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
  • 6776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: RWE~&w G}  
  _'c+fG \  
  一、实现方法 kME^tpji  
6GOg_P  
  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: : ej_D}  
:VFTVmr  
#pragma data_seg("shareddata") uu3M{*}  
HHOOK hHook =NULL; //钩子句柄 PPgW ^gj  
UINT nHookCount =0; //挂接的程序数目 6$z'wy/*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 }N|\   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 n#>5?W  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey R92R}=G!  
static int KeyCount =0; cj^bh  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 FQ##397  
#pragma data_seg() Doj(.wm~  
]^ !}*  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ;Id"n7W  
 QT_^M1%  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: N(7u],(Om  
#ko6L3Pi  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR BK*UR+,  
cKey,UCHAR cMask) AY@k-4  
{ ~y@& }  
 BOOL bAdded=FALSE; -R74/GBg  
 for(int index=0;index<MAX_KEY;index++){ !=knppY  
  if(hCallWnd[index]==0){ t[j9R#02?  
   hCallWnd[index]=hWnd; =SL^>HS.fo  
   HotKey[index]=cKey; f\=6I3z  
   HotKeyMask[index]=cMask; uH] m]t  
   bAdded=TRUE; 9/Wn!Ld  
   KeyCount++; w< mqe0  
   break; 5C65v:Q`N  
  } bQpoXs0w;  
 } /gX%ABmS  
 return bAdded; 8'% +G  
} U 5clQiow  
//删除热键 q!@c_o  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Hq-v@@0 *  
{ |QMT A5  
 BOOL bRemoved=FALSE; b8e*Pv/  
 for(int index=0;index<MAX_KEY;index++){ T#/11M$uQ  
  if(hCallWnd[index]==hWnd){ iI}nW  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6<+8}`@B>G  
    hCallWnd[index]=NULL; Qv74?B@  
    HotKey[index]=0; E~qK&7+  
    HotKeyMask[index]=0; :g/{(#E@Z  
    bRemoved=TRUE; h4hd<,  
    KeyCount--; !Am =v=>  
    break; 0x6@{0  
   } hPS/CgLq  
  } P0Aas)!  
 } =$[W,+X6f  
 return bRemoved; oX2r?.j#M  
} Mc.^s  
sAf9rZt*'  
Us*Vn  
  DLL中的钩子函数如下: &,F elB0*  
5'),)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9B& }7kk  
{ Jr|K>  
 BOOL bProcessed=FALSE;  hgNY[,  
 if(HC_ACTION==nCode) Un~]Q?w  
 { j`Tm\!q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 xMLrLXy  
   switch(wParam) yFIl^Ck%  
   {  &qG? [R{  
    case VK_MENU: 9{T 8M  
     MaskBits&=~ALTBIT; -<H ri5  
     break; rGGS]^  
    case VK_CONTROL: ^"PfDTyA  
     MaskBits&=~CTRLBIT; lrq>TJEcx  
     break; ~>lOl/n5  
    case VK_SHIFT: "Wxo[I  
     MaskBits&=~SHIFTBIT; !>?4[|?n<  
     break; hYs82P|2Ol  
    default: //judge the key and send message /vMQF+  
     break; tuX =o  
   } p|xs|O6{  
   for(int index=0;index<MAX_KEY;index++){ B!$V\Gs  
    if(hCallWnd[index]==NULL) xn0s`I[  
     continue; I3V{"Nx6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X L{{7%j  
    { )*"T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6tDg3`w>  
     bProcessed=TRUE; oUnq"]  
    } oFX"F0rx  
   } $K5ni{M;  
  } OaX HJ^k  
  else if((lParam&0xc000ffff)==1){ //有键按下 `two|gX0K  
   switch(wParam) [1t\|v  
   { 3RBpbTNWp  
    case VK_MENU: ^p{A!I!  
     MaskBits|=ALTBIT; kxt\{iy4  
     break; "H wVK  
    case VK_CONTROL: ,+swH;=7#r  
     MaskBits|=CTRLBIT; 0(Yh~{   
     break; Yg\{S<wr  
    case VK_SHIFT: Tw`F?i~  
     MaskBits|=SHIFTBIT; U}mL, kj"  
     break; (CKhY~,/u  
    default: //judge the key and send message @S/g,;7"  
     break; ^K1~eb*K  
   } E#IiyZ  
   for(int index=0;index<MAX_KEY;index++){ jV(xYA3  
    if(hCallWnd[index]==NULL) # CP9^R S  
     continue; 0R2S@4%Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A52LH,  
    { }.fZy&_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =%:n0S0C"  
     bProcessed=TRUE; $9LGdKZ_D  
    } .b!OZ  
   } YD0vfwh  
  } !;xf>API  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 r_!{!i3B  
   for(int index=0;index<MAX_KEY;index++){ [="g|/M)  
    if(hCallWnd[index]==NULL) 3[00-~&U  
     continue; e{q p!N1!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |,M#8NOp:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); t(uB66(_F  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 \S|VkPv  
   }  )zk?yY6  
  } r-1yJ  
 } 2ZTyo7P  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); nsr _\F\  
} x`j$9XN5  
|)|vG_  
  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:  HzgQI  
(F4dFh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /jK17}j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $h|I7`  
"R\\\I7u  
  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: 3Aqe;Wf9%+  
~,M;+T}[r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) b6?Xo/lJ.  
{ I49=ozPP  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]6i_d  
 { gs`27Gih  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #Kb)>gzT  
  SaveBmp(); Bcd0   
  return FALSE; qI4R`P"  
 } ] fwTi(4y  
 …… //其它处理及默认处理 $J;=Ux)$  
} fO^EMy\  
v0H>iKh7  
r,Y/4(.c7U  
  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。 u}@% 70A  
u6bB5(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。 =vqE=:X6  
RL]lt0O{  
  二、编程步骤 8' g*}[  
DY+8m8!4H  
  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"; @]VvqCk  
-c<1H)W  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 40l#'< y;  
|]2eGrGj4  
  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; ay7+H7^|hZ  
vI:bl~  
  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"Y Fu^L  
u_/OTy  
  5、 添加代码,编译运行程序。 T$8$9D_u  
Q,M/R6i-  
三、程序代码 ;Cp/2A}Xx  
"=Fn.r4I  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL zf!\wY"`  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) MkV*+LXC  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ l.NkS   
#if _MSC_VER > 1000 q NQ3(1xW  
#pragma once %Cbc@=k  
#endif // _MSC_VER > 1000 nLN6@  
#ifndef __AFXWIN_H__ $xn%i\  
#error include 'stdafx.h' before including this file for PCH XtH_+W+O  
#endif +EB,7<5<  
#include "resource.h" // main symbols Zn*CJNB  
class CHookApp : public CWinApp Uub%s`O  
{ >J75T1PH=  
 public: p~zTRnm  
  CHookApp(); E,yzy[gl  
  // Overrides Vwh&^{Eh  
  // ClassWizard generated virtual function overrides 3b[[2x_UU  
  //{{AFX_VIRTUAL(CHookApp) 0 c'2rx  
 public: I9j+x ])  
  virtual BOOL InitInstance(); d\<aJOi+-  
  virtual int ExitInstance(); &u`rE""  
  //}}AFX_VIRTUAL M0IqQM57N  
  //{{AFX_MSG(CHookApp) n~>CE"q  
  // NOTE - the ClassWizard will add and remove member functions here. >zx50e)  
  // DO NOT EDIT what you see in these blocks of generated code ! Q{|'g5(O  
  //}}AFX_MSG TboHP/  
  DECLARE_MESSAGE_MAP() wbF1>{/"  
}; 2,QApW_Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -0J<R;cVs  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K}*p(1$u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;NVTn<Uj  
BOOL InitHotkey(); %<*pM@  
BOOL UnInit(); w#bbm'j7r  
#endif )*<d1$aM  
lJQl$Wx^  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^A$XXH '  
#include "stdafx.h" 28qWC~/9  
#include "hook.h" 3'@jRK  
#include <windowsx.h> `YU:kj<6  
#ifdef _DEBUG ]X;*\-  
#define new DEBUG_NEW !rmo*-=^=  
#undef THIS_FILE 8\t7}8f  
static char THIS_FILE[] = __FILE__; btz3f9  
#endif &IPK5o,  
#define MAX_KEY 100 l{SPV8[i  
#define CTRLBIT 0x04 2o3k=hKS  
#define ALTBIT 0x02 -+2xdLa63  
#define SHIFTBIT 0x01 Y%cA2V\#m  
#pragma data_seg("shareddata") uC ;PP=z  
HHOOK hHook =NULL; zgOwSg8  
UINT nHookCount =0; <y/AEY1  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey <T~fh>a  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT "YU~QOGx@  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 8}b[Q/h!  
static int KeyCount =0; Y`p&*O  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift iYs?B0*JWK  
#pragma data_seg() =@/^1.`  
HINSTANCE hins; >N"PLSY1  
void VerifyWindow(); !x / Z"  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) p" W0$t.  
//{{AFX_MSG_MAP(CHookApp) Z 2jMBe  
// NOTE - the ClassWizard will add and remove mapping macros here. -^yc yZ  
// DO NOT EDIT what you see in these blocks of generated code! p%tg->#L  
//}}AFX_MSG_MAP tl#s:  
END_MESSAGE_MAP() `%:(IGxz  
X51$5%  
CHookApp::CHookApp() tce8*:rNH  
{ dV*rnpN  
 // TODO: add construction code here, } ZGpd9D  
 // Place all significant initialization in InitInstance m|gd9m $,?  
} `r$WInsDu  
6u3(G j@  
CHookApp theApp; n 9M6wS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ai9,4  
{ -%$ dFq  
 BOOL bProcessed=FALSE; $ !=:ES  
 if(HC_ACTION==nCode) RIx6& 7$  
 { PX/0  jv  
  if((lParam&0xc0000000)==0xc0000000){// Key up .[ s82c]]6  
   switch(wParam) =xP{f<`   
   { !Hj)S](F  
    case VK_MENU: |H@p^.;  
     MaskBits&=~ALTBIT; ;itg>\ p3  
     break; nL~ b   
    case VK_CONTROL: /hR]aw  
     MaskBits&=~CTRLBIT; xGk4KcxKs  
     break; f_Bf}2Eedj  
    case VK_SHIFT: e:occT  
     MaskBits&=~SHIFTBIT; Lwk-  
     break; {627*6,  
    default: //judge the key and send message be@uHikp;v  
     break; (j"MsCwE  
   } TnAX;+u  
   for(int index=0;index<MAX_KEY;index++){ fdHxrH >*  
    if(hCallWnd[index]==NULL) 5nb6k,+E  
     continue; y Dw!u[:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o)WSMV(&f  
    { KK|Jach  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); I/|n ma/ $  
     bProcessed=TRUE; 63$m& ]x  
    } [GM<Wt0  
   } )CQ}LbXZy  
  } ZeV)/g,w  
  else if((lParam&0xc000ffff)==1){ //Key down \(L^ /]}G)  
   switch(wParam) ,BAF?} 04=  
   { EV$n>.  
    case VK_MENU: Wno5B/V  
     MaskBits|=ALTBIT; A>yIH)b  
     break; gvYs<,:  
    case VK_CONTROL: `h6W@ROb  
     MaskBits|=CTRLBIT; e vuP4-[y  
     break; m"]ys #  
    case VK_SHIFT: W -&5 v  
     MaskBits|=SHIFTBIT; 1fZ:^|\  
     break; xM\ApN~W  
    default: //judge the key and send message 8?XZF[D  
     break; >j3N-;o@?  
   } :B~c>:  
   for(int index=0;index<MAX_KEY;index++) RGmpkQEp  
   { !f 6  
    if(hCallWnd[index]==NULL) T(F8z5s5  
     continue; 5;Xrf=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t`B']Ac;T  
    { Nig-D>OS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); c2/HY8ttRD  
     bProcessed=TRUE; 7/L7L5h<  
    } 1O4"MeF  
   } p6'8l~W+  
  } flqTx)xE  
  if(!bProcessed){ ~l~g0J  
   for(int index=0;index<MAX_KEY;index++){ -s"lW 7N^  
    if(hCallWnd[index]==NULL) 605|*(  
     continue; .2xkf@OP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) QL#y)G53Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !=:c8V  
   } hLRQ)  
  } nmr>Aj8[  
 } L%FL{G  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); intf%T5#  
} wG O)!u 4  
Cx[4 /~_<  
BOOL InitHotkey() kns]P<g  
{ V_!i KEU  
 if(hHook!=NULL){ )Yml'?V"  
  nHookCount++; uc_ X;M;  
  return TRUE; @d\F; o<  
 } pC6_ jIZ  
 else n>WS@b/o  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); GSp1,E2J  
  if(hHook!=NULL) (agdgy:#  
   nHookCount++; iweP3u##  
  return (hHook!=NULL); 2olim1  
} /!hW6u5  
BOOL UnInit() |w DCIHzQ  
{ U,'n}]=4A3  
 if(nHookCount>1){ jJ|;Nwm<[  
  nHookCount--; L6^h3*JyD  
  return TRUE; J}JnJV8|G  
 } m| Z)h{&  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ZAE;$pkP  
 if(unhooked==TRUE){ @lwqk J  
  nHookCount=0; isjkfl-!  
  hHook=NULL; F r~xN!  
 } G;e}z&6<k  
 return unhooked; V;"'!dVX  
} KjadX&JD  
xk/(| f{L  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U^xFqJY6  
{ {)mlXo(On  
 BOOL bAdded=FALSE; (I$hw"%&  
 for(int index=0;index<MAX_KEY;index++){ am}zOr\  
  if(hCallWnd[index]==0){ hXCDlCO  
   hCallWnd[index]=hWnd; =["GnL*!0  
   HotKey[index]=cKey; b|NEU-oy  
   HotKeyMask[index]=cMask; ?CIa)dhu  
   bAdded=TRUE; 5GKz@as8  
   KeyCount++; G.Q+"+* ^  
   break; M0|z^2  
  } jAu/] HZx  
 } W;=ZQ5Lw  
 return bAdded; @bZb#,n]  
} 2h=RNU|  
N$ ?qAek  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) SC#  
{ vQ;Z 0_  
 BOOL bRemoved=FALSE; .FeEK(  
 for(int index=0;index<MAX_KEY;index++){ hYLu   
  if(hCallWnd[index]==hWnd){ 9I,Trk@&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ BEw(SQH  
    hCallWnd[index]=NULL; '>Z Ou3>  
    HotKey[index]=0; aePk^?KbB  
    HotKeyMask[index]=0; fIu/*PFPVY  
    bRemoved=TRUE; d/MMPge3  
    KeyCount--; R7#B_^ $  
    break; 2'D2>^os  
   } ^Kn}{m/3Y  
  } 8O]$)E  
 } ujaaO6oZ7  
 return bRemoved; [|vd r.  
} J( 0c#}d  
j*GYYEY  
void VerifyWindow() [,VD^\  
{ 7z}NI,R}1  
 for(int i=0;i<MAX_KEY;i++){ zJPzI{-w|  
  if(hCallWnd!=NULL){ ;e+ErN`a.~  
   if(!IsWindow(hCallWnd)){ ]\{EUx9  
    hCallWnd=NULL; =cxjb,r  
    HotKey=0; j sm{|'  
    HotKeyMask=0; 4oJ0,u  
    KeyCount--; 4v;/"4)'  
   } uKK+V6}!kj  
  } ct`89~"  
 } &U:;jlST9  
} z Mtx>VI  
u-D%: lz85  
BOOL CHookApp::InitInstance() V V<Zl  
{ 6:H@= fEv  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); |(]XZ!{  
 hins=AfxGetInstanceHandle(); 0y*8;7-|r)  
 InitHotkey(); kIyif7  
 return CWinApp::InitInstance(); 3{CXIS  
} y\S}U{*Z'  
alyWp  
int CHookApp::ExitInstance() Dc U$sf*  
{ *~cq (PFQ  
 VerifyWindow(); q>t#5Z81  
 UnInit(); #>}cuC@  
 return CWinApp::ExitInstance(); qeypa !  
} d-y8c  
umI@ej+D  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file O|d"0P  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) U`z=!KI+g  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `ml  
#if _MSC_VER > 1000 %AaZc=a[c  
#pragma once r[K%8Y8`  
#endif // _MSC_VER > 1000  (cx Q<5  
vr"O9L w  
class CCaptureDlg : public CDialog ka0MuQ M  
{ <m'W{n%Pp  
 // Construction G8}k9?26(  
 public: kZ$2Uss  
  BOOL bTray; /V0[Urc@  
  BOOL bRegistered; HQX.oW  
  BOOL RegisterHotkey(); 4}`z^P<C  
  UCHAR cKey; ew?4;  
  UCHAR cMask; -%,=%FBi~4  
  void DeleteIcon(); f}=>c|Do  
  void AddIcon(); *PM#ngLX}r  
  UINT nCount; ?k@^U9?R  
  void SaveBmp(); xa8;"Y~"bg  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor JV ydTvc  
  // Dialog Data gamE^Ee  
  //{{AFX_DATA(CCaptureDlg) 6+!$x?5|NP  
  enum { IDD = IDD_CAPTURE_DIALOG }; _0}u0fk  
  CComboBox m_Key; {^8?fJ/L  
  BOOL m_bControl; ia@ |+r  
  BOOL m_bAlt; 2)hfYLi  
  BOOL m_bShift; ,Wv+Ek  
  CString m_Path; SP.k]@P  
  CString m_Number; fYSH]!  
  //}}AFX_DATA fJOw E g|  
  // ClassWizard generated virtual function overrides Hsn'"  
  //{{AFX_VIRTUAL(CCaptureDlg) L+N\B@ 0-  
 public: Fs"i fn0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); rU+3~|m  
 protected: `J] e.K  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support SSxp!E'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); .do8\  
  //}}AFX_VIRTUAL ulE5lG0c  
  // Implementation oR7[[H.4  
 protected: kM J}sS  
  HICON m_hIcon; /yHjd s  
  // Generated message map functions eSQkW  
  //{{AFX_MSG(CCaptureDlg) ]~2iducB,  
  virtual BOOL OnInitDialog(); ^"<x4e9+j  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); eAmI~oku  
  afx_msg void OnPaint(); d a<>a  
  afx_msg HCURSOR OnQueryDragIcon(); Unvl~lm6  
  virtual void OnCancel(); `Fie'[F5,)  
  afx_msg void OnAbout(); +5S>"KAUt0  
  afx_msg void OnBrowse(); 7Xx3s@  
  afx_msg void OnChange(); rY 6x):sC  
 //}}AFX_MSG 793 15A  
 DECLARE_MESSAGE_MAP() !B 4zU:d  
}; d?&`Z Vl  
#endif ,Kl:4 Tv  
dP?prT  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file tL3R<'  
#include "stdafx.h" |QS3nX<  
#include "Capture.h" A|GtF3:G  
#include "CaptureDlg.h" u?" ="-^  
#include <windowsx.h> n&Ckfo_D  
#pragma comment(lib,"hook.lib") /v^ '5j1o  
#ifdef _DEBUG PChew3  
#define new DEBUG_NEW 6#7hMQ0&;O  
#undef THIS_FILE yUj`vu 2  
static char THIS_FILE[] = __FILE__; vn+XY =Qnr  
#endif o2X95NiH  
#define IDM_SHELL WM_USER+1 Pr1q X5>=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Xf_#O'z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <4+P37^ ~  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; VE-l6@`  
class CAboutDlg : public CDialog XHekz6_  
{ ;+<IWDo  
 public: qmFG  
  CAboutDlg(); g!R7CRt%  
  // Dialog Data N]w_9p~=1  
  //{{AFX_DATA(CAboutDlg) :~ pGHl  
  enum { IDD = IDD_ABOUTBOX }; T/\RViG3  
  //}}AFX_DATA Sp492W+  
  // ClassWizard generated virtual function overrides =nHKTB>  
  //{{AFX_VIRTUAL(CAboutDlg) [02rs@c>  
 protected: #h?I oB7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [K&%l]P7  
  //}}AFX_VIRTUAL 6LBdTnzUd  
  // Implementation H}$7c`;q  
 protected: Hl,{4%]  
  //{{AFX_MSG(CAboutDlg) is4}s,]$6  
  //}}AFX_MSG Up{[baWF  
  DECLARE_MESSAGE_MAP() .JPN';  
}; aOH|[  
8 MQq3  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ZU73UL  
{ eCYPd-d  
 //{{AFX_DATA_INIT(CAboutDlg) Z+&V  >  
 //}}AFX_DATA_INIT >G:Q/3jh  
}  !BsQJ_H  
!l9{R8m>eJ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) m<h%BDSzr{  
{ I.n,TJoz4J  
 CDialog::DoDataExchange(pDX); hyH[`wiq  
 //{{AFX_DATA_MAP(CAboutDlg) 9B!Sv/)y!r  
 //}}AFX_DATA_MAP dymq Z<  
} YIg(^>sq  
1uAjy(y  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ,WRm{ v0f^  
 //{{AFX_MSG_MAP(CAboutDlg) `gX|q3K\s  
 // No message handlers inWLIXC,  
 //}}AFX_MSG_MAP J,F1Xmr4  
END_MESSAGE_MAP() 2aj1IBnz6/  
lI<jYd 0fZ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) =]%JTGdp(  
: CDialog(CCaptureDlg::IDD, pParent) U?UU] >Q  
{ ISGw}#}]?  
 //{{AFX_DATA_INIT(CCaptureDlg) cLV*5?gVO  
  m_bControl = FALSE; G&ck98  
  m_bAlt = FALSE; /'sv7hg+  
  m_bShift = FALSE; X`.##S KC  
  m_Path = _T("c:\\"); ib=)N)l  
  m_Number = _T("0 picture captured."); 8zp?WUb  
  nCount=0; )2&3D"V  
  bRegistered=FALSE; AELj"=RA  
  bTray=FALSE; h} `v0E  
 //}}AFX_DATA_INIT B*T n@t W  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 { ADd[V  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 5(+9a   
} /65YHXg,  
qX ,q*hr-  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }u_D{bz  
{ 0P$1=oK  
 CDialog::DoDataExchange(pDX); !*-|!Vz  
 //{{AFX_DATA_MAP(CCaptureDlg) @G4Z  
  DDX_Control(pDX, IDC_KEY, m_Key); I L*B@E8  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ` ,\b_SFg  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6 9>@0P  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); )x6 &Y  
  DDX_Text(pDX, IDC_PATH, m_Path); ~/L:$  
  DDX_Text(pDX, IDC_NUMBER, m_Number); M+ +Dk7B  
 //}}AFX_DATA_MAP zjmo IE  
} Db|f"3rq?  
Fi i(dmn  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3"h*L8No  
//{{AFX_MSG_MAP(CCaptureDlg) 1#vu)a1+b  
 ON_WM_SYSCOMMAND() if*V-$[I  
 ON_WM_PAINT() o%_-u +  
 ON_WM_QUERYDRAGICON() cXq9k!I%  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 9^a|yyzL  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) L]=]/>jQ6  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ]3 "0#Y  
//}}AFX_MSG_MAP D_l$"35?  
END_MESSAGE_MAP() Ca~8cQ  
pr<u 5  
BOOL CCaptureDlg::OnInitDialog() Cog}a  
{ &]TniQH  
 CDialog::OnInitDialog(); Qw0k-t0=4  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); hk?i0#7W  
 ASSERT(IDM_ABOUTBOX < 0xF000); %r^tZ;; l  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Zz0er|9]Q  
 if (pSysMenu != NULL) y4kn2Mw;  
 { 9C7Npf?~M  
  CString strAboutMenu; wq?"NQ?O<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); S)EF&S(TC  
  if (!strAboutMenu.IsEmpty()) F$UL.`X _/  
  { lV'?X%  
   pSysMenu->AppendMenu(MF_SEPARATOR); #N][-i  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "09v6Tx  
  } "]eB2k_>  
 } ja9u?UbW  
 SetIcon(m_hIcon, TRUE); // Set big icon ew\:&"@2]w  
 SetIcon(m_hIcon, FALSE); // Set small icon n.l#(`($4  
 m_Key.SetCurSel(0); e#oK% {A  
 RegisterHotkey(); o33t~@RX  
 CMenu* pMenu=GetSystemMenu(FALSE); LH54J;7 Y  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "~VKUvDu  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ]y#'U  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); l;q]z  
 return TRUE; // return TRUE unless you set the focus to a control H^'%$F?Ss  
} ~7b#B XzP  
? l~qb]._  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #H6YI3 `G  
{ 3FvVM0l"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Jj)J5 S /  
 { E{)X ;kN=  
  CAboutDlg dlgAbout; Tv#d>ZSD  
  dlgAbout.DoModal();  L]l/w  
 } 5@RcAQb:  
 else Ys.GBSlHG  
 { (g@X.*c8  
  CDialog::OnSysCommand(nID, lParam); f I%8@ :  
 } uG -+&MU?  
} H`M|B<.  
#|T"6jJaQ  
void CCaptureDlg::OnPaint() b~UWFX#U  
{ XZN@hXc9:v  
 if (IsIconic()) RL&0?OT  
 { ; o'>`=Y  
  CPaintDC dc(this); // device context for painting 7#wB  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); E-^(VZ_Xj  
  // Center icon in client rectangle 8Vz!zYl  
  int cxIcon = GetSystemMetrics(SM_CXICON); <',k%:t  
  int cyIcon = GetSystemMetrics(SM_CYICON); N( 7(~D=)B  
  CRect rect; VsTgK  
  GetClientRect(&rect); HY_>sD  
  int x = (rect.Width() - cxIcon + 1) / 2; Cgln@Rz  
  int y = (rect.Height() - cyIcon + 1) / 2; p8XvfM  
  // Draw the icon +-b'+mF  
  dc.DrawIcon(x, y, m_hIcon); 6|lsG6uf  
 } |11vm#  
 else 8+Tv@  
 { !\|  
  CDialog::OnPaint(); ^O<v'\!z-  
 } ;ZuHv {=  
} W\-`}{B_/  
fn/?I \  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1.u^shc&|  
{ dSKvs"  
 return (HCURSOR) m_hIcon; /pkN=OBR  
} VMF?qT3Nd  
FO>!T@0G  
void CCaptureDlg::OnCancel() &u^]YE{  
{ =RXeN+ &R  
 if(bTray) >o13?-S%e  
  DeleteIcon(); > dVhIbG  
  CDialog::OnCancel(); Jw=7eay$F  
} U]+IP;YS  
@C^x&Sjm  
void CCaptureDlg::OnAbout() mW{uChHP  
{ y$nI?:d  
 CAboutDlg dlg; ~$>JYJj  
 dlg.DoModal(); &HLG<ISw  
} 6:S, {@G  
s>G]U)d<'  
void CCaptureDlg::OnBrowse() 8ZbXGQ  
{ lvODhoT  
 CString str; |5`ecjb.  
 BROWSEINFO bi; \ :s%;s51  
 char name[MAX_PATH]; 9i 9 ,X^=  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); &/Gn!J;1  
 bi.hwndOwner=GetSafeHwnd(); l x;87MDs  
 bi.pszDisplayName=name; )c*xKij  
 bi.lpszTitle="Select folder"; <sm"3qs"_  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; CG@Fn\J  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); # hn  
 if(idl==NULL) eD(5+bm  
  return; K"t?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !oXFDC3k  
 str.ReleaseBuffer(); -1B.A  
 m_Path=str; >&e=0@?+G  
 if(str.GetAt(str.GetLength()-1)!='\\') x&J\swN9  
  m_Path+="\\"; :qqG%RB  
 UpdateData(FALSE); "(W;rl  
} Hmm0H6&u  
VI9rezZ*  
void CCaptureDlg::SaveBmp() )M"NMUuU"  
{ 3QZm *. /"  
 CDC dc; p),* 4@2<  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); zd8A8]&-  
 CBitmap bm; {R63n  
 int Width=GetSystemMetrics(SM_CXSCREEN); ?[bE/Ya+S  
 int Height=GetSystemMetrics(SM_CYSCREEN); WY>$.e  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 7neJV  
 CDC tdc; />8A?+g9u  
 tdc.CreateCompatibleDC(&dc); [G|(E  
 CBitmap*pOld=tdc.SelectObject(&bm); t oDi70o  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); tb oQn~&4  
 tdc.SelectObject(pOld); ?5ZvvAi  
 BITMAP btm; Q\IViM  
 bm.GetBitmap(&btm); 2`;XcY4A  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^1c7\"{  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ^{IZpT3  
 BITMAPINFOHEADER bih; Op9 ^Eu%n  
 bih.biBitCount=btm.bmBitsPixel; vOCaru?~h  
 bih.biClrImportant=0; @$5~`?  
 bih.biClrUsed=0; Ebj0 {ZL  
 bih.biCompression=0; />I5,D'h  
 bih.biHeight=btm.bmHeight; VFF5 Tp  
 bih.biPlanes=1; >Ho=L)u  
 bih.biSize=sizeof(BITMAPINFOHEADER); =AzkE]   
 bih.biSizeImage=size; 'l\PL1  
 bih.biWidth=btm.bmWidth; PX^ k;  
 bih.biXPelsPerMeter=0; %=2sz>M+  
 bih.biYPelsPerMeter=0; g8'8"9:xC  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ";&PtLe  
 static int filecount=0; w0nbL^f  
 CString name; /@ g 8MUq7  
 name.Format("pict%04d.bmp",filecount++); `$JZJ!,A  
 name=m_Path+name; a]P%Y.? r  
 BITMAPFILEHEADER bfh; :epB:r  
 bfh.bfReserved1=bfh.bfReserved2=0; NWiDNK[VE}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); QaEiPn~  
 bfh.bfSize=54+size; aw lq/  
 bfh.bfOffBits=54; {W{;VJKQ2  
 CFile bf; %nq<nfDT  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8/)q$zs  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); S/pU|zV[  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); mMZrBz7r  
  bf.WriteHuge(lpData,size); NRG~ya >  
  bf.Close(); yyu-y0_  
  nCount++; BHgs,  
 } Kc^ctAk7;  
 GlobalFreePtr(lpData); }D)eS |B  
 if(nCount==1) Oz_CEMcy  
  m_Number.Format("%d picture captured.",nCount); rmvrv.$3  
 else RWM~7^JA  
  m_Number.Format("%d pictures captured.",nCount); .i_ gE5  
  UpdateData(FALSE); [X@{xF^vBQ  
} nSSJl  
#WG;p(?:  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $(0<T<\  
{ B[8 RBTsA  
 if(pMsg -> message == WM_KEYDOWN) AriV4 +  
 { e'G3\h}#  
  if(pMsg -> wParam == VK_ESCAPE) ]x8Y]wAU&{  
   return TRUE; $$4flfx  
  if(pMsg -> wParam == VK_RETURN) B&59c*K  
   return TRUE; hB\BFVUSn/  
 } x2I|iA=  
 return CDialog::PreTranslateMessage(pMsg); B$JPE7h@[P  
}  FO!0TyQ  
`'r]Oe  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) SV ~QH&0'  
{ g9g ] X  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ UBQtD|m\  
  SaveBmp(); (kK8 OxfF  
  return FALSE; CP"5E?dcK  
} gV':Xe  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ P*?2+.  
 CMenu pop; zTG1 0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Lnn^j#n  
 CMenu*pMenu=pop.GetSubMenu(0); ^"/TWl>jB  
 pMenu->SetDefaultItem(ID_EXITICON); Wx;%W"a  
 CPoint pt; 5$Kv%U  
 GetCursorPos(&pt); (1er?4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); q(s0dkrj  
 if(id==ID_EXITICON) vft7-|8T  
  DeleteIcon(); Y@ ;/Sf$Q  
 else if(id==ID_EXIT) F!C<^q~!  
  OnCancel(); 5f@&XwD9  
 return FALSE; TK> ~)hc}  
} r`)'Kd  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8h}1t4k  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) yswf2F  
 AddIcon(); LG("<CU  
 return res; Vn/FW?d7  
} 5?j#  
y?}<SnjP:  
void CCaptureDlg::AddIcon()  mSFA i  
{ T`I4_x  
 NOTIFYICONDATA data; (8W ?ym  
 data.cbSize=sizeof(NOTIFYICONDATA); %3HF_DNOY=  
 CString tip; +'[*ikxD=g  
 tip.LoadString(IDS_ICONTIP); XK0lv8(  
 data.hIcon=GetIcon(0); daQJ{Cd,w  
 data.hWnd=GetSafeHwnd(); fE>JoQs38  
 strcpy(data.szTip,tip); #iD`Bg!VXc  
 data.uCallbackMessage=IDM_SHELL; eVbT<9k  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; rXGaav9  
 data.uID=98; !Xq5r8]  
 Shell_NotifyIcon(NIM_ADD,&data); cSTL.QF  
 ShowWindow(SW_HIDE); [-)BI|S:  
 bTray=TRUE; iN L>TVUM  
} J?&%fI  
q?0&0  
void CCaptureDlg::DeleteIcon() H5gcP11r  
{ m{yq.H[X  
 NOTIFYICONDATA data; `,c~M  
 data.cbSize=sizeof(NOTIFYICONDATA); @GQtyl;q  
 data.hWnd=GetSafeHwnd(); .36]>8  
 data.uID=98; 1l}fX}5%I;  
 Shell_NotifyIcon(NIM_DELETE,&data); u@4khN: ^p  
 ShowWindow(SW_SHOW); &_]bzTok  
 SetForegroundWindow(); u$"Ew^C  
 ShowWindow(SW_SHOWNORMAL); P$/Y9o  
 bTray=FALSE; 2.a{,d  
} cm>+f^4?n  
HIlTt  
void CCaptureDlg::OnChange() w (odgD  
{ ~\O,#j`_  
 RegisterHotkey(); %L  nG^L  
} Ee$F]NA  
` P*PCiZos  
BOOL CCaptureDlg::RegisterHotkey() !3*%-8bp  
{ v@:m8Y(t  
 UpdateData(); !@)tkhP  
 UCHAR mask=0; (6)X Fp&  
 UCHAR key=0; '"V]>)  
 if(m_bControl) =A/$[POr  
  mask|=4; "!o|^nN,  
 if(m_bAlt) 2 3A)^j  
  mask|=2; rWuqlx#  
 if(m_bShift) RWGAxq`9f  
  mask|=1; A^7}:[s20  
  key=Key_Table[m_Key.GetCurSel()]; ~:UAL}b{\~  
 if(bRegistered){ _&$nJu  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); s#(<zBZ9p#  
  bRegistered=FALSE; tHH @[E+h  
 } 1KI5tf>>p  
 cMask=mask; )!l1   
 cKey=key; >td\PW~X  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \r\wqz7  
 return bRegistered; q{Gf@  
} k NUNh[  
E vD g{M}  
  四、小结 D^H4]7wG@  
TI637yqCU  
  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
温馨提示:欢迎交流讨论,请勿纯表情、纯引用!
认证码:
验证问题:
10+5=?,请输入中文答案:十五