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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: O4]Ss}ol  
  5NJ@mm{0  
  一、实现方法 E36<Wog  
ugVsp&i#  
  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: !xj>~7  
ZH0 ~:  
#pragma data_seg("shareddata") " &p\pR~  
HHOOK hHook =NULL; //钩子句柄 i*.Z~$  
UINT nHookCount =0; //挂接的程序数目 LL9I:^  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 8%arA"#S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 \ 8ulX>]  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey EpOVrk  
static int KeyCount =0; M}(4>W  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 QTcngv[  
#pragma data_seg() ;9,Ll%Lk<  
?9mWMf%t  
  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。 &y3_>!L  
4) /tCv  
  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: @ U}fvdft  
]L}<Y9)t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR a[lE9JA;|  
cKey,UCHAR cMask) F] M3/M  
{ &e cf5jFy  
 BOOL bAdded=FALSE; Y5c( U)R8  
 for(int index=0;index<MAX_KEY;index++){ ds5<4SLj  
  if(hCallWnd[index]==0){ -S)HB$8  
   hCallWnd[index]=hWnd; n." j0kc7=  
   HotKey[index]=cKey; S9U9;>g  
   HotKeyMask[index]=cMask; }gag?yQ.^  
   bAdded=TRUE; 6&.[ :IHw  
   KeyCount++; OWtN=Gk  
   break; *M"lUw#(f  
  } <ywxz1i  
 } TD!QqLW  
 return bAdded; r}"T y  
} xV}|G   
//删除热键 WVJN6YNd V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @zsr.d6Q  
{ c6BaC@2  
 BOOL bRemoved=FALSE; *5*d8;@>  
 for(int index=0;index<MAX_KEY;index++){ FZj tQ{M  
  if(hCallWnd[index]==hWnd){ yK{;72  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p1J%=  
    hCallWnd[index]=NULL; J[VQ6fD%  
    HotKey[index]=0; |\~cjPX(  
    HotKeyMask[index]=0; dRWp/3 }  
    bRemoved=TRUE; $sGX%u  
    KeyCount--; ?y ]3kU  
    break; *!C^L"i  
   } +qzsC/y  
  }  M"X/([G  
 } "=P@x|I  
 return bRemoved; N{|N_}X`Y  
} dgX0\lKpf  
VdVca1Z  
1G{$ B^ f  
  DLL中的钩子函数如下: j%[|XfM  
m"H9C-Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Xa9G;J$  
{ pBK[j ([  
 BOOL bProcessed=FALSE; f{* G%  
 if(HC_ACTION==nCode) 7F)HAbIS  
 { -bZ^A~<O,  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 |Vd)7/LN  
   switch(wParam) f\^FUJy  
   {  Nl;rg*@o  
    case VK_MENU: Nm#KHA='Z  
     MaskBits&=~ALTBIT; *( D_g!a  
     break; CFRo>G  
    case VK_CONTROL: 9)l[$X  
     MaskBits&=~CTRLBIT; >qcir~ &  
     break; iCc@N|~  
    case VK_SHIFT: PS(LD4mD  
     MaskBits&=~SHIFTBIT; xU67ztS'E'  
     break; @-!w,$F)%d  
    default: //judge the key and send message 2)4{  
     break; q SCt= eQ  
   } JK[7&C-O  
   for(int index=0;index<MAX_KEY;index++){ t?YGGu^  
    if(hCallWnd[index]==NULL) olK%TM[Y  
     continue; .hETqE`E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3<'SnP3mY  
    { KY2xKco  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !{Y$5)Xh`]  
     bProcessed=TRUE; |_!xA/_U'T  
    } )|Y"^K%Jm  
   } 7CrWsQl u  
  } ==UH)o`?8  
  else if((lParam&0xc000ffff)==1){ //有键按下 2&Wc4,O!i  
   switch(wParam) qI5/ME(}  
   { s- g[B(  
    case VK_MENU: W!GgtQw{F  
     MaskBits|=ALTBIT; sx*(JM}Be  
     break; s {$c8  
    case VK_CONTROL: iFS ?nZ~.  
     MaskBits|=CTRLBIT; o*5|W9  
     break; 0r:8ni%cL  
    case VK_SHIFT: Bv3?WW  
     MaskBits|=SHIFTBIT; NpH)K:$#%  
     break; QFDjsd4  
    default: //judge the key and send message N:"E%:wSbi  
     break; qC`"<R=GX  
   } 78}iNGf  
   for(int index=0;index<MAX_KEY;index++){ 7<-D_$SrU  
    if(hCallWnd[index]==NULL) b$.N8W%  
     continue; Z#"6&kv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .`xcR]PQ  
    { >q[Elz=dI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X$PT-~!a  
     bProcessed=TRUE; u8-)LOf(  
    } <t]i' D(K  
   } B6$s*SXNp  
  } ]yCmGt+b  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 pS0-<-\R  
   for(int index=0;index<MAX_KEY;index++){ hvZW~ =75  
    if(hCallWnd[index]==NULL) GW.s\8w  
     continue; Q$V xm+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) eT:%i"C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Gh42qar`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 s)xfTr_$  
   } cZ^$!0  
  } +w GE  
 } 0+cRUH9Ew  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]O&TU X@)  
} GD~3RnGQ{  
hMi!H.EX.  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: f-4<W0%  
ad i5h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s~M!yuH  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t2tH%%Rs  
s+Ln>c'|o  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: B>AIec\jG  
`^ F'af  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f,`FbT  
{ 3cQTl5,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) v|QFUa`  
 { Tje =vI  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 VY~WkSi[<  
  SaveBmp(); 4lvo9R  
  return FALSE; }_5z(7}3  
 } 'fawpU|h  
 …… //其它处理及默认处理 Es[?yft2Q<  
} *R1x^t+)  
7d'4"c;*;  
X3X~`~bAD  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 V,|9$A;  
EUUj-.dEN  
  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。 kc/h]B  
<~X=6  
  二、编程步骤 M8S4D&vpD4  
fs>0{  
  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"; b\]"r x (  
Gash3}+  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; N|7<*\o  
HmRwh  
  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; OXA_E/F  
%#ms`"H  
  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; BniFEW:<  
YN"102CK  
  5、 添加代码,编译运行程序。 OkA-=M)RI:  
{TE0  
三、程序代码 .yg"!X  
,MOB+i(3*u  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL |FPx8b;#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) kD MS7y<s  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ( 9dV%#G\  
#if _MSC_VER > 1000 v`x~O+  
#pragma once ^/Gjk  
#endif // _MSC_VER > 1000 Mk,8v],-Tj  
#ifndef __AFXWIN_H__ Yg2z=&p-{"  
#error include 'stdafx.h' before including this file for PCH .B#Lt,m  
#endif C'7W50b  
#include "resource.h" // main symbols Z2*hQ`eE  
class CHookApp : public CWinApp wrGd40  
{ \+L_'*&8  
 public: J,m.LpY  
  CHookApp(); /x-Ja[kL  
  // Overrides :Q$3P+6a  
  // ClassWizard generated virtual function overrides f_.1)O'83  
  //{{AFX_VIRTUAL(CHookApp) gtjgC0   
 public: fa5($jJ&  
  virtual BOOL InitInstance(); hO{@!H$l  
  virtual int ExitInstance(); xH3SVn(I  
  //}}AFX_VIRTUAL  jCKRoao  
  //{{AFX_MSG(CHookApp) v`beql  
  // NOTE - the ClassWizard will add and remove member functions here. gY*Cl1 Iz  
  // DO NOT EDIT what you see in these blocks of generated code ! Ra~n:$tg2  
  //}}AFX_MSG >[ 72]<6  
  DECLARE_MESSAGE_MAP() 3^1)W!n/  
}; HzH_5kVW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); W,AIE 6F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zL)S,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); { H9pF2C  
BOOL InitHotkey(); CAc nH  
BOOL UnInit(); w[4SuD  
#endif O aF+Z@s  
0SvPyf%AC  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. !4.;Ftgjn  
#include "stdafx.h" )m5<gp`  
#include "hook.h" y<3v/ ,Y  
#include <windowsx.h> Vy-S9=  
#ifdef _DEBUG P]dDTh~e~  
#define new DEBUG_NEW uz'beE  
#undef THIS_FILE |W:kzTT-T  
static char THIS_FILE[] = __FILE__; ua7I K~8l  
#endif b;!ilBc  
#define MAX_KEY 100 S$muV9z2=  
#define CTRLBIT 0x04 *p.ELI1IC  
#define ALTBIT 0x02 :*c@6;2@  
#define SHIFTBIT 0x01 o#0NIn"GS/  
#pragma data_seg("shareddata") 5\QNGRu"  
HHOOK hHook =NULL; -@^SiI:C  
UINT nHookCount =0; &[RC4^;\V  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey fjp>FVv3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT vkbB~gr@*  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ;;l(  
static int KeyCount =0; .=^h@C*   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Mh3zl  
#pragma data_seg() B(^fM!_%-6  
HINSTANCE hins; ;]n U->  
void VerifyWindow(); @&E E/j^  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ]p0m6}B  
//{{AFX_MSG_MAP(CHookApp) 2px5>4<  
// NOTE - the ClassWizard will add and remove mapping macros here. \ 0<e#0-V  
// DO NOT EDIT what you see in these blocks of generated code! %$sWNn  
//}}AFX_MSG_MAP GIZNHG   
END_MESSAGE_MAP() /hI#6k8o_  
P?]q*KViM  
CHookApp::CHookApp() :I<%.|8  
{ 8eOQRC33  
 // TODO: add construction code here, (W@ ypK@  
 // Place all significant initialization in InitInstance [d dEt  
} lD C74g  
w2$HP/90j  
CHookApp theApp; ?kS5=&<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "OK(<x]3;>  
{ JZP2NB_xt  
 BOOL bProcessed=FALSE; - *yj[?6  
 if(HC_ACTION==nCode) Pfd FB  
 { *q8W;Wa L  
  if((lParam&0xc0000000)==0xc0000000){// Key up bdcuO)3  
   switch(wParam) 4S"K%2'O  
   { W"!nf  
    case VK_MENU: 06Uxd\E~  
     MaskBits&=~ALTBIT; K=06I  
     break; U35}0NT _  
    case VK_CONTROL: jh8%Xu]t  
     MaskBits&=~CTRLBIT; Eda sGCo  
     break; Saz+GQ G  
    case VK_SHIFT: ]/d2*#  
     MaskBits&=~SHIFTBIT; Th,2gX9  
     break; UI;!_C_  
    default: //judge the key and send message <w2Nh eM 3  
     break; |<BTK_R  
   } ?hDEFW9&^x  
   for(int index=0;index<MAX_KEY;index++){ k5}i^^.  
    if(hCallWnd[index]==NULL) qRB%G<H  
     continue; aG=Y 6j G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) VQo7 se1P  
    { 7c;59$2(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;\#u19  
     bProcessed=TRUE; QMfYM~o  
    } QAb[M\G  
   } ^OA}#k NTW  
  } *xLMs(gg  
  else if((lParam&0xc000ffff)==1){ //Key down zlFl{t  
   switch(wParam) Bq:@ [pCQ  
   { OWq~BZ{  
    case VK_MENU: `yC R.3+  
     MaskBits|=ALTBIT; eJy@N  
     break; \LM'KD pP_  
    case VK_CONTROL: 4>5%SzZT\3  
     MaskBits|=CTRLBIT; -,5g cD  
     break; K5 w22L^=+  
    case VK_SHIFT: %LVk%kz  
     MaskBits|=SHIFTBIT; v3]q2*`G#  
     break; E176O[(V=  
    default: //judge the key and send message d3n TJX  
     break; rp1 u  
   } IFv2S|  
   for(int index=0;index<MAX_KEY;index++) }#yRa Ip  
   { N8nyTPw  
    if(hCallWnd[index]==NULL) eY&UFe  
     continue; ~:+g+Mf~[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E+7S:B  
    { T>?sPq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 93'%aSDI%  
     bProcessed=TRUE; h+*  
    } hc[GpZcw,  
   } ~i  &K,  
  } Y%&6qt G  
  if(!bProcessed){ XriVHb  
   for(int index=0;index<MAX_KEY;index++){ H!45w;,I  
    if(hCallWnd[index]==NULL) ~$Mp>ZB2W  
     continue; 0kCUz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _k j51=  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); gV`:eNo*  
   } sO(Kpo9jq  
  } F;~ #\ X  
 } k)4|%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *dKA/.g  
} }xdI{E1 q)  
X=.+XP]  
BOOL InitHotkey() n*O/ X  
{ G&Cl:CtC  
 if(hHook!=NULL){ C ]r$   
  nHookCount++; j?&FK  
  return TRUE; oW/&X5  
 } xH' H! 8  
 else +Oyt   
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Pq_Il9  
  if(hHook!=NULL) 4Y)3<=kDG  
   nHookCount++; k| jC c  
  return (hHook!=NULL); sxsM%Gb?H  
} 5`z{A  
BOOL UnInit() ^|sQkufo  
{ 'Y&yt"cs  
 if(nHookCount>1){ OI`Lb\8pP  
  nHookCount--; awC&xVf  
  return TRUE; RcHyePuF)R  
 } 6,c,i;J_  
 BOOL unhooked = UnhookWindowsHookEx(hHook); v-Br)lLv  
 if(unhooked==TRUE){ }%jb/@~  
  nHookCount=0; <R !qOQI  
  hHook=NULL; Hh qx)u  
 } m&$H ?yXW>  
 return unhooked; Z-vzq;  
} ,,G0}N@7s  
|]`+@K,S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {fGi:b\[ 8  
{ sJ0y3)PQ  
 BOOL bAdded=FALSE; # =322bnO  
 for(int index=0;index<MAX_KEY;index++){ zD?$O7 |ZK  
  if(hCallWnd[index]==0){ \T[*|"RFZ  
   hCallWnd[index]=hWnd; chiQ+  
   HotKey[index]=cKey; Ar):D#D  
   HotKeyMask[index]=cMask; /Fv1Z=:r  
   bAdded=TRUE; zBoU;d%p>  
   KeyCount++; bMv9f J  
   break; 4wBCs0NIm  
  } =1esUO[nx  
 } qi)(\  
 return bAdded; c?opVbJB\  
} +"SBt}1  
Az.Y-O<$\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TVjY8L9'h  
{ [S<DdTY9hZ  
 BOOL bRemoved=FALSE; i;\i4MT  
 for(int index=0;index<MAX_KEY;index++){ Z,d/FC#y(  
  if(hCallWnd[index]==hWnd){ @*c+`5)_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ x[>A'.m@)  
    hCallWnd[index]=NULL; e EU :  
    HotKey[index]=0; Aa1 |{^$:L  
    HotKeyMask[index]=0; RL&*.r&  
    bRemoved=TRUE; Ne#nSx5,  
    KeyCount--; #~#_) \l'F  
    break; nxH$$}9  
   } 4 bJ3uIP#  
  } I&cb5j]C  
 } t^7R6y  
 return bRemoved; %WO;WxG8^  
} =LT({8  
F*NIs:3;  
void VerifyWindow() Dgkt-:S/T|  
{ d?S<h`{x   
 for(int i=0;i<MAX_KEY;i++){ 7C 4Njei"  
  if(hCallWnd!=NULL){ r[?rwc^  
   if(!IsWindow(hCallWnd)){ %`}Qkb/Lyh  
    hCallWnd=NULL; wIY#TBu  
    HotKey=0; `b] NB^/  
    HotKeyMask=0; oF*Y$OEu?c  
    KeyCount--; PDir?'  
   } / _cOg? o  
  } 9:kb0oBa?l  
 } 8F@6^9C  
} Tok"-$`N  
!?+3 jzG  
BOOL CHookApp::InitInstance() Lc.7:r  
{ ~ h:^Q  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^< E,aCy  
 hins=AfxGetInstanceHandle(); :]//{HF  
 InitHotkey(); dIf Jr}ih  
 return CWinApp::InitInstance(); t /47lYN)  
} ioviJ7N% O  
A2vOI8  
int CHookApp::ExitInstance() 2.NzB7c*CM  
{ r@!~l1$s`  
 VerifyWindow(); T2Vj &EA@  
 UnInit(); F_-yT[i  
 return CWinApp::ExitInstance(); %r>vZ/>a  
} @TH \hr]  
/vQ^>2X%  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file MDB}G '  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) W5x]bl#  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ QUe.vb^O  
#if _MSC_VER > 1000 &R8zuD`#  
#pragma once OE[/sv  
#endif // _MSC_VER > 1000 *%fOE;-?  
m83i6"!H  
class CCaptureDlg : public CDialog =_UPZ]  
{ KS| $_-7 u  
 // Construction Y0b.utR&  
 public: `Y[zF1$kz^  
  BOOL bTray; M9N|Ql  
  BOOL bRegistered; HK-?<$Yc  
  BOOL RegisterHotkey(); o?X\,}-s  
  UCHAR cKey; gr S,PKH  
  UCHAR cMask; UtWoSFZ'o!  
  void DeleteIcon(); -meKaQv  
  void AddIcon(); AX&1-U  
  UINT nCount; Z@h]dU5%a  
  void SaveBmp(); My[L3KTTp  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3!}#@<j  
  // Dialog Data i$F)h<OU+  
  //{{AFX_DATA(CCaptureDlg) $6J5yE  
  enum { IDD = IDD_CAPTURE_DIALOG }; 77 `/YE#M  
  CComboBox m_Key; k\%{1oRA  
  BOOL m_bControl; >?DrC/  
  BOOL m_bAlt; NKMB,b  
  BOOL m_bShift; wHY;Y-(ZT  
  CString m_Path; e)iVX<qb  
  CString m_Number; u.arkp  
  //}}AFX_DATA OC [a?#R1  
  // ClassWizard generated virtual function overrides HKh)T$IZM  
  //{{AFX_VIRTUAL(CCaptureDlg) pkT a^I  
 public: i@p?.%K{  
  virtual BOOL PreTranslateMessage(MSG* pMsg); d5i /:  
 protected: #F9$"L1Hg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xL!05du  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); jt]+(sx  
  //}}AFX_VIRTUAL vw!i)JO8M  
  // Implementation p1&d@PF&&  
 protected: "~Eo=R0O  
  HICON m_hIcon; |[: `izW  
  // Generated message map functions }8FP5Z'Cf%  
  //{{AFX_MSG(CCaptureDlg) xCQ<G{;C  
  virtual BOOL OnInitDialog(); :wF(([&4p!  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }W YY5L8^  
  afx_msg void OnPaint(); }tJ:-!*2  
  afx_msg HCURSOR OnQueryDragIcon(); bVVa5? HP  
  virtual void OnCancel(); ZWr\v!4  
  afx_msg void OnAbout(); @4Y>)wn&;  
  afx_msg void OnBrowse(); Z c"]Cv(  
  afx_msg void OnChange(); 7_{x '#7  
 //}}AFX_MSG 7.=u:PK7kM  
 DECLARE_MESSAGE_MAP() a;lCr|*  
}; `=\G>#p<T  
#endif ;j(xrPNb  
cis ~]x%  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $Qm;F% >  
#include "stdafx.h"  10DS  
#include "Capture.h" %d=-<EQ|&  
#include "CaptureDlg.h" )8vcg{b{d  
#include <windowsx.h> s_kI\w4(x1  
#pragma comment(lib,"hook.lib") M'g4alS  
#ifdef _DEBUG 6znm?s@~  
#define new DEBUG_NEW bc 0|tJc  
#undef THIS_FILE ~\Ynih  
static char THIS_FILE[] = __FILE__; &B3kzs  
#endif zL_X?UmV  
#define IDM_SHELL WM_USER+1 d~n+Ds)%F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rkzhN59;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0)84Z.k  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; .*,Zh2eXU  
class CAboutDlg : public CDialog ~fgv7=(!  
{ L%BWrmg  
 public: "zv+|_ZAfd  
  CAboutDlg(); $]hf2Yr(  
  // Dialog Data ))MP]j9 T  
  //{{AFX_DATA(CAboutDlg) fG.w;Aemv5  
  enum { IDD = IDD_ABOUTBOX }; NyGF57v[M  
  //}}AFX_DATA omY?`(=  
  // ClassWizard generated virtual function overrides D QZS%)  
  //{{AFX_VIRTUAL(CAboutDlg) |6uEf/*DX  
 protected: CZ0 {*K:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support > Euput\  
  //}}AFX_VIRTUAL 0~-+5V  
  // Implementation a'A0CQ  
 protected: (* 2"dd  
  //{{AFX_MSG(CAboutDlg) ;Lu}>.t  
  //}}AFX_MSG 9\"~G)  
  DECLARE_MESSAGE_MAP() 6 HEl1FK{@  
}; T^Z#x-Q  
!KF;Z|_(I  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) - Zw"o>  
{ 2R_k$kHl  
 //{{AFX_DATA_INIT(CAboutDlg) TS%cTh'ItH  
 //}}AFX_DATA_INIT hgh1G7A&  
} >,9t<p=Q  
5G2u(hx  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) q`{.2yV  
{ m+!%+S1  
 CDialog::DoDataExchange(pDX); $iB(N ZV  
 //{{AFX_DATA_MAP(CAboutDlg) !O.B,  
 //}}AFX_DATA_MAP T xN5K`q  
} (+ >n/I6  
7eq;dNB@gq  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) . XY'l  
 //{{AFX_MSG_MAP(CAboutDlg) $)uQ%/DH>  
 // No message handlers E+>;tLw3j  
 //}}AFX_MSG_MAP jALo;PDJ  
END_MESSAGE_MAP() Nd0Wt4=  
weDv[b5i  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }\irr9,  
: CDialog(CCaptureDlg::IDD, pParent) 5<S1,u5  
{ 6jnRC*!?  
 //{{AFX_DATA_INIT(CCaptureDlg) 2ru6 bIb;  
  m_bControl = FALSE; Ex Qld  
  m_bAlt = FALSE; j9qN!.~mM  
  m_bShift = FALSE; 9 V;m;sz  
  m_Path = _T("c:\\"); 00Rk%QV  
  m_Number = _T("0 picture captured."); xNONf4I:6J  
  nCount=0; 4C2 D wj  
  bRegistered=FALSE; WH/a#F  
  bTray=FALSE; ?^7~|?v  
 //}}AFX_DATA_INIT D~ {)\;w^!  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %:/;R_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 1"k +K~:  
} 0r@rXwz  
UC0 yrV  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #2dmki"~(  
{ ~q9RZ#g13J  
 CDialog::DoDataExchange(pDX); 4gZN~_AI<  
 //{{AFX_DATA_MAP(CCaptureDlg) T&h|sa(   
  DDX_Control(pDX, IDC_KEY, m_Key); 'R$~U?i8  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); FqiK}K.~/  
  DDX_Check(pDX, IDC_ALT, m_bAlt); jVA xa|S  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); <ImeZ'L7  
  DDX_Text(pDX, IDC_PATH, m_Path); c9& 8kq5  
  DDX_Text(pDX, IDC_NUMBER, m_Number); RXP"v-  
 //}}AFX_DATA_MAP 4x3`dvfp/  
} Z`f _e?  
HsXFglQ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ''(T3;^ +  
//{{AFX_MSG_MAP(CCaptureDlg) gi`ZFq@  
 ON_WM_SYSCOMMAND() +I')>6  
 ON_WM_PAINT() BU)4g[4  
 ON_WM_QUERYDRAGICON() JAn3  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6?`py}:  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) QR#,n@fE  
 ON_BN_CLICKED(ID_CHANGE, OnChange) (kSk bwu  
//}}AFX_MSG_MAP ;Rt,"W)  
END_MESSAGE_MAP() k4|YaGhf  
{Cd*y6lI  
BOOL CCaptureDlg::OnInitDialog() LO2sP"9  
{ < /}[x2w?]  
 CDialog::OnInitDialog(); .h6h&[TEU  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); iGp@P=;m  
 ASSERT(IDM_ABOUTBOX < 0xF000); FkS{Z s  
 CMenu* pSysMenu = GetSystemMenu(FALSE); B^OhL!*tI  
 if (pSysMenu != NULL) fGxa~Unx  
 { t]m#k%)  
  CString strAboutMenu; \0:l9;^4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &oR&NKk  
  if (!strAboutMenu.IsEmpty()) Qejzp/2  
  { yZ2,AR%  
   pSysMenu->AppendMenu(MF_SEPARATOR); w?R6$n`  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 4f1*?HX&  
  } ZE1#{u~[y  
 } 2{%BQq>C  
 SetIcon(m_hIcon, TRUE); // Set big icon W[vak F  
 SetIcon(m_hIcon, FALSE); // Set small icon ~vt8|OOo0  
 m_Key.SetCurSel(0); vu1:8j  
 RegisterHotkey(); f{vnZ|WD  
 CMenu* pMenu=GetSystemMenu(FALSE); c2i^dNp_  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); QTDI^ZeuF  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @Wv*`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); I7}[%(~Sf/  
 return TRUE; // return TRUE unless you set the focus to a control &2g1Oy~  
} HH]LvK  
5-sxTp  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .$r(":A#)  
{ S5XFYQ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) * 5j iC  
 { [[)HPHSQ  
  CAboutDlg dlgAbout; 2qEy"DKu  
  dlgAbout.DoModal();  mbd@4u  
 } "B\qp"N  
 else l^SKd  
 { `yf#(YP  
  CDialog::OnSysCommand(nID, lParam); } o=g)  
 } @hCGV'4  
} M^bujGD  
YS/DIH{9e  
void CCaptureDlg::OnPaint() <?I~ +  
{ LX3 5Lt  
 if (IsIconic()) S2Wxf>b t2  
 { 7N:,F9V<  
  CPaintDC dc(this); // device context for painting #-{4 Jx  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); UrtN3icph  
  // Center icon in client rectangle t#d~gBe?V  
  int cxIcon = GetSystemMetrics(SM_CXICON); hxv/285B  
  int cyIcon = GetSystemMetrics(SM_CYICON); u=4tW:W,  
  CRect rect; ge E7<"m%  
  GetClientRect(&rect); '91Ak,cWB  
  int x = (rect.Width() - cxIcon + 1) / 2; 9\dC8  
  int y = (rect.Height() - cyIcon + 1) / 2; _[.`QW~  
  // Draw the icon U>{z*D  
  dc.DrawIcon(x, y, m_hIcon); | 0&~fY  
 } *l5/q\D  
 else F &uU ,);  
 { @NNN&%  
  CDialog::OnPaint(); u6D>^qF}@'  
 } VbZZ=q=Kd  
} :*\JJ w  
=XqmFr;h  
HCURSOR CCaptureDlg::OnQueryDragIcon() 76hi@7a  
{ :lcoSJ  
 return (HCURSOR) m_hIcon; "eBpSV>nnQ  
} Y(-+>>j_  
tW 9vo-{+  
void CCaptureDlg::OnCancel() /Jo*O=Lpo  
{ k6$.pCH6  
 if(bTray) ;ASlsUE\)  
  DeleteIcon(); uRp-yu[nt%  
  CDialog::OnCancel(); **oN/5  
} "EA%!P:d,  
a*o=,!  
void CCaptureDlg::OnAbout() UD .$C  
{ b2ZKhS8  
 CAboutDlg dlg; k/*r2 C  
 dlg.DoModal(); g<tr |n  
} Y>IEB,w  
L-q.Q  
void CCaptureDlg::OnBrowse() -[G+*3Y{7  
{ Bl(we/r  
 CString str; w%`7,d u|  
 BROWSEINFO bi; Qxt ,@<IK  
 char name[MAX_PATH]; `Up3p24  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); $_NVy>\&  
 bi.hwndOwner=GetSafeHwnd(); tLLP2^_&  
 bi.pszDisplayName=name; pWeKN`  
 bi.lpszTitle="Select folder"; _O)~<Sk-*z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; QKe=/;  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); qL] !/}  
 if(idl==NULL) 2x t 8F  
  return; S\mh{#Lpk  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 1*#64Y5F  
 str.ReleaseBuffer(); qA5tMZ^w  
 m_Path=str; 3!#d&  
 if(str.GetAt(str.GetLength()-1)!='\\') 6=iz@C7r  
  m_Path+="\\"; r IY_1  
 UpdateData(FALSE); J](AJkGzK  
} 7RDfhKdb  
7mt;qn?n  
void CCaptureDlg::SaveBmp() #5=Yg5   
{ Fq9AO~z  
 CDC dc;  >.0B%  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); M"1}"ex#  
 CBitmap bm; }c$Zlb  
 int Width=GetSystemMetrics(SM_CXSCREEN); }c^`!9  
 int Height=GetSystemMetrics(SM_CYSCREEN); &pV'/  
 bm.CreateCompatibleBitmap(&dc,Width,Height); RlC|xj"l%  
 CDC tdc; O*X ]oX  
 tdc.CreateCompatibleDC(&dc); MoavA 3`  
 CBitmap*pOld=tdc.SelectObject(&bm); l jQru ^(u  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); KP%A0   
 tdc.SelectObject(pOld); >]s|'HTxF  
 BITMAP btm; QT&2&#Z  
 bm.GetBitmap(&btm); +q6/'ErN]m  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; A+_361KH  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); %?^IS&]Z  
 BITMAPINFOHEADER bih; X`ee}C.D_  
 bih.biBitCount=btm.bmBitsPixel; Jzo|$W  
 bih.biClrImportant=0; (~#{{Ja  
 bih.biClrUsed=0; t*iKkV^aE  
 bih.biCompression=0; B!4chxzUZ  
 bih.biHeight=btm.bmHeight; ( hp 52Vse  
 bih.biPlanes=1; UBLr|e>dQE  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]oUvC  
 bih.biSizeImage=size; r ".*l?=  
 bih.biWidth=btm.bmWidth; Rq|7$O5  
 bih.biXPelsPerMeter=0; A_i=hj 2f  
 bih.biYPelsPerMeter=0; i]Njn k  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); scT,yNV  
 static int filecount=0; $qV, z  
 CString name; V9mqJRFJ:  
 name.Format("pict%04d.bmp",filecount++); \C#X Kk$OE  
 name=m_Path+name; \QGh@AQp"  
 BITMAPFILEHEADER bfh; Y{ijSOl3  
 bfh.bfReserved1=bfh.bfReserved2=0; )[oegfnn-  
 bfh.bfType=((WORD)('M'<< 8)|'B'); N2#Wyt8MC  
 bfh.bfSize=54+size; 5<^ $9('  
 bfh.bfOffBits=54; C8W#$a  
 CFile bf; 2<q>]G-nN  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =^\yE"a  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); B<zoa=  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); >g+yw1nC  
  bf.WriteHuge(lpData,size); ~4fUaMT  
  bf.Close(); ;SnpD)x@)  
  nCount++; 4YX/=  
 } /H3z~PBa  
 GlobalFreePtr(lpData); U[,."w]T  
 if(nCount==1) iHBetkAu  
  m_Number.Format("%d picture captured.",nCount); H65><38X/  
 else >pdWR1ox  
  m_Number.Format("%d pictures captured.",nCount); `\_>P@qz  
  UpdateData(FALSE); M#Kke9%2  
} nvY%{Zf$}  
T+1:[bqK  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3Xcjr2]~  
{ :{BD/6  
 if(pMsg -> message == WM_KEYDOWN) uGt}Hn  
 { Gj!9#on$7R  
  if(pMsg -> wParam == VK_ESCAPE) C.4r`F$p  
   return TRUE; rZ'&'#Q  
  if(pMsg -> wParam == VK_RETURN) 4} .PQ{  
   return TRUE; ",O |uL  
 } >8M=RE n4  
 return CDialog::PreTranslateMessage(pMsg); Bie#GKc  
} =>3wI'I  
JJe8x4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !:Z lVIA  
{ >-oB%T  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KTtB!4by  
  SaveBmp(); 8L1 vt Yz  
  return FALSE; AS5' j  
} 2S,N9 (7  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ R RRF/Z;))  
 CMenu pop; !B|Aq- n,  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;YN`E  
 CMenu*pMenu=pop.GetSubMenu(0); ] MP*5U>;  
 pMenu->SetDefaultItem(ID_EXITICON); . ,h>2;f  
 CPoint pt; f.)z_RyGd  
 GetCursorPos(&pt); Jt ++3]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); -d>2&)5  
 if(id==ID_EXITICON) `)y<X#[8  
  DeleteIcon(); %B}<5iO  
 else if(id==ID_EXIT) >^:*x_a9  
  OnCancel(); WoV"&9y  
 return FALSE; Z=ZTSl   
} pmwVVUEQ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); = -bGH   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )_C+\K*  
 AddIcon(); qTZ\;[CrP"  
 return res; amTeT o]Tg  
} A4uKE"WE  
j)nL!":O  
void CCaptureDlg::AddIcon() 6C'W  
{ *qa.hqas  
 NOTIFYICONDATA data; S4 j5-  
 data.cbSize=sizeof(NOTIFYICONDATA); Jn7T5$pJ  
 CString tip; #B2a?   
 tip.LoadString(IDS_ICONTIP); TW?_fse*[  
 data.hIcon=GetIcon(0); )d~{gPr.  
 data.hWnd=GetSafeHwnd(); )2sE9G,  
 strcpy(data.szTip,tip); S2i*Li  
 data.uCallbackMessage=IDM_SHELL; q]scKWYI  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !\< [}2}  
 data.uID=98; ^/~ZP?%]  
 Shell_NotifyIcon(NIM_ADD,&data); dvAG}<  
 ShowWindow(SW_HIDE); 0 i'bo*  
 bTray=TRUE; 22OfbwCb  
} q\pI&B  
6b2Z}B  
void CCaptureDlg::DeleteIcon() |`|#-xu  
{ YjCHKI"e  
 NOTIFYICONDATA data; q@Aw]Kh  
 data.cbSize=sizeof(NOTIFYICONDATA); 6,;dU-A+  
 data.hWnd=GetSafeHwnd(); `.z"Q%uz  
 data.uID=98;  \OJam<hZ  
 Shell_NotifyIcon(NIM_DELETE,&data); CZ 33|w  
 ShowWindow(SW_SHOW); Kpg?' !I  
 SetForegroundWindow(); ty8>(N(~  
 ShowWindow(SW_SHOWNORMAL); w!dgIS$  
 bTray=FALSE; d88Dyzz  
} +0ALO%G;G"  
_`I}"`2H  
void CCaptureDlg::OnChange() *z'v  
{ WKAG)4  
 RegisterHotkey(); T>hrKn.!D:  
} ?:tk8Kgf  
gc\/A\F<  
BOOL CCaptureDlg::RegisterHotkey() <78*-Ob  
{ 5jq @ nq6  
 UpdateData(); kzk8b?rOA  
 UCHAR mask=0; q4ttmL8  
 UCHAR key=0; :5sjF:@  
 if(m_bControl) g#k@R'7E  
  mask|=4; \ 5.nr*5  
 if(m_bAlt) )n6,uTlOw  
  mask|=2; u`CHM:<<?  
 if(m_bShift) < z#.J]  
  mask|=1; z]2MR2W@X  
  key=Key_Table[m_Key.GetCurSel()]; Oq^t[X'  
 if(bRegistered){ Z9G4in8  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); G|o O  
  bRegistered=FALSE; G} f9:G  
 } RNF%i~nhO  
 cMask=mask; &S=Qu?H  
 cKey=key; 2`^6``  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); gR+P !Eow  
 return bRegistered; Mkh/+f4  
} [_eT{v2B4  
3$?nzKTW\  
  四、小结 0bpGPG's&  
#<~oR5ddlb  
  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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