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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: 6u'E}hAx|  
  :9DyABK=Cv  
  一、实现方法 \JC_"gqt  
2 g~W})e  
  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: 75pn1*"gQ  
*JRM(V+IEv  
#pragma data_seg("shareddata") jR9;<qT/  
HHOOK hHook =NULL; //钩子句柄 #kk5{*`  
UINT nHookCount =0; //挂接的程序数目 [b+B"f6  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 O]Ey@7 &  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 JXV#V7  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey $O&N  
static int KeyCount =0; 9?q ^yy  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 nA(5p?D+YB  
#pragma data_seg() l,6' S8=  
 1p K(tm  
  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。 Q/@ pcU  
#eF,* d  
  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: e(?1`1  
<*I*#WI&B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR A{dqB  
cKey,UCHAR cMask) bk0<i*ju7(  
{ r $[{sW  
 BOOL bAdded=FALSE; `,O"^zR)z  
 for(int index=0;index<MAX_KEY;index++){ VnqcpJ  
  if(hCallWnd[index]==0){ ~|[i64V<^  
   hCallWnd[index]=hWnd; ![!,i\x  
   HotKey[index]=cKey; Q,M,^_  
   HotKeyMask[index]=cMask; R , #szTu  
   bAdded=TRUE; 8`s*+.LI!  
   KeyCount++; _%3p&1ld  
   break; f9OY> |a9  
  } DR @yd,  
 } s?"\+b  
 return bAdded; k0&FUO  
} S}VN(g  
//删除热键  '[HBKn$`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <`WDNi$Y  
{ l9]nrT1Hy  
 BOOL bRemoved=FALSE; V$w bmz  
 for(int index=0;index<MAX_KEY;index++){ +xAD;A4  
  if(hCallWnd[index]==hWnd){ -'}#j\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \?wKs  
    hCallWnd[index]=NULL; 1h|qxYO  
    HotKey[index]=0; nXk9 IG(  
    HotKeyMask[index]=0; ~]24">VZf  
    bRemoved=TRUE; DxD\o+:r  
    KeyCount--; lD'^6  
    break; mE;^B%v  
   } (0l>P]"n   
  } d}  5  
 } ?^J%S,  
 return bRemoved; {H>Tv,v|  
} D-D8La?0p  
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M1]w0~G  
  DLL中的钩子函数如下: Ve qB/Q X  
P^ht$)Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) k.})3~F-  
{ nltOX@P-  
 BOOL bProcessed=FALSE; U\W$^r,  
 if(HC_ACTION==nCode) [?=DPE%  
 { XZQ-Ig18  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 m^zD']  
   switch(wParam) &G[W$2`@  
   {  f'MRC \  
    case VK_MENU: Lp3pJE  
     MaskBits&=~ALTBIT; MR: H3  
     break;  )y6  
    case VK_CONTROL: >0u*E *Y  
     MaskBits&=~CTRLBIT; Q"Exmn3p  
     break; ~.6% %1?  
    case VK_SHIFT: c}!`tBTm  
     MaskBits&=~SHIFTBIT; g6xQQ,q=l  
     break; 4=%,0.yt  
    default: //judge the key and send message R5mb4  
     break; z:N?T0b(  
   } aO}p"-'  
   for(int index=0;index<MAX_KEY;index++){ p.<d+S<  
    if(hCallWnd[index]==NULL) :?}> Q  
     continue; ~}/_QlX` K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,$aqF<+;  
    { T24$lhM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ki1 zi~  
     bProcessed=TRUE; I*f@M}  
    } eL'fJcjw<  
   } Y] UoV_  
  } fB&i{_J  
  else if((lParam&0xc000ffff)==1){ //有键按下 cp"{W-Q{$  
   switch(wParam) *3h_'3yo@  
   { VZe'6?#  
    case VK_MENU: _{ 2`sL)  
     MaskBits|=ALTBIT; kyZZ0  
     break; |MN2v[y  
    case VK_CONTROL: qG2P?DR  
     MaskBits|=CTRLBIT; _,v>P2)  
     break; 9. ,IqnP  
    case VK_SHIFT: @$CPTv3e  
     MaskBits|=SHIFTBIT; KZ1m 2R}'  
     break; *v: .]_;  
    default: //judge the key and send message r[^O 7  
     break; 8M,z#DF  
   } ~eS/gF?  
   for(int index=0;index<MAX_KEY;index++){ a2]>R<M  
    if(hCallWnd[index]==NULL) ILiOEwHS7F  
     continue; &h.?~Ri  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]zj&U#{  
    { aI|X~b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); KU Mk:5 c  
     bProcessed=TRUE; 1bDAi2 H  
    } &LG|YvMY6  
   } Ji1#>;&  
  } 5Vdy:l  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 3[?;s}61  
   for(int index=0;index<MAX_KEY;index++){ O2f-{jnTz,  
    if(hCallWnd[index]==NULL) E$A=*-u  
     continue; @7;}6,)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) h`eHoKJ#w  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); h Fan$W$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 b\kA  
   } kIe)ocJg  
  } qv >l  
 } Eg2SC?5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {lUaN0O:  
} bYX.4(R  
<u1`o`|-  
  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: ]3 Ibl^J  
t0?t Xe.B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C1qlB8(Wh>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RE-y5.kE^  
K|Xe)  
  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: -s7!:MB%g  
h0A%KL  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &" 5Yt&{  
{ d/@P;YN!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?5^DQ|Hg ^  
 { s$lJJL  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 cxFyN ;7  
  SaveBmp(); 4Me3{!HJz  
  return FALSE; )T&r770  
 } 2z AxGX  
 …… //其它处理及默认处理 ka{!' ^  
} Mhb~wDQl  
k9NHdi7&2  
<xrya _R?  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 s;[=B  
X`-o0HG  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 bb+iUV|Do  
f]C^{Uk#  
  二、编程步骤 *o!#5c  
p;D {?H/  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; OB^j b8  
E8wkqZN  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; L$"pk{'  
a] 6d hQ`  
  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; e? |4O< @  
!CY*SGO  
  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; W'Y(@  
!9.\A:G  
  5、 添加代码,编译运行程序。 "5Z5x%3I  
G_WHW(8   
三、程序代码 W@%g_V}C*  
T{N8 K K  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _Kh8 <$h  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) B1%xU?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9[ o$/x}  
#if _MSC_VER > 1000 EN,}[^Z  
#pragma once 92N`Q}  
#endif // _MSC_VER > 1000 \ NKw,`/  
#ifndef __AFXWIN_H__ Q )8I(*  
#error include 'stdafx.h' before including this file for PCH }^b  
#endif RXu` DWN  
#include "resource.h" // main symbols Zw<<p|{)<  
class CHookApp : public CWinApp ?+%bEZ`  
{ N| P?!G-=  
 public: FF|M7/[~  
  CHookApp(); [o7Qr?RN  
  // Overrides [L ' >  
  // ClassWizard generated virtual function overrides nyOmNvZf  
  //{{AFX_VIRTUAL(CHookApp) PeLzZ'$D  
 public: Gq%,'am f  
  virtual BOOL InitInstance(); N0ef5J JM`  
  virtual int ExitInstance(); :KGPQ@:O  
  //}}AFX_VIRTUAL hx4c`fOs  
  //{{AFX_MSG(CHookApp) X+N8r^&  
  // NOTE - the ClassWizard will add and remove member functions here. k @gQY_  
  // DO NOT EDIT what you see in these blocks of generated code ! @~&^1%37)  
  //}}AFX_MSG gkca{BJ   
  DECLARE_MESSAGE_MAP() D^U?!S&4~  
}; U]9k,#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); WZP1g kX&M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k 6i&NG6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KYl!Iw67d  
BOOL InitHotkey(); [8Z !dj   
BOOL UnInit(); xX Dj4j,  
#endif [81q 0@  
GNHWbC6_m  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. OsRizcgdA  
#include "stdafx.h" UgZL<}  
#include "hook.h" I%B\Wy/j^  
#include <windowsx.h> N&|,!Cu  
#ifdef _DEBUG qG]0z_dPE~  
#define new DEBUG_NEW 'tjqfR  
#undef THIS_FILE 9g.5:  
static char THIS_FILE[] = __FILE__; H!l 9a  
#endif wLvM<p7OX  
#define MAX_KEY 100 K<50>uG  
#define CTRLBIT 0x04 r8[)Ccv  
#define ALTBIT 0x02 XK)0Mt\  
#define SHIFTBIT 0x01 m3&b)O7  
#pragma data_seg("shareddata") eax"AmO  
HHOOK hHook =NULL; C 5e;U  
UINT nHookCount =0; %c8@  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey x,fL656t  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT b&AeIU}&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey X!@ Y ,  
static int KeyCount =0; lnF{5zc  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ,3!4 D^  
#pragma data_seg() *u< ZQq  
HINSTANCE hins; ToD_9i }6  
void VerifyWindow(); ,K|UUosS-#  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 2zuQeFsK  
//{{AFX_MSG_MAP(CHookApp) Yvu?M8aK!  
// NOTE - the ClassWizard will add and remove mapping macros here. ,/!^ZS*  
// DO NOT EDIT what you see in these blocks of generated code! "z_},TCy  
//}}AFX_MSG_MAP rFp>A`TJ  
END_MESSAGE_MAP() ?0qP6'nWx  
k^zU;  
CHookApp::CHookApp() ^uPg71r:  
{ WF2t{<]^e  
 // TODO: add construction code here, dfZ`M^NU  
 // Place all significant initialization in InitInstance wti  
} wrsr U  
`}rk1rl6  
CHookApp theApp; W! J@30  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7<Y aw,G  
{ =F %lx[9Ye  
 BOOL bProcessed=FALSE; Zq5~M bldh  
 if(HC_ACTION==nCode) KleiX7  
 { T8yMaC  
  if((lParam&0xc0000000)==0xc0000000){// Key up io@f5E+?  
   switch(wParam) *.Z~f"SZy*  
   { eo.B0NZsF  
    case VK_MENU: V7cr%tY5  
     MaskBits&=~ALTBIT; sa"}9IE*8  
     break; \0&F'V  
    case VK_CONTROL: oArJ%Y>  
     MaskBits&=~CTRLBIT; #&%>kfeJ)<  
     break; i?7 ?I  
    case VK_SHIFT: "b%FkD  
     MaskBits&=~SHIFTBIT; kv;P2:"|  
     break; Z#YNL-x  
    default: //judge the key and send message cH+ ~|3  
     break; Q X-n l~  
   } cS Qb3}a\  
   for(int index=0;index<MAX_KEY;index++){ ;WgUhA ;q  
    if(hCallWnd[index]==NULL) i6g=fx6j*  
     continue; RaP,dR+P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) G.PRPl  
    { v *`M3jb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1+YqdDqQ  
     bProcessed=TRUE;  T;V!>W37  
    } DgY !)cS  
   } |"+Uf w^  
  } mkl^2V13~  
  else if((lParam&0xc000ffff)==1){ //Key down 1I)oT-~  
   switch(wParam) fPPmUM^C9  
   { T''<yS  
    case VK_MENU: NB+/S;`  
     MaskBits|=ALTBIT; m(0X_& &?z  
     break; uL^`uI#I  
    case VK_CONTROL: 7!\zo mx  
     MaskBits|=CTRLBIT; tBX71d T  
     break; B-PX/Q  
    case VK_SHIFT: 5L_`Fw\l  
     MaskBits|=SHIFTBIT; d[XMQX  
     break; "\ =Phqw   
    default: //judge the key and send message Lj3Pp$h  
     break; U]@?[+I0]  
   } ,]]*}4[r  
   for(int index=0;index<MAX_KEY;index++) 3rjKwh7  
   { Y*S:/b~y  
    if(hCallWnd[index]==NULL) o?6m/Klw6  
     continue; `*U$pg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) TBRG D l  
    { t[@>u'YKt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \O\q1 s~  
     bProcessed=TRUE; beSU[  
    } XUD Ztxa  
   } A7|L|+ ?  
  } "F6gV;{Bt  
  if(!bProcessed){ K<kl2#  
   for(int index=0;index<MAX_KEY;index++){ G=SMz+z  
    if(hCallWnd[index]==NULL) 76KNgV)3  
     continue; J_.cC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b&dv("e 4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -Mz [S  
   } d ez4g  
  } ]}p<P):hO  
 } ge<D}6GQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); O?cU6u;W  
} b4WH37,lA  
=O-irGms*  
BOOL InitHotkey() (z?j{J  
{ -'SA &[7dP  
 if(hHook!=NULL){ L"n)fe$  
  nHookCount++; 6U.|0mG[  
  return TRUE; v+8Ybq  
 } K1Uq` TJ  
 else L(sT/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); /,UnT(/k(  
  if(hHook!=NULL) P.QF9%  
   nHookCount++; -V;BkE76  
  return (hHook!=NULL); Hmt2~>FI[  
} Ak8Y?#"wz  
BOOL UnInit()  Ip:54  
{ wy0?*)~  
 if(nHookCount>1){ c?u*,d) G  
  nHookCount--; RS l*u[fB  
  return TRUE; M.r7^9P  
 } Kf*Dy:e  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ^$sq U  
 if(unhooked==TRUE){ 6bLn8UT  
  nHookCount=0; 32j}ep.*  
  hHook=NULL; rNTLP m  
 } Dad$_%  
 return unhooked; 0bT[05.  
} KIag(!&  
o. ;Vrc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^_<|~  
{ o:fe`#t  
 BOOL bAdded=FALSE; RAP-vVh/C  
 for(int index=0;index<MAX_KEY;index++){ y&-QLX L  
  if(hCallWnd[index]==0){ nosD1sS.K8  
   hCallWnd[index]=hWnd; LO>42o?/i  
   HotKey[index]=cKey; n|LpM.  
   HotKeyMask[index]=cMask; R&J?X Q  
   bAdded=TRUE; }v4dOGc?  
   KeyCount++; 7B (%2  
   break; x +pf@?w  
  } 2\QsF,@`YU  
 } Dfa3&# #{  
 return bAdded; ?%}!_F`h%  
} #/f~LTE  
_#s,$K#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) VqpC@C$  
{ )1KyUQ\e  
 BOOL bRemoved=FALSE; qq]Iy=  
 for(int index=0;index<MAX_KEY;index++){ X<P <-e9  
  if(hCallWnd[index]==hWnd){ x|(pmqIH+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #mA(x@:*  
    hCallWnd[index]=NULL; OTdijQLY  
    HotKey[index]=0; AyOibnoZ2E  
    HotKeyMask[index]=0; rxH]'6kP  
    bRemoved=TRUE; 1{ %y(?`  
    KeyCount--; IhYR4?e  
    break; JcA+ztPU  
   } F!wz{i6\h  
  } oSC'b%  
 } -4& i t:  
 return bRemoved; =@?[.`  
} %&| uT  
R]iV;j|  
void VerifyWindow() ,1$F #Eh  
{ uMS+,dXy  
 for(int i=0;i<MAX_KEY;i++){ u0 t lf  
  if(hCallWnd!=NULL){ gJ'pwSA  
   if(!IsWindow(hCallWnd)){ @ 2)nhW/z6  
    hCallWnd=NULL; %dFJ'[jDL  
    HotKey=0; Qop,~yK  
    HotKeyMask=0; ABX%oZ7[|o  
    KeyCount--; J5I@*f)l  
   } *_o(~5w-K  
  } kzDN(_<1  
 } HdJ g  
} %BP>,E/w  
k[;)/LfhS  
BOOL CHookApp::InitInstance() N}K [Q=  
{ ?YLq iAA  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); D5D *$IC  
 hins=AfxGetInstanceHandle(); @we1#Vz.  
 InitHotkey(); Mz p<s<BX  
 return CWinApp::InitInstance(); 7MLLx#U  
} '#V@a  
_>R aw  
int CHookApp::ExitInstance() 7RL J  
{ MQ-u9=ys  
 VerifyWindow(); {;c'@U  
 UnInit(); N8{jvat  
 return CWinApp::ExitInstance(); 7GYf#} N  
} :^v Q4/,  
C,Nf|L((6  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %+N]$Q  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Pc`d]*BYi  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ )Y7H@e\1  
#if _MSC_VER > 1000 t?4H9~iH  
#pragma once A51 a/p#  
#endif // _MSC_VER > 1000 zVq!M-e  
f +{=##'0  
class CCaptureDlg : public CDialog gwRB6m$  
{ <46&R[17M  
 // Construction FklR!*oL,)  
 public: xR/CP.dg  
  BOOL bTray; G`Nw]_ Z_  
  BOOL bRegistered; m9DFnk<D  
  BOOL RegisterHotkey(); }kqh[`:  
  UCHAR cKey; ,PTM'O@aU#  
  UCHAR cMask; * 9^8NY]  
  void DeleteIcon(); ahg:mlaob  
  void AddIcon(); 6]?mjG6  
  UINT nCount; 3' i6<  
  void SaveBmp(); E1eGZ&&Gd  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor CO='[1"_5  
  // Dialog Data g Ed A hfx  
  //{{AFX_DATA(CCaptureDlg) e0zP LU}  
  enum { IDD = IDD_CAPTURE_DIALOG }; olE(#}7V  
  CComboBox m_Key; u ]e-IYH  
  BOOL m_bControl; &Q883A J  
  BOOL m_bAlt; w\bwa!3Y  
  BOOL m_bShift; Jr2yn{s=S  
  CString m_Path; ^ ` y7JXI:  
  CString m_Number; CUu Owx6%  
  //}}AFX_DATA 4 XjwU`  
  // ClassWizard generated virtual function overrides wtTy(j,9  
  //{{AFX_VIRTUAL(CCaptureDlg) ga 5Q  
 public: V`^*Z}d9  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ("2X8(3z  
 protected: M:/NW-:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {EoYU\x  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); nK1eh@a9Qv  
  //}}AFX_VIRTUAL n1."Qix0  
  // Implementation u7L?9  
 protected: dLiiJ6pl*  
  HICON m_hIcon; tYu<(Z(l)  
  // Generated message map functions 'x*C#mt  
  //{{AFX_MSG(CCaptureDlg) bY" zK',m  
  virtual BOOL OnInitDialog(); $oBs%.Jp  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >Ku4Il+36  
  afx_msg void OnPaint(); 2/&=:,"t,B  
  afx_msg HCURSOR OnQueryDragIcon(); pl`4&y%Me  
  virtual void OnCancel(); &n6{wtBP  
  afx_msg void OnAbout(); Z<nNk.G  
  afx_msg void OnBrowse(); lYG`)#T  
  afx_msg void OnChange(); NN*L3yx  
 //}}AFX_MSG o$*(N  
 DECLARE_MESSAGE_MAP() <fvu) f  
}; Nw*<e ]uD  
#endif W"c\/]aD  
1<r!9x9G  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file V~*Gk!+f  
#include "stdafx.h" gk%nF  
#include "Capture.h" dk|LC-]`A  
#include "CaptureDlg.h" 72dRp!J U  
#include <windowsx.h> z &EDW 5I  
#pragma comment(lib,"hook.lib") &=g3J4$z  
#ifdef _DEBUG * ,a F-  
#define new DEBUG_NEW 0= $/  
#undef THIS_FILE q<&1,^ A  
static char THIS_FILE[] = __FILE__; .4zzPD$1  
#endif jJ#D`iog5  
#define IDM_SHELL WM_USER+1 k&$ov  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); d&+]@ Ii  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z% 8`F%2  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; d%7?913  
class CAboutDlg : public CDialog COh#/-`\1  
{ q\EYsN</;  
 public: !mlfG "FE  
  CAboutDlg(); hVz yvpw  
  // Dialog Data J&A1]T4d  
  //{{AFX_DATA(CAboutDlg) Ib..X&N2  
  enum { IDD = IDD_ABOUTBOX }; <?.eU<+O`S  
  //}}AFX_DATA A9xe Oy8e  
  // ClassWizard generated virtual function overrides //63|;EEkl  
  //{{AFX_VIRTUAL(CAboutDlg) g04^M (  
 protected: (47?lw &  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4Zbn8GpC  
  //}}AFX_VIRTUAL {=GmXd%D  
  // Implementation X _ZO)|  
 protected: D6bYg `  
  //{{AFX_MSG(CAboutDlg) |+ F ~zIu'  
  //}}AFX_MSG 1#d2 +J*  
  DECLARE_MESSAGE_MAP() /e2zH  
}; \ S;[7T  
$JY \q2  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) OJ&'Z}LB  
{ w;O-ATUzN  
 //{{AFX_DATA_INIT(CAboutDlg) cGlN*GJ*H  
 //}}AFX_DATA_INIT +#Pb@^6"m  
} ##jJa SxG  
Nf] ?hfJ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;fNCbyg4 I  
{ $s7U |F,I  
 CDialog::DoDataExchange(pDX); >Scyc-n  
 //{{AFX_DATA_MAP(CAboutDlg) 0AO^d[v  
 //}}AFX_DATA_MAP  =yod  
} ^Q8yb*MN  
UR'[?  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) u@_|4Bp,"  
 //{{AFX_MSG_MAP(CAboutDlg) VIAq$iu7  
 // No message handlers EH844k8 p  
 //}}AFX_MSG_MAP mjD^iu8?  
END_MESSAGE_MAP() _&-d0'+  
r&LZH.$oh  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v'hc-Q9+>  
: CDialog(CCaptureDlg::IDD, pParent) 0D,@^vw bK  
{ v2;E Wp  
 //{{AFX_DATA_INIT(CCaptureDlg) 'zUV(K?2]  
  m_bControl = FALSE; |m's)  
  m_bAlt = FALSE; OJe!K:  
  m_bShift = FALSE; ]9YA~n\  
  m_Path = _T("c:\\"); u> {aF{  
  m_Number = _T("0 picture captured."); :E")Zw&sW3  
  nCount=0; vkG#G]Qs";  
  bRegistered=FALSE; E)*ht;u  
  bTray=FALSE; h .Qk{v  
 //}}AFX_DATA_INIT 7!J-/#!  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Jqxd92 bI  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "1a;);S=*)  
} |ke0G  
-64l f-<  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /9_%NR[  
{ 2K:A4)jZ  
 CDialog::DoDataExchange(pDX); AS;Sz/YP  
 //{{AFX_DATA_MAP(CCaptureDlg) yY#h 1  
  DDX_Control(pDX, IDC_KEY, m_Key); EXSJ@k6=8s  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 6{)pF  
  DDX_Check(pDX, IDC_ALT, m_bAlt); _^_3>}y5op  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); og";mC  
  DDX_Text(pDX, IDC_PATH, m_Path); xT> 9ZZcE  
  DDX_Text(pDX, IDC_NUMBER, m_Number); # xO PF9  
 //}}AFX_DATA_MAP Q/|.=:~FO  
} _[[0rn$  
eA& #33  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;^N lq3N  
//{{AFX_MSG_MAP(CCaptureDlg) Zn9u&!T&  
 ON_WM_SYSCOMMAND() X.<3 /  
 ON_WM_PAINT() iy~h|YK;  
 ON_WM_QUERYDRAGICON() `NtW+v  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?|ZbQz(bL  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Ck/44Wfej  
 ON_BN_CLICKED(ID_CHANGE, OnChange) fTj@/"a  
//}}AFX_MSG_MAP gXI-{R7Me  
END_MESSAGE_MAP() d[6 'w ?  
D9+qT<ojN  
BOOL CCaptureDlg::OnInitDialog() WaB0?jI  
{ JMB#KzvN[  
 CDialog::OnInitDialog(); XZ%[;[  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); icb)JZ1K  
 ASSERT(IDM_ABOUTBOX < 0xF000); 4M&$wi  
 CMenu* pSysMenu = GetSystemMenu(FALSE); a#]V|1*O  
 if (pSysMenu != NULL) $ W7}Igx#  
 { CU|E-XPW  
  CString strAboutMenu; ?>;b,^4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); gGP6"|tc4  
  if (!strAboutMenu.IsEmpty()) ChK-L6  
  { "6d0j)YO  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5Y+YN1  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); yy3x]%KK  
  } ;O7"!\  
 } J$6WUz:?  
 SetIcon(m_hIcon, TRUE); // Set big icon Z]B v  
 SetIcon(m_hIcon, FALSE); // Set small icon P^OmJ;""D  
 m_Key.SetCurSel(0); }-fHS;/  
 RegisterHotkey(); BWxfY^,'&6  
 CMenu* pMenu=GetSystemMenu(FALSE); O7 ;=g!j  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +6uf6&.@~  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )h@PRDI_  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); /xUF@%rT  
 return TRUE; // return TRUE unless you set the focus to a control Q\4tzb]  
} E3 % ~!ZC  
A l?%[-u  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %?[gBf[y  
{ c!E{fSP  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) *+rfRH]a  
 { AO5&Y.A#  
  CAboutDlg dlgAbout; #TNjQNg@O  
  dlgAbout.DoModal(); P;.roD9  
 } s4|tWfZ  
 else 9`Qa/Y!  
 { :!_l@=l  
  CDialog::OnSysCommand(nID, lParam); 8gavcsVE[  
 } 0U7Gl9~  
} [~8U],?1  
'd2 :a2C]  
void CCaptureDlg::OnPaint() <TVJ9l  
{ <r,5F:  
 if (IsIconic()) +.~K=.O)  
 { 6CFnE7TQf  
  CPaintDC dc(this); // device context for painting nFJW\B&(`  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2,:{ 5]Q$  
  // Center icon in client rectangle BI%^7\HZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); {#kCqjWG  
  int cyIcon = GetSystemMetrics(SM_CYICON); Z7bJ<TpZ  
  CRect rect; poAJl;T  
  GetClientRect(&rect); 85!]N F  
  int x = (rect.Width() - cxIcon + 1) / 2; 7RDmvWd-'?  
  int y = (rect.Height() - cyIcon + 1) / 2; H{n:R *  
  // Draw the icon rQl9SUs  
  dc.DrawIcon(x, y, m_hIcon); Stw g[K0<  
 } /Pe xtj<  
 else E0I/]0  
 { _]@u)$  
  CDialog::OnPaint(); cD]H~D}M  
 } DY#195H  
} w4P;Z-Cd  
I8! .n  
HCURSOR CCaptureDlg::OnQueryDragIcon() /)kJ iV  
{ ?lkB{-%rQ  
 return (HCURSOR) m_hIcon; @2T8H  
} }vh <x6  
_FOIMjh%N  
void CCaptureDlg::OnCancel() H<|}p Z  
{ (-$5YKm  
 if(bTray) bVz<8b6h'-  
  DeleteIcon(); +c/!R|h=S  
  CDialog::OnCancel(); 693"Pg8b  
} 2->Lz  
SZTn=\  
void CCaptureDlg::OnAbout() 0uD3a-J  
{ 'Y @yW3K  
 CAboutDlg dlg; 8KJ`+"<=@  
 dlg.DoModal(); 2pmj*Y3"8  
} K&&T:'=/  
(.=ig X  
void CCaptureDlg::OnBrowse() 7>z {2D  
{ J;~YD$  
 CString str; Aa_@&e  
 BROWSEINFO bi; [;Ih I  
 char name[MAX_PATH]; T;3qE1c  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); iT:i '\~  
 bi.hwndOwner=GetSafeHwnd(); ]2l}[ w71|  
 bi.pszDisplayName=name; "8%$,rG1&  
 bi.lpszTitle="Select folder"; Zj -#"Gm  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; adu6`2 *$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); gs!'*U)  
 if(idl==NULL) oUn+tu:  
  return; w2xD1oK~o  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); f3Zf97i  
 str.ReleaseBuffer(); Sed 8Q-m  
 m_Path=str; Ej)7[  
 if(str.GetAt(str.GetLength()-1)!='\\') L{VnsY V  
  m_Path+="\\"; 4L:O0Ggz}  
 UpdateData(FALSE); c$,1j%[)  
} p@O Ip  
 omg#[  
void CCaptureDlg::SaveBmp() 4 .c1  
{ QOK,-  
 CDC dc; >yKz8SV#  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); E[#VWM I  
 CBitmap bm; ]&H"EHC<$  
 int Width=GetSystemMetrics(SM_CXSCREEN); ;%d<Uk?  
 int Height=GetSystemMetrics(SM_CYSCREEN); Y=|p}>.}  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 2FaCrc/  
 CDC tdc; fZpi+I  
 tdc.CreateCompatibleDC(&dc); J:"@S%gy%  
 CBitmap*pOld=tdc.SelectObject(&bm); <[n:Ij  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 05{}@tW-  
 tdc.SelectObject(pOld); . q -: 3b  
 BITMAP btm; 3 1c*^ZE.  
 bm.GetBitmap(&btm); U2?R&c;b  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [-[59 H[6)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [K,P)V>K  
 BITMAPINFOHEADER bih; }F0<8L6%  
 bih.biBitCount=btm.bmBitsPixel; =r/8~~=  
 bih.biClrImportant=0; ,,G"EF0A  
 bih.biClrUsed=0; ML'y`S  
 bih.biCompression=0; =PY{Elf  
 bih.biHeight=btm.bmHeight; 4Cu\|"5)  
 bih.biPlanes=1; $b2~Wj*-nJ  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]e),#_M  
 bih.biSizeImage=size; "p3<-06  
 bih.biWidth=btm.bmWidth; %y9sC1T  
 bih.biXPelsPerMeter=0; L7{}`O/g7  
 bih.biYPelsPerMeter=0; 6)0.q|Q  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;v\s7y  
 static int filecount=0; n%29WF6Zf  
 CString name; )V~=B]  
 name.Format("pict%04d.bmp",filecount++); s}". po]  
 name=m_Path+name; fZ &  
 BITMAPFILEHEADER bfh; L3HC-  
 bfh.bfReserved1=bfh.bfReserved2=0; y+k^CT/u  
 bfh.bfType=((WORD)('M'<< 8)|'B'); P<Bx1H-z-  
 bfh.bfSize=54+size; O >+=cg  
 bfh.bfOffBits=54; UFT JobU  
 CFile bf; fQC{Lc S  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ awo'#Y2>  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )%S@l<%@?  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); RHBQgD$  
  bf.WriteHuge(lpData,size); *]HnFP  
  bf.Close(); ms5?^kS2O  
  nCount++;  s&pnB  
 } 9s_^?q  
 GlobalFreePtr(lpData); &*" *b\  
 if(nCount==1) LA_{[VWYp>  
  m_Number.Format("%d picture captured.",nCount); \~A qA!)6  
 else ^CLQs;zXE  
  m_Number.Format("%d pictures captured.",nCount); s !?uLSEdb  
  UpdateData(FALSE); "G%</G8M  
} w>9d^kU'  
vVSDPlN;  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) v=iiS}s  
{ Lfi6b%/z  
 if(pMsg -> message == WM_KEYDOWN) iii|;v ]+  
 { ~Z/,o)  
  if(pMsg -> wParam == VK_ESCAPE) _b%)  
   return TRUE; W;=Ae~  
  if(pMsg -> wParam == VK_RETURN) /;(ji?wN  
   return TRUE; nl 'MWP  
 } v.<mrI#?  
 return CDialog::PreTranslateMessage(pMsg); hT1JEu  
} 'I/_vqp@  
[5~mP`He  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ";=!PL  
{ (o IGp  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |?VJf3 A  
  SaveBmp(); -GFZFi  
  return FALSE; ;<Z6Y3>I8  
} H}kSXKO8!8  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ MuOKauYa  
 CMenu pop; 3%?tUt  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); }~+,x#  
 CMenu*pMenu=pop.GetSubMenu(0); 8O]`3oa>  
 pMenu->SetDefaultItem(ID_EXITICON); z mip  
 CPoint pt; 4zS0kk;+  
 GetCursorPos(&pt); =[]6NjKS,  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ciODTq?  
 if(id==ID_EXITICON) 3E*m.jX  
  DeleteIcon(); $2h%IK>#G  
 else if(id==ID_EXIT) E>]K#H  
  OnCancel(); ]Ac}+?  
 return FALSE; l~;>KjZg  
} -MS#YcsV  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]87BP%G  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :sg}e  
 AddIcon(); Dj96t5R  
 return res; )%Fwfb  
} LE<J<~2Z  
24#qg '  
void CCaptureDlg::AddIcon() L>~Tc  
{ .+u b\  
 NOTIFYICONDATA data; 7?R600OA  
 data.cbSize=sizeof(NOTIFYICONDATA); dWQsC|  
 CString tip; GKo&?Tj)  
 tip.LoadString(IDS_ICONTIP); 8-x-?7  
 data.hIcon=GetIcon(0); L_Gw:"-+Q  
 data.hWnd=GetSafeHwnd(); z4SJxL  
 strcpy(data.szTip,tip); *p $0(bz  
 data.uCallbackMessage=IDM_SHELL; K2 M=)B  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =D$ED^W  
 data.uID=98; %a~/q0o>  
 Shell_NotifyIcon(NIM_ADD,&data); 5_'lu  
 ShowWindow(SW_HIDE); &;-zy%#l  
 bTray=TRUE; 4Wiy2  
} <v0`r2^S{-  
RX>P-vp  
void CCaptureDlg::DeleteIcon() 0uDDaFS  
{ #gV n7wq  
 NOTIFYICONDATA data; o0C&ol_  
 data.cbSize=sizeof(NOTIFYICONDATA); 1]G)41  
 data.hWnd=GetSafeHwnd(); q_.fVn:!  
 data.uID=98; d:';s~  
 Shell_NotifyIcon(NIM_DELETE,&data); sRD fA4/TF  
 ShowWindow(SW_SHOW); RJ3oI+gI  
 SetForegroundWindow(); .^{%hc*w4  
 ShowWindow(SW_SHOWNORMAL); WChP,hw  
 bTray=FALSE; hNN[djR  
} /dYv@OU?  
p@G7}'|eyA  
void CCaptureDlg::OnChange() V,_m>$Mo  
{ ) 6)bI.BY  
 RegisterHotkey(); pjFO0h_Y  
} vv ,4n&D  
;_(f(8BO   
BOOL CCaptureDlg::RegisterHotkey() +>q#eUS)  
{ :_R:>n9 p  
 UpdateData();  JaY"Wfc  
 UCHAR mask=0; ^-Od*DTL  
 UCHAR key=0; .}!.4J%q2  
 if(m_bControl) 7_i8'(``  
  mask|=4; Kb?{^\FiU  
 if(m_bAlt) ~'_cBJ 'XD  
  mask|=2; ~+dps i  
 if(m_bShift) ?+d`_/IB  
  mask|=1; U0_^6zd_  
  key=Key_Table[m_Key.GetCurSel()]; 06pvI}   
 if(bRegistered){ _Ub `\ytx  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !e|\1v'0  
  bRegistered=FALSE; G7CeWfS  
 } ls@]%pz.1d  
 cMask=mask; /g<Oh{o8  
 cKey=key; xN-,gT'!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g5B TZZ  
 return bRegistered; |HK:\)L%  
} ZUQ _u  
4 ThFC  
  四、小结 ~w>h#{RB  
sApix=Lr  
  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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