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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: TS=U%)Ik  
  \i<7Lk  
  一、实现方法 E #!.;AQ  
\vS > jB  
  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: 2|NQ5OA0  
K=pG,[ChA  
#pragma data_seg("shareddata") ]a[2QQ+g  
HHOOK hHook =NULL; //钩子句柄 Ua~8DdW  
UINT nHookCount =0; //挂接的程序数目 9eR";Wm])  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 g?cxqC<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 k3]qpWKj  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey )d|s$l$?7  
static int KeyCount =0; kX)*:~*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 8~BLTZ  
#pragma data_seg() !:}m-iqQ1  
IfY?P(P  
  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。 0}'/3Q  
Zt9ld=T  
  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: 4i<GqG  
xP27j_*m>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR !HeQMz  
cKey,UCHAR cMask) SEE:v+3|  
{ i 8%@4U/ J  
 BOOL bAdded=FALSE; u('`.dwkc  
 for(int index=0;index<MAX_KEY;index++){ |C0!mU  
  if(hCallWnd[index]==0){ X}ihYM3y/  
   hCallWnd[index]=hWnd; *Y!RU{w+Z  
   HotKey[index]=cKey; @CoUFdbz  
   HotKeyMask[index]=cMask; {CFy %  
   bAdded=TRUE; X0]$Ovq(l  
   KeyCount++; 1{1mL-I;  
   break; *_H]?&  
  } !\'HKk~V  
 } Tl+PRR6D*  
 return bAdded; %MCS_'N J  
} vN~joQ=d  
//删除热键 43~v1pf{!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) AOz~@i^  
{ V6kDyl(  
 BOOL bRemoved=FALSE; J*AYZS-tSE  
 for(int index=0;index<MAX_KEY;index++){ kxmsrQ>av  
  if(hCallWnd[index]==hWnd){ 8A u W>7_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ h${=gSJc  
    hCallWnd[index]=NULL; g[\8s~g,  
    HotKey[index]=0; }FX:sa?5  
    HotKeyMask[index]=0; 1@F>E;YjL=  
    bRemoved=TRUE; ,vBB". LY'  
    KeyCount--; VJ1rU mO~  
    break; WmRu3O  
   } l%qh^0  
  } o>&-B.zq  
 } 5v sn'=yN  
 return bRemoved; Cm0K-~ U  
} 6y"T;.FAo  
m\_v{1g  
ME.!l6lm\  
  DLL中的钩子函数如下: g!z &lQnZ  
E 0@u|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E `V?Io  
{ *Xn6yL9  
 BOOL bProcessed=FALSE; $yUPua/-  
 if(HC_ACTION==nCode) O:8Ne*L`D  
 { 1bjWWNzQA  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ):n'B` f}z  
   switch(wParam) #IJ6pg>K  
   {  L D%SLJ:  
    case VK_MENU: .\3gb6S}  
     MaskBits&=~ALTBIT; ~3|)[R=+p1  
     break; 6LqF*$+$`  
    case VK_CONTROL: :W+%jn  
     MaskBits&=~CTRLBIT; JM53sx4&  
     break; Kp!A ay  
    case VK_SHIFT: D}N4*L1  
     MaskBits&=~SHIFTBIT; j9BcoEl:;  
     break; j@4]0o  
    default: //judge the key and send message Sae*VvT6  
     break; j{/5i`5m  
   } <X?xr f  
   for(int index=0;index<MAX_KEY;index++){ <<-BQ l~  
    if(hCallWnd[index]==NULL) n- 1  
     continue; y!|4]/G]?t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t7*F,  
    { g'EPdE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .Y }k@T40a  
     bProcessed=TRUE; F3x*dq2  
    } *9`k$'  
   } uX6rCokr  
  } -oY8]HrXfK  
  else if((lParam&0xc000ffff)==1){ //有键按下 kZfj"+p_S  
   switch(wParam) V5 Gy|X  
   { a;&0u>  
    case VK_MENU: +KOhDtLMG  
     MaskBits|=ALTBIT; 3.rl^Cq1  
     break; g3Ul'QJ  
    case VK_CONTROL: %2^V.`0T  
     MaskBits|=CTRLBIT; {yMkd4v  
     break; Z}3;Ych  
    case VK_SHIFT: V=Z%y$1Bc  
     MaskBits|=SHIFTBIT; ly@%1  
     break; Z`n "}{  
    default: //judge the key and send message ojVN -*5  
     break; >}d6)s|   
   } Vq^b_^  
   for(int index=0;index<MAX_KEY;index++){  vF'IK,  
    if(hCallWnd[index]==NULL) %Siw>  
     continue; V3/OKI\o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \\Z?v,XsS  
    { V h5\'Sn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4%6@MQ[  
     bProcessed=TRUE; dE 3M   
    } .fK~IKA  
   } #.LI `nYA  
  } drp< f1`l8  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  p.,`3"C1  
   for(int index=0;index<MAX_KEY;index++){ ~b[5}_L=>  
    if(hCallWnd[index]==NULL) MI`<U:-lP  
     continue; H8E#r*"-m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) m5W':vM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); WGUd@lC~  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 wid  
   } }G"bD8+  
  } R,-DP/ (im  
 } cxIAI=JK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "a<:fEsSE  
} [9y y<Z5  
M0]J `fL@  
  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: CH6;jo]  
w4RtIDW:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (62Sc]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .RbPO#(  
1WI^R lWd(  
  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: r6nWrO>y  
C`8.8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $wk(4W8E  
{ ) gxN' z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ! z5Ozm+}  
 { B!J&=*=e  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Jn20^YG  
  SaveBmp(); /^`d o3a}  
  return FALSE; P+rDln {  
 } 4v`;D,dIu  
 …… //其它处理及默认处理 WKq{g+a  
} gi8f)MNP?~  
:T#f&|Gg;  
Qn@[{%),4  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 d;).| .}P  
qh6Q#s>tH  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 "[CR5q9Pr  
U bh)}G,Mg  
  二、编程步骤 \CYKj_c  
xBE}/F$ 45  
  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"; L(HAAqRnJ  
'.7ER  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,fhK  
f~f)6XU|  
  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; ]'0}fuV  
w%%*3[--X  
  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; u_Xp\RJ  
zTw<9Nf  
  5、 添加代码,编译运行程序。 h<g2aL21?F  
"?'9\<>  
三、程序代码 f/sLQdK,  
+rka 5ts  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (b7',:_U7  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) a@C}0IP)  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ v `;Hd8  
#if _MSC_VER > 1000 Dp?lgw  
#pragma once R'^J#"[  
#endif // _MSC_VER > 1000 </2Cn@  
#ifndef __AFXWIN_H__ :bq UA(k  
#error include 'stdafx.h' before including this file for PCH 4UMOC_  
#endif XM`&/)  
#include "resource.h" // main symbols l(8@?t^;  
class CHookApp : public CWinApp {3``B#}  
{ K#R|GEwr  
 public: }|],UXk{xB  
  CHookApp(); FMT_X  
  // Overrides {v2[x W  
  // ClassWizard generated virtual function overrides Z5@E|O&  
  //{{AFX_VIRTUAL(CHookApp) Q3[nS(#Z/=  
 public: B_"PFWwg  
  virtual BOOL InitInstance(); RAA,%rRhu(  
  virtual int ExitInstance(); lr)9U 7  
  //}}AFX_VIRTUAL |W5lhx0U  
  //{{AFX_MSG(CHookApp) x.'Ys1M  
  // NOTE - the ClassWizard will add and remove member functions here. 5a:YzQ4  
  // DO NOT EDIT what you see in these blocks of generated code ! O ]t)`+%q  
  //}}AFX_MSG -=qHwcId  
  DECLARE_MESSAGE_MAP() }-p-(  
}; LRSt >; M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); N({-&A.N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /mK]O7O7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {]O.?Yru?  
BOOL InitHotkey(); fjm 3X$tR  
BOOL UnInit(); 8o466m6/  
#endif [=>[2Ty  
r>t|.=!  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ;33SUgX  
#include "stdafx.h" I:YE6${k!  
#include "hook.h" S~^]ib0  
#include <windowsx.h> SfPtG  
#ifdef _DEBUG wif1|!aL  
#define new DEBUG_NEW H:mcex  
#undef THIS_FILE 5qkyi]/U8  
static char THIS_FILE[] = __FILE__;  y)3OQ24  
#endif ,W>-MPJn[8  
#define MAX_KEY 100 $I9U.~*  
#define CTRLBIT 0x04 xN6}4JB  
#define ALTBIT 0x02 4Td)1~zc3  
#define SHIFTBIT 0x01 ~31-)*tJ]  
#pragma data_seg("shareddata") /`7G7pQ+  
HHOOK hHook =NULL; G#6O'G N  
UINT nHookCount =0; X&A2:A 6\+  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey j+2-Xy'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &0OH:P%  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey a,e;(/#\7  
static int KeyCount =0; hfs QAa  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift /1.gv~`+  
#pragma data_seg() ^CB@4$!   
HINSTANCE hins; 7Kt i&T  
void VerifyWindow(); x6Q_+!mnk  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !ozHS_  
//{{AFX_MSG_MAP(CHookApp) 0&c<1;  
// NOTE - the ClassWizard will add and remove mapping macros here. $LtCI  
// DO NOT EDIT what you see in these blocks of generated code! rWJKK  
//}}AFX_MSG_MAP iGNZC{  
END_MESSAGE_MAP() I<S*"[nV  
8*eVP*g  
CHookApp::CHookApp() 'i 8`LPQ  
{ _SQ]\Z  
 // TODO: add construction code here, pK)!o  
 // Place all significant initialization in InitInstance S~GS:E#  
} ;s5JYR  
_w7yfZLv+  
CHookApp theApp; N'?#g`*KW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) i$H9~tPs  
{ `(~oZbErM  
 BOOL bProcessed=FALSE; S*H @`Do%d  
 if(HC_ACTION==nCode) 3*eS<n[uG  
 { >vNE3S_  
  if((lParam&0xc0000000)==0xc0000000){// Key up ty8E;[ '  
   switch(wParam) 2=X.$&a  
   { ilQt`-O!  
    case VK_MENU: e)|5 P  
     MaskBits&=~ALTBIT; HcHwvf6y  
     break; VRUA<x  
    case VK_CONTROL: D`)K3;h  
     MaskBits&=~CTRLBIT; Oo9'  
     break; ,6x>gcR  
    case VK_SHIFT: 2QKt.a  
     MaskBits&=~SHIFTBIT; {G{ >Qa|  
     break; v R ! y#  
    default: //judge the key and send message KuMH,rXF  
     break; |^gnT`+  
   } iO}KERfU  
   for(int index=0;index<MAX_KEY;index++){ I\|.WrMNi  
    if(hCallWnd[index]==NULL) mH )i  
     continue; Zl?9ibm;@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Uf~5Fc1d =  
    { 18> v\Hi<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2 e&M/{  
     bProcessed=TRUE; JG{`tTu  
    } BVS SO's  
   } fRp(&%8E  
  }  Rp6q)  
  else if((lParam&0xc000ffff)==1){ //Key down 2j$~lI  
   switch(wParam) 2h1P!4W85  
   { 5X:3'*  
    case VK_MENU: 4TSkm`iR  
     MaskBits|=ALTBIT; TpxAp',#7  
     break; 1tlqw  
    case VK_CONTROL: ?3<Y/Vg%c  
     MaskBits|=CTRLBIT; </W"e!?X  
     break; 40 zO4  
    case VK_SHIFT: ts r{-4V  
     MaskBits|=SHIFTBIT; Wlp`D  
     break; xsU3c0wbr8  
    default: //judge the key and send message ~w}=Oby'y  
     break; CW+gZ!  
   } $dug"[  
   for(int index=0;index<MAX_KEY;index++) chM-YuN|  
   { :N'   
    if(hCallWnd[index]==NULL) 9fsc>9  
     continue; !p_l(@f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n%!50E6*:  
    { =>7czw:S 1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X7?j90tH  
     bProcessed=TRUE; k7M{+X6[  
    } >L$9fn/J  
   } #z}0]GJKj  
  } kH=qJ3Z  
  if(!bProcessed){ [~?6jnp  
   for(int index=0;index<MAX_KEY;index++){ jH<,dG:{  
    if(hCallWnd[index]==NULL) rY)m"'puP  
     continue; m; PTO$--  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5Hs !s+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); v+CW([zAx#  
   } &?k`rF9  
  } -o57"r^x  
 } wd1>L) T  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  nWUau:%  
} \!k\%j 9  
4thPR}DH}  
BOOL InitHotkey() tR_DN  
{ !k#N] 9D3  
 if(hHook!=NULL){ <f0yh"?6VH  
  nHookCount++; ,,-j5Y  
  return TRUE; E cd~H+  
 } A$?o3--#]G  
 else zoj w^%W  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 'Y/8gD~.  
  if(hHook!=NULL) ~}Z{hs)  
   nHookCount++; H-8_&E?6m  
  return (hHook!=NULL); '@"A{mrE  
} 8_3WCbe/  
BOOL UnInit() Hq,znRz~`  
{ }RQ'aeVl(  
 if(nHookCount>1){  0 - u,AD  
  nHookCount--; jjg&C9w T  
  return TRUE; .iST!nh  
 } zhU^~4F  
 BOOL unhooked = UnhookWindowsHookEx(hHook); XOEf,"  
 if(unhooked==TRUE){ O\w-hk  
  nHookCount=0; ictOC F  
  hHook=NULL; cN)noGkp  
 } 8,:lw3x1  
 return unhooked; &pAmFe  
} )(yKm/5 0  
Q|Nw @7$`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b+$-f:mj  
{ YwJ<0;:+hS  
 BOOL bAdded=FALSE; +^a@U^V  
 for(int index=0;index<MAX_KEY;index++){ ^k!u  
  if(hCallWnd[index]==0){ o|V=3y Ok  
   hCallWnd[index]=hWnd; :Y)G-:S+  
   HotKey[index]=cKey; lsVg'k/Z!  
   HotKeyMask[index]=cMask; mm N $\2  
   bAdded=TRUE; O! w&3 p  
   KeyCount++; [8[`V)b  
   break; p0HcuB)Y  
  } ;5}"2hU>  
 } ;AT~?o`n  
 return bAdded; mMad1qCi7  
} S?Uvt?  
XMpE|M! c  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @T{I;8S  
{ B|rf[EI>  
 BOOL bRemoved=FALSE; 9bD ER  
 for(int index=0;index<MAX_KEY;index++){ N'8}5Kx5  
  if(hCallWnd[index]==hWnd){ Y IVN;:B.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =7zvp,B  
    hCallWnd[index]=NULL; _i0,?U2C  
    HotKey[index]=0; z4(Q.0x7  
    HotKeyMask[index]=0; Yk5Cyq  
    bRemoved=TRUE; - [7S.  
    KeyCount--; @34CaZ$k  
    break; M\=/i\-  
   } S&~;l/  
  } y?V#LW[^E  
 } wU5= '  
 return bRemoved; 2tdr1+U?g  
} }_cX" s  
efm#:>H  
void VerifyWindow() .4,l0Nn`W  
{ vv`,H~M6  
 for(int i=0;i<MAX_KEY;i++){ *iujJ i  
  if(hCallWnd!=NULL){ 9'h4QF+Y  
   if(!IsWindow(hCallWnd)){ oz\r0:  
    hCallWnd=NULL;  .KE2sodq  
    HotKey=0; gz`P~7-w:  
    HotKeyMask=0; )cxML<j'  
    KeyCount--; mV'^4by  
   } {@3p^b*E)1  
  } 7f q\ H{  
 } +FtL_7[v  
} Xq.G vZS`  
;O * o  
BOOL CHookApp::InitInstance() -'::$ {  
{ t+ O7dZt%r  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); T~-PT39E  
 hins=AfxGetInstanceHandle(); #6qLu  
 InitHotkey(); kG]FB.@bG  
 return CWinApp::InitInstance(); /mFa*~dj2  
} 4Awl  
p+|(lrYC  
int CHookApp::ExitInstance() t[?O*>  
{ FR1se  
 VerifyWindow(); }TAHVcX*p  
 UnInit(); he1W22  
 return CWinApp::ExitInstance(); h**mAa0fo  
} "r.eN_d  
RF.8zea{O`  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file tz"zQC$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Xu#K<#V  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !JVpR]lWS  
#if _MSC_VER > 1000 <MoKTP-<  
#pragma once 0`l(c  
#endif // _MSC_VER > 1000 z2.ZxL"*  
5qx$=6PT  
class CCaptureDlg : public CDialog NKS-G2 Y<P  
{ U `<?~Bz  
 // Construction !aub@wH3  
 public: k->cqtG  
  BOOL bTray; A/{0J\pA  
  BOOL bRegistered; e4?p(F-x(  
  BOOL RegisterHotkey(); |qTS{qQh{L  
  UCHAR cKey; Rt10:9Kz$  
  UCHAR cMask; -R-|[xN  
  void DeleteIcon(); 8rA?X*|S!  
  void AddIcon(); 6t(I.>-  
  UINT nCount; 0"to]=  
  void SaveBmp(); |=9=a@l]P  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor -v7O*xm"  
  // Dialog Data SH${\BKup  
  //{{AFX_DATA(CCaptureDlg) ~}fQ.F*7R  
  enum { IDD = IDD_CAPTURE_DIALOG }; !K$qh{n  
  CComboBox m_Key; ' ;PHuMY#X  
  BOOL m_bControl; Lu@'Ee!>G  
  BOOL m_bAlt; QirS=H+~  
  BOOL m_bShift; ^E3i]Oem  
  CString m_Path; +P?^Yx0d  
  CString m_Number; >^fkHbgNQ  
  //}}AFX_DATA j >wT-s  
  // ClassWizard generated virtual function overrides pNzSy"Y$  
  //{{AFX_VIRTUAL(CCaptureDlg) L)Iv] u  
 public: Y$SwQ;wl  
  virtual BOOL PreTranslateMessage(MSG* pMsg); .}.63T$h9  
 protected: m|5yET  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support T8ftBIOi  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }.j09[<  
  //}}AFX_VIRTUAL _PR> <L_  
  // Implementation 09psqXU@I  
 protected: 7u9!:}Tu  
  HICON m_hIcon; j>70AE3[8  
  // Generated message map functions dLs40 -R  
  //{{AFX_MSG(CCaptureDlg) CI };$4W~  
  virtual BOOL OnInitDialog(); J^R#  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5#SD$^  
  afx_msg void OnPaint(); c5t],P  
  afx_msg HCURSOR OnQueryDragIcon(); s}pn5zMp:8  
  virtual void OnCancel(); 6fOh *  
  afx_msg void OnAbout(); )K0BH q7r  
  afx_msg void OnBrowse(); UvtSNP&/2d  
  afx_msg void OnChange(); rz @;Zn  
 //}}AFX_MSG [e:mRMi  
 DECLARE_MESSAGE_MAP() `f9I#B  
}; zu~E}  
#endif x3JX}yCX  
y~cDWD <h  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file   vZQ'  
#include "stdafx.h" h* to%N  
#include "Capture.h" ~HH#aXh*  
#include "CaptureDlg.h" ;be2sTo  
#include <windowsx.h> wlM"Zt  
#pragma comment(lib,"hook.lib") QQ5G?E  
#ifdef _DEBUG JY|f zL  
#define new DEBUG_NEW CqRG !J  
#undef THIS_FILE ,c%>M^d  
static char THIS_FILE[] = __FILE__; BihXYux*  
#endif BmRk|b  
#define IDM_SHELL WM_USER+1 )@ /!B`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XkWO-L  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u H}cvshv  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )rTV}Hk  
class CAboutDlg : public CDialog c:/ H}2/C  
{ 8}& O7zO?  
 public: b|cUKsL5  
  CAboutDlg(); (qDu|S3P  
  // Dialog Data .."=  
  //{{AFX_DATA(CAboutDlg) F0O/SI(cA  
  enum { IDD = IDD_ABOUTBOX }; tntQO!pM  
  //}}AFX_DATA yX}riXe  
  // ClassWizard generated virtual function overrides 36<PI'l#~  
  //{{AFX_VIRTUAL(CAboutDlg) !z !R)6  
 protected: 0$-N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *20$u% z2  
  //}}AFX_VIRTUAL Xgge_`T9  
  // Implementation 'nOc_b0  
 protected: .kl _F7  
  //{{AFX_MSG(CAboutDlg) >i>%@  
  //}}AFX_MSG Ut;, Z  
  DECLARE_MESSAGE_MAP() )F\tU  
}; NArql  
?h;Zdv>`xz  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t,mD{ENm&  
{ fh0a "#L{  
 //{{AFX_DATA_INIT(CAboutDlg) ZgN )sVJ  
 //}}AFX_DATA_INIT U*.Wx0QM  
} zFy0Sz F  
o1j_5c PS  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #S57SD  
{ V^a] @GK:  
 CDialog::DoDataExchange(pDX); W0]W[b,:u$  
 //{{AFX_DATA_MAP(CAboutDlg) 35dbDgVz$  
 //}}AFX_DATA_MAP oT5 N_\  
} ^f:oKKaAW;  
Voi`OCut  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) R5iv]8X4W  
 //{{AFX_MSG_MAP(CAboutDlg) UZ8 vZ  
 // No message handlers %#!pAUP\&  
 //}}AFX_MSG_MAP `Zn2Vx  
END_MESSAGE_MAP() RcQo1  
ZeVb< g  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) wYxnKm~f  
: CDialog(CCaptureDlg::IDD, pParent) h,:8TMJRRN  
{ wB(A['k  
 //{{AFX_DATA_INIT(CCaptureDlg) >Ux5UD  
  m_bControl = FALSE; $O}:*.{(W  
  m_bAlt = FALSE; W0vdU;?%  
  m_bShift = FALSE; eGZ{%\PH<  
  m_Path = _T("c:\\"); u`Ew^-">  
  m_Number = _T("0 picture captured."); p&Usl.  
  nCount=0; <S*o}:iB  
  bRegistered=FALSE; i qCZIahf  
  bTray=FALSE; obUX7N  
 //}}AFX_DATA_INIT 3*13XQ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 wYTF:Ou^5~  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); p=T,JAIt  
} _x<CTFTL  
/ESmQc:DWB  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) tvH{[e$  
{ &yFt@g]  
 CDialog::DoDataExchange(pDX); Iu`B7UOF  
 //{{AFX_DATA_MAP(CCaptureDlg) !C&!Wj  
  DDX_Control(pDX, IDC_KEY, m_Key); /aa'ryl_%  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); L&td4`2y  
  DDX_Check(pDX, IDC_ALT, m_bAlt); R8 1z|+c|_  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); n GE3O#fv  
  DDX_Text(pDX, IDC_PATH, m_Path); ZU%7m_zO  
  DDX_Text(pDX, IDC_NUMBER, m_Number); $i@~$m7d-  
 //}}AFX_DATA_MAP <<>?`7N  
} 9;3f`DK@2k  
[eV!ho*r  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .VF4?~+M-  
//{{AFX_MSG_MAP(CCaptureDlg) Rg! [ic !  
 ON_WM_SYSCOMMAND() ]kC/b^~+m  
 ON_WM_PAINT() yw'b^D/  
 ON_WM_QUERYDRAGICON() Yn ZV.&4{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) R3;GMe@D#  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) = E'\  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Bor_Kib  
//}}AFX_MSG_MAP "7_6iB&@<  
END_MESSAGE_MAP() {Z<4  
]wLHe2bE u  
BOOL CCaptureDlg::OnInitDialog() Yrp WGK520  
{ w]w>yD>$  
 CDialog::OnInitDialog(); =8`,,=P^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ^` N+mlh  
 ASSERT(IDM_ABOUTBOX < 0xF000); 9kj71Jp&}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;c"T#CH.  
 if (pSysMenu != NULL) o$I% 1  
 { aML?$_6  
  CString strAboutMenu;  ajF-T=5  
  strAboutMenu.LoadString(IDS_ABOUTBOX); il=y m  
  if (!strAboutMenu.IsEmpty()) X&sXss<fO%  
  { @ ]u nqCO  
   pSysMenu->AppendMenu(MF_SEPARATOR); hR" j[  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Jvt| q5  
  } Q/rOIHiI  
 } H)S&sx#q]  
 SetIcon(m_hIcon, TRUE); // Set big icon Y9fktg.  
 SetIcon(m_hIcon, FALSE); // Set small icon 0,*clvH\;  
 m_Key.SetCurSel(0); ] fz0E:x  
 RegisterHotkey(); Vrl)[st!;I  
 CMenu* pMenu=GetSystemMenu(FALSE); fNOsB^Y  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Z_{`$nW  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +grIw# j  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); iLf:an*vH  
 return TRUE; // return TRUE unless you set the focus to a control '3B`4W,  
} &!uw;|%  
x]|8  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ZGrjb22M  
{ ^LgaMmz  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) g#0h{%3A \  
 { VF1)dd  
  CAboutDlg dlgAbout; N=hr%{} c  
  dlgAbout.DoModal(); %/!n]g-  
 } Q*|O9vu'D  
 else (CKx s I@  
 { $!P(Q  
  CDialog::OnSysCommand(nID, lParam); 9 ! [oJ3  
 } gAt[kW< n  
} O<nJbsl_w  
MJ^NRT0?b  
void CCaptureDlg::OnPaint() $P#Cf&R  
{ idiJ|2T"G  
 if (IsIconic()) -'& 4No  
 { vaQZ1a,  
  CPaintDC dc(this); // device context for painting n|`L>@aw,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @ @$=MSN  
  // Center icon in client rectangle JJJlgr]#  
  int cxIcon = GetSystemMetrics(SM_CXICON); ]eA<  
  int cyIcon = GetSystemMetrics(SM_CYICON); NQS@i'W=g  
  CRect rect; seWYY $$  
  GetClientRect(&rect); Am3^3>  
  int x = (rect.Width() - cxIcon + 1) / 2; DArEIt6Q  
  int y = (rect.Height() - cyIcon + 1) / 2; |0:&d w?*!  
  // Draw the icon Sqj'2<~W  
  dc.DrawIcon(x, y, m_hIcon); pjr,X+6o  
 } "-JJ6Bk  
 else zA[6rYXY  
 { ]Cy1yAv={  
  CDialog::OnPaint(); #iD5& klo\  
 } F*QZVg+<*X  
} "orZje9AC  
{'dpRq{c|  
HCURSOR CCaptureDlg::OnQueryDragIcon() !FOPFPn  
{ 9Mo(3M  
 return (HCURSOR) m_hIcon; lO},fM2j  
} %v=z|d5-3  
Th,15H DA  
void CCaptureDlg::OnCancel() U085qKyCw  
{ )qs>Z?7  
 if(bTray) h,B ]5Of  
  DeleteIcon(); lVY`^pw?  
  CDialog::OnCancel(); YGrmco?G  
} B:qH7`s  
clK3kBh~&  
void CCaptureDlg::OnAbout() ,^,KWi9  
{ prE~GO7Z  
 CAboutDlg dlg; X8l[B{|  
 dlg.DoModal(); s6SG%Vd  
} }R5>ja0  
$h1`-=\7  
void CCaptureDlg::OnBrowse() F VW&&ft  
{ 7eb^^a?  
 CString str; HN,E+ dQ  
 BROWSEINFO bi; b['Jr% "O  
 char name[MAX_PATH]; JmB7tRM8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); O o9 ePw7  
 bi.hwndOwner=GetSafeHwnd(); i)fAm$8# G  
 bi.pszDisplayName=name; 5Z{i't0CQ  
 bi.lpszTitle="Select folder"; KK" uSC  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; |x*~PXb  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); SSO F\  
 if(idl==NULL) ''P.~~ezr5  
  return; (xw)pR  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); FbB^$ ]*  
 str.ReleaseBuffer(); [#S[= %  
 m_Path=str; EhDKh\OY5  
 if(str.GetAt(str.GetLength()-1)!='\\') _jt>%v4}4  
  m_Path+="\\"; M]&F1<  
 UpdateData(FALSE); rvjPm5[t  
} ^g/    
{xb8H  
void CCaptureDlg::SaveBmp() M:V'vme)+  
{ @R% n &  
 CDC dc; 2(V;OWY(@  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !}7FC>Cx  
 CBitmap bm; tA'O66.  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5tUp[/]pl  
 int Height=GetSystemMetrics(SM_CYSCREEN); #&zNYzI  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  ! K:  
 CDC tdc; O ;,BzA-n  
 tdc.CreateCompatibleDC(&dc); K(P24Z\#  
 CBitmap*pOld=tdc.SelectObject(&bm); le1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); LbX>@2(&  
 tdc.SelectObject(pOld); e7X#C)  
 BITMAP btm;  hUy"XXpr  
 bm.GetBitmap(&btm); B3 fKb#T  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; bHx09F]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);  ~ Dvxe  
 BITMAPINFOHEADER bih; qRk&bF/  
 bih.biBitCount=btm.bmBitsPixel; .}'49=c  
 bih.biClrImportant=0; 1b*Me'  
 bih.biClrUsed=0; dO/iL7K&  
 bih.biCompression=0; z8v]Kt&  
 bih.biHeight=btm.bmHeight; ^2C)Wk$  
 bih.biPlanes=1; 5[<" _  
 bih.biSize=sizeof(BITMAPINFOHEADER); Mrpz(})  
 bih.biSizeImage=size; \@IEqm6  
 bih.biWidth=btm.bmWidth; iZsZSW \  
 bih.biXPelsPerMeter=0; (`C#Tq  
 bih.biYPelsPerMeter=0; G i 1Jl"  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Cq mtO?vne  
 static int filecount=0; 2>%|PQ  
 CString name; 1Pya\To,m  
 name.Format("pict%04d.bmp",filecount++); (9gL  
 name=m_Path+name; RsTz3]`yv  
 BITMAPFILEHEADER bfh; xi5G?r  
 bfh.bfReserved1=bfh.bfReserved2=0; @E Srj[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); er<yB#/;-  
 bfh.bfSize=54+size; \YXzq<7  
 bfh.bfOffBits=54; m/ D ~D~  
 CFile bf; wm1`<r^M.  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1!N|a< #  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); M8_f{|!&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }STTDq4  
  bf.WriteHuge(lpData,size); &6 ymGo  
  bf.Close(); dJvT2s.t[  
  nCount++; rlUo#  
 } rV6&:\  
 GlobalFreePtr(lpData); ^,-2";2Xh  
 if(nCount==1) D\13fjjHlu  
  m_Number.Format("%d picture captured.",nCount); (^_j,4  
 else %5g(|Y]  
  m_Number.Format("%d pictures captured.",nCount); R1sWhB99  
  UpdateData(FALSE); !TNp|U!  
} E;`@S  
_E\Cm  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) P8& BtA  
{ K_SURTys  
 if(pMsg -> message == WM_KEYDOWN) +8xC%eE  
 { %P8*Az&]T  
  if(pMsg -> wParam == VK_ESCAPE) RpmOg  
   return TRUE; RIm8PV;N  
  if(pMsg -> wParam == VK_RETURN) }}?,({T|n  
   return TRUE; 19h@fA[:  
 } +,g3Xqs}X  
 return CDialog::PreTranslateMessage(pMsg); S4ys)!V1V  
} MpNgp )%>  
)44c[Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m%ec=%L9  
{ pie8 3Wy>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ f (Su  
  SaveBmp(); !VDNqW  
  return FALSE; Svicw`uX0  
} 3< 'bi}{  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <u_ vL WS  
 CMenu pop; 6 l,8ev  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); drwD3jx0xv  
 CMenu*pMenu=pop.GetSubMenu(0); Of}dsav   
 pMenu->SetDefaultItem(ID_EXITICON); /R(]hmW  
 CPoint pt; 1IPRI<1U  
 GetCursorPos(&pt); UdOO+Z_K%  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); H`bS::JI-  
 if(id==ID_EXITICON) w}qLI4  
  DeleteIcon(); 14pyHMOR  
 else if(id==ID_EXIT) p![UOI"W  
  OnCancel(); B&+)s5hh  
 return FALSE; 71+ bn  
} }'p"q )  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :Tcvj5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) LrH"d  
 AddIcon(); JHXtKgFX  
 return res; ^)p+)5l   
} *x-@}WY$U  
&_$0lI DQ  
void CCaptureDlg::AddIcon() at+Nd K  
{ 3y%,f|ju  
 NOTIFYICONDATA data; Kw7uUJR  
 data.cbSize=sizeof(NOTIFYICONDATA); AM0CIRX$  
 CString tip; ()Q#@?c~  
 tip.LoadString(IDS_ICONTIP); tc0(G~.N  
 data.hIcon=GetIcon(0); 9e*o$)j_  
 data.hWnd=GetSafeHwnd(); /!'Png0!  
 strcpy(data.szTip,tip); YTD&swk  
 data.uCallbackMessage=IDM_SHELL; z"c,TlVN3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; b]4\$rW7  
 data.uID=98; @u @,Edh  
 Shell_NotifyIcon(NIM_ADD,&data); <{T5}"e  
 ShowWindow(SW_HIDE); Vq599M:)V  
 bTray=TRUE; xOx=Z\ c  
} USg,=YM  
qjsEyro$-  
void CCaptureDlg::DeleteIcon() t"Bp # U1  
{ H0f]Swh0a  
 NOTIFYICONDATA data; 6j Rewj  
 data.cbSize=sizeof(NOTIFYICONDATA); !CdF,pd/)m  
 data.hWnd=GetSafeHwnd(); pr[V*C/  
 data.uID=98; ]$BC f4:  
 Shell_NotifyIcon(NIM_DELETE,&data); ;$67GK  
 ShowWindow(SW_SHOW); X%$1%)C9  
 SetForegroundWindow(); Q?bCQZ{-Lh  
 ShowWindow(SW_SHOWNORMAL); j 8)*'T  
 bTray=FALSE; `MHixQ;j  
} I7\T :Q[  
+K s3  
void CCaptureDlg::OnChange() "A*;V  
{ 0RjFa;j  
 RegisterHotkey(); /:v}Ni"6nF  
} h$#PboLd  
r PTfwhs  
BOOL CCaptureDlg::RegisterHotkey() J|F!$m{  
{ h1)ny1;  
 UpdateData(); 9^&B.6!6  
 UCHAR mask=0; 'h@&rr@5  
 UCHAR key=0; J/QqwoR  
 if(m_bControl) 1gnLKfc  
  mask|=4; B@@tKn_CQ  
 if(m_bAlt) C[';B)a  
  mask|=2; )W6l/  
 if(m_bShift) @r^s70{}  
  mask|=1; K,6{c^qf  
  key=Key_Table[m_Key.GetCurSel()]; 6b%IPbb  
 if(bRegistered){ 7[mP@ {  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); W56VA>ia  
  bRegistered=FALSE; yVQW|D0,j  
 } cs _  
 cMask=mask; Sb?Ua*(L:  
 cKey=key; L7nG5i  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >$yA ,N  
 return bRegistered; ?Q$a@)x#  
} V2xvuDHI  
c<lEFk!g  
  四、小结 R^=v&c{@  
WgG$ r  
  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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