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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: rmabm\QY  
  :%>8\q>UX  
  一、实现方法 M`>W'<  
RChY+3,L)  
  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: LqUvEq  
3FXMM&w  
#pragma data_seg("shareddata") gx6&'${=#  
HHOOK hHook =NULL; //钩子句柄 8uT6QCf  
UINT nHookCount =0; //挂接的程序数目 .|aSGv E  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 aJ}sYf^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 pc.0;g N  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3?%kawO&  
static int KeyCount =0; <>e<Xd:77{  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 W@ Z=1y  
#pragma data_seg() X*JD  
H9>&"=".  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 AN%.LK  
2ga}d5lu  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 4`UT_LcI  
; Q 6:#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =#^dG ''*"  
cKey,UCHAR cMask) 0sUc6_>e  
{ <+$S{Z.  
 BOOL bAdded=FALSE; `UI)H*GA8  
 for(int index=0;index<MAX_KEY;index++){ > Qtyw.n  
  if(hCallWnd[index]==0){ .lFSFJ??  
   hCallWnd[index]=hWnd; IRU2/Ycg  
   HotKey[index]=cKey; gU~)(|Nu.  
   HotKeyMask[index]=cMask; up1aFzY|6x  
   bAdded=TRUE; c:6w >:  
   KeyCount++; qnS7z%H8  
   break; IY19G U9  
  } Kulg84<AwM  
 } B.G!7>=  
 return bAdded; *Qf }4a0  
} 7wqwDE  
//删除热键 #NE^f2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Tk!b`9  
{ \k,bz 0  
 BOOL bRemoved=FALSE; M/DTD98'N  
 for(int index=0;index<MAX_KEY;index++){ 9F+bWo_m  
  if(hCallWnd[index]==hWnd){ >ahj|pm  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ h|H;ZC(B  
    hCallWnd[index]=NULL; ye%F <:O7  
    HotKey[index]=0; 6,)y{/ENC  
    HotKeyMask[index]=0; C IDL{i8  
    bRemoved=TRUE; S|J8:-  
    KeyCount--; bVx]r[  
    break; mTPj@F>  
   } CHU'FSq!  
  } :mrGB3x{  
 } /trc&V  
 return bRemoved; h+W^k+~(  
} O9_YVE/-]  
)QE_+H}p  
10J*S[n1  
  DLL中的钩子函数如下: xY S%dLE"  
YXtGuO\q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) d<Os TA  
{ v wyDY%B"n  
 BOOL bProcessed=FALSE; :=Q|gRTL*  
 if(HC_ACTION==nCode) _+N^yw,r*  
 { Pc7: hu  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [5VUcXGt*\  
   switch(wParam) 1IV 0a  
   {  f UIs(}US  
    case VK_MENU: o W[,EW+u  
     MaskBits&=~ALTBIT; [:QMnJ  
     break; nX~MoWH1  
    case VK_CONTROL: -!0LIr:"  
     MaskBits&=~CTRLBIT; /wTf&_"mTL  
     break; [86'/:L\2  
    case VK_SHIFT: a  98  
     MaskBits&=~SHIFTBIT; *lK4yI*%o  
     break; XOCau.#  
    default: //judge the key and send message 8w&rj-  
     break; FJLJ;]`7+  
   } {K:Utdu($q  
   for(int index=0;index<MAX_KEY;index++){ Fsf22  
    if(hCallWnd[index]==NULL) qX(%Wn;n  
     continue; gQuw|u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L0kNt &di  
    { vb- .^l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?I'-C?(t@1  
     bProcessed=TRUE; v-3zav  
    } r?!xL\C\  
   } J,O@T)S@  
  } m GhJn  
  else if((lParam&0xc000ffff)==1){ //有键按下 &-fx=gq=  
   switch(wParam) Jg:-TK/  
   { 6^|6V  
    case VK_MENU: :\U3bkv+  
     MaskBits|=ALTBIT; sAoM=n}!  
     break; zy[=OX+  
    case VK_CONTROL: GC[{=]}9U  
     MaskBits|=CTRLBIT; .$0Ob<.  
     break; m0Syxb  
    case VK_SHIFT: ~TH5>``;gF  
     MaskBits|=SHIFTBIT; `yAo3A9vk  
     break; M0SH-0T;Z  
    default: //judge the key and send message pV6HQ:y1  
     break; 358/t/4 {p  
   } Pm^N0L9?q  
   for(int index=0;index<MAX_KEY;index++){ ~(j'a!#Vvk  
    if(hCallWnd[index]==NULL) xLI{=sL  
     continue; N1~V +_mM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  |{)xC=  
    { (nD$%/uK'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1fFb 7n~3  
     bProcessed=TRUE; S;Z3v)E-f  
    } &fW=5'  
   } yCIgxPv|7  
  } U"+ ry.3`  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ig}e@]  
   for(int index=0;index<MAX_KEY;index++){ Qe$>Jv5  
    if(hCallWnd[index]==NULL) !>< %\K  
     continue; r ` &|)Hx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) yim$y, =d  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /:` i%E  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 pPqN[OJ  
   } 0;v~5|r  
  } Sz|CreFK16  
 } %hbLT{w  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,/6:bc:W  
} (?BgT i\  
p@Y$eZ:O  
  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: &}0wzcMg  
TucAs 0-bF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8Wx@[!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Om2X>/V%C  
_P<lG[V  
  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: KWJgW{{v  
:6$4K"^1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +;*(a3Gp  
{ 18"VB50b}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 2nU NI U  
 { iW@Vw{|i I  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 1m`tqlFU9  
  SaveBmp(); 7~ese+\smG  
  return FALSE; o,Zng4NY  
 } i!W8Q$V  
 …… //其它处理及默认处理 S@xsAib0J  
} pLQSG}N  
!mxh]x<e  
o9LD6$  
  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。 F|Dz]ar  
DIqT>HHZ  
  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。 pOVghllO  
zrU$SWU  
  二、编程步骤 .Spi$>v  
QHzX 5$IM  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; .x!7  
StZRc\k  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; >3`ctbe  
nqxq@.L2  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; VuMDV6^Z  
sRyw\v-=P  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 2v9s@k/k)6  
K%c ATA3  
  5、 添加代码,编译运行程序。 "56?/ jF  
+Bq}>  
三、程序代码 gLaO#cQ%  
=3sldKL&F  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL HCjn9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) :@>br+S  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ D d# SUQ  
#if _MSC_VER > 1000 SZ2q}[o`R  
#pragma once } C{}oLz  
#endif // _MSC_VER > 1000 vYSetAd v  
#ifndef __AFXWIN_H__ d0A\#H_&  
#error include 'stdafx.h' before including this file for PCH Ef`5fgp? S  
#endif sK 1m9  
#include "resource.h" // main symbols +:"6`um|  
class CHookApp : public CWinApp {1@4}R4  
{ ^[seK)S=  
 public: r$r&4d Y  
  CHookApp(); k~jKJb-_  
  // Overrides L_gsG|xX  
  // ClassWizard generated virtual function overrides aC,vh1")F  
  //{{AFX_VIRTUAL(CHookApp) < k+fKl  
 public: e.}3OK  
  virtual BOOL InitInstance(); *mQDS.'AB@  
  virtual int ExitInstance(); RC8)f8n  
  //}}AFX_VIRTUAL QFNz9c  
  //{{AFX_MSG(CHookApp) ^?6 W<  
  // NOTE - the ClassWizard will add and remove member functions here. {rb-DB-/5M  
  // DO NOT EDIT what you see in these blocks of generated code ! q3x;_y^  
  //}}AFX_MSG Q}Ze-JIL$  
  DECLARE_MESSAGE_MAP() Ie2w0Cs28  
}; .hQ3A"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); =tf@4_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [)H,zpl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 11B{gUv.]  
BOOL InitHotkey(); Y-%l7GErhL  
BOOL UnInit(); _ 7BF+*T  
#endif Y*kh$E%<#  
qXU:A-IdIl  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Z9"{f)T  
#include "stdafx.h" \2R`q*a+  
#include "hook.h" KO-Zz&2f  
#include <windowsx.h> z[5Y Z~}*  
#ifdef _DEBUG -; us12SZ  
#define new DEBUG_NEW P^b:?%  
#undef THIS_FILE yul<n>X|  
static char THIS_FILE[] = __FILE__; ~"JE![XR  
#endif Uin k  
#define MAX_KEY 100 i9&K  
#define CTRLBIT 0x04 7#Uz*G\iZ  
#define ALTBIT 0x02 &N/|(<CB  
#define SHIFTBIT 0x01 ~ ^rey  
#pragma data_seg("shareddata") bIb6yVnHi  
HHOOK hHook =NULL; k+WO &g*|  
UINT nHookCount =0; G>=9gSLM  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey s<Ex"+  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ReI=4Jq11  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 5w,lw  
static int KeyCount =0; *or2  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift _'!N q  
#pragma data_seg() L876$  
HINSTANCE hins; l$k]O  
void VerifyWindow(); vLv|SqD  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) IW1GhZ41'  
//{{AFX_MSG_MAP(CHookApp) 1A%N0#_(Md  
// NOTE - the ClassWizard will add and remove mapping macros here. tDC0-N&6S~  
// DO NOT EDIT what you see in these blocks of generated code! MPKpS3VS  
//}}AFX_MSG_MAP ~j/bCMEf!  
END_MESSAGE_MAP() 1N!Oslum  
<pTQpU  
CHookApp::CHookApp() er[" NSo  
{ ~^lH ^J   
 // TODO: add construction code here, 4i_spF-3  
 // Place all significant initialization in InitInstance MiSja#"+A  
} ]5} -y3  
lL:KaQ0E  
CHookApp theApp; A~6%,q@^jh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6[+\CS7Lt  
{ <CZI7]PM7  
 BOOL bProcessed=FALSE; LyuSZa]  
 if(HC_ACTION==nCode) MekT?KPQ{L  
 { 6CcB-@n4  
  if((lParam&0xc0000000)==0xc0000000){// Key up '[>\N4WD  
   switch(wParam) Y|%anTP  
   { $i,6B9  
    case VK_MENU: q Z8|B  
     MaskBits&=~ALTBIT; G0I~&?nDa  
     break; r/mA2  
    case VK_CONTROL: a&$Zpf!!  
     MaskBits&=~CTRLBIT; 5nMkd/  
     break; h^o+E2<]  
    case VK_SHIFT: &K5C=]4  
     MaskBits&=~SHIFTBIT; uSABh ^  
     break; pT("2:)x  
    default: //judge the key and send message V*6l6-y~Ih  
     break; l;XU#6{  
   } gHQPhe#n  
   for(int index=0;index<MAX_KEY;index++){ TqS2!/jp  
    if(hCallWnd[index]==NULL) /hm84La  
     continue; u:_sTfKm&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'ox0o:  
    { [kPD`be2#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); d{QMST2&  
     bProcessed=TRUE; &_"ORqn&  
    } ^y&q5p jj  
   } ;\<""Yj@l  
  } FX%t  
  else if((lParam&0xc000ffff)==1){ //Key down '8s>rH5[V  
   switch(wParam) +mJ :PAy4  
   { = E&b=  
    case VK_MENU: zWy ,Om8P  
     MaskBits|=ALTBIT; W3 De|V^  
     break; J?._/RL8-  
    case VK_CONTROL: qq OxTG]  
     MaskBits|=CTRLBIT; fA"<MslKLK  
     break; -h>Z,-DE6  
    case VK_SHIFT: r0)JUc}Fyq  
     MaskBits|=SHIFTBIT; 8 ne/=N|,  
     break; c*N50%=4  
    default: //judge the key and send message Iq)(UfaSve  
     break; ctp?y  
   } {/-y>sm  
   for(int index=0;index<MAX_KEY;index++) mbF(tSy  
   { rei 8LW  
    if(hCallWnd[index]==NULL) n4^~gT%b5]  
     continue; L<bYRGz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4F}Pu<;  
    { (V$Zc0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); tS?a){^:c  
     bProcessed=TRUE; t";{1.  
    } 2ubmsbt$  
   } bAdiA2VF'  
  } j3 6,w[Y:  
  if(!bProcessed){  ci`zR9Ks  
   for(int index=0;index<MAX_KEY;index++){ ~ct2`M$TL(  
    if(hCallWnd[index]==NULL) py]KTRzy  
     continue; lwVk(l Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W0Ktw6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9Hu d|n  
   } ]53O}sH>  
  } tC^ 1}  
 } ypH8QfxLTr  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3I|O^   
} \,2gTi,=  
w"{bp  
BOOL InitHotkey() & B}Lo  
{ >L^xlm%7o  
 if(hHook!=NULL){ | z:Q(d06  
  nHookCount++; @!e~G'j%VD  
  return TRUE; O]t\B *%}  
 } %Ys$@dB  
 else C`)_i3 ^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); b 8>q;  
  if(hHook!=NULL) gc##V]OD  
   nHookCount++; Hk@r5<{  
  return (hHook!=NULL); XlVc\?  
} >W r$Y{  
BOOL UnInit() 7!p LK&_  
{ @@Q6TB  
 if(nHookCount>1){ [q1Unm  
  nHookCount--; j?xk&  
  return TRUE; D z@1rc<B  
 } \SOeTn+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .l \r9I(  
 if(unhooked==TRUE){ $ADPV,*gG  
  nHookCount=0; {=3B)+N  
  hHook=NULL; (%bE~Q2P*<  
 } w#&z]O9r  
 return unhooked; Axlm<3<wf"  
} IK'F{QPH  
b vRB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) cJ. 7Mt  
{ lkb2?2\+  
 BOOL bAdded=FALSE; _%{0?|=  
 for(int index=0;index<MAX_KEY;index++){ %%&e"&7HE  
  if(hCallWnd[index]==0){ z$|;-u|  
   hCallWnd[index]=hWnd; {SJsA)9:#  
   HotKey[index]=cKey; )B;M  
   HotKeyMask[index]=cMask; +oZH?N4yaM  
   bAdded=TRUE; b0 &  
   KeyCount++; +Qs!Nhsq  
   break; C`NmZwL  
  } =p q:m  
 } DVh)w}v  
 return bAdded; <4c%Q)  
} hk_g2g  
oSY7IIf%L  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -(9O6)Rs$  
{ X'x3esw w  
 BOOL bRemoved=FALSE;  D,Lp|V  
 for(int index=0;index<MAX_KEY;index++){ n?:2.S.8  
  if(hCallWnd[index]==hWnd){ ]v\^&7pW  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;'}'5nO=$  
    hCallWnd[index]=NULL; &cc9}V)M  
    HotKey[index]=0; mw4JQ\  
    HotKeyMask[index]=0; -w]/7cH  
    bRemoved=TRUE; P$ucL~r  
    KeyCount--; oxfF`L"  
    break;  <B )   
   } :3^dF}>  
  } p x#suy  
 } #Ao !>qCE  
 return bRemoved; 1[-vD=  
} 9 Kbw GmSU  
Lc]1$  
void VerifyWindow() 2JZdw  
{ fQU{SjG  
 for(int i=0;i<MAX_KEY;i++){ BSgTde|3y  
  if(hCallWnd!=NULL){ XQ?fJWLU  
   if(!IsWindow(hCallWnd)){ \GL*0NJ  
    hCallWnd=NULL; b+{r! D}~  
    HotKey=0; \}#@9=  
    HotKeyMask=0; Z5B/|{  
    KeyCount--; MDHb'<o?y  
   } Y5Z!og  
  } #!})3_Qc(y  
 } ^=+e?F`:{  
} YJ,*(A18  
(.?ZKL  
BOOL CHookApp::InitInstance() ^m%52Tm h  
{ w"8V0z  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~}Z'0W)Q`z  
 hins=AfxGetInstanceHandle(); %(<(Y  
 InitHotkey(); aGK@)&h$  
 return CWinApp::InitInstance(); \uM? S  
} fu R2S70d  
I]R9HGJNlJ  
int CHookApp::ExitInstance() 6G of. :"f  
{ ".P){Dep$4  
 VerifyWindow(); 9I .^LZ"  
 UnInit(); yMxTfR  
 return CWinApp::ExitInstance(); fF;h V  
} f%XJ;y\,9H  
%>zjGF<  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ('hT  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6kR\xP]Kr  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 89H sPB1"t  
#if _MSC_VER > 1000 #jA)>z\Q^  
#pragma once 1e}8LH7  
#endif // _MSC_VER > 1000 #U ASH&  
pRi<cO  
class CCaptureDlg : public CDialog C6jR=@42Q  
{ zN!j%T.e  
 // Construction BStk&b  
 public: kOjf #@c  
  BOOL bTray; Lm6**v  
  BOOL bRegistered; u =J&~  
  BOOL RegisterHotkey(); ~L{l+jK$p  
  UCHAR cKey; VkZ.6kV  
  UCHAR cMask; =Op+v"  
  void DeleteIcon(); (D7$$!}  
  void AddIcon(); I ~$1Lu`~  
  UINT nCount; VhEka#  
  void SaveBmp(); lH2wG2  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor x({C(Q'O  
  // Dialog Data  tR)H~l7q  
  //{{AFX_DATA(CCaptureDlg) )D/ 6%]O  
  enum { IDD = IDD_CAPTURE_DIALOG }; +Xy*?5E;C  
  CComboBox m_Key; 2SG$LIV 9Y  
  BOOL m_bControl; J7+w4q~cB`  
  BOOL m_bAlt; BKIjNV3  
  BOOL m_bShift; Riry_   
  CString m_Path; O!&,5Dy  
  CString m_Number; F9flSeN  
  //}}AFX_DATA wtH~-xSB|  
  // ClassWizard generated virtual function overrides XP3x Jm3  
  //{{AFX_VIRTUAL(CCaptureDlg) p|[B =.c{  
 public: W Zn.;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <1"+,}'x  
 protected: )L5i&UK.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [[+ pMI  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); +TJ EG?o  
  //}}AFX_VIRTUAL GP a`e  
  // Implementation PaWr[ye  
 protected: $`J_:H%  
  HICON m_hIcon; #07!-)Gv  
  // Generated message map functions xDLG=A%]z  
  //{{AFX_MSG(CCaptureDlg) /+|#^:@  
  virtual BOOL OnInitDialog(); =L]Q2V}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !{%&=tIZ  
  afx_msg void OnPaint(); !3 qVB  
  afx_msg HCURSOR OnQueryDragIcon(); =#xK=pRy;  
  virtual void OnCancel(); e0HfP v_  
  afx_msg void OnAbout(); F0lOlS   
  afx_msg void OnBrowse(); F]+~x/!  
  afx_msg void OnChange(); j/!H$0PN  
 //}}AFX_MSG q(IQa@$SR  
 DECLARE_MESSAGE_MAP() H/fUM  
}; _NZ@4+aW  
#endif }q[Bd  
v]VWDT `  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 1iBP,:>*  
#include "stdafx.h" jZ*WN|FK?  
#include "Capture.h" s!B/WsK  
#include "CaptureDlg.h" ~AB*]Us  
#include <windowsx.h> \jU |(DE  
#pragma comment(lib,"hook.lib") W!L+(!&H  
#ifdef _DEBUG I]`-|Q E  
#define new DEBUG_NEW gVR@&bi7  
#undef THIS_FILE v|';!p|  
static char THIS_FILE[] = __FILE__; ^Q}eatEn  
#endif #UP~iHbt\  
#define IDM_SHELL WM_USER+1 Ond'R'3\E  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); WT\<.Py  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 23]Y<->Eu<  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; OF U/gaO~  
class CAboutDlg : public CDialog {KL5GowH  
{ ,  X{>  
 public: Zu*K-ep"  
  CAboutDlg(); sW@krBxMv  
  // Dialog Data 6<76H  
  //{{AFX_DATA(CAboutDlg) 9i q""  
  enum { IDD = IDD_ABOUTBOX }; @.C{OSH E  
  //}}AFX_DATA mN_Z7n;^eh  
  // ClassWizard generated virtual function overrides c3TKl/  
  //{{AFX_VIRTUAL(CAboutDlg) #FxPj-3(ix  
 protected: 4Y\wnwI  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <n"C,  
  //}}AFX_VIRTUAL kFLB> j97  
  // Implementation 5\fCd|  
 protected: zg)sd1@  
  //{{AFX_MSG(CAboutDlg) x2Lq=zwJ  
  //}}AFX_MSG &HZmQ>!R D  
  DECLARE_MESSAGE_MAP() RO(TvZ0pE  
}; D<$XyP  
/iaf ^ >  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) C~% 1w%nn  
{ ~a9W3b4j  
 //{{AFX_DATA_INIT(CAboutDlg) T1WWK'  
 //}}AFX_DATA_INIT *iA4:EIP  
} ]e?x# <S  
-V.d?A4"  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !D^c3d  
{ `{v?6:G:Q  
 CDialog::DoDataExchange(pDX); BqK(DH^9N  
 //{{AFX_DATA_MAP(CAboutDlg) !~i' -4]  
 //}}AFX_DATA_MAP Z~  
} 4'1m4Ugg  
/b#l^x:j  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Ta=s:trP  
 //{{AFX_MSG_MAP(CAboutDlg) @@G6p($  
 // No message handlers bpAv1udX-W  
 //}}AFX_MSG_MAP nAJdr*`a,5  
END_MESSAGE_MAP() V N{NA+I  
h&&6r\4/|  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *jq7X  
: CDialog(CCaptureDlg::IDD, pParent) "_UdBG  
{ }n:?7  
 //{{AFX_DATA_INIT(CCaptureDlg) >R,'5:Rw  
  m_bControl = FALSE; NE2pL@ sk  
  m_bAlt = FALSE; -_OS%ARa  
  m_bShift = FALSE; & WOiik  
  m_Path = _T("c:\\"); Elj_,z  
  m_Number = _T("0 picture captured."); {y=W6uP  
  nCount=0; >4` dy  
  bRegistered=FALSE; w'4AJ Q|;  
  bTray=FALSE; :nN1e  
 //}}AFX_DATA_INIT W*DVi_\$y  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 =<@2#E)  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ! |waK~jK  
} ?4H#G)F  
Z6C=T;w  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @oP_;G  
{ #65^w=Sp}  
 CDialog::DoDataExchange(pDX); ? 8aaD>OR$  
 //{{AFX_DATA_MAP(CCaptureDlg) /wShUR{  
  DDX_Control(pDX, IDC_KEY, m_Key); eYUr-rN+)z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); uE/T2BX*  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .0 )Y  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Yj|eji7y  
  DDX_Text(pDX, IDC_PATH, m_Path); Vgb *% I  
  DDX_Text(pDX, IDC_NUMBER, m_Number); k,F"-K+M  
 //}}AFX_DATA_MAP `A$!]&[~|  
} 6DTTV66  
%q ;jVj[  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) g:l.MJT  
//{{AFX_MSG_MAP(CCaptureDlg) [&[^G25  
 ON_WM_SYSCOMMAND() hY5WJ;  
 ON_WM_PAINT() $3T_ .  
 ON_WM_QUERYDRAGICON() ,fDEz9-,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `^JJ&)4iv  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) n"PJ,ao  
 ON_BN_CLICKED(ID_CHANGE, OnChange) }T^cEfX  
//}}AFX_MSG_MAP =;a!u  
END_MESSAGE_MAP() Di_2Plo)4  
5wao1sd#  
BOOL CCaptureDlg::OnInitDialog() )4U> !KrY  
{ w.\w1:d  
 CDialog::OnInitDialog(); [S]S^ej*8  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tY${M^^<J  
 ASSERT(IDM_ABOUTBOX < 0xF000); vr^~yEr  
 CMenu* pSysMenu = GetSystemMenu(FALSE); qLL,F  
 if (pSysMenu != NULL) XKA&XpF  
 { 5vAf7\*  
  CString strAboutMenu; @oF$LMD  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ]r! >{  
  if (!strAboutMenu.IsEmpty()) i@5[FC  
  { HW4 .zw  
   pSysMenu->AppendMenu(MF_SEPARATOR); >Iewx Gb>  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,Y?sfp  
  } % }|cb7l  
 } yH 9!GS#  
 SetIcon(m_hIcon, TRUE); // Set big icon |s#'dS;  
 SetIcon(m_hIcon, FALSE); // Set small icon `i) 2nNJ"  
 m_Key.SetCurSel(0); `(+o=HsD  
 RegisterHotkey(); iB0WEj[?  
 CMenu* pMenu=GetSystemMenu(FALSE); ,r^M?>  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $mmup|;(  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \I-#1M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); TC~Q G$NW  
 return TRUE; // return TRUE unless you set the focus to a control ne61}F"E  
} -! ;l~#K=  
G&xo1K]  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) hv6@Jr3  
{ _Y=2/*y^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) <^~FLjsfg  
 { _I`,Br:N  
  CAboutDlg dlgAbout; h eaRX4  
  dlgAbout.DoModal(); U-k+9f 0  
 } UX3BeUi.)  
 else ;@,Q&B2eM  
 { 07Gv*.  
  CDialog::OnSysCommand(nID, lParam); w;}@'GgL  
 } `~eX55W  
} b `2|I {  
;4M><OS!  
void CCaptureDlg::OnPaint() a07@C  
{ tkQH\5  
 if (IsIconic()) =~Ynz7 /x  
 { )#a[-.OI  
  CPaintDC dc(this); // device context for painting JXG"M#{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &zQ2M#{82  
  // Center icon in client rectangle <Llp\XcZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); n,eJ$2!J  
  int cyIcon = GetSystemMetrics(SM_CYICON); YSJy`  
  CRect rect; F/m^?{==~*  
  GetClientRect(&rect); -LDCBc"  
  int x = (rect.Width() - cxIcon + 1) / 2; *#%9Rp2|  
  int y = (rect.Height() - cyIcon + 1) / 2; PkE5|d*,  
  // Draw the icon SvN9aD1  
  dc.DrawIcon(x, y, m_hIcon); {U 'd}Q  
 } 4Wy <?O2  
 else A7! g  
 { 72sD0)?A  
  CDialog::OnPaint(); 6C>_a*w  
 } }pk#!N  
} yc2/~a_ Gx  
RT93Mt%P  
HCURSOR CCaptureDlg::OnQueryDragIcon() < v]3g  
{ <R%;~){  
 return (HCURSOR) m_hIcon; 6Ao%>;e*  
} LA_3=@2.H  
n .!Ym X4  
void CCaptureDlg::OnCancel() >@WX>0`ht  
{ X1IeSMAe  
 if(bTray) Eh-n  
  DeleteIcon(); gH2,\z`[4  
  CDialog::OnCancel(); B63pgPX  
} YY?a>j."a  
/&u<TJ4  
void CCaptureDlg::OnAbout() N=:5eAza  
{ 0JgL2ayIVI  
 CAboutDlg dlg; nd;fy$<J\  
 dlg.DoModal(); ) \Y7&  
} i>EgG5iJ  
7NC=*A~  
void CCaptureDlg::OnBrowse() < B_Vc:Q  
{ K =.%$A  
 CString str; w;Q;[:y  
 BROWSEINFO bi; \BWyk A>  
 char name[MAX_PATH]; j1SMeDDM ~  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); k5kdCC0FCk  
 bi.hwndOwner=GetSafeHwnd(); -(`OcGM'L  
 bi.pszDisplayName=name; L=2y57&Y  
 bi.lpszTitle="Select folder"; QDpEb=|S  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; o7B[R) 4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); t9&c E:n  
 if(idl==NULL) 8 #ndFpu  
  return; LPG`^SA  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); %{3 aW>yx  
 str.ReleaseBuffer(); mh<=[J,%p  
 m_Path=str; ZKg{0DY  
 if(str.GetAt(str.GetLength()-1)!='\\') Ca%g_B0t  
  m_Path+="\\"; }SIGPVM  
 UpdateData(FALSE); }M1sksk5  
} 0y<wvLv2C  
:K\mN/ x  
void CCaptureDlg::SaveBmp() O62b+%~F  
{ pV6d Id  
 CDC dc; K1V#cB WO  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); {;2vmx9  
 CBitmap bm; vP7K9K x  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3nY1[,  
 int Height=GetSystemMetrics(SM_CYSCREEN); tbnH,*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ~gz^Cdh  
 CDC tdc; fN"( mW>!  
 tdc.CreateCompatibleDC(&dc); ;q0uE:^ S  
 CBitmap*pOld=tdc.SelectObject(&bm); {lth+{&L#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `mye}L2I  
 tdc.SelectObject(pOld); Z):n c% S  
 BITMAP btm; R3k1RE2c&g  
 bm.GetBitmap(&btm); kNu'AT#3|  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; `h}q Eo`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9N%JP+<89  
 BITMAPINFOHEADER bih; H _Va"yTO6  
 bih.biBitCount=btm.bmBitsPixel; nhG J  
 bih.biClrImportant=0; "O8gJ0e  
 bih.biClrUsed=0; IV lf=k  
 bih.biCompression=0; Hi_ G  
 bih.biHeight=btm.bmHeight; bCZ g cN  
 bih.biPlanes=1; $A3<G-4O  
 bih.biSize=sizeof(BITMAPINFOHEADER); i{D=l7j|w  
 bih.biSizeImage=size; +GsWTEz   
 bih.biWidth=btm.bmWidth; jGrN\D?h  
 bih.biXPelsPerMeter=0; RzhWD^bB  
 bih.biYPelsPerMeter=0; v(OBXa9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \c[IbL07  
 static int filecount=0; Mg#j3W}]  
 CString name; 2MA]jT  
 name.Format("pict%04d.bmp",filecount++); U/lM\3v/e  
 name=m_Path+name; nA?Hxos  
 BITMAPFILEHEADER bfh; zrVC8Wb  
 bfh.bfReserved1=bfh.bfReserved2=0; 6h3HDFS7s  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 6Es? MW=  
 bfh.bfSize=54+size; T32BnmB{  
 bfh.bfOffBits=54; y8VpFa  
 CFile bf; Q-#$Aa  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ l{w#H|]  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); d--y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); jlFk@:y4  
  bf.WriteHuge(lpData,size); VF&Z%O3n  
  bf.Close(); ]pEV}@7  
  nCount++; ^\B :R,  
 } Kb =@ =Xta  
 GlobalFreePtr(lpData); RtG}h[k/X  
 if(nCount==1) "U. ^lkN  
  m_Number.Format("%d picture captured.",nCount); {brMqE>P#  
 else &'l>rD^o  
  m_Number.Format("%d pictures captured.",nCount); -T6(hT\  
  UpdateData(FALSE); CIjZG?A  
} 'WHHc 9rG,  
`>DP,D)w(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) g+-;J+X8  
{ oJKa"H-jL  
 if(pMsg -> message == WM_KEYDOWN) "m{,~'x  
 { 7VK}Dy/Vvn  
  if(pMsg -> wParam == VK_ESCAPE) .oEmU+  
   return TRUE; X0{/ydG F8  
  if(pMsg -> wParam == VK_RETURN) k`".  
   return TRUE; PX|=(:(k  
 } E{HY!L[  
 return CDialog::PreTranslateMessage(pMsg); EkT."K  
} 5unG#szq  
g~UUP4<$"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4h6k`ie!$  
{ 5 ,0d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +l^LlqA  
  SaveBmp(); 5-)#f?  
  return FALSE; >hY" 3  
} }AZc8o-  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 9;F bnp'  
 CMenu pop; 7^} Ll@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /S:F)MO9  
 CMenu*pMenu=pop.GetSubMenu(0); yBLK$@9  
 pMenu->SetDefaultItem(ID_EXITICON); 7=@jARW&  
 CPoint pt; k7tYa;C  
 GetCursorPos(&pt); .^) UO  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2!N8rHRt  
 if(id==ID_EXITICON) J==SZ v  
  DeleteIcon(); UR(-q  
 else if(id==ID_EXIT) W~_t~Vg5  
  OnCancel(); 5q@LxDy,b  
 return FALSE; "i:T+#i({O  
} %hlspI(J  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); P#v*TD'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) SPj><5Ro  
 AddIcon(); \U%#nU{  
 return res; %iJ%{{f`  
} (2?G:+C 7  
W:i?t8y\y  
void CCaptureDlg::AddIcon() &iN--~}!$  
{ xr0haN\p"  
 NOTIFYICONDATA data; $o@R^sJ  
 data.cbSize=sizeof(NOTIFYICONDATA); +Taa!hfys  
 CString tip; R E1 /"[t  
 tip.LoadString(IDS_ICONTIP); 9iN.3/T8  
 data.hIcon=GetIcon(0); HG/p$L*  
 data.hWnd=GetSafeHwnd(); \3Oij^l 0  
 strcpy(data.szTip,tip); @|ye qy_:  
 data.uCallbackMessage=IDM_SHELL; 2?Ye*-  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ry};m_BY  
 data.uID=98; ^ 4%Zvl  
 Shell_NotifyIcon(NIM_ADD,&data); ? _\$  
 ShowWindow(SW_HIDE); 3E}EBJLsZ  
 bTray=TRUE; Dj\e@?Y  
} DjMf,wX-{  
(Lh#`L?x  
void CCaptureDlg::DeleteIcon() s!/TU{8J  
{ I[o*RKT'"  
 NOTIFYICONDATA data; y( r1I[W'  
 data.cbSize=sizeof(NOTIFYICONDATA); r%Rs0)$yj  
 data.hWnd=GetSafeHwnd(); 6VD1cb\lF  
 data.uID=98; ryO$6L  
 Shell_NotifyIcon(NIM_DELETE,&data); S)He$B$pp  
 ShowWindow(SW_SHOW); n$m"]inX  
 SetForegroundWindow(); ~Lfcg*  
 ShowWindow(SW_SHOWNORMAL); P[t$\FS  
 bTray=FALSE; Kex[ >L10G  
} nW\(IkX\  
;%J5=f%z)  
void CCaptureDlg::OnChange() 89o)M5KQ  
{ 'NZGQeb K  
 RegisterHotkey(); %Qn(rA@9  
} "a1O01n  
7#;vG>]  
BOOL CCaptureDlg::RegisterHotkey() X fz`^x>M  
{ E04l|   
 UpdateData(); ^=cXo<6D  
 UCHAR mask=0; mN0=i(H<  
 UCHAR key=0; b M;`s5d  
 if(m_bControl) %;`>`j5  
  mask|=4; p]W+eT  
 if(m_bAlt) $ &5w\P  
  mask|=2; g1DmV,W-Q  
 if(m_bShift) T+"f]v  
  mask|=1; 8F;>5i  
  key=Key_Table[m_Key.GetCurSel()]; zIQzmvf  
 if(bRegistered){ _BnTv$.P  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); E]^5I3=O  
  bRegistered=FALSE; /I&wj^   
 } B%<e FFV\  
 cMask=mask; "oJ(J{Jat  
 cKey=key; eR']#Q46{T  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); B\j~)vg  
 return bRegistered; "YFls#4H-  
} h?@G$%2  
)tZ`K |  
  四、小结 3bC yTZk  
}{7e7tW6  
  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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