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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: Ex 6o=D2  
  fO #?k<p  
  一、实现方法 ,pn ) >  
9MT3T?IS  
  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: 3#9uEDdE  
#7+]%;h  
#pragma data_seg("shareddata") ^=k {~  
HHOOK hHook =NULL; //钩子句柄 WI6(#8^p  
UINT nHookCount =0; //挂接的程序数目 >ZX|4U[$P  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 jSB'>m]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 q=njKC  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;:U<ce=  
static int KeyCount =0; |IAW{_9)U  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 +Jdm #n?_  
#pragma data_seg() Gp,'kw"I  
/0 _zXQyV  
  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。 (oF-O{  
oQ{cSThj  
  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: =C#*!N73  
`T=1<Twc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR $}db /hY*  
cKey,UCHAR cMask) 9T$u+GX'  
{ Jns/v6  
 BOOL bAdded=FALSE; ]Ym=+lgi  
 for(int index=0;index<MAX_KEY;index++){ +ZX .1[O  
  if(hCallWnd[index]==0){ n6/fan;  
   hCallWnd[index]=hWnd; Mo_$b8i  
   HotKey[index]=cKey; bTiBmS  
   HotKeyMask[index]=cMask; >d97l&W  
   bAdded=TRUE; J)#S-ZB+'k  
   KeyCount++; $]1qbE+  
   break; A0OB$OK  
  } )L >Q;'  
 } e9lOk)`t  
 return bAdded; %;tJQ%6-.S  
} &5d\~{;  
//删除热键 /w0w* n H  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,aWCiu}  
{ T ~h.=5  
 BOOL bRemoved=FALSE; t?HF-zQ  
 for(int index=0;index<MAX_KEY;index++){ } YRO'Q{  
  if(hCallWnd[index]==hWnd){ hox< vr4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j-QGOuvW  
    hCallWnd[index]=NULL; u (AA`S"  
    HotKey[index]=0; IhfZLE.,  
    HotKeyMask[index]=0; cN5"i0xk  
    bRemoved=TRUE; =6fB*bNk]  
    KeyCount--; RbKwO} z$q  
    break; .+HcAx{/2  
   } a>w~FUm*  
  } ?;_O 9  
 } >C*4_J7  
 return bRemoved; nSHNis  
} \WX@PfL  
T=>vh*J  
m d_g}N(C  
  DLL中的钩子函数如下: me:iQ.g  
\+9;!VWhl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) JL``iA  
{ l/ QhD?)9  
 BOOL bProcessed=FALSE; &y\igX1  
 if(HC_ACTION==nCode) (Igu:=  
 { bM^7g  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 zQ_z7FJCB  
   switch(wParam) 2 eHx"Ha  
   {  D?mDG|Z  
    case VK_MENU: "|hlDe<  
     MaskBits&=~ALTBIT; 8+ hhdy*b  
     break; 6#vI;d[^  
    case VK_CONTROL: ` jyKCm.$#  
     MaskBits&=~CTRLBIT; Cg^:jd  
     break; ;t!9]1  
    case VK_SHIFT: ^o bC4(  
     MaskBits&=~SHIFTBIT; ; [FLT:$  
     break; 03Ukw/D&  
    default: //judge the key and send message ly=a>}F_  
     break; H#`8Ey  
   } mqw 84u  
   for(int index=0;index<MAX_KEY;index++){ \C7q4p?8  
    if(hCallWnd[index]==NULL) C bQ4Y  
     continue; pZjpc#*9N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =9<$eLE0  
    { 7DZTQUb"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Z vRxi&Z{?  
     bProcessed=TRUE; C/)`<b(  
    } *E7R(#,yC  
   } + KP_yUq[  
  } fK"iF@=Z`  
  else if((lParam&0xc000ffff)==1){ //有键按下 {[tZ.1.w  
   switch(wParam) #Z0-8<\  
   { (kY@7)d'e  
    case VK_MENU: kT2Wm/L  
     MaskBits|=ALTBIT; {Xv3:"E"O  
     break; TL@mM  
    case VK_CONTROL: ^e%k~B^  
     MaskBits|=CTRLBIT; x 'mF&^  
     break; O"iak  
    case VK_SHIFT: >jKjh!`)!e  
     MaskBits|=SHIFTBIT; _ Mn6L=  
     break; }uiPvO+&p  
    default: //judge the key and send message a ea0+,;  
     break; R>HY:-2  
   } ai9  
   for(int index=0;index<MAX_KEY;index++){ "k, K~@}  
    if(hCallWnd[index]==NULL) U!Mf]3  
     continue; ~of,,&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T%~SM5  
    { 6]ZO'Nwo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9(OAKUQ  
     bProcessed=TRUE; D2]ZMDL.  
    } |]tZ hI"3<  
   } CIy^`2wq  
  } 7>&1nBh. f  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 cm,4&x6  
   for(int index=0;index<MAX_KEY;index++){ QTE:K?  
    if(hCallWnd[index]==NULL) *(Ro;?O,pi  
     continue; *IqVY&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }^9paU  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /=/ HB  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ](nH{aY!  
   } .pW o>`"  
  } nALnB1  
 } qRl/Sl#F  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4m\([EO  
} DJ|BM+  
OfJd/D  
  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: jzMg'z/@J  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3a^)u-9,x  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mw"}8y  
}<&d]N  
  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: Khap9a_q-  
dQK`sLChv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f:XfAH3R{  
{ 5zVQ;;9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0e\y~#-  
 { 1!1DuQ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 wHWma)}-z  
  SaveBmp(); tUv3jq)n%  
  return FALSE; F9O`HFVK  
 } 4|=vxJ  
 …… //其它处理及默认处理 wE4;Rk1  
} vcM~i^24)  
:~er h}~ps  
gCL{Cw  
  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。 <r3Jf}%tT  
W #47Cz  
  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。 ~b#OFnyG  
PT05DH  
  二、编程步骤 ftaBilkjp  
P=Puaz5&{  
  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"; 4i`S+`#  
<5k&)EoT  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; F^miq^K=  
DyIV/  
  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; ;:?*t{r4#  
OW#_ty_ul  
  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; %",ULtZ+  
]zcV]Qj$~  
  5、 添加代码,编译运行程序。 bM5CDzH(#X  
lz}llLb1  
三、程序代码 *l {4lu  
!-ZP*V3}h  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 1@@y]s_.a  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) g&kH'fR8  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ F3 Y<ZbxT  
#if _MSC_VER > 1000 {6:& %V  
#pragma once 3; A$<s  
#endif // _MSC_VER > 1000 |,{+;:  
#ifndef __AFXWIN_H__ c&b/Joi7@  
#error include 'stdafx.h' before including this file for PCH @7-D7  
#endif #w;;D7{@m  
#include "resource.h" // main symbols Vf$1Sjw  
class CHookApp : public CWinApp NZfd_? 3  
{ 'QR4~`6I  
 public: s&0*'^'O[S  
  CHookApp(); j3LNnZY  
  // Overrides u]0!|Jd0  
  // ClassWizard generated virtual function overrides zu<>"5}]  
  //{{AFX_VIRTUAL(CHookApp) :v#8O~  
 public: @ct#s:t  
  virtual BOOL InitInstance(); 2]3G1idB  
  virtual int ExitInstance(); c8q G\\t[  
  //}}AFX_VIRTUAL F'XlJ M  
  //{{AFX_MSG(CHookApp) "h$D7 mL  
  // NOTE - the ClassWizard will add and remove member functions here. xY+A]Up|w  
  // DO NOT EDIT what you see in these blocks of generated code ! a}w&dE$!-  
  //}}AFX_MSG pJn>oGeJ&  
  DECLARE_MESSAGE_MAP() @BXaA0F4  
}; ]o `4Z"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); m EFWo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dX 0x Kk%#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ZRO.bMgZF  
BOOL InitHotkey(); )Yrr%f`\  
BOOL UnInit(); B]i+,u  
#endif "(N-h\7Ex9  
"~Us#4>  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 0OEtU5lf`y  
#include "stdafx.h" 7F~xq#Wi#  
#include "hook.h" 9c%(]Rn:  
#include <windowsx.h> Gy$o7|PA"{  
#ifdef _DEBUG ?o@E1:aA  
#define new DEBUG_NEW 5uzpTNAMM1  
#undef THIS_FILE #|q;t   
static char THIS_FILE[] = __FILE__; .N&QW `  
#endif bu;vpNa  
#define MAX_KEY 100 ]Px:d+wX:  
#define CTRLBIT 0x04 XGL"gD   
#define ALTBIT 0x02 y^ 3,X_0  
#define SHIFTBIT 0x01 R4yJ.f  
#pragma data_seg("shareddata") ,d5ia4\K  
HHOOK hHook =NULL; nMeSCX  
UINT nHookCount =0; S~}$Ly@  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey fq{I$syY  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT {<"[D([  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Mg&HRE  
static int KeyCount =0; }WoX9M; 1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift UX?X]ZYVR  
#pragma data_seg() "1AjCHZ  
HINSTANCE hins; R+C+$?4NG  
void VerifyWindow(); %uF:)   
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) WGluZhRuT3  
//{{AFX_MSG_MAP(CHookApp) N:5b1TdI,  
// NOTE - the ClassWizard will add and remove mapping macros here. WI%zr2T  
// DO NOT EDIT what you see in these blocks of generated code! p<ry$=`  
//}}AFX_MSG_MAP -B",&yTV  
END_MESSAGE_MAP() XPrY`,kN  
MuN [U17FB  
CHookApp::CHookApp() +h9`I/R  
{ !P+~ c0DF  
 // TODO: add construction code here, O'Vh{JHf  
 // Place all significant initialization in InitInstance ?NQD#  
} 6CCZda@  
@ $ 9m>6V  
CHookApp theApp; *'s&/vEy  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?|\0)wrRf  
{ WReYF+Uen  
 BOOL bProcessed=FALSE; aIY$5^x  
 if(HC_ACTION==nCode) 9[B<rz  
 { oVAOGHE  
  if((lParam&0xc0000000)==0xc0000000){// Key up A7mMgb_  
   switch(wParam) VNr!|bp5  
   { 4c~*hMr y  
    case VK_MENU: zaQ$ Ht  
     MaskBits&=~ALTBIT; &IxxDvP3k  
     break; G;87in ,}  
    case VK_CONTROL: 2nVuz9h  
     MaskBits&=~CTRLBIT; @fUX)zm>  
     break; Ey 0>L  
    case VK_SHIFT: W5 M ]  
     MaskBits&=~SHIFTBIT; XT\Td}>  
     break; `1}HWLBX.  
    default: //judge the key and send message # r2$ZCo3o  
     break; %jYQ  
   } 8.6no  
   for(int index=0;index<MAX_KEY;index++){ -<u- +CbuT  
    if(hCallWnd[index]==NULL) Z1 E` I89<  
     continue; O(b"F? w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) KBp!zSl  
    { Z:W')Nd(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u66TrYStG  
     bProcessed=TRUE; 56 /.*qa  
    } ;2+ FgOj  
   } RI7qsm6RN  
  } :5q^\xmmq  
  else if((lParam&0xc000ffff)==1){ //Key down }?\#_BCjx(  
   switch(wParam) sASAsGk<  
   {  dfYYyE  
    case VK_MENU: \k2C 5f  
     MaskBits|=ALTBIT; Nn~tb2\vk  
     break; `HMligT  
    case VK_CONTROL: Te{aB"B  
     MaskBits|=CTRLBIT; ^R&_}bp  
     break; ~GsH8yA_P  
    case VK_SHIFT: 11^ {W F  
     MaskBits|=SHIFTBIT; {m1t~ S   
     break; k:&?$  
    default: //judge the key and send message NXC~#oG  
     break; S}XB |  
   } 1t} (+NNjH  
   for(int index=0;index<MAX_KEY;index++) A= \'r<:  
   { p0%6@_FT~  
    if(hCallWnd[index]==NULL) 0`aHwt/F  
     continue; IeqWR4Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "RR./e)h  
    { uaZ"x& oZ#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ru(?a~lF8~  
     bProcessed=TRUE; q329z>  
    }  (9'G  
   } o}j_eH l{  
  } HZ[68T[8b  
  if(!bProcessed){ %Hh &u .  
   for(int index=0;index<MAX_KEY;index++){ < |]i  
    if(hCallWnd[index]==NULL) Cv?<}q  
     continue; +qu@dU0\`|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) x _YV{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `SSP53R(0  
   } J%O[@jX1  
  } ?[*@T2Ck  
 } Y'+F0IZ+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8xeun~e"vS  
} *R9mgv[  
oK(W)[u  
BOOL InitHotkey() N'Z_6A*-  
{ <*b]JY V@  
 if(hHook!=NULL){ iPtm@f,bI  
  nHookCount++; ps{&WT3a  
  return TRUE; PEwW*4Xo  
 } }(vOaD|k=  
 else ^| a&%wxA  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); lL(}dbT~N  
  if(hHook!=NULL) lhW#IiX  
   nHookCount++; R+@sHsZ@  
  return (hHook!=NULL); qAuUe=w%p  
} s\3Z?zm8  
BOOL UnInit() ux/[d6To  
{ A+bu bH,  
 if(nHookCount>1){ ;{F;e)${M  
  nHookCount--; o#KPrW`XJ/  
  return TRUE; 4,R\3`b  
 } ?L ~=Z\H  
 BOOL unhooked = UnhookWindowsHookEx(hHook); D; 35@gtj  
 if(unhooked==TRUE){ \e5,`  
  nHookCount=0; JVIcNK)  
  hHook=NULL; (0+GLI8  
 } OA8b_k~  
 return unhooked; l,FG:"`Z@  
} SjNwT[.nr7  
aF4V|?+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [ XY:MU e  
{ 7p"~:1hU  
 BOOL bAdded=FALSE; 6m;wO r  
 for(int index=0;index<MAX_KEY;index++){ m%[2x#  
  if(hCallWnd[index]==0){ DlQ[}5STF  
   hCallWnd[index]=hWnd; <}x|@u  
   HotKey[index]=cKey; MIMPJXT#.  
   HotKeyMask[index]=cMask; )MX1776kU  
   bAdded=TRUE; ?-6x]l=]  
   KeyCount++; %lqG*dRx0  
   break; X G@>1/  
  } pN^G[  
 } szM=U$jKq  
 return bAdded; U mx  
} Z({`9+/>u  
m= beB\=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1PT_1[eAR  
{ A?{aUQB~|  
 BOOL bRemoved=FALSE; t9-\x  
 for(int index=0;index<MAX_KEY;index++){ Fy+7{=?^F  
  if(hCallWnd[index]==hWnd){ 3!L<=X  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ E)Zd{9A5)  
    hCallWnd[index]=NULL; Aaw:B?4)  
    HotKey[index]=0; fU){]YP  
    HotKeyMask[index]=0; ;H#R{uR_<  
    bRemoved=TRUE; ]6c2[r?g{  
    KeyCount--; . AQ3zpy5B  
    break; BOl$UJ|K  
   } b3HTCO-,fC  
  } J|64b  
 } _tauhwu  
 return bRemoved; b\uB  
} /Z9`uK  
f+W[]KK*PW  
void VerifyWindow() PTV`=vtj  
{ 7_d#XKz@  
 for(int i=0;i<MAX_KEY;i++){ ;hJ/t/7  
  if(hCallWnd!=NULL){ #lVl?F+~  
   if(!IsWindow(hCallWnd)){ DuC u6j  
    hCallWnd=NULL; snk{u/0Xm  
    HotKey=0; '/"M02a  
    HotKeyMask=0; Qre&N _  
    KeyCount--; tZ{q\+h  
   } kpMM%"=V  
  } r3bvuq,6$  
 } A,CPR0g%  
} 0{Ll4  
pUEok+  
BOOL CHookApp::InitInstance() W&re;?Z{ke  
{  Vgb>3]SU  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); X72X:"  
 hins=AfxGetInstanceHandle(); -H]f@|AOw  
 InitHotkey(); `\FjO"  
 return CWinApp::InitInstance(); o5G"J"vxe  
} s$y#Ufz  
C5n=2luI_  
int CHookApp::ExitInstance() kAF}*&Kzd~  
{ )cmLo0`$  
 VerifyWindow(); kp>Z/kt  
 UnInit(); 36Y[7 m=  
 return CWinApp::ExitInstance(); I z=w2\r  
} Xs,PT  
F>-@LOqHy  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file s\1_-D5]Z  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) FoXQ]X7"  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *L8HC8IbH  
#if _MSC_VER > 1000 HkB<RsS$p_  
#pragma once C- Rie[  
#endif // _MSC_VER > 1000 }c#/1J7  
9TN5|x  
class CCaptureDlg : public CDialog ML"P"&~u6  
{ f?I *`~k  
 // Construction &``oZvu B  
 public: Jt, 4@  
  BOOL bTray; s=@Ce V@4W  
  BOOL bRegistered; Ewsg&CCN  
  BOOL RegisterHotkey(); I\6<)2j/L  
  UCHAR cKey; DT]p14@t9  
  UCHAR cMask; :mHtK)z~  
  void DeleteIcon(); pP oC61F  
  void AddIcon(); ]M"'qC3g  
  UINT nCount; Lj1 @yokB  
  void SaveBmp(); '9Odw@tp  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .`#R%4Xl  
  // Dialog Data `-YSFQ~O,  
  //{{AFX_DATA(CCaptureDlg) DN{G$$or  
  enum { IDD = IDD_CAPTURE_DIALOG }; s ^@Cq=  
  CComboBox m_Key; ?Pw \&q  
  BOOL m_bControl; +\$|L+@Z  
  BOOL m_bAlt; ,ST.pu8N.  
  BOOL m_bShift; M@@O50~  
  CString m_Path; oi4Wxcj  
  CString m_Number; v23Uh2[@Yy  
  //}}AFX_DATA 0!\q  
  // ClassWizard generated virtual function overrides 7Cp_ 41._  
  //{{AFX_VIRTUAL(CCaptureDlg) IGV.0l  
 public: 1>{-wL4rc  
  virtual BOOL PreTranslateMessage(MSG* pMsg); c^gIK1f-  
 protected: 'n#S6.Y:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iC2nHZ*,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); z(68^-V=:  
  //}}AFX_VIRTUAL Ui;s.f  
  // Implementation 5&Kn #  
 protected: ho$%7mc  
  HICON m_hIcon; G QBN-Qv  
  // Generated message map functions jz:c)C&/  
  //{{AFX_MSG(CCaptureDlg) ryLNMh  
  virtual BOOL OnInitDialog(); g'7hc~=  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); { 4{{;   
  afx_msg void OnPaint(); RYaof W  
  afx_msg HCURSOR OnQueryDragIcon(); ]7 mSM  
  virtual void OnCancel(); ~,-O  
  afx_msg void OnAbout(); ^#nWgo7{7  
  afx_msg void OnBrowse(); )#Bfd(F  
  afx_msg void OnChange(); * %BI*p  
 //}}AFX_MSG ,w>?N\w!}  
 DECLARE_MESSAGE_MAP() JLn<,Gn)<\  
}; %"fKZ  
#endif z5'nS&x  
Z-!T(:E]  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [&s:x ,  
#include "stdafx.h" ; O0rt1  
#include "Capture.h" -RDs{c`y%N  
#include "CaptureDlg.h" @ &yj7-]  
#include <windowsx.h> bj{f[nZ d  
#pragma comment(lib,"hook.lib") _\;# a  
#ifdef _DEBUG ?tQv|x  
#define new DEBUG_NEW QLg9aG|  
#undef THIS_FILE Xe+FMbBco  
static char THIS_FILE[] = __FILE__; @23x;x  
#endif =6YO!B>7  
#define IDM_SHELL WM_USER+1 N,$o' \l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); MX\-)e#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W/Q%%)J  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @ xr   
class CAboutDlg : public CDialog 4 Z)]Cq*3  
{ XnOl*#P  
 public: M3`A&*\;  
  CAboutDlg(); R/|{?:r?:x  
  // Dialog Data AE _~DZ:%c  
  //{{AFX_DATA(CAboutDlg) dig76D_[e  
  enum { IDD = IDD_ABOUTBOX };  p ivS8C  
  //}}AFX_DATA  2oASz|  
  // ClassWizard generated virtual function overrides @'4D9A  
  //{{AFX_VIRTUAL(CAboutDlg) r!iuwE@  
 protected: [nD4\x+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support XePBA J  
  //}}AFX_VIRTUAL Jj:4@p:  
  // Implementation +,>bpp1  
 protected: D<6k AGE  
  //{{AFX_MSG(CAboutDlg) #::vMnT  
  //}}AFX_MSG Hp AZ{P7  
  DECLARE_MESSAGE_MAP() *X=-^\G  
}; W7"sWaOhW  
!{;RtUPz*  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *?&O8SSBH  
{ iK:]Q8b  
 //{{AFX_DATA_INIT(CAboutDlg) RVnYe='  
 //}}AFX_DATA_INIT o#6}?g.  
} 6P|neb}  
oFp&j@`k8j  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) sAlgp2-  
{ ztpb/9J9  
 CDialog::DoDataExchange(pDX); k]g\` gc  
 //{{AFX_DATA_MAP(CAboutDlg) {jG`l$$  
 //}}AFX_DATA_MAP ,cEcMaJ  
} gK#w$s50  
8ipLq`)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v%[mt` I  
 //{{AFX_MSG_MAP(CAboutDlg) Q2=~  
 // No message handlers 9Z 4R!Q  
 //}}AFX_MSG_MAP :g";p.~=  
END_MESSAGE_MAP() XU7bWafy  
>m!.l{*j>N  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -2_$zk*n  
: CDialog(CCaptureDlg::IDD, pParent) zPYa@0I  
{ ?2;G_P+  
 //{{AFX_DATA_INIT(CCaptureDlg) )I4tl/  
  m_bControl = FALSE; $n"Llw&)  
  m_bAlt = FALSE; L+L9)8FJ  
  m_bShift = FALSE; 06$9Uz9  
  m_Path = _T("c:\\"); P0=F9`3wb  
  m_Number = _T("0 picture captured."); h@d m:=ul  
  nCount=0; = xk@Q7$  
  bRegistered=FALSE; }1dh/Cc`  
  bTray=FALSE; Tp13V.|  
 //}}AFX_DATA_INIT LAeXe!y  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 DBRJtU!5x  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }dM^6 Kd%  
} qQ_QF  
D6WsEd>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) GZo4uwG@a  
{ <~OyV5:6  
 CDialog::DoDataExchange(pDX); ND>}t#^$  
 //{{AFX_DATA_MAP(CCaptureDlg) _#:1Axx1  
  DDX_Control(pDX, IDC_KEY, m_Key); 0*^Fk=>ej  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); (tvh9 o  
  DDX_Check(pDX, IDC_ALT, m_bAlt); n21J7;\/+  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); lTXU  
  DDX_Text(pDX, IDC_PATH, m_Path); #UQ[8e  
  DDX_Text(pDX, IDC_NUMBER, m_Number); sh1()vT  
 //}}AFX_DATA_MAP U|nk8 6r  
} i}19$x.D`  
,R+u%bmn#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ($kwlj~c  
//{{AFX_MSG_MAP(CCaptureDlg) JSU\Hh!  
 ON_WM_SYSCOMMAND() Y$^\D' .k  
 ON_WM_PAINT() 2OTpGl  
 ON_WM_QUERYDRAGICON() Ipe;%as#  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) S SXSgp  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) E_oe1C:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) U?QO'H 5  
//}}AFX_MSG_MAP rL=$WxdPU  
END_MESSAGE_MAP() j*{bM{~T<  
cx|j _5%i  
BOOL CCaptureDlg::OnInitDialog() l ;uEw  
{ d9(FwmE  
 CDialog::OnInitDialog(); zBbTj IFQ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?*4zNhL  
 ASSERT(IDM_ABOUTBOX < 0xF000); "^H+A-R[  
 CMenu* pSysMenu = GetSystemMenu(FALSE); zjmc>++<t  
 if (pSysMenu != NULL) jo ^*R'}  
 { $gNCS:VG*  
  CString strAboutMenu; sAN#j {  
  strAboutMenu.LoadString(IDS_ABOUTBOX); [H1NP'Kg]  
  if (!strAboutMenu.IsEmpty()) VA0TY/{ ]  
  { !Xm:$KH  
   pSysMenu->AppendMenu(MF_SEPARATOR); 7}Sw(g)o7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Q$%@.@  
  } c.fj[U|j  
 } "{k3~epYaN  
 SetIcon(m_hIcon, TRUE); // Set big icon O,cx9N  
 SetIcon(m_hIcon, FALSE); // Set small icon ($wYaw z  
 m_Key.SetCurSel(0); ;IT^SHym  
 RegisterHotkey(); #d~"bn q;c  
 CMenu* pMenu=GetSystemMenu(FALSE); c nzPq\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); oC [g  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); u2t<auE9^  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); R|suBF3  
 return TRUE; // return TRUE unless you set the focus to a control jhLh~. 8  
} D&shrKFx  
m{*l6`dF  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 61'7b`:(hi  
{ ?,j:Y0l.L  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) B:4u 2/!5  
 { [Z 0 e$  
  CAboutDlg dlgAbout; .\VjS^o&Z&  
  dlgAbout.DoModal(); v!,O7XGH~  
 } _KFKx3<m!  
 else (; "ICk&  
 { <LJ$GiU  
  CDialog::OnSysCommand(nID, lParam); A-W7!0  
 } +3C S3fTq  
} JG[+e*8  
6voK{C4J  
void CCaptureDlg::OnPaint() o$-P hl  
{ g_=Q=y@,  
 if (IsIconic()) C$bK!]a  
 { [Ue>KG62=  
  CPaintDC dc(this); // device context for painting z,9qAts?mh  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &[YG\8sxWa  
  // Center icon in client rectangle gvC2\k{  
  int cxIcon = GetSystemMetrics(SM_CXICON); -4Xr5j%o  
  int cyIcon = GetSystemMetrics(SM_CYICON);  lcr=^  
  CRect rect; )oj`K,#  
  GetClientRect(&rect); <n>< A+D  
  int x = (rect.Width() - cxIcon + 1) / 2; M(|gfsD  
  int y = (rect.Height() - cyIcon + 1) / 2; ^T5c^ M8o  
  // Draw the icon ym KdRF  
  dc.DrawIcon(x, y, m_hIcon); $H#&.IjY  
 } h+Dok#g  
 else 1Jahu!c?  
 { ?d %_o@  
  CDialog::OnPaint(); 2d._X$fx7  
 } 0XYxMN)  
} Cdv TC`~,  
*f(}@U  
HCURSOR CCaptureDlg::OnQueryDragIcon() aQ)9<LsI  
{ `drvu?F  
 return (HCURSOR) m_hIcon; )6(mf2&  
} ~_raI7,  
/eI38>v  
void CCaptureDlg::OnCancel() /nrDU*  
{ WFkXz*7B  
 if(bTray) Pwq} ;+  
  DeleteIcon(); OD i)#  
  CDialog::OnCancel(); {M$1?j"7  
} ; etH)  
DGU$3w  
void CCaptureDlg::OnAbout() '~@WJKk  
{ yqK82z5U*R  
 CAboutDlg dlg; p])km%zB(  
 dlg.DoModal(); )S%mKdOm $  
} t`LH\]6@  
xWDwg@ P  
void CCaptureDlg::OnBrowse() ?*T`a oB  
{ +z4NxR   
 CString str; ?832#a?FZ;  
 BROWSEINFO bi; pS%Az)3RZ  
 char name[MAX_PATH]; k @ Hu0x  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); &8;mcM//4  
 bi.hwndOwner=GetSafeHwnd(); ENGw <  
 bi.pszDisplayName=name; &~k/G  
 bi.lpszTitle="Select folder"; 6wF ?FtT  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8\yH 7H  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #*9*[Xbi  
 if(idl==NULL) K9*K4'#R  
  return; B8 2A:t)  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); snyx$Qx(  
 str.ReleaseBuffer(); D^A_0@  
 m_Path=str; ZFRKh:|  
 if(str.GetAt(str.GetLength()-1)!='\\') ^Dh2_vbI  
  m_Path+="\\"; mb&b=&  
 UpdateData(FALSE); 89L -k%R  
} TWn7&,N  
V{"5)Ly?fu  
void CCaptureDlg::SaveBmp() ^|8cS0dK]Q  
{ H[Qh*pq2  
 CDC dc; 3Mdg&~85  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Y)uNzb6R  
 CBitmap bm; #>233<  
 int Width=GetSystemMetrics(SM_CXSCREEN); 9`b*Y*d  
 int Height=GetSystemMetrics(SM_CYSCREEN); iBZ+gsSP  
 bm.CreateCompatibleBitmap(&dc,Width,Height); k<:!^_3H  
 CDC tdc; `xtN+y F  
 tdc.CreateCompatibleDC(&dc); c`iSe$eS  
 CBitmap*pOld=tdc.SelectObject(&bm); .D7\Hao  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); N8KHNTb-M  
 tdc.SelectObject(pOld); *kDXx&7B$  
 BITMAP btm; uZqo"  
 bm.GetBitmap(&btm); x$Lt?'  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; qOng?(I  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); IlaH,J7n  
 BITMAPINFOHEADER bih; sx/g5 ?zh  
 bih.biBitCount=btm.bmBitsPixel; I\[*vgjm3G  
 bih.biClrImportant=0; vbSz&+52;  
 bih.biClrUsed=0; >z( 6ADq  
 bih.biCompression=0; fxc~5~$>  
 bih.biHeight=btm.bmHeight; < *XC`Ii  
 bih.biPlanes=1; |5O%@  
 bih.biSize=sizeof(BITMAPINFOHEADER); wi9fYfuv3R  
 bih.biSizeImage=size; >8RIMW2  
 bih.biWidth=btm.bmWidth; x.d9mjLN8m  
 bih.biXPelsPerMeter=0; Jb0]!*tV  
 bih.biYPelsPerMeter=0; p1 o?^A&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); wo?C 7,-x  
 static int filecount=0; [rQ#skf  
 CString name; V,>#!zUv  
 name.Format("pict%04d.bmp",filecount++); (OJ}|*\e  
 name=m_Path+name; @]OI(B  
 BITMAPFILEHEADER bfh; {t9U]hX%A[  
 bfh.bfReserved1=bfh.bfReserved2=0; )Dv"seH.  
 bfh.bfType=((WORD)('M'<< 8)|'B'); D,X$66T ^  
 bfh.bfSize=54+size; x{+rx.  
 bfh.bfOffBits=54; 1pc|]9B  
 CFile bf; Z3S\@_/;  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ mhcJ0\@_  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); eqLETo@} *  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); GM@TWwG-B  
  bf.WriteHuge(lpData,size);  R,y8~D  
  bf.Close(); SBYRN##n_  
  nCount++; /R^!~J50  
 } s$RymM  
 GlobalFreePtr(lpData); 6jKM,%l  
 if(nCount==1) 3Hq0\Y"Y  
  m_Number.Format("%d picture captured.",nCount); {"@Bf<J#  
 else Uz1u6BF  
  m_Number.Format("%d pictures captured.",nCount); 1Ce:<.99B  
  UpdateData(FALSE); i~\gEMaO  
} M>0~Ek%3  
xE+Go  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @w2}WX>  
{ U;;Har   
 if(pMsg -> message == WM_KEYDOWN) zO!`sPP  
 { JhuK W>7  
  if(pMsg -> wParam == VK_ESCAPE) IPJs$PtKok  
   return TRUE; Z-:$)0f  
  if(pMsg -> wParam == VK_RETURN) *gBaF/C  
   return TRUE; u_mm*o~)g  
 } 4I,HvP  
 return CDialog::PreTranslateMessage(pMsg); fF>H7  
} qT}&XK`Q^  
2*Gl|@~N  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +[z(N  
{ jP+4'O!s[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ;&[0 h)  
  SaveBmp(); N["(ZSS   
  return FALSE; J :,  
} <nIU]}q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ n)pBK>+  
 CMenu pop; uZ OUp8QQ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); pKp#4Js  
 CMenu*pMenu=pop.GetSubMenu(0); L!{^^7  
 pMenu->SetDefaultItem(ID_EXITICON); J@1(2%)|Z  
 CPoint pt; 4,)=r3;&!  
 GetCursorPos(&pt); y 5=J6a2.  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); !rrjA$P<v  
 if(id==ID_EXITICON) u} KiSZxt  
  DeleteIcon(); I</Nmgf  
 else if(id==ID_EXIT) ECl[v%R/6  
  OnCancel(); t7lRMCN  
 return FALSE; ,ll!19y  
} fV[xv4D.  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ` 3<#DZ;!  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) &9^c-;Vs  
 AddIcon(); GZO,]%z  
 return res;  f0:)  
} ZtIK"o-|!  
L@v0C)  
void CCaptureDlg::AddIcon() {x-g?HB  
{ k 9s3@S  
 NOTIFYICONDATA data; Xst&QKU  
 data.cbSize=sizeof(NOTIFYICONDATA); 4CNK ]2  
 CString tip; .p0;y3so4  
 tip.LoadString(IDS_ICONTIP); Ws(BouJ  
 data.hIcon=GetIcon(0); iPE-j#|  
 data.hWnd=GetSafeHwnd();  {!x-kF_  
 strcpy(data.szTip,tip); v^KJU +  
 data.uCallbackMessage=IDM_SHELL; kV-a'"W5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; R$PiF1ffj  
 data.uID=98; bv|v9_i  
 Shell_NotifyIcon(NIM_ADD,&data); O:D`6U+0  
 ShowWindow(SW_HIDE); ULsz<Hj  
 bTray=TRUE; ~PS%^zxyn  
} Oi7:J> [  
qf ]ax!bK  
void CCaptureDlg::DeleteIcon() {'{ssCL  
{ g%^Zq"  
 NOTIFYICONDATA data; h~<#1'/<  
 data.cbSize=sizeof(NOTIFYICONDATA); .llAiv  
 data.hWnd=GetSafeHwnd(); rJZ-/]Xf!6  
 data.uID=98; [D /q%  
 Shell_NotifyIcon(NIM_DELETE,&data); mz/KGZ5t  
 ShowWindow(SW_SHOW); |n]^gTJt  
 SetForegroundWindow(); oq;}q  
 ShowWindow(SW_SHOWNORMAL); t XfB.[U  
 bTray=FALSE; {K:/(\  
} 8B\,*JGY2  
3):7mE(  
void CCaptureDlg::OnChange() I8?egDkk  
{ 6:QJ@j\  
 RegisterHotkey(); r\L:JTZ$  
} 0z\=uQ0  
23+>K  
BOOL CCaptureDlg::RegisterHotkey() 40+E#z)  
{ 48w3gye  
 UpdateData(); m@"!=CTKd  
 UCHAR mask=0; 1eK J46W  
 UCHAR key=0; e?F r/n  
 if(m_bControl) X/'B*y'=U  
  mask|=4; ?jb7Oq#[  
 if(m_bAlt) LgB}!OLQ  
  mask|=2; q-p4k`]  
 if(m_bShift) >Utn[']~  
  mask|=1; D|UDLaz~  
  key=Key_Table[m_Key.GetCurSel()]; <:/V`b3a  
 if(bRegistered){ >>&~;PG[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Hs2L$TX  
  bRegistered=FALSE; XbG=H-|  
 } l$PO!JRD  
 cMask=mask; |RHX2sso  
 cKey=key; $8X?|fV)  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); vChkSY([  
 return bRegistered; #16)7  
} vE{QN<6T  
%lEPFp  
  四、小结 YIjBKh  
x4fLe5xv  
  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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