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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: )[oegfnn-  
  Nawph  
  一、实现方法 Y23- Im  
oc7&iL  
  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: aJdd2,e  
H Rn Q*  
#pragma data_seg("shareddata") %-1-y]R|  
HHOOK hHook =NULL; //钩子句柄 m:SG1m_6  
UINT nHookCount =0; //挂接的程序数目 VKqIFM1b  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 #ueWU  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 oR}cE Sr  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey i&=I5$  
static int KeyCount =0; Pq u]?X  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 > mk>VM  
#pragma data_seg() (E[c-1s  
]Dec/Nnj  
  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。 y(^t&tgjS  
<n? cRk'.  
  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: '{*{  
_UI*W&*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR j*Uz.q?  
cKey,UCHAR cMask) 69N/_V  
{ 3CcCcZ9I  
 BOOL bAdded=FALSE; h}0}g]IUx  
 for(int index=0;index<MAX_KEY;index++){ fqpbsM;M]  
  if(hCallWnd[index]==0){ 5 nF46c  
   hCallWnd[index]=hWnd; >>bsr#aJ  
   HotKey[index]=cKey; ![1+=F !  
   HotKeyMask[index]=cMask; Fj;];1nt  
   bAdded=TRUE; &rs   
   KeyCount++; EdcbWf7  
   break; QiKci%=SX  
  } J'}G~rB<<  
 } ~?#>QN\\c  
 return bAdded; SbLm  
} n#$sLXVy  
//删除热键 5ir Ffr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OEi u,Y|@l  
{ >f$N G  
 BOOL bRemoved=FALSE; Aqy y\G;  
 for(int index=0;index<MAX_KEY;index++){ 3V uoDmG  
  if(hCallWnd[index]==hWnd){ O"^3,-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  R.x^  
    hCallWnd[index]=NULL; Y=83r]%  
    HotKey[index]=0;  3-~*  
    HotKeyMask[index]=0; _nwsIjsW  
    bRemoved=TRUE; u1 Z;n  
    KeyCount--; kx{LY`pY  
    break; 9[2qgw\D  
   } QQI,$HId  
  } ;*u"hIl1/  
 } $|"Y|3&X  
 return bRemoved; ZNDn! Sj  
} +}VaQ8ti4  
_ ck)yY?7  
11VtC)  
  DLL中的钩子函数如下: b!p]\B!  
NMs 8^O|0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \<ko)I#%  
{ / <C{$Gu  
 BOOL bProcessed=FALSE; >V%lA3  
 if(HC_ACTION==nCode) 6;:z?Q  
 { \1Xr4H u  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Yyxsj9  
   switch(wParam) zEVQ[y6BcM  
   {  zsM2R"[X  
    case VK_MENU: %8O1sF  
     MaskBits&=~ALTBIT; W{RZ@ 3ZY  
     break; HOaNhJ{7D  
    case VK_CONTROL: g ?.y7!m  
     MaskBits&=~CTRLBIT; ]SC|%B_*  
     break; R?t_tmKXC!  
    case VK_SHIFT: <uYrYqN  
     MaskBits&=~SHIFTBIT; =fRC$  
     break; ObPXVqG"?  
    default: //judge the key and send message &=^YN"=Z  
     break; 8KyRD1 (-R  
   } _jb' HP  
   for(int index=0;index<MAX_KEY;index++){ J5TT+FQ  
    if(hCallWnd[index]==NULL) aP$it 6Z  
     continue; n nOgmI7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8TBv~Q u  
    { efr9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Rtu"#XcBw+  
     bProcessed=TRUE; n!-]f.=P  
    } 6& (bL<8b  
   } dAWB.#  
  } KS'n$  
  else if((lParam&0xc000ffff)==1){ //有键按下 ;FGS(.mjlC  
   switch(wParam) ^GpLl   
   { de/oK c  
    case VK_MENU: DaS~bweMw  
     MaskBits|=ALTBIT; f\;w(_  
     break; 29AE B  
    case VK_CONTROL: 2$OV`qy@?  
     MaskBits|=CTRLBIT; wrQ0 2?  
     break; :5sjF:@  
    case VK_SHIFT: g#k@R'7E  
     MaskBits|=SHIFTBIT; \ 5.nr*5  
     break; x2,;ar\D  
    default: //judge the key and send message h2-v.Tjf  
     break; }_Ci3|G>%D  
   } 6:~<L!`&  
   for(int index=0;index<MAX_KEY;index++){ Sse%~:FL  
    if(hCallWnd[index]==NULL) 7@&mGUALO  
     continue; 9^u}~e #(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E~@&&d U8  
    { ' 7Mz]@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ze!/b|`xI  
     bProcessed=TRUE; GbC@ |  
    } BG6.,'~7o  
   } P{L S +.  
  } 2 g\O/oz  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 *knN?`(x  
   for(int index=0;index<MAX_KEY;index++){ hg %iv%1B'  
    if(hCallWnd[index]==NULL) 8J#xB  
     continue; 0&u=(;Dr\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) bY-koJo  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Y qmsL<  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 xw}rFY $  
   } blLl1Ak  
  } +DG-MM%\  
 } `_f&T}]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K ton$%Li  
} 8.G<+.  
R4X9g\KpAt  
  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: #zv&h`gY  
sib/~j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {qGXv@ I6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rd>>=~vx=/  
: t9sAD  
  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: ?V}ub>J/=  
-X_\3J  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) G1-r$7\  
{ IL:[0q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) @~Ys*]4UE  
 { a~ RY 8s  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 JMk2OK {0  
  SaveBmp(); 8[.&ca/[  
  return FALSE; dt@~8kS  
 } 2ql)]Skg6  
 …… //其它处理及默认处理 cuC' o\f  
} );T&pm:C>  
TMD\=8Na  
<"K2t Tg.  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 n=)LB& m  
S|xwYaoy%  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 M@l|n  
/Xj{]i3{  
  二、编程步骤 k( Ik+=u  
dWi< U4  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; *o5[P\'6  
QW'*^^  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; P l!E$   
2 FoLJ  
  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; ^62z\Y  
.Tm.M7  
  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; rg ; 4INs#  
}Ml BmD  
  5、 添加代码,编译运行程序。 E=8GSl/Jx  
%y\5L#T!>  
三、程序代码 [MQ* =*  
AFM+`{Cq  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "uP*pR^  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) -[J4nN&N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ !4!qHJISa  
#if _MSC_VER > 1000 mZXtHFMu  
#pragma once </Y(4Xwf=  
#endif // _MSC_VER > 1000 urE7ZKdI  
#ifndef __AFXWIN_H__ H5#]MOAP  
#error include 'stdafx.h' before including this file for PCH t*; KxQ+'?  
#endif am !ssF5s  
#include "resource.h" // main symbols 2D:,(  
class CHookApp : public CWinApp .N>*+U>>P  
{ P3YM4&6XA  
 public: x4PzP  
  CHookApp(); bI3GI:hp  
  // Overrides i#^YQCy  
  // ClassWizard generated virtual function overrides GLESngAl  
  //{{AFX_VIRTUAL(CHookApp) .#Nf0  
 public: E|>-7k")  
  virtual BOOL InitInstance();   NV-l9  
  virtual int ExitInstance(); CJh,-w{wJ"  
  //}}AFX_VIRTUAL /}2Y-GOU  
  //{{AFX_MSG(CHookApp) mR|5$1[b  
  // NOTE - the ClassWizard will add and remove member functions here. 4!OGNr$V@  
  // DO NOT EDIT what you see in these blocks of generated code ! pEz^z9  
  //}}AFX_MSG wfe4b  
  DECLARE_MESSAGE_MAP() w N`Nj m9!  
}; ~\2%h lA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); r~JGs?GH  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $=,pQ q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vE8BB$D  
BOOL InitHotkey(); %~k>$(u6  
BOOL UnInit(); mA$86 X_  
#endif 1=5HQ~|[TO  
[mQ1r*[j  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. si)>:e  
#include "stdafx.h" \2=I//YF  
#include "hook.h" m&b1H9ymd  
#include <windowsx.h> h_ccE 6]t  
#ifdef _DEBUG "f<gZsb  
#define new DEBUG_NEW R2?s NlF  
#undef THIS_FILE )iiaT~ ]  
static char THIS_FILE[] = __FILE__; /\<x8BJ  
#endif 'K02T:\iZ  
#define MAX_KEY 100 l`l6Y>c*]  
#define CTRLBIT 0x04  ^|zag  
#define ALTBIT 0x02 qy.$5-e:[9  
#define SHIFTBIT 0x01 UCjx   
#pragma data_seg("shareddata") JIw?]xa*  
HHOOK hHook =NULL; MRXw)NAw  
UINT nHookCount =0; >q&5Z   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ^n<YO=|u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT d (x'\4(K  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey U}DE9e{/!  
static int KeyCount =0; %FM26^  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ab2Cn|F  
#pragma data_seg() -BI!ZsC'  
HINSTANCE hins; $Zo|t a^  
void VerifyWindow(); ;]0d{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) pnE]B0e  
//{{AFX_MSG_MAP(CHookApp) Mh2b!B  
// NOTE - the ClassWizard will add and remove mapping macros here. =H8FV09x}  
// DO NOT EDIT what you see in these blocks of generated code! 4h_YVG]ur  
//}}AFX_MSG_MAP #]5KWXC'~  
END_MESSAGE_MAP() q2J |koT  
/n(0w`   
CHookApp::CHookApp() `p9N| V  
{ #:N#i  
 // TODO: add construction code here, [;7zg@Sa  
 // Place all significant initialization in InitInstance 4i{Xs5zk  
} nA_'j l  
ZklpnL*!  
CHookApp theApp; ^'`(E_2u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) i!8"T#  
{ ME0u|_dPjz  
 BOOL bProcessed=FALSE; T [xIn+w  
 if(HC_ACTION==nCode) @VW1^{.do^  
 { 52j3[in  
  if((lParam&0xc0000000)==0xc0000000){// Key up OI6Mx$  
   switch(wParam) RQ[/s lg  
   { RCYv2=m>Q  
    case VK_MENU: 6nE/8m  
     MaskBits&=~ALTBIT; 6;:D!},'c  
     break; .%7Le|Fb"  
    case VK_CONTROL: Zzg zeT+bv  
     MaskBits&=~CTRLBIT; {DKZ ~  
     break; 0Fon`3(^\  
    case VK_SHIFT: c1i:m'b_5  
     MaskBits&=~SHIFTBIT; # $k1w@  
     break; Yb`b /BMR  
    default: //judge the key and send message (0#$%US\  
     break; *yw!Y{e!9  
   } U ^GVz%\  
   for(int index=0;index<MAX_KEY;index++){ EV Z1Z  
    if(hCallWnd[index]==NULL) `pCy:J?d>l  
     continue; LTzdg >\oJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8rS;}Bt  
    { e(a,nZF.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2]9 2J  
     bProcessed=TRUE; |n tWMm:(  
    } ^7? WR?!  
   } =y@0i l+V  
  } $\vNST E  
  else if((lParam&0xc000ffff)==1){ //Key down ,{S $&g*  
   switch(wParam) Rvu5#_P  
   { %Rf9 KQ  
    case VK_MENU: =^rp= Az  
     MaskBits|=ALTBIT; $V`1<>4  
     break; D8u`6/^  
    case VK_CONTROL: T:'JA  
     MaskBits|=CTRLBIT; 5yK#;!:h  
     break; >KP,67  
    case VK_SHIFT: x=xo9wEg  
     MaskBits|=SHIFTBIT; o!~XYEXvUa  
     break; 4t }wMOR  
    default: //judge the key and send message t bR  
     break; elhP!"G  
   } aACPyfGQ  
   for(int index=0;index<MAX_KEY;index++) -N^Ah_9ek  
   { t7u*j-YE  
    if(hCallWnd[index]==NULL) g9JZ#BgZ  
     continue; <EgJm`V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {_*G"A 9  
    { "&f|<g5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ko[d axUB  
     bProcessed=TRUE; =hb)e}l  
    } !',%kvJI  
   } b/m.VL  
  } BQ u8$W  
  if(!bProcessed){ {D",ao   
   for(int index=0;index<MAX_KEY;index++){ /D;ugc*3  
    if(hCallWnd[index]==NULL) :vEfJSA 1<  
     continue; 1 ; <Vr<.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) x+za6e_k"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +FadOx7X$  
   } yv]|Ce@8A  
  } cMT:Ij];  
 } ?.F^Oi6 u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); uQn1kI[y  
} DjN1EP\Xx  
M\k[?i  
BOOL InitHotkey() u&S0  
{ ohx$;j  
 if(hHook!=NULL){ |4pl}:g/Z  
  nHookCount++; /0gr?I1wr7  
  return TRUE; 2bw) , W  
 } xSM1b5=Pu  
 else BH~zeJ*Pr  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); r0[<[jEh  
  if(hHook!=NULL) ^ swj!da  
   nHookCount++; h x5M)8#+  
  return (hHook!=NULL); CYE[$*g6y  
} W$,/hB& z  
BOOL UnInit() %>9L}OAm  
{ bfncO[Q,?  
 if(nHookCount>1){ `S-l.zSZ4B  
  nHookCount--; ~F,Y BX  
  return TRUE; d`flYNg4  
 } TW(X#T@Z6I  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Xp06sl7 M  
 if(unhooked==TRUE){ ic!% }S?  
  nHookCount=0; 4[kyzz x  
  hHook=NULL; yFmy  
 } o^(I+<el  
 return unhooked; J!~kqNI  
} `^^t#sT   
2(~Zl\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >jmHe^rH  
{ mejNa(D ^  
 BOOL bAdded=FALSE; ~4FzA,,  
 for(int index=0;index<MAX_KEY;index++){ wL:7G  
  if(hCallWnd[index]==0){ g| 3bM  
   hCallWnd[index]=hWnd; 0',buJncV  
   HotKey[index]=cKey; "?aI  
   HotKeyMask[index]=cMask; g)$KN,gGuO  
   bAdded=TRUE; cU ?F D  
   KeyCount++; (X\]!'A  
   break; : KFK2yD  
  } L?|}!  
 } `w >D6K+  
 return bAdded; v,QvCozOz  
} l/nBin&YGv  
{`M \}(E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tw zV-8\  
{ RR+kjK?  
 BOOL bRemoved=FALSE; P/WGB~NH  
 for(int index=0;index<MAX_KEY;index++){ @uV]7d"z(  
  if(hCallWnd[index]==hWnd){ M1NdlAAf  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ D~i5E9s5  
    hCallWnd[index]=NULL; !Z\Gv1  
    HotKey[index]=0; 3`{ vx  
    HotKeyMask[index]=0; rloxM~7!,)  
    bRemoved=TRUE; j<BRaT  
    KeyCount--; GLZ*5kw  
    break; "PN4{"`V  
   } VKYljY0#  
  } b|Ge#o  
 } C_q2bI  
 return bRemoved; $")Gd@aR  
} < -W 8  
ge?0>UU;~  
void VerifyWindow() }|;j2'(R  
{ CFW Hih  
 for(int i=0;i<MAX_KEY;i++){ (b[=~Nh'  
  if(hCallWnd!=NULL){ >m!Z$m([J  
   if(!IsWindow(hCallWnd)){ C<9GdN  
    hCallWnd=NULL; +p jB/#4  
    HotKey=0; J> ,w},`  
    HotKeyMask=0; VrfEa d  
    KeyCount--; ?Q"<AL>Z  
   } (X5y%~;V5a  
  } +IbV  
 } 4B[pQlg  
} +eH`mI0f  
n<FUaR>q}  
BOOL CHookApp::InitInstance() OMo/a%`  
{ V6c8o2G;+  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); WwWOic2  
 hins=AfxGetInstanceHandle(); os;9 4yd )  
 InitHotkey(); )[ UYCx'  
 return CWinApp::InitInstance(); -W@nc QL}  
} K+M\E[1W  
7CF>cpw  
int CHookApp::ExitInstance() ^pew'p HQ  
{ BKI-Dh  
 VerifyWindow(); zx:;0Z:S6>  
 UnInit(); 6+ptL-Zt<  
 return CWinApp::ExitInstance(); c'VCCXe  
} $>_`.*I/  
BT0;I  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Uj 4HVd  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1uKIO{d @  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ FwB xag:u  
#if _MSC_VER > 1000 <v_Wh@m  
#pragma once CXz9bhn<4  
#endif // _MSC_VER > 1000 FcZ)^RQ4G  
reYIF*  
class CCaptureDlg : public CDialog hMS:t(N{  
{ !@ P{s'<:  
 // Construction FxK!h.C.  
 public: 'ta&qp  
  BOOL bTray; bW/T}FN D  
  BOOL bRegistered; 7 u Q +]d  
  BOOL RegisterHotkey(); Syl9j]  
  UCHAR cKey; |=VWE>g  
  UCHAR cMask; Df2$2VU  
  void DeleteIcon(); ^e_uprZWm  
  void AddIcon(); QALr   
  UINT nCount; @J6r;4|&  
  void SaveBmp(); wKfq'W{  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor xqlnHf<G  
  // Dialog Data ]xb2W~  
  //{{AFX_DATA(CCaptureDlg) e~># M $  
  enum { IDD = IDD_CAPTURE_DIALOG }; ~X<$ l+5  
  CComboBox m_Key; 7tJ#0to  
  BOOL m_bControl; :TKx>~`  
  BOOL m_bAlt; XrMw$_0)  
  BOOL m_bShift; K+L9cv4 |*  
  CString m_Path; +G!# /u1  
  CString m_Number; \0;w7tdo  
  //}}AFX_DATA /?Y4C)G  
  // ClassWizard generated virtual function overrides w&es N$2  
  //{{AFX_VIRTUAL(CCaptureDlg) k[<i+C";  
 public: s{X+0_@Q  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 4T$jY}U  
 protected: Dh#5-Kf%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  4y5Q5)j  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); S_??G:i  
  //}}AFX_VIRTUAL b 5K"lPr  
  // Implementation kDQE*o  
 protected: l$HBYA\Qh  
  HICON m_hIcon; /']`}*d  
  // Generated message map functions &ns??:\+T  
  //{{AFX_MSG(CCaptureDlg) 9X#]Lg?b  
  virtual BOOL OnInitDialog(); [;-;{ *{G  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5__B M5|  
  afx_msg void OnPaint(); V}2[chbl  
  afx_msg HCURSOR OnQueryDragIcon(); Lq6nmjL  
  virtual void OnCancel(); ~SA>$  
  afx_msg void OnAbout(); bh\2&]Di/  
  afx_msg void OnBrowse(); ;Tq4!w'rH  
  afx_msg void OnChange(); Ag(JSVY  
 //}}AFX_MSG \7$"i5  
 DECLARE_MESSAGE_MAP() `GY]JVW  
}; qn{9vr  
#endif cL#zE  
OQg}E@LZ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4 s9^%K\8{  
#include "stdafx.h" Edcv>}PfE  
#include "Capture.h" |?f~T"|>  
#include "CaptureDlg.h" &K=) YpT  
#include <windowsx.h> ,PKUgL}w  
#pragma comment(lib,"hook.lib") v-!Spf  
#ifdef _DEBUG <+%y  
#define new DEBUG_NEW 1`Bhis9X8  
#undef THIS_FILE D^];6\=.i  
static char THIS_FILE[] = __FILE__; D6yE/QeK4  
#endif :y{@=E=XSC  
#define IDM_SHELL WM_USER+1 ] ONmWo77o  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HuSE6an  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ao (Lv+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Gw6!cp|/  
class CAboutDlg : public CDialog _]3#C[1L  
{ nS.qK/.s  
 public: g86^Z%c(k  
  CAboutDlg(); -J]N &[  
  // Dialog Data hS%oQ)zvE  
  //{{AFX_DATA(CAboutDlg) lPA}06hU  
  enum { IDD = IDD_ABOUTBOX }; Ts=TaRwWf  
  //}}AFX_DATA \qG` ts  
  // ClassWizard generated virtual function overrides CA$|3m9)NM  
  //{{AFX_VIRTUAL(CAboutDlg) ose)\rM'  
 protected: w#L`|cYCm  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L1@<7?@X  
  //}}AFX_VIRTUAL (Nf!E[ }Z  
  // Implementation ~@}n}aV'!  
 protected: K}whqe]j  
  //{{AFX_MSG(CAboutDlg) Rp_}_hL0  
  //}}AFX_MSG 0Uk;&a0s  
  DECLARE_MESSAGE_MAP() 8f'r_,"  
}; M4d4b  
:V)=/mR  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ):L0{W{  
{ (J(SwL|  
 //{{AFX_DATA_INIT(CAboutDlg) YXU2UIY<~  
 //}}AFX_DATA_INIT ]yFO~4Nu  
} }^odUIj  
^ Vc(oa&;  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /kO%aN  
{ ?xQm_ 91X^  
 CDialog::DoDataExchange(pDX); 9:E.Iy  
 //{{AFX_DATA_MAP(CAboutDlg) 4a.8n!sys  
 //}}AFX_DATA_MAP \y7\RV>>3b  
} Oo>Uu{{  
Jep/%cT$w  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Gch3|e  
 //{{AFX_MSG_MAP(CAboutDlg) DsHm,dZ  
 // No message handlers x IL]Y7HWM  
 //}}AFX_MSG_MAP  Qk.[#  
END_MESSAGE_MAP() >ca`0gu  
S1i~r+jf  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @'J[T:e  
: CDialog(CCaptureDlg::IDD, pParent) h}oV)z6  
{ %;GRR (K  
 //{{AFX_DATA_INIT(CCaptureDlg) {k'$uW `  
  m_bControl = FALSE;  N=!k2+  
  m_bAlt = FALSE; T{'oR .g,  
  m_bShift = FALSE; G{a_\'7  
  m_Path = _T("c:\\"); G/1V4-@  
  m_Number = _T("0 picture captured."); yOk]RB<'r  
  nCount=0;  6\QsK96_  
  bRegistered=FALSE; B6!ni@$M8X  
  bTray=FALSE; `Q>qmf_Fi  
 //}}AFX_DATA_INIT ExOSHKU,e  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5F 8'f)  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); I]91{dq  
} a3 t||@v!  
)Tn(!.  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) M=5hp&=  
{ \@ N[  
 CDialog::DoDataExchange(pDX); 3X`N~_+  
 //{{AFX_DATA_MAP(CCaptureDlg) axkNy}ct  
  DDX_Control(pDX, IDC_KEY, m_Key); NV2$ >D  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); OuPfB  
  DDX_Check(pDX, IDC_ALT, m_bAlt); P@Pe5H"o  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 'H1k  
  DDX_Text(pDX, IDC_PATH, m_Path); `4qtmbj  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ;T>.  
 //}}AFX_DATA_MAP `2G%&R,k"D  
} .;:dG  
J p0j  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) T&E'MB  
//{{AFX_MSG_MAP(CCaptureDlg) Z?."cuTt  
 ON_WM_SYSCOMMAND() +OO my  
 ON_WM_PAINT() U)('}u=b  
 ON_WM_QUERYDRAGICON() o fCN[u  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) pEG!j ~  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Tx$bg(  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ,esUls'nz'  
//}}AFX_MSG_MAP [O3)s]|  
END_MESSAGE_MAP() z{U^j:A  
|7miT!y8  
BOOL CCaptureDlg::OnInitDialog() 4tp }  
{ )u=a+T  
 CDialog::OnInitDialog(); c 1{nOx  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); #b;TjnC5{$  
 ASSERT(IDM_ABOUTBOX < 0xF000); i%r+/D)KvG  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Z4T{CwD`D  
 if (pSysMenu != NULL) t8~isuiK  
 { qI2&a$Zb$  
  CString strAboutMenu; WG5)-;>q|  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .DhB4v&  
  if (!strAboutMenu.IsEmpty()) 6eK7Jv\K  
  { R)]+>M-.  
   pSysMenu->AppendMenu(MF_SEPARATOR); e1R<+`]  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {"*gX&;~  
  } (S63:q&g  
 } :CXm@yF~4=  
 SetIcon(m_hIcon, TRUE); // Set big icon f(c#1AJE53  
 SetIcon(m_hIcon, FALSE); // Set small icon mqQC`Aqx:  
 m_Key.SetCurSel(0); >ZnnGX6$(  
 RegisterHotkey(); N >];xb>  
 CMenu* pMenu=GetSystemMenu(FALSE); qoC<qn{.a  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,mE}#cyY  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6dqI{T-i?  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 3?wL)6Uj8J  
 return TRUE; // return TRUE unless you set the focus to a control B5#>ieM*  
} Y\9zjewc  
?Pt*4NaT;  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (ZD~Q_O-  
{ %/%TR@/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) `_pVwa<@w  
 { ]/?$DNjCc  
  CAboutDlg dlgAbout; xL!@$;J  
  dlgAbout.DoModal(); 7$JE+gL/7  
 } _Q\<|~  
 else  0gJ{fcI  
 { ua%j}%G(  
  CDialog::OnSysCommand(nID, lParam); |k/;1.b!9(  
 } -^$IjK-N  
} < _ <?p&  
\|R\pS}4  
void CCaptureDlg::OnPaint() k6|/ik9C  
{ 207h$a,  
 if (IsIconic()) 6oq/\D$6~  
 { >u?a#5R:m  
  CPaintDC dc(this); // device context for painting b}m@2DR'|m  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); L&Pj0K-HT3  
  // Center icon in client rectangle )bB Va^  
  int cxIcon = GetSystemMetrics(SM_CXICON); H:`H4 S}  
  int cyIcon = GetSystemMetrics(SM_CYICON); d+IN-lR(  
  CRect rect; 0@}:`OynX  
  GetClientRect(&rect); F Xp_`9.zH  
  int x = (rect.Width() - cxIcon + 1) / 2; `s_k+ g  
  int y = (rect.Height() - cyIcon + 1) / 2; HurF4IsHk  
  // Draw the icon nM H:7[x3  
  dc.DrawIcon(x, y, m_hIcon); O?qM=W  
 } 8MBvp*  
 else ?l ](RI  
 { xPP]RoPR  
  CDialog::OnPaint(); a}kPc}n\  
 } 3q0S}<h al  
} #i-b|J+%  
U{8x.CJ]  
HCURSOR CCaptureDlg::OnQueryDragIcon() SM[VHNr,-  
{ lxtt+R  
 return (HCURSOR) m_hIcon; n@//d.T  
} Jr,**,wA  
I\$?'q>  
void CCaptureDlg::OnCancel() wI#R\v8(`n  
{ .;%`I  
 if(bTray) O+ J0X*&x  
  DeleteIcon(); Q^Q6| n  
  CDialog::OnCancel(); mC!^`y)  
} fOz.kK[]  
p!+bn,?G  
void CCaptureDlg::OnAbout() W$Z8AZ{E  
{ .-.b:gdO(  
 CAboutDlg dlg; CWS]821;  
 dlg.DoModal(); 7G  3e  
} U/>l>J5  
L [X "N  
void CCaptureDlg::OnBrowse() kC/An@J^#  
{ RtF!(gd  
 CString str; {6HgKI  
 BROWSEINFO bi; Xrzpn&Y=#  
 char name[MAX_PATH]; F)=*Ga  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); w)"F=33}5  
 bi.hwndOwner=GetSafeHwnd(); 9mB] \{^  
 bi.pszDisplayName=name; x3 01uf[  
 bi.lpszTitle="Select folder"; T&]IPOH9  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; E&> 2=$~  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); muIJeQ.C  
 if(idl==NULL) Rh{`#dI~=  
  return; 5O:4-} hz  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]nm(V  
 str.ReleaseBuffer(); $!\Z_ :  
 m_Path=str; }}4uLGu)  
 if(str.GetAt(str.GetLength()-1)!='\\') F[~~fm_  
  m_Path+="\\"; k3&/Ei5  
 UpdateData(FALSE); /=:F w}vt  
} HnY.=_G  
^AR kjYt  
void CCaptureDlg::SaveBmp() @{@)gE  
{ cs)R8vuB)z  
 CDC dc; qDjH^f  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); -hZw.eChQa  
 CBitmap bm; ]t_ Wl1*|  
 int Width=GetSystemMetrics(SM_CXSCREEN); vW5>{  
 int Height=GetSystemMetrics(SM_CYSCREEN); 8D`TN8[W  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Q@cYHFi~+  
 CDC tdc; #[y2nK3zF  
 tdc.CreateCompatibleDC(&dc); |5\: E}1  
 CBitmap*pOld=tdc.SelectObject(&bm); *):s**BJ$  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); DN|+d{^lN  
 tdc.SelectObject(pOld); 1A N)%  
 BITMAP btm; @g1T??h   
 bm.GetBitmap(&btm); /F}dC/W  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 'F7UnkKO|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); E{[>j'dwc  
 BITMAPINFOHEADER bih; `i6q\-12n  
 bih.biBitCount=btm.bmBitsPixel; nC#SnyUO  
 bih.biClrImportant=0; {"\pMY'7  
 bih.biClrUsed=0; X^d}eWP`I  
 bih.biCompression=0; \d QRQL{LL  
 bih.biHeight=btm.bmHeight; s~g]`/h$r  
 bih.biPlanes=1; U DHMNubB  
 bih.biSize=sizeof(BITMAPINFOHEADER); #kAk d-QY6  
 bih.biSizeImage=size; ?)e6:T(  
 bih.biWidth=btm.bmWidth; , 4@C%  
 bih.biXPelsPerMeter=0; 4YCuO%  
 bih.biYPelsPerMeter=0; j/hm)*\io  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 68nPz".X  
 static int filecount=0; X'usd$[ .  
 CString name; ^*WO*f>y  
 name.Format("pict%04d.bmp",filecount++); 5[H1nC @C  
 name=m_Path+name; 3IQ-2 X--  
 BITMAPFILEHEADER bfh; (YHK,aC>u  
 bfh.bfReserved1=bfh.bfReserved2=0; eyG[1EEU  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ]O&yy{yYK  
 bfh.bfSize=54+size; aa\?k\h'7X  
 bfh.bfOffBits=54; CjLiLB  
 CFile bf; 6' 9zpe@`  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ u\=yY.   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); &&te(DC\  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); pwo @ S"  
  bf.WriteHuge(lpData,size); Qe]aI7Ei  
  bf.Close(); 2z9N/SyN  
  nCount++; %wIb@km  
 } \Z625jt  
 GlobalFreePtr(lpData); sh}eKwh  
 if(nCount==1) 'HvJ]}p  
  m_Number.Format("%d picture captured.",nCount); GX%r-  
 else &M2fcw?  
  m_Number.Format("%d pictures captured.",nCount); G[Jz(/yNH  
  UpdateData(FALSE); TGI`}#  
} Y2(,E e2  
;et(Yi;9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?1Uq ud  
{ ;i&t|5y~  
 if(pMsg -> message == WM_KEYDOWN) r\m2Oo)]  
 { l!%V&HJV  
  if(pMsg -> wParam == VK_ESCAPE) Ol*|J  
   return TRUE; =${ImMwj  
  if(pMsg -> wParam == VK_RETURN) # 0/,teJ k  
   return TRUE; b%e7rY2  
 } 'PdUSv|lH  
 return CDialog::PreTranslateMessage(pMsg); .a}!!\@  
} r%%<   
(sEZNo5n  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) i^V3u  
{ )7a 4yTg!~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ QVWUm!  
  SaveBmp(); +aRHMH  
  return FALSE; #=I5_u  
} u7bji>j  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ nLnzl  
 CMenu pop; kl#) 0yqN0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); oN Rp  
 CMenu*pMenu=pop.GetSubMenu(0); &p.7SPQ8/  
 pMenu->SetDefaultItem(ID_EXITICON); )Z63 cr/  
 CPoint pt; T0K*!j}O  
 GetCursorPos(&pt); p.!p6ve){  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ivPX_#QI  
 if(id==ID_EXITICON) {e83 A /{  
  DeleteIcon(); 4m6%HV8{}[  
 else if(id==ID_EXIT) ' y_2"  
  OnCancel(); =v~$&@  
 return FALSE; ie<m)  
} Ve t<,;Te  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Lq{/r+tt/  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) DO ,7vMO  
 AddIcon(); {0Ej *%  
 return res; >RKepV(X7  
} bdvVPjGc&  
TJkWL2r0c  
void CCaptureDlg::AddIcon() da5fKK/s  
{ fx/If  
 NOTIFYICONDATA data; fl<j]{*v  
 data.cbSize=sizeof(NOTIFYICONDATA); #\MkbZc d  
 CString tip; IdciGS6 t  
 tip.LoadString(IDS_ICONTIP); >~@ABLp 6  
 data.hIcon=GetIcon(0); }~! D]/B  
 data.hWnd=GetSafeHwnd(); vf['$um  
 strcpy(data.szTip,tip); K2-nP2Go?  
 data.uCallbackMessage=IDM_SHELL; ". wG~H  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; UUxP4  
 data.uID=98; ,~7+r#q7  
 Shell_NotifyIcon(NIM_ADD,&data); .KF(_ 92  
 ShowWindow(SW_HIDE); 'z">4{5  
 bTray=TRUE; XC\'8hL:  
} ~JohcU}d  
]H=P(Z -  
void CCaptureDlg::DeleteIcon() _)^`+{N<  
{ ;e\K8*o  
 NOTIFYICONDATA data; IYB;X  
 data.cbSize=sizeof(NOTIFYICONDATA); _H$Z }2g<z  
 data.hWnd=GetSafeHwnd(); )Tad]Hd"W  
 data.uID=98; K?,`gCN}v  
 Shell_NotifyIcon(NIM_DELETE,&data); Hv|(V3-  
 ShowWindow(SW_SHOW); {fu[&@XV  
 SetForegroundWindow(); ufS0UD8%H  
 ShowWindow(SW_SHOWNORMAL); )iCg,?SSw=  
 bTray=FALSE; a}7P:e*u  
} r8[Ywn <u  
eHH9#Vrhc$  
void CCaptureDlg::OnChange() [N1[khY`  
{ UQCond+K  
 RegisterHotkey(); *AA78G|  
} a,\GOy(q{  
+(vL ~  
BOOL CCaptureDlg::RegisterHotkey() KPI[{T\`ZM  
{ >2;KPV0H  
 UpdateData(); u 9%AK g}~  
 UCHAR mask=0; &Ef6'  
 UCHAR key=0; |~YhN'OJ  
 if(m_bControl) t)b /c:ql  
  mask|=4; 6>- Gi  
 if(m_bAlt) SRc|9W5t*J  
  mask|=2; @RLlkWGc  
 if(m_bShift) 1xMD )V:  
  mask|=1; LQ4F/[1}  
  key=Key_Table[m_Key.GetCurSel()]; j'&a)-Wx_  
 if(bRegistered){ bv'Z~@<c  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); sys;Rz2  
  bRegistered=FALSE; E0"DHjR  
 } Xe\,:~  
 cMask=mask; -.hH,zm  
 cKey=key; j% E9@#  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (r$QQO) /  
 return bRegistered; W^dRA xVX  
} T( sEk  
4t0-L]v4.*  
  四、小结 &}vc^io  
B~/ejC!  
  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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