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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: pR`.8MMc8  
  ;#` Z(A}  
  一、实现方法 Sh2q#7hf  
JS({au  
  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: ;Qk*h'}f  
dE/Vl/:  
#pragma data_seg("shareddata") "^22 Y}VB  
HHOOK hHook =NULL; //钩子句柄 =!{}:An1$  
UINT nHookCount =0; //挂接的程序数目 &>L\unS  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 >@ h0@N  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 P)>WIQSr  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey rIW`(IG_  
static int KeyCount =0; Tk.MtIs)V}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 RTLu]Bry  
#pragma data_seg() 3~s0ux[  
r;upJbSX  
  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。  gT O%  
-uy}]s5Qu  
  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: 1PLKcU  
jqb,^T|j;m  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR OEdp:dW|  
cKey,UCHAR cMask) JXUO?9  
{ n9cWvy&f  
 BOOL bAdded=FALSE; 7-W(gD!`  
 for(int index=0;index<MAX_KEY;index++){ 4sNM#]%|  
  if(hCallWnd[index]==0){ OSfwA&  
   hCallWnd[index]=hWnd; la|#SS95  
   HotKey[index]=cKey; PM%./  
   HotKeyMask[index]=cMask; ^h^j:!76j  
   bAdded=TRUE; sE>'~ +1_O  
   KeyCount++; zs[t<`2  
   break; ``aoLQc`  
  } X903;&Cim  
 } xv4nYm9  
 return bAdded; gj6"U {D  
} Srol0D I  
//删除热键 O}IS{/^7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) GbB&kE3KP  
{ "]zq<LmX  
 BOOL bRemoved=FALSE; *zz/U (9D  
 for(int index=0;index<MAX_KEY;index++){ r)U9u 0  
  if(hCallWnd[index]==hWnd){ nU`vj`K   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [}P|OCW  
    hCallWnd[index]=NULL; V+Cb.$@  
    HotKey[index]=0; El"XF?OgpP  
    HotKeyMask[index]=0; tC|5;'m.2  
    bRemoved=TRUE; "GZhr[AW  
    KeyCount--; Szwa2IdI.  
    break; qDcl;{L  
   } 3bE^[V8/  
  } 2uiiTg>  
 } "* 'rzd  
 return bRemoved; W{ Nhh3  
} s2w .V O  
RsTpjY*Xb  
9;h 1;9sC|  
  DLL中的钩子函数如下: <`6-J `.  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E.6^~'/  
{ Yng9_w9Y  
 BOOL bProcessed=FALSE; cC4*4bMm  
 if(HC_ACTION==nCode) D }b+#G(m[  
 { BMFpkK9|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {&K#~[)  
   switch(wParam) 3z ~zcQ^\  
   {  Vfc 9 +T+  
    case VK_MENU: &?zJ|7rh@|  
     MaskBits&=~ALTBIT; F\Tlpp9  
     break; $9Z8P_^.0(  
    case VK_CONTROL: ~^Vt)/}Q  
     MaskBits&=~CTRLBIT; -*?a*q/#nQ  
     break; YW/YeID  
    case VK_SHIFT: hnE@+(d=qJ  
     MaskBits&=~SHIFTBIT; M=0I 3o}J  
     break; mjy%xzVr6^  
    default: //judge the key and send message 8a-[Q  
     break; W P.6ea7k  
   } &a48DCZ  
   for(int index=0;index<MAX_KEY;index++){ LuQ=i`eXx  
    if(hCallWnd[index]==NULL) .bnoK  
     continue; |? r,W ~9`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V3I&0P k  
    { 4fpz;2%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); }.` ycLW'  
     bProcessed=TRUE; .F 3v)  
    } 'lIT7MK  
   } b/O~f8t  
  } (Ptv#LSUX  
  else if((lParam&0xc000ffff)==1){ //有键按下 chfj|Ce]x  
   switch(wParam) Oo=} j  
   { =b9?r  
    case VK_MENU: Cww$ A %}  
     MaskBits|=ALTBIT; ULQ*cW&;?  
     break; jQsucs5$h  
    case VK_CONTROL: C/ ;f)k<  
     MaskBits|=CTRLBIT; ,v)@&1Wh:  
     break; jOEb1  
    case VK_SHIFT: KY4|C05 ,  
     MaskBits|=SHIFTBIT; vco:6Ab$  
     break; YSv\T '3  
    default: //judge the key and send message 5:56l>0  
     break; P9Rq'u  
   } /r}t  
   for(int index=0;index<MAX_KEY;index++){ BnAia3z  
    if(hCallWnd[index]==NULL) gpE5ua&  
     continue; r=qb[4HiV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zy5@K)  
    { Isoqs(Oi  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -+ $u  
     bProcessed=TRUE; rj<%_d'Z`  
    } 0W]Wu[k  
   } cWh Aj>?_Q  
  } n;O 3.2  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 JLc\KVmF  
   for(int index=0;index<MAX_KEY;index++){ |h6)p;`gc  
    if(hCallWnd[index]==NULL) C{Aeud #5  
     continue; iFga==rw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) yUNl)E  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \ m 2[  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 6OIA>%{  
   } /Q{Jf+>R>  
  } iM}cd$r{  
 } /mqEc9sq,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -41L^Di\  
} 51&wH  
rQ~%SUM7  
  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: V3F2Z_VH2  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Sy8o/-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6,cyi|s  
Yxi.A$g  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: dd98v Vj  
bpKb<c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _3kAN .g  
{ ]+fL6"OD/2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) o.y4&bC14;  
 { sA}=o.\j:  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 aD%")eP%&  
  SaveBmp(); [.3M>,)+-  
  return FALSE; X*d,z~k%*d  
 } #gi&pR'$  
 …… //其它处理及默认处理 ZTHr jW1  
} 7\5 [lM  
?vM{9!M  
Eepy%-\  
  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。 L(AY)gB  
Nu|?s-   
  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。 mezP"N=L~  
`[Z?&'CRQ  
  二、编程步骤 ]]9eUw=  
zXp{9P\c  
  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"; wK|&[m s  
d]w*fn  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; rS6iZp,  
.X YSO  
  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; |p3]9H  
I,t 0X)  
  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; oX!s u  
zBqr15  
  5、 添加代码,编译运行程序。 >Li ~Og@  
+O9l@X$l=  
三、程序代码 Z#^2F8,]  
H6e ^" E  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL D~8f6Ko"m  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) =:9n+7~$  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ RI-whA8+  
#if _MSC_VER > 1000 w;{k\=W3Ff  
#pragma once a08B8  
#endif // _MSC_VER > 1000 RC\TPG/8!  
#ifndef __AFXWIN_H__ */?L_\7  
#error include 'stdafx.h' before including this file for PCH OJ] {FI  
#endif )e]:T4*vo  
#include "resource.h" // main symbols qdUlT*fw  
class CHookApp : public CWinApp @{XN}tWDOp  
{ )M^;6S  
 public: j+Wgjf  
  CHookApp(); | ql!@M(p  
  // Overrides `| R8WM  
  // ClassWizard generated virtual function overrides iY.~N#Q  
  //{{AFX_VIRTUAL(CHookApp) `4Nc(aUr  
 public: 0~BQ8O=+mn  
  virtual BOOL InitInstance(); 9.PY49|  
  virtual int ExitInstance(); H$\?D+xlf  
  //}}AFX_VIRTUAL qF( ]Ce  
  //{{AFX_MSG(CHookApp) uCmdNY  
  // NOTE - the ClassWizard will add and remove member functions here. 2c9@n9Vx3a  
  // DO NOT EDIT what you see in these blocks of generated code ! y$\K@B4  
  //}}AFX_MSG Re,0RM\  
  DECLARE_MESSAGE_MAP() 2ZLK`^S  
}; zM[WbB+"m  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); }L:LcM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =oiY'}%(i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _H:SoJ'  
BOOL InitHotkey(); =fG(K!AQ  
BOOL UnInit(); ~oSLWA9  
#endif @RT yCr  
xZ4\.K\f]  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1mA)=hu  
#include "stdafx.h" <2|x]b 8  
#include "hook.h" VVCCPK^<  
#include <windowsx.h> Bg7?1m  
#ifdef _DEBUG RAf+%h*  
#define new DEBUG_NEW zXVQLz5  
#undef THIS_FILE a$;+-Y  
static char THIS_FILE[] = __FILE__; f ( UcJx  
#endif Z<ke!H  
#define MAX_KEY 100 /Tv< l  
#define CTRLBIT 0x04 z[OW%(vrm  
#define ALTBIT 0x02 Z AZQFr'*  
#define SHIFTBIT 0x01 !K`;fp!  
#pragma data_seg("shareddata") )t)tk=R9N  
HHOOK hHook =NULL; }yB@?  
UINT nHookCount =0; Td8'z'  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey wiwJD}3h'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT W,wg@2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey = ng\  
static int KeyCount =0; TD\QX2m  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift hkW"D<i i-  
#pragma data_seg() <NS= <'U  
HINSTANCE hins; )xTp7YnZ;  
void VerifyWindow(); :Z1_;`>CT  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) FVF: 1DT  
//{{AFX_MSG_MAP(CHookApp) 17};I7  
// NOTE - the ClassWizard will add and remove mapping macros here. I`5MAvP  
// DO NOT EDIT what you see in these blocks of generated code! K8e>sU.  
//}}AFX_MSG_MAP _$Z46wHmB  
END_MESSAGE_MAP() p4aM`PW8>=  
.l#Pmd!  
CHookApp::CHookApp() M~ *E!  
{ 5HOhk"  
 // TODO: add construction code here, Zsf<)Vx  
 // Place all significant initialization in InitInstance U/jJ@8  
} ym,S /Uz  
[~jh Ov^  
CHookApp theApp; @^;\(If2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?]paAP;4  
{ 1 u&P,&T  
 BOOL bProcessed=FALSE; eZg31.  
 if(HC_ACTION==nCode) z|pH>R?:  
 { @&h<jM{D  
  if((lParam&0xc0000000)==0xc0000000){// Key up oD"fRBS+$  
   switch(wParam) EE%OD~u&9#  
   { ?w<x_Lo  
    case VK_MENU: b<:s{f"t,  
     MaskBits&=~ALTBIT; ^P{'l^CVX  
     break; ,QKG$F  
    case VK_CONTROL: B /Dj2  
     MaskBits&=~CTRLBIT; ;gW~+hW^  
     break; -R&h?ec  
    case VK_SHIFT: L;BYPZR  
     MaskBits&=~SHIFTBIT; RA\H?1;8C  
     break; 1noFXzeU3  
    default: //judge the key and send message *w@>zkBl  
     break; mZq*o<kTA  
   } *>\RGL;]8  
   for(int index=0;index<MAX_KEY;index++){ 0Fi7|  
    if(hCallWnd[index]==NULL) =}Cb?C[;  
     continue; 2\s-4H| q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {J99F  
    { Gjv'$O2_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]%mg(&p4  
     bProcessed=TRUE; x,p|n  
    } H;$w^Tr  
   } Z2 t0l%  
  } j l7e6#zu  
  else if((lParam&0xc000ffff)==1){ //Key down Sfvi|kZX  
   switch(wParam) @j^qT-0M  
   {  gu"Agct4  
    case VK_MENU: - iJ[9O  
     MaskBits|=ALTBIT; 67n1s  
     break; _xmM~q[c7p  
    case VK_CONTROL: &"L3U  
     MaskBits|=CTRLBIT; ZZeqOu7^  
     break; sAnH\AFm  
    case VK_SHIFT: 1F$a My?  
     MaskBits|=SHIFTBIT; n P69W  
     break; z?yADYr9  
    default: //judge the key and send message g8vN^nQf[  
     break; YJ:CqTy  
   } \k g2pF[V  
   for(int index=0;index<MAX_KEY;index++) @A yC0}  
   { o >W}1_  
    if(hCallWnd[index]==NULL) 2&=;$2?}  
     continue; 31bKgU{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y2<g96  
    { =e ;\I/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ls/:/x(5d  
     bProcessed=TRUE; lSbAZ6  
    } [F6=JZ  
   } p?d Ma_ g  
  } DVCc^5#  
  if(!bProcessed){ S:oZ&   
   for(int index=0;index<MAX_KEY;index++){ a?D\H5TF-  
    if(hCallWnd[index]==NULL)  [bv.`  
     continue; O'!k$iJNb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) S'?XI@t[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); MiRMjQ2  
   } Ozn7C?\*  
  } os#j;C]l  
 } `;i| %$TU  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (M[Kh ^  
} ) d\Se9!  
N5~g:([k  
BOOL InitHotkey() qk:F6kL\`  
{ h`5au<h<  
 if(hHook!=NULL){ > m5j.GP;  
  nHookCount++; Gz6FwU8L  
  return TRUE; i:W oT4  
 } Ar>Om!]=v  
 else Q&n|tQ*4  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); wV U(Du  
  if(hHook!=NULL) VQLo vt"  
   nHookCount++; W]rXt,{ &  
  return (hHook!=NULL); xu_Tocvop  
} o_={xrmIA  
BOOL UnInit() hbN*_[  
{ #Dy;x\a  
 if(nHookCount>1){ "\> <UJ  
  nHookCount--; m ;[z)-&"  
  return TRUE; lW7kBCsz#  
 } F,4Q  
 BOOL unhooked = UnhookWindowsHookEx(hHook); #%+IU  
 if(unhooked==TRUE){ &_!BMzp4  
  nHookCount=0; {!E<hQ2<$9  
  hHook=NULL; dJCu`34Y'|  
 } W+1V&a}E  
 return unhooked; YBg\L$| n  
} t6 js@Ih  
'!En,*'IS  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !fz`O>-mZ  
{ ;'cv?3Y  
 BOOL bAdded=FALSE; } #%sI"9  
 for(int index=0;index<MAX_KEY;index++){ ym1TGeFAq  
  if(hCallWnd[index]==0){ 6G1Z"9<2*  
   hCallWnd[index]=hWnd; @*_#zU#g  
   HotKey[index]=cKey; 2]Y (<PC  
   HotKeyMask[index]=cMask; !%5{jO1  
   bAdded=TRUE; <!=TxV>}A  
   KeyCount++; B#q5Ut  
   break; HlV3rYh  
  } Fbk<qQH  
 } +n)(\k{  
 return bAdded; hWDgMmo7  
} )\^%w9h  
H&%=>hyX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) d(fgv  
{ 6x -PGq  
 BOOL bRemoved=FALSE;  )?4m}  
 for(int index=0;index<MAX_KEY;index++){ Z$[A.gD4  
  if(hCallWnd[index]==hWnd){ K$(U>D|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u5idH),<  
    hCallWnd[index]=NULL; SHwl^qVk[  
    HotKey[index]=0; #|$7. e  
    HotKeyMask[index]=0; RRq*CLj  
    bRemoved=TRUE; P,wFib^1  
    KeyCount--; +mxsjcq0  
    break; A"9aEOX-?i  
   } c&R .  
  } w.0.||C O  
 } -j<UhW  
 return bRemoved; \HH|{   
} 4.VEE~sH$  
zpa'G1v  
void VerifyWindow() >EMCG.**  
{ 8zpK; +  
 for(int i=0;i<MAX_KEY;i++){ /CZOO)n  
  if(hCallWnd!=NULL){ *|`'L  
   if(!IsWindow(hCallWnd)){ <F!:dyl  
    hCallWnd=NULL; s&fU|Jk8  
    HotKey=0; c%B=TAs5c  
    HotKeyMask=0; [s7I.rdGzz  
    KeyCount--; Rl S=^}>  
   } NS&~n^*k<  
  } M{(Y|3W  
 } OB"QWdh  
} }!.7QpA$  
Kfj*#) SZ  
BOOL CHookApp::InitInstance() 2_Pe/  
{ #}jf TM  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); .{8lG^0U<  
 hins=AfxGetInstanceHandle(); )}6:Ke)  
 InitHotkey(); Pb~S{):  
 return CWinApp::InitInstance(); [PQG]"  
} s5z@`M5'm  
b,K1EEJ  
int CHookApp::ExitInstance() pkM32v-  
{ 9ge$)q@3  
 VerifyWindow(); {+`ep\.$&  
 UnInit(); ||_F /AD  
 return CWinApp::ExitInstance(); ]_-$  
} $MsM$]~  
6zNN 8  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?9PNCd3$d  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) w'qV~rN~tc  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ w$t2Hd  
#if _MSC_VER > 1000 D@W m-  
#pragma once JHMj4Zkp  
#endif // _MSC_VER > 1000 ^\wosB3E  
@yek6E&9  
class CCaptureDlg : public CDialog ___+5r21\  
{ ^.<IT"  
 // Construction Q2#)Jx\6!  
 public: ,Qh4=+jwqn  
  BOOL bTray; o= 8yp2vG  
  BOOL bRegistered; F 'h[g.\}  
  BOOL RegisterHotkey(); N.2rF  
  UCHAR cKey; CP?\'a"Kt  
  UCHAR cMask; Lv5AtZl}  
  void DeleteIcon(); x,1&ml5  
  void AddIcon(); =lffr?#&B  
  UINT nCount; RnTPU`  
  void SaveBmp(); #:{u1sq;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor "%Rx;xw|  
  // Dialog Data $MR{3-  
  //{{AFX_DATA(CCaptureDlg) #G\)ZheG  
  enum { IDD = IDD_CAPTURE_DIALOG }; f j"S|]e  
  CComboBox m_Key; z#-&MJ  
  BOOL m_bControl; *.K}`89T  
  BOOL m_bAlt; +6TKk~0e^  
  BOOL m_bShift; >uUbWKn3  
  CString m_Path; M$?~C~b!*  
  CString m_Number; LAvAjvRc  
  //}}AFX_DATA (*M(gM{;  
  // ClassWizard generated virtual function overrides 7%F9.h  
  //{{AFX_VIRTUAL(CCaptureDlg) M`5^v0,C  
 public: 8T2$0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); jy1*E3vQ  
 protected: %iX +"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mM95BUB  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); LOOv8'%O8  
  //}}AFX_VIRTUAL g,q&A$Wi  
  // Implementation 5 &VLq  
 protected: KQ2]VN"?_  
  HICON m_hIcon; PmTA3aH  
  // Generated message map functions 0ogTQ`2Z:  
  //{{AFX_MSG(CCaptureDlg) ~+|p.(I  
  virtual BOOL OnInitDialog(); x JepDCUJ>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $A-b-`X  
  afx_msg void OnPaint(); Dui<$jl0b  
  afx_msg HCURSOR OnQueryDragIcon(); 3c ^_IuW-  
  virtual void OnCancel(); {Ji[d.cY  
  afx_msg void OnAbout(); `zTVup&  
  afx_msg void OnBrowse();  _@HMk"A  
  afx_msg void OnChange(); K!'9wt  
 //}}AFX_MSG 6T)D6;@L  
 DECLARE_MESSAGE_MAP() _El=M0  
}; x0 j$]$  
#endif N7[i443a  
Dn9Ta}miTO  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file iHR?]]RF  
#include "stdafx.h" M~^|dR)D  
#include "Capture.h" iJ#sg+  
#include "CaptureDlg.h"  /y1,w JI  
#include <windowsx.h> 5Rc 5/m  
#pragma comment(lib,"hook.lib") uWgY+T  
#ifdef _DEBUG "&>$/b$  
#define new DEBUG_NEW (m@({  
#undef THIS_FILE OI1&Z4Lx  
static char THIS_FILE[] = __FILE__; eH75: `  
#endif obY5taOw  
#define IDM_SHELL WM_USER+1 ,%D \  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yht_*7.lM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ``0knr <  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; nI dvff  
class CAboutDlg : public CDialog %e=BC^VW  
{ Ey 4GyAl  
 public: F4KXx^~o  
  CAboutDlg(); m+,a=sR  
  // Dialog Data !,|yrB&`S  
  //{{AFX_DATA(CAboutDlg) PT|t6V"wd  
  enum { IDD = IDD_ABOUTBOX }; YJF!_kg.  
  //}}AFX_DATA U^:+J-z{  
  // ClassWizard generated virtual function overrides ]B\H  
  //{{AFX_VIRTUAL(CAboutDlg) O57 eq.aT  
 protected: 1Hk`i%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /+iU1m'(  
  //}}AFX_VIRTUAL &*A7{76x  
  // Implementation ]qvrpI!E!  
 protected: vm 1vX;  
  //{{AFX_MSG(CAboutDlg) SW# 5px`  
  //}}AFX_MSG E2+O-;VN  
  DECLARE_MESSAGE_MAP() 'z>|N{-xG  
}; w+z~Mz}Vz  
r3{Cuz  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) DTH;d-Z  
{ p0>W}+8fF  
 //{{AFX_DATA_INIT(CAboutDlg) =0 mf  
 //}}AFX_DATA_INIT fH}#.vy  
} ,l1A]Wx  
{ ZrIA+eH  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XE6sFU  
{ !EB<e5}8wK  
 CDialog::DoDataExchange(pDX); F^fL  
 //{{AFX_DATA_MAP(CAboutDlg) *QH@c3vUe\  
 //}}AFX_DATA_MAP $~W =)f9  
} Nb(c;|nV  
`O/1aW1  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *6IytW OX5  
 //{{AFX_MSG_MAP(CAboutDlg) IT!u4iH[  
 // No message handlers Utd`T+AF*  
 //}}AFX_MSG_MAP avxr|uk  
END_MESSAGE_MAP() td@I ;d2  
' d' Dlg  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (_1(<Jw  
: CDialog(CCaptureDlg::IDD, pParent) (#KSwWo{ed  
{ gc,%A'OR^<  
 //{{AFX_DATA_INIT(CCaptureDlg) J[ ;g \  
  m_bControl = FALSE; 8~* |muN.e  
  m_bAlt = FALSE;  -]n\|U<  
  m_bShift = FALSE; K@U[x,Sx  
  m_Path = _T("c:\\"); GO4IAUA  
  m_Number = _T("0 picture captured."); eO%w i.Q  
  nCount=0;  %JoHc?  
  bRegistered=FALSE; 5NGQWg  
  bTray=FALSE; 5y^I~"_ i  
 //}}AFX_DATA_INIT e\)r"!?H`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9 n0 ?0mk  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); W2>VgMR [  
} l;7T.2J'Z  
E>_N|j)9  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) uSQlE=  
{ 12]rfd   
 CDialog::DoDataExchange(pDX); ly9tI-E  
 //{{AFX_DATA_MAP(CCaptureDlg) /qaWUUf  
  DDX_Control(pDX, IDC_KEY, m_Key); +,c]FAx4  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _|jEuif  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 5FMe&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ^tF lA)  
  DDX_Text(pDX, IDC_PATH, m_Path); h[ cqa  
  DDX_Text(pDX, IDC_NUMBER, m_Number); GAP,$xAaW  
 //}}AFX_DATA_MAP .~ O- <P#  
} mswAao<y&x  
dD351!-  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !-HJ%(5:F  
//{{AFX_MSG_MAP(CCaptureDlg) ls({{34NF  
 ON_WM_SYSCOMMAND() :P8X?C63W]  
 ON_WM_PAINT() X<sM4dwxE  
 ON_WM_QUERYDRAGICON() Yr)<1.K4,M  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2`^M OGYk  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) V7<w9MM  
 ON_BN_CLICKED(ID_CHANGE, OnChange) )tm%0z7R  
//}}AFX_MSG_MAP JA09 o(  
END_MESSAGE_MAP() S'(IG m4  
laRn![[  
BOOL CCaptureDlg::OnInitDialog() A'aYH`j  
{ H krhd   
 CDialog::OnInitDialog(); De ([fC  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); LGh#  
 ASSERT(IDM_ABOUTBOX < 0xF000); C1==a FD  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Df@b;-E  
 if (pSysMenu != NULL) 7q&T2?GEN  
 { ,`!>.E.  
  CString strAboutMenu; /H*[~b   
  strAboutMenu.LoadString(IDS_ABOUTBOX); {nMCU{*k  
  if (!strAboutMenu.IsEmpty()) LJSx~)@  
  {  c?*x2Vk  
   pSysMenu->AppendMenu(MF_SEPARATOR); ,(B/R8ZF~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #y8Esik  
  } =5O&4G`}  
 } N C3XJ 4  
 SetIcon(m_hIcon, TRUE); // Set big icon -amNz.`[PR  
 SetIcon(m_hIcon, FALSE); // Set small icon &,QBJx<#  
 m_Key.SetCurSel(0); z s\N)LyM  
 RegisterHotkey(); 7O~hA*Z  
 CMenu* pMenu=GetSystemMenu(FALSE); =)%~QK {Y  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); J u"/#@  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :j[=   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); l'1_Fb  
 return TRUE; // return TRUE unless you set the focus to a control 3F9dr@I.7  
} 5 Nt9'"  
UW Px|]RC  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ?NxaJ^  
{ ]4Q~x  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) #iT3 aou  
 { _4LDzVjNRe  
  CAboutDlg dlgAbout; c3)6{  
  dlgAbout.DoModal(); @=?#nB&  
 } 8#|PJc  
 else "d*-k R  
 { G)gPL]C0  
  CDialog::OnSysCommand(nID, lParam); ,IPryI   
 } ;m"R.Q9*  
} NkxW*w%}l  
C}71SlN'M  
void CCaptureDlg::OnPaint() A<-3u  
{ rW2l+:@c  
 if (IsIconic()) iwfH~  
 { 'kekJ.wJ;  
  CPaintDC dc(this); // device context for painting }q)dXFL=I#  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +L pMNnl6  
  // Center icon in client rectangle KS;Wr6]@(O  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7Pr5`#x#  
  int cyIcon = GetSystemMetrics(SM_CYICON); N#^o,/  
  CRect rect; "9,+m$nj  
  GetClientRect(&rect); > M4QEv  
  int x = (rect.Width() - cxIcon + 1) / 2; @}tk/7-E  
  int y = (rect.Height() - cyIcon + 1) / 2; mam(h{f$  
  // Draw the icon )z7+%nTO  
  dc.DrawIcon(x, y, m_hIcon); 0*:4@go0}i  
 } Gx-tPW}  
 else #+;0=6+SM  
 { }#E~XlX^  
  CDialog::OnPaint(); SA.,Q~_T7  
 } 7;NvR4P%  
} tH9BC5+r}  
v H vwH  
HCURSOR CCaptureDlg::OnQueryDragIcon() FhMl+Ou  
{ yQ+C}8r5  
 return (HCURSOR) m_hIcon; K[i|OZWu  
} ysQ8==`38i  
pAd SOR2  
void CCaptureDlg::OnCancel() 1 =9 Kwd  
{ \"mL LnK?  
 if(bTray) Z#062NL "  
  DeleteIcon(); 0V?:5r<  
  CDialog::OnCancel(); }P"JP[#E\  
} b+mh9q'5E  
T\o!^|8  
void CCaptureDlg::OnAbout() =j!Ruy1  
{ xZ(VvINL'  
 CAboutDlg dlg; UP |#WegO  
 dlg.DoModal(); @|J+ f5O  
} OcGHMGdn  
[)83X\CO  
void CCaptureDlg::OnBrowse() U^{'"x+  
{ 7= x]p  
 CString str; +BE_K_56  
 BROWSEINFO bi; 6z80Y*|eJ  
 char name[MAX_PATH]; QH_I<Y:n  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 6s|4'!  
 bi.hwndOwner=GetSafeHwnd(); B0}f,J\  
 bi.pszDisplayName=name;  *$o{+YP  
 bi.lpszTitle="Select folder"; Um9]X@z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 5KFd/9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); |lhVk\X  
 if(idl==NULL) G' 'l,\3  
  return; _o-D},f*e  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); W g2Y`2@t  
 str.ReleaseBuffer(); 0qrsf!  
 m_Path=str; -w:F8k ~  
 if(str.GetAt(str.GetLength()-1)!='\\') )R`w{V  
  m_Path+="\\"; S<V__Sv  
 UpdateData(FALSE); 2v6QUf  
} Ge]2g0  
) b vZ~t+^  
void CCaptureDlg::SaveBmp() +\a`:QET  
{ UR&Uwa&.  
 CDC dc; A+lP]Oy0S  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); yprf `D>  
 CBitmap bm; /Ma"a ^  
 int Width=GetSystemMetrics(SM_CXSCREEN); ,HFoy-Yq  
 int Height=GetSystemMetrics(SM_CYSCREEN); `2@t) :  
 bm.CreateCompatibleBitmap(&dc,Width,Height); t<6`?\Gk  
 CDC tdc; wcT0XXh  
 tdc.CreateCompatibleDC(&dc); :+SpZ>  
 CBitmap*pOld=tdc.SelectObject(&bm); `_6!nk q8  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9 1r"-%(r  
 tdc.SelectObject(pOld); Ta38/v;S  
 BITMAP btm; ;@@1$mzK  
 bm.GetBitmap(&btm); bX:ARe O  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; >~5>)yN_a1  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 1YA_`_@w  
 BITMAPINFOHEADER bih; &Oq& ikw  
 bih.biBitCount=btm.bmBitsPixel; ~$N%UQn?b#  
 bih.biClrImportant=0; c D+IMlT  
 bih.biClrUsed=0; wyk4v}  
 bih.biCompression=0; %:/_O*~)Yg  
 bih.biHeight=btm.bmHeight; Syn>;FX  
 bih.biPlanes=1; l("Dw8 H  
 bih.biSize=sizeof(BITMAPINFOHEADER); $e;_N4d^  
 bih.biSizeImage=size; (L?fYSP!  
 bih.biWidth=btm.bmWidth; /! kKL$j  
 bih.biXPelsPerMeter=0; )POuH*j  
 bih.biYPelsPerMeter=0; oY:6a  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +'H_sMmi{  
 static int filecount=0;  t]Xdzy  
 CString name; dlC)&Ai  
 name.Format("pict%04d.bmp",filecount++); ?L$ Dk5-W  
 name=m_Path+name; U3 e3  
 BITMAPFILEHEADER bfh; .N99=%[}h  
 bfh.bfReserved1=bfh.bfReserved2=0; Z@=1-l  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Gw*n,*pz  
 bfh.bfSize=54+size; Da!A1|"  
 bfh.bfOffBits=54; d_&R>GmR$  
 CFile bf; :luVsQ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5Cd>p<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); tm~V+t!mj  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #J]u3*T n|  
  bf.WriteHuge(lpData,size); 5B!l6ST  
  bf.Close(); }u&.n pc  
  nCount++; udDhJ?  
 } wAxXK94#3  
 GlobalFreePtr(lpData); .N8AkQ(Ok  
 if(nCount==1) mxhO: .l  
  m_Number.Format("%d picture captured.",nCount); {Q[{H'Oa  
 else S*6P=O*  
  m_Number.Format("%d pictures captured.",nCount); b w!;ZRK  
  UpdateData(FALSE); RV5X0  
} <8p53*a  
8/*q#j  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) QF(.fq8, U  
{ !CROc}  
 if(pMsg -> message == WM_KEYDOWN) 5Ya TE<G  
 { ]S4kWq{Y  
  if(pMsg -> wParam == VK_ESCAPE) ~k?7XF I  
   return TRUE; C)`k{(-{  
  if(pMsg -> wParam == VK_RETURN) Fd-PjW/E8  
   return TRUE; F0%FX`b{{  
 } @.T '>;izr  
 return CDialog::PreTranslateMessage(pMsg); ziR}  
} \5 IB/ *  
^ElUU?rX  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;1&%Wj"d  
{ D\]gIXg  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [f}YXQ0N)  
  SaveBmp(); X>j% y7v  
  return FALSE; |GtTz&  
} <Yu}7klJE  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ T>s~bIzL*e  
 CMenu pop; Ub*Gv(Pg  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); b[Sd$ACd  
 CMenu*pMenu=pop.GetSubMenu(0); BRbx.  
 pMenu->SetDefaultItem(ID_EXITICON); V #W,}+_Sz  
 CPoint pt; Lt0JUUa0  
 GetCursorPos(&pt); U7O~ch[,  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); DVt;I$  
 if(id==ID_EXITICON) XRCiv  
  DeleteIcon(); ZIQy}b'  
 else if(id==ID_EXIT) ^%V'l-}/  
  OnCancel(); 3JM0 m (  
 return FALSE; H=[eO  
} I}Uj"m`>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %719h>$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) x zu)``?  
 AddIcon(); 2apR7  
 return res; z[X>>P3<n  
} Ahk6{uz  
<QFT>#@T  
void CCaptureDlg::AddIcon() Z .VIb|  
{ &^Q-:Kxs8  
 NOTIFYICONDATA data; 9`Bmop  
 data.cbSize=sizeof(NOTIFYICONDATA); OAO|HH  
 CString tip; , f{<  
 tip.LoadString(IDS_ICONTIP); 3:Q5dr+1_  
 data.hIcon=GetIcon(0); :UM>`Y  
 data.hWnd=GetSafeHwnd(); P*Va<'{:{  
 strcpy(data.szTip,tip); ]:jP*0bLx  
 data.uCallbackMessage=IDM_SHELL; ^N#B( F  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  |`[0U  
 data.uID=98; ?aOx b  
 Shell_NotifyIcon(NIM_ADD,&data); =i[_C>U  
 ShowWindow(SW_HIDE); K8M[xaI@  
 bTray=TRUE; TG 9 a1q  
} wb~B Y  
3y?I^ .B  
void CCaptureDlg::DeleteIcon() OP0KK^#  
{ l#u$w&  
 NOTIFYICONDATA data; DCr&%)Ll  
 data.cbSize=sizeof(NOTIFYICONDATA); @=JOAo  
 data.hWnd=GetSafeHwnd(); KBJ%$OQV  
 data.uID=98; MJ"ug8 N  
 Shell_NotifyIcon(NIM_DELETE,&data); Ahl-EVIr<  
 ShowWindow(SW_SHOW); :}(Aq;}X  
 SetForegroundWindow(); T40&a(hXQ  
 ShowWindow(SW_SHOWNORMAL); ZLm?8g6-  
 bTray=FALSE; QS(aA*D  
} !YX$4_I  
iY@wg 8ry  
void CCaptureDlg::OnChange() iQs^2z#Bd  
{ #o`y<1rN  
 RegisterHotkey(); {jdtNtw  
} Y$JGpeq8w  
8i$quHd&x  
BOOL CCaptureDlg::RegisterHotkey() b,C2(?hg  
{ y,&'nk}  
 UpdateData(); o>4mkh[3  
 UCHAR mask=0; 7\(m n$  
 UCHAR key=0; K|^PHe  
 if(m_bControl) WXq=FZ-  
  mask|=4; {"kE u  
 if(m_bAlt) l$[7 pM[  
  mask|=2; gR5 EK$  
 if(m_bShift) @6["A'h  
  mask|=1; =n@"lY u[  
  key=Key_Table[m_Key.GetCurSel()]; [d"]AF[#  
 if(bRegistered){ #BPJRNXd  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); #3VOC#.  
  bRegistered=FALSE; @ FNaCmBX  
 } -d-vzri  
 cMask=mask; QK~44;LVIJ  
 cKey=key; Y5mQY5u|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 2uSXC*Phz  
 return bRegistered;  ujin+;1  
} 3#\++h]QZ  
D;1?IeS  
  四、小结 >b;o&E`\  
z:Y Z]   
  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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