`  
?+WSYg0  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: BP7&w d  
y,`SLgBID  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); re `B fN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aNW!Y':*  
P}El#y#&  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: eI 6G  
qrj:H4#VB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ak\w)!?s  
{ fs=W(~"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) :]viLw\&g  
 { {'QA0K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #z*-  
  SaveBmp(); Z\`i~  
  return FALSE; ;U^7 ]JO;  
 } \Q5Jg  
 …… //其它处理及默认处理 =nmvG%.hd  
} ezC2E/#  
!P6\-.  
v/Z!Wp1LV  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 .\?)O+J!  
f~LM-7!zf}  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 1P'R-I  
8u401ddg  
  二、编程步骤 l9%oKJ;  
3r)<:4a u&  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ^_cR  
c%|18dV  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;LBq!  
tyH*epa nw  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; {=Y.Z1E:  
Ny.s u?E  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; m 8Q[+_:$H  
YXR%{GUP[  
  5、 添加代码,编译运行程序。 #^>5,M2  
Vko1{$}t  
三、程序代码 tWNz:V  
!]W}I  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wuv2bd )+  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ZS-O,[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5F8sigr/h  
#if _MSC_VER > 1000 bOi`JJ^   
#pragma once "0lC:Wu]  
#endif // _MSC_VER > 1000 1w)#BYc=L  
#ifndef __AFXWIN_H__ gZFtV  
#error include 'stdafx.h' before including this file for PCH H^N@fG<*dh  
#endif Z.Sq5\d  
#include "resource.h" // main symbols kO]],Vy`  
class CHookApp : public CWinApp H'L ~8>  
{ )<D(Mb 2p|  
 public: r&G=}ZMO  
  CHookApp(); +=5Dt7/|  
  // Overrides k0=$mmmPY  
  // ClassWizard generated virtual function overrides \&&jzU2  
  //{{AFX_VIRTUAL(CHookApp) M-Az2x;6  
 public: <fJ*{$[p  
  virtual BOOL InitInstance(); $_6DvJ0  
  virtual int ExitInstance(); H)s$0Xd  
  //}}AFX_VIRTUAL L y!!+UM\  
  //{{AFX_MSG(CHookApp) 8H>: C (h  
  // NOTE - the ClassWizard will add and remove member functions here. e7j3 0Iy  
  // DO NOT EDIT what you see in these blocks of generated code ! PTu~PVbp4  
  //}}AFX_MSG ;+dB-g[  
  DECLARE_MESSAGE_MAP() >taC_f06  
}; #gw ys  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); hJ+;N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RtrESwtR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >k6RmN  
BOOL InitHotkey(); 7PDz ]i  
BOOL UnInit(); OZ*V7o  
#endif B u ~N)^  
F+Qp mVU  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. H+]>*^'8  
#include "stdafx.h" xwwy9:ze*l  
#include "hook.h" J~0_  
#include <windowsx.h> F8\nAX  
#ifdef _DEBUG /$7_*4e  
#define new DEBUG_NEW <bPn<QI  
#undef THIS_FILE @ (UacFO  
static char THIS_FILE[] = __FILE__; 7*e7P[LQU  
#endif 7 I/  
#define MAX_KEY 100 / M(A kNy  
#define CTRLBIT 0x04 !H`! KBW  
#define ALTBIT 0x02 L6^Qn%:OTd  
#define SHIFTBIT 0x01 edt(Zzk@3-  
#pragma data_seg("shareddata") ,cR=W|6cQm  
HHOOK hHook =NULL; A6APU><dm^  
UINT nHookCount =0; tN' -4<+  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey p/|": (U  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Z|YiYQl[)  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey cO,ELu  
static int KeyCount =0; j5*W[M9W  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift y/>]6Pj  
#pragma data_seg() SArSi6vF  
HINSTANCE hins; [@U2a$k+d  
void VerifyWindow(); vHY."$|H  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 6.z8!4fpl  
//{{AFX_MSG_MAP(CHookApp) ]j.??'+rg  
// NOTE - the ClassWizard will add and remove mapping macros here. \0'7p-T6  
// DO NOT EDIT what you see in these blocks of generated code! zV(F9}^  
//}}AFX_MSG_MAP "y_A xOH  
END_MESSAGE_MAP() QRs!B!Fn0  
b(lC7Xm  
CHookApp::CHookApp() |OXufV?I  
{ $z-zscco  
 // TODO: add construction code here, *5DOTWos  
 // Place all significant initialization in InitInstance f)xHSF"  
} gDP\u<2!  
^^[MDjNy@  
CHookApp theApp; O]OZt,k(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }MKm>N  
{ k<xiP@b{y  
 BOOL bProcessed=FALSE; 4{Vw30DZ  
 if(HC_ACTION==nCode) ,t4g^67R{  
 { Sri,sZv  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7/.-dfEK  
   switch(wParam) <<@vy{*Hg  
   { eMPk k=V  
    case VK_MENU: 9kcp(  
     MaskBits&=~ALTBIT; b?#k  
     break; S ^?&a5{o  
    case VK_CONTROL: eGrC0[SH  
     MaskBits&=~CTRLBIT; >gAq/'.Q  
     break; l4oI5)w  
    case VK_SHIFT: @\,WJmW  
     MaskBits&=~SHIFTBIT; WN?1J4H  
     break; :eQ?gM!,  
    default: //judge the key and send message S/j~1q_|G  
     break; 8U8l 5r  
   } |];s[^$#  
   for(int index=0;index<MAX_KEY;index++){ -1ke3  
    if(hCallWnd[index]==NULL) y6|&bJ @  
     continue; T<*i($ [  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  =(kwMJ  
    { (>*<<a22  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); JO:40V?op  
     bProcessed=TRUE; zmf`}j[  
    } 5}3Q}o#  
   } 38IVSK_  
  } ;H5H7ezV  
  else if((lParam&0xc000ffff)==1){ //Key down 3%Jg' Tr+  
   switch(wParam) d[+xLa  
   { sy+o{] N  
    case VK_MENU: r40#-A$  
     MaskBits|=ALTBIT; jHPJk8@y  
     break; #/'5N|?  
    case VK_CONTROL: )Yvf9dl  
     MaskBits|=CTRLBIT; ar.w'z  
     break; 7dl]f#uZU  
    case VK_SHIFT: JV|GE n\@N  
     MaskBits|=SHIFTBIT; ^E&':6(  
     break; FHVZ/ e  
    default: //judge the key and send message @,i_ KN6C  
     break; yBKkx@o#z  
   } M IPmsEdBi  
   for(int index=0;index<MAX_KEY;index++) Fy N@mX  
   { pqPhtWi%PJ  
    if(hCallWnd[index]==NULL) xX l^\?HC  
     continue; k36%n *4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >&h#t7<  
    { K29]B~0%E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); BJDe1W3;'  
     bProcessed=TRUE; ^|DI9G(Bs  
    } ($^XF:#5  
   } 2F(zHa  
  } 7Wg0-{yK4  
  if(!bProcessed){ kd9rvy0oK  
   for(int index=0;index<MAX_KEY;index++){ B@Zed Xi  
    if(hCallWnd[index]==NULL) *9}2Bmojv  
     continue; o.DT`L8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JFVal#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T69'ta32V  
   } HVzG }r(J  
  } @)mH"u!(7  
 } K1O0/2O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); kQXtO)  
} gio'_X  
3IHya=qN  
BOOL InitHotkey() Wd'wL"6De  
{ hA)tad]  
 if(hHook!=NULL){ w~>V2u_-  
  nHookCount++; z5Hz-.  
  return TRUE; Two$wL/  
 } N<ww&GXBX  
 else \k;)m-0bj{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ou6|;*>d  
  if(hHook!=NULL) IbAGnl{  
   nHookCount++; $-9m8}U(Y  
  return (hHook!=NULL); 6R% I)  
} v/6QE;BY&Q  
BOOL UnInit() S/pTFlptCa  
{ n'ft@7>%h  
 if(nHookCount>1){ X"<t3l(+  
  nHookCount--; d V#h~  
  return TRUE; g]O"l?xx1D  
 } ZK4/o  
 BOOL unhooked = UnhookWindowsHookEx(hHook); jvn:W{'Q  
 if(unhooked==TRUE){ . Rxz;-VA  
  nHookCount=0; FCU~*c8Cs  
  hHook=NULL; O [GG<Um  
 } <\@JbL*  
 return unhooked; Kxb_9y0`r  
} Ro`Hm8o/  
nb0V~W  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qCOe,$\1/  
{ +avu&2B  
 BOOL bAdded=FALSE; rwr>43S5<3  
 for(int index=0;index<MAX_KEY;index++){ _O ~DJ"  
  if(hCallWnd[index]==0){ 'VCF{0{H~  
   hCallWnd[index]=hWnd; s)W^P4<  
   HotKey[index]=cKey; 8E1swH5 z  
   HotKeyMask[index]=cMask; 3=V79&  
   bAdded=TRUE; NK'awv),pM  
   KeyCount++; RajzH2j+>  
   break; +K2jYgy  
  } =p|,~q&i  
 } ?cf9q@eAH  
 return bAdded; gS ~QlW V  
} [#V?]P\uV  
[9NzvC 9I  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C0;c'4(  
{ SN O'*?  
 BOOL bRemoved=FALSE; *KSQ^.sYh  
 for(int index=0;index<MAX_KEY;index++){ ^'r/;(ZF*/  
  if(hCallWnd[index]==hWnd){ MDa 4U@Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ CGvU{n,"  
    hCallWnd[index]=NULL; h{I)^8,M  
    HotKey[index]=0; DU#6%8~  
    HotKeyMask[index]=0; S !cc%  
    bRemoved=TRUE; U bT7  
    KeyCount--; KOVGwEj  
    break; k2muHKBlk  
   } n%? bMDS  
  } HkFoyy  
 } gy/z;fB  
 return bRemoved; yU3fM?a  
} uqPagt<  
S1NM9xHJ  
void VerifyWindow() vFXih'=_  
{ @D&VOJV  
 for(int i=0;i<MAX_KEY;i++){ 9/TF #  
  if(hCallWnd!=NULL){ ;muxIr`?  
   if(!IsWindow(hCallWnd)){ m[,! orq  
    hCallWnd=NULL; xpt*S~  
    HotKey=0; 8W Mhe=[  
    HotKeyMask=0; V~` ?J6  
    KeyCount--; XfmPq'#Z  
   } 57^ X@ra$  
  } LC)-aw>-  
 } q-O=Em<*  
} >p Y0f }  
9 m MPkgc  
BOOL CHookApp::InitInstance() ^2}0lP|  
{ H->J.5~,K  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); V9qA.NV2  
 hins=AfxGetInstanceHandle(); `Xvrf  
 InitHotkey(); [f,; +Ze  
 return CWinApp::InitInstance(); ZW n j-  
} 8.bIP ju%v  
W>+\A"  
int CHookApp::ExitInstance() >.N?y@  
{ XhjH68S(  
 VerifyWindow(); cLn&b}8'  
 UnInit(); IY2ca Xu  
 return CWinApp::ExitInstance();  +T02AS  
} ^=@L(;Y  
M \rW  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Kf#9-.}?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) S*<+vIo  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7<['4*u  
#if _MSC_VER > 1000 1*<m,.$  
#pragma once jh \L)a*  
#endif // _MSC_VER > 1000 W3K?K-  
$-'p6^5  
class CCaptureDlg : public CDialog e>\[OwF-x  
{ uuW._$.A>  
 // Construction Xl^=&!S>me  
 public: raRb K8CQ  
  BOOL bTray; WrBiAh,  
  BOOL bRegistered; "HSAwe`5jU  
  BOOL RegisterHotkey(); A46z2  
  UCHAR cKey; [`^5Zb  
  UCHAR cMask; '=}F}[d"kk  
  void DeleteIcon(); J P'|v"  
  void AddIcon(); &y"e|aE  
  UINT nCount; !2>MaV1,  
  void SaveBmp(); ^3?]S{1/#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 1 i # .h$  
  // Dialog Data <hazrKUn  
  //{{AFX_DATA(CCaptureDlg) + >?"P^  
  enum { IDD = IDD_CAPTURE_DIALOG }; gwwYz]'d>r  
  CComboBox m_Key; mb_*FJB-_  
  BOOL m_bControl; /f2HZfj  
  BOOL m_bAlt; }_m/3*x_  
  BOOL m_bShift; ]G m"U!h*  
  CString m_Path; LRl2@&z<  
  CString m_Number; ikd~k>F  
  //}}AFX_DATA Oo<L~7B  
  // ClassWizard generated virtual function overrides 7kJ =C  
  //{{AFX_VIRTUAL(CCaptureDlg) J+ tpBPmb  
 public: w3oh8NRs_  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Ux5pw  
 protected: f&x7g.I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >.^/Z/[.L  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _s{on/u  
  //}}AFX_VIRTUAL AB92R/  
  // Implementation }: v&Nc  
 protected: F"o K*s  
  HICON m_hIcon; I\eM8`Y$  
  // Generated message map functions 2 )oT\m  
  //{{AFX_MSG(CCaptureDlg) _qwKFC  
  virtual BOOL OnInitDialog(); X}Heaqn  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); hJ[Z~PC\T0  
  afx_msg void OnPaint(); !Wn^B|  
  afx_msg HCURSOR OnQueryDragIcon(); G}ZJ}5h  
  virtual void OnCancel(); ;Gf,$dbWn  
  afx_msg void OnAbout(); 3Q'Q %2  
  afx_msg void OnBrowse(); Te&F2`vo  
  afx_msg void OnChange(); fHK`u'  
 //}}AFX_MSG .;#Wf @V  
 DECLARE_MESSAGE_MAP() @T>\pP]o  
}; (/6~*<ZGT  
#endif _Ec9g^I10  
Kxs_R#k  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Y#[jDS(ip  
#include "stdafx.h" Qf0]7  
#include "Capture.h" 701ei;   
#include "CaptureDlg.h" -js:R+C528  
#include <windowsx.h> Ei@w*.3P<  
#pragma comment(lib,"hook.lib") n1D,0+N=  
#ifdef _DEBUG ?Ybgzb  
#define new DEBUG_NEW x,)|;HXm  
#undef THIS_FILE )nncCU W  
static char THIS_FILE[] = __FILE__; Rs*]I\  
#endif l0hcNEj{W  
#define IDM_SHELL WM_USER+1 w"?H4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yb{ud  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1nHQ)od  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; UqJ}5{rt  
class CAboutDlg : public CDialog wB%:RI,  
{ ,T:Uk*Bj  
 public: Q7u/k$qN  
  CAboutDlg(); i|5.DhK}  
  // Dialog Data {p -q&k&R|  
  //{{AFX_DATA(CAboutDlg) |ipL.<v7  
  enum { IDD = IDD_ABOUTBOX }; Pv@P(y?\  
  //}}AFX_DATA 3QNu7oo  
  // ClassWizard generated virtual function overrides |"t)#BUtL  
  //{{AFX_VIRTUAL(CAboutDlg) 1>5l(zK!9  
 protected: 1< 22,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support IY$v%%2WZ  
  //}}AFX_VIRTUAL C%#%_ "N  
  // Implementation zvJQ@i"Z  
 protected: Yi?X|"\`  
  //{{AFX_MSG(CAboutDlg) 6k569c{7  
  //}}AFX_MSG v D"4aw  
  DECLARE_MESSAGE_MAP() RRXnj#<g  
}; \9r1JP0  
~=xiMB;oH  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) W@"s~I6  
{ Fog4m=b`g  
 //{{AFX_DATA_INIT(CAboutDlg) 5%`fh%  
 //}}AFX_DATA_INIT zn!H&!8&  
} 5W%^g_I  
Y z"B  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) [WZGu6$SU  
{ !'yCB9]O  
 CDialog::DoDataExchange(pDX); VTM*=5|c   
 //{{AFX_DATA_MAP(CAboutDlg) OAlV7cfD  
 //}}AFX_DATA_MAP t(d$v_*y51  
} g7Xjo )  
DcjF $E  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) AcRrk  
 //{{AFX_MSG_MAP(CAboutDlg) G3Z>,"w;=  
 // No message handlers BC*)@=7fx  
 //}}AFX_MSG_MAP 4gyC?#Ede  
END_MESSAGE_MAP() c:[z({`  
I[P43>F3  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Ii*tux!S  
: CDialog(CCaptureDlg::IDD, pParent) 1W@ C]n4  
{ k 5~#_D>  
 //{{AFX_DATA_INIT(CCaptureDlg) h`{agW B  
  m_bControl = FALSE; [9}D+k F  
  m_bAlt = FALSE; >d/DXv 3  
  m_bShift = FALSE; aHhr_.>X  
  m_Path = _T("c:\\"); yf 7Sz$Eq  
  m_Number = _T("0 picture captured."); ">-J+ST%  
  nCount=0; */8b)I}yY  
  bRegistered=FALSE; OD;-0Bj  
  bTray=FALSE; PIo8mf/  
 //}}AFX_DATA_INIT p= fj1*  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 i\h"N K  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); U"SH fI:  
} ,}8|[)"  
)\xDo<@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) >0^oC[ B  
{ \:7G1_o  
 CDialog::DoDataExchange(pDX); n:TWZ.9  
 //{{AFX_DATA_MAP(CCaptureDlg) r2t|,%%N7  
  DDX_Control(pDX, IDC_KEY, m_Key); x-hr64WFK  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  /y2)<{{I  
  DDX_Check(pDX, IDC_ALT, m_bAlt); p'@| O q&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Y! 8 I  
  DDX_Text(pDX, IDC_PATH, m_Path); 3izGMH_`  
  DDX_Text(pDX, IDC_NUMBER, m_Number); sN"JVJXi  
 //}}AFX_DATA_MAP Ah_,5Z@&R  
} 9i^dQV.U=  
v|]1x2191  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 7dg2-4  
//{{AFX_MSG_MAP(CCaptureDlg) G@.TE7a2Z  
 ON_WM_SYSCOMMAND() bi:TX<K+  
 ON_WM_PAINT() Ne!0`^`~  
 ON_WM_QUERYDRAGICON() 6}q8%[l|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6ct'O**k*&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 'MWu2L!F  
 ON_BN_CLICKED(ID_CHANGE, OnChange) XWuHH;~*L  
//}}AFX_MSG_MAP 3zr95$Mt  
END_MESSAGE_MAP() t9C.|6X  
XA1gV>SJ  
BOOL CCaptureDlg::OnInitDialog() ~4T:v _Q7g  
{ ulA||  
 CDialog::OnInitDialog(); 3?n2/p 7=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); AlVB hR`  
 ASSERT(IDM_ABOUTBOX < 0xF000); @N(*1,s2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); NQ9/,M  
 if (pSysMenu != NULL) cN?}s0  
 { 2:8p>^g=  
  CString strAboutMenu; CyHaFUbZ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); _NwB7@ e  
  if (!strAboutMenu.IsEmpty()) D#8uj=/%  
  { ^yl)c \`  
   pSysMenu->AppendMenu(MF_SEPARATOR); z\kiYQ6kA  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); eH0^d5bH  
  } N(7UlS,u'  
 } BQOit.  
 SetIcon(m_hIcon, TRUE); // Set big icon P{2ue`w[  
 SetIcon(m_hIcon, FALSE); // Set small icon 1:.I0x!  
 m_Key.SetCurSel(0); ~uUN\qx52  
 RegisterHotkey(); QTC-W2t]  
 CMenu* pMenu=GetSystemMenu(FALSE); XCP/e p  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >QA;02  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^!FLi7X  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .XZq6iF9  
 return TRUE; // return TRUE unless you set the focus to a control l`mNOQ@}'  
} 8Ry%HV9VE  
EE,57(  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $~h\`vF&  
{ Vw@?t(l>  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) gfPR3%EXs  
 { 'xG:v)(  
  CAboutDlg dlgAbout; CAJ]@P#Xj+  
  dlgAbout.DoModal(); Y3n6y+Uzk  
 } )%(V.?eW  
 else ?l/$cO  
 { X+$IaLfCxD  
  CDialog::OnSysCommand(nID, lParam); ~BbF:DS  
 } y~r5KB6w  
} d#W>"Cqxqa  
wG-lR,glb  
void CCaptureDlg::OnPaint() `B%IHr  
{ q+J;^u"E  
 if (IsIconic()) zm{U.Q  
 { .@kjC4m  
  CPaintDC dc(this); // device context for painting 0rA&Q0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); zHg1K,t:  
  // Center icon in client rectangle />13?o#  
  int cxIcon = GetSystemMetrics(SM_CXICON); 2 {I(A2  
  int cyIcon = GetSystemMetrics(SM_CYICON); yh'P17N|q  
  CRect rect; `0z8J*T]  
  GetClientRect(&rect); d7U%Q8?wUR  
  int x = (rect.Width() - cxIcon + 1) / 2; eKv{N\E  
  int y = (rect.Height() - cyIcon + 1) / 2; #Ave r]eK  
  // Draw the icon H[e=^JuD  
  dc.DrawIcon(x, y, m_hIcon); `^G?+p2E  
 } >OotgJnhC  
 else Z'cL"n\9R]  
 { K1oSoD8c  
  CDialog::OnPaint(); Qw@_.I  
 } |ZmWhkOX  
} (j%;)PTe+&  
B*AF8wX|  
HCURSOR CCaptureDlg::OnQueryDragIcon() [+2iwfD  
{ M/LC:,  
 return (HCURSOR) m_hIcon; Zk*!,,P!  
} 1(`UzC=R|  
Pe`eF(J  
void CCaptureDlg::OnCancel() M\!z='Fi  
{ Xf/qUao  
 if(bTray) _Z0O]>KH  
  DeleteIcon(); #[ TOe  
  CDialog::OnCancel(); ]7/6u.G7R  
} mNDd>4%H_  
CYH o~VIK  
void CCaptureDlg::OnAbout() g54b}vzm  
{ y yqya[-11  
 CAboutDlg dlg; 6^#@y|.  
 dlg.DoModal(); 6xT" j)h  
} 3qVDHDQ?ZV  
{~0r3N4Zl  
void CCaptureDlg::OnBrowse() ":Uv u[-  
{ L >HyBB  
 CString str; k%TjRf{p  
 BROWSEINFO bi; ^- H  
 char name[MAX_PATH]; hTS?+l  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); [39  
 bi.hwndOwner=GetSafeHwnd(); .% {4B,d$  
 bi.pszDisplayName=name; %1UdG6&J_  
 bi.lpszTitle="Select folder"; )oCb9K:km  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  '.5_L8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 7dq*e4z)  
 if(idl==NULL) # M18&ld,r  
  return; h3BDHz,  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); qP4vH]  
 str.ReleaseBuffer(); 6_a~ 4_#  
 m_Path=str; EpdSsfDP  
 if(str.GetAt(str.GetLength()-1)!='\\') o4Hp|iK&0  
  m_Path+="\\"; Uf`~0=w  
 UpdateData(FALSE); 4cQ|"sOzD  
} rI;84=v2&9  
%7 [ Z/U=  
void CCaptureDlg::SaveBmp() h$U(1B  
{ ;%V)lP"o  
 CDC dc; E%np-is{1  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); sF!nSr  
 CBitmap bm; 7]pi.1i  
 int Width=GetSystemMetrics(SM_CXSCREEN); mWiX@#,  
 int Height=GetSystemMetrics(SM_CYSCREEN); cms9]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); +-d)/h.7  
 CDC tdc; n~C!PXE  
 tdc.CreateCompatibleDC(&dc); "qxu9Hg!  
 CBitmap*pOld=tdc.SelectObject(&bm); ;RW0 24  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); N~0~1 WQn  
 tdc.SelectObject(pOld); N[j*Q 8X_  
 BITMAP btm; a%NSL6  
 bm.GetBitmap(&btm); pe@j`Sm:Ej  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; gzd)7np B2  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); W"&Y7("y  
 BITMAPINFOHEADER bih; ITr@;@}c]  
 bih.biBitCount=btm.bmBitsPixel; kr{eC/Q"  
 bih.biClrImportant=0; m0[JiwPI  
 bih.biClrUsed=0; IWs)n1D*]  
 bih.biCompression=0; ;Q8LA",5d  
 bih.biHeight=btm.bmHeight; Ce-D^9kC  
 bih.biPlanes=1; E@N& Y1t  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]J)3y+;P  
 bih.biSizeImage=size; P8\bi"iiN  
 bih.biWidth=btm.bmWidth; @/ G$ C9<  
 bih.biXPelsPerMeter=0; )4CF*>*6V  
 bih.biYPelsPerMeter=0; TD6MP9L  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); si,W.9rU  
 static int filecount=0; SO8b~N  
 CString name; /^^wHW:  
 name.Format("pict%04d.bmp",filecount++); R8n/QCeY{  
 name=m_Path+name; 0fP-[7P  
 BITMAPFILEHEADER bfh; 60Szn]z'8[  
 bfh.bfReserved1=bfh.bfReserved2=0; j _p|>f<}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2PVtyV3;  
 bfh.bfSize=54+size; &vHfuM`  
 bfh.bfOffBits=54; $CP_oEb  
 CFile bf; , HHCgN  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ CTh!|mG  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); EN/e`S$)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); J0V\_ja-  
  bf.WriteHuge(lpData,size); hJkF-yW  
  bf.Close(); YIZ+BVa  
  nCount++; h&O8e;S#  
 } 2/4,iu(T`c  
 GlobalFreePtr(lpData); { 2\.  
 if(nCount==1) `;BpdG(m  
  m_Number.Format("%d picture captured.",nCount); MQ7Hn;`B  
 else  OK\F  
  m_Number.Format("%d pictures captured.",nCount); Nub)]S>_/t  
  UpdateData(FALSE); bUS"1Tg]*6  
} wN^$8m5\T^  
V+- ]txu|  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ON q=bI*  
{ *Iir/6myM  
 if(pMsg -> message == WM_KEYDOWN) ._A@,]LS}  
 { dSq3V#Q  
  if(pMsg -> wParam == VK_ESCAPE) .Mz'h 9@  
   return TRUE; X|wg7>kh*`  
  if(pMsg -> wParam == VK_RETURN) JVawWw0q  
   return TRUE; :0'2m@x~  
 } )"4v0dv  
 return CDialog::PreTranslateMessage(pMsg); *p=a-s5-  
} 2Pz)vnV"  
NU{`eM  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N"Mw1R4  
{ T]0H&Oov  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ qG?svt  
  SaveBmp(); W1;u%>Uh  
  return FALSE; 8DO3L "  
} ;[R#:Rk  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [Z$E^QAP  
 CMenu pop; \\{+t<?J  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); RZrQ^tI3"  
 CMenu*pMenu=pop.GetSubMenu(0); Y24H` s1u/  
 pMenu->SetDefaultItem(ID_EXITICON); OS7^S1r-  
 CPoint pt; E whCX'Vaj  
 GetCursorPos(&pt); +%: /!T@@  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 6-!U\R2Z>  
 if(id==ID_EXITICON) Z(0sMOaX  
  DeleteIcon(); GiGXV @dq  
 else if(id==ID_EXIT) w(-h!d51+  
  OnCancel(); 7v{s?h->$  
 return FALSE; \;F_QV  
} *Z:'jV<  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); o b,%); m  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) D/x!`&.sN  
 AddIcon(); O\&[|sGY{  
 return res; _oBJ'8R\  
} \Uh$%#}.  
#cdrobJ  
void CCaptureDlg::AddIcon() ~;uc@GGo  
{ m2h@*  
 NOTIFYICONDATA data; *%;+3SV  
 data.cbSize=sizeof(NOTIFYICONDATA); A1uo@W  
 CString tip; `Eq~W@';Q0  
 tip.LoadString(IDS_ICONTIP); MeMSF8zSQ  
 data.hIcon=GetIcon(0); NPY\ >pf  
 data.hWnd=GetSafeHwnd(); f&ri=VJY\T  
 strcpy(data.szTip,tip); ;eQOBGX9  
 data.uCallbackMessage=IDM_SHELL; (m%A>e B  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; k3 S  
 data.uID=98; ,UE>@;]  
 Shell_NotifyIcon(NIM_ADD,&data); m&!4*D  
 ShowWindow(SW_HIDE); h qT6]*  
 bTray=TRUE; RP|/rd]-k  
} \#O}K  
&K@ RTgb  
void CCaptureDlg::DeleteIcon() mNDz|Ln  
{ Ap)[;_9BD  
 NOTIFYICONDATA data; + 2?=W1`  
 data.cbSize=sizeof(NOTIFYICONDATA); waRK$/b (  
 data.hWnd=GetSafeHwnd(); H68~5lJY^]  
 data.uID=98; (eEs0  
 Shell_NotifyIcon(NIM_DELETE,&data); T\3a T  
 ShowWindow(SW_SHOW); Tc.k0n%W:b  
 SetForegroundWindow(); BK;Gh0mp  
 ShowWindow(SW_SHOWNORMAL); {.mP e|  
 bTray=FALSE; i0/RvrLc  
} Pua| Z x  
f:hsE  
void CCaptureDlg::OnChange() wR]jJb F  
{ ?CU6RC n  
 RegisterHotkey(); Ww)p&don  
} yDe6f(D  
pB0p?D)n  
BOOL CCaptureDlg::RegisterHotkey() O~~WP*N  
{ RF$2p4=[  
 UpdateData(); |X6/Y@N  
 UCHAR mask=0; vv0+F6 @  
 UCHAR key=0; %!X9>i>  
 if(m_bControl) [3|&!:4g6  
  mask|=4; rO3.%B}  
 if(m_bAlt) |0N6]%r  
  mask|=2; JVxGS{Z  
 if(m_bShift) lo< t5~GQ  
  mask|=1; }fT5(+ Wo  
  key=Key_Table[m_Key.GetCurSel()]; :plN<8  
 if(bRegistered){ ZlG|U]mM5  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2uZ4$_  
  bRegistered=FALSE; R q |,@  
 } mi]bS  
 cMask=mask; :XFr"aSt  
 cKey=key; !9p;%Ny`  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); AS? ESDC  
 return bRegistered; |9'`;4W  
} kfj)`x  
X"Ca  
  四、小结 T0TgV  
($or@lfs  
  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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