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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: tvT8UW'  
  kQVDC,d  
  一、实现方法 &_d/ciq1f  
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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: $-Pqs ^g  
>}b6J7_  
#pragma data_seg("shareddata") IzdTXc f  
HHOOK hHook =NULL; //钩子句柄 ,|X+/|gm  
UINT nHookCount =0; //挂接的程序数目 3g [j%`k  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 mO)PJd2ZD  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 t*d >eK`:N  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey K\+}q{  
static int KeyCount =0; .^lb LN^2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 HI\f>U  
#pragma data_seg() *fi;ZUPW3  
sD8 m<   
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 NOr <,  
}{xN`pZ  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: <;cE/W}}  
R pI<]1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ncattp   
cKey,UCHAR cMask) /%YiZ#  
{ zLQ#GF  
 BOOL bAdded=FALSE; RO{@RhnV  
 for(int index=0;index<MAX_KEY;index++){ j- YJ."  
  if(hCallWnd[index]==0){ a4( ?]ND~6  
   hCallWnd[index]=hWnd; ]}[Yf  
   HotKey[index]=cKey; q|o |/O-{  
   HotKeyMask[index]=cMask; Y/,$Y]%g  
   bAdded=TRUE; wD ],{y  
   KeyCount++; nS+FX& _  
   break; y168K[p  
  } :X1cA3c!  
 } t {SMSp  
 return bAdded;  (X(1kj3  
} T5S g2a1&  
//删除热键 dHG  Io  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8b:clvh  
{ 6 W;?8Z_1  
 BOOL bRemoved=FALSE; bugFl>  
 for(int index=0;index<MAX_KEY;index++){ %,,`N I{  
  if(hCallWnd[index]==hWnd){ ;wXY3|@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p x|>v8  
    hCallWnd[index]=NULL; 1Vf78n  
    HotKey[index]=0; +K;Y+ K&;2  
    HotKeyMask[index]=0; X#DL/#z k  
    bRemoved=TRUE; N pXgyD  
    KeyCount--; }B"|z'u  
    break; _t|G@D{   
   } :,NFFN  
  } e" Eqi-  
 } z0 2}&^Zzk  
 return bRemoved; x(9; !4O>  
} TTZ['HP oI  
1a&/Zlr  
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  DLL中的钩子函数如下: M_h8#7{G  
hB?,7-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) VJN/#   
{ x^)g'16`  
 BOOL bProcessed=FALSE; ^p 2.UW  
 if(HC_ACTION==nCode) `u#;MUg  
 { 9$o<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ]D LZ&5pv  
   switch(wParam) U['JFLF  
   {  T2DF'f3A  
    case VK_MENU: > 'aG /(  
     MaskBits&=~ALTBIT; d $fvg8^  
     break; "($Lx  
    case VK_CONTROL: 9jO`gWxV8*  
     MaskBits&=~CTRLBIT; 6[*;M  
     break; SqXy;S@  
    case VK_SHIFT: %'L].+$t  
     MaskBits&=~SHIFTBIT; |Bx||=z`  
     break; eQU-&-wt0  
    default: //judge the key and send message .!yWF?T8  
     break; 1mHwYT+  
   } ]6{(Hjt  
   for(int index=0;index<MAX_KEY;index++){ qGnPnQc  
    if(hCallWnd[index]==NULL) By?nd)  
     continue; -RG8<bI,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P>*Fj4 Z~  
    { -ca7x`yo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); . [T'yc:=  
     bProcessed=TRUE; %n05 Jitl  
    } @up&q  
   } }_{y|NW  
  } 5/B#)gm  
  else if((lParam&0xc000ffff)==1){ //有键按下 D:wnO|:  
   switch(wParam) +`;+RDKY*  
   { 0A#*4ap  
    case VK_MENU: >vWEUE[  
     MaskBits|=ALTBIT; U~uwm/h  
     break; i`[#W(m  
    case VK_CONTROL: 5vD3K! \u  
     MaskBits|=CTRLBIT; v:r D3=M-  
     break; 6exI_3A4jh  
    case VK_SHIFT: YBX)eWslK  
     MaskBits|=SHIFTBIT; +I|Rk&  
     break; dqqnCXYuW  
    default: //judge the key and send message C=N! z  
     break; ^Xs%.`Gv/  
   } "^;#f+0  
   for(int index=0;index<MAX_KEY;index++){ H LjvKE=W  
    if(hCallWnd[index]==NULL) -xJX_6}A  
     continue; iv:,fkwG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {(rf/:X!p  
    { JY{X,?s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); tg~A}1o`0  
     bProcessed=TRUE; (y1$MYZ Q  
    } C,o:  
   } 5;W\2yj  
  } 7MY)\aH  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 {7vgHutp  
   for(int index=0;index<MAX_KEY;index++){ P}HC(S1  
    if(hCallWnd[index]==NULL) Y!SE;N&  
     continue; \V]t!mZ-}l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Y [W6Sc  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \UQ9MX _  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 >n]oB~P%  
   } A-Mj|V  
  } -i#J[>=w{C  
 } @-0Fe9 n=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9Ei5z6Vk/+  
} N99[.mErU  
oP/>ju  
  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: :<L5sp  
/@VsqD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6\NvG,8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -*?p F_*w  
swt tp`  
  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: ]k[x9,IU\y  
H#OYw#L"u  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %/51o6a  
{ F8;mYuA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) +A@m9  
 { <mL%P`Jj  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 {$;2 HbM(  
  SaveBmp(); @B?FE\  
  return FALSE; 5J  ySFG3  
 } j(j#0dXLh  
 …… //其它处理及默认处理 [w!C*_V 9  
} # Mu<8`T-  
^w.]Hd 2  
4Rx~s7l  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 TN5>"? ?"  
oz LH]*  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 +jUgx;u,  
]DO&x+Rb  
  二、编程步骤 lr,q{;  
Z:!IX^q;}n  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; C,fY.CeI  
Pb#P`L7OB  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; vm8$:W2 }  
!v0"$V5+i  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; `xCOR  
/jM_mrpz  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; !NTH.U:g  
2HD:JdL  
  5、 添加代码,编译运行程序。 q]CeD   
XIKvH-0&  
三、程序代码 5$kdgFq(  
\^jjK,OK  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL C0QM#"[  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) k)cP! %z  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Q^L) Vp"  
#if _MSC_VER > 1000 3f"C!l]Xu  
#pragma once O5zE {#  
#endif // _MSC_VER > 1000 H(b)aw^(%  
#ifndef __AFXWIN_H__ {?Od{d9  
#error include 'stdafx.h' before including this file for PCH b]T@gJ4H=  
#endif YScvyh?E  
#include "resource.h" // main symbols eeM?]J-  
class CHookApp : public CWinApp 8] `Ru5nd  
{ \Wr,<Y  
 public: }9^@5!qX  
  CHookApp(); wjrG7*_Y4v  
  // Overrides M%I@<~wl  
  // ClassWizard generated virtual function overrides Xw t`(h[u  
  //{{AFX_VIRTUAL(CHookApp) yI&9\fn  
 public: >{wuEPA  
  virtual BOOL InitInstance(); z8E1m"  
  virtual int ExitInstance(); ];1R&:t  
  //}}AFX_VIRTUAL &kzj?xK=(j  
  //{{AFX_MSG(CHookApp) @ &pqt6/t  
  // NOTE - the ClassWizard will add and remove member functions here. -\4zwIH  
  // DO NOT EDIT what you see in these blocks of generated code ! Br!9x {q*  
  //}}AFX_MSG #Y2i*:<  
  DECLARE_MESSAGE_MAP()  S(  
}; Or8kp/d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); E$A3|rjnoN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~Wei|,w'<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lj4o#^lC  
BOOL InitHotkey(); .1#kD M  
BOOL UnInit(); l(!/Q|Q|  
#endif E"6X|I n  
:Wc_Utt  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. wksl0:BL  
#include "stdafx.h" :QPf~\w?  
#include "hook.h" 19W:-Om  
#include <windowsx.h>  lq>AGw  
#ifdef _DEBUG H;Ku w  
#define new DEBUG_NEW t0Mx!p'T  
#undef THIS_FILE ^AL2H'  
static char THIS_FILE[] = __FILE__; X:|8vS+0gU  
#endif }gv8au<  
#define MAX_KEY 100 j/KO|iNL2  
#define CTRLBIT 0x04 po7>IQS]  
#define ALTBIT 0x02 * ?]~ #  
#define SHIFTBIT 0x01 PX2c[CDE^  
#pragma data_seg("shareddata") iX"C/L|JN  
HHOOK hHook =NULL; s2REt$.q  
UINT nHookCount =0; 6KRO{QK  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Yf}xwpuLk  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT *z8|P#@  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey pDl3!m  
static int KeyCount =0; D=+NxR[  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ,eRQu.  
#pragma data_seg() TB!(('  
HINSTANCE hins; T^:fn-S}=  
void VerifyWindow(); QI_4*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ) #+^ sAO  
//{{AFX_MSG_MAP(CHookApp) l63hLz  
// NOTE - the ClassWizard will add and remove mapping macros here. R#W&ery  
// DO NOT EDIT what you see in these blocks of generated code! ~b)74M/  
//}}AFX_MSG_MAP Zsx3/}  
END_MESSAGE_MAP() $n!K6fkX%  
= a}b+(R  
CHookApp::CHookApp() G8J*Wnwu[K  
{ [0y$! f4  
 // TODO: add construction code here, {<=#*qx[Y!  
 // Place all significant initialization in InitInstance />44]A<  
} ,|h)bg7.  
"@/62b  
CHookApp theApp; F(,UA+$A  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Iz@)!3h  
{ Fmr}o(q1  
 BOOL bProcessed=FALSE; yN6>VD{F  
 if(HC_ACTION==nCode)  Vzl^Ka'  
 { VIJ<``9[  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8gy_Yj&{P  
   switch(wParam) gckI.[!b  
   { @~ETj26U'  
    case VK_MENU: y[?-@7i  
     MaskBits&=~ALTBIT; qfoD  
     break; {d<;BLA  
    case VK_CONTROL: yuhnYR\`m  
     MaskBits&=~CTRLBIT; ~*W!mlg  
     break; SF*n1V3hx  
    case VK_SHIFT: eq4C+&O&  
     MaskBits&=~SHIFTBIT; Wwujh2g"0|  
     break; >znRyQ~bM  
    default: //judge the key and send message $O)3 q $|  
     break; ?OlV"zK  
   } ]#2Y e7+  
   for(int index=0;index<MAX_KEY;index++){ alq%H}FF  
    if(hCallWnd[index]==NULL) VQ#3#Hj  
     continue; tmUFT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kwpK1R4zs  
    { OEx^3z^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hC <O`|lF  
     bProcessed=TRUE; cLVeT  
    } :'iYxhM.V  
   } OTDg5:>  
  } H1n1-!%d  
  else if((lParam&0xc000ffff)==1){ //Key down W ~f(::  
   switch(wParam) JM- t<.  
   { \>QF(J [8  
    case VK_MENU: GL{57  
     MaskBits|=ALTBIT; /3B $(  
     break; uocHa5J  
    case VK_CONTROL: }a AH  
     MaskBits|=CTRLBIT; UMl#D >:C<  
     break; NKb1LbnZ*y  
    case VK_SHIFT: $37 g]ZD  
     MaskBits|=SHIFTBIT; xg_D f,  
     break; 6 GP p>X  
    default: //judge the key and send message  Q6'x\  
     break; <Z}SKR"U%  
   } 6(d}W2GP  
   for(int index=0;index<MAX_KEY;index++) ' Z0r>.  
   { jw<pK4?y  
    if(hCallWnd[index]==NULL) =L;] ;i  
     continue; I`KQ|h0%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _BdE< !r  
    { kHw_ S-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); r$Co0!.  
     bProcessed=TRUE; +5VLw  
    } QTX8 L  
   } ^sN (  
  } U8qtwA9t  
  if(!bProcessed){ ^V$Ajt  
   for(int index=0;index<MAX_KEY;index++){ D%6;^^WyUx  
    if(hCallWnd[index]==NULL) om?-WJI  
     continue; |sRipWh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Mi'8 ~J  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 26T"XW'_  
   } 8#!i[UF dj  
  } 5%sE] Y#  
 } 2MZCw^s>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Vq;dJ%sY  
} 4vBL6!z:Z  
~ .;<  Bj  
BOOL InitHotkey() ;JZS^Wa  
{ y E[#ze  
 if(hHook!=NULL){ J+d1&Tw&  
  nHookCount++; ok|qyN+  
  return TRUE; V,rq0xW  
 } 3gd&i  
 else oy<WsbnS  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 8JmFi  
  if(hHook!=NULL) rV08ad  
   nHookCount++; M%jPH  
  return (hHook!=NULL); }!IL]0 q  
} ]Oq[gBL"A  
BOOL UnInit() .9Y)AtJTS  
{ ~3uP6\F  
 if(nHookCount>1){ V<k8N^  
  nHookCount--; C8z{XSo  
  return TRUE; da)NK!  
 } -B86U6^s  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ^%O]P`$  
 if(unhooked==TRUE){ V5*OA??k<  
  nHookCount=0; \=_{na_  
  hHook=NULL; Y ')x/H  
 } 0}_[DAd6  
 return unhooked; giz7{Ai  
} qucq,Yw  
x c{hC4^V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x?&$ci  
{ ,}K<*t[I  
 BOOL bAdded=FALSE; [jmd  
 for(int index=0;index<MAX_KEY;index++){ !.d@L6  
  if(hCallWnd[index]==0){ 9k{PBAP  
   hCallWnd[index]=hWnd; :9k Ty:  
   HotKey[index]=cKey; fW?o@vlO  
   HotKeyMask[index]=cMask; N<~ku<nAU  
   bAdded=TRUE; uu`G 2[t  
   KeyCount++; S~|T4q(  
   break; @')[FEdW  
  } 9-MUX^?u  
 } 7hsGua  
 return bAdded; 5LOo8xN  
} ,c NLkoN  
KZ/=IP=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ght$9>'n  
{ T?X_c"{8M  
 BOOL bRemoved=FALSE; <>Hj ;q5p  
 for(int index=0;index<MAX_KEY;index++){ (DI>5.x"  
  if(hCallWnd[index]==hWnd){ 6'FdGS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ qT+%;(  
    hCallWnd[index]=NULL; vh$%9ed  
    HotKey[index]=0; %f]:I  
    HotKeyMask[index]=0; <_7*67{  
    bRemoved=TRUE; P'_H/r/#  
    KeyCount--; rW=Z>1  
    break; AJ=qna  
   } ?"g!  
  } @ta7"6p-i@  
 } !jTcsN%  
 return bRemoved; Y=Kc'x[,Zj  
} "men  
&G-!qxe  
void VerifyWindow() .X;3,D[w  
{ /{&tY: ;m  
 for(int i=0;i<MAX_KEY;i++){ MjU6/pO}L  
  if(hCallWnd!=NULL){ _ jsK}- \  
   if(!IsWindow(hCallWnd)){ .hifsB~  
    hCallWnd=NULL; Om5Y|v"*  
    HotKey=0; c I4K+  
    HotKeyMask=0; w 47tgPPk  
    KeyCount--; n^g|Ja  
   } (=om,g}  
  } _WRFsDZ'  
 } B\XKw'   
} xU4 +|d  
z*!%g[3I  
BOOL CHookApp::InitInstance() X<I+&Zi  
{ /#)/;  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); xsD($_  
 hins=AfxGetInstanceHandle(); j-lfMEa$o  
 InitHotkey(); s6@DGSJ  
 return CWinApp::InitInstance(); ATK_DE Au  
} 6}FP  
Jt}Bpg!J  
int CHookApp::ExitInstance() 32`{7a3!=  
{  z62;cv  
 VerifyWindow(); j3{D^|0bP  
 UnInit(); yjF1}SQ  
 return CWinApp::ExitInstance(); N u<_}  
} $adbCY \  
6V7B;tB  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %yv<y+yP~  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]d! UJ&<?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ qm"rY\:  
#if _MSC_VER > 1000 ~=uWD&5B4  
#pragma once ,Vt/(x-  
#endif // _MSC_VER > 1000 1ng!G 7g  
?j"KV_  
class CCaptureDlg : public CDialog vzim<;i  
{ E2Q[ZoVS  
 // Construction !1$])VQWI  
 public: 4b98Ks Yg  
  BOOL bTray; )p<ExMIxd  
  BOOL bRegistered; ~?K~L~f5  
  BOOL RegisterHotkey(); 0.8  2kl  
  UCHAR cKey; )-a'{W/t  
  UCHAR cMask; &E.^jR~*  
  void DeleteIcon(); ewctkI$,5  
  void AddIcon(); tFp Ygff<  
  UINT nCount; s~5[![1 K  
  void SaveBmp(); x-^`~ p  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor z=q3Zo  
  // Dialog Data YS/Yd[ e  
  //{{AFX_DATA(CCaptureDlg) hoK>~:;  
  enum { IDD = IDD_CAPTURE_DIALOG }; .y!<t}  
  CComboBox m_Key; 9_Be0xgJ3^  
  BOOL m_bControl; RO 4Z?tz  
  BOOL m_bAlt; e4? >-  
  BOOL m_bShift; RBs-_o+%  
  CString m_Path; Vf] "L .G  
  CString m_Number; A#EDk U,  
  //}}AFX_DATA t/VD31  
  // ClassWizard generated virtual function overrides onz?_SAW  
  //{{AFX_VIRTUAL(CCaptureDlg) wl#@lOv-P  
 public: (|klSz_4LM  
  virtual BOOL PreTranslateMessage(MSG* pMsg); n\*!CXc  
 protected: '>-gi}z7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support m qMHL2~  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); A%KDiIA  
  //}}AFX_VIRTUAL Z2qW\E^_r  
  // Implementation /5(Yy}  
 protected: Azl&mu  
  HICON m_hIcon; TO]@ Zu1  
  // Generated message map functions ~*z% e*EL  
  //{{AFX_MSG(CCaptureDlg) RtTJ5@V(  
  virtual BOOL OnInitDialog(); ME46V6[LX]  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =P't(<  
  afx_msg void OnPaint();  zv0l,-o  
  afx_msg HCURSOR OnQueryDragIcon(); a&/#X9/  
  virtual void OnCancel(); TaKLzd2  
  afx_msg void OnAbout(); PgtJ3oq [}  
  afx_msg void OnBrowse(); 6dabU*  
  afx_msg void OnChange(); J8uLJ  
 //}}AFX_MSG 42G)~lun-d  
 DECLARE_MESSAGE_MAP() :XZU&Sr"  
}; tn(JC%?^  
#endif + B B@OW  
s4A43i'g!h  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file *>7>g"  
#include "stdafx.h" m% -g~q  
#include "Capture.h" j*so9M6|c  
#include "CaptureDlg.h"  HN=V"a  
#include <windowsx.h> Dfg2`l  
#pragma comment(lib,"hook.lib") X[]m _@v  
#ifdef _DEBUG !t$'AoVBq  
#define new DEBUG_NEW r`W)0oxD  
#undef THIS_FILE sFT.Oxg<  
static char THIS_FILE[] = __FILE__; \<JSkr[h!"  
#endif >s>1[W@*  
#define IDM_SHELL WM_USER+1 52:HNA\E/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); R!\_rc1/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v1o#1;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3er nTD*`  
class CAboutDlg : public CDialog $HHs^tW  
{ +b0eE)  
 public: ]m g)Q:d,  
  CAboutDlg(); G&D7a/G\  
  // Dialog Data +)!YrKuu  
  //{{AFX_DATA(CAboutDlg) YVQN&|-  
  enum { IDD = IDD_ABOUTBOX }; PRu 6xsyA  
  //}}AFX_DATA .7e2YI,S  
  // ClassWizard generated virtual function overrides #hfXZVD  
  //{{AFX_VIRTUAL(CAboutDlg) \KMToN&2  
 protected: tItX y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [I '0,y  
  //}}AFX_VIRTUAL nw-xSS{  
  // Implementation gw#5jW\  
 protected: dgR g>)V  
  //{{AFX_MSG(CAboutDlg) {MtpkUN  
  //}}AFX_MSG 1C}NQ!.  
  DECLARE_MESSAGE_MAP() mHV%I@`Y6  
}; CtyoHvw+M  
ciBP7>'::  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +giyX7BPJ  
{ {@6= Q 6L  
 //{{AFX_DATA_INIT(CAboutDlg) G`SUxhCk  
 //}}AFX_DATA_INIT 0h#l JS*  
} _ky,;9G]  
_ "?.!  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %<k2#6K  
{ Gw>^[dmt!  
 CDialog::DoDataExchange(pDX); FQu8 vwV6>  
 //{{AFX_DATA_MAP(CAboutDlg) d4u})  
 //}}AFX_DATA_MAP t2/#&J]  
} 6IBgt!=,  
#p P[xE"Y  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) R)_%i<nq\  
 //{{AFX_MSG_MAP(CAboutDlg) fol,xMc&  
 // No message handlers tNO-e|~'  
 //}}AFX_MSG_MAP \Jx04[=  
END_MESSAGE_MAP() KK&rb~  
"'c A2~  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) X iS1\*  
: CDialog(CCaptureDlg::IDD, pParent) G,?hp>lj  
{ h].<t&  
 //{{AFX_DATA_INIT(CCaptureDlg) "$#xK|t  
  m_bControl = FALSE; ;YA(|h<  
  m_bAlt = FALSE; |SoCRjuCPM  
  m_bShift = FALSE; >.Chl$)<  
  m_Path = _T("c:\\"); E(O74/2c8  
  m_Number = _T("0 picture captured."); oe%} ?u  
  nCount=0; L^E[J`  
  bRegistered=FALSE; Z,sv9{4r  
  bTray=FALSE; -}nxJH)  
 //}}AFX_DATA_INIT ?oVx2LdD|  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 S{]x  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); SX<` {x&L  
} Rn}l6kbM  
gp5_Z-me  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) *,e:]!*  
{ ]JCvyz H  
 CDialog::DoDataExchange(pDX); -=%@L&y1  
 //{{AFX_DATA_MAP(CCaptureDlg) QqFR\6  
  DDX_Control(pDX, IDC_KEY, m_Key); (\\eo  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); XRcqhv  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {_7 i8c<s=  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?3nR  
  DDX_Text(pDX, IDC_PATH, m_Path); CnpV:>V=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); -8; 7Sp1  
 //}}AFX_DATA_MAP bSiYHRH.e  
} #r#1JtT  
 O{QA  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) d;zai]]  
//{{AFX_MSG_MAP(CCaptureDlg) `P@T$bC  
 ON_WM_SYSCOMMAND() G/b^|;41  
 ON_WM_PAINT() wG~`[>y (  
 ON_WM_QUERYDRAGICON() 3vuivU.3  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) p2ogn}`  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) LCZ\4g05  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &|Bc7+/P  
//}}AFX_MSG_MAP _y),J'W^3u  
END_MESSAGE_MAP() tz5e"+Tz  
W=j[V Oq  
BOOL CCaptureDlg::OnInitDialog() Cbg!:Cws  
{ CLRiJ*U  
 CDialog::OnInitDialog(); ZIf  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5* j?E  
 ASSERT(IDM_ABOUTBOX < 0xF000); /I1h2 E  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 3jGWkby0  
 if (pSysMenu != NULL) Y'1S`.  
 { gbI^2=YT'  
  CString strAboutMenu; mkYqpD7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Sm)Ha:[4  
  if (!strAboutMenu.IsEmpty()) hWM< 0=  
  { mtJ9nC  
   pSysMenu->AppendMenu(MF_SEPARATOR); x}_]A$nV  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Zo|.1pN  
  } !ipR$ dM  
 } =T -&j60  
 SetIcon(m_hIcon, TRUE); // Set big icon |uX,5Q#6  
 SetIcon(m_hIcon, FALSE); // Set small icon !j:9`XD|  
 m_Key.SetCurSel(0); ,I7E[LU  
 RegisterHotkey(); 2/?`J  
 CMenu* pMenu=GetSystemMenu(FALSE); mR&H9 NG  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); c#|raXGT  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); nH`Q#ZFz]?  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <D:.(AUeO  
 return TRUE; // return TRUE unless you set the focus to a control q|j2MV5#g  
} (a[y1{DLy  
_kj wFq  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ur3(HL  
{ S4'   
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) T;L>;E>B  
 { (MR_^t  
  CAboutDlg dlgAbout; zfc'=ODX  
  dlgAbout.DoModal(); SW*"\X;  
 } :ctu5{"UJ  
 else _oHNkKQ  
 { Yn@lr6s  
  CDialog::OnSysCommand(nID, lParam); :K-~fA%kt?  
 }  Q?nN!e T  
} U* i{5/$  
qu-B| MuOa  
void CCaptureDlg::OnPaint() ~tBYIkvWT  
{ {l>yi  
 if (IsIconic()) B.dH(um  
 {  Of"  
  CPaintDC dc(this); // device context for painting %5eY'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2>cGH7EBD  
  // Center icon in client rectangle 4?ICy/,U-  
  int cxIcon = GetSystemMetrics(SM_CXICON); gLE:g5v6  
  int cyIcon = GetSystemMetrics(SM_CYICON); I,0q4  
  CRect rect; JBi*P.79^  
  GetClientRect(&rect); J&M o%"[)  
  int x = (rect.Width() - cxIcon + 1) / 2; 7[> 6i  
  int y = (rect.Height() - cyIcon + 1) / 2; b\3Oyp>  
  // Draw the icon `V`lo,"\  
  dc.DrawIcon(x, y, m_hIcon); ht2\y&si  
 } AfX}y+Ah  
 else O_ChxX0KP  
 { QWD'!)Zb  
  CDialog::OnPaint(); xD5:RE~g  
 } j/fzzI0@  
} f|B=_p80  
V8rx#H~  
HCURSOR CCaptureDlg::OnQueryDragIcon() pm_`>3  
{ } ud0&Oe{  
 return (HCURSOR) m_hIcon; *VFf.aPwYi  
} g+pml*LJ  
K? y[V1,  
void CCaptureDlg::OnCancel() vbb 5f#WZ  
{ )2bvQy8K  
 if(bTray) 4x  
  DeleteIcon(); ~R22?g.  
  CDialog::OnCancel(); 1DE1.1  
} ;A]@4*q  
{@+Ty]e  
void CCaptureDlg::OnAbout() %>~sJ0  
{ 4kBaB  
 CAboutDlg dlg; Q4+gAS9  
 dlg.DoModal(); d/[; `ZD+  
} @6wFst\t  
yzerOL  
void CCaptureDlg::OnBrowse() *M:B\ D  
{ <kGU,@6PF  
 CString str; In18_ bc  
 BROWSEINFO bi; r[4tPk  
 char name[MAX_PATH]; M%ICdIc'  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ` :o4'CG  
 bi.hwndOwner=GetSafeHwnd(); 9QDFEYG  
 bi.pszDisplayName=name; 8,C*4y~  
 bi.lpszTitle="Select folder"; y~q8pH1  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; T)H{  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); H5Z$*4%G  
 if(idl==NULL) $, ,op(  
  return; Jtr"NS?a]  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); IF44F3(V4  
 str.ReleaseBuffer(); syaPpM Q-  
 m_Path=str; nm6h%}xND<  
 if(str.GetAt(str.GetLength()-1)!='\\') ~]nSSD)\  
  m_Path+="\\"; f"%{%M$K  
 UpdateData(FALSE); +y&Tf#.V/A  
} y%%}k  
bgK'{_o-  
void CCaptureDlg::SaveBmp() _#r+ !e  
{ E`?3PA8  
 CDC dc; [co% :xJu  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); n/+.s(7c  
 CBitmap bm; mj9 <%P  
 int Width=GetSystemMetrics(SM_CXSCREEN); +VO-oFE|  
 int Height=GetSystemMetrics(SM_CYSCREEN); L&u$t}~)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @cFJeOC|  
 CDC tdc; (C@mLu)  
 tdc.CreateCompatibleDC(&dc); I@yCTl uV$  
 CBitmap*pOld=tdc.SelectObject(&bm); K i'Fn"  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5@+,Xh,H|t  
 tdc.SelectObject(pOld); X*{2[+<o  
 BITMAP btm; _$ +^q-  
 bm.GetBitmap(&btm); |4B:<x   
 DWORD size=btm.bmWidthBytes*btm.bmHeight; <Bw^!.jAF  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); X!9 B2w  
 BITMAPINFOHEADER bih; KX'{[7}m'  
 bih.biBitCount=btm.bmBitsPixel; *7ZN]/VRT  
 bih.biClrImportant=0; a1_GIM0  
 bih.biClrUsed=0; Jl#%uU/sx  
 bih.biCompression=0; vb<oi&X  
 bih.biHeight=btm.bmHeight; Y8-86 *zC  
 bih.biPlanes=1; f;W|\z'  
 bih.biSize=sizeof(BITMAPINFOHEADER); LR".pH13  
 bih.biSizeImage=size; nV-mPyfL8  
 bih.biWidth=btm.bmWidth; ^,/RO5  
 bih.biXPelsPerMeter=0; .k%[4:Fe  
 bih.biYPelsPerMeter=0; ? 4q4J8j  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;[=8B \?  
 static int filecount=0; (9Ux{@$o[  
 CString name; v(ZYS']d2  
 name.Format("pict%04d.bmp",filecount++); tjdaaN#,V  
 name=m_Path+name; t!r A%*  
 BITMAPFILEHEADER bfh; ihIVUu-M  
 bfh.bfReserved1=bfh.bfReserved2=0; \=:~ki=@B  
 bfh.bfType=((WORD)('M'<< 8)|'B'); j g8fU  
 bfh.bfSize=54+size; 57umx`m  
 bfh.bfOffBits=54; .QZaGw=,z  
 CFile bf; _qw?@478  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ i3 6eBjT  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));  SL#0kc0x  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); hc>HQrd  
  bf.WriteHuge(lpData,size); &jslyQ#  
  bf.Close(); mID"^NOi#  
  nCount++; 3?V_BUoON  
 } H!5\v"]WB  
 GlobalFreePtr(lpData); 9~]~#Uj  
 if(nCount==1) G Uon/G8  
  m_Number.Format("%d picture captured.",nCount); "4ri SxEyF  
 else 4dO~C  
  m_Number.Format("%d pictures captured.",nCount); eYN5;bx)W  
  UpdateData(FALSE); 6{n!Cb[e  
} F'4w;-ax  
1(I6.BHW  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) e4HA7=z  
{ ew#B [[  
 if(pMsg -> message == WM_KEYDOWN) xv(9IEjt0  
 { pTPi@SBaP{  
  if(pMsg -> wParam == VK_ESCAPE) lI*o@wQg  
   return TRUE; = \'}g?  
  if(pMsg -> wParam == VK_RETURN) x:),P-~w  
   return TRUE; m[~V/N3  
 } Xejo_SV&?  
 return CDialog::PreTranslateMessage(pMsg); jL%x7?*U0  
} 8Kg n"M3  
j|U#)v/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) r+":'/[x  
{ rH_\ d?b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ nqI@Y)  
  SaveBmp(); eg(6^:z?f  
  return FALSE; FbS|~Rp~  
} gW>uR3Ca4  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){  gQ'zW  
 CMenu pop; #_6I w`0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Q=AavKn#  
 CMenu*pMenu=pop.GetSubMenu(0); :S<f?* }:  
 pMenu->SetDefaultItem(ID_EXITICON); 8$6Y{$&C  
 CPoint pt; o4m\~as)Y  
 GetCursorPos(&pt); k5:G-BQ:  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9 Vkb>yFX'  
 if(id==ID_EXITICON) 'p> Ra/4  
  DeleteIcon(); mZSD(  
 else if(id==ID_EXIT) sf)EMh3Z  
  OnCancel(); L ^q""[  
 return FALSE; w80oXXs[#  
} ,l !Ta "  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `Aw^H!  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) . $BUw  
 AddIcon(); xF;kT BRi  
 return res; _P0T)-X\(  
} $*e2YQdLo  
B* ?]H*K  
void CCaptureDlg::AddIcon() DJ'zz&K  
{ coW:DFX  
 NOTIFYICONDATA data; &dM. d!  
 data.cbSize=sizeof(NOTIFYICONDATA); 41`n1:-]  
 CString tip; w_.F' E  
 tip.LoadString(IDS_ICONTIP); mq@6Q\Z+  
 data.hIcon=GetIcon(0); ii T"5`KY  
 data.hWnd=GetSafeHwnd(); 9oYgl1}d  
 strcpy(data.szTip,tip); * @ 3Ag(  
 data.uCallbackMessage=IDM_SHELL; K#6P}tf  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &J[:awQX  
 data.uID=98; "iy  
 Shell_NotifyIcon(NIM_ADD,&data); %zG;Q@  
 ShowWindow(SW_HIDE); w65K[l;2  
 bTray=TRUE; 1S{D6#bE  
} J]{QB^?  
y0sR6TY)f  
void CCaptureDlg::DeleteIcon()  Uwf +  
{ yv t.  
 NOTIFYICONDATA data; ]A~WIF  
 data.cbSize=sizeof(NOTIFYICONDATA); > V-A;S:  
 data.hWnd=GetSafeHwnd(); [@VP?74  
 data.uID=98; */sS`/Lx  
 Shell_NotifyIcon(NIM_DELETE,&data); ojcA<60 '  
 ShowWindow(SW_SHOW); 8aK)#tNWN  
 SetForegroundWindow(); A P)L:7w'e  
 ShowWindow(SW_SHOWNORMAL); Bt@^+vH ~  
 bTray=FALSE; Q# ~Q=T'<  
} ur)9x^y  
Of*Pw[vD  
void CCaptureDlg::OnChange() &S~zNl^m  
{ z* ^_)Z  
 RegisterHotkey(); tr<Nm6!  
} v- 2:(I V  
 `=4r+  
BOOL CCaptureDlg::RegisterHotkey() BmbyH{4  
{ ns9U/ :L  
 UpdateData(); ZGexdc%  
 UCHAR mask=0; wxKX{Bs  
 UCHAR key=0; ?qPo=~y01  
 if(m_bControl) uxXBEq;  
  mask|=4; @i 2E\}  
 if(m_bAlt) "|EM;o  
  mask|=2; h;p>o75O  
 if(m_bShift) r+A{JHnN  
  mask|=1; |,S+@"0#  
  key=Key_Table[m_Key.GetCurSel()]; ;D3C >7y  
 if(bRegistered){ 3eb%OEMYk  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ;Y 00TGU  
  bRegistered=FALSE; 9]k @Q_  
 } 9B{k , 1  
 cMask=mask; GZEc l'h*  
 cKey=key; SW H2  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); zwhe  
 return bRegistered; f86XkECZ;`  
} D9<!mH  
p2#)A"  
  四、小结 !\-{D$E?H  
$Ipg&`S"  
  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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