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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: i$og v2J  
  Q`19YX  
  一、实现方法 @9vz%1B<l  
BT#'<!7!  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 7~|o_T  
aNXu"US+Sp  
#pragma data_seg("shareddata") |n6nRE wW  
HHOOK hHook =NULL; //钩子句柄 )*s.AFu]7x  
UINT nHookCount =0; //挂接的程序数目 '{OZ[$E  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 }GGFJ"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 dAAE2}e  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey '>`bp25>  
static int KeyCount =0; vZXyc *  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #~p1\['|M  
#pragma data_seg() t~@TUTbx  
#;^.&2Lt  
  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。 l|N1u=Z  
,GR(y^S  
  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: RqcX_x(p  
Wb*d`hzQ}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR -4hX -  
cKey,UCHAR cMask) %W`pTvF  
{ V (X)Qu@R  
 BOOL bAdded=FALSE; I{1w8m4O6  
 for(int index=0;index<MAX_KEY;index++){ ?}lCS7&  
  if(hCallWnd[index]==0){ vx-u+/\  
   hCallWnd[index]=hWnd; ]Fj z+CGg  
   HotKey[index]=cKey; YQYN.\  
   HotKeyMask[index]=cMask; QiwZk<rb  
   bAdded=TRUE; = <33(   
   KeyCount++; y4envjl 0  
   break; Ye1P5+W(  
  } yil{RfBEr_  
 } n|^-qy'w  
 return bAdded; jkPXkysm  
} =ohdL_6  
//删除热键 +F67g00T|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?rHc%H  
{ :.sK:W("v  
 BOOL bRemoved=FALSE; 1 k H  
 for(int index=0;index<MAX_KEY;index++){ l}<s~ip  
  if(hCallWnd[index]==hWnd){ ; G E0iSC  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7dU X(D,?  
    hCallWnd[index]=NULL; uYO?Rb&}  
    HotKey[index]=0; y)(@  
    HotKeyMask[index]=0; I s88+,O  
    bRemoved=TRUE; t$UFR7XE  
    KeyCount--; QR^pu.k@  
    break; y8,es$  
   } kuUH 2:L  
  } VY![VnHsB  
 } ^{Mx?]z  
 return bRemoved; @];Xbbw+c  
} 2gFQHV  
J/ rQ42d  
Uvz9x"0[u  
  DLL中的钩子函数如下: H[6d@m- Z  
B;rq{ac!P]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (1TYJ. Z  
{ ^&Qaf:M  
 BOOL bProcessed=FALSE; {O!fV<Vx 9  
 if(HC_ACTION==nCode) Cf%)W:Q9  
 { L(X:=) !K0  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 s!UC{)g,  
   switch(wParam) dn5T7a~   
   {  9Uk9TG5  
    case VK_MENU: V#sANi?mpo  
     MaskBits&=~ALTBIT; +/UInAM  
     break; Ya,>E@oc  
    case VK_CONTROL: \W$>EH  
     MaskBits&=~CTRLBIT; '9RHwKu&s  
     break; ozGK -$  
    case VK_SHIFT: VT0I1KQx.  
     MaskBits&=~SHIFTBIT; tM !1oWH  
     break; I *}:C  
    default: //judge the key and send message w#"c5w~  
     break; [% 3{mAd  
   } 'rd{fe_g!  
   for(int index=0;index<MAX_KEY;index++){ 0 J ANj  
    if(hCallWnd[index]==NULL) V:l; 2rW  
     continue; 0eb`9yM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >0~y "~M  
    { tb_}w@:kU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6%:'2;xM  
     bProcessed=TRUE; Ou,B3kuQ+  
    } &Cdd  
   } 67f#Z&r2k  
  } Ho\z ^w+T`  
  else if((lParam&0xc000ffff)==1){ //有键按下 v'Lckw@G4  
   switch(wParam) f5`exfdHE  
   { s<^UAdLnl  
    case VK_MENU:  ^mG-O  
     MaskBits|=ALTBIT; 2#|Q =rWB  
     break; LR`/pet  
    case VK_CONTROL: aP4r6lLv+  
     MaskBits|=CTRLBIT; N(F9vZOs  
     break; VpJ2Qpd=  
    case VK_SHIFT: GL (YC-{  
     MaskBits|=SHIFTBIT; II[qWs>RG[  
     break; YJr@4!j*  
    default: //judge the key and send message dyu~T{  
     break; eaCEZHr$  
   } 'JRkS'ay  
   for(int index=0;index<MAX_KEY;index++){ "*TnkFTR  
    if(hCallWnd[index]==NULL) =k0l>)  
     continue; +fKLCzj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o>j3<#?  
    { I,q3J1K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -+c_TJ.dC  
     bProcessed=TRUE; -vhgBru  
    } >5XE*9  
   } Xf$,ra"  
  } kbOo;<X9A  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 VE{t]>*-u  
   for(int index=0;index<MAX_KEY;index++){ \t )Zk2  
    if(hCallWnd[index]==NULL) c)lMi}/  
     continue; CJ%7M`zy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Tw|=;m  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); KS%xo6k.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Is%-r.i  
   } u,/PJg-(!  
  } Q%KS$nP9  
 } N )&3(A@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9n44 *sZ  
} NlWIb2,  
\}G/F!  
  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: D(L%fK`+  
%hOe `2#$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6kYn5:BhIi  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Vx?a&{3]-  
.!=2#<  
  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: wVw3YIN#  
_`ot||J  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?l bK;Kv  
{ r=s2wjk  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) |8V+(Vzl  
 { \W #M]Q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 MheP@ [w|@  
  SaveBmp(); 8]+hfB/  
  return FALSE; 8+ Hho@=  
 } U%U%a,rA5s  
 …… //其它处理及默认处理 dp-8,Seu  
} i wK,XnIR  
+=;F vb  
>_tn7Z0 L  
  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。 e|xRK?aVBu  
r@k&1*&  
  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。 hb[K.`g  
%0=|WnF-  
  二、编程步骤 }0c'hWMZ}  
;pS Wu9  
  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"; >CNH=  
42X[Huy]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 2z&HT SI  
m!w(Q+*j  
  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; JAc-5e4  
;R|5sCb/m  
  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; o3j4XrK  
-:>Mi5/ s  
  5、 添加代码,编译运行程序。 *7DQ#bD  
0FHN  
三、程序代码 .gx*gX1<  
p \F*Y,4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL :/d#U:I  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #L[Atx  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ l.Qj?G  
#if _MSC_VER > 1000 YzsHec  
#pragma once So,EPB+  
#endif // _MSC_VER > 1000 OG/R6k.  
#ifndef __AFXWIN_H__ `3\5&Bf  
#error include 'stdafx.h' before including this file for PCH s#64NG  
#endif beN0 ?G  
#include "resource.h" // main symbols !V#(g./W  
class CHookApp : public CWinApp U")bvUIL  
{ MhWmY[  
 public: aJK8G,Vk  
  CHookApp(); jh2D 9h  
  // Overrides U(.Ln@sq  
  // ClassWizard generated virtual function overrides ]KLj Qpd  
  //{{AFX_VIRTUAL(CHookApp) lP\7=9rh^x  
 public: c9r, <TR9  
  virtual BOOL InitInstance(); 3Sf <oYF  
  virtual int ExitInstance(); )>C,y`,  
  //}}AFX_VIRTUAL E0Ig/ j  
  //{{AFX_MSG(CHookApp) >>F E?@  
  // NOTE - the ClassWizard will add and remove member functions here. 9;sebqC?  
  // DO NOT EDIT what you see in these blocks of generated code ! @aWvN;v  
  //}}AFX_MSG W=%}~ 7*  
  DECLARE_MESSAGE_MAP() d1vC-n N  
}; {!Jw+LPv$$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ,o*x\jrGw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vRYfB{~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *Xn{{  
BOOL InitHotkey(); *oKc4S+  
BOOL UnInit(); b~WiE?  
#endif bK<'J=#1  
Rs8^ 27  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. J *5 )g  
#include "stdafx.h" `o)rAD^e  
#include "hook.h" %F]4)XeW-+  
#include <windowsx.h> K;k&w; j  
#ifdef _DEBUG q0SYV  
#define new DEBUG_NEW $0+AR)  
#undef THIS_FILE {D 9m// x  
static char THIS_FILE[] = __FILE__; G;>b}\Ng  
#endif 7GB>m}7  
#define MAX_KEY 100 &r;-=ASYzV  
#define CTRLBIT 0x04 TW7jp  
#define ALTBIT 0x02 _>S."cm}!k  
#define SHIFTBIT 0x01 v#8{pr  
#pragma data_seg("shareddata") {OXKXRCa  
HHOOK hHook =NULL; Akb#1Ww4  
UINT nHookCount =0; #kR8v[Z  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 8rx?mX,}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ,-rOfk\u  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey m+?$cyA>v  
static int KeyCount =0; 1}%vZE2  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift [z5pqd-  
#pragma data_seg() x9hkE!{8  
HINSTANCE hins; o cotO  
void VerifyWindow(); 5RrzRAxq  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) { r yv7G  
//{{AFX_MSG_MAP(CHookApp) &"p7X>bd  
// NOTE - the ClassWizard will add and remove mapping macros here. >ZTRwy`_(  
// DO NOT EDIT what you see in these blocks of generated code! XJ^dX]4  
//}}AFX_MSG_MAP D C{l.a.  
END_MESSAGE_MAP() b MZ-{<+i  
]4^9Tw6 _b  
CHookApp::CHookApp() ds}:t.3}6  
{ ]+u`E  
 // TODO: add construction code here, lZCTthr\  
 // Place all significant initialization in InitInstance 2_'{f1bVxz  
} U%.OH?;f  
*UJ.cQ}  
CHookApp theApp; r#M0X^4A  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Y@)/iwq  
{ 0hVw=KDO9:  
 BOOL bProcessed=FALSE; outAZy=R;  
 if(HC_ACTION==nCode) Q`j!$r  
 { 0<d9al|J  
  if((lParam&0xc0000000)==0xc0000000){// Key up e%Rg,dX  
   switch(wParam) OuWG.Za  
   { ]q~ _  
    case VK_MENU: G6]W'Kk  
     MaskBits&=~ALTBIT; pN|BtrN{  
     break; =4+Wx8ZeW  
    case VK_CONTROL: :08b&myx  
     MaskBits&=~CTRLBIT; #;4<dDVy  
     break; D"UCe7  
    case VK_SHIFT: [CTE"@A  
     MaskBits&=~SHIFTBIT; 2#%@j6  
     break; >1q W*  
    default: //judge the key and send message 'M8wjU  
     break; xn|M]E1)  
   } "ld4v+o8l  
   for(int index=0;index<MAX_KEY;index++){ 9ozN$:  
    if(hCallWnd[index]==NULL) F6^Xi"R[  
     continue; _=!R l#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]06orBV  
    { uJhB>/Og  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); " iAwD8-  
     bProcessed=TRUE; }22h)){n#Y  
    } V9  Z  
   } 90<z*j$EK  
  } 2%o@?Rp  
  else if((lParam&0xc000ffff)==1){ //Key down h \dq]yOl  
   switch(wParam) lrrNyaFn  
   { 3msb"|DG  
    case VK_MENU: as%@dUK?  
     MaskBits|=ALTBIT; Vcjmj  
     break; r I)Y W0  
    case VK_CONTROL: E "9`  
     MaskBits|=CTRLBIT; TC[(mf:8  
     break; "Bn8WT2?  
    case VK_SHIFT: G)5R iRcs  
     MaskBits|=SHIFTBIT; rnX D(  
     break; dA4DW  
    default: //judge the key and send message &/wd_;d^A  
     break; Dfz3\|LJ  
   } /<zBjvr%%  
   for(int index=0;index<MAX_KEY;index++) 9=RfGx  
   { Q1hHK'3w  
    if(hCallWnd[index]==NULL) +8p4\l$<`  
     continue; p SMF1Oy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aq.Lnbi/X  
    { Iv>4o~t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); E~c>LF_]Q  
     bProcessed=TRUE; ""_%u'7t5I  
    } Z WhV"]w&  
   } l9F]Lw  
  } zdN(r<m9"  
  if(!bProcessed){ V7,;N@FL  
   for(int index=0;index<MAX_KEY;index++){ w\5;;9_#  
    if(hCallWnd[index]==NULL) 9S<at MB  
     continue; !<4=@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) SG-Xgr@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); h`V#)Q  
   } i0{sE  
  } b|u0a6  
 } q,.@<sW  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); d0G d5%  
} T1YbF/M'  
KO=H!Em\l  
BOOL InitHotkey() Kbqx)E$iL  
{ D+CP?} /  
 if(hHook!=NULL){ b%UbTb,  
  nHookCount++; 2NZC,znQ  
  return TRUE; #CNK [y  
 } jmn<gJ2Of  
 else #;s5=aH  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); pLsWy&G  
  if(hHook!=NULL) pXoT@[}  
   nHookCount++; n_P2l<F~/x  
  return (hHook!=NULL); I_iXu;UX  
} t@3y9U$  
BOOL UnInit() KDJ-IXoU  
{ fH ?s~X]  
 if(nHookCount>1){  [?moS!  
  nHookCount--; Kb*X2#;*  
  return TRUE; A%% Vyz  
 } ZRj&k9D^U  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Pfl8x  
 if(unhooked==TRUE){ ,g{Ob{qT  
  nHookCount=0; 1 ac;6`  
  hHook=NULL; G q2@37U  
 } i'uSu8$'*  
 return unhooked; vALH!Kh  
} L31#v$;4  
x\'95qU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #A9rI;"XI  
{ oO&R3zA1d  
 BOOL bAdded=FALSE; L IRdWGQ4  
 for(int index=0;index<MAX_KEY;index++){ jLF,R7t  
  if(hCallWnd[index]==0){ iJ!p9E*(  
   hCallWnd[index]=hWnd; k/2TvEV3=  
   HotKey[index]=cKey; -=a,FDeR  
   HotKeyMask[index]=cMask; L3'$"L.|u  
   bAdded=TRUE; Xx e07J~  
   KeyCount++; 3 cF4xUIZ  
   break; !A&>Eeai  
  } T6I$7F  
 } raB', Vp  
 return bAdded; +`l)W`zX  
} 2HF_kYZ  
Y3?)*kz%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) whh#J (  
{ @Avve8S  
 BOOL bRemoved=FALSE; d3tr9B  
 for(int index=0;index<MAX_KEY;index++){ @$!rgLyL[  
  if(hCallWnd[index]==hWnd){ -~WDv[ [  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ o ^Ro 54i  
    hCallWnd[index]=NULL; ,HtX D~N  
    HotKey[index]=0; 3D2i32Y@!  
    HotKeyMask[index]=0; 8 ;"HM5+  
    bRemoved=TRUE; YzeNr*  
    KeyCount--; ID8u&:  
    break; U\x $@J  
   } 6QG"~>v7'(  
  } Ula h!s  
 } *8I &|)x  
 return bRemoved; 8Ao pI3  
} W|AK"vf  
GVld]ioycG  
void VerifyWindow() agp7zw=N  
{ EdC/]  
 for(int i=0;i<MAX_KEY;i++){ V&Q_i E  
  if(hCallWnd!=NULL){ (svKq(X  
   if(!IsWindow(hCallWnd)){ vMeB2r<  
    hCallWnd=NULL; r!y3VmJ'm  
    HotKey=0; <7Ry"z6g;  
    HotKeyMask=0; /#g P#Z%  
    KeyCount--; B*AB@  
   } Q^?$2ck=  
  } Z 8GIZ  
 } GW%!?mJ  
} XSx'@ qH  
0$U\H>r  
BOOL CHookApp::InitInstance()  x_/H  
{ 2_Cp}Pj  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); v^[!NygShs  
 hins=AfxGetInstanceHandle(); *0r!eD   
 InitHotkey(); HPo><u  
 return CWinApp::InitInstance(); 4]Gm4zO  
} -; i:bE  
<YCR^?hJSi  
int CHookApp::ExitInstance() i=fhK~Jd  
{ )]m4FC:  
 VerifyWindow(); Uf?+oc'{  
 UnInit(); 87KSV"IU8  
 return CWinApp::ExitInstance(); :cP u  
} 6QPT  
B>cx[.#!  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \D#+0  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) >: J1Gc  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ EFu>  
#if _MSC_VER > 1000 l9H-N*Wx  
#pragma once X6?Gxf,  
#endif // _MSC_VER > 1000 yDpv+6(a  
9R&.$5[W(s  
class CCaptureDlg : public CDialog B\;fC's+  
{ ax 2#XSCO  
 // Construction ?~]mOv>  
 public: A!$sO p  
  BOOL bTray; j1ap,<\.k  
  BOOL bRegistered; =H}}dC<)  
  BOOL RegisterHotkey(); YC*`n3D|'  
  UCHAR cKey; !Uhcjfq`e  
  UCHAR cMask; X-j<fX_  
  void DeleteIcon(); M?['HoRo  
  void AddIcon(); s(MdjWw  
  UINT nCount; 90H/Txq  
  void SaveBmp(); ;BHIss7  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor E6-~  
  // Dialog Data &G3$q,`H  
  //{{AFX_DATA(CCaptureDlg) }UG<_ bE|  
  enum { IDD = IDD_CAPTURE_DIALOG }; (YYwn@NGj  
  CComboBox m_Key; KT<N ;[;  
  BOOL m_bControl; ItAC=/(d  
  BOOL m_bAlt; ;\T~Hc}&;  
  BOOL m_bShift; u(`7F(R  
  CString m_Path; e.!~7c_z?  
  CString m_Number; W,nn,%  
  //}}AFX_DATA h{?f uoZj%  
  // ClassWizard generated virtual function overrides 4k6:   
  //{{AFX_VIRTUAL(CCaptureDlg) qJXf c||Zg  
 public: |CBJ8],mT  
  virtual BOOL PreTranslateMessage(MSG* pMsg); KF`mOSP  
 protected: hm1.UE  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;*20b@  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~AF' 6"A  
  //}}AFX_VIRTUAL grJ(z)c  
  // Implementation w&&)v~Y_  
 protected: .O{_^~w_q  
  HICON m_hIcon; @DAaCF8  
  // Generated message map functions L|A1bxt  
  //{{AFX_MSG(CCaptureDlg) K-@cn*6  
  virtual BOOL OnInitDialog(); /j\.~=,_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ` ^z l =  
  afx_msg void OnPaint(); of`WP  
  afx_msg HCURSOR OnQueryDragIcon(); 3BB/u%N}  
  virtual void OnCancel(); Q:Y`^jP   
  afx_msg void OnAbout(); op_ 1J;RF  
  afx_msg void OnBrowse(); 3tmS/ tQp  
  afx_msg void OnChange(); GbC JGqOR  
 //}}AFX_MSG }5QUIK~NA  
 DECLARE_MESSAGE_MAP() \F7NuG:m,  
}; W:2j.K9!  
#endif pJQ_G`E  
3E8 Gh>J_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file pq]>Ep  
#include "stdafx.h" 9}d^ll&  
#include "Capture.h" TZObjSm_v  
#include "CaptureDlg.h" lhF)$M  
#include <windowsx.h> Js9 EsN%  
#pragma comment(lib,"hook.lib") _wZr`E)  
#ifdef _DEBUG Wtflw>-  
#define new DEBUG_NEW Q1DiEg  
#undef THIS_FILE IXR%IggJA  
static char THIS_FILE[] = __FILE__; jZq CM{  
#endif \YH*x`  
#define IDM_SHELL WM_USER+1 w|ct="MG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F[0w*i&u5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z+nq<%"'  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hOm0ND?;1  
class CAboutDlg : public CDialog YUlH5rO3  
{ v=YI%{tx)  
 public: Gn% k#  
  CAboutDlg(); XeAH.i<  
  // Dialog Data rX|{nb  
  //{{AFX_DATA(CAboutDlg) Ys@\~?ym+  
  enum { IDD = IDD_ABOUTBOX }; e~$aJO@B.R  
  //}}AFX_DATA 0-Wv$o[  
  // ClassWizard generated virtual function overrides j<A; i  
  //{{AFX_VIRTUAL(CAboutDlg) +?0r%R%\  
 protected: .gw6W0\F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8oP"?ew#  
  //}}AFX_VIRTUAL x\5\KGw16  
  // Implementation QV=|' S  
 protected: t\-;n:p-  
  //{{AFX_MSG(CAboutDlg) sTECNY=l  
  //}}AFX_MSG Z7dVy8J  
  DECLARE_MESSAGE_MAP() )oMMDH w\  
}; M`|E)Y  
D (Q=EdlO  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )AAPT7!U  
{ Odbm"Y  
 //{{AFX_DATA_INIT(CAboutDlg) dca?(B!'6  
 //}}AFX_DATA_INIT ,)t/1oQ}>^  
} l'"Ici#7Ls  
ztV%W6  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ^FK-e;J  
{ EA<x$O  
 CDialog::DoDataExchange(pDX); HhB' ^)  
 //{{AFX_DATA_MAP(CAboutDlg) w?M` gl8r  
 //}}AFX_DATA_MAP >jm^MS=  
} x)e(g}n  
U5H5QW+  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) qmbhx9V   
 //{{AFX_MSG_MAP(CAboutDlg) oMF[<Xf  
 // No message handlers PkDh[i9Z|  
 //}}AFX_MSG_MAP |`@7G`x  
END_MESSAGE_MAP() \l/<[ZZ  
+Pb@@C&  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) l gTw>r   
: CDialog(CCaptureDlg::IDD, pParent) n`|CD Kb  
{ Kl*/{&,P  
 //{{AFX_DATA_INIT(CCaptureDlg) WVh]<?GWXk  
  m_bControl = FALSE; tL S$D-  
  m_bAlt = FALSE; ZrDr/Q~  
  m_bShift = FALSE; A55F* d  
  m_Path = _T("c:\\"); F3<Ip~K  
  m_Number = _T("0 picture captured."); 7^Y`'~Y^  
  nCount=0; }j|YX&`p  
  bRegistered=FALSE; DMd&9EsRG  
  bTray=FALSE; pt9fOih[  
 //}}AFX_DATA_INIT =tqChw   
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 V%n7 h&\%  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~|=G3( I[  
} 6i*LP(n  
`5t CmU  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 3aEO9v,n  
{ QZ_8r#2x  
 CDialog::DoDataExchange(pDX); ag"Nf-o/Y  
 //{{AFX_DATA_MAP(CCaptureDlg) $WZHkV  
  DDX_Control(pDX, IDC_KEY, m_Key); Z`{GjV3%wH  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Y q-7!  
  DDX_Check(pDX, IDC_ALT, m_bAlt); )F%zT[Auph  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Cg%}=  
  DDX_Text(pDX, IDC_PATH, m_Path); DV jsz  
  DDX_Text(pDX, IDC_NUMBER, m_Number); >S HW  
 //}}AFX_DATA_MAP 8fQaMn4V  
} 3b1%^@,ACy  
p|'Rm ]&jb  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) pL{:8Ed  
//{{AFX_MSG_MAP(CCaptureDlg) 5s1XO*s)>X  
 ON_WM_SYSCOMMAND() oJVpJA0IA  
 ON_WM_PAINT() t3;QF  
 ON_WM_QUERYDRAGICON() Hp-vBoEk  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) hrTl:\  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) @z7$1pl}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .jbT+hhM  
//}}AFX_MSG_MAP r[RO"Ej"  
END_MESSAGE_MAP() ]YwvwmZ  
.7MLgC;  
BOOL CCaptureDlg::OnInitDialog() NLO&.Q]#  
{ MGSD;Lgn  
 CDialog::OnInitDialog(); +&8'@v$  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 1Et{lrgh f  
 ASSERT(IDM_ABOUTBOX < 0xF000); Xa/]} B  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 6YYDp&nqEj  
 if (pSysMenu != NULL) 9l:vVp7Uk  
 { 9c=`Q5  
  CString strAboutMenu; %scQP{%aD  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 'V(9ein^Q  
  if (!strAboutMenu.IsEmpty()) GQ= Pkko  
  { 8Z(\iZ5Rgj  
   pSysMenu->AppendMenu(MF_SEPARATOR); $C9['GGR  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); D 13bQ&\B-  
  } 5:X^Q.f;  
 } )TyI~5>;  
 SetIcon(m_hIcon, TRUE); // Set big icon |FJc'&)J"  
 SetIcon(m_hIcon, FALSE); // Set small icon !jyy`q=  
 m_Key.SetCurSel(0); Rln@9muXA  
 RegisterHotkey(); U&SgB[QHO  
 CMenu* pMenu=GetSystemMenu(FALSE); )VFS&|#\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); u_X(c'aE;  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =fy'w3m  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); d/xGo[?$  
 return TRUE; // return TRUE unless you set the focus to a control !eGUiE=  
} Ihg1%.^V\  
y_N h5  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) s f<NC>-  
{ Cc!LJ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %pr}Xs(-f  
 { g2W ZW#a)  
  CAboutDlg dlgAbout; wTPHc:2  
  dlgAbout.DoModal(); #]FJx  
 } OK=ANQjs(  
 else .vhEm6wJUM  
 { zc%HBZ3p  
  CDialog::OnSysCommand(nID, lParam); F`JW&r\  
 } qJT|om L Y  
} u4.2u}A/R%  
}R2afTn[;  
void CCaptureDlg::OnPaint() #tlhH\Pr[  
{ q;H5S<]/  
 if (IsIconic()) }X^CH2,R  
 { O (YvE  
  CPaintDC dc(this); // device context for painting @[w.!GW%  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); glgXSOj  
  // Center icon in client rectangle yu @u0vlc  
  int cxIcon = GetSystemMetrics(SM_CXICON); 5{O9<~,  
  int cyIcon = GetSystemMetrics(SM_CYICON); spv'r!*\ed  
  CRect rect; +]jJ:V  
  GetClientRect(&rect); 4+4C0/$Y  
  int x = (rect.Width() - cxIcon + 1) / 2; 7DCu#Y[  
  int y = (rect.Height() - cyIcon + 1) / 2; WS1$cAD2N  
  // Draw the icon x$/: %"E  
  dc.DrawIcon(x, y, m_hIcon); k{w  
 } QKtVwsz +  
 else V.Qy4u7m  
 { Xo~kB)|,  
  CDialog::OnPaint(); pQ9~^  
 } ^fxS=Qs+  
} X(fT[A_2C  
#xBh62yIuP  
HCURSOR CCaptureDlg::OnQueryDragIcon() j=5hW.fI  
{ r"\g6<RP  
 return (HCURSOR) m_hIcon; ] R-<v&O  
} mqk tM6  
V.^Z)iNf^  
void CCaptureDlg::OnCancel() uPQrDr5  
{ h&j9'  
 if(bTray) _5&LV2  
  DeleteIcon(); CGY,I UG  
  CDialog::OnCancel(); X w_6SR9C  
} f5dctDHP  
gq[`g=x  
void CCaptureDlg::OnAbout() _yP02a^2  
{ sTChbks  
 CAboutDlg dlg; 8PtX@s43\  
 dlg.DoModal(); 6V^KOG  
} oES4X{,  
ST7Xgma-  
void CCaptureDlg::OnBrowse() Z|IFT1K  
{ o]O  
 CString str; sm96Ye{O{  
 BROWSEINFO bi; jhkNi`E7  
 char name[MAX_PATH]; +3%i7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )*T <s  
 bi.hwndOwner=GetSafeHwnd(); ?Y | *EH  
 bi.pszDisplayName=name; C:$pAE(  
 bi.lpszTitle="Select folder"; JDj^7\`  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; $3D#U^7i  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Bn?MlG;aA  
 if(idl==NULL) AB")aX2% E  
  return; $G@^!(  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 71inHg  
 str.ReleaseBuffer(); "R9^X3;  
 m_Path=str; {u_2L_  
 if(str.GetAt(str.GetLength()-1)!='\\') 19# A7  
  m_Path+="\\"; XbMAcgS  
 UpdateData(FALSE); 8@J5tFJ&%  
} >S=,ype~G  
9d1 G u"  
void CCaptureDlg::SaveBmp() 7UA|G2Zr  
{ j3yz"-53e  
 CDC dc; bf&k:.v'8  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); c`x[C  
 CBitmap bm; /!HFi>   
 int Width=GetSystemMetrics(SM_CXSCREEN); \B1<fF2  
 int Height=GetSystemMetrics(SM_CYSCREEN); IWD21lS  
 bm.CreateCompatibleBitmap(&dc,Width,Height); TVEFZ\p<A  
 CDC tdc; Jk3V]u  
 tdc.CreateCompatibleDC(&dc); !-Br?  
 CBitmap*pOld=tdc.SelectObject(&bm); j~VHU89  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); KuohUH+  
 tdc.SelectObject(pOld); .,7ZD O9{  
 BITMAP btm; tpP2dg9dF  
 bm.GetBitmap(&btm); {_<,5)c  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; r(uf yC&  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); e lzKtVw  
 BITMAPINFOHEADER bih; 2-!n+#Cdf  
 bih.biBitCount=btm.bmBitsPixel; Z4aK   
 bih.biClrImportant=0; ;?'=*+'>  
 bih.biClrUsed=0; oYNp0Hc  
 bih.biCompression=0; H]JVv8  
 bih.biHeight=btm.bmHeight; #Y'svn1H  
 bih.biPlanes=1; 2*1FW v  
 bih.biSize=sizeof(BITMAPINFOHEADER); {%Ujp9i  
 bih.biSizeImage=size; sg!* %*XQ  
 bih.biWidth=btm.bmWidth; LJII7<k  
 bih.biXPelsPerMeter=0; gdVajOAu  
 bih.biYPelsPerMeter=0; GtNGrJU  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;V"(! 'd  
 static int filecount=0; J 8""}7D  
 CString name; .ugQH<B  
 name.Format("pict%04d.bmp",filecount++); Yt% E,U~g  
 name=m_Path+name; ZUxlk+o9d  
 BITMAPFILEHEADER bfh; !ii'hwFm$  
 bfh.bfReserved1=bfh.bfReserved2=0; oHI/tS4 _  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ]p sx\ZMa  
 bfh.bfSize=54+size; ^vH3 -A;*  
 bfh.bfOffBits=54; ? (f44Zgm  
 CFile bf; j*05!j<'  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )ls<"WTC.  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )TFBb\f>v  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Q0cr^24/  
  bf.WriteHuge(lpData,size); u]%>=N(^2  
  bf.Close(); A}cGag+sp  
  nCount++; 7 /$s!pV  
 } Md4JaFA(  
 GlobalFreePtr(lpData); '5n67Hl 1  
 if(nCount==1) (xhwl=MX)  
  m_Number.Format("%d picture captured.",nCount); :5M7*s)e16  
 else xHMbtY  
  m_Number.Format("%d pictures captured.",nCount); u/8urxp y  
  UpdateData(FALSE); lC&B4zec  
} ;uazQyo6  
t%f6P  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) wWNHZ v&  
{ l[J'FR:  
 if(pMsg -> message == WM_KEYDOWN) z nc'  
 { T)NnWEB  
  if(pMsg -> wParam == VK_ESCAPE) "RF<i3{S  
   return TRUE; j7M[]/|  
  if(pMsg -> wParam == VK_RETURN) *1 [v08?!  
   return TRUE; `/z6 Q"  
 } <_tkd3t#W  
 return CDialog::PreTranslateMessage(pMsg); 7~V,=WEe  
}  MXj7Z3  
rHWlv\+N n  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) pwvcH3l/r  
{ '~ {xn  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ < <vE.  
  SaveBmp(); 01nbR+e  
  return FALSE; "7k 82dw  
} ~e!b81  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 02~+$R]L  
 CMenu pop; ZAG ia q  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); JM@}+pX  
 CMenu*pMenu=pop.GetSubMenu(0); Vp'Zm:  
 pMenu->SetDefaultItem(ID_EXITICON); 9O+><x[i  
 CPoint pt; 7.o:(P1??g  
 GetCursorPos(&pt); R]7-6  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 6O>GVJbw  
 if(id==ID_EXITICON) fiq4|!^h  
  DeleteIcon(); ]OZk+DU:  
 else if(id==ID_EXIT) .kO;9z\B  
  OnCancel(); ~Zc=FP:1  
 return FALSE; s2{d<0x?v  
} -U?Udmov  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `KgWaf-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Y70[Nz  
 AddIcon(); bJo)rM :m  
 return res; xnW3,:0  
} \p-3P)U  
|@x^5Ab$T  
void CCaptureDlg::AddIcon() 0 7CufoI  
{ |-HV@c]  
 NOTIFYICONDATA data; {1Z`'.FU  
 data.cbSize=sizeof(NOTIFYICONDATA); YFVNkB O%  
 CString tip; R N1q/H|  
 tip.LoadString(IDS_ICONTIP); Bw31h3yB  
 data.hIcon=GetIcon(0); rSUarfZ<  
 data.hWnd=GetSafeHwnd(); GN4'LU  
 strcpy(data.szTip,tip); 3f2%+2Zjt,  
 data.uCallbackMessage=IDM_SHELL; A?V[/  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <#s=78 g.3  
 data.uID=98; 1 XAXokxj  
 Shell_NotifyIcon(NIM_ADD,&data); Gyak?.@R  
 ShowWindow(SW_HIDE); :K ^T@F5n  
 bTray=TRUE; =7JvS~s  
} s0 ZF+6f  
J2$L[d^  
void CCaptureDlg::DeleteIcon() +P?!yH,n  
{ >[=fbL@N<@  
 NOTIFYICONDATA data; ^ 2"r't  
 data.cbSize=sizeof(NOTIFYICONDATA); nVF?.c  
 data.hWnd=GetSafeHwnd(); Dk!;s8}*c  
 data.uID=98; +mQMzZZTZ  
 Shell_NotifyIcon(NIM_DELETE,&data); 9y(75Bn9  
 ShowWindow(SW_SHOW); :Rh?#yO 5  
 SetForegroundWindow(); p`jkyi  
 ShowWindow(SW_SHOWNORMAL); bqHR~4 #IR  
 bTray=FALSE; 2g elmQnc  
} FC:Z9{2!  
B&~#.<23:  
void CCaptureDlg::OnChange()  R\%&Q|  
{ 2nW:|*:/p6  
 RegisterHotkey(); 3[g%T2&[  
} S <C'#vj  
(j^Qa~{mG4  
BOOL CCaptureDlg::RegisterHotkey() 4aAuE0  
{ d`he Wv^/`  
 UpdateData(); Jhclg0q  
 UCHAR mask=0; j {w'#x,  
 UCHAR key=0; B>&Q]J+R  
 if(m_bControl) hjVct r  
  mask|=4; GJ:65)KU  
 if(m_bAlt) ^tS{a*Yn  
  mask|=2; Z*EK56.b  
 if(m_bShift) VQ5D?^'0/  
  mask|=1; \Kp!G1?_AY  
  key=Key_Table[m_Key.GetCurSel()]; lWr{v\L'  
 if(bRegistered){ $TON`+lB  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); [Bn C_^[W  
  bRegistered=FALSE; ^ lrq`1k  
 } (!72Eaw:]  
 cMask=mask; .E'Tfa  
 cKey=key; CdCo+U5z{  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); B{UL(6\B  
 return bRegistered; sb Wn1 T U  
} 9`P<|(  
G%{J.J41F  
  四、小结  |,*N>e  
:+%"kgJNL  
  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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