社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 5528阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: ,a$ ?KX  
  ;bZIj` D(  
  一、实现方法 /cy'% .!  
iuX82z`  
  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: CulU?-[i  
\rw/d5.  
#pragma data_seg("shareddata") ma\UJz  
HHOOK hHook =NULL; //钩子句柄 `xhiG9mz~  
UINT nHookCount =0; //挂接的程序数目 2nQrCdRC  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ww]^H$In  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 G2nL#l~@)  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey B~_='0Gm[  
static int KeyCount =0; ;gh#8JkI  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 w :w  
#pragma data_seg() + !I7(gL  
$hkMJ),T~  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ~)zoIM\  
A-GRuC  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: NdS6j'%B@7  
S[b)`Wi D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR )m-l&UK  
cKey,UCHAR cMask) 6!,Am^uXM  
{ JYbE(&l%de  
 BOOL bAdded=FALSE; 0RLyAC|  
 for(int index=0;index<MAX_KEY;index++){ _/W[=c   
  if(hCallWnd[index]==0){ 6T}bD[h4?  
   hCallWnd[index]=hWnd; C6XTId=y#_  
   HotKey[index]=cKey; sI u{_b  
   HotKeyMask[index]=cMask; Z(S=2r.  
   bAdded=TRUE; Uf`lGGM  
   KeyCount++; *|f&a  
   break; fC_dSM[{c  
  } ;JcOm&d/hk  
 } 5ml^3,x  
 return bAdded; )TceNH  
} .oJs"=h:m  
//删除热键 3sk$B%a>Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I$Q%i Z{  
{ i4Y_5  
 BOOL bRemoved=FALSE; *ay>MlcV2=  
 for(int index=0;index<MAX_KEY;index++){ ?,J N?  
  if(hCallWnd[index]==hWnd){ b[^=GF>e  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8QeM6;^/5  
    hCallWnd[index]=NULL; >+[uV ^2[  
    HotKey[index]=0; )V^J^1  
    HotKeyMask[index]=0; .qyk[O  
    bRemoved=TRUE; Fr}e-a  
    KeyCount--; H?M#7K~[  
    break; T4 dYC'z  
   } qIwI]ub~  
  } mGjxc}  
 } ~HwY?[}!m  
 return bRemoved; r@&d88U:  
} $XqfwlUu/4  
@)8QxI^3[  
LF'M!C9|  
  DLL中的钩子函数如下: yJaQcGxE"  
wl{Fx+<^3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :<OInKE>Cx  
{ ?"p:6%GFz  
 BOOL bProcessed=FALSE; =?`5n|A*  
 if(HC_ACTION==nCode) a2dlz@)J  
 { SWjOJjn  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 OQ$77]XtvL  
   switch(wParam) Jlw oSe:S  
   {  ZDZPJp,  
    case VK_MENU: lD!o4ZAo  
     MaskBits&=~ALTBIT; ()}B]?  
     break; 1n! Jfs U  
    case VK_CONTROL: APT'2 -I_  
     MaskBits&=~CTRLBIT; AW8"@  
     break; P!C!E/Jf5  
    case VK_SHIFT: x@F"ZiYD@O  
     MaskBits&=~SHIFTBIT; G 1{F_  
     break; @L%9NqE`O  
    default: //judge the key and send message R|T_9/#)  
     break; Gd)@PWK  
   } BJ3st  
   for(int index=0;index<MAX_KEY;index++){ +igFIoHTM  
    if(hCallWnd[index]==NULL) td@F%*  
     continue; =nEl m*E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X[8m76/V  
    { b;&J2:`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <^&NA<2  
     bProcessed=TRUE; kb?QQ\e  
    } fW Vd[zuD4  
   } VT1W#@`e-  
  } Ox"4 y  
  else if((lParam&0xc000ffff)==1){ //有键按下 YF=@nR$_~j  
   switch(wParam) k/vE|  
   { Q)}sX6TB  
    case VK_MENU: . `lcxC  
     MaskBits|=ALTBIT; =6t)-53  
     break; :K&   
    case VK_CONTROL: E[J7FgU)<S  
     MaskBits|=CTRLBIT; tr2@{xb  
     break; 22L#\qVkl  
    case VK_SHIFT: XF1x*zc  
     MaskBits|=SHIFTBIT; f/ 9]o  
     break; &oevgG  
    default: //judge the key and send message ,cs`6Bd4  
     break; i=%wZHc;  
   } .J3lo:  
   for(int index=0;index<MAX_KEY;index++){ `j088<?j  
    if(hCallWnd[index]==NULL) yzhr"5_  
     continue; o}p6qB=;1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YJ]]6 K+  
    { !!ZNemXct$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); KIdlndGs  
     bProcessed=TRUE; /<Cl\q2 A  
    }  tFvti5  
   } :8U=L'4  
  } hq/k}Y  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 6hSj)  
   for(int index=0;index<MAX_KEY;index++){ SX|b0S,  
    if(hCallWnd[index]==NULL) $kJvPwRO  
     continue; $Q1:>i@I|g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @R>4b  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `gy]|gS#b  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 -p`hevRr  
   } KcVCA    
  } Wx"bW ICc  
 } b/oJ[Vf  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); pYJv|`+  
} &C3J6uCm+  
#rzq9}9tB  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: wH[@#UP3l  
:{C#<g`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >Vc_.dR)E  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :L`  
KYVB=14  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 0@1AH<  
q@P5c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6}2vn5 E//  
{ #KZ- "$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) J0w[vrs&]  
 { 3A]Y=gfa  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \`r5tQr  
  SaveBmp(); GiB3.%R`  
  return FALSE; a3 wUB  
 } E0}`+x  
 …… //其它处理及默认处理 [i.2lt#]  
} =-{+y(<"r  
GAbX.9[V  
v')Fq[H  
  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。 }4Lv-9s,  
$k*E^~qT  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 [g/Hf(&  
'=@O]7o~  
  二、编程步骤 \uQB%yMoz  
A[v]^pv'  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; t/HMJ  
Uf{cUY,j_  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]7v-qd  
_h7!  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; #b []-L!  
? )-*&1cv  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ^V v7u@y  
Afo(! v  
  5、 添加代码,编译运行程序。 ^x %yIS  
~!j1</$_  
三、程序代码 JAen= %2b  
0)-l9V  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wH~Q4)#=o  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ]q7\  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ or\ 2)  
#if _MSC_VER > 1000 k&ujr:)5Y5  
#pragma once ( }5k"9Z  
#endif // _MSC_VER > 1000 { dwm>a  
#ifndef __AFXWIN_H__ 5NbI Vz  
#error include 'stdafx.h' before including this file for PCH l%.3hId-  
#endif }m/aigA[1  
#include "resource.h" // main symbols d~uK/R-KD  
class CHookApp : public CWinApp Z T95g  
{ U/Z!c\r  
 public: jE2k\\<a  
  CHookApp(); "P.7FD  
  // Overrides {w}PV5<  
  // ClassWizard generated virtual function overrides ,\4@Ao  
  //{{AFX_VIRTUAL(CHookApp) \TkBV?W  
 public: pNr3u  
  virtual BOOL InitInstance(); z m\=4^X  
  virtual int ExitInstance(); w<&Nn`V  
  //}}AFX_VIRTUAL {;);E  
  //{{AFX_MSG(CHookApp) SQWwxFJ  
  // NOTE - the ClassWizard will add and remove member functions here. "m0>u,HmI  
  // DO NOT EDIT what you see in these blocks of generated code ! S *?'y  
  //}}AFX_MSG aePhtQF  
  DECLARE_MESSAGE_MAP() %JBp~"  
}; 3\|e8(bc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); }k7@ X  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); soA>&b !?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yPn5l/pDDr  
BOOL InitHotkey(); u2y?WcMv  
BOOL UnInit(); S%-L!V ,  
#endif -7TT6+H)  
lMB^/-Y  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. e(x1w&8dB  
#include "stdafx.h" /cexd_l|f  
#include "hook.h" GKH 7Xx(  
#include <windowsx.h> :)t1>y>3  
#ifdef _DEBUG Qr1%"^4  
#define new DEBUG_NEW ?Q wDV`  
#undef THIS_FILE Fl]$ql   
static char THIS_FILE[] = __FILE__; :e ?qm7cB  
#endif Yq4_ss'nB  
#define MAX_KEY 100 kM*f9x  
#define CTRLBIT 0x04 l~AmHw e  
#define ALTBIT 0x02 ,* ?bET $  
#define SHIFTBIT 0x01 7&/iuP$.  
#pragma data_seg("shareddata") 7=u\D  
HHOOK hHook =NULL; LR]P?  
UINT nHookCount =0; =et=X_3-  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ]zmY] 5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT z(i B$;M  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey \evK.i*KfA  
static int KeyCount =0; nORm7sa9  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @G^]kDFM{  
#pragma data_seg()  r75,mX  
HINSTANCE hins; \A*#a9"  
void VerifyWindow(); [IF3 ,C  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) '{QbjG%<P  
//{{AFX_MSG_MAP(CHookApp) [?)}0cd0  
// NOTE - the ClassWizard will add and remove mapping macros here. 6Y)'p .+g  
// DO NOT EDIT what you see in these blocks of generated code! ,xuqQ;JX  
//}}AFX_MSG_MAP ]}i_NqW)  
END_MESSAGE_MAP() 52q@&')D4M  
Q9q:HGXxv  
CHookApp::CHookApp() BC%t[H} >R  
{ ])'22sY  
 // TODO: add construction code here, k+'Rh'>  
 // Place all significant initialization in InitInstance Ra&HzK?  
} 8k2prv^  
zIf/jk  
CHookApp theApp; J1YP-:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yDWzsA/X  
{ NcZ6!wWdE  
 BOOL bProcessed=FALSE; (ST />")L  
 if(HC_ACTION==nCode) }?$d~]t)  
 { epJVs0W  
  if((lParam&0xc0000000)==0xc0000000){// Key up K;,n?Q w  
   switch(wParam) I{JU<A,&  
   { lJpD>\$}@R  
    case VK_MENU: _S{HVc  
     MaskBits&=~ALTBIT; @ >%I\  
     break; q%bNT  
    case VK_CONTROL:  ;iy]mPd  
     MaskBits&=~CTRLBIT; 73A1+2  
     break; /P<RYA~  
    case VK_SHIFT: %L=ro qz  
     MaskBits&=~SHIFTBIT; D\ HmY_  
     break; z ,87;4-  
    default: //judge the key and send message }N#jA yp!  
     break; s7tNAj bgD  
   } m%m/#\J E  
   for(int index=0;index<MAX_KEY;index++){ _=3H!b =  
    if(hCallWnd[index]==NULL) ~=aGv%vX  
     continue; \kF}E3~+#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eA$9)K1GO  
    { 5O#CdN-S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); n AQB  
     bProcessed=TRUE; *JZU 0Xb  
    } U`ey7   
   } Z=|:D,&  
  } t~)w921>  
  else if((lParam&0xc000ffff)==1){ //Key down 2shr&M fp[  
   switch(wParam) [a53H$`\5  
   { ZtlF]k:MV  
    case VK_MENU: e]!C Aj7uS  
     MaskBits|=ALTBIT; f7)}A/$4+  
     break; "S(m1L?  
    case VK_CONTROL: &"BmCDOq  
     MaskBits|=CTRLBIT; 8|.( Y  
     break; HB\<nK  
    case VK_SHIFT: xop9*Z$  
     MaskBits|=SHIFTBIT; MlkTrKdGi  
     break; :iD( [V  
    default: //judge the key and send message y)t< r  
     break; *^bqpW2$q  
   } _*0!6?c  
   for(int index=0;index<MAX_KEY;index++) w{#K.dx  
   { kpsus \T  
    if(hCallWnd[index]==NULL) GC?\GV  
     continue; ;26a8g(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O(!J^J3_z  
    { 36,qh.LKn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (~?P7RnU%  
     bProcessed=TRUE;  gG1%.q  
    }  Xt(w+  
   } CN#`m]l.  
  } sg;G k/]  
  if(!bProcessed){ 0t*JP  
   for(int index=0;index<MAX_KEY;index++){ bLUn>ch  
    if(hCallWnd[index]==NULL) pFX Do4eH  
     continue; 9w[7X"#n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A7>0Pn%D3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [h""AJ~t  
   } vRp =L54z  
  } V.Dqbv  
 } g05:A0X#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;JDn1(6  
} ^*#5iT8/  
[?r`8K2!,  
BOOL InitHotkey() ?;i O  
{ z\*ii<- @  
 if(hHook!=NULL){ +yiGZV/X  
  nHookCount++; rBye%rQRq  
  return TRUE; 1/c7((]7(,  
 } mg[=~&J^  
 else PEW^Vl-6q  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); P#\L6EO.  
  if(hHook!=NULL) -^=gQ7f9  
   nHookCount++; ~b+4rYNxU_  
  return (hHook!=NULL); 4.$<o/M  
} HUuL3lYka  
BOOL UnInit() ?k<i e2  
{ tH,}_Bp  
 if(nHookCount>1){ v T2YX5k&,  
  nHookCount--; *.K+"WS%  
  return TRUE; EpB2?XGA  
 } 8fKt6T  
 BOOL unhooked = UnhookWindowsHookEx(hHook); r@5_LD@f  
 if(unhooked==TRUE){ y-m<&{q  
  nHookCount=0; 6]^ShOX_Z  
  hHook=NULL; L (XGD  
 } y2gI]A  
 return unhooked; 1`)ie%=  
} fWhwI+  
xbnx*4o0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h-+9Bv]  
{ 5"%r,GMU  
 BOOL bAdded=FALSE; I7ZY9W(S  
 for(int index=0;index<MAX_KEY;index++){ A6v02WG_1T  
  if(hCallWnd[index]==0){ (zIP@ H  
   hCallWnd[index]=hWnd; UX}ZE.cV  
   HotKey[index]=cKey; "*CQ<@+  
   HotKeyMask[index]=cMask; Vcz ExP  
   bAdded=TRUE; w{f!t8C*s  
   KeyCount++; sXDS_Q  
   break; V0q./NuO  
  } RMUR@o5N  
 } 8VQJUwf;  
 return bAdded; Gu}|CFL\  
} /.9j$iK#  
Y*/:IYr`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wkOo8@J\  
{ 6+u}'mSj8  
 BOOL bRemoved=FALSE; lM`M70~  
 for(int index=0;index<MAX_KEY;index++){ _tTtq/z<  
  if(hCallWnd[index]==hWnd){ Gl}[1<~o  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Ox7v*[x'  
    hCallWnd[index]=NULL; X<dQq`kZ  
    HotKey[index]=0; `CA-s  
    HotKeyMask[index]=0; ^\Tde*48  
    bRemoved=TRUE; P +ONQN|  
    KeyCount--; j|gQe .,1  
    break; 28 [hp[<  
   } VHwb 7f]gq  
  } 3/>T/To&2  
 } !G =!^RA  
 return bRemoved; MlaViw  
} &b8Dy=#  
PeGA+0bm  
void VerifyWindow() 92!1I$zi  
{ $"1Unu&P  
 for(int i=0;i<MAX_KEY;i++){ Aw9se"d  
  if(hCallWnd!=NULL){ z )s{>^D  
   if(!IsWindow(hCallWnd)){ +EjH9;gx  
    hCallWnd=NULL; =cI -<0QSn  
    HotKey=0; 0h/gqlTK1  
    HotKeyMask=0; T;K@3]FbX  
    KeyCount--; E/2kX3}  
   } O32p8AxEz  
  } @{ *z1{  
 } RAYDl=}  
} OD7tM0Wn  
iU"jV*P]  
BOOL CHookApp::InitInstance() d2`m0U  
{  Aq674   
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); K>iM6Uv  
 hins=AfxGetInstanceHandle(); :tU&d(8  
 InitHotkey(); -9TNU7^  
 return CWinApp::InitInstance(); \H|tc#::{  
} H_RV#BW&  
l/0"'o_0v#  
int CHookApp::ExitInstance() x O?w8*d  
{ .RF ijr  
 VerifyWindow(); Gx /sJ(  
 UnInit(); _^K)>  
 return CWinApp::ExitInstance(); IaMZPl  
} XgL-t~_  
pxP,cS  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]D_"tQ?i  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) qn) VKx=  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |s[kY  
#if _MSC_VER > 1000 2yZ/'}Mw  
#pragma once h&@ A'om~  
#endif // _MSC_VER > 1000 Dx`-Kg_p  
8 g0By;h;  
class CCaptureDlg : public CDialog g} \$9  
{ .<&o,D  
 // Construction aVkgE>  
 public: [&12`!;j  
  BOOL bTray; l2H-E&'=  
  BOOL bRegistered; JrlDTNJj'  
  BOOL RegisterHotkey(); hM$K?t  
  UCHAR cKey; `/?XvF\  
  UCHAR cMask; +g/TDwyVH  
  void DeleteIcon(); JL gk?  
  void AddIcon(); !SRElb A;i  
  UINT nCount; mU0j K@^&M  
  void SaveBmp(); qQK0s*^W  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor =nPIGI72VO  
  // Dialog Data tgmG#b*  
  //{{AFX_DATA(CCaptureDlg) 4@ EY+p  
  enum { IDD = IDD_CAPTURE_DIALOG }; ) H=}bqn  
  CComboBox m_Key; 8T"C]  
  BOOL m_bControl; ~nYp*t C'  
  BOOL m_bAlt; tg =ClZ-  
  BOOL m_bShift; Y'K+O  
  CString m_Path; t8SvU  
  CString m_Number; pFE&`T@ <  
  //}}AFX_DATA r\nKJdh;ka  
  // ClassWizard generated virtual function overrides }nh!dVA8lh  
  //{{AFX_VIRTUAL(CCaptureDlg) UQ]WBS\  
 public: 6zv-nMZc  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6&,n\EXF  
 protected: me-Tv7WL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1^&qlnqH  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); A"|y<  
  //}}AFX_VIRTUAL  l Ozi|  
  // Implementation zgre&BV0q  
 protected: obA}SF  
  HICON m_hIcon; n-ZOe]3  
  // Generated message map functions bu[PQsT  
  //{{AFX_MSG(CCaptureDlg) 0zJT _H+  
  virtual BOOL OnInitDialog(); 0X \OQ;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); : L}Fm2^  
  afx_msg void OnPaint(); `|nCr  
  afx_msg HCURSOR OnQueryDragIcon(); f3_-{<FZ  
  virtual void OnCancel(); [I6(;lq2  
  afx_msg void OnAbout(); %C8p!)Hu  
  afx_msg void OnBrowse(); BpL7s ej7  
  afx_msg void OnChange(); |#_IAN  
 //}}AFX_MSG j}P xq  
 DECLARE_MESSAGE_MAP() )v\zaz  
}; M"XILNV-~  
#endif poLzgd  
9Q\CJ9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4wLN#dpeEy  
#include "stdafx.h" iYbp^iVg  
#include "Capture.h" NMaZ+g!t(  
#include "CaptureDlg.h" VN3"$@-POK  
#include <windowsx.h> cD^`dn%$  
#pragma comment(lib,"hook.lib") O5rHN;\_  
#ifdef _DEBUG _FpZc ?=  
#define new DEBUG_NEW 8+}yf.`  
#undef THIS_FILE RbOEXH*]  
static char THIS_FILE[] = __FILE__; cV;<!f+  
#endif VTS7K2lBvX  
#define IDM_SHELL WM_USER+1 y $i^C:N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =*paa  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WY>r9+A?W  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; q,Oj  
class CAboutDlg : public CDialog 7TDt2:;]  
{ ?E>(zV1D/  
 public: VkFvV><"  
  CAboutDlg(); MTnW5W-r9  
  // Dialog Data #6g9@tE  
  //{{AFX_DATA(CAboutDlg) >z{*>i,m1  
  enum { IDD = IDD_ABOUTBOX }; l]g /rs  
  //}}AFX_DATA \\ZR~f!<  
  // ClassWizard generated virtual function overrides Rgstk/1  
  //{{AFX_VIRTUAL(CAboutDlg) TRLz>mQ  
 protected: -4 *94<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6YErF|  
  //}}AFX_VIRTUAL V_'!#  
  // Implementation m-xnbTcQ  
 protected: J\06j%d,  
  //{{AFX_MSG(CAboutDlg) ShP&ss  
  //}}AFX_MSG gKPqWh  
  DECLARE_MESSAGE_MAP() uUhqj.::<Y  
}; 6[.#B!;9  
 f$7Xh~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $ ,:3I*}be  
{  w^Mj[v#  
 //{{AFX_DATA_INIT(CAboutDlg) 2SjH7 '  
 //}}AFX_DATA_INIT p :v'"A}  
} dM-qd`  
egXHp<bqw  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) `EBI$;!  
{ %-nYK3  
 CDialog::DoDataExchange(pDX); _cRCG1CJ  
 //{{AFX_DATA_MAP(CAboutDlg) st_.~m!/  
 //}}AFX_DATA_MAP \*a7o GyH>  
} E =*82Y=B  
>Bw<THx  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) x]6-r`O7r  
 //{{AFX_MSG_MAP(CAboutDlg) |\}&mBR  
 // No message handlers w"PnN  
 //}}AFX_MSG_MAP f6of8BOg  
END_MESSAGE_MAP() b(E}W2-t  
@PQ% xcOC7  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Os90fR  
: CDialog(CCaptureDlg::IDD, pParent) kA.U2  
{ (&Kv]--  
 //{{AFX_DATA_INIT(CCaptureDlg) m{v*\e7 P  
  m_bControl = FALSE; 5SB!)F]   
  m_bAlt = FALSE; R^p'gQc$   
  m_bShift = FALSE; \X*Es.;|x  
  m_Path = _T("c:\\"); p&s~O,Bw$  
  m_Number = _T("0 picture captured."); k4C3SI*`4  
  nCount=0; 3-=f@uH!  
  bRegistered=FALSE; &g;&=<#I  
  bTray=FALSE; I>bO<T`  
 //}}AFX_DATA_INIT qsT@aSIo9  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /VmtQ{KTt+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~cf*Oq  
} ^cz4nW<  
A,'F`au  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2@Nt6r  
{ 3 P=I)q  
 CDialog::DoDataExchange(pDX); u?Uu>9@Z  
 //{{AFX_DATA_MAP(CCaptureDlg) )X2 /_3  
  DDX_Control(pDX, IDC_KEY, m_Key); jW8,}Xs  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?lPn{oB9"  
  DDX_Check(pDX, IDC_ALT, m_bAlt); **G5fS.^W  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); k#g` n3L  
  DDX_Text(pDX, IDC_PATH, m_Path); f,}(= u  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /!i`K{  
 //}}AFX_DATA_MAP bo-AM]  
} &E?TR A# E  
Vr ^UEu.w?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Vsj1!}X:  
//{{AFX_MSG_MAP(CCaptureDlg) XsEo tW  
 ON_WM_SYSCOMMAND() 3LkcK1x.  
 ON_WM_PAINT() =#Z+WD-E  
 ON_WM_QUERYDRAGICON() o*t4zF&n  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) V+$^4Ht  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) im&Nkk4n@  
 ON_BN_CLICKED(ID_CHANGE, OnChange) )ep1`n-  
//}}AFX_MSG_MAP ymW? <\AD,  
END_MESSAGE_MAP() U[R[VY7  
Nd h  
BOOL CCaptureDlg::OnInitDialog() '8"nXuL-  
{ eY V Jk7  
 CDialog::OnInitDialog(); YlhyZ&a,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); zl3GWj|?\7  
 ASSERT(IDM_ABOUTBOX < 0xF000); RxYC]R^78  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;Tec)Fl  
 if (pSysMenu != NULL) \zT{zO&!  
 { KaIkO8Dq0  
  CString strAboutMenu; aN;c.1TY  
  strAboutMenu.LoadString(IDS_ABOUTBOX); -`A+Qp)  
  if (!strAboutMenu.IsEmpty()) W]oILL"d  
  {  8+,I(+  
   pSysMenu->AppendMenu(MF_SEPARATOR); 47=YP0r?>T  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Qx_]oz]NY  
  } }Pm; xHnf&  
 } 8Q(A1U  
 SetIcon(m_hIcon, TRUE); // Set big icon :\]qB&  
 SetIcon(m_hIcon, FALSE); // Set small icon u_=^Bd   
 m_Key.SetCurSel(0); _u9bZ'  
 RegisterHotkey(); }rQ0*h  
 CMenu* pMenu=GetSystemMenu(FALSE); JKF/z@Vbe\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "!9FJ Y  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); U1)!X@F{  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0O!A8FA0  
 return TRUE; // return TRUE unless you set the focus to a control |4j'KM;U  
} bIXD(5y  
RgD%pNhI  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 3(,c^F  
{ $Xr4=9(|7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ;r BbLM`  
 { FmhT^  
  CAboutDlg dlgAbout; 4g)$(5jI}  
  dlgAbout.DoModal(); W) ?s''WE;  
 } F|&%Z(@a  
 else 4d8}g25C  
 { +&4@HHU{G  
  CDialog::OnSysCommand(nID, lParam); &U_T1-UR2  
 } Kw =RqF  
} FM"[:&>  
1l s8h  
void CCaptureDlg::OnPaint() ~hb;kc3  
{ LYke\/ md  
 if (IsIconic()) _/NPXDL  
 { c{3P|O&.  
  CPaintDC dc(this); // device context for painting U.Fs9F4M#  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); F*J bTEOn  
  // Center icon in client rectangle jGUegeq  
  int cxIcon = GetSystemMetrics(SM_CXICON); }p>l,HD  
  int cyIcon = GetSystemMetrics(SM_CYICON); s[;1?+EI  
  CRect rect; "9IR|  
  GetClientRect(&rect); X2mZ~RB(p  
  int x = (rect.Width() - cxIcon + 1) / 2; ~IFafAO&  
  int y = (rect.Height() - cyIcon + 1) / 2; f C+tu>=  
  // Draw the icon +fN2%aC  
  dc.DrawIcon(x, y, m_hIcon); ?!u9=??  
 } G6bvV*TRi  
 else s{:Thgv,9  
 { |*g\-2j{  
  CDialog::OnPaint(); tN;^{O-(V  
 } `0`#Uf_/$  
} rrSFmhQUk  
^[VEr"X  
HCURSOR CCaptureDlg::OnQueryDragIcon() t9r R>Y9  
{ r2\ }_pIj  
 return (HCURSOR) m_hIcon; Z~K} @  
} \rY\wa  
2S//5@~_m  
void CCaptureDlg::OnCancel() sWKv> bx  
{ Xdh@ ^`  
 if(bTray) ;;N#'.xD  
  DeleteIcon(); jfYM*%  
  CDialog::OnCancel(); F$S/zh$)0  
} y]g5S-G  
y*E{X  
void CCaptureDlg::OnAbout() G_}oI|B  
{ 44pVZ5c  
 CAboutDlg dlg; `_x#`%!#2  
 dlg.DoModal(); 69 J4p=c,  
} I:WPP'L4o  
;?Q0mXr  
void CCaptureDlg::OnBrowse() f\z9?Z(~  
{ F(`Q62o@  
 CString str; 65GC7 >[  
 BROWSEINFO bi; G+t zp&G@  
 char name[MAX_PATH]; !1mAq+q!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ; hU9_e  
 bi.hwndOwner=GetSafeHwnd(); CoV @{Pi  
 bi.pszDisplayName=name; cqp^**s  
 bi.lpszTitle="Select folder"; 9t7 e~&R  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ?lm<)y?I7+  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  CVZ 4:p  
 if(idl==NULL) 7 6HB@'xY  
  return; !iAZEOkRR  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <9x|)2P  
 str.ReleaseBuffer(); fVYv 2  
 m_Path=str; O O-Obg^  
 if(str.GetAt(str.GetLength()-1)!='\\') ppu<k N  
  m_Path+="\\"; [OFT!=.y &  
 UpdateData(FALSE); t&-c?&FO\;  
} _zLEHEZ-  
.UU)   
void CCaptureDlg::SaveBmp() '.e 5Ku  
{ r<;Y4<,BZ  
 CDC dc; F#o{/u?T  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 5a/3nsup5  
 CBitmap bm; \5b<!Nl  
 int Width=GetSystemMetrics(SM_CXSCREEN); =nCV. Wf  
 int Height=GetSystemMetrics(SM_CYSCREEN); Is97>aid  
 bm.CreateCompatibleBitmap(&dc,Width,Height); UJ`%uLR~  
 CDC tdc; sA }X)aP  
 tdc.CreateCompatibleDC(&dc); Cyud)BZvm  
 CBitmap*pOld=tdc.SelectObject(&bm); G }M!  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \rCdsN2H  
 tdc.SelectObject(pOld); n&8N`!^o  
 BITMAP btm; }dSFv   
 bm.GetBitmap(&btm); Y5TBWcGU%  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; (CE2]Nv9")  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .yb8<qs  
 BITMAPINFOHEADER bih; s%?<:9  
 bih.biBitCount=btm.bmBitsPixel; V{{UsEVO  
 bih.biClrImportant=0; WX+@<y}%  
 bih.biClrUsed=0; 7A  
 bih.biCompression=0; AI .2os*  
 bih.biHeight=btm.bmHeight; >Lz2zlZI  
 bih.biPlanes=1; pe+m%;nzR  
 bih.biSize=sizeof(BITMAPINFOHEADER); 72y!cK6  
 bih.biSizeImage=size; gIcPKj"8${  
 bih.biWidth=btm.bmWidth; i k0w\*  
 bih.biXPelsPerMeter=0; ^1ks`1  
 bih.biYPelsPerMeter=0; CF5%&B  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); `~@}f"c`u  
 static int filecount=0; }J=zO8OL  
 CString name; }Ub "Vb  
 name.Format("pict%04d.bmp",filecount++); n4zns,:)/  
 name=m_Path+name; os(}X(   
 BITMAPFILEHEADER bfh; / `w'X/'VJ  
 bfh.bfReserved1=bfh.bfReserved2=0; 7wqD_Xr  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Z8pZm`g)T  
 bfh.bfSize=54+size; u[!Ex=9W  
 bfh.bfOffBits=54; =PoPp  
 CFile bf; #elaz8 5  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \)PS&Y8n  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); U4Pk^[,p1G  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $P&27  
  bf.WriteHuge(lpData,size); :wJ!rn,4  
  bf.Close(); SHC VjI6  
  nCount++; T f^O(  
 } 16I(S  
 GlobalFreePtr(lpData); B^1Io9  
 if(nCount==1) GF Rd:e  
  m_Number.Format("%d picture captured.",nCount); ||?wRMV  
 else tWdP5vfp  
  m_Number.Format("%d pictures captured.",nCount); QpifO  
  UpdateData(FALSE); 2K'}Vm+  
} ^[zF IO  
l1RFn,Tzr  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {K2F(kz?T  
{ "2@Ys* e  
 if(pMsg -> message == WM_KEYDOWN) n]btazM{  
 { Q1'D*F4  
  if(pMsg -> wParam == VK_ESCAPE) LZu_-I  
   return TRUE; 1x|/z,   
  if(pMsg -> wParam == VK_RETURN) c>Ljv('bj  
   return TRUE; ~#[ ZuMO?  
 } to 3i!b  
 return CDialog::PreTranslateMessage(pMsg); m<22E0=g  
} Q&9& )8-  
@aGS~^U h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Mq,_DQ  
{ vGPaWYV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n1c Q#u  
  SaveBmp(); z9KsSlS ^  
  return FALSE; g:c @  
} Th*mm3D6  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %n #^#:   
 CMenu pop; jfrUOl'l  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 'w7{8^Z2  
 CMenu*pMenu=pop.GetSubMenu(0); {EupB?  
 pMenu->SetDefaultItem(ID_EXITICON); 8|,-P=%t  
 CPoint pt; G,i%:my7  
 GetCursorPos(&pt); 8 _[f#s`)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Qod2m$>wp}  
 if(id==ID_EXITICON) >Y/1%Hp9  
  DeleteIcon(); :ui1]its4  
 else if(id==ID_EXIT) l+ <x  
  OnCancel(); ]t3 NA*mM  
 return FALSE; P.1iuZ "w  
} ]j:Ikb}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ByZ.!~  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 63- YWhs;  
 AddIcon(); _E[{7 "3}  
 return res; *)d|:q3  
} _V|'iz9.  
E]Hl&t/}  
void CCaptureDlg::AddIcon() zR3Z(^]v  
{ ss 3fq}  
 NOTIFYICONDATA data; wh:`4Yw  
 data.cbSize=sizeof(NOTIFYICONDATA); jW",'1h<n  
 CString tip; L=}UApK  
 tip.LoadString(IDS_ICONTIP); D2Go,1  
 data.hIcon=GetIcon(0); p:ST$ 1 K  
 data.hWnd=GetSafeHwnd(); P-`^I`r  
 strcpy(data.szTip,tip); osX23T~-  
 data.uCallbackMessage=IDM_SHELL; YKvFZH)  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; I_ .;nU1xA  
 data.uID=98; #(*WxVE  
 Shell_NotifyIcon(NIM_ADD,&data); U>x2'B v  
 ShowWindow(SW_HIDE); LDvF)Eg  
 bTray=TRUE; = -pss 47  
} JnY3]  
AQ 7e  
void CCaptureDlg::DeleteIcon() ^! ZjK-$A<  
{ cCV"(Oo[H|  
 NOTIFYICONDATA data; Nd!2 @?V4  
 data.cbSize=sizeof(NOTIFYICONDATA); "x$S%:p  
 data.hWnd=GetSafeHwnd(); .Na>BR\F  
 data.uID=98; NV-9C$<n2!  
 Shell_NotifyIcon(NIM_DELETE,&data); /9w}[y*E  
 ShowWindow(SW_SHOW); N<>dg  
 SetForegroundWindow(); _ zmx  
 ShowWindow(SW_SHOWNORMAL); d8RpL{9\7  
 bTray=FALSE; p go\(K0  
} 8rp-Xi W  
iK %Rq  
void CCaptureDlg::OnChange() X0Oq lAw  
{ )Y&De)=  
 RegisterHotkey(); EJtU(HmW  
} OEwfNZQ-  
BtHvfoT  
BOOL CCaptureDlg::RegisterHotkey() JN KZ'9  
{ F5<{-{Ky  
 UpdateData(); u\.sS|$  
 UCHAR mask=0; M<~F>(wxA  
 UCHAR key=0; NxX1_d  
 if(m_bControl) N[+dX_h  
  mask|=4; =;/h{ t  
 if(m_bAlt) usTCn3u  
  mask|=2; MM8)yCI  
 if(m_bShift) };!c]/,  
  mask|=1; B=c^ma  
  key=Key_Table[m_Key.GetCurSel()]; .RWBn~b#I  
 if(bRegistered){ eu:_V+  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ;W*$<~_  
  bRegistered=FALSE; E0DEFB  
 } eXaDx%mM  
 cMask=mask; `A^} X  
 cKey=key; -<O:isB   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); zuPH3Q={  
 return bRegistered; KnFbRhu[  
} #EM'=Q%TO  
G<dXJ ]\\  
  四、小结 #dfW1@m  
y14@9<~9  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八