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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: Jr*S2 z<*  
  }i/2XmA )  
  一、实现方法 ^|hRu{Q W  
KTAe~y  
  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: %NAFU /&  
X6"^:)&1M  
#pragma data_seg("shareddata") yADN_  
HHOOK hHook =NULL; //钩子句柄 (fI&(";t  
UINT nHookCount =0; //挂接的程序数目 p'w"V6k('~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 U!-+v:SF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 "3>*i!i  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3I{ta/(  
static int KeyCount =0; )su <Ji*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 P.H/H04+  
#pragma data_seg() TF iM[  
*~lgU4  
  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。 )DZ-vnZ#t0  
?3E_KGI  
  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: ^J}$y7  
~m;MM)_V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR +68K[s,FD  
cKey,UCHAR cMask) ~)_ ?:.Da  
{ "!_ 4%z-  
 BOOL bAdded=FALSE; 94k)a8-!  
 for(int index=0;index<MAX_KEY;index++){ '|A5a+[  
  if(hCallWnd[index]==0){ xvz5\s|b  
   hCallWnd[index]=hWnd; ; K 6Fe)  
   HotKey[index]=cKey; {ALBmSapK"  
   HotKeyMask[index]=cMask; A%czhF  
   bAdded=TRUE; meVVRFQ2+  
   KeyCount++; QmkC~kK1.  
   break; >7Sl( UY-  
  } 6+f>XL#w  
 } 'rq#q)1MT  
 return bAdded; E{]|jPdr  
} "VVR#H}{  
//删除热键 ,IZxlf%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) gBiQIhz  
{ r(2'0JQ  
 BOOL bRemoved=FALSE; [#*?uu+ jK  
 for(int index=0;index<MAX_KEY;index++){ V1fvQ=9  
  if(hCallWnd[index]==hWnd){ +}L3T"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~1]2A[`s!  
    hCallWnd[index]=NULL; x_iy;\s1  
    HotKey[index]=0; 5\kZgXWIh  
    HotKeyMask[index]=0; bZlLivi  
    bRemoved=TRUE; 1S.e5{  
    KeyCount--; "drh+oo.  
    break; 0gb]Kjx  
   } j{w,<Wt>  
  } eYX_V6c  
 } $^D(%  
 return bRemoved; (>5VS  
} Jc#)T;# 6  
*Wo$ $T  
/E  yg*#  
  DLL中的钩子函数如下: 2WECQl=r  
_x|8U'|Ce  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sluZ-,zE  
{ j[Zni D  
 BOOL bProcessed=FALSE; [ *a>{sO[  
 if(HC_ACTION==nCode) }br<2?y,  
 { o/[yA3^  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 8\V>6^3CD$  
   switch(wParam) e]B<\i\T  
   {  'e)ze^Jq  
    case VK_MENU: _wJ#jJz2  
     MaskBits&=~ALTBIT; y#Sw>-zRq  
     break; 0B:{4Lsn&  
    case VK_CONTROL: r ~!%w(N|M  
     MaskBits&=~CTRLBIT; pmD-]0  
     break; gx9sBkoq5D  
    case VK_SHIFT: *]| JX&  
     MaskBits&=~SHIFTBIT; GvtI-\h]  
     break; V5@[7ncVf  
    default: //judge the key and send message <l s/3!  
     break; >W]"a3E  
   } Iybpk?,M+  
   for(int index=0;index<MAX_KEY;index++){ nu%Nt"~[%  
    if(hCallWnd[index]==NULL) e`2R{H  
     continue; -V_S4|>   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F*( A; N_y  
    { pC. 4AkEO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H_f2:Za  
     bProcessed=TRUE; <WKz,jh  
    } dv}R]f'  
   } O|TwG:!  
  } ;Kb[UZ1  
  else if((lParam&0xc000ffff)==1){ //有键按下 $>s@T(  
   switch(wParam) G`lhvpifG  
   { Z q>.;>  
    case VK_MENU: _$_CR\$  
     MaskBits|=ALTBIT; FT<*  
     break; v%~ViOgL\  
    case VK_CONTROL: |nZB/YZt  
     MaskBits|=CTRLBIT; 5*za]   
     break; MC)W?  
    case VK_SHIFT: J0mCWtx&  
     MaskBits|=SHIFTBIT; n.UM+2G  
     break; >#n-4NZ;p9  
    default: //judge the key and send message OxGCpbh*7o  
     break; G:ngio]G0  
   } Z5a@fWU  
   for(int index=0;index<MAX_KEY;index++){ 1% %Tm"  
    if(hCallWnd[index]==NULL) 7Bd_/A($  
     continue; kL2sJX+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nln[V$   
    { HZ4 ^T7G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _7H J'  
     bProcessed=TRUE; OiEaVPSI;  
    } )g^Ewzy^X  
   } ly5L-=Xb  
  } l hp:.  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $ rnr;V  
   for(int index=0;index<MAX_KEY;index++){ zV Li  
    if(hCallWnd[index]==NULL) Y6;9j=[  
     continue; :>ST)Y@]w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) < io8 b|A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %= ;K>D  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *!s?hHv  
   } /[dAgxL  
  } ):EXh#  
 } E004"E<E  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $^ dk>Hj>4  
} / hdl  
rX}==`#\  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: J0bs$  
Yaepy3F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); CPM6T$_qE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3? CpylCO  
nW*Oo|p~=  
  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: zb)SlR  
HD|)D5wH|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4c@F.I  
{ X1D:{S[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) X_8NW,  
 { <"%h1{V  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 %4K#<b"W  
  SaveBmp(); #T`+~tW'|  
  return FALSE; j" .6  
 } [+7X&B  
 …… //其它处理及默认处理 [kkcV5I-  
} y~1php>2f1  
M<pgaB0  
gq &85([  
  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。 DTVnQC  
XKIJ6M~5k  
  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。 DdBr Jx  
>G7U7R}R  
  二、编程步骤 S6Pb V}  
;H|M)z#[Z  
  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"; 5LH ]B  
>9|+F [Fc  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; )Q?[_<1Y+  
lI<8)42yq  
  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; kO"aE~  
-e\56%\~_  
  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; Vk T3_f  
f#b[KB^Z,2  
  5、 添加代码,编译运行程序。 G dY^}TJrh  
"S#hzrEdYI  
三、程序代码 z H4#\d  
7J/3O[2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL A*;h}\n  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) m q9&To!  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ V@f#/"u'  
#if _MSC_VER > 1000 P .(X]+  
#pragma once Us.jyg7_c  
#endif // _MSC_VER > 1000 @S):a`J  
#ifndef __AFXWIN_H__ <Ux;dekz}  
#error include 'stdafx.h' before including this file for PCH :gv#_[k  
#endif ,r4af<  
#include "resource.h" // main symbols a@1gMZc*  
class CHookApp : public CWinApp aQ\O ]gCE  
{ \C|06Bs $  
 public: zf#&3K'k  
  CHookApp(); r6G)R+#  
  // Overrides 4{E=wg^p  
  // ClassWizard generated virtual function overrides IQ8AsV&'C  
  //{{AFX_VIRTUAL(CHookApp) Vtri"G8 aB  
 public: (#k#0T kE  
  virtual BOOL InitInstance(); d a9 *>+[  
  virtual int ExitInstance(); TUr}p aw_  
  //}}AFX_VIRTUAL fsu "Lc  
  //{{AFX_MSG(CHookApp) j]^]p; An  
  // NOTE - the ClassWizard will add and remove member functions here. p(%x&*)f  
  // DO NOT EDIT what you see in these blocks of generated code ! U"Oq85vY  
  //}}AFX_MSG :wm^04<i   
  DECLARE_MESSAGE_MAP() 0T;WN$W|  
}; &Y$rVBgQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); dI|/Xm>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); d0 az#Yg!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); AQZ\Kcr  
BOOL InitHotkey(); s<]l[Y>  
BOOL UnInit(); "'(4l 2.  
#endif P]GGnT(!  
MvFXVCT#  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. RR|Eqm3)  
#include "stdafx.h" i|Wn*~yFOO  
#include "hook.h" RJM(+5xQ|  
#include <windowsx.h> /2 N%Z  
#ifdef _DEBUG L_|Y_=r."  
#define new DEBUG_NEW C54)eT6  
#undef THIS_FILE _u; UU$~  
static char THIS_FILE[] = __FILE__; B%/Pn 2  
#endif \Qn8"I83AV  
#define MAX_KEY 100 P2kZi=0  
#define CTRLBIT 0x04 MiRB*eA  
#define ALTBIT 0x02 lvlH5Fc  
#define SHIFTBIT 0x01 &$[{L)D  
#pragma data_seg("shareddata") P@#6.Bb#V  
HHOOK hHook =NULL; oGZ9@Y)(T  
UINT nHookCount =0; DS fKUx&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =%p{ " <  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Ycwb1e#  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey sYzG_* )  
static int KeyCount =0; &V L<Rx  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift }{"\"Bn_  
#pragma data_seg() `shB[Lt  
HINSTANCE hins; ;z#9>99rH  
void VerifyWindow(); {JJ`|*H$_  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ~S9nLb:O{  
//{{AFX_MSG_MAP(CHookApp) x4K5  
// NOTE - the ClassWizard will add and remove mapping macros here. FKP^f\!M  
// DO NOT EDIT what you see in these blocks of generated code! 8}"j#tDc  
//}}AFX_MSG_MAP )d~Mag+  
END_MESSAGE_MAP() 5I14"Qf  
$.kYAsZts  
CHookApp::CHookApp() Yu=^`I  
{ {ig@Iy~DT  
 // TODO: add construction code here, 03PVbDq-  
 // Place all significant initialization in InitInstance =Ao;[j)*!  
} TH-^tw  
qCMcN<:>  
CHookApp theApp; IP3-lru  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yY+2;`CH  
{ 6dh PqL  
 BOOL bProcessed=FALSE; 7blZAA?-  
 if(HC_ACTION==nCode) *HRRv.iQ  
 { T>?~eYHXs  
  if((lParam&0xc0000000)==0xc0000000){// Key up ?#'qY6 ^  
   switch(wParam) WBGYk);  
   { k)J7) L  
    case VK_MENU: ?g&]*zc^\  
     MaskBits&=~ALTBIT; {SJLM0=Z  
     break; |w5#a_adM  
    case VK_CONTROL: <}=D?bXw  
     MaskBits&=~CTRLBIT; h$!qb'|  
     break; vR,'':  
    case VK_SHIFT: fjb2-K  
     MaskBits&=~SHIFTBIT; )UeG2dXx7  
     break; 5^k#fl2  
    default: //judge the key and send message 9fiZ5\  
     break; yQ}~ aA#h  
   } &P;x<7h$t?  
   for(int index=0;index<MAX_KEY;index++){ VXa]L4jJ9  
    if(hCallWnd[index]==NULL) 1#V0g Q  
     continue; eIO}/npT]Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \?o%<c5{  
    { ">o/\sXeH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :X#(T- !t  
     bProcessed=TRUE; E_OLf%um  
    } x[X.// :  
   } xfzR>NU  
  } u0,~pJvX  
  else if((lParam&0xc000ffff)==1){ //Key down gOkO8P6P8  
   switch(wParam) 1;h>^NOq  
   { l @Ki`if  
    case VK_MENU: P+/L, u  
     MaskBits|=ALTBIT; gSC@uf  
     break; P/_XDP./U  
    case VK_CONTROL: d09GD[5  
     MaskBits|=CTRLBIT; xqr`T0!&  
     break; Kk,->q<1  
    case VK_SHIFT: 9T]]TEv4  
     MaskBits|=SHIFTBIT; +0OQ"2^&  
     break; {`'b+0[;@  
    default: //judge the key and send message sk5\"jna  
     break; rk~/^(!  
   } ^Iz.O  
   for(int index=0;index<MAX_KEY;index++) }X UHP%  
   { ..!yf e"5  
    if(hCallWnd[index]==NULL) ?z6C8T~+  
     continue; ]8^2(^3ct  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) XEuv aM  
    { OV[-m;h|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Zwc b5\Q  
     bProcessed=TRUE; 0K!9MDT}*  
    } g/E;OcFaO  
   } >eXNw}_j  
  } 23>?3-q  
  if(!bProcessed){ B[$e;h*Aw[  
   for(int index=0;index<MAX_KEY;index++){ MLDuo|?  
    if(hCallWnd[index]==NULL) ldxUq,p  
     continue; ]mc,FlhU@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) P$Dr6;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); qHj4`&  
   } U t%ie=c  
  } H0Tt(:.&  
 } vD(;VeW[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); lyV]-w  
} dU\fC{1Z  
sqy5rug  
BOOL InitHotkey() RPrk]<<1  
{ o 2DnkzpJ  
 if(hHook!=NULL){ L+u_153  
  nHookCount++; #y?z2 !  
  return TRUE; 1^,rS  
 } ZpdM[\Q-  
 else ] =D+a&  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); acH.L _B:  
  if(hHook!=NULL) w8E,zH  
   nHookCount++; 9> |rIw  
  return (hHook!=NULL); E )PEKWK\  
} ^O ?$} sr  
BOOL UnInit() 5t PmrWZ  
{ $&4Zw6"=  
 if(nHookCount>1){ ; R67a V,  
  nHookCount--; 0QPipuP  
  return TRUE; o%dtf5}(,  
 } >ko;CQR  
 BOOL unhooked = UnhookWindowsHookEx(hHook); /i]Gg \)  
 if(unhooked==TRUE){ eI[z%j[Y*  
  nHookCount=0; Yc %eTh  
  hHook=NULL; v|hi;l@7E  
 } *f[`Yv  
 return unhooked; K@fxCj*}  
} DJbj@ 2W[  
koUH>J:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g5cR.]oz  
{ OS!47Z /q  
 BOOL bAdded=FALSE; 7fVVU+y  
 for(int index=0;index<MAX_KEY;index++){ 0+L5k!1D  
  if(hCallWnd[index]==0){ Y 8P  
   hCallWnd[index]=hWnd; +EFur dX\  
   HotKey[index]=cKey; 9uq| VU5  
   HotKeyMask[index]=cMask; t;*'p  
   bAdded=TRUE; mF_/Rhu  
   KeyCount++; [ -%oO  
   break; ^yX W.s  
  } \&cVcA g  
 } 3B_S>0H"$  
 return bAdded; 1rN&Y,61\  
} O`2%@%?I  
rg $71Ir  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {c$W-t):U|  
{ )S`A+M K]  
 BOOL bRemoved=FALSE; M_PL{  
 for(int index=0;index<MAX_KEY;index++){ a{HvrWs?Q  
  if(hCallWnd[index]==hWnd){ u_uC78`p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )I*V('R6|  
    hCallWnd[index]=NULL; 86I".R$d  
    HotKey[index]=0; I[R?j?$}>  
    HotKeyMask[index]=0; E{FNsa  
    bRemoved=TRUE; 'Hq}h)`  
    KeyCount--; gK PV*  
    break; ?6[>HX;  
   } { u;ntDr  
  } 3(CUC  
 } ^awl-CG  
 return bRemoved; f5O*Njl  
} Z8:iaP)  
^RY_j>i  
void VerifyWindow() UgUW4x'+  
{ lKm?Xu'yH  
 for(int i=0;i<MAX_KEY;i++){ osnDW aN  
  if(hCallWnd!=NULL){ 8>w/Es5  
   if(!IsWindow(hCallWnd)){ KJ-D|N,8@^  
    hCallWnd=NULL; :>cJ[K?0  
    HotKey=0; 'al-C;Z  
    HotKeyMask=0; `W-:@?PmQx  
    KeyCount--; HezCRtxRcc  
   } |~>8]3. Y  
  } c,+oH<bZZs  
 } `T mIrc  
} %Jw;c`JM  
& MAIm56~  
BOOL CHookApp::InitInstance() iA:CPBv_mu  
{ H kg0;)  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); W}EO]A%f.\  
 hins=AfxGetInstanceHandle(); $1w8GI\J  
 InitHotkey(); Z{e5 OJ  
 return CWinApp::InitInstance(); 'SuYNA)  
} 7`P(LQAr!  
&)wQ|{P~k  
int CHookApp::ExitInstance() I5-/K VWb  
{ C[[z3tn  
 VerifyWindow(); ;z&p(e  
 UnInit(); 6#.R'O  
 return CWinApp::ExitInstance(); `; `34t_)  
} Hiq9Jn uv(  
yJr'\(  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file SX;FBO(p  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :@pm gp  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ s(zG.7*3n  
#if _MSC_VER > 1000 ]ao]?=q C  
#pragma once \ii^F?+b  
#endif // _MSC_VER > 1000 x*_c'\F|  
)EO$JwQ  
class CCaptureDlg : public CDialog z`/v}'d[X  
{ ysSEgC3  
 // Construction ;KnnAZJ  
 public: <8H`y(S  
  BOOL bTray; [jafPi(#g  
  BOOL bRegistered; c|I{U[(U  
  BOOL RegisterHotkey(); xOS4J+'s@  
  UCHAR cKey; V+E2nJ  
  UCHAR cMask; ost~<4~  
  void DeleteIcon(); |vGz 1jLV  
  void AddIcon(); >SccoI  
  UINT nCount; jtd{=[STU  
  void SaveBmp(); \n/_ Px  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor br0gB3 r  
  // Dialog Data {lqnn n3  
  //{{AFX_DATA(CCaptureDlg) g6nBu  
  enum { IDD = IDD_CAPTURE_DIALOG }; mvYr"6f8  
  CComboBox m_Key; Iy"   
  BOOL m_bControl; y\ouIsI77  
  BOOL m_bAlt; TG'A'wXxy  
  BOOL m_bShift; f\Pd#$3  
  CString m_Path; Rh: \/31~  
  CString m_Number; tdEu4)6  
  //}}AFX_DATA Mq6"7L  
  // ClassWizard generated virtual function overrides ~uV.jh  
  //{{AFX_VIRTUAL(CCaptureDlg) YKj7~yK?  
 public: u YJ6 "j  
  virtual BOOL PreTranslateMessage(MSG* pMsg); dGZVWEaPfx  
 protected: 'os-+m@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support i1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); P hn&hRAO  
  //}}AFX_VIRTUAL +8v!vuO'  
  // Implementation ][D<J0  
 protected: ZJd1Lx   
  HICON m_hIcon; *-g S u  
  // Generated message map functions +   
  //{{AFX_MSG(CCaptureDlg) _4.fT  
  virtual BOOL OnInitDialog(); _ 57m] ;&  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Y]ZOvA5W  
  afx_msg void OnPaint(); tR*J M$T  
  afx_msg HCURSOR OnQueryDragIcon(); fNQ.FAK":  
  virtual void OnCancel(); fU$zG"a_  
  afx_msg void OnAbout(); xpUaFb  
  afx_msg void OnBrowse(); HHT K{X+  
  afx_msg void OnChange(); rW!P~yk  
 //}}AFX_MSG , Lhgv1  
 DECLARE_MESSAGE_MAP() Rh,*tS  
}; MX  qH  
#endif sexnO^s  
YW}1Mf=_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file z[V|W  
#include "stdafx.h" .LdLm991,Y  
#include "Capture.h" t[7YMk  
#include "CaptureDlg.h" O[Nc$dc  
#include <windowsx.h> k4s >sd3 5  
#pragma comment(lib,"hook.lib") NNSn]LP  
#ifdef _DEBUG o9>r -  
#define new DEBUG_NEW ~[l2"@  
#undef THIS_FILE G^oBu^bq~  
static char THIS_FILE[] = __FILE__; BpRQG]L  
#endif fXO"Mr1  
#define IDM_SHELL WM_USER+1 irpO(>LK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fok OjTE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6?z&G6  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 91`biVZfA  
class CAboutDlg : public CDialog .-fJ\`^mi  
{ k$# @_  
 public: TRG"fVR  
  CAboutDlg(); GIt; Y  
  // Dialog Data Rm"lRkY4I[  
  //{{AFX_DATA(CAboutDlg) 'V .4Nhd  
  enum { IDD = IDD_ABOUTBOX }; Spt[b.4mF  
  //}}AFX_DATA ^[lg1uMW  
  // ClassWizard generated virtual function overrides _q M'm^z5  
  //{{AFX_VIRTUAL(CAboutDlg) ;?bRRW  
 protected: pn>zuH e  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pT:CvJ  
  //}}AFX_VIRTUAL Yw4c`MyL  
  // Implementation {WT"\Xj>B?  
 protected: >\%44ba6  
  //{{AFX_MSG(CAboutDlg) -7hU1j~I  
  //}}AFX_MSG <HI5xB_  
  DECLARE_MESSAGE_MAP() I3p ~pt2  
}; 6D@tCmmq  
,NPU0IDG>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) " #_NA`$i  
{ K4snp u hC  
 //{{AFX_DATA_INIT(CAboutDlg) GAEz :n  
 //}}AFX_DATA_INIT ~1i,R1_\Y  
} _~fO8_vr  
+u:8#!X$RD  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "pQM$3n(  
{ I Yj\t?,0  
 CDialog::DoDataExchange(pDX); (Sv7^}j  
 //{{AFX_DATA_MAP(CAboutDlg) !G Z2|~f9  
 //}}AFX_DATA_MAP R84 g<  
} 2-. g>'W  
}mk9-7  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) !nC Z,  
 //{{AFX_MSG_MAP(CAboutDlg) B$_F)2%m;  
 // No message handlers l&^9<th  
 //}}AFX_MSG_MAP wnN@aO6g*  
END_MESSAGE_MAP() ]Y}faW(&Y  
+);o{wfW  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ) yRC$7I  
: CDialog(CCaptureDlg::IDD, pParent) [P`Q_L,+  
{ Yk6fr~b  
 //{{AFX_DATA_INIT(CCaptureDlg) 's(0>i  
  m_bControl = FALSE; <~<I K=n  
  m_bAlt = FALSE; aG?'F`UQ  
  m_bShift = FALSE; ;xXHSxa:=W  
  m_Path = _T("c:\\"); b8feo'4Z   
  m_Number = _T("0 picture captured."); 2p8JqZMQb  
  nCount=0; G]=U=9ZI  
  bRegistered=FALSE; 6P3ezl@#;  
  bTray=FALSE; rKP"|+^  
 //}}AFX_DATA_INIT 2P"@=bYT"  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 x.<^L] "  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (S =::ODU  
} #sq-V,8  
w[n|Sauy,  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 3T|:1Nw  
{ 6WzE'0Nyr  
 CDialog::DoDataExchange(pDX); VgN`' iC`I  
 //{{AFX_DATA_MAP(CCaptureDlg) #}^ZxEU  
  DDX_Control(pDX, IDC_KEY, m_Key); T<mk98CdE  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); K &Ht37T  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 4ehajK  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &:nWZ!D  
  DDX_Text(pDX, IDC_PATH, m_Path); n)8bkcZCp+  
  DDX_Text(pDX, IDC_NUMBER, m_Number); -P!vCf^{ t  
 //}}AFX_DATA_MAP 2sk^A ly  
} Cx} Yp-  
b=Zg1SqV  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 4qrPAt  
//{{AFX_MSG_MAP(CCaptureDlg) kZWc(LwA  
 ON_WM_SYSCOMMAND() L/c$p`-  
 ON_WM_PAINT() ~2S`y=*:  
 ON_WM_QUERYDRAGICON() rPZ<  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) YEF%l'm( \  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) DOw< XlvC  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Ddghw(9*H  
//}}AFX_MSG_MAP f]0kG  
END_MESSAGE_MAP() 9c}LG5  
);@@>~  
BOOL CCaptureDlg::OnInitDialog() LyS139P$  
{ POtDge  
 CDialog::OnInitDialog(); Z=L' [6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 49@ pA-  
 ASSERT(IDM_ABOUTBOX < 0xF000); t'Nu^_#  
 CMenu* pSysMenu = GetSystemMenu(FALSE); |0b$60m$!t  
 if (pSysMenu != NULL) GQ$0`?lp  
 { aGr(djD  
  CString strAboutMenu; (t&P. N/  
  strAboutMenu.LoadString(IDS_ABOUTBOX); T=ox;r  
  if (!strAboutMenu.IsEmpty()) +7|Oy3s  
  { BO#fzq%  
   pSysMenu->AppendMenu(MF_SEPARATOR); CDO _A\  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); MV e5j+8  
  } IhJ _Yed  
 } v7\~OOoH]  
 SetIcon(m_hIcon, TRUE); // Set big icon 3Nsb@0  
 SetIcon(m_hIcon, FALSE); // Set small icon Ni(D[?mZ  
 m_Key.SetCurSel(0); K}1>n2P  
 RegisterHotkey(); tPDV"Md#m<  
 CMenu* pMenu=GetSystemMenu(FALSE); !Z<GUbl t  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); svU107?  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +O*S>0  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); i5(_.1X<#{  
 return TRUE; // return TRUE unless you set the focus to a control t8U)za  
} TEE$1RxV(  
RCND|X  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Njc3X@4=  
{ YM1tP'4j@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) aCMF[ 3j  
 { =3a`NO5!  
  CAboutDlg dlgAbout; o//N"S.)  
  dlgAbout.DoModal(); kVe^g]F  
 } s><RL]+{G+  
 else +7sdQCO(Co  
 { &julw;E  
  CDialog::OnSysCommand(nID, lParam); V<\:iNXX{  
 } b0rC\^x  
} A:cc @ku  
z }R-J/xr2  
void CCaptureDlg::OnPaint() VrQw;-rQ  
{ W a2V Z  
 if (IsIconic()) $kZ,uvKN  
 { :kOLiko!4>  
  CPaintDC dc(this); // device context for painting oMkB!s  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?Xlmt$Jp  
  // Center icon in client rectangle rw ^^12)  
  int cxIcon = GetSystemMetrics(SM_CXICON); :>Z0Kb}7  
  int cyIcon = GetSystemMetrics(SM_CYICON); qV/"30,K  
  CRect rect; *xkbKkm  
  GetClientRect(&rect); N{q5E,}  
  int x = (rect.Width() - cxIcon + 1) / 2; '"GdO;}&  
  int y = (rect.Height() - cyIcon + 1) / 2; 6:330"9  
  // Draw the icon 0 -=onX  
  dc.DrawIcon(x, y, m_hIcon); CImB,AXS  
 } A^3cP, L  
 else [\@!~F{  
 { \7$m[h {l  
  CDialog::OnPaint(); b1\z&IdC  
 } QEQ8gfN9>  
} Kcsje_I-M  
/fBZRdB  
HCURSOR CCaptureDlg::OnQueryDragIcon() wI#rAx7f-  
{ (x&#>5  
 return (HCURSOR) m_hIcon; 9/~m837x  
} ^Ac0#oX]M  
IN , @  
void CCaptureDlg::OnCancel() X.j#??  
{ zc*qmb  
 if(bTray) 0aQNdi)b  
  DeleteIcon(); a_x$I? ,  
  CDialog::OnCancel(); I]~xs0$4#  
} m&Ms[X  
qWw@6VvoQ  
void CCaptureDlg::OnAbout() "h2;65@  
{ `i f*   
 CAboutDlg dlg; n!ea)+^  
 dlg.DoModal(); t{F6+dp  
} Dr7,>Yx  
v;JY;Uh|  
void CCaptureDlg::OnBrowse() m-, '  
{ tE(x8>5A:  
 CString str; E 7;KG^  
 BROWSEINFO bi; :}+U?8/"7  
 char name[MAX_PATH]; 31w?bx !Pp  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); yc_(L-'n  
 bi.hwndOwner=GetSafeHwnd(); Y0&w;P  
 bi.pszDisplayName=name; HR['y9 U  
 bi.lpszTitle="Select folder"; qf4|!UR{  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; PM[6U#  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); e7]IEBbX2O  
 if(idl==NULL) {Y` 0}  
  return; rya4sxCh  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); s^L\hr  
 str.ReleaseBuffer(); Sn7.KYS  
 m_Path=str; Wj8\~B=('  
 if(str.GetAt(str.GetLength()-1)!='\\') B&-;w_K  
  m_Path+="\\"; D 67H56[  
 UpdateData(FALSE); ?#,\,  
} 4y>G6TD^  
'9$xOrv  
void CCaptureDlg::SaveBmp() wUh'1D<(r  
{ qe`W~a9x  
 CDC dc; cvn,&G -`  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); |n01T_Z)P  
 CBitmap bm; ?uk|x!Ko]  
 int Width=GetSystemMetrics(SM_CXSCREEN); b]hRmW  
 int Height=GetSystemMetrics(SM_CYSCREEN); =1VY/sv  
 bm.CreateCompatibleBitmap(&dc,Width,Height); SDA +XnmH  
 CDC tdc; hYb!RRGn  
 tdc.CreateCompatibleDC(&dc); /bt@HFL|`  
 CBitmap*pOld=tdc.SelectObject(&bm); %QwMB`x  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); } ..}]J;To  
 tdc.SelectObject(pOld); _ky!4^B  
 BITMAP btm; 0kmVP~K  
 bm.GetBitmap(&btm); ~4XJ" d3L  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; sJ3HH0e  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Q1buuF#CU&  
 BITMAPINFOHEADER bih; <:q]t6]$  
 bih.biBitCount=btm.bmBitsPixel; JOenVepQ,  
 bih.biClrImportant=0; J5@_OIc1y  
 bih.biClrUsed=0; mEyZ<U9  
 bih.biCompression=0; N<$ uAns  
 bih.biHeight=btm.bmHeight; UCvMW*gs  
 bih.biPlanes=1; *AZC{jP  
 bih.biSize=sizeof(BITMAPINFOHEADER); bL swq  
 bih.biSizeImage=size; 34s:|w6y  
 bih.biWidth=btm.bmWidth; wz073-v>ZV  
 bih.biXPelsPerMeter=0; }I05&/o.3p  
 bih.biYPelsPerMeter=0; \W/c C'  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +es.V /  
 static int filecount=0; V%o:Qa[a  
 CString name; c9r2kc3cy{  
 name.Format("pict%04d.bmp",filecount++); WXO@oZ!  
 name=m_Path+name; > { fX;l  
 BITMAPFILEHEADER bfh; mR8&9]g&  
 bfh.bfReserved1=bfh.bfReserved2=0; # ?}WQP!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 3o"~_l$z  
 bfh.bfSize=54+size; R%7k<1d'`  
 bfh.bfOffBits=54; 8I@= ?  
 CFile bf; MJ}VNv|S  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ,^AkfOY7"  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (Q#A Br8  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 89'nbg  
  bf.WriteHuge(lpData,size); M#F;eK2pf  
  bf.Close(); h7gH4L!'u  
  nCount++; ;M@ /AAZ  
 } 5:^dyF&sm{  
 GlobalFreePtr(lpData); MFE~bU(h  
 if(nCount==1) ec"L*l"  
  m_Number.Format("%d picture captured.",nCount); vERsrg;(  
 else ?=Ma7 y  
  m_Number.Format("%d pictures captured.",nCount); "b-6kM  
  UpdateData(FALSE); R:^GNra;  
} l}:9)nXA{  
~[ve?51  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) cJi5\<b  
{ //V?rs  
 if(pMsg -> message == WM_KEYDOWN) (nvSB}?  
 { G^)|c<'M  
  if(pMsg -> wParam == VK_ESCAPE) J~n{gT<L  
   return TRUE; 'T+3tGCy+  
  if(pMsg -> wParam == VK_RETURN) P(A%z2Ql  
   return TRUE; NrS1y"#d9  
 } 3YA !2  
 return CDialog::PreTranslateMessage(pMsg); urXM}^  
} ?\ho9nyK  
|W\CV0L2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Vj~R6   
{ I-fs*yzj;8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ zx;x@";p  
  SaveBmp(); d:<{!}BR3  
  return FALSE; ~w4aA<2Uq  
} 9at7$Nq  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ . +.Y`0  
 CMenu pop; N:"E%:wSbi  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qC`"<R=GX  
 CMenu*pMenu=pop.GetSubMenu(0); 3ywBq9FGhp  
 pMenu->SetDefaultItem(ID_EXITICON); E hd*  
 CPoint pt; X Uh)z  
 GetCursorPos(&pt); O6k[1C  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {[)J~kC+  
 if(id==ID_EXITICON) 9I^_n+E  
  DeleteIcon(); ];zi3oS^  
 else if(id==ID_EXIT) )h>Cp,|{  
  OnCancel(); [x-Z)Q. 5  
 return FALSE; -$[=AqJXp;  
} "+saI@G  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); .o.@cLdU  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) jf.ikxm  
 AddIcon(); D@O '8  
 return res; 8l;0)`PU  
} ;'2y6"\Y  
s^3t18m&1  
void CCaptureDlg::AddIcon() o` ,&yq.  
{ f>Bcr9]]  
 NOTIFYICONDATA data; {*>$LlL  
 data.cbSize=sizeof(NOTIFYICONDATA); YR~g&E#U^  
 CString tip; %Cb8vYz~  
 tip.LoadString(IDS_ICONTIP);  :jB(!XH  
 data.hIcon=GetIcon(0); s+Ln>c'|o  
 data.hWnd=GetSafeHwnd(); -D{~7&  
 strcpy(data.szTip,tip); 1`B5pcuI  
 data.uCallbackMessage=IDM_SHELL; z\fD}`^8  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; dtm_~r7~  
 data.uID=98; <NT/+>:2  
 Shell_NotifyIcon(NIM_ADD,&data); }_5z(7}3  
 ShowWindow(SW_HIDE); Oh<Z0M)  
 bTray=TRUE; *R1x^t+)  
} '2:Ily,S@  
V,|9$A;  
void CCaptureDlg::DeleteIcon() ,| xG2G6  
{ jVk|(  
 NOTIFYICONDATA data; |K/#2y~  
 data.cbSize=sizeof(NOTIFYICONDATA); o.}^6.h"  
 data.hWnd=GetSafeHwnd(); U{eC^yjt"o  
 data.uID=98; klJDYFX=HK  
 Shell_NotifyIcon(NIM_DELETE,&data); |w /txn8G|  
 ShowWindow(SW_SHOW); cGOE$nL  
 SetForegroundWindow(); b LSI\  
 ShowWindow(SW_SHOWNORMAL); Jg;Hg[  
 bTray=FALSE; k= nfo-h  
} My_fm?n  
.yg"!X  
void CCaptureDlg::OnChange() ,MOB+i(3*u  
{ |FPx8b;#  
 RegisterHotkey(); 2tn%/gf'm  
} BQ_\8Qt|  
R!}B^DVt  
BOOL CCaptureDlg::RegisterHotkey() uyjZmT/-  
{ YJeZ{Wws  
 UpdateData(); 6sB!m|zm]:  
 UCHAR mask=0; .B#Lt,m  
 UCHAR key=0; "%A[%7LY  
 if(m_bControl) 3]xnKb|W  
  mask|=4; +=u*!6S  
 if(m_bAlt) eQ9{J9)?  
  mask|=2; br$!}7#=L  
 if(m_bShift) ^Fb"Is#S,  
  mask|=1; cr,o<  
  key=Key_Table[m_Key.GetCurSel()]; E3NYUHfZ  
 if(bRegistered){ (IJf2  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); f&^Ea-c  
  bRegistered=FALSE; Y k~ i.p  
 } |[k6X=5  
 cMask=mask; X]  Tb4  
 cKey=key; _mXq]r0  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); =CRaMjN  
 return bRegistered; G.B^C)guu  
} $. V(_  
as o8  
  四、小结 [ .dNX  
fp12-Hk ~  
  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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