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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: Dl C\sm  
  }"} z7Xb0  
  一、实现方法 So?.V4aD_  
3=[#(p:  
  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: ~kDR9s7  
'8%pEl^  
#pragma data_seg("shareddata") +Dvdv<+  
HHOOK hHook =NULL; //钩子句柄 2Y~UeJ_\Lq  
UINT nHookCount =0; //挂接的程序数目 TtZZjeg+V  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 TcB^Sctf  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 -Iq W@|N  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~bm VpoI  
static int KeyCount =0; _(J;!,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 T,' {0q  
#pragma data_seg() ZtzSG@f  
QuF76&)7  
  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。 Xk2M.:3`  
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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: N=2BrKb)o  
rw CFt6;v  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR rbC4/9G\  
cKey,UCHAR cMask) !T+jb\O_  
{ c L+-- $L  
 BOOL bAdded=FALSE; Mn)>G36(  
 for(int index=0;index<MAX_KEY;index++){ Oup5LH!sW  
  if(hCallWnd[index]==0){ iJ8 5okv'  
   hCallWnd[index]=hWnd; 8PN/*Sa  
   HotKey[index]=cKey; 0P MF)';R  
   HotKeyMask[index]=cMask; "zN2+X"&  
   bAdded=TRUE; :ik$@5wp  
   KeyCount++; Z)V m,ng  
   break; 3o).8b_3g  
  } aJ!(c}N~97  
 } +jpaBr-O#  
 return bAdded; $x5,Oen  
} N 3M:|D  
//删除热键 0LX"<~3j  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Sn o7Ru2  
{ @k< e]@r  
 BOOL bRemoved=FALSE; BIu%A]e"  
 for(int index=0;index<MAX_KEY;index++){ @ve4rc/LI  
  if(hCallWnd[index]==hWnd){ Ark+Df/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1/ZvcdYB  
    hCallWnd[index]=NULL; /KL;%:7  
    HotKey[index]=0; KBUClx?  
    HotKeyMask[index]=0; ,]:vk|a#;  
    bRemoved=TRUE; FWi c/7  
    KeyCount--; g&79?h4UXQ  
    break; th!$R  
   } bHJKX>@{  
  } M-#OPj*  
 } Lg;b17  
 return bRemoved; YN=dLr([<  
} SH oov  
su?{Cj6*  
96V@+I  
  DLL中的钩子函数如下: p3m!Iota  
mbf'xGO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;-aF\}D@n  
{ /]xu=q2  
 BOOL bProcessed=FALSE; $0-}|u]5U  
 if(HC_ACTION==nCode) 7@[HRr  
 { y_s^dQe  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 <N4)X"s  
   switch(wParam) *\-R&8  
   {  asT/hsSNS  
    case VK_MENU: {2A| F{7>  
     MaskBits&=~ALTBIT; Vxr_2Kra  
     break; 4$5d*7  
    case VK_CONTROL: t:NYsL  
     MaskBits&=~CTRLBIT; tQ,,krw~  
     break; Z.4 vKO[<  
    case VK_SHIFT: a&sVcsX  
     MaskBits&=~SHIFTBIT; "w PA;4VQ  
     break; miWPLnw=L  
    default: //judge the key and send message :,<G6"i  
     break; sI M^e  
   } S!LLC{  
   for(int index=0;index<MAX_KEY;index++){ U{ZE|b. ?b  
    if(hCallWnd[index]==NULL) 4qd =]i  
     continue; )td?t.4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) # NoY}*  
    { AX`>y@I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8+7n"6GY2/  
     bProcessed=TRUE; tQrF A2F  
    } .C 6wsmQ  
   } @Cnn8Y&'  
  } {OH @z!+d  
  else if((lParam&0xc000ffff)==1){ //有键按下 !Q/%N#  
   switch(wParam) s8r|48I#;  
   { G{ |0}  
    case VK_MENU: +t9$*i9`L  
     MaskBits|=ALTBIT; B% ]yLJ  
     break; A:-MRhE9X  
    case VK_CONTROL: nnzfKn:J  
     MaskBits|=CTRLBIT; jfLkp>2E'  
     break; |D@/4B1P  
    case VK_SHIFT: fZq_]1(/uP  
     MaskBits|=SHIFTBIT; \Zn%r&(  
     break; a/ 4!zT   
    default: //judge the key and send message uVSc1 MS1  
     break; 0h3 -;%  
   } ]j4Nl?5*x  
   for(int index=0;index<MAX_KEY;index++){ K)D5%?D  
    if(hCallWnd[index]==NULL) t PJW|wo  
     continue; H3}eFl=i2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hJ)\Vo  
    { 7EfLd+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =6sA49~M  
     bProcessed=TRUE; +i\ +bR  
    } q7z;bA  
   } .wdWs tQ  
  } >V01%fLd  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 5W Z9z-6  
   for(int index=0;index<MAX_KEY;index++){ !,SGKLs.m  
    if(hCallWnd[index]==NULL) Q; V*M  
     continue; p{V_}:|=Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) L~Hl?bK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `wMHjcUP  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 MrW*6jY@  
   } <FkoWN  
  } @nh* H{  
 } OBCH%\;g  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <P%<EgOE  
} FX->_}kL=  
2!w5eWl,  
  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: rfz\DvV d  
M*+MhM-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tc|`cB3f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?<*mIf:?  
RaT_5PH~g  
  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: hja;d1yH  
kPuI'EPK  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~Z{IdE  
{ ( !THd  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 'XbrO|%  
 { E7CeE6U  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 I6.!0.G  
  SaveBmp(); (V06cb*42[  
  return FALSE; 7\T~K Yb?  
 } hx5oTJR  
 …… //其它处理及默认处理 G\;a_]Q  
} ytDp 4x<W)  
7 6} a  
`R\nw)xq  
  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。 Miw*L;u@W  
+=N!37+G  
  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。 as k76  e  
x!i(M>P  
  二、编程步骤 |_} LMkU)  
,Fv8&tR  
  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"; _MI8P/  
46(=*iT&V  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 4Y>J,c  
p`PBPlUn  
  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; 6Hh\ys  
R.Uwf  
  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; 2~wIHtd  
3j h: K   
  5、 添加代码,编译运行程序。 ; 1^ ([>|  
+HpPVuV  
三、程序代码 S>6f0\F/Y%  
rsGQ :c  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ^^;#Si  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9_4bw9 A  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ nYvx[ zq?^  
#if _MSC_VER > 1000 8M~^/Zc  
#pragma once y$Y*%D^w  
#endif // _MSC_VER > 1000 ov9+6'zya  
#ifndef __AFXWIN_H__ VJf|r#2  
#error include 'stdafx.h' before including this file for PCH Uc[ @]  
#endif ?x\tE]  
#include "resource.h" // main symbols $oo`]R_   
class CHookApp : public CWinApp K8R}2K-Y  
{ !Z}d^$  
 public: CI}zu;4|  
  CHookApp(); 4H]~]?F&  
  // Overrides lG>,&(  
  // ClassWizard generated virtual function overrides bzC| aUGM  
  //{{AFX_VIRTUAL(CHookApp) 'LyEdlC]  
 public: tx9;8K3  
  virtual BOOL InitInstance(); X9S` #N  
  virtual int ExitInstance(); 2d:5~fEJp  
  //}}AFX_VIRTUAL cU[^[;4J<  
  //{{AFX_MSG(CHookApp) X%sMna)  
  // NOTE - the ClassWizard will add and remove member functions here. 6!;eJYj,  
  // DO NOT EDIT what you see in these blocks of generated code ! *URBx"5XZ  
  //}}AFX_MSG `p'(:W3a  
  DECLARE_MESSAGE_MAP() tW8&:L,m  
}; lR8Lfa*/7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); jI;iTKjB(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "dItv#<:}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dln1JZ!  
BOOL InitHotkey(); :,f~cdq=  
BOOL UnInit(); ;dR4a@  
#endif ALO0yc  
})#SjFq<V  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. iL6Yk @  
#include "stdafx.h" ,P.yl~'Al  
#include "hook.h" $-Yq?:  
#include <windowsx.h> q-lejVS(g  
#ifdef _DEBUG ?r}'0dW  
#define new DEBUG_NEW YR? ujN  
#undef THIS_FILE bZKlQ<sI  
static char THIS_FILE[] = __FILE__; 6]D%|R,Q#}  
#endif h@H8oZ[  
#define MAX_KEY 100 IHs^t/;Iv  
#define CTRLBIT 0x04 F^/b!)4X  
#define ALTBIT 0x02 f7y3BWOi]  
#define SHIFTBIT 0x01 @L/p  
#pragma data_seg("shareddata") brpsZU  
HHOOK hHook =NULL; ;&2f{  
UINT nHookCount =0; &$V&gAN  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ;J&p17~T9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #=81`u  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ]aDU*tk  
static int KeyCount =0; ?\.DG`Zxc  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift PCkQ hR  
#pragma data_seg() %vZTD +i  
HINSTANCE hins; 9()d7Y#d/`  
void VerifyWindow(); GLpl  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) x[dR5  
//{{AFX_MSG_MAP(CHookApp) YK V?I   
// NOTE - the ClassWizard will add and remove mapping macros here. ^fq^s T.$  
// DO NOT EDIT what you see in these blocks of generated code! v{44`tR   
//}}AFX_MSG_MAP x,rK4L7U  
END_MESSAGE_MAP() t)__J\xF  
Ui43&B  
CHookApp::CHookApp() {S6:LsFfm  
{ *]#(?W.$w  
 // TODO: add construction code here, } Tz<fd/  
 // Place all significant initialization in InitInstance ^8q(_#w`K  
} qPvWb1H:  
,ej89  
CHookApp theApp;  d  H ;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) x Rp;y*  
{ 4F=cER6l  
 BOOL bProcessed=FALSE; /qwl;_Jcf  
 if(HC_ACTION==nCode) ">|G^ @|:A  
 { 1. S?(1e"  
  if((lParam&0xc0000000)==0xc0000000){// Key up E/:mO~1< c  
   switch(wParam) M!D&a)\  
   { U-6pia /o  
    case VK_MENU: xro%AM  
     MaskBits&=~ALTBIT; }1}L&M@  
     break; iU1yJ=  
    case VK_CONTROL: /9o gg  
     MaskBits&=~CTRLBIT; cqSo%a2  
     break; vvwQ/iJO4Q  
    case VK_SHIFT: \\d!z-NOk?  
     MaskBits&=~SHIFTBIT; >gSiH#>  
     break; 7mT iO?/y<  
    default: //judge the key and send message TYH4r q &  
     break; ,3P@5Ef  
   } S9mcThcZ  
   for(int index=0;index<MAX_KEY;index++){ TR J5m?x  
    if(hCallWnd[index]==NULL) "IuHSjP  
     continue; &WV&_z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /y-eVu6  
    { fP>~ @^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _@L{]6P%V  
     bProcessed=TRUE; $O[$<D%H  
    } |]UR&*  
   } N/V~>UJ0{*  
  } HD~o]l=H  
  else if((lParam&0xc000ffff)==1){ //Key down L}hc|(:  
   switch(wParam) Gzw9E.Hk  
   { ^/M-*U8ab  
    case VK_MENU: l+XTn;cS  
     MaskBits|=ALTBIT; sogdM{tz\  
     break; *P; cSx?2  
    case VK_CONTROL: Vm]xV_FOd  
     MaskBits|=CTRLBIT; R|g50Q  
     break; $Le|4Hj  
    case VK_SHIFT: J-U5_>S  
     MaskBits|=SHIFTBIT; (ptk!u6  
     break;  &peUC n  
    default: //judge the key and send message !3;KC"o  
     break; jM5w<T-2/  
   } < pWk   
   for(int index=0;index<MAX_KEY;index++) +zL|j/q?  
   { duq(K9S  
    if(hCallWnd[index]==NULL) |)[I$]L  
     continue; S(ky:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kb~;s-$O`s  
    { >[r,X$]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n1    
     bProcessed=TRUE; Usl963A#'F  
    } A3s-C+@X  
   } HS@ EV iht  
  } E(p#Je|@[  
  if(!bProcessed){ 0@LC8Bz+'  
   for(int index=0;index<MAX_KEY;index++){ U.A:'9K,  
    if(hCallWnd[index]==NULL) d9Uv/VGp  
     continue; N_liKhq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) k esuM3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); C;\R 62'  
   } 6 6C_XT  
  } 1a]QNl_x  
 } UNF@%O4_T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); DcRvZH  
} >`=9So_J  
k; (r:k^  
BOOL InitHotkey() R|'ftFebB.  
{ &\m=|S  
 if(hHook!=NULL){ ,p)Qu%'  
  nHookCount++; 12o6KVV^x  
  return TRUE; ?8-ho0f0  
 } xtFGj,N  
 else 5MHc gzyp  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #D ]P3  
  if(hHook!=NULL) ^|UD&6 dx  
   nHookCount++; KbGz3O'u  
  return (hHook!=NULL); Ux-i iH#s  
} S.R|Bwj}(Y  
BOOL UnInit() }'WEqNuE  
{ sL4j@Lt  
 if(nHookCount>1){ xRbtiFk9H  
  nHookCount--; *&doI%q  
  return TRUE; rr^?9M*{V  
 } dGG8k&  
 BOOL unhooked = UnhookWindowsHookEx(hHook); bZlKy`Z  
 if(unhooked==TRUE){ K:q|M?_  
  nHookCount=0; Y|nC_7&Bv  
  hHook=NULL; :-tMH02c  
 } +[2ep"5H  
 return unhooked; 3,^.  
} ngOGo =  
l}_6 _g>6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oxNQNJ!X  
{ ,lDOo+eE%:  
 BOOL bAdded=FALSE; &2sfu0K  
 for(int index=0;index<MAX_KEY;index++){ ^E&WgXlb  
  if(hCallWnd[index]==0){ !6FO[^h||H  
   hCallWnd[index]=hWnd; [79iC$8B|  
   HotKey[index]=cKey; ;iO5 8S3  
   HotKeyMask[index]=cMask; 5kLz8n^z@@  
   bAdded=TRUE; uJSzz:\  
   KeyCount++; e]*@|e4b  
   break; U W' @3#<?  
  } %\] x}IC  
 } trz &]v=:  
 return bAdded; |a!]Iqz"N  
} @kWRI*m  
z#*> u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Oh5aJ)"D  
{ 3YD.Fjz$  
 BOOL bRemoved=FALSE; xQDWnpFc  
 for(int index=0;index<MAX_KEY;index++){ #<DS-^W!  
  if(hCallWnd[index]==hWnd){ x4XCR,-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ dLbSvK<(I  
    hCallWnd[index]=NULL; yYiu69v  
    HotKey[index]=0; V*gh"gZ<  
    HotKeyMask[index]=0; _)ZxD--Qg  
    bRemoved=TRUE; ;T :]?5W!  
    KeyCount--; pEq }b+-  
    break; in7h^6?I  
   } 2" u,f  
  } PW+B&7{  
 } 0]xp"xOwW  
 return bRemoved; MW|R)gt  
} +vIsYg*#2M  
cRv#aV  
void VerifyWindow() s"~3.J  
{ |3G;Rh9w,  
 for(int i=0;i<MAX_KEY;i++){ 3(`P x}  
  if(hCallWnd!=NULL){ rGlnu.mK^  
   if(!IsWindow(hCallWnd)){ n;LjKE  
    hCallWnd=NULL; a FL; E  
    HotKey=0; H,EGB8E2  
    HotKeyMask=0; PZihC  
    KeyCount--; !3)WW)"!r  
   } 6h7TM?lt  
  } yJW/yt.l  
 } uj@d {AQ  
} K(#O@Wmjq  
8'M:uI  
BOOL CHookApp::InitInstance() {a0yHy$H  
{ IXpn(vX  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Zp/$:ny  
 hins=AfxGetInstanceHandle(); 3z% W5[E)  
 InitHotkey(); `(M0I!t  
 return CWinApp::InitInstance(); 0i(c XB  
} IZBY*kr  
Y+{jG(rg.F  
int CHookApp::ExitInstance() NUFW SL>  
{ _&N}.y)+t  
 VerifyWindow(); rV}&G!V_t  
 UnInit(); v8K`cijSS  
 return CWinApp::ExitInstance(); .Bojb~zt  
} 1 %8JMq\  
3F32 /_`  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file OMAvJzK .  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &qP0-x)  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ bnZ H  
#if _MSC_VER > 1000 nP_)PDTFp  
#pragma once ART0o7B  
#endif // _MSC_VER > 1000 BS3{TGn  
m(`O>zS  
class CCaptureDlg : public CDialog ! ~tf0aY  
{ Q5HSik4  
 // Construction \_x~lRqJJ  
 public:  54#P  
  BOOL bTray;  'Pxq>Os  
  BOOL bRegistered; CU:HTz=  
  BOOL RegisterHotkey(); +F*h\4ry#  
  UCHAR cKey; q6}KOO)  
  UCHAR cMask; "c+$GS  
  void DeleteIcon(); }#S1!TU  
  void AddIcon(); "s}Oeu[  
  UINT nCount; gYBMi)`RT  
  void SaveBmp(); v.hQ 9#:  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor $HCgawQ  
  // Dialog Data *U- :2uf  
  //{{AFX_DATA(CCaptureDlg) T+oOlug  
  enum { IDD = IDD_CAPTURE_DIALOG }; B!U;a=ia  
  CComboBox m_Key; [I}z\3Z %  
  BOOL m_bControl; ueEf>0  
  BOOL m_bAlt; DFvGc`O4  
  BOOL m_bShift; "^)GnK +-  
  CString m_Path; b[J0+l\!"  
  CString m_Number; /=g/{&3[a>  
  //}}AFX_DATA Yl =-j  
  // ClassWizard generated virtual function overrides >[;L.  
  //{{AFX_VIRTUAL(CCaptureDlg) 8erG](  
 public: +J#8w h  
  virtual BOOL PreTranslateMessage(MSG* pMsg); wVs"+4l<  
 protected: _bt9{@)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]Y@_2`  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); jVh:Bw  
  //}}AFX_VIRTUAL WF:4p]0~)  
  // Implementation V9jxmu F,  
 protected: %/ "yt}"|  
  HICON m_hIcon; 2#ZqGf.'v  
  // Generated message map functions Bo\~PV[  
  //{{AFX_MSG(CCaptureDlg) 8tVSai8[  
  virtual BOOL OnInitDialog(); x~=Mn%Ew0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Ze <)B *  
  afx_msg void OnPaint(); 8Ltl32JSB[  
  afx_msg HCURSOR OnQueryDragIcon(); Yr>0Qg],  
  virtual void OnCancel(); b1;h6AeL  
  afx_msg void OnAbout(); ]E)\>Jb  
  afx_msg void OnBrowse(); 'bsHoO  
  afx_msg void OnChange(); C DoD9Hq,  
 //}}AFX_MSG `z$P,^g`  
 DECLARE_MESSAGE_MAP() UyFC\vQ  
}; 4sW'pH  
#endif u%lUi2P2E  
kP'm$+1or  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file p:W{c/tV  
#include "stdafx.h" 5nTcd@lX  
#include "Capture.h" hy>0'$mU  
#include "CaptureDlg.h" )5n:UD{f[#  
#include <windowsx.h> Q @[gj:w  
#pragma comment(lib,"hook.lib") O<#8R\v  
#ifdef _DEBUG p5% %k-  
#define new DEBUG_NEW /nv+*+Q?d  
#undef THIS_FILE : dNJ2&kJ  
static char THIS_FILE[] = __FILE__; Gpi_p  
#endif ,Xr`tQ<@  
#define IDM_SHELL WM_USER+1 bI`JG:^b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0 /9 C=v  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |3 Iug  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [4aw*M1z}.  
class CAboutDlg : public CDialog @4MQ021(  
{ oo BBg@  
 public: S^ D7}  
  CAboutDlg(); ><S(n#EB  
  // Dialog Data o 0T1pGs'  
  //{{AFX_DATA(CAboutDlg) gf?N(,  
  enum { IDD = IDD_ABOUTBOX }; i=1crJ:  
  //}}AFX_DATA EJRkFn8XG'  
  // ClassWizard generated virtual function overrides Ke=+D'=  
  //{{AFX_VIRTUAL(CAboutDlg) 6kMkFZ}+  
 protected: aGfp"NtL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e]CoYuPr  
  //}}AFX_VIRTUAL "R=~-, ~  
  // Implementation |,~ )/o_R  
 protected: z' Z[mrLq  
  //{{AFX_MSG(CAboutDlg) :KR KD  
  //}}AFX_MSG ?#fm-5WIi  
  DECLARE_MESSAGE_MAP() I>##iiKN  
}; 7 \[fjCg\w  
3o0ZS^#eB  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) xRdx` YYu  
{ {jH'W)nR  
 //{{AFX_DATA_INIT(CAboutDlg) M<*WC{  
 //}}AFX_DATA_INIT U=7nz|  
} z@w}+fYO  
JZ~wacDd  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %n GjP^  
{ 4Gh\T`=  
 CDialog::DoDataExchange(pDX); ml Cg&fnDB  
 //{{AFX_DATA_MAP(CAboutDlg) 1e7I2g  
 //}}AFX_DATA_MAP ek U%^R<  
} (9kR'kr  
WUo\jm[yr  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) `34{/ }w  
 //{{AFX_MSG_MAP(CAboutDlg) /HS"{@Z"h  
 // No message handlers 0FY-e~xr  
 //}}AFX_MSG_MAP &%GAPs%  
END_MESSAGE_MAP() iK+Vla`}  
Jp%5qBS^  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) hvQXYo>TZx  
: CDialog(CCaptureDlg::IDD, pParent) %4Qs|CM)m  
{ {qbe ye!  
 //{{AFX_DATA_INIT(CCaptureDlg) :>r W`= e'  
  m_bControl = FALSE; uv<_.Jq]  
  m_bAlt = FALSE; zx,9x*g  
  m_bShift = FALSE; So8 Dwz?  
  m_Path = _T("c:\\"); T:zM]%Xh  
  m_Number = _T("0 picture captured."); :=TIq  
  nCount=0; 1_A_)l11  
  bRegistered=FALSE; IGT9}24  
  bTray=FALSE; SD{)Sq  
 //}}AFX_DATA_INIT DW78SoyedZ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $evuL3GY#  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Kd5 8'$  
} `'sD(e  
!lo /L  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) al-rgh  
{ NdSuOkwwt  
 CDialog::DoDataExchange(pDX); Ej 5_d  
 //{{AFX_DATA_MAP(CCaptureDlg) bk;uKV+<  
  DDX_Control(pDX, IDC_KEY, m_Key); yjMN>L'  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); deVnAu =  
  DDX_Check(pDX, IDC_ALT, m_bAlt); y+w,j]  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {j;` wN  
  DDX_Text(pDX, IDC_PATH, m_Path); |2@*?o"ll  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ; :q  
 //}}AFX_DATA_MAP m4m|?  
} 4OQ,|Wm4G  
h.F=Fhx/1  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) k4hk* 0Jq  
//{{AFX_MSG_MAP(CCaptureDlg) r 1jt~0&K  
 ON_WM_SYSCOMMAND() A_9J ~3  
 ON_WM_PAINT() ^3S&LC 1;|  
 ON_WM_QUERYDRAGICON() V$w lOMp  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) =-X-${/  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  7gZ}Qy  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Mqvo j7  
//}}AFX_MSG_MAP f7][#EL  
END_MESSAGE_MAP() 3 V>$H\H  
H,5]w\R6\  
BOOL CCaptureDlg::OnInitDialog() kltW  
{ *o4a<.hd2  
 CDialog::OnInitDialog(); Uc'}y!R  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )RvX}y-  
 ASSERT(IDM_ABOUTBOX < 0xF000); g#^MO]pY  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Iz#4!E|<  
 if (pSysMenu != NULL) .(.<  
 { !|i #g$  
  CString strAboutMenu; ;H.V-~:P)  
  strAboutMenu.LoadString(IDS_ABOUTBOX);  Owi/e  
  if (!strAboutMenu.IsEmpty()) ujS oWs  
  { n=C"pH#  
   pSysMenu->AppendMenu(MF_SEPARATOR); b=_k)h+l  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); eh `%E0b}  
  } %K-8DL8|(  
 } '&B4Ccn<V  
 SetIcon(m_hIcon, TRUE); // Set big icon H~nZ=`P9&  
 SetIcon(m_hIcon, FALSE); // Set small icon FX|&o >S(8  
 m_Key.SetCurSel(0); {&mH fN  
 RegisterHotkey(); >h#w~@e::  
 CMenu* pMenu=GetSystemMenu(FALSE); Es)|#0m\x@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Y$\|rD^f  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); matna  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); c>{QTI:]  
 return TRUE; // return TRUE unless you set the focus to a control M3O !jN~  
} 2M'dT Xz  
$*iovam>^]  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]VLseF  
{ ?_^{9q%9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Q N#bd~  
 { j]<K%lwp  
  CAboutDlg dlgAbout; B5|\<CF  
  dlgAbout.DoModal(); }UB@FRPF  
 } S#y[_C?H  
 else U4 \v~n\  
 { J;8 d-R5  
  CDialog::OnSysCommand(nID, lParam); nWY^?e'S  
 } 7g(Z @  
} (BeJ,K7  
6`@J=Q?  
void CCaptureDlg::OnPaint() #o4tG  
{ -dBWpT  
 if (IsIconic()) ]kTxVe  
 { &k%>u[Bo  
  CPaintDC dc(this); // device context for painting /G'3!S  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); A8*zB=C  
  // Center icon in client rectangle U].]K   
  int cxIcon = GetSystemMetrics(SM_CXICON); ~Ss,he]Er  
  int cyIcon = GetSystemMetrics(SM_CYICON); ][v]Nk  
  CRect rect; LrbD%2U$j5  
  GetClientRect(&rect); D\-\U E/  
  int x = (rect.Width() - cxIcon + 1) / 2; o#,^7ln  
  int y = (rect.Height() - cyIcon + 1) / 2; yvoz 3_!  
  // Draw the icon 7\,9Gcv1  
  dc.DrawIcon(x, y, m_hIcon); bC1G5`v_D  
 } !LwHKCj  
 else ~Q]5g7k=&  
 { ,Q7;(&x~  
  CDialog::OnPaint(); DJ:'<"zH7  
 } poxF`a6e+  
} G_S>{<[  
G#7(6:=;,`  
HCURSOR CCaptureDlg::OnQueryDragIcon() ud$-A  
{ E6-*2U)k+  
 return (HCURSOR) m_hIcon; M lR~`B}m  
} x'I!f? / &  
</`\3t  
void CCaptureDlg::OnCancel() ?}4,s7PR  
{ ebQgk Y=  
 if(bTray) :1>?:3,`  
  DeleteIcon(); @ gWd  
  CDialog::OnCancel(); -m%`Di!E  
} d9M[]{  
/GC&@y0yi  
void CCaptureDlg::OnAbout() F9u?+y-xb  
{ 5MAfuHq^  
 CAboutDlg dlg; ^F+7<$ 2  
 dlg.DoModal(); 1d<Uwb>  
} CC`_e^~y=F  
ezp%8IZ;  
void CCaptureDlg::OnBrowse() ^0OP&s;"  
{ bTaKB-  
 CString str; i9DD)Y<  
 BROWSEINFO bi; M>]A! W=  
 char name[MAX_PATH]; \MOwp@|y  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); j,+]tHC-  
 bi.hwndOwner=GetSafeHwnd(); #Or;"}P>fB  
 bi.pszDisplayName=name; o6k#neB>=.  
 bi.lpszTitle="Select folder"; $z jdCg<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 5?^L))  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); x1.S+:  
 if(idl==NULL) /q]rA  
  return; f|~{j(.v  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); T"_'sSI>tF  
 str.ReleaseBuffer(); 4?'vP'  
 m_Path=str; WYUDD_m  
 if(str.GetAt(str.GetLength()-1)!='\\') mOsp~|d  
  m_Path+="\\"; =Nxkr0])!  
 UpdateData(FALSE); WQ.0}n}d  
} 1*TbgxS~W  
WK>|IgK  
void CCaptureDlg::SaveBmp() ^Fco'nlM  
{ 0- )K_JV  
 CDC dc; E=p+z"Ui  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); c0gVW~I1  
 CBitmap bm; ;mG*Rad  
 int Width=GetSystemMetrics(SM_CXSCREEN); `.W2t5 Y  
 int Height=GetSystemMetrics(SM_CYSCREEN); `x`[hJ?i  
 bm.CreateCompatibleBitmap(&dc,Width,Height); DVL-qt\;n  
 CDC tdc; "0P`=n  
 tdc.CreateCompatibleDC(&dc); 20|`jxp  
 CBitmap*pOld=tdc.SelectObject(&bm); \xkKgI/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); -Lh7!d  
 tdc.SelectObject(pOld); T$xB H  
 BITMAP btm; 56 3mz-  
 bm.GetBitmap(&btm); tX{yR'Qhu  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; pa[/6(  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~P1~:AT  
 BITMAPINFOHEADER bih; P2-&Im`+  
 bih.biBitCount=btm.bmBitsPixel; {_O!mI*  
 bih.biClrImportant=0; bP&QFc  
 bih.biClrUsed=0; ixd sz\<  
 bih.biCompression=0; 0D s3wNz  
 bih.biHeight=btm.bmHeight; 20;9XJmjl  
 bih.biPlanes=1; `r`8N6NQ&]  
 bih.biSize=sizeof(BITMAPINFOHEADER); :}lqu24K  
 bih.biSizeImage=size; X g6ezlW  
 bih.biWidth=btm.bmWidth; FPDTw8" B;  
 bih.biXPelsPerMeter=0; CI'RuR3y]Z  
 bih.biYPelsPerMeter=0; iAwEnQ3h  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); li r=0oq<  
 static int filecount=0; T }}2J/sj  
 CString name; '+PKGmRW  
 name.Format("pict%04d.bmp",filecount++); `<C<[JP:o  
 name=m_Path+name; 9{toPED  
 BITMAPFILEHEADER bfh; <-umeY"n>  
 bfh.bfReserved1=bfh.bfReserved2=0; Wh)D_  
 bfh.bfType=((WORD)('M'<< 8)|'B'); d#g))f;  
 bfh.bfSize=54+size; 4+RR`I8$Ge  
 bfh.bfOffBits=54; @%]A,\  
 CFile bf; 4I$Y(E}  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ AI-*5[w#A  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2*|T)OA`m,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); k {*QU(  
  bf.WriteHuge(lpData,size); ysW})#7X  
  bf.Close(); >NRppPqL  
  nCount++; ky2 bj}"p9  
 } FlBhCZ|^  
 GlobalFreePtr(lpData); FE~D:)Xj'?  
 if(nCount==1) Z7;V}[wie  
  m_Number.Format("%d picture captured.",nCount); _QPqF{iI  
 else e5|lz.o;  
  m_Number.Format("%d pictures captured.",nCount); #).$o~1ht!  
  UpdateData(FALSE); fjh|V9H  
} C$OVN$lL`8  
2%W;#oi?  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) uzy5rA==  
{ 9P?0D  
 if(pMsg -> message == WM_KEYDOWN) pM?;QG;jA  
 { JE?rp1.  
  if(pMsg -> wParam == VK_ESCAPE) Zse&{  
   return TRUE; $9)os7H7  
  if(pMsg -> wParam == VK_RETURN) >HP `B2Q H  
   return TRUE; 8>&@"j  
 } #S}orWj  
 return CDialog::PreTranslateMessage(pMsg); VI0wul~M  
} v ,8;: sD  
<RGH+4LF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~KBa-i%o  
{ kA:mB;:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ v/+ <YU  
  SaveBmp(); Re$h6sh  
  return FALSE; G;Li!H  
} Nd~B$venh  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ s2; ~FK#/  
 CMenu pop; uoS:-v}/Y~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); G{U#9   
 CMenu*pMenu=pop.GetSubMenu(0); `JySuP2~/  
 pMenu->SetDefaultItem(ID_EXITICON); 36 "n7  
 CPoint pt; cb}"giXQTB  
 GetCursorPos(&pt); (Xd8'-G$m  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); X3.zNHN5  
 if(id==ID_EXITICON) 0a~t  
  DeleteIcon(); m=dNJF  
 else if(id==ID_EXIT) !}(B=-  
  OnCancel(); 9`tK 9  
 return FALSE;  G 3Z"U  
} D)d]o&  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); T+kV~ w{  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) fkA+:j~z_  
 AddIcon(); mq`/nAmt  
 return res; 6_CP?X+T  
} Npp YUY  
ov6xa*'a  
void CCaptureDlg::AddIcon() sy: xA w  
{ 4Yj1Etq.E  
 NOTIFYICONDATA data; OW7  
 data.cbSize=sizeof(NOTIFYICONDATA);  YKyno?m  
 CString tip; ;J%:DD  
 tip.LoadString(IDS_ICONTIP); s|=lKa]d!"  
 data.hIcon=GetIcon(0); Q Be6\oq  
 data.hWnd=GetSafeHwnd(); SyWZOE%p  
 strcpy(data.szTip,tip); :gVUk\)  
 data.uCallbackMessage=IDM_SHELL; V ao:9 ~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; "-~ 7lY%  
 data.uID=98; |5&+VI  
 Shell_NotifyIcon(NIM_ADD,&data);  ;Shu  
 ShowWindow(SW_HIDE); Y|>dS8f;4  
 bTray=TRUE; VoU8I ~  
} {)[o*+9  
u#0snw~)/  
void CCaptureDlg::DeleteIcon() ]}2)U  
{ w0Qtr>"  
 NOTIFYICONDATA data; ,;k+n)  
 data.cbSize=sizeof(NOTIFYICONDATA); osW"wh_  
 data.hWnd=GetSafeHwnd(); e &6%  
 data.uID=98; TZn 15-O  
 Shell_NotifyIcon(NIM_DELETE,&data); %w`d  
 ShowWindow(SW_SHOW); m'o dVZ7  
 SetForegroundWindow(); .wfydu)3  
 ShowWindow(SW_SHOWNORMAL); SE'Im  
 bTray=FALSE; d:=' Xs  
} g'"~'  
#}`sfaT  
void CCaptureDlg::OnChange() ~6G `k^!  
{ &7L7|{18  
 RegisterHotkey(); @X==[gQ  
} q+ax]=w  
:U6` n  
BOOL CCaptureDlg::RegisterHotkey() e4z`:%vy  
{ *uvM6F$ut  
 UpdateData(); $y(;"hy  
 UCHAR mask=0; Obs#2>h  
 UCHAR key=0; wlS/(:02  
 if(m_bControl) ,06Sm]4L,  
  mask|=4; 3I6ocj [,  
 if(m_bAlt) }vndt*F   
  mask|=2; (b&g4$!x&5  
 if(m_bShift) d0El2Ct8  
  mask|=1; 7'0Vb !(  
  key=Key_Table[m_Key.GetCurSel()]; kiTC)S=])  
 if(bRegistered){ Ji4p6$ .j-  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); >F/^y O  
  bRegistered=FALSE; YQMWhC,8hy  
 } ^Q/*on;A,/  
 cMask=mask; [+ud7l  
 cKey=key; XT7m3M  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Myq8`/_  
 return bRegistered; DT-VxF6h  
} `4Yo-@iVP  
s9 - qR_  
  四、小结 ejN/U{)jK'  
u`bD`kfT>  
  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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