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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: q{HfT d  
  ~^cx a%  
  一、实现方法 `9n%Dy<  
9}Ud'#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: uV!Ax *'  
L}*:,&Y/  
#pragma data_seg("shareddata") {O9CYP:  
HHOOK hHook =NULL; //钩子句柄 [x ?38  
UINT nHookCount =0; //挂接的程序数目 JziuwL5,  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Lg0Vn&k  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 tT'*Uu5  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey T$5u+4>"  
static int KeyCount =0; y Q-&+16^  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 /_5I}{  
#pragma data_seg() _]a8lr+_-  
q{5wx8_U  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 jFY6}WY)}7  
tfW/Mf  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 4NT zK  
")'o5V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR REUWK#>  
cKey,UCHAR cMask) {"$ Q'T  
{ pXf!8X&y  
 BOOL bAdded=FALSE; d0$dQg  
 for(int index=0;index<MAX_KEY;index++){ <NZ^*]  
  if(hCallWnd[index]==0){ k~Qb"6n2  
   hCallWnd[index]=hWnd; .V G$`g"  
   HotKey[index]=cKey; f_a.BTtNO  
   HotKeyMask[index]=cMask; <3C~<  
   bAdded=TRUE; i1k(3:ay<  
   KeyCount++; =!u9]3)  
   break; 7Gb1[3  
  } k~f3~-"  
 } sk !92mQ  
 return bAdded; fq(r,h=|  
} EN6a? }5  
//删除热键 RU&,z3LEb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t I}@1  
{ 7KIOI,qb6  
 BOOL bRemoved=FALSE; KNT(lA0s  
 for(int index=0;index<MAX_KEY;index++){ 9l) .L L  
  if(hCallWnd[index]==hWnd){ 7 j$ |fS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ W/_=S+CvK  
    hCallWnd[index]=NULL; \l!^6G|c  
    HotKey[index]=0; P'f0KZL;  
    HotKeyMask[index]=0; 62lG,y_L  
    bRemoved=TRUE; HDqPqrWm  
    KeyCount--; LDlj4>%pW^  
    break; VK\ Bjru9  
   } "#bL/b'{  
  } [P,YW|:n  
 } C@+"d3  
 return bRemoved; 3GVE/GtU  
} )9'eckt  
*>Sb4:  
l%"[857  
  DLL中的钩子函数如下: k^3 ?Z2a  
Z#7T!/28  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) *:t]|$;E\  
{ i!8 o(!I  
 BOOL bProcessed=FALSE; o('W2Bs-o  
 if(HC_ACTION==nCode) <hlH@[7!  
 { Y"qKe,  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Uw R,U#d  
   switch(wParam) H|8vW  
   {  DVCO( fz  
    case VK_MENU: ,4dES|)sP  
     MaskBits&=~ALTBIT; ?"MJ'u  
     break; 6<0-GD}M  
    case VK_CONTROL: +g36,!q  
     MaskBits&=~CTRLBIT; 'Okitq+O  
     break; ! K? o H  
    case VK_SHIFT: bz!9\D|h  
     MaskBits&=~SHIFTBIT; hKq <e%oVH  
     break; weQC9e~d{-  
    default: //judge the key and send message YrAaL"20  
     break; 9L3#aE]C  
   } +N0V8T%~z.  
   for(int index=0;index<MAX_KEY;index++){ 6GVj13Nr  
    if(hCallWnd[index]==NULL) qc^ u%  
     continue; \+OP!`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O8BxXa@5  
    { $47cKit|k:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~doOt  
     bProcessed=TRUE; #fg RF  
    } &.k'Dj2hf  
   } LF+#PnK  
  } SI_{%~k*B  
  else if((lParam&0xc000ffff)==1){ //有键按下 hDc, #~!  
   switch(wParam) `_{'qqRhe  
   { 1B~H*=t4h  
    case VK_MENU: <p<jXwl  
     MaskBits|=ALTBIT; =x "N0p  
     break; dP0!?J Y  
    case VK_CONTROL: #5HJW[9  
     MaskBits|=CTRLBIT; S!gV\gEbDj  
     break; Alh"G6  
    case VK_SHIFT: %XGwQB$zk8  
     MaskBits|=SHIFTBIT; i|u3Qt5  
     break; =8OPj cX.V  
    default: //judge the key and send message H?8uy_Sc  
     break; :w_J/k5Zd  
   } kJIKULf  
   for(int index=0;index<MAX_KEY;index++){ T 1m097  
    if(hCallWnd[index]==NULL) P\bW kp0  
     continue; cad1eOT'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {xr!H-9ZAA  
    { GIQ/gM?Pv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); SZJ~ktXC-V  
     bProcessed=TRUE; \XwXs 5"G  
    } X~abn7_  
   } *=}$@O S  
  } *1iJa  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 drT X  
   for(int index=0;index<MAX_KEY;index++){ -Zfzl`r  
    if(hCallWnd[index]==NULL) "^~f.N  
     continue; (PU0\bGA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) K' N`rx.7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |;{^Mci%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 c>d+q9M  
   } `.nkC_d  
  } jeMh  
 } #: L|-_=a  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Uj}iMw,  
} ' U{?"FP  
Fc>W]1  
  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: :av6*&+  
c_a*{L|c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Bn*D<<{T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {/12.y=)~  
<jU[&~p  
  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: ch,<4E/c[R  
c:"*MM RC  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) k!O#6Z  
{ 7~TE=t  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /HH5Mn*  
 { T#?KY  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 cX"[#Em#  
  SaveBmp(); D8slSX`6j  
  return FALSE; C/%umazP9  
 } ]hTYh^'e  
 …… //其它处理及默认处理 qJB9z0a<Ov  
} ga^O]yK  
Y TxUKE:  
2?rg&og6  
  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。 34U/"+|z  
NZYtA7  
  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。 RvV4SlZz  
NS6Bi3~  
  二、编程步骤 1t=Y+|vA9  
Wcn3\v6_  
  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 J#U;GL  
j(6:   
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; wA) NB  
j2deb`GD  
  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; //`heFuc]>  
fm87?RgXD  
  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; DzO0V"+H}k  
PTIC2  
  5、 添加代码,编译运行程序。 bP&o] ?dN  
IV_u f  
三、程序代码 `rW{zQYM  
h1G]w/.ws  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Df02#493  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \bqNjlu  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ C\dQ6(3}\  
#if _MSC_VER > 1000 V\%;S  
#pragma once :ZL;wtT  
#endif // _MSC_VER > 1000 F}<&@7kF  
#ifndef __AFXWIN_H__ 6Z ~>d;&9  
#error include 'stdafx.h' before including this file for PCH D; H</5#Q  
#endif *ZyIbT  
#include "resource.h" // main symbols &5Ea6j  
class CHookApp : public CWinApp [=u8$5/a  
{ aoz+g,1 //  
 public: *pw:oTO  
  CHookApp(); f[.RAHjk  
  // Overrides 7'7bIaJk  
  // ClassWizard generated virtual function overrides 3 l->$R]  
  //{{AFX_VIRTUAL(CHookApp) kI]i,v#F  
 public: 5&v'aiWK  
  virtual BOOL InitInstance(); qi`*4cas*A  
  virtual int ExitInstance(); B@e,3:  
  //}}AFX_VIRTUAL *58<.L|  
  //{{AFX_MSG(CHookApp) @jN!j*Y H  
  // NOTE - the ClassWizard will add and remove member functions here. yopEqO  
  // DO NOT EDIT what you see in these blocks of generated code ! FoWE<  
  //}}AFX_MSG Thn-8DT  
  DECLARE_MESSAGE_MAP() ^=bJ _'  
}; huWUd)Po%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);  /8Bh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jIv+=b#oT  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <tuh%k  
BOOL InitHotkey(); ].pz  
BOOL UnInit(); bPC {4l  
#endif [{6]iJ  
\r^=W=  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. K:z|1V  
#include "stdafx.h" x^8xz5:O  
#include "hook.h" dwv xV$Nt  
#include <windowsx.h> #p&iH9c_  
#ifdef _DEBUG 91E!4t}I  
#define new DEBUG_NEW [WXtR  
#undef THIS_FILE KArf:d  
static char THIS_FILE[] = __FILE__; Zg5@l3w  
#endif |Q`}a %  
#define MAX_KEY 100 kGc;j8>."  
#define CTRLBIT 0x04 2U2=ja9:Y  
#define ALTBIT 0x02 5aL0N  
#define SHIFTBIT 0x01 |iLeOztuE  
#pragma data_seg("shareddata") p+snBaAo}  
HHOOK hHook =NULL; S"CsY2;  
UINT nHookCount =0; 0fxA*]h  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !O@qqg(>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT "}*P9-%  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey j,/OzVm9  
static int KeyCount =0; D2E~ c? V  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1{_tV^3@  
#pragma data_seg() ~PHAC@pU  
HINSTANCE hins; F:n(yXA  
void VerifyWindow(); Y gQ_P4B;  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $ n`<,;^l  
//{{AFX_MSG_MAP(CHookApp) @,CCwiF'q  
// NOTE - the ClassWizard will add and remove mapping macros here. MM|&B`v@;  
// DO NOT EDIT what you see in these blocks of generated code! }=^YLu=  
//}}AFX_MSG_MAP MkC25  
END_MESSAGE_MAP() McNj TD  
5Jp@n .  
CHookApp::CHookApp()  8y OzD  
{ kFHqQs aG  
 // TODO: add construction code here,  ZajQ B  
 // Place all significant initialization in InitInstance |bi"J;y  
} UB|Nx(V s  
2Q|Vg*x\U  
CHookApp theApp; g 4=}].  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) t.j q]L  
{ )Y\},O  
 BOOL bProcessed=FALSE; Iu 2RK  
 if(HC_ACTION==nCode) r}WV"/]p  
 { 8niQG']  
  if((lParam&0xc0000000)==0xc0000000){// Key up }z,4IHNn  
   switch(wParam) x(hUQu 6  
   { Wgq*|teW  
    case VK_MENU: "}\z7^.W>  
     MaskBits&=~ALTBIT; -[~{c]/c  
     break; pA!+;Y!ZB<  
    case VK_CONTROL: |5F]y"Nb  
     MaskBits&=~CTRLBIT;  []1VD#  
     break; RA+Y./*h  
    case VK_SHIFT: / ]>&OSV  
     MaskBits&=~SHIFTBIT; hnvn&{|  
     break; mz+>rc  
    default: //judge the key and send message xaoaZ3Ko  
     break; A>%fE 6FY  
   } H[*.Jd  
   for(int index=0;index<MAX_KEY;index++){ . m7iXd{  
    if(hCallWnd[index]==NULL) *Y9"-C+  
     continue; <gZC78}E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) AQbbIngo  
    { [ \V]tpl!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .J%}ROm  
     bProcessed=TRUE; Zr;.`(>  
    } NqkRR$O  
   } ?qHW"0Tjn  
  } gD _tBv  
  else if((lParam&0xc000ffff)==1){ //Key down lk}R#n$  
   switch(wParam) 'iXjt MX  
   { Mn7 y@/1  
    case VK_MENU: w I #_r_  
     MaskBits|=ALTBIT; z/F(z*'v  
     break; QD+dP nZu  
    case VK_CONTROL: w<J$12 "p+  
     MaskBits|=CTRLBIT; 2(5wFc  
     break; `2J6Dz"W  
    case VK_SHIFT: `;hsOfo  
     MaskBits|=SHIFTBIT; oE"!  
     break; Z!G;q}zZ!  
    default: //judge the key and send message GaSk &'n$Y  
     break; +TpM7QaL  
   } UB.FX  
   for(int index=0;index<MAX_KEY;index++) h[C!cX  
   { yf3%g\k  
    if(hCallWnd[index]==NULL) {Ylj]  
     continue; 9H1R0iWW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \r324Bw>2  
    { q}ZZqYk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "o<:[c9/  
     bProcessed=TRUE; 9V.)=*0hp  
    } k#JFDw\  
   } S?OK@UEJ  
  } s]5wzbFO  
  if(!bProcessed){ @K4} cP  
   for(int index=0;index<MAX_KEY;index++){ J0d +q!  
    if(hCallWnd[index]==NULL) ,BW ^j.7  
     continue; 7xwS  .|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) BG-uKJ ^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =H>rX 2k  
   } #MHn J  
  } KP _=#KD  
 } wjq f u /  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5>KAVtYvc  
} -g IuL  
T oy~\  
BOOL InitHotkey() :n0(gB  
{ >]T(}S~  
 if(hHook!=NULL){ +3s i=x\=/  
  nHookCount++; [5)1 4% x  
  return TRUE; .DHZs#R  
 } S'Yg!KwX  
 else s:*gjoL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Z)P x6\?+  
  if(hHook!=NULL) L(`^T`  
   nHookCount++; Yah3I@xGy  
  return (hHook!=NULL); @o9EX }  
} [ ]3xb`<&  
BOOL UnInit() #mk#&i3"k  
{ hB P]^~(  
 if(nHookCount>1){ 7R7g$  
  nHookCount--; Te$/[`<U  
  return TRUE; S &s7]  
 } lH:TE=|4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Z:O24{ro5  
 if(unhooked==TRUE){ 7fI[yCh  
  nHookCount=0; kzJNdYtdH  
  hHook=NULL; jt Q2vJ-  
 } |A'8'z&q  
 return unhooked; R!*UU'se  
} bt%k;Z]  
f@\ k_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v{Zh!mk* L  
{ |WXu;uf$.u  
 BOOL bAdded=FALSE; %CF(SK2w  
 for(int index=0;index<MAX_KEY;index++){ ukS@8/eJ  
  if(hCallWnd[index]==0){ Bwb3@vNA  
   hCallWnd[index]=hWnd; %L/Wc,My  
   HotKey[index]=cKey; ppb]RN|)  
   HotKeyMask[index]=cMask; wA.YEI|CSj  
   bAdded=TRUE; S.t+HwVodO  
   KeyCount++; %3fHitCikc  
   break; [NeOd77y  
  } Y&Pi`E9=  
 } ``w,CP ?  
 return bAdded; C~'}RM  
} dMeDQ`c`W  
*/nb%QV  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iP|h];a+@  
{ Va(R*38k  
 BOOL bRemoved=FALSE;  B*Hp  
 for(int index=0;index<MAX_KEY;index++){ k/?+jb  
  if(hCallWnd[index]==hWnd){ ?h1]s&^| 2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hP3I_I[qF}  
    hCallWnd[index]=NULL; 5{,/m"-  
    HotKey[index]=0; zhHQJcQ.  
    HotKeyMask[index]=0; `u%//m_(  
    bRemoved=TRUE; !fzqpl\ze  
    KeyCount--; ua`2 & ;T=  
    break; e{To&gy~  
   } E^A9u |x  
  } +c}fDrr)  
 } T>vHZZiO  
 return bRemoved; 7k+UCi u>  
} lsJ'dS  
tz1iabZ{  
void VerifyWindow() .Ks&r  
{ ^YenS6`F  
 for(int i=0;i<MAX_KEY;i++){ (cNT ud$  
  if(hCallWnd!=NULL){ Wf0ui1@  
   if(!IsWindow(hCallWnd)){ o2a`4K  
    hCallWnd=NULL; Kk9 JZ[nT'  
    HotKey=0; 7S2Bm]fP  
    HotKeyMask=0; {r[ *}Bv  
    KeyCount--;  PovPO  
   } :V}8a!3h  
  } =]-!  
 } N+HN~'8r  
} Ug3PZ7lK  
2#T|+mKxZM  
BOOL CHookApp::InitInstance() ~u,g5  
{ xx!o]D-}  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); WQiEQ>6(t(  
 hins=AfxGetInstanceHandle(); S3)JEZi  
 InitHotkey(); /A|ofAr)  
 return CWinApp::InitInstance(); V)!Oss;i  
} CM9+h;Zm  
N5%~~JRO  
int CHookApp::ExitInstance() |I)xK@7  
{ mQ VduG  
 VerifyWindow(); 2ZIf@C{P.  
 UnInit(); 6$fC R  
 return CWinApp::ExitInstance(); 'qQ DM_+  
} wqA5GK>m2  
t~sW]<qjp  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file F[RhuNa&'W  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) '~liDz*O   
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ /YUf(' b  
#if _MSC_VER > 1000 @_N -> l  
#pragma once 0e:KiUr  
#endif // _MSC_VER > 1000 k(%RX _]C  
N;r,B  
class CCaptureDlg : public CDialog Lm-}W "7  
{ "pMXTRb  
 // Construction 4zJ9bF4  
 public: 6Oo'&3@  
  BOOL bTray; "i_tO+  
  BOOL bRegistered; C[gSiL  
  BOOL RegisterHotkey(); =k3QymA  
  UCHAR cKey; 47$JN}qI0  
  UCHAR cMask; FCqs'  
  void DeleteIcon(); Y*wbFL6`  
  void AddIcon(); ; h/Y9uYn  
  UINT nCount; 8b6:n1<fn  
  void SaveBmp(); JK,#dA#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor r'xa' 6&  
  // Dialog Data Z;WqKIM#  
  //{{AFX_DATA(CCaptureDlg) r~t&;yRv  
  enum { IDD = IDD_CAPTURE_DIALOG }; M7jDV|Go  
  CComboBox m_Key; q'  _  
  BOOL m_bControl; :4(7W[r6  
  BOOL m_bAlt; >A2& Mjo  
  BOOL m_bShift; P d*}0a~  
  CString m_Path; }c&Zv#iO6  
  CString m_Number; [0)iY%^  
  //}}AFX_DATA H(?z?2b p  
  // ClassWizard generated virtual function overrides {(xNC#   
  //{{AFX_VIRTUAL(CCaptureDlg) 6@Eip[e  
 public: NbkWy  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 63:ZDQ  
 protected: [DjdR_9*I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L6l~!bEc  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); __3Cjo^6&  
  //}}AFX_VIRTUAL z%mM#X  
  // Implementation nNBxT+3*i  
 protected: zZ;tSKL  
  HICON m_hIcon; !u4oo-  
  // Generated message map functions < >f12pu  
  //{{AFX_MSG(CCaptureDlg) y1k""75  
  virtual BOOL OnInitDialog(); ?*}V>h 8m)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ;y"E}h  
  afx_msg void OnPaint(); w9.r`_-  
  afx_msg HCURSOR OnQueryDragIcon(); oX?2fu-  
  virtual void OnCancel(); QM;L>e-ZY  
  afx_msg void OnAbout(); QdDdrR^&  
  afx_msg void OnBrowse(); hnE@+(d=qJ  
  afx_msg void OnChange(); M=0I 3o}J  
 //}}AFX_MSG QD"V=}'?  
 DECLARE_MESSAGE_MAP() `"-)ObOj}  
}; I?F^c6M=  
#endif :2?i9F0_  
if^\Gs$  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file q;B-np?U  
#include "stdafx.h" VQqEsnkz  
#include "Capture.h" (M5=8g%>d  
#include "CaptureDlg.h" ,F:l?dfB\I  
#include <windowsx.h> `<\AnhNW]I  
#pragma comment(lib,"hook.lib") .F 3v)  
#ifdef _DEBUG NGS/lKz  
#define new DEBUG_NEW 8 wC3}U  
#undef THIS_FILE o*r\&!NIw  
static char THIS_FILE[] = __FILE__; a*%>H(x  
#endif <=jE,6_|  
#define IDM_SHELL WM_USER+1 (h`||48d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i~l0XjQbs  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); DSET!F;PG  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \[Rh\v&  
class CAboutDlg : public CDialog C/ ;f)k<  
{ H;IG\k6C  
 public: G}f.fR Y  
  CAboutDlg(); -Ux/ Ug@  
  // Dialog Data ds7I .Q'  
  //{{AFX_DATA(CAboutDlg) M@{GT/`Pf  
  enum { IDD = IDD_ABOUTBOX }; =@{H7z(p&  
  //}}AFX_DATA hc~--[1c:  
  // ClassWizard generated virtual function overrides Mx$VAV^\  
  //{{AFX_VIRTUAL(CAboutDlg) PtmdUHvD  
 protected: bk#u0N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]6$NU [  
  //}}AFX_VIRTUAL gD&%$&q  
  // Implementation o.Q |%&1  
 protected: { -<h5_h@  
  //{{AFX_MSG(CAboutDlg) N:gS]OI*  
  //}}AFX_MSG m<"1*d~  
  DECLARE_MESSAGE_MAP() &o:ZOD.  
}; pm<<!`w"  
f9OVylm  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) OL=IUg"  
{ E})PNf;  
 //{{AFX_DATA_INIT(CAboutDlg) ^HC! my  
 //}}AFX_DATA_INIT 6>bKlYl&9  
} }54\NSj0  
ab3" ?.3m  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )"j_ NlO  
{ ?^,GaZ^V  
 CDialog::DoDataExchange(pDX); x?Q;o+2v  
 //{{AFX_DATA_MAP(CAboutDlg) nQ/(*d  
 //}}AFX_DATA_MAP CEI#x~Oq  
} qYbod+UX  
V3F2Z_VH2  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0/-[k  
 //{{AFX_MSG_MAP(CAboutDlg) &/a/V  
 // No message handlers e2/[`k=7-  
 //}}AFX_MSG_MAP EY> %#0  
END_MESSAGE_MAP() dd98v Vj  
+ Uj~zx@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #(XP=PUj  
: CDialog(CCaptureDlg::IDD, pParent) ]+fL6"OD/2  
{ sQTW?KA-Te  
 //{{AFX_DATA_INIT(CCaptureDlg) sA}=o.\j:  
  m_bControl = FALSE; -+O8v;aC'  
  m_bAlt = FALSE; p?6w/n  
  m_bShift = FALSE; X*d,z~k%*d  
  m_Path = _T("c:\\"); #gi&pR'$  
  m_Number = _T("0 picture captured."); ZTHr jW1  
  nCount=0; lC^q}Bh:  
  bRegistered=FALSE; %Ix^Xb0  
  bTray=FALSE; +O\6p  
 //}}AFX_DATA_INIT $yc&f(Tv  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 TLO-$>h  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); umD .  
} o5AyJuS-u$  
cBc6*%ZD  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) % sT=>\  
{ 9SMM%(3, r  
 CDialog::DoDataExchange(pDX); fa"eyBO50  
 //{{AFX_DATA_MAP(CCaptureDlg) 4sROMk=l  
  DDX_Control(pDX, IDC_KEY, m_Key); # Wh"_zpM+  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); j3A+:KDn3n  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 5E}0 <&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); T>W(Caelq  
  DDX_Text(pDX, IDC_PATH, m_Path); 8fZ\})t  
  DDX_Text(pDX, IDC_NUMBER, m_Number); >Li ~Og@  
 //}}AFX_DATA_MAP ygT,I+7\  
} saYn\o"m  
tA'i-D&  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *>Om3[D  
//{{AFX_MSG_MAP(CCaptureDlg) xR;Xx;  
 ON_WM_SYSCOMMAND() D`,@EW].  
 ON_WM_PAINT() w;{k\=W3Ff  
 ON_WM_QUERYDRAGICON() a08B8  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) RC\TPG/8!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ,]20I _  
 ON_BN_CLICKED(ID_CHANGE, OnChange) =XudL^GF  
//}}AFX_MSG_MAP 'pZ~3q  
END_MESSAGE_MAP() ZhM-F0;`  
hq\KSFP  
BOOL CCaptureDlg::OnInitDialog() uK): d&]Ux  
{ =a7m^e7  
 CDialog::OnInitDialog(); 5C{X$7u  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0*q~(.>a  
 ASSERT(IDM_ABOUTBOX < 0xF000); Og-M nx3  
 CMenu* pSysMenu = GetSystemMenu(FALSE); H+_oK ]/  
 if (pSysMenu != NULL) E/AM<eN  
 { AB+Zc ]  
  CString strAboutMenu; )mwY] !  
  strAboutMenu.LoadString(IDS_ABOUTBOX); G{ F>=z"(l  
  if (!strAboutMenu.IsEmpty()) KasOh"W.P  
  { O(WFjmHx  
   pSysMenu->AppendMenu(MF_SEPARATOR); EL~s90C  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _VR4 |)1g  
  } _v]I6<!5U  
 } v-OGY[|97  
 SetIcon(m_hIcon, TRUE); // Set big icon hFQC%N. '  
 SetIcon(m_hIcon, FALSE); // Set small icon ZFrK'BvbR  
 m_Key.SetCurSel(0); 5nf|CQH6?  
 RegisterHotkey(); ?55('+{l  
 CMenu* pMenu=GetSystemMenu(FALSE); o)1wF X  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); T /[)U  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); L\hPw{)  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); o{>hOs &  
 return TRUE; // return TRUE unless you set the focus to a control =U|J{^ >I  
} ls #O0  
F"B!r-J  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @A$%baH0  
{ 0ZPPt(7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) kl2]#G(  
 { !.3 MtXr  
  CAboutDlg dlgAbout; Uc7X)  
  dlgAbout.DoModal(); @LwhQ  
 } ?9=yo5M}  
 else b/ZX}<s(1=  
 { $OjsaE %  
  CDialog::OnSysCommand(nID, lParam); {n.g7S~  
 } %y8w9aGt  
} t}*teo[  
Eb{TKz?  
void CCaptureDlg::OnPaint() r("7 X2f  
{ P[gk9{sv  
 if (IsIconic()) P=u)Q _  
 { 1d-j_ H`s  
  CPaintDC dc(this); // device context for painting -Ca.:zX  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); d@#=cvW  
  // Center icon in client rectangle ed\,FWR  
  int cxIcon = GetSystemMetrics(SM_CXICON); Z\dILt:#z  
  int cyIcon = GetSystemMetrics(SM_CYICON); zxwpS  
  CRect rect; eZ  ]6 Q  
  GetClientRect(&rect); K8e>sU.  
  int x = (rect.Width() - cxIcon + 1) / 2; GI6 EZ}.MZ  
  int y = (rect.Height() - cyIcon + 1) / 2; <_42h|-  
  // Draw the icon fI}-?@  
  dc.DrawIcon(x, y, m_hIcon); s'LG3YV-<  
 } vz@QGgQ9~2  
 else QouTMS-b  
 { U/jJ@8  
  CDialog::OnPaint(); S:^Q(w7  
 } [~jh Ov^  
} wBeOMA  
sy>Pn  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3c-ve$8u~  
{ M_*w)<  
 return (HCURSOR) m_hIcon; " I_T  
} -,XS2[  
~r>WnI:vg  
void CCaptureDlg::OnCancel() 's&Vg09D,  
{ !q7M+j4  
 if(bTray) HjV^6oP  
  DeleteIcon(); QjZ}*p  
  CDialog::OnCancel(); O`@$YXuD  
} 4&`66\p;  
8mCr6$|%  
void CCaptureDlg::OnAbout() .X:{s,@  
{ YW/<. 0rI  
 CAboutDlg dlg; C*c=@VAa  
 dlg.DoModal(); y`(z_5ClT  
} jh g!K.A  
T-<^mX[}  
void CCaptureDlg::OnBrowse() }i/{8Ou W  
{ czHO)uQ?d`  
 CString str; lgnF\)  
 BROWSEINFO bi; 2etlR  
 char name[MAX_PATH]; MN1|k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ]%mg(&p4  
 bi.hwndOwner=GetSafeHwnd(); m{V @Om  
 bi.pszDisplayName=name; | sQ5`lV?  
 bi.lpszTitle="Select folder"; "bw4 {pa+  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :uI}"Bp  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); q<;9!2py  
 if(idl==NULL) f$H"|Mb e  
  return; [n< U>up  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); *$hO C%(  
 str.ReleaseBuffer(); lGcHfW)Y  
 m_Path=str; wI`uAZ="  
 if(str.GetAt(str.GetLength()-1)!='\\') s';jk(i3  
  m_Path+="\\"; OZISh?  
 UpdateData(FALSE); `NGCUGQ_7  
} moc_}(  
lhxhAe  
void CCaptureDlg::SaveBmp() <p<gx*%  
{ '!y ^  
 CDC dc; Ay2|@1e  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); SJy?^  
 CBitmap bm; IWMqmCbv  
 int Width=GetSystemMetrics(SM_CXSCREEN); mFo6f\DHr`  
 int Height=GetSystemMetrics(SM_CYSCREEN); C6/,-?%)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,q:6[~n  
 CDC tdc; Mr`u!T&sc  
 tdc.CreateCompatibleDC(&dc); b"f4}b  
 CBitmap*pOld=tdc.SelectObject(&bm); ^K;,,s;0  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); jh=:QP/  
 tdc.SelectObject(pOld); g0iV#i  
 BITMAP btm; kmP0gT{Sj  
 bm.GetBitmap(&btm); t[^}/ S  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Fd ]! 7  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); i5)trSM|  
 BITMAPINFOHEADER bih; ['sIR+c%'O  
 bih.biBitCount=btm.bmBitsPixel; ZegsV|  
 bih.biClrImportant=0; OCR x|  
 bih.biClrUsed=0; al" 1T-  
 bih.biCompression=0; (-~tb-  
 bih.biHeight=btm.bmHeight; w|RG  
 bih.biPlanes=1; :v&GA s6H  
 bih.biSize=sizeof(BITMAPINFOHEADER); r]8B6iV  
 bih.biSizeImage=size; U2SxRFs >  
 bih.biWidth=btm.bmWidth; ~v<r\8`OI2  
 bih.biXPelsPerMeter=0; 2{&|%1Jg  
 bih.biYPelsPerMeter=0; @gTpiV2  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8LiRZ"  
 static int filecount=0; VT+GmS  
 CString name; > m5j.GP;  
 name.Format("pict%04d.bmp",filecount++); F.T~txQ~u  
 name=m_Path+name; Ebp8})P/~  
 BITMAPFILEHEADER bfh; .4?M.Z4[  
 bfh.bfReserved1=bfh.bfReserved2=0; v 7Pv&|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); g fO.Ky6  
 bfh.bfSize=54+size; JfC.U,7Nc  
 bfh.bfOffBits=54; LkNfcBa_  
 CFile bf; -|V@zSKr3  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ kQ4%J, 7e4  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9hLPo  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); .8wR;^  
  bf.WriteHuge(lpData,size); N8m^h:b  
  bf.Close(); a0AIq44  
  nCount++; ) Oa"B;\j  
 } LsBDfp5/  
 GlobalFreePtr(lpData); @.MM-  
 if(nCount==1) Hm4lR{A  
  m_Number.Format("%d picture captured.",nCount);  V+(  
 else qjTz]'^BpM  
  m_Number.Format("%d pictures captured.",nCount); )zr/9aV  
  UpdateData(FALSE); uOZ+9x(  
} S0"O U0`N  
`ORDN|s6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) MR8-xO'w  
{ `W|2Xi=^5  
 if(pMsg -> message == WM_KEYDOWN) lt(,/  
 { /$ L;m  
  if(pMsg -> wParam == VK_ESCAPE) ]c$%;!ZE  
   return TRUE; ^S, "i V  
  if(pMsg -> wParam == VK_RETURN) y ?Q"-o (  
   return TRUE; "hQV\|!\  
 } LscAsq<H<  
 return CDialog::PreTranslateMessage(pMsg); >"ZTyrK  
} QmgwIz_  
-?@ $`{-K  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }eB\k,7L  
{ m,=$a\UC  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ `DJIY_{-2  
  SaveBmp(); hW/*]7AM^  
  return FALSE; z.[L1AGa|s  
} ?u8+F  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ d(fgv  
 CMenu pop; q9Fc0(&Vf  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); HqN|CwGgJ:  
 CMenu*pMenu=pop.GetSubMenu(0); TTqOAo[-Z  
 pMenu->SetDefaultItem(ID_EXITICON); %zX'u.}8#  
 CPoint pt; vqL{~tR  
 GetCursorPos(&pt); 6"%[s@C  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Yh"Z@D[d  
 if(id==ID_EXITICON) b^A&K@[W#,  
  DeleteIcon(); D Zh6/n#q  
 else if(id==ID_EXIT) Q~*A`h#  
  OnCancel(); 0A}'.LI  
 return FALSE; ]qpcA6%a|  
} c#G(7.0MU  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); UayRT#}]  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dQizM^j  
 AddIcon(); Y}|78|q*  
 return res; 40@KL$B=  
} |,yS>kjp  
a(}jn|  
void CCaptureDlg::AddIcon() 29Gej Lg |  
{ e3[QM  
 NOTIFYICONDATA data; Ye )(9  
 data.cbSize=sizeof(NOTIFYICONDATA); DR=>la}!  
 CString tip;  sRoZvp 5  
 tip.LoadString(IDS_ICONTIP); G\P*zz Sq  
 data.hIcon=GetIcon(0); 06=eA0JI  
 data.hWnd=GetSafeHwnd(); r&TxRsg{  
 strcpy(data.szTip,tip); O050Q5zy  
 data.uCallbackMessage=IDM_SHELL; FyY;F;4P  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Q"Bgr&RJ  
 data.uID=98; DO %YOv  
 Shell_NotifyIcon(NIM_ADD,&data); tB1Qr**  
 ShowWindow(SW_HIDE); ob*2V! "  
 bTray=TRUE; JG4&eK$-  
} -7+Fb^"L  
sH&8"5BT%  
void CCaptureDlg::DeleteIcon() 4Uwt--KtFh  
{ E8-p ,e,  
 NOTIFYICONDATA data; |kVxrq  
 data.cbSize=sizeof(NOTIFYICONDATA); c=| a\\  
 data.hWnd=GetSafeHwnd(); L\"=H4r  
 data.uID=98; j+Tk|GRab  
 Shell_NotifyIcon(NIM_DELETE,&data); / Sp+MB9  
 ShowWindow(SW_SHOW); oVsl,V  
 SetForegroundWindow(); K:9.fTCs*  
 ShowWindow(SW_SHOWNORMAL); #Io#OG<7b  
 bTray=FALSE; :m+:%keK  
} pF8'S{y  
LpF6e9V\Wp  
void CCaptureDlg::OnChange() z&- `<uV~  
{ k}<mmKB  
 RegisterHotkey(); kW(8i}bg  
} oiR` \uY  
$23R%8j   
BOOL CCaptureDlg::RegisterHotkey() ?Ts Z_  
{ yBr{nFOgdY  
 UpdateData(); ^^?ECnpcU  
 UCHAR mask=0; 5 WAsEP  
 UCHAR key=0; SE/@li  
 if(m_bControl) 8)H"w$jq  
  mask|=4; N4D_ 43jz  
 if(m_bAlt) 4<O[d  
  mask|=2; ?dTz?C.w  
 if(m_bShift) {`}RYfZ  
  mask|=1; 4mPg; n  
  key=Key_Table[m_Key.GetCurSel()]; ^^%*2^  
 if(bRegistered){ Sa@Xh,y Z  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); c''!&;[!  
  bRegistered=FALSE; "+AeqrYYm5  
 } y[$e]N  
 cMask=mask; ).vdKNzw  
 cKey=key; !AMPA*  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }y0UyOa{C  
 return bRegistered; 8m6L\Z&  
} !WIL|\jbh  
V&f3>#n\  
  四、小结 /Ia#udkNMp  
7%F9.h  
  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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