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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: qE{cCS  
  q8h{-^"  
  一、实现方法 Q'a N|^w"f  
1ZL_;k  
  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: fv_wK_. %:  
GiZ'IDV  
#pragma data_seg("shareddata") /K!,^Xn  
HHOOK hHook =NULL; //钩子句柄 vQ/\BN  
UINT nHookCount =0; //挂接的程序数目 *_QHtZG  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 NNE,| :  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 (7b_g6>:  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey vs@:L)GW\  
static int KeyCount =0; 7:L~n(QpP  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2SJh6U  
#pragma data_seg() U(N$6{i_  
M([H\^\:  
  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。 ~yi&wbTjM  
\!QF9dP4  
  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: =Yj[MVn  
z{g<y^Im+E  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR I7PWO d  
cKey,UCHAR cMask) 5tU"|10m3  
{ L%d?eHF  
 BOOL bAdded=FALSE; 12PE{Mut  
 for(int index=0;index<MAX_KEY;index++){ v,+l xY  
  if(hCallWnd[index]==0){ h<K;VpL6  
   hCallWnd[index]=hWnd; N ]7a=  
   HotKey[index]=cKey; zsXH{atY  
   HotKeyMask[index]=cMask; a1`cI5n  
   bAdded=TRUE; .:ZXtU  
   KeyCount++; &iOtw0E  
   break; Hm* vKFhz  
  } 3K!0 4\  
 } |2<f<k/UT  
 return bAdded; $cOD6Xr)d  
} 1:!rw,Jzl`  
//删除热键 R$fIb}PDr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T+nC>}*jgJ  
{ 0o|,& K  
 BOOL bRemoved=FALSE; _A|\.(t  
 for(int index=0;index<MAX_KEY;index++){ g$"eI/o  
  if(hCallWnd[index]==hWnd){ S.)7u6/_!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ N&ql(#r  
    hCallWnd[index]=NULL; IVzA>Vd  
    HotKey[index]=0; j& o+KV  
    HotKeyMask[index]=0; WJU NJN  
    bRemoved=TRUE; DsW`V~ T  
    KeyCount--; 8Qz7uPq  
    break; RpK,ixbtA+  
   } 7 3z Y^ x  
  } 9H}iX0O  
 } A4Q)YY9~  
 return bRemoved; 6+;2B<II  
} iB3 +KR  
f5b`gvCY,#  
%H}Y]D~R  
  DLL中的钩子函数如下: Mto~ /  
!$xEX,vj|W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) N^yO- xk  
{ KHus/M&0  
 BOOL bProcessed=FALSE; @*"<U]  
 if(HC_ACTION==nCode) /-YlC (kL  
 { /^33 e+j  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 fd"~[ z[  
   switch(wParam) sR>;h /  
   {  4`-?r%$,:  
    case VK_MENU: 31sgf5 s  
     MaskBits&=~ALTBIT; V=4u7!ha  
     break; ;k&k#>L!K  
    case VK_CONTROL: #Wm@&|U  
     MaskBits&=~CTRLBIT; ROt0<^<  
     break; vx5o k1UY  
    case VK_SHIFT: tbzvO<~  
     MaskBits&=~SHIFTBIT; q\b ?o!# _  
     break; YeExjC  
    default: //judge the key and send message ua|Z`qUyq  
     break; fA M4Q  
   } jbhJ;c:  
   for(int index=0;index<MAX_KEY;index++){ 5-5(`OZ{'  
    if(hCallWnd[index]==NULL) 1xdESorX(  
     continue; _IKP{WNB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @j\?h$A/  
    { D@(M+u9/%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ul=a\;3x#|  
     bProcessed=TRUE; ?J@?,rZQ^V  
    } x$5nLS2.  
   } ;*4tVp,  
  } t6%xit+  
  else if((lParam&0xc000ffff)==1){ //有键按下 H=o-ScA  
   switch(wParam) \eMYw7y5 M  
   { E2h;hr;W  
    case VK_MENU: 1[/$ZYk:  
     MaskBits|=ALTBIT; }M9DqZ;I  
     break; :Y J7J4  
    case VK_CONTROL: [mB(GL  
     MaskBits|=CTRLBIT; ,4>WLJDo  
     break; X |1_0  
    case VK_SHIFT: 6KCCbg/  
     MaskBits|=SHIFTBIT; spU!t-n67  
     break; ok>P [ &!  
    default: //judge the key and send message QK3j_'F=E  
     break; ,'1Olu{v[s  
   } l q\'  
   for(int index=0;index<MAX_KEY;index++){ W]!@Zlal  
    if(hCallWnd[index]==NULL) 1Oca@E\Z.  
     continue; cdJ`Gk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "\zj][sL  
    { .i3lG( YG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1IF'>*  
     bProcessed=TRUE; /8WpX  
    } FU (}=5n  
   } K?FX<PT  
  } o! 2 n}C  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 T[4[/n> i  
   for(int index=0;index<MAX_KEY;index++){ ~D -JZx  
    if(hCallWnd[index]==NULL) |>IUtUg\  
     continue; w `. T/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ER;lkF`RF  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); BS-:dyBw  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 N o_$!)J.  
   } PzMlua  
  } /Oq)3fU e  
 } ^EC)~HP@C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); `bZ2x@  
} :tjgg]  
409x!d~it  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: _UH/}!nqB  
2|0Qk&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G.-h=DT]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q:2aPfo&  
GCP{Z]u  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: [xZ/ZWb/  
C-a*EG  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) aDN6MZM  
{ 2,8/Cb  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *l>[`U+  
 { ;T5,T   
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6Q.{llO  
  SaveBmp(); wO2V%v^bp  
  return FALSE; r 1l/) ;  
 } l50|` 6t  
 …… //其它处理及默认处理 08Pt(kzNA  
} ,Lt~u_lve  
D4=..;  
\A'|XdQ  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 /-!&k  
 .6O52E  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 H )BOSZD  
), nCq^Bp  
  二、编程步骤 iA55yT+  
)(:+q(m  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 4 |zdXS  
L;1$xI8tx  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; u%6Irdx  
Z/89&Uy`h  
  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; [K/O5_  
NCowt|#t  
  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; YVQ_tCC_!  
la G$v-r  
  5、 添加代码,编译运行程序。  YBYBOH  
*3A3>Rwu  
三、程序代码 M>*0r<qn  
E;6Y? vJ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ~-XOvKJb  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) YMc8Q\*B  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ g  ,/a6M  
#if _MSC_VER > 1000 D~G5]M,}$  
#pragma once '}U_D:o.b  
#endif // _MSC_VER > 1000 Zdv.PGn  
#ifndef __AFXWIN_H__ u-AWJc+F.  
#error include 'stdafx.h' before including this file for PCH p{iG{  
#endif @k=cN>ZMc  
#include "resource.h" // main symbols D+@-XU<Lp<  
class CHookApp : public CWinApp d&}pgb-Md  
{ =y)p>3p}&  
 public: F^ I\X  
  CHookApp(); 1%$d D2  
  // Overrides &Q\_;  
  // ClassWizard generated virtual function overrides v-P8WFjca  
  //{{AFX_VIRTUAL(CHookApp) 89LpklD  
 public: |ZvNH ~!  
  virtual BOOL InitInstance(); Uj4Lu  
  virtual int ExitInstance(); <Vz<{W3t  
  //}}AFX_VIRTUAL i0k+l  
  //{{AFX_MSG(CHookApp) hnp`s%e,  
  // NOTE - the ClassWizard will add and remove member functions here. 1vB-M6(  
  // DO NOT EDIT what you see in these blocks of generated code ! eq^TA1>T  
  //}}AFX_MSG $7Jfb<y  
  DECLARE_MESSAGE_MAP() nkCecwzr-  
}; Sg-g^ dIN1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ,\BVV,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cU7rq j_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8|1`Tn}o  
BOOL InitHotkey(); 5;X {.2  
BOOL UnInit(); +68+PhHF  
#endif 2{Wo-B,wt~  
UH5w7M  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. EoKC8/  
#include "stdafx.h" ,/i_QgP  
#include "hook.h" k/df(cs  
#include <windowsx.h> :=rA Yc3]  
#ifdef _DEBUG {SF[I  
#define new DEBUG_NEW J&A;#<qY  
#undef THIS_FILE ;*y|8od B  
static char THIS_FILE[] = __FILE__; RXGHD19]  
#endif Vo #:CB=8  
#define MAX_KEY 100 jr9&.8%W:v  
#define CTRLBIT 0x04 LYp'vZ!  
#define ALTBIT 0x02 Nc{]zWL9  
#define SHIFTBIT 0x01 Uh>.v |P6  
#pragma data_seg("shareddata") wb]*u7G t/  
HHOOK hHook =NULL; aGpCNc{+  
UINT nHookCount =0; Ds {{J5Um%  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey i\(\MzW*'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT XR|"dbZW.0  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 3rxo,pX94  
static int KeyCount =0; CXTt(-FT  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift DC&A1I&  
#pragma data_seg() /@Ez" ?V2  
HINSTANCE hins; C1V# ?03eI  
void VerifyWindow(); !tI=`Ml[  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) tC2N >C[N  
//{{AFX_MSG_MAP(CHookApp) c\M#5+1j  
// NOTE - the ClassWizard will add and remove mapping macros here. 4py(R-8\  
// DO NOT EDIT what you see in these blocks of generated code! IQT cYl  
//}}AFX_MSG_MAP wuKl-:S;Vs  
END_MESSAGE_MAP() ;P3>>DZ  
1xz\=HOT  
CHookApp::CHookApp() [_h%F,_ A  
{ PfyRZ[3)c  
 // TODO: add construction code here, fCB:733H  
 // Place all significant initialization in InitInstance "ml?7Xl,n  
} sYI~dU2H  
QjLji +L  
CHookApp theApp; Wdo#?@m  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,E&Bn8L~O  
{ ,~- ?l7  
 BOOL bProcessed=FALSE; v51EXf  
 if(HC_ACTION==nCode) U| 8[#@r  
 { Xt ft*Z  
  if((lParam&0xc0000000)==0xc0000000){// Key up 5^>n5u/  
   switch(wParam) _().t5<  
   { r:-WzH(Ms  
    case VK_MENU: ; yyO0Ha  
     MaskBits&=~ALTBIT; tevQW  
     break; On4w/L9L5  
    case VK_CONTROL: \k;U}Te<  
     MaskBits&=~CTRLBIT; k5a\Sq}  
     break; &Cq{ _M  
    case VK_SHIFT: .!i0_Rv5x  
     MaskBits&=~SHIFTBIT; P<u"97@8a  
     break; 6^sHgYR  
    default: //judge the key and send message e&2wdH&  
     break; @&5A&(  
   } 4b4QbJ$  
   for(int index=0;index<MAX_KEY;index++){ PRD_!VOW  
    if(hCallWnd[index]==NULL) "<*awWNI  
     continue; ?vu_k 'io  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hq?jdNy :  
    { g]|_ `  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @rO4y`  
     bProcessed=TRUE; $M':&i5`,  
    } =MC~GXJSNw  
   } k(vPg,X>m  
  } Zm(dY*z5:J  
  else if((lParam&0xc000ffff)==1){ //Key down L,~MicgV  
   switch(wParam) ^uW%v2  
   { uUG*0Lj  
    case VK_MENU: Wr>(#*r7q  
     MaskBits|=ALTBIT; pCC7(Ouo  
     break; 4 \p -TPM  
    case VK_CONTROL: x l0DN{PG  
     MaskBits|=CTRLBIT; aX^+ O,  
     break; jJ~Y]dQi  
    case VK_SHIFT: zE`R,:VI  
     MaskBits|=SHIFTBIT; ;xK_qBIP  
     break; /)9W1U^B  
    default: //judge the key and send message Kd3QqVJBz1  
     break; :Q_x/+-  
   } {B0h+. C  
   for(int index=0;index<MAX_KEY;index++) nJJs% @y  
   { cXN _*%  
    if(hCallWnd[index]==NULL) .+E#q&=  
     continue; dig~J\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) K;U39ofW  
    { kX[fy7rVt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); We}lx{E  
     bProcessed=TRUE; Z^zbWFO]5  
    } ]` ]g@v  
   } =Ikg.jYq&F  
  } frN3S  
  if(!bProcessed){ Km3&N  
   for(int index=0;index<MAX_KEY;index++){ NP/>H9Q2%  
    if(hCallWnd[index]==NULL) zoP%u,XL  
     continue; @Z;1 g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :EZQ'3X  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ++8_fgM  
   } lJ{V  
  } 1$ML#5+,  
 } mJC3@V s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); PJgp+u<  
} 6:?rlh  
)"`!AerJ  
BOOL InitHotkey() ~|l IC !q  
{ kIvvEh<L=  
 if(hHook!=NULL){ gUVn;_  
  nHookCount++; +l?; )  
  return TRUE; 9`"DFFSMS  
 } 0 mexF@  
 else '{ f=hE_/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); e*]r  
  if(hHook!=NULL) jtKn3m7 +p  
   nHookCount++; :gI.l1  
  return (hHook!=NULL); 8LJ{i%  
} !@g)10u  
BOOL UnInit() &|5GB3H =  
{ },c,30V'  
 if(nHookCount>1){ # |^^K!%  
  nHookCount--; Cd]/  
  return TRUE; h qmSE'8  
 } [s` G^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |}[nH>  
 if(unhooked==TRUE){ |dmh  
  nHookCount=0; v27Ja .tA  
  hHook=NULL; 7@~tVxB;  
 } %f&< wC  
 return unhooked; .Q&rfH3  
} I,O#X)O|i  
:0 ^s0l  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5j^NV&/_  
{ V 0{tap}  
 BOOL bAdded=FALSE; w([$@1]  
 for(int index=0;index<MAX_KEY;index++){ lBA+zZ  
  if(hCallWnd[index]==0){ NY.k.  
   hCallWnd[index]=hWnd; <]G${y*;  
   HotKey[index]=cKey; t FgX\4  
   HotKeyMask[index]=cMask; n56;m`IU  
   bAdded=TRUE; o a<q/  
   KeyCount++; "T6#  
   break; J]pa4C`  
  } ULBg {e?l8  
 } UQT'6* !  
 return bAdded; .q;ED`G  
} Hl7:*]l7b  
0ys~2Y!eH  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1 W'F3  
{ oq;'eM1,.  
 BOOL bRemoved=FALSE; ftZj}|R!  
 for(int index=0;index<MAX_KEY;index++){ @Doyt{|T  
  if(hCallWnd[index]==hWnd){ .T.5TMiOSq  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ NZXjE$<Vr  
    hCallWnd[index]=NULL; Lz4eh WntO  
    HotKey[index]=0; Bw< rp-  
    HotKeyMask[index]=0; Z1,gtl ?  
    bRemoved=TRUE; Hs0pW5oZ  
    KeyCount--; >q7 %UK]&  
    break; &ak6zM  
   } gPEqjj  
  } y,m2(V  
 } H{fM%*w  
 return bRemoved; 6)*xU|fU  
} 8_we: 9A  
(P@Y36j>N  
void VerifyWindow() or?%-)  
{ X K>&$<5{  
 for(int i=0;i<MAX_KEY;i++){ t\R; < x  
  if(hCallWnd!=NULL){ RiFw?Q+  
   if(!IsWindow(hCallWnd)){ TbhH&kG)1  
    hCallWnd=NULL; ;+Y i.Q/\  
    HotKey=0; MagMZR  
    HotKeyMask=0; G?hK9@ |v  
    KeyCount--; g+[kde;(^  
   } kv?|'DN  
  } -{g~TUz  
 } <GIwRVCU  
} ``QHG&$ /  
83iCL;GS=  
BOOL CHookApp::InitInstance() cFZCf8:zB  
{ `  2%6V)s  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ,x_Z JL  
 hins=AfxGetInstanceHandle(); K"{HseN{  
 InitHotkey(); RKkGITDk  
 return CWinApp::InitInstance(); ^toAw8A=@0  
} :FQ1[X1 xm  
pY}/j;.[  
int CHookApp::ExitInstance() U;^[$Aq  
{ )0CQP  
 VerifyWindow(); H;KDZO9W  
 UnInit(); 1dG06<!  
 return CWinApp::ExitInstance(); Z<z;L<tJ 9  
} hWEnn=BW  
H{`{)mS  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $k 2)8#\  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) [*Ju3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ dcq#TBo8  
#if _MSC_VER > 1000 Q~,YbZ-7  
#pragma once hR)2xz  
#endif // _MSC_VER > 1000 jBtj+ TL8  
UpUp8%fCU  
class CCaptureDlg : public CDialog >bm|%Ou"  
{  Ewo~9 4{  
 // Construction 1]OSWCEm*[  
 public: UuJjO^t  
  BOOL bTray; *^XbDg9  
  BOOL bRegistered; (GU9p>2  
  BOOL RegisterHotkey(); lAASV{s{  
  UCHAR cKey; %w"nDu2Gcv  
  UCHAR cMask; ae`|ic  
  void DeleteIcon(); UQ8bN I7  
  void AddIcon(); Omyt2`q  
  UINT nCount; IF_DZ   
  void SaveBmp(); \7 a4uc  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor J)x3\[}Ye  
  // Dialog Data c{3rl;Cs  
  //{{AFX_DATA(CCaptureDlg) s: |M].  
  enum { IDD = IDD_CAPTURE_DIALOG }; y!Cc?$]_Y  
  CComboBox m_Key; ^^?q$1k6r*  
  BOOL m_bControl; l},NcPL`  
  BOOL m_bAlt; gA^q^>7  
  BOOL m_bShift; 8b&uU [  
  CString m_Path; 8 %Sb+w07  
  CString m_Number; Y& {|Sw7?  
  //}}AFX_DATA ,E*R,'w   
  // ClassWizard generated virtual function overrides le .'pP@  
  //{{AFX_VIRTUAL(CCaptureDlg) k`YYZt]@  
 public: ]n v( aM?d  
  virtual BOOL PreTranslateMessage(MSG* pMsg); tS?lB05TOR  
 protected: d/U."V}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support p+w8$8)  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); T[uDZYx  
  //}}AFX_VIRTUAL O.+9,4A(  
  // Implementation igkz2SI  
 protected: M7dU@Ag  
  HICON m_hIcon; i@$*Csj\9*  
  // Generated message map functions _" N\b%CkO  
  //{{AFX_MSG(CCaptureDlg) !`wW_W  
  virtual BOOL OnInitDialog(); Faac]5u:*  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); v,1F-- v  
  afx_msg void OnPaint(); $ |<m9CW  
  afx_msg HCURSOR OnQueryDragIcon(); >S#ul?  
  virtual void OnCancel();  tFh|V pB  
  afx_msg void OnAbout(); a39hP*  
  afx_msg void OnBrowse(); \V%_hl  
  afx_msg void OnChange(); 's%q  
 //}}AFX_MSG CEtR[Cu  
 DECLARE_MESSAGE_MAP() 0D [@u3W  
}; By((,QpB  
#endif q-AN[_@  
$k0H9_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file c@du2ICUc  
#include "stdafx.h" 3N4.$#>#9@  
#include "Capture.h" ([k7hUP  
#include "CaptureDlg.h" 3LK%1+)4  
#include <windowsx.h> N6/T#UVns  
#pragma comment(lib,"hook.lib") 8jnz}aBd  
#ifdef _DEBUG !1 :@8q  
#define new DEBUG_NEW w]!0<  
#undef THIS_FILE R}{GwbF_\  
static char THIS_FILE[] = __FILE__; 0i@:KYP  
#endif > <Z'D  
#define IDM_SHELL WM_USER+1 %xlpB75N4N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1y[B[\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); HOPqxI(k  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <^><3U`  
class CAboutDlg : public CDialog bLS&H[f K  
{ Wmz`&nsn[  
 public: Fdt}..H%  
  CAboutDlg(); )"u:ytK{  
  // Dialog Data V2 `> ]/|  
  //{{AFX_DATA(CAboutDlg) n9oR)&:o  
  enum { IDD = IDD_ABOUTBOX }; '044Vm;/  
  //}}AFX_DATA ]PS\#I}  
  // ClassWizard generated virtual function overrides  (_+;R  
  //{{AFX_VIRTUAL(CAboutDlg) &8?`<   
 protected: Spj9H?m  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kQIw/@WC  
  //}}AFX_VIRTUAL IN!02`H  
  // Implementation OyVm(%Z   
 protected: b X,Siz:F  
  //{{AFX_MSG(CAboutDlg) l)|lTOjb  
  //}}AFX_MSG >&K!VQ{g  
  DECLARE_MESSAGE_MAP() 5h^[^*A?  
}; ti_u!kNv  
bkv/I{C>?  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \ TL82H@D  
{ k0ItG?Cv  
 //{{AFX_DATA_INIT(CAboutDlg) '2v f|CX  
 //}}AFX_DATA_INIT !v>ew9  
} #A<"4#}  
/lH'hcXcX  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) T.Zz;2I  
{ n0fRu`SNV  
 CDialog::DoDataExchange(pDX); JAP (|  
 //{{AFX_DATA_MAP(CAboutDlg) jD9lz-Y@  
 //}}AFX_DATA_MAP uxDLDA$;  
} a$}6:E  
|uUuFm  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) i21QJ6jPcI  
 //{{AFX_MSG_MAP(CAboutDlg) \E hr@g  
 // No message handlers Yj8&  
 //}}AFX_MSG_MAP dY'Y5Th~  
END_MESSAGE_MAP() JvJ;bFXD  
Q[_Ni15  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Eo=HNe  
: CDialog(CCaptureDlg::IDD, pParent) o# {#r@,i  
{ kL;t8{n  
 //{{AFX_DATA_INIT(CCaptureDlg) {ymb\$f  
  m_bControl = FALSE; r{ @ `o@q  
  m_bAlt = FALSE; (%DRt4u <H  
  m_bShift = FALSE; HdCk!Fv  
  m_Path = _T("c:\\"); !0jq6[&  
  m_Number = _T("0 picture captured."); n;OHH{E{  
  nCount=0; A{`]& K1u  
  bRegistered=FALSE; 6>B \|  
  bTray=FALSE; fPz=KoN  
 //}}AFX_DATA_INIT `:5,e/5,  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4#2 ,Y!  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); yq6LH   
} uUS)#qM |  
n\>.T[$"  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) l1RlYl5  
{ pqfT\Kb>  
 CDialog::DoDataExchange(pDX); FsY`nWwg  
 //{{AFX_DATA_MAP(CCaptureDlg) @:gl:mc  
  DDX_Control(pDX, IDC_KEY, m_Key); e "_"vbk  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); (Y;'[.  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ]h8/M7k  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); J/7 u7_  
  DDX_Text(pDX, IDC_PATH, m_Path); "1%*'B^}bw  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Xz* tbW#  
 //}}AFX_DATA_MAP Ar5JP_M`E  
} $4h04_"  
V8v,jS$l4  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) M6x;BjrV  
//{{AFX_MSG_MAP(CCaptureDlg) yu_gNro L  
 ON_WM_SYSCOMMAND() /cY[at|p  
 ON_WM_PAINT() )$F6  
 ON_WM_QUERYDRAGICON() Z@nmjji  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 05g?jV  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) B>aEH b  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #tP )-ww  
//}}AFX_MSG_MAP !Iko0#4i  
END_MESSAGE_MAP() 6\mC$:F  
c8\g"T  
BOOL CCaptureDlg::OnInitDialog() b)y<.pS\  
{ |{!Ns+'  
 CDialog::OnInitDialog(); o HRbAE^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8fEAYRGd  
 ASSERT(IDM_ABOUTBOX < 0xF000); c0hdLl;5  
 CMenu* pSysMenu = GetSystemMenu(FALSE); JrxP,[qJG  
 if (pSysMenu != NULL) N$ *>suQ,  
 { 4SBLu%=s%  
  CString strAboutMenu; Qv=Bq{N  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?e2Y`0  
  if (!strAboutMenu.IsEmpty()) 7t+]z)  
  { lDH_ Y]bM  
   pSysMenu->AppendMenu(MF_SEPARATOR); E =  ^-Z  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); n('VQ0b  
  } ;<~j)8  
 } m9cj7  
 SetIcon(m_hIcon, TRUE); // Set big icon ;pCG9  
 SetIcon(m_hIcon, FALSE); // Set small icon fl!1AKSn@N  
 m_Key.SetCurSel(0); :.C)7( 8S  
 RegisterHotkey(); "rf\' 9=  
 CMenu* pMenu=GetSystemMenu(FALSE); GMyoSe%1/  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {AtfK>D  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); su%Z{f)#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _"`uqW79  
 return TRUE; // return TRUE unless you set the focus to a control H8x:D3C0  
} 1=- X<M75  
ap{{(y&R  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) tTE3H_   
{ wfWS-pQ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) vLD:(qTi  
 { 0L 7@2|a0  
  CAboutDlg dlgAbout; t2m  ^  
  dlgAbout.DoModal(); s+Cl  
 } b^;N>zx  
 else }v,W-gA  
 { yqC+P  
  CDialog::OnSysCommand(nID, lParam); ~F=#}6kg_  
 } Ds;Rb6WcnY  
} uk`d,xF   
/XbY<pj  
void CCaptureDlg::OnPaint() EgCp:L{  
{ hE9'F(87a  
 if (IsIconic()) b^@`uDb6  
 { cRjL3  
  CPaintDC dc(this); // device context for painting !~Ax  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);  |UABar b  
  // Center icon in client rectangle av7q>NEZ!1  
  int cxIcon = GetSystemMetrics(SM_CXICON); Vl&+/-V  
  int cyIcon = GetSystemMetrics(SM_CYICON); 'aLPTVM^  
  CRect rect; 01UqDdoj  
  GetClientRect(&rect); 1Qrm"TFo  
  int x = (rect.Width() - cxIcon + 1) / 2; +D6-m  
  int y = (rect.Height() - cyIcon + 1) / 2; (4E.Li<O  
  // Draw the icon 2OA8 R}  
  dc.DrawIcon(x, y, m_hIcon); Y!Usce  
 } (0O`A~M3  
 else R4[. n@  
 { MM/BJ  
  CDialog::OnPaint(); vK[v eFH  
 } tP/GDC;  
} cob9hj#&7  
K[`4vsE  
HCURSOR CCaptureDlg::OnQueryDragIcon() {^2({A#&  
{ 4UkP:Vz:  
 return (HCURSOR) m_hIcon; ?Aj\1y4L1  
} ]J GKL5~p  
IiYuUN1D  
void CCaptureDlg::OnCancel() j&o/X7I=  
{ =<Zwv\U  
 if(bTray) >MBn2(\B;  
  DeleteIcon(); uKaf{=*  
  CDialog::OnCancel(); 7H/! rx  
} rHA/  
v3iDh8.__  
void CCaptureDlg::OnAbout() (UbR%A|v;  
{ Q-H =wJ4R  
 CAboutDlg dlg; tr#)iZ\  
 dlg.DoModal(); ;D %5 nnr  
} [)T$91 6I  
:*^(OnIe  
void CCaptureDlg::OnBrowse() i2`.#YJ&v  
{ R.^Bxi-UG:  
 CString str; ;+aDjO2(  
 BROWSEINFO bi; \xa36~hh40  
 char name[MAX_PATH]; ,.1&Ff)S  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); S5YDS|K  
 bi.hwndOwner=GetSafeHwnd(); A`+(VzZgJ  
 bi.pszDisplayName=name; 0KNH=;d}  
 bi.lpszTitle="Select folder"; Sm~? zU[k/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; WVBE>TB  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 64IeCAMVo  
 if(idl==NULL) }V93~>  
  return; XPR:_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [:/7OM  
 str.ReleaseBuffer(); a78;\{&L'  
 m_Path=str; &@`H^8  
 if(str.GetAt(str.GetLength()-1)!='\\') 3P=Eb!qtdD  
  m_Path+="\\"; ba8-XA_~U  
 UpdateData(FALSE); =1uj1.h  
} qHcY 2LV  
q? gQ  
void CCaptureDlg::SaveBmp() *NX*/(Q  
{ *$*nY [/5  
 CDC dc; iq[2H$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #lLn='4  
 CBitmap bm; 4Tbi%vF{  
 int Width=GetSystemMetrics(SM_CXSCREEN); q=j/s4~  
 int Height=GetSystemMetrics(SM_CYSCREEN); SWe!9Y$  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 7,&3=R <  
 CDC tdc; z}Mb4{d1  
 tdc.CreateCompatibleDC(&dc); '/ ]fZ|  
 CBitmap*pOld=tdc.SelectObject(&bm); !X#3w-K  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); PgGrk5;  
 tdc.SelectObject(pOld); e!L sc3@  
 BITMAP btm; )PLc+J.I  
 bm.GetBitmap(&btm); l[x`*+ON:2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 2t Z\{=  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7J)Hwl  
 BITMAPINFOHEADER bih; %\s#e  
 bih.biBitCount=btm.bmBitsPixel; tjc5>T[Es8  
 bih.biClrImportant=0; 0B!mEg  
 bih.biClrUsed=0; ;Wp`th!F  
 bih.biCompression=0; e[|p0 ,Q  
 bih.biHeight=btm.bmHeight; s$3eJ|  
 bih.biPlanes=1; AyI}LQm]u  
 bih.biSize=sizeof(BITMAPINFOHEADER); V< 9em7  
 bih.biSizeImage=size; O!@KM;  
 bih.biWidth=btm.bmWidth; Td=] tVM  
 bih.biXPelsPerMeter=0; 6A{s%v H  
 bih.biYPelsPerMeter=0; R4K eUn"  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _4x[}e7KF  
 static int filecount=0; ^b/q|(Nu&  
 CString name; h<z/LL8|  
 name.Format("pict%04d.bmp",filecount++); LTlC}3c28f  
 name=m_Path+name; RQ$o'U9A  
 BITMAPFILEHEADER bfh; -`ys pE0?  
 bfh.bfReserved1=bfh.bfReserved2=0; FKvO7? K  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ZLFdnC@  
 bfh.bfSize=54+size; cJp1 <R  
 bfh.bfOffBits=54; Dv\:b*  
 CFile bf; 1.cUol nr  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ lhvZ*[[<)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); jP{]LJ2.6\  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); <:_]Yl  
  bf.WriteHuge(lpData,size); DIcyXZH<  
  bf.Close(); *U[Q=w  
  nCount++; p|O-I&Xd  
 } !h~#L"z  
 GlobalFreePtr(lpData); VIlQzM;%^  
 if(nCount==1) )jQe K  
  m_Number.Format("%d picture captured.",nCount); 4s+J-l  
 else / hj9Q!  
  m_Number.Format("%d pictures captured.",nCount); KE|u}M@v6  
  UpdateData(FALSE); 2>_LX!kyP]  
} n4 6PQm%p  
.4m3@!qo)E  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )]e d;V  
{ 5|B(K @<  
 if(pMsg -> message == WM_KEYDOWN) 2 ShlYW@~  
 { ~bm2_/RL  
  if(pMsg -> wParam == VK_ESCAPE) &4$43\(D  
   return TRUE; `^4>^  
  if(pMsg -> wParam == VK_RETURN) nm%4L  
   return TRUE; H]n0JG9K  
 } vpr @  
 return CDialog::PreTranslateMessage(pMsg); Ga/\kO)x_  
} '_yk_[/  
e+=G-u5}-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) RBp(dKxM$w  
{ :!*;0~#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ uu46'aT  
  SaveBmp(); yl]Cm?8  
  return FALSE; tS.b5$Q  
} 0 6v5/Xf  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ o\V4qekk  
 CMenu pop; Gpp}Jpj   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 22(]x}`  
 CMenu*pMenu=pop.GetSubMenu(0); ~a0}  
 pMenu->SetDefaultItem(ID_EXITICON); .$E~.6J %i  
 CPoint pt; 8 $*cfOC  
 GetCursorPos(&pt); TKs@?Q,J  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); VBj;2~Xj4h  
 if(id==ID_EXITICON) K &~#@I;  
  DeleteIcon(); }n&JZ`8<s  
 else if(id==ID_EXIT) 1*`JcUn,>  
  OnCancel(); #z54/T  
 return FALSE; KcyM2hE7  
} u$`x]K=Zsm  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Mm[1Z;H  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |\L,r}1N  
 AddIcon(); w"Y55EURB  
 return res; ng)yCa_Ny  
} [g 68O*  
K#pt8Q  
void CCaptureDlg::AddIcon() %!/liS  
{ $TW+LWb   
 NOTIFYICONDATA data; G&@RLht  
 data.cbSize=sizeof(NOTIFYICONDATA); vh{1u  
 CString tip; b(rBha|  
 tip.LoadString(IDS_ICONTIP); *gMP_I  
 data.hIcon=GetIcon(0); j`-y"6)  
 data.hWnd=GetSafeHwnd(); |^9ig_k`  
 strcpy(data.szTip,tip); !urd $Ta  
 data.uCallbackMessage=IDM_SHELL; [tw<TV"\  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4 Fc1 '  
 data.uID=98; tf}Q%)`f  
 Shell_NotifyIcon(NIM_ADD,&data); :zy'hu;  
 ShowWindow(SW_HIDE); thboHPml{  
 bTray=TRUE; vT<wd#  
} U=1`. Ove  
`U>b6 {K  
void CCaptureDlg::DeleteIcon() ,OFr]74\  
{ Vy*Z"k  
 NOTIFYICONDATA data; K OHH74}_  
 data.cbSize=sizeof(NOTIFYICONDATA); s 17gi,"X  
 data.hWnd=GetSafeHwnd(); +?g,&NE  
 data.uID=98; \}Kp=8@nE  
 Shell_NotifyIcon(NIM_DELETE,&data);  l e/#J  
 ShowWindow(SW_SHOW); ?d`+vHK]>  
 SetForegroundWindow(); /M c"K  
 ShowWindow(SW_SHOWNORMAL); ~G^doj3|+  
 bTray=FALSE; F[giq 1#  
} D`@U[`Sw  
g<5Pc,  
void CCaptureDlg::OnChange() #AnSjl  
{ *LQY6=H  
 RegisterHotkey(); ?mUu(D:7D  
} ">^]^wa08  
>~8Df61o`  
BOOL CCaptureDlg::RegisterHotkey() b4OR`dd*J  
{ 31\^9w__8  
 UpdateData(); gMMd=  
 UCHAR mask=0; @+vTGjHA  
 UCHAR key=0; Kt7x'5  
 if(m_bControl) Ln -?/[E  
  mask|=4; ~ab_+%  
 if(m_bAlt) 9 3I9`!e  
  mask|=2; $?Mz[X  
 if(m_bShift) LjAIB(*  
  mask|=1; 85~h+Q;  
  key=Key_Table[m_Key.GetCurSel()]; =_:L wmI  
 if(bRegistered){ 7VBw@Rh  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); HcUz2Rm5XP  
  bRegistered=FALSE; < tq9  
 } -k{R<L  
 cMask=mask; W5uI(rS<6  
 cKey=key; lfG's'U-z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); />7/S^  
 return bRegistered; 2= mD  
} vw6FvE`lC  
muq|^Hfb  
  四、小结 @S:/6__  
nx]b\A  
  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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