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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: 39~WP$GM  
  -EU=R_yg  
  一、实现方法 \O~WMN  
WhFE{-!gX  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: m<;MOS  
KAT"!b   
#pragma data_seg("shareddata") d;3f80Kd*  
HHOOK hHook =NULL; //钩子句柄 I;<__  
UINT nHookCount =0; //挂接的程序数目 gId :IR  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 u2':~h?l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 C.}ho.} r  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <8h3)$  
static int KeyCount =0; `sv]/8RN  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 W3X;c*j  
#pragma data_seg() xkkG#n)  
hA`9[58/  
  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。 ]N1,"W}  
nxm*.&#p?  
  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: ;ae6h [  
f?@M"p@T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR `"xzC $  
cKey,UCHAR cMask) Idj Z2)$  
{ UU#$Kt*frR  
 BOOL bAdded=FALSE; JvJ)}d$,&  
 for(int index=0;index<MAX_KEY;index++){ c(3c|n  
  if(hCallWnd[index]==0){ sI4 FgO  
   hCallWnd[index]=hWnd; An BM*5G  
   HotKey[index]=cKey; E*v+@rv  
   HotKeyMask[index]=cMask; nXh<+7  
   bAdded=TRUE; 0U2dNLc  
   KeyCount++; $7Tj<;TV  
   break; |g\CS4$  
  } `y1,VY  
 } 0.wN&:I8t  
 return bAdded; g(F2IpUm/  
} Ds8x9v)^  
//删除热键 2\Yv;J+;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) PJh97%7  
{ JgldC[|7  
 BOOL bRemoved=FALSE; ?CpM.{{s  
 for(int index=0;index<MAX_KEY;index++){ <.@w%rvG  
  if(hCallWnd[index]==hWnd){ 368H6 Jj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u/`x@u  
    hCallWnd[index]=NULL; _`9WNJiL  
    HotKey[index]=0; r"lh\C|  
    HotKeyMask[index]=0; Lo9 \[4FP  
    bRemoved=TRUE; _<)HFg6  
    KeyCount--; ZB,UQ~!Yr  
    break; uF T5Z  
   } (`f)Tt=`  
  } v XR27  
 } sDy~<$l?  
 return bRemoved; Nw3IDy~T  
} ^Ov+n1,)  
K$ |!IXs  
^cojETOv  
  DLL中的钩子函数如下: 3,@|kN<  
~rbJtz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) l{3ZN"`I  
{ ,Q8h#0z r  
 BOOL bProcessed=FALSE; ]=%u\~AvL  
 if(HC_ACTION==nCode) p,2H8I){  
 { *18J$  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }ev+WIERQV  
   switch(wParam) V8z*mnD  
   {  'i8?]` T  
    case VK_MENU: x1QL!MB  
     MaskBits&=~ALTBIT; I,?!NzB  
     break; d%ncI0f`  
    case VK_CONTROL: \ id(P3M  
     MaskBits&=~CTRLBIT; S2 YxA  
     break; G#z9=NF~V  
    case VK_SHIFT: +PHuQ  
     MaskBits&=~SHIFTBIT; ;DI"9  
     break; q%Lw#f  
    default: //judge the key and send message -"n8Wv  
     break; Z , 98  
   } 7, :l\t  
   for(int index=0;index<MAX_KEY;index++){ xh!aB6m8R  
    if(hCallWnd[index]==NULL) lJBZ0  
     continue; ]+AgXUrbOD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jD_B&MQz  
    { ~RnBs`&!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >tV:QP]Y  
     bProcessed=TRUE; 3+:uV  
    } 8B7,qxZ  
   } 6)#%36rP  
  } _1HEGX\  
  else if((lParam&0xc000ffff)==1){ //有键按下 z_9q T"vF  
   switch(wParam) l)91v"vJ  
   { hHqsI`7c  
    case VK_MENU: LfG$?<}hR  
     MaskBits|=ALTBIT; W:=CpbwENX  
     break; I6F $@  
    case VK_CONTROL: \W})Z72  
     MaskBits|=CTRLBIT; 0Ewt >~n  
     break; =zKbvwe%X  
    case VK_SHIFT: *", BP]]  
     MaskBits|=SHIFTBIT;   [IW6F  
     break; 'd|E>8fejG  
    default: //judge the key and send message kX]p;C  
     break; 3O'X;s2\d  
   } |0a GX]Y  
   for(int index=0;index<MAX_KEY;index++){ ` oXL  
    if(hCallWnd[index]==NULL) b 'yW+  
     continue; rZ7)sE5L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Zl`sY5{1  
    { 0i9C\'W`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); D z5(v1I9A  
     bProcessed=TRUE; FuZLE%gP  
    } 3+# "4O  
   } >dqeGM7Np>  
  } g4>1> .s  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 i"C?6R  
   for(int index=0;index<MAX_KEY;index++){ mnWbV\VY  
    if(hCallWnd[index]==NULL) ]$96#}7N  
     continue; $ *^E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q\<^ih51  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wPU<jAQyp  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Y=N; Bj  
   } ='|HUxFi  
  } U?Icyn3q0  
 } M 4TFWOC1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); wC[Bh^]  
} #NLLl EE  
A4uDuB;;ZQ  
  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: Sk,9<@  
p~THliwd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w~(x*R}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tpi>$:e  
V2?&3Z) W  
  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: Yl6\}_h`  
-'!%\E;5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m}3POl/*j  
{ R7 *ek_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Q35/Sp[;x  
 { p;rG aLo:u  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 z~BrKdS  
  SaveBmp(); A{Q:,S)  
  return FALSE; zl !`*{T{  
 } O/=i'0X v  
 …… //其它处理及默认处理 [oQ&}3\XJ  
} k99ANW  
-cHX3UAEI  
pQ Y.MZSA  
  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。 6uijxia  
k98}Jx7J)"  
  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。 :K6(`J3Y"^  
d>Z{TFY  
  二、编程步骤 q(yw,]h]{  
NX(.Lw}  
  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"; nJ4CXSdE  
yv<0fQ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 1+^L,-k!  
=R^V[zTn_  
  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; \8!&X cA  
/N ^%=G#  
  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; nV0"q|0K;  
M#qZ0JT4  
  5、 添加代码,编译运行程序。 snBC +`-  
[D H@>:"dd  
三、程序代码 *s6MF{Ds  
%XqLyeOS  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL -< 7KW0CA  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) e.0vh?{\  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ,diV;d  
#if _MSC_VER > 1000 rY>{L6d  
#pragma once `C`_2y8  
#endif // _MSC_VER > 1000 AX%9k  
#ifndef __AFXWIN_H__ +6!.)Ea=  
#error include 'stdafx.h' before including this file for PCH )(&g\  
#endif qfY.X&]PU  
#include "resource.h" // main symbols |Js96>B:  
class CHookApp : public CWinApp Y 1 i!  
{ c(bh i  
 public: 3Lq?Y7#KQp  
  CHookApp(); mLO{~ruu  
  // Overrides h.QKbbDj  
  // ClassWizard generated virtual function overrides R9yK"  
  //{{AFX_VIRTUAL(CHookApp) XQk9 U  
 public: 7;n'4LIa9  
  virtual BOOL InitInstance(); doxQS ohS  
  virtual int ExitInstance(); r! 5C3  
  //}}AFX_VIRTUAL oj<.axA,  
  //{{AFX_MSG(CHookApp) *kxk@(lT?  
  // NOTE - the ClassWizard will add and remove member functions here. COj50t/  
  // DO NOT EDIT what you see in these blocks of generated code ! 6kjBd3  
  //}}AFX_MSG ;X\>oV3#  
  DECLARE_MESSAGE_MAP() {P(Z{9u%  
}; q]5"V>D \  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); D;<Q m,[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +iwNM+K/gQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mYb8   
BOOL InitHotkey(); )j@k[}R#g  
BOOL UnInit(); wLU w'Ai  
#endif 0sq/_S  
ag?@5q3J}  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. @}x)>tqD  
#include "stdafx.h" _q=$L eO5  
#include "hook.h" [ WZ<d^L  
#include <windowsx.h> OR( )D~:n  
#ifdef _DEBUG .$4DK*  
#define new DEBUG_NEW ZH`6>:  
#undef THIS_FILE dp2".  
static char THIS_FILE[] = __FILE__; #0L :h ?L  
#endif uHQJ&  
#define MAX_KEY 100 A@_F ;4X  
#define CTRLBIT 0x04 rP;Fh|w#  
#define ALTBIT 0x02 t22BO@gt74  
#define SHIFTBIT 0x01 f8N  
#pragma data_seg("shareddata") dlK#V)  
HHOOK hHook =NULL; *u7C){)gr[  
UINT nHookCount =0; f;pR8  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey klUxt?-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT yi# Nrc5B  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }PyAmh$@  
static int KeyCount =0; F!`.y7hY@  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift o|l)oc6{  
#pragma data_seg() 68)z`JI|<)  
HINSTANCE hins; ,Xk8{ =  
void VerifyWindow(); .(CzsupY_q  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =[t([DG  
//{{AFX_MSG_MAP(CHookApp) xJ>hN@5}i  
// NOTE - the ClassWizard will add and remove mapping macros here. D}cq_|mmn[  
// DO NOT EDIT what you see in these blocks of generated code! 5&2=;?EO  
//}}AFX_MSG_MAP dm.?-u;C  
END_MESSAGE_MAP() LD_aJ^(d  
_\sm$ `q  
CHookApp::CHookApp() L\_8}\  
{ >S5D-)VX  
 // TODO: add construction code here, [JMz~~ F  
 // Place all significant initialization in InitInstance 3'u%[bx E  
} fBD5K3  
$hndb+6q  
CHookApp theApp;  U@m<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) I g-VSQ  
{ <LZvG IMl  
 BOOL bProcessed=FALSE; CL9p/PJ%e  
 if(HC_ACTION==nCode) -Q 6W`*8  
 {  9<[RXY  
  if((lParam&0xc0000000)==0xc0000000){// Key up #5G!lbH  
   switch(wParam) kt X(\Hf!  
   { ./5|i*ow  
    case VK_MENU: JZu7Fb]L9  
     MaskBits&=~ALTBIT; MV9{>xX  
     break; 'n!;7*  
    case VK_CONTROL: 0 "pm7  
     MaskBits&=~CTRLBIT; wvT!NN K2  
     break; @WBy:gV"  
    case VK_SHIFT: W1r-uR  
     MaskBits&=~SHIFTBIT; /kx:BoV  
     break; RU_=VB %  
    default: //judge the key and send message -U%wLkf|  
     break; Sr2c'T"  
   } 4X#>;  
   for(int index=0;index<MAX_KEY;index++){ OX|/yw8  
    if(hCallWnd[index]==NULL) H -.3r  
     continue; Z9=Cw0( w?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *1;<xeVD  
    { &giJO-^ f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #0G9{./C  
     bProcessed=TRUE; JkQ4'$:  
    }  @tDVW *!  
   } M9bb,`X>Q  
  } bhe|q`1,E  
  else if((lParam&0xc000ffff)==1){ //Key down x-y=Jor  
   switch(wParam) 7zR 7v  
   { l4;/[Q>Z  
    case VK_MENU: A "_;.e`  
     MaskBits|=ALTBIT; hs<7(+a  
     break; `Ph4!-6#  
    case VK_CONTROL: d+2I+O03  
     MaskBits|=CTRLBIT; tJHzhH)  
     break; $`l- cSH;  
    case VK_SHIFT: wQM(Lm#Q  
     MaskBits|=SHIFTBIT; gyI5;il~  
     break; ?F?!QrL  
    default: //judge the key and send message & r\z9!   
     break; %0:  (''  
   } ^>9M2O['!s  
   for(int index=0;index<MAX_KEY;index++) x:sTE u@  
   { Rq4\~F?  
    if(hCallWnd[index]==NULL) oB_{xu$6|  
     continue; R['qBHQ?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A`X$jpAn&  
    { k*z)AR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,a5I:V^\  
     bProcessed=TRUE; Fm [,u  
    } 5G\vV]RR&  
   } lW^RwNcd  
  } `n5 )oU2q  
  if(!bProcessed){ 8@b@y|#]X  
   for(int index=0;index<MAX_KEY;index++){ )5&w  
    if(hCallWnd[index]==NULL) ^P&y9dC.  
     continue; ?LvZEiJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) h7*fjw-Xz[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); JRU)AMMU&  
   } q ,}W.  
  } q'c'rN^  
 } sEhdkN}6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7z F29gC  
} Zf?>:P  
&:'Uh W-t  
BOOL InitHotkey() LRB#|PW  
{ 8Jxo;Y  
 if(hHook!=NULL){ X<Vko^vlj  
  nHookCount++; e[R364K  
  return TRUE; lm]4zs /A  
 } g<}K^)x  
 else f&{2G2 O%  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 3}LTEsdM  
  if(hHook!=NULL) OU0\xx1/  
   nHookCount++; (B,CL222x  
  return (hHook!=NULL); v0= ^Hy m  
} }1d 6d3b  
BOOL UnInit() tR0o6s@v/<  
{ B{c,/{=O  
 if(nHookCount>1){ mm:\a-8j  
  nHookCount--; r+ v*(Tu  
  return TRUE; x*bM C&Ea  
 } F!'b_ gmz  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Ngh9+b6[  
 if(unhooked==TRUE){ XP6R$0yN  
  nHookCount=0; $S=lm {  
  hHook=NULL; ddlLS  
 } p# O%<S@?  
 return unhooked; H%Q@DW8~@  
} 9$ UjZ$ v  
)}n`MRDB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x1Z?x,-D"  
{ cKFzn+  
 BOOL bAdded=FALSE; i<)c4  
 for(int index=0;index<MAX_KEY;index++){ tY%c-m  
  if(hCallWnd[index]==0){ :4&qASn  
   hCallWnd[index]=hWnd; q9icj  
   HotKey[index]=cKey; xr)kHJ:v  
   HotKeyMask[index]=cMask; [ o3}K  
   bAdded=TRUE; 2$=?;~  
   KeyCount++; r$R(4q:  
   break; fLct!H3  
  } WR gAc%  
 } Hz%#&E  
 return bAdded; b\dBt#mB!  
} B.0(}@  
mi%d([)%<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vr=iG xD  
{ IkL|bV3E0  
 BOOL bRemoved=FALSE; 'zi5ihiT  
 for(int index=0;index<MAX_KEY;index++){ GT<Y]Dk  
  if(hCallWnd[index]==hWnd){ >L?/Ph%d  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^e<0-uM" s  
    hCallWnd[index]=NULL; (9fqUbG  
    HotKey[index]=0; BLuILE:$  
    HotKeyMask[index]=0; mNWmp_c,1  
    bRemoved=TRUE; }qi6K-,oU  
    KeyCount--; s|%mGt &L  
    break; F+*: >@3  
   } l3b$b%0'  
  } [$OD+@~A2  
 } j}#48{  
 return bRemoved; I6{}S6  
} b ]1SuL  
T"dX)~E;  
void VerifyWindow() >c5Vz^uM{4  
{ FFK79e/5  
 for(int i=0;i<MAX_KEY;i++){ %* vYX0W"  
  if(hCallWnd!=NULL){ -`&4>\o2Lx  
   if(!IsWindow(hCallWnd)){ P/,7CfyPd  
    hCallWnd=NULL; LN" bGe  
    HotKey=0; 5i83(>p3]e  
    HotKeyMask=0;  ORp6  
    KeyCount--; el;^cMY  
   } m:/nw,  
  } K>,Kbs=D6  
 }  ]i=-/  
} M5: f^  
&gIu<*u<  
BOOL CHookApp::InitInstance() f&7SivS#  
{ lk2F]@_kJH  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 3!Rb {  
 hins=AfxGetInstanceHandle(); A WMR0I  
 InitHotkey(); WFjNS'WI_  
 return CWinApp::InitInstance(); ~ AS2$  
} Op~sR^ez  
Yw\} '7  
int CHookApp::ExitInstance() d3&gHt2  
{ [qIi_(%o  
 VerifyWindow(); 5R{ {FD`h  
 UnInit(); \G#Qe*"'K  
 return CWinApp::ExitInstance(); V%<<Udu<  
} gupB8 .!  
N+"Y@X yg  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +r2E5s   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) e ! 6SJ7xC  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~SUA.YuF  
#if _MSC_VER > 1000 3wX{U8mrg  
#pragma once wI1[I  
#endif // _MSC_VER > 1000 Y)hLu:P]  
e,Gv~ae9  
class CCaptureDlg : public CDialog _B 8e 1an  
{ pyT+ba#  
 // Construction LJc w->  
 public: 7B"J x^  
  BOOL bTray; GH7{_@pv8  
  BOOL bRegistered; h$f/NSct2  
  BOOL RegisterHotkey(); E:D1ZV  
  UCHAR cKey; [{}9"zB$x0  
  UCHAR cMask; P>)-uLc~W  
  void DeleteIcon(); x/[i &Gkv  
  void AddIcon(); 5caYA&R  
  UINT nCount; xv$^%(Ujp  
  void SaveBmp(); ^W_}Gd<-#Y  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor i\3BA"ZX  
  // Dialog Data p0qQ(  
  //{{AFX_DATA(CCaptureDlg) c72Oy+#  
  enum { IDD = IDD_CAPTURE_DIALOG }; }<2F]UuR  
  CComboBox m_Key; q)G*"  
  BOOL m_bControl; AU^Wy|i5Q  
  BOOL m_bAlt; SjtGU47$!  
  BOOL m_bShift; 6lT1X)  
  CString m_Path; ]WWre},  
  CString m_Number; ,\+tvrR4X  
  //}}AFX_DATA J}._v\Q7P  
  // ClassWizard generated virtual function overrides DECX18D  
  //{{AFX_VIRTUAL(CCaptureDlg) g"(N_sv?  
 public: $C9<{zX   
  virtual BOOL PreTranslateMessage(MSG* pMsg); &I'~:nWpt  
 protected: Qc[[@=S%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support c`doR(oZ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); O<6/0ub&+h  
  //}}AFX_VIRTUAL >z>UtT:  
  // Implementation }2`S@Rq.WW  
 protected: p\+#`] Q7}  
  HICON m_hIcon; rJ\A)O+Mq(  
  // Generated message map functions sn5N9=\+T  
  //{{AFX_MSG(CCaptureDlg) "sT`Dhr  
  virtual BOOL OnInitDialog(); <' P|g  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?aOR ^ K  
  afx_msg void OnPaint(); 2-j|q6m5  
  afx_msg HCURSOR OnQueryDragIcon(); =!#D UfQf  
  virtual void OnCancel(); R&ou4Y:DG  
  afx_msg void OnAbout(); mKe{y.  
  afx_msg void OnBrowse(); }^`{YD  
  afx_msg void OnChange(); w2+RX-6Ie  
 //}}AFX_MSG s$H5W`3  
 DECLARE_MESSAGE_MAP() Sw5H+!  
}; 1 _5[5K^  
#endif Wv=L_E_  
YgM6z K~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file KOi%zE%  
#include "stdafx.h" zE<vFP-1v  
#include "Capture.h" A: 0] n  
#include "CaptureDlg.h" _x UhDu%  
#include <windowsx.h> Qbv)(&i# ~  
#pragma comment(lib,"hook.lib") Q=^}B}G  
#ifdef _DEBUG ngm7Vs  
#define new DEBUG_NEW #:s'&.6  
#undef THIS_FILE Bj@&c>  
static char THIS_FILE[] = __FILE__; D|=QsWZI  
#endif 1"v;w!uh  
#define IDM_SHELL WM_USER+1 m.V mS7_I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jDXmre?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ioa 1n=j  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; zEO 9TuBO  
class CAboutDlg : public CDialog 0HNe44oI+D  
{ xHD!8 B)  
 public: !kV?h5@Bo  
  CAboutDlg(); ][?GJ"O+U  
  // Dialog Data j<l>+., U  
  //{{AFX_DATA(CAboutDlg) ?nt6vqaV  
  enum { IDD = IDD_ABOUTBOX }; C{2 UPG4x  
  //}}AFX_DATA @&EP& $*  
  // ClassWizard generated virtual function overrides OcSLRN?t  
  //{{AFX_VIRTUAL(CAboutDlg) 9R ugkGy  
 protected: V KR6i  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G53!wIW2:  
  //}}AFX_VIRTUAL O$&p<~  
  // Implementation 7,+:Q Y@  
 protected: l;|1C[V  
  //{{AFX_MSG(CAboutDlg) Q2fa]*Z5  
  //}}AFX_MSG bjvi`jyL3k  
  DECLARE_MESSAGE_MAP() \lY26'  
}; Eydk64 5:3  
~V./*CQ\c  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) aqyXxJS8  
{ CX1'B0=\r  
 //{{AFX_DATA_INIT(CAboutDlg) SQz>e  
 //}}AFX_DATA_INIT 9k *'5(D4S  
} RKBtwZx>f  
#MBYa&Tw7  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (JF\%Yj/  
{ -AffKo  
 CDialog::DoDataExchange(pDX); h,#AY[Q  
 //{{AFX_DATA_MAP(CAboutDlg) FJ2^0s/"  
 //}}AFX_DATA_MAP 3 F4I{L  
} 0#yo\McZ  
M@gm.)d  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) `Y(/G"]  
 //{{AFX_MSG_MAP(CAboutDlg) s+(8KYTs`  
 // No message handlers \y0abxIHS  
 //}}AFX_MSG_MAP  F-ijGGL#  
END_MESSAGE_MAP() )D#*Q~   
N:d" {k  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 9pk<=F  
: CDialog(CCaptureDlg::IDD, pParent) 4W1"=VL[g  
{ IPY@9+]  
 //{{AFX_DATA_INIT(CCaptureDlg) &]ImO RN  
  m_bControl = FALSE; nNL9B~d  
  m_bAlt = FALSE; 2pB@qi-]  
  m_bShift = FALSE; !J+5l&  
  m_Path = _T("c:\\"); (IEtjv}D  
  m_Number = _T("0 picture captured."); 9 s>JdAw?  
  nCount=0; W/&cnp\  
  bRegistered=FALSE; yTmoEy. q  
  bTray=FALSE; Dpof~o,f  
 //}}AFX_DATA_INIT Bh@j6fv  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 m+V'*[O{  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); j[c|np4k\  
} !qy/'v4  
k.rZj|7 L  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) VV?KJz=,W=  
{ P/0n) Q  
 CDialog::DoDataExchange(pDX); 0A|.ch  
 //{{AFX_DATA_MAP(CCaptureDlg) :GO}G`jY  
  DDX_Control(pDX, IDC_KEY, m_Key); ^S[Mg6J  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Qs*g)Yr  
  DDX_Check(pDX, IDC_ALT, m_bAlt); b~cN#w #  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); :,:r  
  DDX_Text(pDX, IDC_PATH, m_Path); CFn!P;.!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /(XtNtO*  
 //}}AFX_DATA_MAP Nno*X9>~  
} e >MC 3D`5  
72Ft?;R  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) J6|5*|*^  
//{{AFX_MSG_MAP(CCaptureDlg) LL.YkYu  
 ON_WM_SYSCOMMAND() y<.1+TG  
 ON_WM_PAINT() Rl-Sr  
 ON_WM_QUERYDRAGICON() qifX7AXHr  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) JZN'U<R  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) a B%DIH,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) V[A uw3)  
//}}AFX_MSG_MAP t&0pE(MO/  
END_MESSAGE_MAP() nIKh<ws4z  
F}.<x5I-;h  
BOOL CCaptureDlg::OnInitDialog() De\&r~bTW9  
{ G' Jsk4:c  
 CDialog::OnInitDialog(); PJS\> N&u  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9>\s81^  
 ASSERT(IDM_ABOUTBOX < 0xF000); (*BQd1Z  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }M * Oo  
 if (pSysMenu != NULL) -AJe\ J 2  
 { j:\MrYt0H  
  CString strAboutMenu; eDgRYa9\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); "\)j=MI8u+  
  if (!strAboutMenu.IsEmpty()) LZ}C{M{=5A  
  { 4tof[n3us  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5fA<I _ D  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); uI!rJc>TX  
  } b_:]Y<{> f  
 } |fOQm  
 SetIcon(m_hIcon, TRUE); // Set big icon >@rsh-Z  
 SetIcon(m_hIcon, FALSE); // Set small icon ^[uA^  
 m_Key.SetCurSel(0); u4, p.mZtb  
 RegisterHotkey(); 7q^o sOj"  
 CMenu* pMenu=GetSystemMenu(FALSE); ?ep93:j  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); n0:'h}^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); B{PI&a9~s%  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ,dLh`t<\  
 return TRUE; // return TRUE unless you set the focus to a control  bF0 y`  
} I>B-[QEC  
P=OHiG\z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) d @<(Z7|  
{ #qtAFIm'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) $0~H~ -  
 { K?8{ y  
  CAboutDlg dlgAbout; {m.l{<H  
  dlgAbout.DoModal(); NiQ`,Q$B  
 } ~k'KS 7c  
 else & gnE"  
 { `lX |yy"  
  CDialog::OnSysCommand(nID, lParam); XXBN Nr_CK  
 } Y!N *J  
} 4Z12Z@A#7  
y0k*iS e  
void CCaptureDlg::OnPaint() ,]+P#eXgE  
{ k7z;^:  
 if (IsIconic()) mEyJ o|  
 { _~ZNX+4  
  CPaintDC dc(this); // device context for painting s<Px au+A  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); G1=GzAd$5  
  // Center icon in client rectangle "l&=a1l  
  int cxIcon = GetSystemMetrics(SM_CXICON); {4SwCN /  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?mU 3foa  
  CRect rect; sEP-jEuwG  
  GetClientRect(&rect); EnnT)qos  
  int x = (rect.Width() - cxIcon + 1) / 2; jT}3Zn  
  int y = (rect.Height() - cyIcon + 1) / 2; SAMP,un7  
  // Draw the icon >qk[/\^O  
  dc.DrawIcon(x, y, m_hIcon); 0*^ J;QGE  
 } (99P9\[p  
 else EhL 8rR  
 { `?r]OVe{y  
  CDialog::OnPaint(); ()a(PvEO  
 } g`I`q3EF)  
} `@1y|j:m  
&'4{/Gz  
HCURSOR CCaptureDlg::OnQueryDragIcon() 91d@/z  
{ =oQw?,eY  
 return (HCURSOR) m_hIcon; ky>0  
} ChO?Lm$y  
ilJeI@  
void CCaptureDlg::OnCancel() ?@8[1$1a  
{ zea=vx>`  
 if(bTray) 5mxHOtvtWM  
  DeleteIcon(); b~dm+5W7  
  CDialog::OnCancel(); 6$c,#%Jt*  
} _yk} [x0>  
NsDJ q{  
void CCaptureDlg::OnAbout() Elth xj  
{ 65X31vU  
 CAboutDlg dlg; ?|!167/O  
 dlg.DoModal(); Q M7z .  
} 1&N|k;#QS  
2c:H0O 0o  
void CCaptureDlg::OnBrowse() NJK?5{H'  
{ mw0#Dhyy1=  
 CString str; $Gt1T[:QUX  
 BROWSEINFO bi; BMPLL2I  
 char name[MAX_PATH]; [GKSQt{)  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 7 +A-S9P)  
 bi.hwndOwner=GetSafeHwnd(); w20E]4"  
 bi.pszDisplayName=name; $jMU| {  
 bi.lpszTitle="Select folder"; kB_uU !G  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; xHEkmL`)4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); t95hI DtD  
 if(idl==NULL) " a;z  
  return; L-ans2?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); nsR^TD;  
 str.ReleaseBuffer(); X&qRanOP;z  
 m_Path=str; cy)b/4h@  
 if(str.GetAt(str.GetLength()-1)!='\\') LL3RC6;e  
  m_Path+="\\";  /;LteBoY  
 UpdateData(FALSE); ;-84cpfu  
} %4QCUc*lr  
!R,9Pg*Ey  
void CCaptureDlg::SaveBmp() V+M2Gf  
{ AU1P?lk  
 CDC dc; Y ON@G5^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); E.W7`zl  
 CBitmap bm; x h[4d  
 int Width=GetSystemMetrics(SM_CXSCREEN); .UNh\R?r  
 int Height=GetSystemMetrics(SM_CYSCREEN); T=7V+  
 bm.CreateCompatibleBitmap(&dc,Width,Height); xo{f"8}^  
 CDC tdc; EFeGxM  
 tdc.CreateCompatibleDC(&dc); w7\:S>;(O"  
 CBitmap*pOld=tdc.SelectObject(&bm); TnET1$@qr*  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); rN#ydw:9  
 tdc.SelectObject(pOld);  I 0ycLx  
 BITMAP btm; t!^FWr&  
 bm.GetBitmap(&btm); U|odm58s  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; aM'0O![d  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (zkh`8L  
 BITMAPINFOHEADER bih; =DTn9}u  
 bih.biBitCount=btm.bmBitsPixel; QC>I<j& `!  
 bih.biClrImportant=0; F=   
 bih.biClrUsed=0; &*g5kh{  
 bih.biCompression=0; J)(H-xvV  
 bih.biHeight=btm.bmHeight; R =HN>(U  
 bih.biPlanes=1; /:dVW" A|  
 bih.biSize=sizeof(BITMAPINFOHEADER); W.p->,N  
 bih.biSizeImage=size; Lc^nNUzPo  
 bih.biWidth=btm.bmWidth; "hz(A.THi  
 bih.biXPelsPerMeter=0; A`u04Lm7  
 bih.biYPelsPerMeter=0; E*Vx^k$  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); SqY;2:  
 static int filecount=0; "d'xT/l "  
 CString name; P,AS`=z  
 name.Format("pict%04d.bmp",filecount++); C|"T!1MlY4  
 name=m_Path+name; q ,d]i/T  
 BITMAPFILEHEADER bfh; )<4o"R:*  
 bfh.bfReserved1=bfh.bfReserved2=0; Faa:h#  
 bfh.bfType=((WORD)('M'<< 8)|'B'); hXS'*vO"  
 bfh.bfSize=54+size; Q3%a=ba)h  
 bfh.bfOffBits=54; dv4)fG]W;_  
 CFile bf; O89<IXk  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 7=om /  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); u]E%R&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 6N.mSnp  
  bf.WriteHuge(lpData,size); U._ U!U  
  bf.Close(); ]Vjn7P`~ N  
  nCount++; &.kg8|s{  
 } vJ GxD\h  
 GlobalFreePtr(lpData);  9 N=KU  
 if(nCount==1) wO} 3i6  
  m_Number.Format("%d picture captured.",nCount); %H<w.]>  
 else psRm*,*O  
  m_Number.Format("%d pictures captured.",nCount); < Q\`2{  
  UpdateData(FALSE); UkNC|#l)  
} l@1f L%f  
hv*n";V   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) vo Q,K9  
{ WbH/K]/1)h  
 if(pMsg -> message == WM_KEYDOWN) r_)-NOp  
 { cdU2ph_  
  if(pMsg -> wParam == VK_ESCAPE) |BH, H  
   return TRUE; C==tJog[  
  if(pMsg -> wParam == VK_RETURN) \07Vh6cj  
   return TRUE; ieBW 0eMi  
 } K 1:F{*  
 return CDialog::PreTranslateMessage(pMsg); &[*<>  
} 3=bzIU  
u.hnQsM  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ie.cTTOI  
{ r@%32h  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5tq$SF42X  
  SaveBmp(); =Bo0Oei  
  return FALSE; <S$y=>.9  
} [&3"kb  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Cc Ni8Wg_  
 CMenu pop; ^"buF\3L  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /4~RlXf@  
 CMenu*pMenu=pop.GetSubMenu(0); Tg:NeAN7(  
 pMenu->SetDefaultItem(ID_EXITICON); 2~J|x+  
 CPoint pt; &u=FLp5  
 GetCursorPos(&pt); ;prp6(c  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); bjT0Fi0-  
 if(id==ID_EXITICON) (/*-M]>  
  DeleteIcon(); gu:..'V  
 else if(id==ID_EXIT) z%g<&Cq  
  OnCancel(); fs)O7x-B(  
 return FALSE; yp*kMC,3  
} $^ >n@Q@&L  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,JZ@qmQ,  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0e7v ?UT  
 AddIcon(); sg6cq_\  
 return res; ,MvvW{EY  
} pwZ &2&|  
Q  o=  
void CCaptureDlg::AddIcon() O0$ijJa|  
{ P2s0H+<  
 NOTIFYICONDATA data; wK\SeX  
 data.cbSize=sizeof(NOTIFYICONDATA); *@BBlkcx  
 CString tip; iTK1I0  
 tip.LoadString(IDS_ICONTIP); 1gm{.*G  
 data.hIcon=GetIcon(0); A23Z)`  
 data.hWnd=GetSafeHwnd(); Ys3C'Gc  
 strcpy(data.szTip,tip); n&V(c&C  
 data.uCallbackMessage=IDM_SHELL; [R:O'AP}@}  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; zYs? w=  
 data.uID=98; Sqge5v  
 Shell_NotifyIcon(NIM_ADD,&data); 1)Ag|4  
 ShowWindow(SW_HIDE); {MEU|9@ Y  
 bTray=TRUE; 6R,;c7Izhd  
}  OB^  
=VSieh  
void CCaptureDlg::DeleteIcon() "yz@LV1  
{ mcR!P~"i  
 NOTIFYICONDATA data; Ud9\;Qse  
 data.cbSize=sizeof(NOTIFYICONDATA); dW5z0VuB$/  
 data.hWnd=GetSafeHwnd(); J *B`C^i  
 data.uID=98; G^OSXf5  
 Shell_NotifyIcon(NIM_DELETE,&data); u4nXK <KL|  
 ShowWindow(SW_SHOW); D"WkD j"M  
 SetForegroundWindow(); tw(2V$J  
 ShowWindow(SW_SHOWNORMAL); j>:T)zhyY  
 bTray=FALSE; u,]yd*  
} wb?hfe  
EtcamI*`  
void CCaptureDlg::OnChange() rTJWftH!  
{ +Q9HsfX/  
 RegisterHotkey(); Eg:p_F*lr  
} 3_>1j  
S`^W#,rj  
BOOL CCaptureDlg::RegisterHotkey() LH8?0 N[  
{ pJ(l=a  
 UpdateData(); JQCwI`%i  
 UCHAR mask=0; RAxz+1JT  
 UCHAR key=0; (l,o UBRr  
 if(m_bControl) 1W8W/Y=hT  
  mask|=4; 7lpVK]  
 if(m_bAlt) n" ~*9'  
  mask|=2; Y>%NuL|s  
 if(m_bShift) ^/uGcz|.  
  mask|=1; ;n@C(hG  
  key=Key_Table[m_Key.GetCurSel()]; >tzXbmFp;  
 if(bRegistered){ _7<U[63  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); n\YxRs7 hF  
  bRegistered=FALSE; 1L|(:m+  
 } ..:V3]-D  
 cMask=mask; rifxr4c[X>  
 cKey=key; Gpu?z- )  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #.)>geLC>9  
 return bRegistered; l1[IXw?  
} THp `!l  
a*hThr+$M  
  四、小结 bij?q\  
,Ai i>D]  
  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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