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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: op/_ :#&'  
  )o~/yB7  
  一、实现方法 $f _C~O  
9XYm8g'X  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ce#Iu#qT  
Zoc4@% n  
#pragma data_seg("shareddata") 4x&Dz0[[S  
HHOOK hHook =NULL; //钩子句柄 5Po:$(  
UINT nHookCount =0; //挂接的程序数目 " dGN0i  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 cWG%>.`5r  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 mQ<4(qd)  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey .p.( \5Fo  
static int KeyCount =0; )hl7)~S<  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 10h; N[  
#pragma data_seg() 8V}|(b#  
;N(L,  
  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。 rM^2yr7H  
/t`,7y 3T  
  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: W!R0:-  
|O6/p7+.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR M)!"R [V  
cKey,UCHAR cMask) \b%c_e  
{ FNuE-_  
 BOOL bAdded=FALSE; ,}]v7DD  
 for(int index=0;index<MAX_KEY;index++){ =+K?@;?  
  if(hCallWnd[index]==0){ ZgG~xl\My  
   hCallWnd[index]=hWnd; *l 4[`7|  
   HotKey[index]=cKey; -)^vO*b 0  
   HotKeyMask[index]=cMask; j{r@>g;3  
   bAdded=TRUE; |U;O HS  
   KeyCount++; (&Jo. <  
   break; _Y ;tD  
  } Ihf)gfHj  
 } +v 3: \#  
 return bAdded; Su7N?X!  
} K:jn^JN$  
//删除热键 i!}6FB Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Axns  
{ 2"?DaX  
 BOOL bRemoved=FALSE; SepwMB4@  
 for(int index=0;index<MAX_KEY;index++){ J'sa{/ #  
  if(hCallWnd[index]==hWnd){ #+p-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $pAJ$0=sw  
    hCallWnd[index]=NULL; W90!*1  
    HotKey[index]=0; J9!/C#Fm  
    HotKeyMask[index]=0; YC8IwyL'  
    bRemoved=TRUE; yU&;\'  
    KeyCount--; ~v;+-*t  
    break; +B1&bOb  
   } [tof+0Y6  
  } B~ i  
 } ]vB\yQE  
 return bRemoved; ^~-YS-.J#,  
} te2vv]W1  
KcpYHWCa.  
+|d]\WlJ  
  DLL中的钩子函数如下: [.fh2XrVM  
"Kp#Lx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) GJZjQH-#P  
{ bY.VNA  
 BOOL bProcessed=FALSE; ZSK_Lux>  
 if(HC_ACTION==nCode) c'tQA  
 { (m,H 5  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [ 5}Q  
   switch(wParam) Nj3iZD|  
   {  u%e~a]  
    case VK_MENU: Pb>/b\&JS  
     MaskBits&=~ALTBIT; YLQ0UeDN'  
     break; 6];3h>c]N  
    case VK_CONTROL: KS93v9|  
     MaskBits&=~CTRLBIT; .!KsF h,pK  
     break;  {Ba&  
    case VK_SHIFT: YwET.(oo  
     MaskBits&=~SHIFTBIT; H}5WglV.  
     break; vE'{?C=EM  
    default: //judge the key and send message <^Vj1s  
     break; :=;{w~D  
   } }R#W<4:  
   for(int index=0;index<MAX_KEY;index++){ Ve|:k5z  
    if(hCallWnd[index]==NULL) GnW MI1$  
     continue; ;j/$%lC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aH{)|?  
    { ltgtD k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); J??AU0 vh  
     bProcessed=TRUE; lP`BKc,  
    } \alV #>J5  
   } O7VEyQqf5  
  } F""9O6u  
  else if((lParam&0xc000ffff)==1){ //有键按下 |EX=Rj*  
   switch(wParam) }q@#M8b  
   { .7^(~&5N  
    case VK_MENU: ]<f(@]R/d  
     MaskBits|=ALTBIT; iO5g30l  
     break; aim\ 3y~  
    case VK_CONTROL: 8]&:'  
     MaskBits|=CTRLBIT; T8z?_ *k  
     break; }Cu[x'J  
    case VK_SHIFT: WM ?a1j  
     MaskBits|=SHIFTBIT; UTyV6~  
     break; hk4t #Km  
    default: //judge the key and send message &;d N:F;  
     break; vHpw?(]  
   } kaekH*m~  
   for(int index=0;index<MAX_KEY;index++){ ulIEx~qP  
    if(hCallWnd[index]==NULL) 5F~l;zT  
     continue; D1xGUz2r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]qv0Y~+`-K  
    { Yu3S3aRE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); H"l4b4)N\  
     bProcessed=TRUE;  rvd $4l^  
    } 950N\Y @u  
   } %|(c?`2|  
  } WsV"`ij#  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 p 4> ThpX  
   for(int index=0;index<MAX_KEY;index++){ 70c]|5  
    if(hCallWnd[index]==NULL) lJu^Bcrv  
     continue; {s0%XG1$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Y\-xX:n.\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); UrvUt$WO  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 pVy=rS-  
   } 0wv#AT  
  } 1}DA| !~  
 } xeU|5-d'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,O5X80'.g  
} zg<-%r'$  
. |T=T0^  
  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: B]"`}jn  
^_bG{du  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); aP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t Y  
V[nPTYO4  
  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: g;63$_<  
v<!S_7h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kKSGC?d  
{ xGwImF$r  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;3cbXc@]  
 { eTS}-  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $5&%X'jk  
  SaveBmp(); ^r\ rpSN  
  return FALSE; JkAM:,^(  
 } sg $db62>  
 …… //其它处理及默认处理 13!@L bC  
} }~I!'J#)  
yQ[;y~W  
z5fE<=<X_W  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 njy2pDC@  
:jl*Y-mM  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 C:J;'[,S  
XA2Ld  
  二、编程步骤 NZq-%bE  
CjQO5  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; [b3!H{b#  
QF"7.~~2  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; MuY:(zC%  
>q:%?mi  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; crM5&L9zF  
@N>7+ 4  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; yV{B,T`W  
r<+C,h;aww  
  5、 添加代码,编译运行程序。 k5S;G"i J  
AatSN@,~z  
三、程序代码 [MTd<@  
!LN8=u.  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL jfxNV2[  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) wX"hUu  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ i?6&4  
#if _MSC_VER > 1000 Q Q3<)i  
#pragma once >j5\J_( ;D  
#endif // _MSC_VER > 1000 X1| +9  
#ifndef __AFXWIN_H__ 7=6:ZSI  
#error include 'stdafx.h' before including this file for PCH q9/v\~m  
#endif )5Khl"6!z  
#include "resource.h" // main symbols K&L!O3#(  
class CHookApp : public CWinApp _ >OP  
{ uYUFxm  
 public: XQ]K,# i  
  CHookApp(); h:%,>I%{  
  // Overrides d/7fJ8y8  
  // ClassWizard generated virtual function overrides MgJ6{xzz  
  //{{AFX_VIRTUAL(CHookApp) cfLF@LW!])  
 public: aDbqh~7  
  virtual BOOL InitInstance(); i 9) G t  
  virtual int ExitInstance(); 3B&A)&pEO  
  //}}AFX_VIRTUAL Xul`>8y|  
  //{{AFX_MSG(CHookApp) c?A$Y?|9  
  // NOTE - the ClassWizard will add and remove member functions here. v"bWVc~H  
  // DO NOT EDIT what you see in these blocks of generated code ! T`bYidA  
  //}}AFX_MSG a('0l2e<u9  
  DECLARE_MESSAGE_MAP() &GP(yj]  
}; /s\ m V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); g&Vhu8kNIA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }Ce9R2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7OV^>"S  
BOOL InitHotkey(); hw DxGiU  
BOOL UnInit(); hhTtxC<:  
#endif nh} Xu~#_  
INg0[Lpc  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. sU_K^=6*  
#include "stdafx.h" f@OH~4FG  
#include "hook.h" o7) y~ ke  
#include <windowsx.h> )(}[S:`  
#ifdef _DEBUG -H-U8/WC  
#define new DEBUG_NEW sl'4AK~\  
#undef THIS_FILE hg)Xr5>  
static char THIS_FILE[] = __FILE__; ;s B=f  
#endif Th)  
#define MAX_KEY 100 5 D|#l*V  
#define CTRLBIT 0x04 DSrU7#  
#define ALTBIT 0x02 Q dj(D\.  
#define SHIFTBIT 0x01 wNf:_^|}  
#pragma data_seg("shareddata") .a%6A#<X  
HHOOK hHook =NULL; *[Hp&6f  
UINT nHookCount =0; m%HT)`>bg  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey e+[*4)Qfy  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Xoe|]@U`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey S,&LH-ps   
static int KeyCount =0; VE |:k:};  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ^h[6{F~J  
#pragma data_seg() 1W USp;JMl  
HINSTANCE hins; ZbFD|~[ V  
void VerifyWindow(); 'oa.-g5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 5nG\J g7  
//{{AFX_MSG_MAP(CHookApp) "Lp.*o  
// NOTE - the ClassWizard will add and remove mapping macros here. W5R/Ub@g  
// DO NOT EDIT what you see in these blocks of generated code! ng1E'c]0@  
//}}AFX_MSG_MAP k<9,Ypa  
END_MESSAGE_MAP() iQG!-.aX  
tr0b#4  
CHookApp::CHookApp() H,7='n7"  
{ %BI8m|6  
 // TODO: add construction code here, P3oYk_oW  
 // Place all significant initialization in InitInstance Xb _ V\b0  
} S:xXD^n#H  
L!Jx`zM^  
CHookApp theApp; c1H.v^Y5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2q?/aw ;Z  
{ {]CZgqE{  
 BOOL bProcessed=FALSE; vt EfH  
 if(HC_ACTION==nCode) 46?z*~*G  
 { W{,fpm  
  if((lParam&0xc0000000)==0xc0000000){// Key up Hv/C40uM-  
   switch(wParam) K; #FU  
   { m<gdyY   
    case VK_MENU: }+,Q&]>~  
     MaskBits&=~ALTBIT; W|PAI [N  
     break; j=0kxvp  
    case VK_CONTROL: l)u%`Hcn  
     MaskBits&=~CTRLBIT; !wYN",R-  
     break; ?JuJu1  
    case VK_SHIFT: pH'Tx>  
     MaskBits&=~SHIFTBIT; ^twyy9VR  
     break; iq;\},  
    default: //judge the key and send message 579Q&|L.  
     break; e,(Vy  
   } N.|F8b]v  
   for(int index=0;index<MAX_KEY;index++){ T8 FW(Gw#  
    if(hCallWnd[index]==NULL) mR0`wrt  
     continue; (j8*F Bq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7K"3[.  
    { z teu{0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Kw fd S(  
     bProcessed=TRUE; <J8c dB!e  
    } ?eJ'$  
   } ,EQ0""G!  
  } #$WnMJ@  
  else if((lParam&0xc000ffff)==1){ //Key down &9e  
   switch(wParam) v`h>5#_[  
   { d?oXz|;H(  
    case VK_MENU: %JeND XbI4  
     MaskBits|=ALTBIT; m(f`=+lqI`  
     break; frcAXh9  
    case VK_CONTROL: bJ2-lU% ;2  
     MaskBits|=CTRLBIT; ]OpGD5jZ  
     break; cW3'057  
    case VK_SHIFT: wSR|uh  
     MaskBits|=SHIFTBIT; Zg+.`>z  
     break; igu1s}F  
    default: //judge the key and send message l$u52e!7  
     break; '/GB8L  
   } +w0Wg.4V  
   for(int index=0;index<MAX_KEY;index++) Ana[>wSZO@  
   { -@AhJY.  
    if(hCallWnd[index]==NULL) F}Zg3 #  
     continue; =Uk #7U"P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <$A,|m  
    { uQdeKp4(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); f1NHW|_j  
     bProcessed=TRUE; wBt7S!>G  
    } -Mo4`bN  
   } |q4=*Xq  
  } dv. 77q  
  if(!bProcessed){ TOiLv.Dor  
   for(int index=0;index<MAX_KEY;index++){ {aE[h[=r  
    if(hCallWnd[index]==NULL) u6C_*i{2  
     continue; fw%p_Cm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) C:1(<1K  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); BB}WfA  
   } @3n!5XM{EE  
  } ivo3 pibk%  
 } 2I:P}!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $_JfM^w  
} 0+mR y57  
9fp"r,aHN&  
BOOL InitHotkey() m{>1# 1;$t  
{ Z|K HF"  
 if(hHook!=NULL){ uGAQt9$>_  
  nHookCount++; Rk9n,"xpv  
  return TRUE; yz [pF  
 } aG1Fj[,  
 else - ~z@W3\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); T4x%3-4 ;  
  if(hHook!=NULL) .XgY&5Qk  
   nHookCount++; wPU5L*/*i  
  return (hHook!=NULL); Y6wr}U  
} !>(uhuTBF  
BOOL UnInit() :V(C+bm *  
{ fBX@ MedC  
 if(nHookCount>1){ %:C6\4  
  nHookCount--; gLMb,buqC  
  return TRUE; WX Fm'5Vr  
 } W~H`{x%Av>  
 BOOL unhooked = UnhookWindowsHookEx(hHook); /[c_,G" "  
 if(unhooked==TRUE){ /J}G{Y |n  
  nHookCount=0; Qi\]='C  
  hHook=NULL; g_4%M0&AX  
 } EG4~[5[YgI  
 return unhooked; `n,RC2yo  
} h.-L_!1B7  
G5hRx@vfrL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `K VSYC  
{ /Ey%aA4v  
 BOOL bAdded=FALSE; =U84*HAv  
 for(int index=0;index<MAX_KEY;index++){ ~{DJ,(N"n  
  if(hCallWnd[index]==0){ {"jtR<{)  
   hCallWnd[index]=hWnd; @o[ZJ4>*  
   HotKey[index]=cKey;  XY)X-K$  
   HotKeyMask[index]=cMask; Q'U!  
   bAdded=TRUE; gZHgL7@  
   KeyCount++; $\/i t  
   break; +PPQ"#1pS  
  } pI f6RwH}%  
 } T Tbe{nb  
 return bAdded; @Mg&T$  
} ](I||JJa9f  
UR'v;V&Cb\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) koB'Zp/FaY  
{ 9T;>gm  
 BOOL bRemoved=FALSE; dLqBu~*  
 for(int index=0;index<MAX_KEY;index++){ T T 3 6Y  
  if(hCallWnd[index]==hWnd){ bV:<%l]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Jd `Qa+  
    hCallWnd[index]=NULL;  U :x;4  
    HotKey[index]=0; NxJnU<g-  
    HotKeyMask[index]=0; 2KO`+  
    bRemoved=TRUE; wv3*o10_w8  
    KeyCount--; q%d,E1  
    break; ^vm6JWwN0B  
   } "E<+idoz  
  } v2gk1a &  
 } BZLIi O  
 return bRemoved; .{eMN[ n@  
} ]@y%j'e  
3L2NenJB  
void VerifyWindow() Y'1 KH}sH  
{ L5UZ@R,  
 for(int i=0;i<MAX_KEY;i++){ !Th5x2  
  if(hCallWnd!=NULL){ XFTqt]  
   if(!IsWindow(hCallWnd)){ XX-(>B0L  
    hCallWnd=NULL; (k+*0.T&?  
    HotKey=0; Ay Uw  
    HotKeyMask=0; z}}P+P/  
    KeyCount--; "+2Cs  
   } ,e|"p[z ~T  
  } B0 A`@9  
 } z\FBN=54z  
} 4'3;{k$z  
0"j:-1  
BOOL CHookApp::InitInstance() ^$dbyj`  
{ $+2QbEk&-  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); NxA4*_|H9  
 hins=AfxGetInstanceHandle(); P cbhylKd  
 InitHotkey(); /\Cf*cJ  
 return CWinApp::InitInstance(); jD<xpD  
} 6 o   
W.s8!KH:  
int CHookApp::ExitInstance() erv94acq  
{ G8'{nPA~  
 VerifyWindow(); }>y !I5O  
 UnInit(); Rkg)yme!N  
 return CWinApp::ExitInstance(); An}RD73!w  
} h+Lpj^<2a  
{tOf0W|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file yQ^,>eh  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) P )oNNY6}  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Y(aUB$"  
#if _MSC_VER > 1000 PN99 R]K0g  
#pragma once P3!@}!r8  
#endif // _MSC_VER > 1000 "N'W~XPG  
D 9;pjY  
class CCaptureDlg : public CDialog vC1fKo\p  
{ L9^ M?.a  
 // Construction &2%|?f|  
 public: Mb"y{Fox  
  BOOL bTray; k8J zey]X  
  BOOL bRegistered; oM>UIDCY_v  
  BOOL RegisterHotkey(); Y6Y"fb%K  
  UCHAR cKey; C(h<s e?  
  UCHAR cMask; i@D4bd9lR  
  void DeleteIcon(); m<#^c?u  
  void AddIcon(); atd;)o0*0  
  UINT nCount; ,j{tGj_  
  void SaveBmp(); ]7TOA$Q  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor UsA fZg8  
  // Dialog Data E,ilJl\  
  //{{AFX_DATA(CCaptureDlg) &'zc2  
  enum { IDD = IDD_CAPTURE_DIALOG }; t%e<]2-8  
  CComboBox m_Key; ]Hl{(v\H O  
  BOOL m_bControl; :B=Gb8?  
  BOOL m_bAlt; ^B%ki  
  BOOL m_bShift; .* `]x  
  CString m_Path; @J>JZ7m]\  
  CString m_Number; SHSfe{n  
  //}}AFX_DATA bxwwYSS  
  // ClassWizard generated virtual function overrides z}==6| {  
  //{{AFX_VIRTUAL(CCaptureDlg) teb(gUy}L6  
 public: 6DU(KYN  
  virtual BOOL PreTranslateMessage(MSG* pMsg); %=*|: v  
 protected: 8G$BQ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <L*`WO]\l  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); wA 7\K~fHV  
  //}}AFX_VIRTUAL #X1a v  
  // Implementation 7. $wK.  
 protected: >}+R+''nR  
  HICON m_hIcon; :81d~f7  
  // Generated message map functions {A< 961  
  //{{AFX_MSG(CCaptureDlg) h|PC?@jp  
  virtual BOOL OnInitDialog(); cR!M{U.q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Hn(Eut7%  
  afx_msg void OnPaint(); #Vmf 6  
  afx_msg HCURSOR OnQueryDragIcon(); 7f k)a  
  virtual void OnCancel(); ~a4Y8r  
  afx_msg void OnAbout(); ex`T 9j.=B  
  afx_msg void OnBrowse(); ~uq010lMno  
  afx_msg void OnChange(); `YwJ.E  
 //}}AFX_MSG yEjiMtQll]  
 DECLARE_MESSAGE_MAP() \p.yR.  
}; >l%8d'=Jl  
#endif F_-xp1|  
8oI|Z=  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /;}%E  
#include "stdafx.h" J2 )h":2  
#include "Capture.h" {9{X\|  
#include "CaptureDlg.h" co\Il]`R/  
#include <windowsx.h> - 7T`/6  
#pragma comment(lib,"hook.lib") a6;[Z  
#ifdef _DEBUG .`_iWfK  
#define new DEBUG_NEW i5Sya]FN  
#undef THIS_FILE : qK-Rku  
static char THIS_FILE[] = __FILE__; e T;@pc  
#endif 9.xRDk  
#define IDM_SHELL WM_USER+1 #C.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #Ff8_xhP2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }wp/,\_ >  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; }ssja,;  
class CAboutDlg : public CDialog }6.@  
{ EFx>Hu/ [G  
 public: 'nM4t  
  CAboutDlg(); g-UCvY I  
  // Dialog Data / yBrlf  
  //{{AFX_DATA(CAboutDlg) /W*Z.  
  enum { IDD = IDD_ABOUTBOX }; ]&P\|b1*g  
  //}}AFX_DATA {K"hlu[  
  // ClassWizard generated virtual function overrides H"UJBO>$  
  //{{AFX_VIRTUAL(CAboutDlg) f@hM^%  
 protected: c'3N;sZ*B  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 45wtl/^9  
  //}}AFX_VIRTUAL iSoQ1#MP)2  
  // Implementation 8kdJtEW3  
 protected: T\$i=,_$  
  //{{AFX_MSG(CAboutDlg) -8FUR~WJ  
  //}}AFX_MSG Nb9GrYIS  
  DECLARE_MESSAGE_MAP() Bf #cBI  
}; R3a}YwJFXF  
^Y+C!I  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *{+{h;p  
{ e Bxm  
 //{{AFX_DATA_INIT(CAboutDlg) E X'PRNB,  
 //}}AFX_DATA_INIT a9p:k ]{  
} ! #! MTk  
ILAn2W  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 2IM 31 .  
{ YI7M%B9Lj  
 CDialog::DoDataExchange(pDX); Mth:V45G|  
 //{{AFX_DATA_MAP(CAboutDlg) ti%RE:*  
 //}}AFX_DATA_MAP <,GVrVH=t"  
} IKP GqoM  
S:}"gwFM  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &*7KQd  
 //{{AFX_MSG_MAP(CAboutDlg) 9NU0K2S  
 // No message handlers p$|7T31 *  
 //}}AFX_MSG_MAP eZU9L/w:  
END_MESSAGE_MAP() -j]k^  
jMTM:~0N  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]7K2S{/o{  
: CDialog(CCaptureDlg::IDD, pParent) 7`A]X,:  
{ R Qo a  
 //{{AFX_DATA_INIT(CCaptureDlg) < ]1,L%  
  m_bControl = FALSE; K6-M.I  
  m_bAlt = FALSE; J=$\-  
  m_bShift = FALSE; TE+>|}]R  
  m_Path = _T("c:\\"); rqmb<# Z  
  m_Number = _T("0 picture captured."); egG<"e*W}N  
  nCount=0; :yD>Tn;1  
  bRegistered=FALSE; HLwMo&*rA  
  bTray=FALSE; 'n,V*9  
 //}}AFX_DATA_INIT ML\>TDt  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 kO3\v)B;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); cXqYO|3/M  
} C[ mTVxd  
KsOWTq"uj  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) P* `*^r3  
{ 1,;X4/*  
 CDialog::DoDataExchange(pDX); p+V#86(3  
 //{{AFX_DATA_MAP(CCaptureDlg) J,CwC)  
  DDX_Control(pDX, IDC_KEY, m_Key); *QiQ,~Ep  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -GCo`PR?b  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9K`_P] l2z  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 0Z6geBMc  
  DDX_Text(pDX, IDC_PATH, m_Path); I@9'd$YY  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Is7BJ f  
 //}}AFX_DATA_MAP w90YlWS#  
} r niM[7K  
[DM0'4  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^ U mYW  
//{{AFX_MSG_MAP(CCaptureDlg) z.SC^/\o|  
 ON_WM_SYSCOMMAND() bqAW  
 ON_WM_PAINT() mvZ#FF1,J  
 ON_WM_QUERYDRAGICON() s< FBr,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) l^Rb%?4Z  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) LQ# E+id&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) kzRJzJquP  
//}}AFX_MSG_MAP I8 :e `L  
END_MESSAGE_MAP() s4"Os gP+  
-<6?ISF2  
BOOL CCaptureDlg::OnInitDialog() rYr*D[m]  
{ |M?vFF]TN  
 CDialog::OnInitDialog(); b[<RcM{r}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~.%HZzR6&  
 ASSERT(IDM_ABOUTBOX < 0xF000); @GFB{ ;=  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Y"MHs0O5>  
 if (pSysMenu != NULL) l,4O  
 { be,Rj,-  
  CString strAboutMenu; yk`qF'4]  
  strAboutMenu.LoadString(IDS_ABOUTBOX); >SK:b/i  
  if (!strAboutMenu.IsEmpty()) 9KXL6#h  
  { kJ_8|  
   pSysMenu->AppendMenu(MF_SEPARATOR); [Vo5$w  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); V9<`?[Usv  
  } RPW46l34  
 } h <LFTYE@  
 SetIcon(m_hIcon, TRUE); // Set big icon E7MSoBX9M  
 SetIcon(m_hIcon, FALSE); // Set small icon Fye>H6MU  
 m_Key.SetCurSel(0); f_jhQ..g<g  
 RegisterHotkey(); AzOs/q8O  
 CMenu* pMenu=GetSystemMenu(FALSE); ;2<5^hgk  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {?H5Pw>{%h  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); XnQR(r)pR2  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Ku75YFO,5  
 return TRUE; // return TRUE unless you set the focus to a control Oo|PZ_P  
} Ur(R[*2bx  
r0XEB,}  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2jFuF71  
{ u S1O-Q>  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) QJVbt  
 { %tyo(HZQ  
  CAboutDlg dlgAbout; X/,) KTo7  
  dlgAbout.DoModal(); }4A] x`3  
 } qSc-V`*  
 else vQljxRtW  
 { x=oV!x  
  CDialog::OnSysCommand(nID, lParam); 0ra'H/>Ly  
 } gw]%: WeH  
} ;miif  
mn/)_1',  
void CCaptureDlg::OnPaint() c1yRy|  
{ I,{YxY[$7  
 if (IsIconic()) LjI`$r.B  
 { X8$i*#D  
  CPaintDC dc(this); // device context for painting `x[Is$  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6O7s^d&K  
  // Center icon in client rectangle Wo 1x ZZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); 4dX{an]Cz  
  int cyIcon = GetSystemMetrics(SM_CYICON); s<s}6|Z  
  CRect rect; 8=`L#FkRp  
  GetClientRect(&rect); ).SJ*Re*^I  
  int x = (rect.Width() - cxIcon + 1) / 2; k QuEG5n.-  
  int y = (rect.Height() - cyIcon + 1) / 2; R~\R>\  
  // Draw the icon =yf) Z^  
  dc.DrawIcon(x, y, m_hIcon); ZZY#.  
 } K~TwyB-h  
 else e&}W#  
 { IfK~~XYG  
  CDialog::OnPaint(); =-h^j  
 } cS;3,#$  
} SVe]2ONd  
9TW[;P2> )  
HCURSOR CCaptureDlg::OnQueryDragIcon() D=0YLQ*rP  
{ O3} JOv_  
 return (HCURSOR) m_hIcon; EwC]%BZP  
} x b,XI/  
k]~o=MLmj  
void CCaptureDlg::OnCancel() } oPO`  
{ K^u,B3  
 if(bTray) #-0e0  
  DeleteIcon(); 3p%e_?  
  CDialog::OnCancel(); pU$k{^'UK  
} !g@K y$  
u m9yO'[C  
void CCaptureDlg::OnAbout() 'Gy`e-yB  
{ _U s"   
 CAboutDlg dlg; 0:$ }~T9T  
 dlg.DoModal(); M@Th^yF+8H  
} S,m(  
\P<aK$g  
void CCaptureDlg::OnBrowse() 5Gz!Bf@!!  
{ 2S?7j[@%i`  
 CString str; >,e^}K}C  
 BROWSEINFO bi; }[AaI #  
 char name[MAX_PATH]; Vrt$/ d  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); F9fLJol  
 bi.hwndOwner=GetSafeHwnd(); 5,"c1[`-  
 bi.pszDisplayName=name; 2 XP }:e  
 bi.lpszTitle="Select folder"; !HY^QK  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; UA>=# $  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); u]yy%@U1  
 if(idl==NULL) "q=Cye  
  return; (dy(.4W\  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); my (@~'  
 str.ReleaseBuffer(); QAs)zl0  
 m_Path=str; fAs b:P  
 if(str.GetAt(str.GetLength()-1)!='\\') U,Z\)+-R  
  m_Path+="\\"; J @Hg7Faz  
 UpdateData(FALSE); |[SHpcq>  
} I!lDKS,b  
d?zSwLsl  
void CCaptureDlg::SaveBmp() _@DOH2 lXJ  
{ B=|R?t (*  
 CDC dc; w*F[[*j@.  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Qg4D*r\|@  
 CBitmap bm; y )QLR<wf  
 int Width=GetSystemMetrics(SM_CXSCREEN); `YNzcn0x  
 int Height=GetSystemMetrics(SM_CYSCREEN); Sdu\4;(  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #])"1fk  
 CDC tdc; z`{sD]  
 tdc.CreateCompatibleDC(&dc); `3;EJDEdbi  
 CBitmap*pOld=tdc.SelectObject(&bm); l6  G6H$  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); D2$ 9$xeR  
 tdc.SelectObject(pOld); UB$}`39@  
 BITMAP btm; j-<-!jTd  
 bm.GetBitmap(&btm); O_FB^BB  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [`n_> p!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =U]9>  
 BITMAPINFOHEADER bih; OX_y"]utU  
 bih.biBitCount=btm.bmBitsPixel; +_5*4>MC  
 bih.biClrImportant=0; ^^a6 (b  
 bih.biClrUsed=0; .5|[gBK  
 bih.biCompression=0; >?$2`I  
 bih.biHeight=btm.bmHeight; sscbf  
 bih.biPlanes=1; thjr1y.e  
 bih.biSize=sizeof(BITMAPINFOHEADER); Z)@vJZ*7(  
 bih.biSizeImage=size; \5ls <=S.  
 bih.biWidth=btm.bmWidth; n7t}G'*Y!^  
 bih.biXPelsPerMeter=0; _.5{vGyxr  
 bih.biYPelsPerMeter=0; nBy-/BU&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); E'08'8y  
 static int filecount=0; )U&9d  
 CString name; 67j kU!  
 name.Format("pict%04d.bmp",filecount++); ^ja]e%w#  
 name=m_Path+name; yXNr[ 7  
 BITMAPFILEHEADER bfh; Q]WBH_j  
 bfh.bfReserved1=bfh.bfReserved2=0; JRl=j2z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); H$`U] =s|  
 bfh.bfSize=54+size; wWl ?c  
 bfh.bfOffBits=54; ;s +/'(*  
 CFile bf; OSBR2Z;=  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ M':-f3aT%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); F 9%_@n  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `B %%2p&  
  bf.WriteHuge(lpData,size); v;,W ^#`  
  bf.Close(); F2N"aQ&  
  nCount++; "n%j2"TYJj  
 } )N.3Q1g-  
 GlobalFreePtr(lpData); 0L}`fYf  
 if(nCount==1) TU|#Pz7n-Z  
  m_Number.Format("%d picture captured.",nCount); 2F4<3k! &  
 else f_c\uN@f  
  m_Number.Format("%d pictures captured.",nCount); o,7|=.-b  
  UpdateData(FALSE); &~:EmLgv  
} de:@/-|  
f"Sp.'@  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) KuR]X``2  
{ Y@FYo>0O  
 if(pMsg -> message == WM_KEYDOWN) l2F#^=tp  
 { E !kN h  
  if(pMsg -> wParam == VK_ESCAPE)  /YJo"\7  
   return TRUE; 01.q9AGy  
  if(pMsg -> wParam == VK_RETURN) }B0[S_mw  
   return TRUE; <"3q5ic/Z  
 } 72nZ`u  
 return CDialog::PreTranslateMessage(pMsg); ChiIQWFE  
} iv*RE9?^  
pwo$qs(p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "6U0 !.ro@  
{ 9\8ektq}Z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ V(ELrjB0  
  SaveBmp(); xlv(PVdn  
  return FALSE; Gu$/rb?  
} e$9a9twl  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ L^qCE-[  
 CMenu pop; ,^9+G"H:I  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); f I1CT)0<e  
 CMenu*pMenu=pop.GetSubMenu(0); A7L;ims7  
 pMenu->SetDefaultItem(ID_EXITICON); [4"(\r\f  
 CPoint pt; \uZpAV)5  
 GetCursorPos(&pt); /pF8S!,z  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ; hQ[-  
 if(id==ID_EXITICON) 8ZtJvk`  
  DeleteIcon(); "Q@m7j)(  
 else if(id==ID_EXIT) klKUX/ g  
  OnCancel(); )Xdq+$w.  
 return FALSE; v!I z&M:z  
} kFjv'[Y1N  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); dA<%4_WZty  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }83 8F&  
 AddIcon(); .$\-{)  
 return res; 2J=`"6c  
} =%` s-[5b  
d(^8#4  
void CCaptureDlg::AddIcon() Bz'.7" ":0  
{ 0moAmfc  
 NOTIFYICONDATA data; l%+ &V^:  
 data.cbSize=sizeof(NOTIFYICONDATA); k| OM?\  
 CString tip; SPqJ [ F  
 tip.LoadString(IDS_ICONTIP); uO4 LD}A  
 data.hIcon=GetIcon(0); 3eY>LWx  
 data.hWnd=GetSafeHwnd(); Zj[m  
 strcpy(data.szTip,tip); .>W [  
 data.uCallbackMessage=IDM_SHELL; R+!U.:-yz  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4b<|jVl\  
 data.uID=98; ;!f='QuA  
 Shell_NotifyIcon(NIM_ADD,&data); i$kB6B#==  
 ShowWindow(SW_HIDE); WN]k+0#  
 bTray=TRUE; `)cI^!  
} HS |Gz3~  
2)IM<rf'^  
void CCaptureDlg::DeleteIcon() #?)6^uTW  
{ j \r GU){  
 NOTIFYICONDATA data; b_sasZo  
 data.cbSize=sizeof(NOTIFYICONDATA); SY Bp-o  
 data.hWnd=GetSafeHwnd(); & %/p; ::A  
 data.uID=98; K~#?Y,}O  
 Shell_NotifyIcon(NIM_DELETE,&data); e6p3!)@P1  
 ShowWindow(SW_SHOW); sqhMnDn[  
 SetForegroundWindow(); I'xc$f_+  
 ShowWindow(SW_SHOWNORMAL); J* !_O#  
 bTray=FALSE; GP+=b:C{E  
} h] ho? K  
;?u cC@  
void CCaptureDlg::OnChange() pj_W^,*/  
{ @PM<pEve  
 RegisterHotkey(); D2VYw<tEA  
} |ru!C(  
+mjwX?yF  
BOOL CCaptureDlg::RegisterHotkey() A\?t^T  
{ T"99m^y  
 UpdateData(); Tu-lc)  
 UCHAR mask=0; @ 95p[  
 UCHAR key=0; J4eU6W+{  
 if(m_bControl) KKpM=MZ  
  mask|=4; qG,h 1  
 if(m_bAlt) z uNm !$  
  mask|=2; E^J &?-  
 if(m_bShift) }@LIb<Y  
  mask|=1; 0V6, &rTF  
  key=Key_Table[m_Key.GetCurSel()]; q25p3  
 if(bRegistered){ 2|7:`e~h  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ="]lN  
  bRegistered=FALSE; |8E~C~d  
 } r.)n>  
 cMask=mask; yLf9cS6=  
 cKey=key; TeuZVy8a  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); v 8F{qT50  
 return bRegistered; 62nmm/c  
} Kz b-a$  
!84Lvg0&  
  四、小结 yl?LXc[)  
Q=! lbW  
  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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