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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: }M="oN~w  
  R{ 4u|A?9  
  一、实现方法 _Ua PwJ  
iI}nW  
  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: _&=9Ke  
) _ #T c  
#pragma data_seg("shareddata") H<{*ub4'L*  
HHOOK hHook =NULL; //钩子句柄 MKe *f%  
UINT nHookCount =0; //挂接的程序数目 "|\94  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 qWkx:-g]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 CCy .  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey lvG3<ls0K$  
static int KeyCount =0; DSTx#*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6XZN>#  
#pragma data_seg() 0x6@{0  
 @}Pw0vC  
  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。 }0krSzcn#,  
|})rt5|f1!  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: U <|B7t4M  
br10ptEx  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hN!.@L  
cKey,UCHAR cMask) lej^gxj/2  
{ `c>A >c|  
 BOOL bAdded=FALSE; DU(X,hDBF  
 for(int index=0;index<MAX_KEY;index++){ NCp%sGBmG  
  if(hCallWnd[index]==0){ 2Sv>C `FMU  
   hCallWnd[index]=hWnd; 1ME|G"$;  
   HotKey[index]=cKey; ^75pV%<%  
   HotKeyMask[index]=cMask; E:%>0FE  
   bAdded=TRUE; Z#%}K Z  
   KeyCount++; Cnk#Ioz  
   break; _%XbxP6rH  
  } zCyR<as7  
 } #dL5x{gV=  
 return bAdded; K T%i,T  
} P: jDB{  
//删除热键 hLCsQYNDU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9{T 8M  
{ |yuGK  
 BOOL bRemoved=FALSE; 6_x}.bkIx=  
 for(int index=0;index<MAX_KEY;index++){ -i2D#i'  
  if(hCallWnd[index]==hWnd){ se }pdL}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ T,A!5V>cX  
    hCallWnd[index]=NULL; <d3PDO@w/  
    HotKey[index]=0; "Wxo[I  
    HotKeyMask[index]=0; ?]759,Q3L  
    bRemoved=TRUE; JvT %R`i  
    KeyCount--; 8|fLe\"  
    break; +!D=SnBGs  
   } +?ws !LgF  
  } \z&03@Sw  
 } {(8U8f<'=y  
 return bRemoved; A&x ab  
} 't||F1X~J  
AEiWL.*.  
v#{G8'+%  
  DLL中的钩子函数如下: &h98.A*&  
6tDg3`w>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5)h+(u C3  
{ -Y5YCY!`  
 BOOL bProcessed=FALSE; g| _HcaW  
 if(HC_ACTION==nCode) nNkyOaK*4  
 { i7Y s_8A"9  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 WK/b=p|#o  
   switch(wParam) [1t\|v  
   {  J r=REa0  
    case VK_MENU: @2-Hj~  
     MaskBits&=~ALTBIT; V,99N'o~x  
     break; "H wVK  
    case VK_CONTROL: ,<R>Hiwg/s  
     MaskBits&=~CTRLBIT; R (+h)#![  
     break; Nv}U/$$S  
    case VK_SHIFT: Uqb]e?@  
     MaskBits&=~SHIFTBIT; P]~N-xdV  
     break; Z1XUYe62  
    default: //judge the key and send message (CKhY~,/u  
     break; * ePDc'   
   } G~b`O20N  
   for(int index=0;index<MAX_KEY;index++){ :mCw.Jz<h  
    if(hCallWnd[index]==NULL) 5?#OR!N  
     continue; FU [8:o62  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }z9I`6[  
    { vWPM:1A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); __oY:d(~  
     bProcessed=TRUE; LS R_x$G+t  
    } %OezaNOtm  
   } N2+mN0k;  
  } Gd]5xl HRU  
  else if((lParam&0xc000ffff)==1){ //有键按下 U]`'GM/x  
   switch(wParam) =rf )yp-D  
   { yBXkN&1=%;  
    case VK_MENU: F``EARG)iu  
     MaskBits|=ALTBIT; [RGC!}"mr  
     break; E< io^  
    case VK_CONTROL: 0{^l2?mgSb  
     MaskBits|=CTRLBIT; <=5,(a5g  
     break; \UkNE5  
    case VK_SHIFT: e{q p!N1!  
     MaskBits|=SHIFTBIT; y{&{=1#  
     break; k8Su/U  
    default: //judge the key and send message t wa(M?  
     break; ue^?/{OuT  
   } F1{?]>G  
   for(int index=0;index<MAX_KEY;index++){ &UJ Ty'  
    if(hCallWnd[index]==NULL) 14@q$}sf  
     continue; )eTnR:=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q+y-*1   
    { l\A}lC0?J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 'AAF/9  
     bProcessed=TRUE; )Ta]6  
    } }QApeZd+q  
   } (F4dFh  
  } 'aSZ!R  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &\WkJ}&PnA  
   for(int index=0;index<MAX_KEY;index++){ M; S-ESQ  
    if(hCallWnd[index]==NULL) :3E8`q~c1  
     continue; 0IT20.~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) dZ;~b(CA  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); b6?Xo/lJ.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 {3F}Slb  
   } n41\y:CAo  
  } K\Y6 cj  
 } ^)%wq@Hi  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !)51v {  
} <Vr] 2mw  
Hjo:;s  
  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: =5s~$C  
6U,U[MWJ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f4aD0.K.g|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x9{Sl[2&  
^c[CyZ:a  
  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: (`uC"MLk  
T^=Ee?e  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u1pYlu9IW  
{ 4%c7#AX[T  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) u[6`Jr~  
 { ?G%, k LJJ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 x/jN& ;"/  
  SaveBmp(); @]VvqCk  
  return FALSE; +~pc% 3*  
 } D.oS8'   
 …… //其它处理及默认处理 /="D]K)%b8  
} g^<q L|  
2}xFv2X  
[y&h_w.  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 V"Y Fu^L  
gp|7{}Q{  
  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。 'mY,>#sT  
C}DG'z9  
  二、编程步骤 oRJP5Y5na  
LTls]@N  
  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"; 48"Y-TV  
zf!\wY"`  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; iYfLo">  
Lh9>8@ jf  
  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; scPq\Qd?O  
7+Jma!o  
  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; PB3!;  
77=y!SDP  
  5、 添加代码,编译运行程序。 $xn%i\  
s%TO(vT  
三、程序代码 +/_B/[e<>  
/o06hy  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL g9r5t';  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {]_{BcK+  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ yfw>y=/p  
#if _MSC_VER > 1000 f!R^;'a  
#pragma once &fNE9peQFa  
#endif // _MSC_VER > 1000 BQfAen]  
#ifndef __AFXWIN_H__ F+m4  
#error include 'stdafx.h' before including this file for PCH uL2 {v  
#endif XGup,7e9  
#include "resource.h" // main symbols 3b[[2x_UU  
class CHookApp : public CWinApp $E@.G1T [  
{ s? \9i6  
 public: ^[?+=1 k  
  CHookApp(); $X\` 7`v  
  // Overrides )b2E/G@X&  
  // ClassWizard generated virtual function overrides *p5T  
  //{{AFX_VIRTUAL(CHookApp) 2Q_{2(nQb  
 public: sT"tS>  
  virtual BOOL InitInstance(); u.K'"-xt4K  
  virtual int ExitInstance(); >p#d;wK4_  
  //}}AFX_VIRTUAL  IOES3  
  //{{AFX_MSG(CHookApp) `q{'_\gVt(  
  // NOTE - the ClassWizard will add and remove member functions here. 6%hEs6-R  
  // DO NOT EDIT what you see in these blocks of generated code ! I8oKa$RF  
  //}}AFX_MSG rpP+20v  
  DECLARE_MESSAGE_MAP() mM^8YL  
}; s1b\I6&:J  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); xp;8p94   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :x5o3xE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c68$pgG  
BOOL InitHotkey(); DBrzw+;e3  
BOOL UnInit(); snzH}$Ls  
#endif v&/-&(+  
%|6Q7'@p  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. uXW. (x7"f  
#include "stdafx.h" }6{)Jv  
#include "hook.h" )^2jsy -/  
#include <windowsx.h> f%%En5e +  
#ifdef _DEBUG SE-, 1p  
#define new DEBUG_NEW NTX+7<  
#undef THIS_FILE yW,#&>]# |  
static char THIS_FILE[] = __FILE__; K dQ|$t  
#endif (V%vFD1)  
#define MAX_KEY 100 GN"LU>9|  
#define CTRLBIT 0x04 7}7C0mV3  
#define ALTBIT 0x02 <+JFal  
#define SHIFTBIT 0x01 0+`*8G)  
#pragma data_seg("shareddata") Evgq}3  
HHOOK hHook =NULL; 7(iRz  
UINT nHookCount =0; szs3x-g  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey }@0.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT N0KRND  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 8}b[Q/h!  
static int KeyCount =0; @{GxQzo  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift H4",r5qw:  
#pragma data_seg() iK0J{'  
HINSTANCE hins; y(BLin!O.  
void VerifyWindow(); u\Q**m2XP  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ~l(tl[  
//{{AFX_MSG_MAP(CHookApp) @uD{`@[  
// NOTE - the ClassWizard will add and remove mapping macros here. (j Q6~1  
// DO NOT EDIT what you see in these blocks of generated code! ' "p*FN  
//}}AFX_MSG_MAP d33Nx)No  
END_MESSAGE_MAP() Q"_T040B  
Y-k~ 7{7  
CHookApp::CHookApp() f;dU72]q+  
{ gx R|S  
 // TODO: add construction code here, d(tf: @  
 // Place all significant initialization in InitInstance WC;a  
} zC;lfy{f=  
m8A1^ R  
CHookApp theApp; xJ5!` #=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j@\/]oL^We  
{ dp W%LXM_  
 BOOL bProcessed=FALSE; vy y\^nL  
 if(HC_ACTION==nCode) 6u3(G j@  
 { X.5LB!I)  
  if((lParam&0xc0000000)==0xc0000000){// Key up -zkL)<7  
   switch(wParam) qnV9TeU)  
   { nECf2>Yp v  
    case VK_MENU: Pt;Ahmi  
     MaskBits&=~ALTBIT; !sWBj'[>  
     break; PX/0  jv  
    case VK_CONTROL: 6MQ:C'8T&=  
     MaskBits&=~CTRLBIT; nit7|T@^  
     break; I"?&X4%e  
    case VK_SHIFT: nOzT Hg8  
     MaskBits&=~SHIFTBIT; z3LPR:&Z  
     break; }f*S 9V  
    default: //judge the key and send message RL8 wSK  
     break; cYS+XBz  
   } o:*iT =l  
   for(int index=0;index<MAX_KEY;index++){ zwK;6&(W  
    if(hCallWnd[index]==NULL) ,6pH *b $  
     continue; 8 z7,W3b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Lwk-  
    { ?"u-@E[m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); z9w.=[Io  
     bProcessed=TRUE; z5w|+9U  
    } ]iX$p~riH  
   } k]YGD  
  } S3wH M  
  else if((lParam&0xc000ffff)==1){ //Key down uS,$P34^oy  
   switch(wParam) yBKlp08J  
   { sR nMBW.  
    case VK_MENU: W<l(C!{  
     MaskBits|=ALTBIT; {m GWMv  
     break; l))IO`s=_  
    case VK_CONTROL: [)u{-  
     MaskBits|=CTRLBIT; h]9^bX__Z  
     break; pdqh'+5  
    case VK_SHIFT: H4jqF~  
     MaskBits|=SHIFTBIT; A[a+,TN {  
     break; Xpwom'  
    default: //judge the key and send message LXl! !i%  
     break; Ba~Iy2\x  
   } "KwKO8f  
   for(int index=0;index<MAX_KEY;index++) P2F>iK#U  
   { #1R %7*$i  
    if(hCallWnd[index]==NULL) >^N :A  
     continue; `h6W@ROb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =Y[Ae7e  
    { s ~G{-)*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3J<,2  
     bProcessed=TRUE; h65j,v6B  
    } miqCUbcU  
   } q5PYc.E([  
  } k*^W lCZ3  
  if(!bProcessed){ #C mBgxg+M  
   for(int index=0;index<MAX_KEY;index++){ "dTXT  
    if(hCallWnd[index]==NULL) YZ@-0_Z  
     continue; dW68lVWq_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) YvX I  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |e >-v  
   } ak [)+_k_  
  } EVsZ:Ra^k  
 } Nig-D>OS  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); AF6'JxG7  
} #J_i 5KmXJ  
Y2EN!{YU  
BOOL InitHotkey() ibyA~YUN/  
{ ,vPF=wq  
 if(hHook!=NULL){ 3FN? CN] O  
  nHookCount++; VWa(@ A  
  return TRUE; !4:,,!T  
 } f'dI"o&^/d  
 else 6Y^o8R  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 5>Q)8` @E  
  if(hHook!=NULL) X$f%Ss  
   nHookCount++; iXFaQ  
  return (hHook!=NULL); E12k1gC`  
} T^_9R;  
BOOL UnInit() ZI7<E  
{ HJmO+  
 if(nHookCount>1){ hLRQ)  
  nHookCount--; xJCpWU3wM  
  return TRUE; /&yT2p  
 } t=AR>M!w~  
 BOOL unhooked = UnhookWindowsHookEx(hHook); tUQ)q  
 if(unhooked==TRUE){ ZtVa*xl  
  nHookCount=0; yhaYlYv[_3  
  hHook=NULL; kns]P<g  
 } tS$Ne7yk e  
 return unhooked; +zsya4r  
} e+wd>iiB  
F*f)Dv$p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) . +>}},  
{ _q 8m$4  
 BOOL bAdded=FALSE; n>WS@b/o  
 for(int index=0;index<MAX_KEY;index++){ ~ 4a aJ0  
  if(hCallWnd[index]==0){ YbKW;L&Ff  
   hCallWnd[index]=hWnd; .FUE F)  
   HotKey[index]=cKey; 4"sP= C  
   HotKeyMask[index]=cMask; &,zeBFmc  
   bAdded=TRUE; :9}*p@  
   KeyCount++; 9\F^\h{  
   break; U,'n}]=4A3  
  } Y~Rwsx  
 } w8qI7/  
 return bAdded; s6B@:9  
} `f'P  
K_i2%t3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5 S 1m&s5k  
{ s>5 Z  
 BOOL bRemoved=FALSE; *q RQN+%  
 for(int index=0;index<MAX_KEY;index++){ {Fj`'0Xu;  
  if(hCallWnd[index]==hWnd){ k{~5pxd-t  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Gkl#s7'  
    hCallWnd[index]=NULL; PsLCO(26  
    HotKey[index]=0; "q$M\jK#V  
    HotKeyMask[index]=0; >qE$:V "_5  
    bRemoved=TRUE; L" o6)N  
    KeyCount--; {#vo^& B  
    break; Ev%\YI!MaY  
   } /y}  
  } tVOx  
 } P1t5-q  
 return bRemoved; r$KDNa$/a  
} /SiQw7yp%  
yC[}gHv  
void VerifyWindow() gnQd#`  
{ 9g7T~|P  
 for(int i=0;i<MAX_KEY;i++){ gisZmu0  
  if(hCallWnd!=NULL){ n#*cVB81  
   if(!IsWindow(hCallWnd)){ ?g'l/xuRe  
    hCallWnd=NULL; yZ`\.GgC^&  
    HotKey=0; 6[cMPp x  
    HotKeyMask=0; GB#7w82  
    KeyCount--; -a3C3!!  
   } 0^+W"O  
  } Jps!,Mflc  
 } FQ5# v{  
} \?j(U8mB>  
344- ~i*  
BOOL CHookApp::InitInstance() m*1=-" P  
{ VD4(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]?^mb n  
 hins=AfxGetInstanceHandle(); ^#nAS2w7U  
 InitHotkey(); 0:XmReO+k  
 return CWinApp::InitInstance(); ||hd(_W8  
} #r\uh\Cy  
8W{R&Z7aL  
int CHookApp::ExitInstance() E:2Or~  
{ rB4]TQ`c  
 VerifyWindow(); J&Ah52  
 UnInit(); x`4">:IA  
 return CWinApp::ExitInstance(); ' `S,d[~  
} j:0z/gHp$  
|q?A8@\u  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {J[0UZ6  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *p"%cas  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 37VSE@Z+  
#if _MSC_VER > 1000 Z',pQ{rD  
#pragma once K#>B'>A\  
#endif // _MSC_VER > 1000 d2pVO]l YZ  
8"+Kz  
class CCaptureDlg : public CDialog MZ0 J/@(  
{ \Q]7Hw<  
 // Construction Lx.X#n.]T  
 public: 8IO4>CMkv  
  BOOL bTray; _s^sZ{'2_  
  BOOL bRegistered; O[!]/qP+.  
  BOOL RegisterHotkey(); `U(FdT  
  UCHAR cKey; 7v{Dwg  
  UCHAR cMask; qTG/7tn "  
  void DeleteIcon(); LVX.stN#p  
  void AddIcon(); =m UtBD.;  
  UINT nCount; z&w@67 >j  
  void SaveBmp(); gF&1e5`i  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 'Je;3"@  
  // Dialog Data f|u!?NGl  
  //{{AFX_DATA(CCaptureDlg) :AL nm0d  
  enum { IDD = IDD_CAPTURE_DIALOG }; {$Qw]?Yv  
  CComboBox m_Key; v81<K*w`P  
  BOOL m_bControl; NOQM:tBO>  
  BOOL m_bAlt; Zv-#v  
  BOOL m_bShift; 3>ytpXUEGx  
  CString m_Path; }5`Kn}rY  
  CString m_Number; *~cq (PFQ  
  //}}AFX_DATA F.4xi+S_  
  // ClassWizard generated virtual function overrides ^)TZHc2a[  
  //{{AFX_VIRTUAL(CCaptureDlg) NbH;@R)L  
 public: k*J0K=U|  
  virtual BOOL PreTranslateMessage(MSG* pMsg); T< D&%)  
 protected: EW]rD  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (V&$KDOA  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "_W[X  
  //}}AFX_VIRTUAL  tmKHT  
  // Implementation %AaZc=a[c  
 protected: b-,4< H8m  
  HICON m_hIcon; K9]L>Wj  
  // Generated message map functions UZz/v#y~  
  //{{AFX_MSG(CCaptureDlg) vr"O9L w  
  virtual BOOL OnInitDialog(); N:_.z~>%  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !Wgi[VB  
  afx_msg void OnPaint(); *jM]:GpyoU  
  afx_msg HCURSOR OnQueryDragIcon(); <v%Q|r  
  virtual void OnCancel(); @cukoLAn  
  afx_msg void OnAbout(); "\3C)Nz?  
  afx_msg void OnBrowse(); `p#tx.o  
  afx_msg void OnChange(); ;0FfP  
 //}}AFX_MSG mb,\wZ  
 DECLARE_MESSAGE_MAP() LtW}R4}3  
}; yvv]iRk<  
#endif BlnR{Y  
sFt"2TVr3  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  4 Fl>XM  
#include "stdafx.h" >P@g].Q-  
#include "Capture.h" lha)4d  
#include "CaptureDlg.h" \xG_q>1_  
#include <windowsx.h> a`I \19p]  
#pragma comment(lib,"hook.lib") e>0gE`8A  
#ifdef _DEBUG ||D PIn]  
#define new DEBUG_NEW z9Z4MXl  
#undef THIS_FILE 41g "7Mk  
static char THIS_FILE[] = __FILE__; *+(rQ";x  
#endif z.lIlp2:  
#define IDM_SHELL WM_USER+1 ,Wv+Ek  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }k;wSp[3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C cPOK2  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; galzk$D  
class CAboutDlg : public CDialog ,R. rxoO  
{ 6%it`A8}  
 public: rtNYX=P  
  CAboutDlg(); .exBU1Yk@  
  // Dialog Data &+ "<ia(  
  //{{AFX_DATA(CAboutDlg) L I*=T   
  enum { IDD = IDD_ABOUTBOX }; fqjBor}  
  //}}AFX_DATA (@->AJF1\  
  // ClassWizard generated virtual function overrides E5!vw@,  
  //{{AFX_VIRTUAL(CAboutDlg) 60;_^v  
 protected: 7r&lW<:>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support djH&)&q!  
  //}}AFX_VIRTUAL NOg/rDs'{  
  // Implementation 4C/G &w&  
 protected: E;}&2 a  
  //{{AFX_MSG(CAboutDlg) )(0if0D4  
  //}}AFX_MSG 9#TD1B/  
  DECLARE_MESSAGE_MAP() A'BqNsy  
}; yDfH`]i)U  
h4jo<yp\  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |.VSw  
{ FQJiLb._Z  
 //{{AFX_DATA_INIT(CAboutDlg) Fei5'  
 //}}AFX_DATA_INIT "4\k1H"_  
} EB| iW2'  
r4pX4 7H  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) tL3R<'  
{ oUwo!n}  
 CDialog::DoDataExchange(pDX); 3m= _a  
 //{{AFX_DATA_MAP(CAboutDlg) +j{(NwsX  
 //}}AFX_DATA_MAP ?r KbL^2  
} -w*fS,O  
D6A u)1y=&  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) [I=|"Ic~  
 //{{AFX_MSG_MAP(CAboutDlg) G<M0KU (  
 // No message handlers .<zKBv  
 //}}AFX_MSG_MAP FY^2 Y  
END_MESSAGE_MAP() V:w%5'^3  
 V1B!5N<  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) w]t'2p-'  
: CDialog(CCaptureDlg::IDD, pParent) WW+xU0  
{ g'KxjjYT,  
 //{{AFX_DATA_INIT(CCaptureDlg) 9j|v D  
  m_bControl = FALSE; a M9v  
  m_bAlt = FALSE; Asv]2> x  
  m_bShift = FALSE; kV+^1@"  
  m_Path = _T("c:\\"); }%p:Xv@X!  
  m_Number = _T("0 picture captured."); Qn7T{ BW  
  nCount=0; 0CX,"d_T,  
  bRegistered=FALSE; N]w_9p~=1  
  bTray=FALSE; h*%FZ}}`q  
 //}}AFX_DATA_INIT 3("C'(W  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Vx(*OQ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); uG^CyM>R`  
} gYhY1Mym  
GuO}CQs^W  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #h?I oB7  
{ `*Yw-HL  
 CDialog::DoDataExchange(pDX); H0;Iv#S!  
 //{{AFX_DATA_MAP(CCaptureDlg) EW|$qLg  
  DDX_Control(pDX, IDC_KEY, m_Key); qS#G7~ur>y  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3Rc*vVnI  
  DDX_Check(pDX, IDC_ALT, m_bAlt); N$6e KJ]  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Up{[baWF  
  DDX_Text(pDX, IDC_PATH, m_Path); *{3d+j/?/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ux<|8S  
 //}}AFX_DATA_MAP 4p,:}h  
} j:h}ka/!p  
se\fbe^0  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) C3}:DIn"w  
//{{AFX_MSG_MAP(CCaptureDlg) 8cG?p  
 ON_WM_SYSCOMMAND() -N8rs[c  
 ON_WM_PAINT() rW)h ? , b  
 ON_WM_QUERYDRAGICON() ,B[j{sE  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) /~Y\KOH|  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) WeM38&dWY  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7v*gwBH  
//}}AFX_MSG_MAP ysz =Xw  
END_MESSAGE_MAP() SXk.7bMV6  
uZC=]Ieh  
BOOL CCaptureDlg::OnInitDialog() 5tYo! f  
{ ,WRm{ v0f^  
 CDialog::OnInitDialog(); E`.xu>Yyj  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); d5$D[,`1  
 ASSERT(IDM_ABOUTBOX < 0xF000); c_3B:F7  
 CMenu* pSysMenu = GetSystemMenu(FALSE); I8Aq8XBw  
 if (pSysMenu != NULL) 4rU/2}. q  
 { GGp.u@\r  
  CString strAboutMenu; fzIs^(:fl  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 0~bUW V  
  if (!strAboutMenu.IsEmpty()) ISGw}#}]?  
  { xqt?z n  
   pSysMenu->AppendMenu(MF_SEPARATOR); <E2 IU~e  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \rS*\g:i  
  } 6kYluV+j  
 } ,U~A=bsa  
 SetIcon(m_hIcon, TRUE); // Set big icon ib=)N)l  
 SetIcon(m_hIcon, FALSE); // Set small icon % T({;/  
 m_Key.SetCurSel(0); nGH6D2!F  
 RegisterHotkey(); =SJ#6uFS  
 CMenu* pMenu=GetSystemMenu(FALSE); jE*{^+n  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); AS7L  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); B*T n@t W  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Q;]JVT1  
 return TRUE; // return TRUE unless you set the focus to a control 3`bQ0-D;  
} X' `n>1z  
 0k (-  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) rYb5#aT[  
{ wZ(1\ M(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lq-KM8j  
 { }u_D{bz  
  CAboutDlg dlgAbout; A NhqS  
  dlgAbout.DoModal(); 8A#,*@V[  
 } k+J%o%* <  
 else `D4Wg<,9  
 { W_W!v&@E=  
  CDialog::OnSysCommand(nID, lParam); Tqt-zX|>  
 } danPy2  
} K!6T8^JH  
h.edb6  
void CCaptureDlg::OnPaint() @IL04' \  
{ "wgPPop  
 if (IsIconic()) OG5{oH#K  
 { J :O!4gI  
  CPaintDC dc(this); // device context for painting l77 -I:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); bf_ > ?F^  
  // Center icon in client rectangle LCivZ0?|X  
  int cxIcon = GetSystemMetrics(SM_CXICON); # EvRm  
  int cyIcon = GetSystemMetrics(SM_CYICON); vNSUrf,r  
  CRect rect; ,X|Oe@/  
  GetClientRect(&rect); QTHY{:Rmu  
  int x = (rect.Width() - cxIcon + 1) / 2; 5i[O\@]5  
  int y = (rect.Height() - cyIcon + 1) / 2; LKM018H>  
  // Draw the icon |{#St-!-7  
  dc.DrawIcon(x, y, m_hIcon); ZFtx&vr P  
 } ~su>RolaX  
 else Gdow[x  
 { [+\He/M6  
  CDialog::OnPaint(); eKiDc=@  
 } _}F& ^  
} k8s)PN  
evyjHcCx  
HCURSOR CCaptureDlg::OnQueryDragIcon() &]TniQH  
{ A[l )>:  
 return (HCURSOR) m_hIcon; Cff6EE  
} jwI2T$  
{y"Kn'1  
void CCaptureDlg::OnCancel() 9K$ x2U  
{ 2 5~Z%_?  
 if(bTray) mnA_$W3~I  
  DeleteIcon(); v?He]e'  
  CDialog::OnCancel(); F$UL.`X _/  
} OLx;j+p  
1K/HVj+'.  
void CCaptureDlg::OnAbout() PhAfEsD  
{ ^&;,n.X5Z  
 CAboutDlg dlg; |>ztx}\  
 dlg.DoModal(); n.l#(`($4  
} ep8UWxB5  
]WMzWt:L  
void CCaptureDlg::OnBrowse() KH2]:&6:Q  
{ }XUL\6U  
 CString str; vAM1|,U  
 BROWSEINFO bi; 6.]~7n  
 char name[MAX_PATH]; X!|eRA~o  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); CzlG#?kU?2  
 bi.hwndOwner=GetSafeHwnd(); x_3B) &9  
 bi.pszDisplayName=name; 6$OmOCA%  
 bi.lpszTitle="Select folder"; NnAIL;WS  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; \:@6(e Bh  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); )xVf3l pQ  
 if(idl==NULL) _)j\ b  
  return; N_92,xI#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;gL{*gR]S  
 str.ReleaseBuffer(); `%\CO `  
 m_Path=str; Xm# +Z`|N  
 if(str.GetAt(str.GetLength()-1)!='\\') 6?x F!VIL  
  m_Path+="\\"; 1L`V{\_0s  
 UpdateData(FALSE); 5@RcAQb:  
} 3[Q7'\  
\dQc!)&C9  
void CCaptureDlg::SaveBmp() /[?} LrDO  
{ !n;3jAl&$  
 CDC dc; 0:Bpvl5  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); /S J><  
 CBitmap bm; B9,39rG/7+  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^Zvb3RJg  
 int Height=GetSystemMetrics(SM_CYSCREEN); p"P+8"`  
 bm.CreateCompatibleBitmap(&dc,Width,Height); [Q:mq=<Z%  
 CDC tdc; F=Xb_Gd`  
 tdc.CreateCompatibleDC(&dc); 0to`=;JI  
 CBitmap*pOld=tdc.SelectObject(&bm); -\p&18K#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); v#gXXO[P1  
 tdc.SelectObject(pOld); l[~$9C'ji  
 BITMAP btm; Zb_A(mnzh  
 bm.GetBitmap(&btm); gdCit-3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; i+(>w'=m  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); sf$hsPC^  
 BITMAPINFOHEADER bih; P84YriLo  
 bih.biBitCount=btm.bmBitsPixel; (Q*x"G#4>  
 bih.biClrImportant=0; r?u4[ Oe#  
 bih.biClrUsed=0; +8xT}mX  
 bih.biCompression=0; dG+$!*6Z  
 bih.biHeight=btm.bmHeight; N( 7(~D=)B  
 bih.biPlanes=1; 3XB`|\:  
 bih.biSize=sizeof(BITMAPINFOHEADER); )o:sDj`b]  
 bih.biSizeImage=size; =?W7OV^BE  
 bih.biWidth=btm.bmWidth; \A^8KVE!  
 bih.biXPelsPerMeter=0; LL);Ym9d  
 bih.biYPelsPerMeter=0; bp/l~h.7W  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [^GBg>k  
 static int filecount=0; v5@4 |u3ds  
 CString name; ea O'|@;{~  
 name.Format("pict%04d.bmp",filecount++); I~6(>Z{  
 name=m_Path+name; -J=6)  
 BITMAPFILEHEADER bfh; %h(%M'm?  
 bfh.bfReserved1=bfh.bfReserved2=0; N?t*4Y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); PZru:.Mh  
 bfh.bfSize=54+size; 3f$n8>mq  
 bfh.bfOffBits=54; KC&XOI %  
 CFile bf; dSKvs"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _R|_1xa=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); dn}EM7:Z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "c} en[  
  bf.WriteHuge(lpData,size); W{J e)N  
  bf.Close(); nCwA8AG  
  nCount++; E,\)tZ;,  
 } 74N_>1!j  
 GlobalFreePtr(lpData); +5I5  
 if(nCount==1) p2(ha3PW  
  m_Number.Format("%d picture captured.",nCount); gFuK/]gzI  
 else oQpGa>6U&  
  m_Number.Format("%d pictures captured.",nCount); L8n?F#q  
  UpdateData(FALSE); cQxUEY('+  
} 66-\}8f8a  
"*/IP9?]  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]#DCO8Vk  
{ qi~-<qW  
 if(pMsg -> message == WM_KEYDOWN) H!0m8LCnb  
 { %5+X  
  if(pMsg -> wParam == VK_ESCAPE) _t"[p_llo  
   return TRUE; P<Z` 8a[  
  if(pMsg -> wParam == VK_RETURN) 6:S, {@G  
   return TRUE; F,)+9/S&  
 } LN (\B:wAY  
 return CDialog::PreTranslateMessage(pMsg); ";`jS&"=  
} 1!V[fPJ  
ah<p_qe9|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9;I%Dv  
{ Q=%W-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ PA803R74  
  SaveBmp(); 7xB]Z;:  
  return FALSE; %'g)MK!e  
} ud(0}[  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~9APc{"A  
 CMenu pop; X0+E!~X$zM  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Y|b,pC|,  
 CMenu*pMenu=pop.GetSubMenu(0); _1Rw~}O  
 pMenu->SetDefaultItem(ID_EXITICON); ` ;mQ"lO  
 CPoint pt; u4T$  
 GetCursorPos(&pt); eD(5+bm  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); l]D $QT3  
 if(id==ID_EXITICON) W tw,YFT  
  DeleteIcon(); %{IgY{X  
 else if(id==ID_EXIT) irm4lb5  
  OnCancel(); OO?N)IB@  
 return FALSE; \z2y?"\?  
} .czUJyFms}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); nu+^D$ait  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ]=ApYg7!  
 AddIcon(); +1yi{!j1  
 return res; tA4Ra,-c  
} o:cTc:l)  
T<>B5G~%  
void CCaptureDlg::AddIcon() UkD\ma  
{ (x/:j*`K  
 NOTIFYICONDATA data; -0q|AB<  
 data.cbSize=sizeof(NOTIFYICONDATA); 68bvbig  
 CString tip; gCsN\z  
 tip.LoadString(IDS_ICONTIP); NTX0vQG  
 data.hIcon=GetIcon(0); WY>$.e  
 data.hWnd=GetSafeHwnd(); U5-8It2OR  
 strcpy(data.szTip,tip); |.RyF@N`T  
 data.uCallbackMessage=IDM_SHELL; $X-PjQb1Bb  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \ ;]{`  
 data.uID=98; kmTYRl )j  
 Shell_NotifyIcon(NIM_ADD,&data); _3%:m||,XP  
 ShowWindow(SW_HIDE); XNx$^I=  
 bTray=TRUE; gQSVPbzK  
} '?m2|9~  
~vpF|4Zn5  
void CCaptureDlg::DeleteIcon() M0C)SU5"  
{ 1k:yU(  
 NOTIFYICONDATA data; ud)WH|Z  
 data.cbSize=sizeof(NOTIFYICONDATA); C4PT(cezR  
 data.hWnd=GetSafeHwnd(); s&o9LdL  
 data.uID=98; 6RxI9{ry  
 Shell_NotifyIcon(NIM_DELETE,&data); *) B \M>  
 ShowWindow(SW_SHOW); xc @$z* w  
 SetForegroundWindow(); VFF5 Tp  
 ShowWindow(SW_SHOWNORMAL); CDtL.a\  
 bTray=FALSE; RuVk>(?WK%  
} 1Zp/EYWa{  
cs\=8_5  
void CCaptureDlg::OnChange() oI`Mn3N  
{ YWd2bRb  
 RegisterHotkey(); 2uT6M%OC  
} t>%b[(a  
H!}L(gjEG  
BOOL CCaptureDlg::RegisterHotkey() (ot56`,k  
{ ; \co{_&D  
 UpdateData(); ^|vk^`S  
 UCHAR mask=0; rq7yNt  
 UCHAR key=0; ]Oo!>iTQi  
 if(m_bControl) t1 9f%d  
  mask|=4; NWiDNK[VE}  
 if(m_bAlt) &@{`{  
  mask|=2; +PsR*T  
 if(m_bShift) N lm}'Xt  
  mask|=1; h"8[1 ;  
  key=Key_Table[m_Key.GetCurSel()]; ZBY}Mz$  
 if(bRegistered){ UJp'v_hN  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6A5.n?B{  
  bRegistered=FALSE; :+QNN<  
 } (JdheCq!x  
 cMask=mask; Hr}"g@ <  
 cKey=key; h7K,q  S  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 7z,  $  
 return bRegistered; *]<=04v]R  
} tFn[U#'  
,3}+t6O"  
  四、小结 &Q"vXs6Gt  
3I}AA.h'00  
  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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