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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: 8Q4yllv4  
  Qv~lH&jG  
  一、实现方法 B OKY X  
*: }9(8d  
  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: $MhfGMk!'  
b*Sw") #  
#pragma data_seg("shareddata") n%X5TJE  
HHOOK hHook =NULL; //钩子句柄 .Yg7V'R1  
UINT nHookCount =0; //挂接的程序数目 WCRGqSr4  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 +`=rzL"0I7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ~+ [T{{  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 1L3 +KD~  
static int KeyCount =0; >sGIpER7  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @|N{E I  
#pragma data_seg() 2K wr=t  
@` 5P^H7  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 *QH~ z2:[  
xU9T8Lw  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 5d|hP4fEc  
<aSjK#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  2:GS(%~  
cKey,UCHAR cMask) t[}&*2"$/  
{ DXyRNE<G[C  
 BOOL bAdded=FALSE; 4f SG c8  
 for(int index=0;index<MAX_KEY;index++){ o@2Y98~Q}  
  if(hCallWnd[index]==0){ \8Y62  
   hCallWnd[index]=hWnd; &uP,w#  
   HotKey[index]=cKey; eU(cn8/}  
   HotKeyMask[index]=cMask; 7G':h0i8  
   bAdded=TRUE; %/.yGAPkx  
   KeyCount++; _O#R,Y2#  
   break; vX30Ijm  
  } l\t g.O~  
 } *E.uqu>I  
 return bAdded; b@X+vW{S  
} b=+3/-d  
//删除热键 T$!Pkdh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) BMi5F?Q'G  
{ 5LaF'>1yY  
 BOOL bRemoved=FALSE; xlIVLv6dO  
 for(int index=0;index<MAX_KEY;index++){ dj-/%MU  
  if(hCallWnd[index]==hWnd){ T\v~"pMu*0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &a8%j+j  
    hCallWnd[index]=NULL; zt!)7HBo  
    HotKey[index]=0; =W[M=_0u  
    HotKeyMask[index]=0; JIatRc?g  
    bRemoved=TRUE; !(A<  
    KeyCount--; gk hmQd  
    break; FeL!%z  
   } ?uh%WN6nU]  
  } =[do([A  
 } adY ,Nz  
 return bRemoved; %_ (Xn  
} {&TP&_|H  
9s4>hw@u  
{iXQUj  
  DLL中的钩子函数如下: )6b`1o!7  
__%){j6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3;?DKRIcX  
{ GahIR9_2  
 BOOL bProcessed=FALSE; l3N '@GO  
 if(HC_ACTION==nCode) 'r'+$D7  
 { UX24*0`\~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 d~qZ;uw  
   switch(wParam) HC!5AJ&+}v  
   {  7<0oK|~c#  
    case VK_MENU: y?'Z'  
     MaskBits&=~ALTBIT; @+>t]jyz  
     break; s{uSU1lQn  
    case VK_CONTROL: b?,''t  
     MaskBits&=~CTRLBIT; JuDadIrd{  
     break; }Jo}K) >!  
    case VK_SHIFT: fA)4'7UT  
     MaskBits&=~SHIFTBIT; K?@x'q1  
     break; O^Y@&S RrQ  
    default: //judge the key and send message =xjt PmZ5X  
     break; Esdv+f}4;  
   } _a\$uVZ  
   for(int index=0;index<MAX_KEY;index++){ * `3+x  
    if(hCallWnd[index]==NULL) Owz>g4l r  
     continue; |33_="  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T_j0*A $  
    { B-p ].  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @yNCWa~N  
     bProcessed=TRUE; Z{^Pnit  
    } RPw1i*  
   } ("s!t?!&YS  
  } a|-B#S  
  else if((lParam&0xc000ffff)==1){ //有键按下 V~7Oa2'#B  
   switch(wParam) ffy,ds_7  
   { g?rK&UTU  
    case VK_MENU: 0ZJrK\K;  
     MaskBits|=ALTBIT; 6m0- he~  
     break; 9Xe|*bT  
    case VK_CONTROL: 9~v#]Q}Z}4  
     MaskBits|=CTRLBIT; uoq|l  
     break; Iu ve~ugO  
    case VK_SHIFT: xzw2~(lo  
     MaskBits|=SHIFTBIT; 0zpA<"S  
     break; b"(bT6XO!  
    default: //judge the key and send message Ssd7]G+n:  
     break; !DBaC%TGC  
   } Wb#ON|.2  
   for(int index=0;index<MAX_KEY;index++){ Yb348kRF  
    if(hCallWnd[index]==NULL) /Py`a1  
     continue; ]]hsLOM]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EouI S2e;a  
    { `svOPB4C'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); V^kl_!@  
     bProcessed=TRUE; w|U 7pUz  
    } IAd[_<9D  
   } P\3H<?@4  
  } NKYHJf2?x  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 QV8;c^EZ  
   for(int index=0;index<MAX_KEY;index++){ uA%cie  
    if(hCallWnd[index]==NULL) 08z?i  
     continue; `08}y*E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JqK-vvI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }g"K\x:Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 T^@P.zX  
   } `aL4YH-v  
  } `L @`l  
 } |?LUt@r;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *#Iqz9X.Y3  
} ug?#Oa  
^,#MfF6  
  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: "|GX%> /  
-:Jn|=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]m\:XhI*<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b`^mpB*6R  
?Lem|zo  
  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: oF.H?lG7`  
$yZ(ws  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9R N ge;*  
{ KV|ywcGhT  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) xHaoSs*C9  
 { i>PKE.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 yb-/_{Y  
  SaveBmp(); eR!K8W  
  return FALSE; d=a$Gd_$  
 } +pjU4>)  
 …… //其它处理及默认处理 -O6\!Wo=-  
} aFDCVm%U|  
*h~(LH"tN  
VMW<?V 2Z  
  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。 hQ Lh}}B  
g?9%_&/})A  
  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。 JT*Pm"}  
~!ICBF~j  
  二、编程步骤 vb2aj!8_?  
Y#fiJ  
  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"; h<FEe~  
[zhcb+^5l  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; O;RNmiVoq  
8zH/a   
  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; UpqDGd7M  
}\d3   
  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; $F~hL?"?  
UY&DXIPM  
  5、 添加代码,编译运行程序。 (=w ff5U  
0@2pw2{Ru  
三、程序代码 hJ0m;j&4y  
Yd$64d7,h  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL N0&#fXO  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) nXxSv~r  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5h>t4 [~  
#if _MSC_VER > 1000 z<s4-GJ)?  
#pragma once v QL)I  
#endif // _MSC_VER > 1000 #mbl4a  
#ifndef __AFXWIN_H__ !' jXN82  
#error include 'stdafx.h' before including this file for PCH FUKE.Uxd  
#endif m NApFwZ  
#include "resource.h" // main symbols >Av%[G5=h#  
class CHookApp : public CWinApp Tp%4{U/0`  
{ .E0*lem'hE  
 public: ^g*/p[  
  CHookApp(); <=&7*8u0+  
  // Overrides G+l9QaFv  
  // ClassWizard generated virtual function overrides +ywd(Tuzm  
  //{{AFX_VIRTUAL(CHookApp) U4,hEnJBT  
 public: nuX W/7M  
  virtual BOOL InitInstance(); -~imxPmZ  
  virtual int ExitInstance(); Y^CbpG&-vC  
  //}}AFX_VIRTUAL XrQS?D `  
  //{{AFX_MSG(CHookApp) f>C|qDmT  
  // NOTE - the ClassWizard will add and remove member functions here. e3{L%rQE  
  // DO NOT EDIT what you see in these blocks of generated code ! _Rnq5y  
  //}}AFX_MSG Ab f=b<bu  
  DECLARE_MESSAGE_MAP() a3oSSkT  
}; m&Lc."  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);  kn|z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rFR2c?j8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M)!:o/!cS  
BOOL InitHotkey(); s\ i.pd:Q  
BOOL UnInit(); %]@K}!)2  
#endif DwC8?s*2H  
z/t:gc.  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. /WI HG0D  
#include "stdafx.h" 7<%Rx19L*  
#include "hook.h"  LYX\#  
#include <windowsx.h> hy|X(m  
#ifdef _DEBUG 7&9'=G  
#define new DEBUG_NEW wq"AWyu  
#undef THIS_FILE D^H<)5d9  
static char THIS_FILE[] = __FILE__; 1MzOHE  
#endif Rd.[8#7VE  
#define MAX_KEY 100 G0eJ<*|_ 3  
#define CTRLBIT 0x04 g_w4}!|  
#define ALTBIT 0x02 s% ~p?_P   
#define SHIFTBIT 0x01 U[8Cg  
#pragma data_seg("shareddata") ()+;KF8  
HHOOK hHook =NULL; @7 *Ag~MRb  
UINT nHookCount =0; er0ClvB  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey A4W61f  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT v]HiG_C  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey U%na^Wu  
static int KeyCount =0; -/ #tQ~{gs  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift <ArP_! `3  
#pragma data_seg() C&ivjFf  
HINSTANCE hins; v`$9;9  
void VerifyWindow(); WtTwY8HC  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) X*'-^WM6  
//{{AFX_MSG_MAP(CHookApp) ~ ]q^Akq  
// NOTE - the ClassWizard will add and remove mapping macros here. W[3)B(Vq<E  
// DO NOT EDIT what you see in these blocks of generated code! kM\O2 ay  
//}}AFX_MSG_MAP uz+b  
END_MESSAGE_MAP() hrRX=  
~f2zMTI|  
CHookApp::CHookApp() VNbq]L(g  
{ <P3r}|K  
 // TODO: add construction code here, ~!!>`x  
 // Place all significant initialization in InitInstance -W+67@(\8H  
} :=tPC A=  
a4}2^K  
CHookApp theApp; _r|$H_#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) M_4g%uHG  
{ uOrvmb  
 BOOL bProcessed=FALSE; W+~ w  
 if(HC_ACTION==nCode) z,oqYU\:  
 { wQ,RZO3  
  if((lParam&0xc0000000)==0xc0000000){// Key up "ppT<8Qi'  
   switch(wParam) {P#&e>)v{  
   { RfB""b8]=  
    case VK_MENU: E#FyL>:.h  
     MaskBits&=~ALTBIT; ?s5zTT0U>$  
     break; SJ-g2aAT  
    case VK_CONTROL: hoihdVjv  
     MaskBits&=~CTRLBIT; 97Qng*i  
     break; X?.bE!3=  
    case VK_SHIFT: GJItGq`)  
     MaskBits&=~SHIFTBIT; (r.{v@h,dV  
     break; m!:7ur:Y  
    default: //judge the key and send message >1tGQ cg  
     break; 3Fn26Ri j  
   } 7 v<$l  
   for(int index=0;index<MAX_KEY;index++){ #?i#q%q  
    if(hCallWnd[index]==NULL) y=\jQ6Fc  
     continue; [j0I}+@4H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) BifA&o%  
    { oA~m*|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %1]2+_6  
     bProcessed=TRUE; l1N{ujM  
    } .>?["e#,  
   } = sIR[V'(  
  } 9hT^Y,c0  
  else if((lParam&0xc000ffff)==1){ //Key down y+?tUSPP  
   switch(wParam) IR%a+;Xs  
   { 9kP!O_  
    case VK_MENU: 7-ba-[t#A  
     MaskBits|=ALTBIT; 9VN@M  
     break; h ;5 -X7  
    case VK_CONTROL: +c\s%Gzrh  
     MaskBits|=CTRLBIT; "ngYh]Git$  
     break; KW&&AuPb}  
    case VK_SHIFT: WytCc>oL  
     MaskBits|=SHIFTBIT; tT yu,%/m  
     break; .KT+,Y  
    default: //judge the key and send message c)SSi@< cv  
     break; .tN)H1.:B  
   } 2>O2#53ls0  
   for(int index=0;index<MAX_KEY;index++) ;.W0Aa  
   { [`fq4Ky  
    if(hCallWnd[index]==NULL) "\BP+AF  
     continue; Whd4-pR8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }C7tlA8,7  
    { ^l^_K)tw*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #s#z@F  
     bProcessed=TRUE; 2ZtqZ64i  
    } 9zO3KT2  
   } Lx?bO`=qg7  
  } L238l  
  if(!bProcessed){ e|Sg?ocR  
   for(int index=0;index<MAX_KEY;index++){ `z` `d*_  
    if(hCallWnd[index]==NULL) @mJN  
     continue; .3|9 ~]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kFM'?L&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {|xwvTl J  
   } G>mgoN  
  }  A ]U]  
 } 0dkM72p  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @LL&ggV?  
} R[&lk~a{=  
4!k={Pd  
BOOL InitHotkey() fe37T@  
{ EkSTN  
 if(hHook!=NULL){ Lf0Hz")  
  nHookCount++; #]eXI $HP  
  return TRUE; EJWMr`zdn  
 } rY!uc!  
 else DAu|`pyC%  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Xq>e]#gR  
  if(hHook!=NULL) pXFNK" jm  
   nHookCount++; kw-/h+lG  
  return (hHook!=NULL); DQlaSk4hF_  
} b7AuKY{L  
BOOL UnInit() HnP;1Gi  
{ oLr"8R\d>t  
 if(nHookCount>1){ !W%HAlUAG[  
  nHookCount--; 4(aesZ8h  
  return TRUE; 7-o=E=  
 } iQ9#gPk_9  
 BOOL unhooked = UnhookWindowsHookEx(hHook); U[A*A^$c}  
 if(unhooked==TRUE){ <Z m ,q}  
  nHookCount=0; gv[7h'}<  
  hHook=NULL; l(]\[}.5  
 } "j a0,%3  
 return unhooked; ZHC sv]l  
} [QZ~~(R  
2/7=@>|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %o"Rcw|  
{ [BQw$8 +n_  
 BOOL bAdded=FALSE; gs8L/veP  
 for(int index=0;index<MAX_KEY;index++){ K%pmE?%,8  
  if(hCallWnd[index]==0){ #dpt=  
   hCallWnd[index]=hWnd; q5vs;,_ |  
   HotKey[index]=cKey; /2@%:b)  
   HotKeyMask[index]=cMask; >|Jw,,uf  
   bAdded=TRUE; 4|$D.`Wu  
   KeyCount++; 0[1 !K&(L  
   break; d(@A  
  } m@O\Bi}=}  
 } 9wq%Fnt  
 return bAdded; L\Jl'r|  
} Pm1 " 0  
@Qs-A^.  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1=;QWb6  
{ m|]^f;7z  
 BOOL bRemoved=FALSE; Z@[,"{Sn  
 for(int index=0;index<MAX_KEY;index++){ :>X7(&j8  
  if(hCallWnd[index]==hWnd){ I }/Oi]jA6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 'd t}i<  
    hCallWnd[index]=NULL; Y;&#Ur8q  
    HotKey[index]=0; M)J*Df0@  
    HotKeyMask[index]=0; ^X&9"x)4  
    bRemoved=TRUE; \W}EyA  
    KeyCount--; lTB!yF.r|  
    break; wFJK!9KA8  
   } pt4xUu{  
  } %UQ{'JW?K  
 } ,oG"wgf  
 return bRemoved; zJnVO$A'  
} }=|ZEhtOp  
KvD$`"L/CT  
void VerifyWindow() {cv;S2  
{ _#gsR"FZ$  
 for(int i=0;i<MAX_KEY;i++){ 7k\7G=  
  if(hCallWnd!=NULL){ lXPn]iLJ  
   if(!IsWindow(hCallWnd)){ 4 P;O8KA5y  
    hCallWnd=NULL; `{wku@  
    HotKey=0; Hxl,U>za#  
    HotKeyMask=0; T8441qo{>  
    KeyCount--; <dN=d3S  
   } iCK$ o_`?  
  } O5{XT]:  
 } u.[JYZ  
} V1:3  
vUK>4^{J5  
BOOL CHookApp::InitInstance() <kSaSW  
{ h]Oplp4 \W  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); :7ngVc  
 hins=AfxGetInstanceHandle(); # 0!IUSa  
 InitHotkey(); "B}08C,?  
 return CWinApp::InitInstance(); O0{  
} U]D.z}0  
K%}I}8M  
int CHookApp::ExitInstance() Q#Y3%WF  
{ =| !~0O  
 VerifyWindow(); ~1'468  
 UnInit(); U9 59=e  
 return CWinApp::ExitInstance(); cx,A.Lc  
} K D-_~uIF  
PbPP1G')  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]= NYvv>H  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Dq?HUb^X  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ +zdkdS,2<  
#if _MSC_VER > 1000 7S2F^,w  
#pragma once |+:ZO5FaO  
#endif // _MSC_VER > 1000 +=h!?<*C8  
oPy zk7{  
class CCaptureDlg : public CDialog ]R{"=H'  
{ J3x7i8  
 // Construction na3kHx@  
 public: @L!#i*> 9  
  BOOL bTray; W[>TqT63  
  BOOL bRegistered; |I}+!DDuv  
  BOOL RegisterHotkey(); SU'1#$69F  
  UCHAR cKey; YhT1P fl  
  UCHAR cMask; nh=Us^xD  
  void DeleteIcon(); arLl8G[  
  void AddIcon(); (<C%5xk  
  UINT nCount; 6h_k`z  
  void SaveBmp(); 'Xl>,\'6  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 0:Y`#0qK  
  // Dialog Data <u?hdwW \  
  //{{AFX_DATA(CCaptureDlg) \.1b\\  
  enum { IDD = IDD_CAPTURE_DIALOG }; #@6L|$iX  
  CComboBox m_Key; c2\vG  
  BOOL m_bControl; )Zf}V0!?+  
  BOOL m_bAlt; N#)VD\m  
  BOOL m_bShift; G`#gV"PlC  
  CString m_Path; 4_%FSW8-  
  CString m_Number; L[G\+   
  //}}AFX_DATA 5SL>q`t.bd  
  // ClassWizard generated virtual function overrides pInWKj[y1  
  //{{AFX_VIRTUAL(CCaptureDlg) ePRMv  
 public: {}o>ne nx\  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -fx88  
 protected: O|&TL9:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U9o*6`"o  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Hs}"A,V  
  //}}AFX_VIRTUAL ]A]E)*  
  // Implementation 70 UgKE  
 protected: !(_xu{(DL  
  HICON m_hIcon; 7 3z Y^ x  
  // Generated message map functions 9H}iX0O  
  //{{AFX_MSG(CCaptureDlg) A4Q)YY9~  
  virtual BOOL OnInitDialog(); 6+;2B<II  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); iB3 +KR  
  afx_msg void OnPaint(); f5b`gvCY,#  
  afx_msg HCURSOR OnQueryDragIcon(); %H}Y]D~R  
  virtual void OnCancel(); Mto~ /  
  afx_msg void OnAbout(); !$xEX,vj|W  
  afx_msg void OnBrowse(); N^yO- xk  
  afx_msg void OnChange(); wwcwYPeg  
 //}}AFX_MSG a^T4\  
 DECLARE_MESSAGE_MAP()  q3-;}+  
}; /^33 e+j  
#endif fd"~[ z[  
_Q}RElA  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9;Pu9s[q2  
#include "stdafx.h" ls "\YSq$  
#include "Capture.h" V=4u7!ha  
#include "CaptureDlg.h" ;k&k#>L!K  
#include <windowsx.h> Vc52s+7=8  
#pragma comment(lib,"hook.lib") b)hOzx  
#ifdef _DEBUG HA.NZkq.tV  
#define new DEBUG_NEW EOnp!]Y  
#undef THIS_FILE Pv-V7`{  
static char THIS_FILE[] = __FILE__; lzy$.H"W  
#endif DET!br'z5  
#define IDM_SHELL WM_USER+1 VtzmY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0HJqsSZ$mW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Go+xL/f  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; F}B/-".^  
class CAboutDlg : public CDialog Ddl% V7  
{ 7YXXkdgbd  
 public: 'oiD#\t4  
  CAboutDlg(); k *;{n8o?)  
  // Dialog Data Sp~Gv>uMK  
  //{{AFX_DATA(CAboutDlg) FX|lhwmc(  
  enum { IDD = IDD_ABOUTBOX }; KpbZnW}g  
  //}}AFX_DATA FSwgPIO>  
  // ClassWizard generated virtual function overrides aBVEk2 p  
  //{{AFX_VIRTUAL(CAboutDlg) 3@F+E\k  
 protected: c7l!G~yx'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support So\|Ye  
  //}}AFX_VIRTUAL X|damI%  
  // Implementation !Zyx$2K  
 protected: e7bT%h9i  
  //{{AFX_MSG(CAboutDlg) &^ 3~=$  
  //}}AFX_MSG ?` eYW Z">  
  DECLARE_MESSAGE_MAP() 9{UP)17  
}; `/wq3+?  
/,!7jF:  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) n#^?X  
{ H8<7#  
 //{{AFX_DATA_INIT(CAboutDlg) :&1=8^BY  
 //}}AFX_DATA_INIT nA_ zP4  
} A D}}>v  
kk /+Vx~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %j[LRY/  
{ YK w!pu=  
 CDialog::DoDataExchange(pDX); ZLN_,/7  
 //{{AFX_DATA_MAP(CAboutDlg) 1^60I#Vr@  
 //}}AFX_DATA_MAP  ny  
} 3dX=xuQ%/  
@1/}-.(n  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) jgo<#AJ/E  
 //{{AFX_MSG_MAP(CAboutDlg) f.$aFOn  
 // No message handlers cJHABdK-  
 //}}AFX_MSG_MAP }*B qi7E>  
END_MESSAGE_MAP() KXx@ {cv  
PQ&Q71  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /_:T\`5uO  
: CDialog(CCaptureDlg::IDD, pParent) DUuC3^R  
{ {glqWFT  
 //{{AFX_DATA_INIT(CCaptureDlg) A"BtVy[[9  
  m_bControl = FALSE; V6z@"+  
  m_bAlt = FALSE; v/aPiFlw  
  m_bShift = FALSE; KT lP:pB;  
  m_Path = _T("c:\\"); *m| t =9E  
  m_Number = _T("0 picture captured."); D*XZT{1g  
  nCount=0; g]==!!^<D  
  bRegistered=FALSE; 0?6 If+AC  
  bTray=FALSE; :?$Sb8OuIL  
 //}}AFX_DATA_INIT ){:q;E]^fB  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 47C(\\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 3I;xU(rv  
} a*W_fxb  
%<=w[*i  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) .o\;,l2  
{ /Oq)3fU e  
 CDialog::DoDataExchange(pDX); 4Wi8 $  
 //{{AFX_DATA_MAP(CCaptureDlg)  9+'@  
  DDX_Control(pDX, IDC_KEY, m_Key); M|[@znzR<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); h+B'_ `(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 5D]30  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Fi?32e4KI5  
  DDX_Text(pDX, IDC_PATH, m_Path); bRK CY6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); '&.)T 2Kw  
 //}}AFX_DATA_MAP R8=I)I-8  
} ?ae[dif  
 4]DAh  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) z\Pe{J  
//{{AFX_MSG_MAP(CCaptureDlg) {8!ZKlB  
 ON_WM_SYSCOMMAND() {?@t/.4[W3  
 ON_WM_PAINT() ;o-\.=l  
 ON_WM_QUERYDRAGICON() TbKP8zw{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) "}'8`k+d  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) g+>=C   
 ON_BN_CLICKED(ID_CHANGE, OnChange) ;gxN@%}@  
//}}AFX_MSG_MAP H})Dcg3  
END_MESSAGE_MAP() i14[3bPLk!  
VjA wn}eO  
BOOL CCaptureDlg::OnInitDialog() ( Lok  
{ \A'|XdQ  
 CDialog::OnInitDialog(); /-!&k  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); H )BOSZD  
 ASSERT(IDM_ABOUTBOX < 0xF000); ?q d,>  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 9*}iBs  
 if (pSysMenu != NULL) &\J?[>EJ.  
 { V-D}U$fw  
  CString strAboutMenu; {h/OnBwG  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %XEKhy  
  if (!strAboutMenu.IsEmpty()) 0`VD!_`  
  { !G)mjvEe  
   pSysMenu->AppendMenu(MF_SEPARATOR); /~o7Q$)-b  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `y8 ?=  
  } ~")h E%Kl}  
 } :X'*8,]KHH  
 SetIcon(m_hIcon, TRUE); // Set big icon z +3<$Z  
 SetIcon(m_hIcon, FALSE); // Set small icon lv<iJH\  
 m_Key.SetCurSel(0); kq)+@p  
 RegisterHotkey(); 1s{ISWm  
 CMenu* pMenu=GetSystemMenu(FALSE); u @{E{  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); pY+.SuM  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7ei>L]gm%  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); U}tl_5%)  
 return TRUE; // return TRUE unless you set the focus to a control x4CtSGG85f  
} BA~a?"HS  
T"L0Iy!k;  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Ys"|</;dbj  
{ .dD9&n;#^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) B<|:K\MA  
 { .ocx(_3G  
  CAboutDlg dlgAbout; Zu\p;!e  
  dlgAbout.DoModal(); 2Pbe~[  
 } Q)x?B]b-  
 else w{k1Y+1  
 { RL?u n}Qa  
  CDialog::OnSysCommand(nID, lParam); u] F7 0C^~  
 } Ni+3b  
} I#"t'=9H  
zq,iLoY[R  
void CCaptureDlg::OnPaint() iP<k1#k  
{ BQyvj\uJ  
 if (IsIconic()) |HrM_h<X  
 { ;EgzC^2e  
  CPaintDC dc(this); // device context for painting 6OfdD.y  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); t9G}Yd[T  
  // Center icon in client rectangle kP7a:(P_g  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7cIC&(h5  
  int cyIcon = GetSystemMetrics(SM_CYICON); -'I _*fu  
  CRect rect; k4S} #!  
  GetClientRect(&rect); l% rx#;=u  
  int x = (rect.Width() - cxIcon + 1) / 2; cqeR<len  
  int y = (rect.Height() - cyIcon + 1) / 2; /SnynZ.q  
  // Draw the icon :|Z$3q  
  dc.DrawIcon(x, y, m_hIcon); R;H?gE^m-  
 } 1a<]$tZk  
 else J__;.rnk  
 { ykxbX  
  CDialog::OnPaint(); ,VPbUo@  
 } +p13xc?#j  
} - G8c5b[  
VBu8}}Ql  
HCURSOR CCaptureDlg::OnQueryDragIcon() ./#e1m?.  
{ 'dkXYtKCB  
 return (HCURSOR) m_hIcon; #2h+dk$1  
} y)6,0K {k  
NA+&jV  
void CCaptureDlg::OnCancel() XR|"dbZW.0  
{ 3rxo,pX94  
 if(bTray) u FMIY(vB  
  DeleteIcon(); DC&A1I&  
  CDialog::OnCancel(); /@Ez" ?V2  
} >Z *iE"9"  
b& V`<'{  
void CCaptureDlg::OnAbout() 3DH.4@7P  
{ pss6Oz8  
 CAboutDlg dlg; _)Qy4[S=d  
 dlg.DoModal(); ([Ebsj  
} ?8Et[tFg  
wuKl-:S;Vs  
void CCaptureDlg::OnBrowse() ;P3>>DZ  
{ 1xz\=HOT  
 CString str; [_h%F,_ A  
 BROWSEINFO bi; gF3TwAr  
 char name[MAX_PATH]; lY.B  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); "ml?7Xl,n  
 bi.hwndOwner=GetSafeHwnd(); Yj) e$f  
 bi.pszDisplayName=name; Xq|nJ|h  
 bi.lpszTitle="Select folder"; p"KU7-BfvC  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; O:1DOUYXs  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); -PM)EGSk{  
 if(idl==NULL) h}avX*Lx_  
  return; #Rc5c+/(  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); opdu=i=E  
 str.ReleaseBuffer(); !6Q`>s]  
 m_Path=str; \E Z+#3u  
 if(str.GetAt(str.GetLength()-1)!='\\') BjiYv}J  
  m_Path+="\\"; ~wTX >qV  
 UpdateData(FALSE); X:Q$gO?[4  
} gA_krK ,Z  
kBbl+1{H  
void CCaptureDlg::SaveBmp() Uh.Sc:trA  
{ *wwhZe4V  
 CDC dc; yLW/ -%I#u  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 27>a#vCT  
 CBitmap bm; va5FxF*%  
 int Width=GetSystemMetrics(SM_CXSCREEN); =N_,l'U\^  
 int Height=GetSystemMetrics(SM_CYSCREEN); 9RxO7K  
 bm.CreateCompatibleBitmap(&dc,Width,Height); *xcP`  
 CDC tdc; ;W0]66&  
 tdc.CreateCompatibleDC(&dc); \OcMiuw  
 CBitmap*pOld=tdc.SelectObject(&bm); H>?F8R_iq  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _S"f_W  
 tdc.SelectObject(pOld); Y;,Hzmbs6w  
 BITMAP btm; l)Zs-V!M^\  
 bm.GetBitmap(&btm); %fv)7 CRM  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /&h+t^l_Qj  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "x&3Z@q7  
 BITMAPINFOHEADER bih; .B>B`q;B  
 bih.biBitCount=btm.bmBitsPixel; %,|ztH/ Q  
 bih.biClrImportant=0; L~dC(J)@ZI  
 bih.biClrUsed=0; YdI0E   
 bih.biCompression=0; IZ8y}2  
 bih.biHeight=btm.bmHeight; OC_M4{9/  
 bih.biPlanes=1; t}Ss=0dJO  
 bih.biSize=sizeof(BITMAPINFOHEADER); :mpiAs<%U"  
 bih.biSizeImage=size; =OYQM<q  
 bih.biWidth=btm.bmWidth; A W)a">|  
 bih.biXPelsPerMeter=0; t[EfOQ  
 bih.biYPelsPerMeter=0; &!jq!u$(  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); # .<V^  
 static int filecount=0; 6^;^rUlm  
 CString name; Pd~MiyO;K  
 name.Format("pict%04d.bmp",filecount++); 2J<&rKCF  
 name=m_Path+name; &x0C4Kh  
 BITMAPFILEHEADER bfh; f7J,&<<5w  
 bfh.bfReserved1=bfh.bfReserved2=0; iITp**l  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $}R$t-  
 bfh.bfSize=54+size; YsP/p-  
 bfh.bfOffBits=54; !8*McO I  
 CFile bf; B wC+ov=  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ tWY2o3j  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); pUCK-rL  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ( KTnJZ  
  bf.WriteHuge(lpData,size); 5h8o4  
  bf.Close(); -(>qu.[8=  
  nCount++; |y"jZT6R}t  
 } ?z/Vgk+9|  
 GlobalFreePtr(lpData); ,=o0BD2q  
 if(nCount==1) e7xj_QH  
  m_Number.Format("%d picture captured.",nCount); ? } (=  
 else =x0No*#|'  
  m_Number.Format("%d pictures captured.",nCount); aq Mc6N`z  
  UpdateData(FALSE); t)N;'v  &  
} j$x)pB3]  
@T&t.|`  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -[R!O'N9  
{ F Z!J  
 if(pMsg -> message == WM_KEYDOWN) Y-p<qL|_  
 { \k@Z7+&7  
  if(pMsg -> wParam == VK_ESCAPE) dB;3.<S=  
   return TRUE; H9` f0(H  
  if(pMsg -> wParam == VK_RETURN) xd8 *<,Wj  
   return TRUE; )"`!AerJ  
 } * OsU Y=;  
 return CDialog::PreTranslateMessage(pMsg); <\@ 1Zz@ms  
} }B q^3?,#{  
47UO*oLS  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f: xWu-  
{ dvjTyX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *8)2iv4[  
  SaveBmp(); W f@t4(i  
  return FALSE; ALGg AX3t  
} d~*TIN8Ke~  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {8@\Ij  
 CMenu pop; N[Sb#w`[/  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); _3>djF_u  
 CMenu*pMenu=pop.GetSubMenu(0); Q_zr\RM>  
 pMenu->SetDefaultItem(ID_EXITICON); 4 tXSYHd3  
 CPoint pt; 1;&;5  
 GetCursorPos(&pt); =Q(vni83<  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); DjHp+TyT  
 if(id==ID_EXITICON) mm[SBiFO\  
  DeleteIcon(); _+w/ pS`M  
 else if(id==ID_EXIT) B@t'U=@7  
  OnCancel(); "tu*YNP\Q  
 return FALSE; 5Qa zHlJ  
} :0 ^s0l  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Q$ZHv_VLx  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) V 0{tap}  
 AddIcon(); w([$@1]  
 return res; sR=/%pVN  
} NY.k.  
<]G${y*;  
void CCaptureDlg::AddIcon() t FgX\4  
{ n56;m`IU  
 NOTIFYICONDATA data; I*\^,ow  
 data.cbSize=sizeof(NOTIFYICONDATA); ml u 3K  
 CString tip; D59T?B|BdD  
 tip.LoadString(IDS_ICONTIP); PRs@zkO  
 data.hIcon=GetIcon(0); 2 x 4=  
 data.hWnd=GetSafeHwnd(); lKV"Mh+6  
 strcpy(data.szTip,tip); onte&Ed\  
 data.uCallbackMessage=IDM_SHELL; )`HA::  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Vhg1/EgUr  
 data.uID=98; mBk5+KyT  
 Shell_NotifyIcon(NIM_ADD,&data); ijUzC>O+q  
 ShowWindow(SW_HIDE); :&VcB$  
 bTray=TRUE; xxa} YIe8  
} O}Le]2'  
w'ybbv{c  
void CCaptureDlg::DeleteIcon() =AOWeLk*G  
{ Xl%0/ o  
 NOTIFYICONDATA data; 9 E1W|KE  
 data.cbSize=sizeof(NOTIFYICONDATA); IA*KaX2S<  
 data.hWnd=GetSafeHwnd(); x?r1s#88>  
 data.uID=98; K7`YJp`i  
 Shell_NotifyIcon(NIM_DELETE,&data); P $ >`  
 ShowWindow(SW_SHOW); ?tYpc_p#  
 SetForegroundWindow(); 7#-y-B]l  
 ShowWindow(SW_SHOWNORMAL); :w-`PY J%G  
 bTray=FALSE; Jb(Y,LO^  
} sR_xe}-  
WDx Mo`zT  
void CCaptureDlg::OnChange() ?Zcj}e.r  
{ \pY^^ l*  
 RegisterHotkey(); -50AX1h31:  
} ;Zut@z4\  
`M@Ak2gcR+  
BOOL CCaptureDlg::RegisterHotkey() Y2T$BJJ  
{ kA#vByf`v  
 UpdateData(); 6*XM7'n  
 UCHAR mask=0; svhrf;3:  
 UCHAR key=0; hW 2.8f$  
 if(m_bControl) &M"ouy Zo9  
  mask|=4; wH6u5*$p  
 if(m_bAlt) ]=&L_(34  
  mask|=2; F 3RB  
 if(m_bShift) s& yk  
  mask|=1; =mt?C n}  
  key=Key_Table[m_Key.GetCurSel()]; CjL<RJR=  
 if(bRegistered){ E{Vo'!LY  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); n9hm790x-  
  bRegistered=FALSE; KCR N}`^  
 } <$E6oZ  
 cMask=mask; <94G  
 cKey=key; *\XH+/]+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); RtV.d \  
 return bRegistered; FY#!N L  
} =@r--E  
pSAR/':eg  
  四、小结 t#~?{i@m  
F@vbSFv)/  
  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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