社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 5998阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: [x%[N)U3  
  )d~{gPr.  
  一、实现方法 2x5^kN7  
(n{x"rLy/  
  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: z`}z7e'>  
^yLhL^Y  
#pragma data_seg("shareddata") ThvgYv--B  
HHOOK hHook =NULL; //钩子句柄 _sqj~|K  
UINT nHookCount =0; //挂接的程序数目 &L[i"1a  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 @vZeye  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9epMw-)k  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey D~ogq]  
static int KeyCount =0; mO=A50_&,Q  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 q@Aw]Kh  
#pragma data_seg() ' kOkwGf!  
*"nN To  
  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。 '\O[j*h^.  
hv0bs8h  
  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: dzQs7D}  
dy>5LzqK3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR K/iFB  
cKey,UCHAR cMask) : E`78  
{ n1U!od  
 BOOL bAdded=FALSE; \wV^uS   
 for(int index=0;index<MAX_KEY;index++){ XL3m#zW&  
  if(hCallWnd[index]==0){ J Bgq2  
   hCallWnd[index]=hWnd; ["fUSQ  
   HotKey[index]=cKey; tVv/G ~(  
   HotKeyMask[index]=cMask; G! Y l0Zr  
   bAdded=TRUE; ,&~-Sq) ~  
   KeyCount++; ,<=gPs;x  
   break; )2 lB  
  } $l $p|  
 } $d-$dM?R5  
 return bAdded; 3D-0 N0o  
} w/z o  
//删除热键 (_%l[:o6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s\zY^(v4  
{ "XQ3mi`y  
 BOOL bRemoved=FALSE; =Vm3f^  
 for(int index=0;index<MAX_KEY;index++){ 0u;a*#V@  
  if(hCallWnd[index]==hWnd){ gvFJ~lL  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ S{m:Iij[;  
    hCallWnd[index]=NULL; /3#h]5Y"T  
    HotKey[index]=0; wz..  
    HotKeyMask[index]=0; %4wEAi$I  
    bRemoved=TRUE; RNF%i~nhO  
    KeyCount--; &S=Qu?H  
    break; (%c&Km7K  
   } Gf +>Aj U'  
  } |<Y~\ |  
 } p/yz`m T'w  
 return bRemoved; w@"Zjbs`  
} /Y=_EOS  
s3Wjhw/  
QQ`tSYgex  
  DLL中的钩子函数如下: m@Dra2Cv'@  
o~<jayqU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) u6 QW*8b4  
{ 4.Q[Tu  
 BOOL bProcessed=FALSE; >V?W_oM)  
 if(HC_ACTION==nCode) ^F'~|zc"C  
 { H:EK&$sU  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 IgjPy5k  
   switch(wParam) &pf"35ll  
   {  25f[s.pv8  
    case VK_MENU: L@'2}7N1%  
     MaskBits&=~ALTBIT; $Zr \$z2  
     break; &pQ[(|=(  
    case VK_CONTROL: M]|]b-#  
     MaskBits&=~CTRLBIT; Y<IuwS  
     break; Ee_?aG e&  
    case VK_SHIFT: a@Vk(3Rx_  
     MaskBits&=~SHIFTBIT; vz(=3C[  
     break; /!JxiGn  
    default: //judge the key and send message sSf;j,7V  
     break; 9OFH6-;6`\  
   } ^*YoNd_kpN  
   for(int index=0;index<MAX_KEY;index++){ %K+hG=3O  
    if(hCallWnd[index]==NULL) CIui9XNU  
     continue; \K9.]PfbI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fW Pa1E@  
    { *s#6e}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  ?H!jKX  
     bProcessed=TRUE; Nd]RbX  
    } )Z/$;7]#  
   } y #C9@C  
  } H,W8JNPs  
  else if((lParam&0xc000ffff)==1){ //有键按下 <)pPq+  
   switch(wParam) ^rs{1S  
   { OLtXk  
    case VK_MENU: e_-7,5Co  
     MaskBits|=ALTBIT; rizjH+  
     break; MQDLC7Y.p5  
    case VK_CONTROL: 7O8 @T-f+2  
     MaskBits|=CTRLBIT; E2 FnC}#W  
     break; $vK,Gugcx  
    case VK_SHIFT: 7IFZK\V  
     MaskBits|=SHIFTBIT; wpp!H<')  
     break; Y}xM&%  
    default: //judge the key and send message 7NT0]j(w-  
     break; \[qxOZ{  
   } {\`y)k 7  
   for(int index=0;index<MAX_KEY;index++){ ;jaugKf  
    if(hCallWnd[index]==NULL) [NJ2rQ/w7  
     continue; IhBQ1,&J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sPb}A$'  
    { bHcBjk.\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1;KJUf[N  
     bProcessed=TRUE; iITMBS`}  
    } :Jf</uP_  
   } dGj0;3FI%  
  } m,"-/)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  }D+ b`,  
   for(int index=0;index<MAX_KEY;index++){ s?s ,wdp  
    if(hCallWnd[index]==NULL) $9j>oUG  
     continue; BW6Ox=sr<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?(U;T!n  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); JU;`c>8=)  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 @ ;@~=w  
   } -T;^T1  
  } $a8,C\m e?  
 } 3M(*q4A$"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); k q]E@tE*3  
} {]U \HE1w  
GqNOWK2O  
  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: "+4Jmf9  
00'SceL=`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vNs`UkA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p;'.7_1  
Kxa1F,dZ  
  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: }Xk_ xQVt{  
Sk"hqF.2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) tBfmjxv  
{ "g)bNgGV}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ',!jYh}Uxk  
 { !Y r9N4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ,;5%&T  
  SaveBmp(); mn=b&{')e  
  return FALSE; PNd'21N  
 } Aqmw#X  
 …… //其它处理及默认处理 O9-`e  
} <wb6)U.  
-"S94<Y  
0:71Xm  
  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。 `R xCs`  
&;pM<h  
  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。 ?% 8%1d  
\.oJ/++  
  二、编程步骤 ;du},>T$n  
/\<x8BJ  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Z*f%R\u  
'K02T:\iZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; l`l6Y>c*]  
 ^|zag  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; _68vSYr  
XkkzY5rxOc  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; !;mn]wR>a  
TmftEw>u  
  5、 添加代码,编译运行程序。 z;P#  
J)y g<*/3  
三、程序代码 2}XRqa.|  
v0!|TI3s  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL [ `1` E1X  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) }aVzr}!  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ lw gwdB  
#if _MSC_VER > 1000 E:M,nSc)53  
#pragma once ]\ !ka/%  
#endif // _MSC_VER > 1000 /*>}y$  
#ifndef __AFXWIN_H__ YmFg#eS  
#error include 'stdafx.h' before including this file for PCH 9xj }<WM  
#endif g 8uq6U  
#include "resource.h" // main symbols iZiT/#,H2  
class CHookApp : public CWinApp F .Zk};lb  
{ [zm@hxym  
 public: kaQNcMcq  
  CHookApp(); uF|_6~g  
  // Overrides 2A@oa9  
  // ClassWizard generated virtual function overrides DBsoa0w  
  //{{AFX_VIRTUAL(CHookApp) u-y?i`  
 public: ,SNrcwv  
  virtual BOOL InitInstance(); Ipq0 1 +  
  virtual int ExitInstance(); ) 3"!Q+  
  //}}AFX_VIRTUAL X<.l(9$  
  //{{AFX_MSG(CHookApp) $0K@= 7ms  
  // NOTE - the ClassWizard will add and remove member functions here. VD@$y^!H  
  // DO NOT EDIT what you see in these blocks of generated code ! <uS/8MP{  
  //}}AFX_MSG 3Mm_xYDud  
  DECLARE_MESSAGE_MAP() P(Rl/eyRM  
}; W|Sab$h  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); eR>8V8@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b/qK/O8J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L7aVj&xM  
BOOL InitHotkey(); s@iY'11  
BOOL UnInit(); o6;  
#endif Z2yO /$<  
Cw(ypu  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. qD\9h`a  
#include "stdafx.h" 1$Q[%9  
#include "hook.h" QwpX3 k6  
#include <windowsx.h> 'h0>]A 2|X  
#ifdef _DEBUG %{4 U\4d@'  
#define new DEBUG_NEW :<B_V<  
#undef THIS_FILE $z*"@  
static char THIS_FILE[] = __FILE__; axt;}8  
#endif "= %"@"<)  
#define MAX_KEY 100 jUNt4  
#define CTRLBIT 0x04 ](Wa:U}Xs  
#define ALTBIT 0x02 l3ogMRq@  
#define SHIFTBIT 0x01 Kw;gQk~R!  
#pragma data_seg("shareddata") "0Z /|&  
HHOOK hHook =NULL; *S.FM.r  
UINT nHookCount =0; 8@LWg d  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 2cQ~$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 6lg]5d2CD  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey n{M Th_C4n  
static int KeyCount =0; EATVce]T  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #oa>Z.?_V  
#pragma data_seg() D8u`6/^  
HINSTANCE hins; r ~UDK]?V  
void VerifyWindow();  )sdHJ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >KP,67  
//{{AFX_MSG_MAP(CHookApp) x=xo9wEg  
// NOTE - the ClassWizard will add and remove mapping macros here. o!~XYEXvUa  
// DO NOT EDIT what you see in these blocks of generated code! 4t }wMOR  
//}}AFX_MSG_MAP *_YR*e0^nN  
END_MESSAGE_MAP() elhP!"G  
aACPyfGQ  
CHookApp::CHookApp() a?nK|Q=e  
{ t7u*j-YE  
 // TODO: add construction code here, J;>~PXB  
 // Place all significant initialization in InitInstance ,D }Ka?  
} {_*G"A 9  
"&f|<g5  
CHookApp theApp; \xggIW.^0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =hb)e}l  
{ fPKpV`Hr3  
 BOOL bProcessed=FALSE; U`EOun ,  
 if(HC_ACTION==nCode) _+aR| AEC  
 { /D;ugc*3  
  if((lParam&0xc0000000)==0xc0000000){// Key up :vEfJSA 1<  
   switch(wParam) E:/!]sm!  
   { ]nebL{}5  
    case VK_MENU: }T\.;$f  
     MaskBits&=~ALTBIT; v@GhwL  
     break; b:~#;$g  
    case VK_CONTROL: v9r.w-  
     MaskBits&=~CTRLBIT; :;hg :Q:  
     break; e~(e&4pb  
    case VK_SHIFT: A'~mJO/   
     MaskBits&=~SHIFTBIT; [o(!/38"@=  
     break; 4XVwi<)  
    default: //judge the key and send message G;vj3#u?  
     break; y0T#Qq  
   } ?qSwV.l]d  
   for(int index=0;index<MAX_KEY;index++){ 2bw) , W  
    if(hCallWnd[index]==NULL) xSM1b5=Pu  
     continue; BH~zeJ*Pr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r0[<[jEh  
    { ^ swj!da  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Tq )hAZ  
     bProcessed=TRUE; \}.bTca  
    } j} /).O  
   } CEw%_U@8  
  } NrXIaN  
  else if((lParam&0xc000ffff)==1){ //Key down #prYZcHv:_  
   switch(wParam) .5s58H cg,  
   { -V~Fj~b#  
    case VK_MENU: Ut'T!RD  
     MaskBits|=ALTBIT; ,:J[|9  
     break; 3V^5 4_  
    case VK_CONTROL: 6la'\l#  
     MaskBits|=CTRLBIT; V3cKdlu Na  
     break; LprGsqr:  
    case VK_SHIFT: G}l9 [lE  
     MaskBits|=SHIFTBIT; Iq,h}7C8'  
     break; F7b% x7b  
    default: //judge the key and send message =X5w=(&  
     break; wN%lc3[/z2  
   } cH5  
   for(int index=0;index<MAX_KEY;index++) sm{0o$\Z  
   { MS#*3Md&y  
    if(hCallWnd[index]==NULL) VO {z)_  
     continue; oGI'a:iff  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  *BM#fe  
    { acke q#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); s1::\&`za  
     bProcessed=TRUE; :tnW ivrwR  
    } k\SqDmv  
   } ST[TKL<]  
  } ]v>[r?X#V  
  if(!bProcessed){ <+ [N*  
   for(int index=0;index<MAX_KEY;index++){ "HqmS  
    if(hCallWnd[index]==NULL) rX5"p!z  
     continue; }vY^e OK.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) YCb|eS^u  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Z]DZ:dF  
   } M1NdlAAf  
  } 6[R6P:v&'G  
 } 8`)* ?Q9~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); k+"7hf=C|  
} w nQy   
Srmr`[i  
BOOL InitHotkey() ',]Aj!q  
{ V{q*hQd_3  
 if(hHook!=NULL){ DOFW"SpE  
  nHookCount++; i={4rZOD^  
  return TRUE; CC3 i@  
 } WW6-oQs_#*  
 else q&9]4j  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); C|IHRw`[  
  if(hHook!=NULL) "bRjY?D  
   nHookCount++; /\mYXi \  
  return (hHook!=NULL); LQ%QFfC  
} \P":V  
BOOL UnInit() `\"<%CCe  
{ 3[_WTwX0  
 if(nHookCount>1){ PbS1`8|4  
  nHookCount--; *3={s"a.(  
  return TRUE; ?Q"<AL>Z  
 } (X5y%~;V5a  
 BOOL unhooked = UnhookWindowsHookEx(hHook); /&47qU4PJ  
 if(unhooked==TRUE){ wVI_SQ<8V  
  nHookCount=0; _s0)Dl6K  
  hHook=NULL; +eH`mI0f  
 } n<FUaR>q}  
 return unhooked; ZQ`4'|"  
} r 20!   
90iveb21}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jxm#4  
{ MxX)&327  
 BOOL bAdded=FALSE; kiyKL:6D|  
 for(int index=0;index<MAX_KEY;index++){ [hot,\+f  
  if(hCallWnd[index]==0){ <wFmfrx+v  
   hCallWnd[index]=hWnd; ONpvx5'#  
   HotKey[index]=cKey; 3w p@OF_  
   HotKeyMask[index]=cMask; BKI-Dh  
   bAdded=TRUE; a[j]fv*6  
   KeyCount++; H<ovIMd  
   break; c'VCCXe  
  } $>_`.*I/  
 } BT0;I  
 return bAdded; Uj 4HVd  
} 1uKIO{d @  
,+h<qBsV@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >jTiYJI_M  
{ rc>}3?o  
 BOOL bRemoved=FALSE; 1/ j >|  
 for(int index=0;index<MAX_KEY;index++){ (gvnIoDl0  
  if(hCallWnd[index]==hWnd){ 3"my!}03  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ NW;_4g4qE  
    hCallWnd[index]=NULL; >b0 Bvx-  
    HotKey[index]=0; ' i5}`\  
    HotKeyMask[index]=0; 4 )}>dxv  
    bRemoved=TRUE; l]t^MEoc8  
    KeyCount--; l'2vo=IQ  
    break; FGc#_4SiL  
   } `S? _=JIX  
  } !h}Vz  
 } aA>!p{/x  
 return bRemoved; y,jpd#Y  
} ir\)Hz2P  
!U2<\!_  
void VerifyWindow() HL$7Ou  
{ `\ IaeMvo  
 for(int i=0;i<MAX_KEY;i++){ `<T4 En  
  if(hCallWnd!=NULL){ ?kV_!2U)'K  
   if(!IsWindow(hCallWnd)){ Uh1UZ r  
    hCallWnd=NULL; ';.y`{/  
    HotKey=0; }c= Y<Cdh  
    HotKeyMask=0; \0;w7tdo  
    KeyCount--; /?Y4C)G  
   } w&es N$2  
  } k[<i+C";  
 } s{X+0_@Q  
} !P=L0A`  
'ju_l)(R  
BOOL CHookApp::InitInstance() 5oB#{h  
{ 4~oRcO8!Y  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); =1!.g"0  
 hins=AfxGetInstanceHandle(); @_c&lToj_  
 InitHotkey(); g.;2N9  
 return CWinApp::InitInstance(); &F[N$6:v  
} N(J#<;!yb  
'?NMQ  
int CHookApp::ExitInstance() , .=7{y~  
{ 2p 7;v7)y  
 VerifyWindow(); ?uP5("c  
 UnInit(); i~<.@&vt  
 return CWinApp::ExitInstance(); &"Cy&[  
} x2b t^!t.  
apM)$  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file E/1:4?1 S  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +m~3InWq  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3FO-9H  
#if _MSC_VER > 1000 ,|zwY~l t5  
#pragma once 4pcIH5)z  
#endif // _MSC_VER > 1000 +yk0ez  
e&[~}f?  
class CCaptureDlg : public CDialog aDLlL?r3  
{ !VudZ]Sg  
 // Construction Aq'~'hS`1  
 public: kxAT  
  BOOL bTray; U =g&c `  
  BOOL bRegistered; D^];6\=.i  
  BOOL RegisterHotkey(); [(8s\>T  
  UCHAR cKey; <5FGL96  
  UCHAR cMask; 0R]'HA>  
  void DeleteIcon(); [{`&a#Q  
  void AddIcon(); ?f:0GE7  
  UINT nCount; ?e+y7K}"]  
  void SaveBmp(); [V;u7Z\r-  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^foCcO  
  // Dialog Data DI-CC[  
  //{{AFX_DATA(CCaptureDlg) 4QiV@#o:  
  enum { IDD = IDD_CAPTURE_DIALOG }; .K#' Fec  
  CComboBox m_Key; 2Mw`  
  BOOL m_bControl; hHOx ]  
  BOOL m_bAlt; *'{9(Oj  
  BOOL m_bShift;  aqi]5,  
  CString m_Path; 3_i29ghv  
  CString m_Number; &wkb r2P  
  //}}AFX_DATA (Nf!E[ }Z  
  // ClassWizard generated virtual function overrides wYv++< z  
  //{{AFX_VIRTUAL(CCaptureDlg) %(\et%[]  
 public: sVnpO$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Eh9{n,5-  
 protected: l u{6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M4d4b  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :V)=/mR  
  //}}AFX_VIRTUAL ):L0{W{  
  // Implementation (J(SwL|  
 protected: YXU2UIY<~  
  HICON m_hIcon; +&M>J|  
  // Generated message map functions x;STt3M~  
  //{{AFX_MSG(CCaptureDlg) !0KN A1w,  
  virtual BOOL OnInitDialog(); =C)2DWJ1  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); e>uq/|.!  
  afx_msg void OnPaint(); Wh%@  
  afx_msg HCURSOR OnQueryDragIcon(); 6mIRa(6V  
  virtual void OnCancel(); f{(D+7e}  
  afx_msg void OnAbout(); >4=7t&h  
  afx_msg void OnBrowse(); wo86C[  
  afx_msg void OnChange(); |F ~U  
 //}}AFX_MSG y;.5AvfD  
 DECLARE_MESSAGE_MAP() $ 93j;  
}; b'`C<Rk  
#endif 8ux  
o7v9xm+  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;_=dB[M  
#include "stdafx.h" m^tf=O<  
#include "Capture.h" %wJ?+D/  
#include "CaptureDlg.h" +ul.P)1J6  
#include <windowsx.h> ,C'mE''x  
#pragma comment(lib,"hook.lib") `yRt?UQRS  
#ifdef _DEBUG 7Mh!@Rd_V  
#define new DEBUG_NEW ]0}NF  
#undef THIS_FILE |B\76Nk  
static char THIS_FILE[] = __FILE__; {q);1Nnf  
#endif W{]r_`=:6S  
#define IDM_SHELL WM_USER+1 m='_ O+ $  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @.QuIm8,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OeQ~g-n  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; j#H&~f  
class CAboutDlg : public CDialog S09Xe_q  
{ Ff[GR$m  
 public: +xYg<AFS  
  CAboutDlg(); ]9 9; 7  
  // Dialog Data R:44Gv7  
  //{{AFX_DATA(CAboutDlg) &?9~e>.OS  
  enum { IDD = IDD_ABOUTBOX }; BGO pUy  
  //}}AFX_DATA PiNf;b^9  
  // ClassWizard generated virtual function overrides J$yJ2G  
  //{{AFX_VIRTUAL(CAboutDlg) Z,, qmwd  
 protected: u6*0% Km  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #<-%%  
  //}}AFX_VIRTUAL *Oh]I|?  
  // Implementation ;,@Fz  
 protected: (~#-J7  
  //{{AFX_MSG(CAboutDlg) _J_QB]t  
  //}}AFX_MSG ,@8*c0Y~<!  
  DECLARE_MESSAGE_MAP() aq^OzKP?  
}; z{U^j:A  
% )}rQqQ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4tp }  
{ )u=a+T  
 //{{AFX_DATA_INIT(CAboutDlg) c 1{nOx  
 //}}AFX_DATA_INIT #b;TjnC5{$  
} i%r+/D)KvG  
Z4T{CwD`D  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) % hRH80W|  
{ ev5m(wR  
 CDialog::DoDataExchange(pDX); 0(^ N  
 //{{AFX_DATA_MAP(CAboutDlg) DC'L-]#<  
 //}}AFX_DATA_MAP 9u_D@A"aC`  
} lMjeq.5nP  
U/{#~P5s  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) XK@Ct eP"  
 //{{AFX_MSG_MAP(CAboutDlg) w.-J2%J   
 // No message handlers fvV5G,lD3h  
 //}}AFX_MSG_MAP sN/8OLc  
END_MESSAGE_MAP() 8iUKG  
?T>)7Y)  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,Y0qGsV  
: CDialog(CCaptureDlg::IDD, pParent)  ByjgM`  
{ iz6+jHu'l  
 //{{AFX_DATA_INIT(CCaptureDlg) /t _QA  
  m_bControl = FALSE; [T2!,D.  
  m_bAlt = FALSE; F<2qwP  
  m_bShift = FALSE; `M,Gsy1h  
  m_Path = _T("c:\\"); >ti)m >f  
  m_Number = _T("0 picture captured."); wG&rkg";#  
  nCount=0; <im<0;i&e  
  bRegistered=FALSE; 3'tq`t:SQ  
  bTray=FALSE; ]/?$DNjCc  
 //}}AFX_DATA_INIT xL!@$;J  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 F@-8J?Hl:  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 4{ED~w|  
} mFuHZ)iQG  
>q1rdq  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) C ?aa)H  
{ kOv37c'  
 CDialog::DoDataExchange(pDX); \|R\pS}4  
 //{{AFX_DATA_MAP(CCaptureDlg) k6|/ik9C  
  DDX_Control(pDX, IDC_KEY, m_Key); I=4G+h5p  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); cg}lF9;d  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6oq/\D$6~  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >u?a#5R:m  
  DDX_Text(pDX, IDC_PATH, m_Path); b}m@2DR'|m  
  DDX_Text(pDX, IDC_NUMBER, m_Number); L&Pj0K-HT3  
 //}}AFX_DATA_MAP -dH]_  
} V`"Cd?R0Z  
d{c06(#_  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) #9]O92t2UV  
//{{AFX_MSG_MAP(CCaptureDlg) ^-qz!ib  
 ON_WM_SYSCOMMAND() F<Z13]|  
 ON_WM_PAINT() 'LLpP#(  
 ON_WM_QUERYDRAGICON() rTA#4.*&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _>Oc> .MB  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) aj$&~-/ R  
 ON_BN_CLICKED(ID_CHANGE, OnChange) n6#z{,W<3  
//}}AFX_MSG_MAP |DXi~  
END_MESSAGE_MAP() )3)fq:[  
_16r8r$V  
BOOL CCaptureDlg::OnInitDialog() D#d \1g  
{ ZE6W"pbjU  
 CDialog::OnInitDialog(); %ERR^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); V6r*fEhrT_  
 ASSERT(IDM_ABOUTBOX < 0xF000); )$QZ",&5  
 CMenu* pSysMenu = GetSystemMenu(FALSE); dY.NQ1@"  
 if (pSysMenu != NULL) lQ?_1H~4=  
 { ;% l0Ml>  
  CString strAboutMenu; (Cbm*VL  
  strAboutMenu.LoadString(IDS_ABOUTBOX); \m~Oaf;$  
  if (!strAboutMenu.IsEmpty()) <d$t*vnq  
  { C&RZdh,$  
   pSysMenu->AppendMenu(MF_SEPARATOR); p w=o}-P{  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); G,,f' >  
  } d+&w7/F  
 } \&^U9=uq  
 SetIcon(m_hIcon, TRUE); // Set big icon p)*x7~3e  
 SetIcon(m_hIcon, FALSE); // Set small icon +Al* MusS  
 m_Key.SetCurSel(0); |:LklpdYe  
 RegisterHotkey(); m/ngPeZ  
 CMenu* pMenu=GetSystemMenu(FALSE); 3ZX#6*(}2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); He  LW*  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ap!i-E,"J  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); !w:pb7+G  
 return TRUE; // return TRUE unless you set the focus to a control E#c9n%E\sz  
} @e^(V$ap  
NsL!AAN[V  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) dp*E#XCr1  
{ 6MelN^\[7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) F|?}r3{aJ  
 { C$`^(?iO/  
  CAboutDlg dlgAbout; NdM \RD_R  
  dlgAbout.DoModal(); zl)r3#6hW  
 } xgZ<. r  
 else [ lE^0_+  
 { ]1|OQYG  
  CDialog::OnSysCommand(nID, lParam); :VlMszy}B3  
 } E[Ao*  
} 6'jgjWEe3&  
4+F@BxpB  
void CCaptureDlg::OnPaint() t9&=; s  
{ m%)S <L7 l  
 if (IsIconic()) |pR'#M4j4A  
 { (%*~5%l\  
  CPaintDC dc(this); // device context for painting 9oj0X>| 1  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); nSq$,tk(  
  // Center icon in client rectangle Bh()?{q  
  int cxIcon = GetSystemMetrics(SM_CXICON); !r9~K^EI  
  int cyIcon = GetSystemMetrics(SM_CYICON); 3tCT"UvTD  
  CRect rect; v'SqH,=d  
  GetClientRect(&rect); Ba9"IXKH  
  int x = (rect.Width() - cxIcon + 1) / 2; }C5Fvy6uz  
  int y = (rect.Height() - cyIcon + 1) / 2; %=i/MFGX  
  // Draw the icon YG6Y5j[-X~  
  dc.DrawIcon(x, y, m_hIcon); j`_tb   
 } qex::Qf  
 else  +Q+!#  
 { c"NGE  
  CDialog::OnPaint(); )wk9(|[o  
 } hGo/Ve+@  
} FES0lw{G#  
r-&* `Jh  
HCURSOR CCaptureDlg::OnQueryDragIcon() o> yo9n%t  
{ b:x*Hjf  
 return (HCURSOR) m_hIcon; m0JJPBp  
} kvam`8SeL  
/1?{,Das=  
void CCaptureDlg::OnCancel() `k3sl 0z%  
{ BqDOo(%1)  
 if(bTray) Hh &s.ja  
  DeleteIcon(); gTg[!}_;\N  
  CDialog::OnCancel(); {1'M76T  
} cEEnR1  
F& ['w-n%  
void CCaptureDlg::OnAbout() /5Xt<7vm8  
{ %TzdpQp"  
 CAboutDlg dlg; cxnEcX\   
 dlg.DoModal(); (YHK,aC>u  
} eyG[1EEU  
]O&yy{yYK  
void CCaptureDlg::OnBrowse() h BzZJ/jn  
{ ! Y'~?BI  
 CString str; 6' 9zpe@`  
 BROWSEINFO bi; (b+o$C  
 char name[MAX_PATH]; }\vw>iHPX@  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Gvqu v\  
 bi.hwndOwner=GetSafeHwnd(); jgT *=/GH2  
 bi.pszDisplayName=name; K#]FUUnj=  
 bi.lpszTitle="Select folder"; Wfh+D[^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; (^^}Ke{J  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); __ G=xf  
 if(idl==NULL) b`|,rfq^AZ  
  return; $K_-I8e|  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); VQn]"G( `  
 str.ReleaseBuffer(); j15t8du&O  
 m_Path=str; 36yIfC,  
 if(str.GetAt(str.GetLength()-1)!='\\') FK;2u $:  
  m_Path+="\\"; nT@FS t  
 UpdateData(FALSE); I6[=tB  
} EK zYL#(i  
i [6oqZ  
void CCaptureDlg::SaveBmp() .'S_9le  
{ ^\3z$ntF  
 CDC dc; 5>rjL ;  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 'UB"z{w%  
 CBitmap bm; [<VyH.  
 int Width=GetSystemMetrics(SM_CXSCREEN); g HKA:j`c  
 int Height=GetSystemMetrics(SM_CYSCREEN); kTo{W]9]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 6KKQ)DNu_  
 CDC tdc; ]?~[!&h  
 tdc.CreateCompatibleDC(&dc); "qw.{{:tf  
 CBitmap*pOld=tdc.SelectObject(&bm); A "~Oi  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); BV]$= e'  
 tdc.SelectObject(pOld); wQ\bGBks  
 BITMAP btm; =[`gfw  
 bm.GetBitmap(&btm); ;>jOB>b{h  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; XF99h&;9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); UsdUMt!u  
 BITMAPINFOHEADER bih; l"9$lF}  
 bih.biBitCount=btm.bmBitsPixel; uar[D|DcD"  
 bih.biClrImportant=0; iU4Z9z!  
 bih.biClrUsed=0; : W0;U  
 bih.biCompression=0; '! ~ s=  
 bih.biHeight=btm.bmHeight; ilFS9A3P  
 bih.biPlanes=1; tj[-|h  
 bih.biSize=sizeof(BITMAPINFOHEADER); ,w7ZsI4:[  
 bih.biSizeImage=size; d6~d)E  
 bih.biWidth=btm.bmWidth; H;RgYu2J  
 bih.biXPelsPerMeter=0; t&rr;W]  
 bih.biYPelsPerMeter=0; i&JI"Dd7  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); z=DK(b;$z  
 static int filecount=0; M.KXDD#O  
 CString name; <}1GYeP  
 name.Format("pict%04d.bmp",filecount++);  P'oY +#  
 name=m_Path+name; opqf)C  
 BITMAPFILEHEADER bfh; r+}<]?aT>-  
 bfh.bfReserved1=bfh.bfReserved2=0; da5fKK/s  
 bfh.bfType=((WORD)('M'<< 8)|'B'); fx/If  
 bfh.bfSize=54+size; ^Rmrre`uU  
 bfh.bfOffBits=54; #\MkbZc d  
 CFile bf; IdciGS6 t  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ >~@ABLp 6  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +<f!#4T  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p *GAs C  
  bf.WriteHuge(lpData,size); PpR eqmo  
  bf.Close(); );fPir?+  
  nCount++; s7:w>,v/  
 } *5R91@xt  
 GlobalFreePtr(lpData); c_syJ<  
 if(nCount==1) y?8V'.f|  
  m_Number.Format("%d picture captured.",nCount); ]H=P(Z -  
 else \-I)dMm[  
  m_Number.Format("%d pictures captured.",nCount); ;;n=(cM|z  
  UpdateData(FALSE); /P/::$  
} v#$}3+KVC  
&%@>S.  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ' g Fewo  
{ ?/24-n  
 if(pMsg -> message == WM_KEYDOWN) F1&7m )f$l  
 { "nC=.5/$  
  if(pMsg -> wParam == VK_ESCAPE) /{nZ I_v#  
   return TRUE; r }Nq"s<  
  if(pMsg -> wParam == VK_RETURN) wI2fCq(a0  
   return TRUE; mp17d$R-  
 } 3H,>[&d  
 return CDialog::PreTranslateMessage(pMsg); )-S;j)(+  
} T%1Kh'92  
5 OF*PBZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q??N,  
{ Ox+}JB [  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ( ALsc@K  
  SaveBmp(); d$v{oC }  
  return FALSE; 8:}$L)[V  
} ]`eJSk.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ N"/be  
 CMenu pop; =N{-lyr)  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); L'}^Av_+  
 CMenu*pMenu=pop.GetSubMenu(0); o)Nm5g  
 pMenu->SetDefaultItem(ID_EXITICON); I}1<epd ,  
 CPoint pt; }3y Q*<  
 GetCursorPos(&pt); Ui;PmwQc&  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ,\E5et4  
 if(id==ID_EXITICON) WvHy}1W  
  DeleteIcon(); IR<*OnKn  
 else if(id==ID_EXIT) nF{>RD  
  OnCancel(); 1Yy*G-7}  
 return FALSE; dF0:'y  
} Kw,ln<)2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }#9 |au`  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `pYL/[5  
 AddIcon(); 3Tr}t.mt  
 return res; ,:"c"   
} PoRL35  
M@O<b-  
void CCaptureDlg::AddIcon() BZ@v8y _TA  
{ Wx-rW  
 NOTIFYICONDATA data; ,ikn%l#cm  
 data.cbSize=sizeof(NOTIFYICONDATA); /BfCh(B  
 CString tip; B,RHFlp{  
 tip.LoadString(IDS_ICONTIP); 3|.KEJC"  
 data.hIcon=GetIcon(0); SLI358]$<  
 data.hWnd=GetSafeHwnd(); e+P|PW  
 strcpy(data.szTip,tip); )lB*] n`Z]  
 data.uCallbackMessage=IDM_SHELL; %~YQl N  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9/LJ tM  
 data.uID=98; g;<_GL  
 Shell_NotifyIcon(NIM_ADD,&data); ut;KphvSH  
 ShowWindow(SW_HIDE); PVUNi: h  
 bTray=TRUE; X.<2]V7!  
} ' $X}'u  
?c# v'c^=h  
void CCaptureDlg::DeleteIcon() 4p_@f^v~QH  
{ HH,G3~EBF  
 NOTIFYICONDATA data; p4I6oS`/.  
 data.cbSize=sizeof(NOTIFYICONDATA); ~CL^%\K  
 data.hWnd=GetSafeHwnd(); 1dX)l  
 data.uID=98; kR|(hA,$N  
 Shell_NotifyIcon(NIM_DELETE,&data); qf6}\0   
 ShowWindow(SW_SHOW); SZ"^>}zl=  
 SetForegroundWindow(); Q5qQ%cu  
 ShowWindow(SW_SHOWNORMAL); Y([vma>U]  
 bTray=FALSE; sBD\;\I  
} z3p #`  
' 8bT9  
void CCaptureDlg::OnChange() B=J/HiwV)  
{ Bc2PF;n  
 RegisterHotkey(); [P"R+$"   
} Vch!&8xii  
k84JDPu#  
BOOL CCaptureDlg::RegisterHotkey() 7q,M2v;  
{ ~`x<;Ts  
 UpdateData(); t= oTU,<  
 UCHAR mask=0; gEQevy`T%c  
 UCHAR key=0; Cn(0ID+3f  
 if(m_bControl) @ 6{U*vs  
  mask|=4; 80qe5WC.2u  
 if(m_bAlt) *ocbV`  
  mask|=2; >VWH bo  
 if(m_bShift) #3act )m  
  mask|=1; -QUvd1S40  
  key=Key_Table[m_Key.GetCurSel()]; [XP3  
 if(bRegistered){ _w>9Z>PR  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); cYMlc wS  
  bRegistered=FALSE; :N([s(}!$2  
 } 7A[`%.!F6  
 cMask=mask; Bn_@R`  
 cKey=key; _jCjq   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); =1Mh %/y  
 return bRegistered; ;l6tZ]-"  
} e'Th[ wJ  
xlWTHn!j  
  四、小结 U i ~*]  
x9!vtrM\Zr  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
10+5=?,请输入中文答案:十五