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
  • 6313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: ^{:[^$f:l  
  LqH?3):  
  一、实现方法 q0xE&[C[M  
p%i .(A  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: aO;Q%]VL'  
lj%;d'  
#pragma data_seg("shareddata") [s& y_[S  
HHOOK hHook =NULL; //钩子句柄 CH|g   
UINT nHookCount =0; //挂接的程序数目 N'q/7jOy  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fjzr8vU}C  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 zv3<i (  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 4<!}4   
static int KeyCount =0; yO69p  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Zzzi\5&gU  
#pragma data_seg() PSt|!GST  
TBLk+AR  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ;/]c^y  
=z7 Ay  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: n ;$}pg ~  
pRyS8'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .bl/At3A  
cKey,UCHAR cMask)  Q-3J0=  
{ }F9?*2\/  
 BOOL bAdded=FALSE; f+(w(~O  
 for(int index=0;index<MAX_KEY;index++){ 5la]l  
  if(hCallWnd[index]==0){ rea}Uq+po  
   hCallWnd[index]=hWnd; [&k& $04_  
   HotKey[index]=cKey; d+wNGN  
   HotKeyMask[index]=cMask; R;I-IZS:  
   bAdded=TRUE; P+ h<{%:*  
   KeyCount++; l2_E6U"  
   break; 5&7?0h+I  
  } fn"jYSy  
 } ~O3uje_  
 return bAdded; "NI>HO.U  
} d4rJ ?qw  
//删除热键 "}Sid+)<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f0s<Y  
{ ^IegR>  
 BOOL bRemoved=FALSE; OA5md9P;d  
 for(int index=0;index<MAX_KEY;index++){ T;vPR,]rz  
  if(hCallWnd[index]==hWnd){ QSQ\@h;E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k>@^M]%  
    hCallWnd[index]=NULL; $1`t+0^k  
    HotKey[index]=0; lKD<  
    HotKeyMask[index]=0; mf_ 9O  
    bRemoved=TRUE; L.~]qs|G/K  
    KeyCount--; 7D1`^,?  
    break; u\\niCNA  
   } mJ#B<I'  
  } j~<iTLM  
 } GA@Q:n8UuR  
 return bRemoved; x>/@Z6Wxz  
} nJ`a1L{N  
p!5JO4F$  
OKH~Y-%<  
  DLL中的钩子函数如下:  /o3FK  
y8 u)Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) < $/Yw   
{ sA7K ;J})  
 BOOL bProcessed=FALSE; }u$a PS<$!  
 if(HC_ACTION==nCode) /3HWP`<x  
 { [T&y5"@  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 UyfIAC$S  
   switch(wParam) ^)K[1]"uM  
   {  /bj`%Q.n  
    case VK_MENU: C4K&flk]  
     MaskBits&=~ALTBIT; IpVwnNj!}  
     break; [A/+tv  
    case VK_CONTROL: Gb)iB  
     MaskBits&=~CTRLBIT; Ud?d.  
     break; ~.=!5Ry  
    case VK_SHIFT: z.F+$6  
     MaskBits&=~SHIFTBIT; <'yC:HeAwD  
     break; ]3cf}Au  
    default: //judge the key and send message 0a-:x4  
     break; u~Cqdr5 \l  
   } _|#|mb4Fe  
   for(int index=0;index<MAX_KEY;index++){ \.-y LS.  
    if(hCallWnd[index]==NULL) g?Ty5~:lq  
     continue; n \NDi22  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bI0+J)  
    { ~Am %%$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 17i@GnbNb  
     bProcessed=TRUE; {Ao^3vB  
    } "f$A0RL  
   } OehB"[;+  
  } %Q4w9d  
  else if((lParam&0xc000ffff)==1){ //有键按下 .VV!$; FB  
   switch(wParam) e?fjX-  
   { KFrmH  
    case VK_MENU: AxQ/  
     MaskBits|=ALTBIT; yodrX&"  
     break; OnJSu z>-  
    case VK_CONTROL: P+l^Ep8P  
     MaskBits|=CTRLBIT; +:8YMM#9V  
     break; 3W WxpTU  
    case VK_SHIFT: >R0j<:p :  
     MaskBits|=SHIFTBIT; h$h`XBVZe;  
     break; f }e7g d]M  
    default: //judge the key and send message enepAu-="p  
     break; O!yn `< l  
   } ^^(ZK 6d  
   for(int index=0;index<MAX_KEY;index++){ Wm/k(R`O<  
    if(hCallWnd[index]==NULL) akoKx)(<  
     continue; ZdzGJ[$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'vClZGQ1  
    { mTbPz Z4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); LKG|S<s  
     bProcessed=TRUE; YZJP7nN  
    } RH0a\RC!G  
   } +N!{(R:"v}  
  } he6) L6T  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Ct33S+y  
   for(int index=0;index<MAX_KEY;index++){ '0?E|B]Cp%  
    if(hCallWnd[index]==NULL) bHG>SW\]`?  
     continue; ?':'zT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) t;6/bT-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cK/odOi  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 51usiOq  
   } ZU6a   
  } L zy|<:K+$  
 } MM7gMAA.mz  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); o8"xoXK5xf  
} )&-+:u0  
3xY]Lqwv  
  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: _P+|tW1  
W%:zvqg v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f>PU# D@B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7 {<lH%Tn  
(J#3+I  
  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: 4 ETVyK|  
nwVtfsb  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *a@UV%u  
{ )9,"~P2[R  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 9_$Odc%]  
 { `Nr7N#g+u  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 r}bKVne  
  SaveBmp(); 6U]7V  
  return FALSE; 6<6_W#  
 } V&85<Y%Nl|  
 …… //其它处理及默认处理 s*Ll\#  
} ],4LvIPD  
s|oU$?eA  
Wn5]2D\vkT  
  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。 OkXOV   
\aozecpC`  
  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。 bp_@e0  
@e/dQ:Fb  
  二、编程步骤 g?sFmD  
p^!p7B`qe.  
  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"; fba3aId[  
omu&:) g  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; o~ed0>D-LS  
nrS_t y  
  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; G}*B`m  
:4d7%q  
  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; 9x\G(w  
@TDcj~oR ?  
  5、 添加代码,编译运行程序。 eU0-_3gN_  
[5-5tipvWp  
三、程序代码 ?i"FdpW  
pj6Cvq4bD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL M IJ~j><L  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Sq QB>;/p  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ I&c#U+-A'  
#if _MSC_VER > 1000 on$a]zx'@  
#pragma once nm.d.A/]Z  
#endif // _MSC_VER > 1000 %{"STbO#>  
#ifndef __AFXWIN_H__ 29oEkaX2o  
#error include 'stdafx.h' before including this file for PCH ]Re<7_xt  
#endif 9OBPFF  
#include "resource.h" // main symbols &9>d  
class CHookApp : public CWinApp :z7!X.*  
{ > %,tyJ~  
 public: 25r=Xv  
  CHookApp(); ^=j$~*(LmX  
  // Overrides @UX`9]-P  
  // ClassWizard generated virtual function overrides l(W3|W#P  
  //{{AFX_VIRTUAL(CHookApp) ^8)d8?}  
 public: ;f\0GsA#  
  virtual BOOL InitInstance(); $9/r*@bu8d  
  virtual int ExitInstance(); Uan ;}X7@  
  //}}AFX_VIRTUAL WD:5C3;  
  //{{AFX_MSG(CHookApp) \kx9V|A'  
  // NOTE - the ClassWizard will add and remove member functions here. )C[8#Q-:  
  // DO NOT EDIT what you see in these blocks of generated code ! *0@e_h  
  //}}AFX_MSG <G={V fr  
  DECLARE_MESSAGE_MAP() 2#!D"F  
}; >8Y >B)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); I5mS!m/X  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LCt m@oN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JT+P>\\];'  
BOOL InitHotkey(); gd*\,P  
BOOL UnInit(); })Jp5vv  
#endif %Vq@WF  
WW.=>]7;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. sx;1V{|g  
#include "stdafx.h" e=U7w7(s9  
#include "hook.h" /dAIg1ra  
#include <windowsx.h> P;GUGG*W  
#ifdef _DEBUG g?ft;kR6S  
#define new DEBUG_NEW b3ZPlLx6  
#undef THIS_FILE ZHT.+X:_  
static char THIS_FILE[] = __FILE__; d 9|u~3  
#endif F9hCT)  
#define MAX_KEY 100 <m!\Ma  
#define CTRLBIT 0x04 L_(|5#IDw  
#define ALTBIT 0x02 UX6-{ RP  
#define SHIFTBIT 0x01 KM6r}CDHs  
#pragma data_seg("shareddata") OtJS5A  
HHOOK hHook =NULL; F 1BPzRo`  
UINT nHookCount =0; 6gv.n  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey : v]< h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT B}vI<?c  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey rei<{woX  
static int KeyCount =0; J;qHw[6  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift {x+jFj.  
#pragma data_seg() j=7]"%  
HINSTANCE hins; 3E#acnqn*  
void VerifyWindow(); G2mv6xK'  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) oD.f/hi0|  
//{{AFX_MSG_MAP(CHookApp) {2,V3*NF  
// NOTE - the ClassWizard will add and remove mapping macros here. (t <Um Vd  
// DO NOT EDIT what you see in these blocks of generated code! >q`G?9d2  
//}}AFX_MSG_MAP QDU^yVa_  
END_MESSAGE_MAP() : "UBeo<Z  
yd2ouCUV  
CHookApp::CHookApp() B!,})F$x  
{ $]O\Ryf6  
 // TODO: add construction code here, !=ZbBUJF  
 // Place all significant initialization in InitInstance ^uYxeQY[  
} N-suBRnW  
#CM2FN:W  
CHookApp theApp; h4V.$e<T&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) l?ofr*U&-x  
{ JMoWA0f  
 BOOL bProcessed=FALSE; L|v1=qNH4  
 if(HC_ACTION==nCode) Zf|f $1-  
 { (HY|0Bgr  
  if((lParam&0xc0000000)==0xc0000000){// Key up }lhJt|qc  
   switch(wParam) hd\iW7  
   { X _XqT  
    case VK_MENU: 55Jk "V#8  
     MaskBits&=~ALTBIT; Q+S>nL!*#1  
     break; )5B90[M|t  
    case VK_CONTROL: ) ~X\W\  
     MaskBits&=~CTRLBIT; pmfyvkLS  
     break; FX\ -Y$K  
    case VK_SHIFT: m@OgT<E]_  
     MaskBits&=~SHIFTBIT; c" yf>0  
     break; >zXw4=J  
    default: //judge the key and send message V]IS(U(  
     break; ndN 8eh:OR  
   } P\SE_*&  
   for(int index=0;index<MAX_KEY;index++){ 9v^MZ ^Y{  
    if(hCallWnd[index]==NULL) 8%Pjx7'<  
     continue; zL1H[}[z+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2OEO b,`  
    { #qHo+M$"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *Bc= gl$  
     bProcessed=TRUE; RzXxnx)]q  
    } R:=i/P/  
   } X)`? P*[  
  } nsYS0  
  else if((lParam&0xc000ffff)==1){ //Key down V+_L9  
   switch(wParam) ;[&g`%-H<  
   { a Z ^SK|E  
    case VK_MENU: 7|\[ipVX:3  
     MaskBits|=ALTBIT; `XQM)A  
     break; 74QWGw`,  
    case VK_CONTROL: ]ZZ7j  
     MaskBits|=CTRLBIT; JTrxh]  
     break; j&ddpS(s  
    case VK_SHIFT: 4u A ;--j  
     MaskBits|=SHIFTBIT; g {wDI7"<q  
     break; $KKrl  
    default: //judge the key and send message ]x! vPIyq  
     break; ?$9C[Kw`  
   } co#%~KqMu  
   for(int index=0;index<MAX_KEY;index++) T5o9pm D  
   { BT >8  
    if(hCallWnd[index]==NULL) Z3=t"  
     continue; Es1Yx\/:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >AV?g8B;  
    { -49OE*uF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _<&IpT{w+  
     bProcessed=TRUE; bNj| GIf  
    } tvZpm@1  
   } az\ ;D\\  
  } &!a[rvtZ+  
  if(!bProcessed){ Jt@7y"<  
   for(int index=0;index<MAX_KEY;index++){ gQh;4v  
    if(hCallWnd[index]==NULL) p\~ lPXK  
     continue; \%f4)Qb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 27}k63\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S-g`rTx  
   } }B^KV#_{S  
  } L9&Z?$6J_p  
 } {^5r5GB=*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); CZt)Q4  
} >i-cR4=LL{  
q#F;GD  
BOOL InitHotkey() c(i-~_  
{ U5%EQc-"P  
 if(hHook!=NULL){ lhKd<Y"  
  nHookCount++; 3@_je)s  
  return TRUE; VWaI!bK  
 } UIIR$,XB  
 else 3L/>=I{5  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); XQ.JzzY$  
  if(hHook!=NULL) j 8YMod=  
   nHookCount++; % =br-c  
  return (hHook!=NULL);  Hi|'  
} %BC*h}KGH  
BOOL UnInit() +kmPQdO;*/  
{ x/R|i%u-s  
 if(nHookCount>1){ l0 r Zril  
  nHookCount--; -%NT)o  
  return TRUE; ma?$@ ]`k  
 } r. =_=V/t  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }2-{4JIq}  
 if(unhooked==TRUE){ 2>_6b>9]  
  nHookCount=0; 7JQ5OC3  
  hHook=NULL; mN!>BqvN  
 } ;N6L`|  
 return unhooked; Y6,< j|  
} =AUR]&_B  
;spuBA)[X  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -6aGcPq  
{ 5a&[NN  
 BOOL bAdded=FALSE; 25o + ?Y<  
 for(int index=0;index<MAX_KEY;index++){ A!x_R {,yH  
  if(hCallWnd[index]==0){ N yFa2Ihd  
   hCallWnd[index]=hWnd; pg;agtI  
   HotKey[index]=cKey; ehoDWO]S  
   HotKeyMask[index]=cMask; TY],H=  
   bAdded=TRUE; Nj@k|_1  
   KeyCount++; (G*--+Gn  
   break; gQCkoQi:j  
  } ,g;~:  
 } <U (gjX  
 return bAdded; +MIDq{B  
} 3W5|Y@0  
0bVtku K;G  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) a{mtG{Wc  
{ VX2 KE@  
 BOOL bRemoved=FALSE; 1.4]T, `  
 for(int index=0;index<MAX_KEY;index++){ b,cA mZ  
  if(hCallWnd[index]==hWnd){ 'RC(ss1G  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =;9Wh!{  
    hCallWnd[index]=NULL; Y7zg  
    HotKey[index]=0; Nc ,"wA  
    HotKeyMask[index]=0; 2kp.Ljt@  
    bRemoved=TRUE; kVCS FF*  
    KeyCount--; |[)t4A"}  
    break; FAzshR  
   } k9vr6We'  
  }  I QS|  
 } lc,{0$ 1<  
 return bRemoved; Hl8-1M$&  
} !vHnMY~AG  
<=l!~~%  
void VerifyWindow() qH: ` O%,  
{ snK$? 9vh  
 for(int i=0;i<MAX_KEY;i++){ Zm >Q-7r9  
  if(hCallWnd!=NULL){ 4/&Us  
   if(!IsWindow(hCallWnd)){ ><mZOTn e;  
    hCallWnd=NULL; TxoMCN?7c  
    HotKey=0; be|k"s|6)  
    HotKeyMask=0; xa[<k >r3  
    KeyCount--; (_^g:>)Cs  
   } hc4<`W{  
  } b'pbf  
 } RFU(wek  
} YR@@:n'TP  
V7G?i\>  
BOOL CHookApp::InitInstance() :z_D?UQ  
{ EW%%W6O6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); s/Fc7V!;  
 hins=AfxGetInstanceHandle(); Z,M?!vK  
 InitHotkey(); Py^F},?J  
 return CWinApp::InitInstance(); +y!dU{L^  
} iW(HOsA  
sU^2I v\%  
int CHookApp::ExitInstance() M`*B/Fh 2  
{ KdHR.;*  
 VerifyWindow(); s4<[f%^  
 UnInit(); 9x0B9&  
 return CWinApp::ExitInstance(); ( \{9W  
} r  /63  
mT <4@RrB  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2 :u4~E3  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 16_HO%v->  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #o SQWC=T  
#if _MSC_VER > 1000 bHH{bv~Z  
#pragma once BC ]^BKP  
#endif // _MSC_VER > 1000 A,ttn5Sh?  
^0_*AwIcN  
class CCaptureDlg : public CDialog bg[k8*.:F  
{ 'Cd8l#z7  
 // Construction IAf,TKfe  
 public: `r e]Q0IO  
  BOOL bTray; @vh3S+=M  
  BOOL bRegistered; \$}xt`6p  
  BOOL RegisterHotkey(); OD-CU8X9  
  UCHAR cKey; B q+RFo  
  UCHAR cMask; ^n!{ vHz  
  void DeleteIcon(); iJv4%|9  
  void AddIcon(); Z $ Fh4  
  UINT nCount; >*(4evU  
  void SaveBmp(); UK*+EEv  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ir|Q2$W2^c  
  // Dialog Data {9vvj  
  //{{AFX_DATA(CCaptureDlg) dd>|1'-]  
  enum { IDD = IDD_CAPTURE_DIALOG }; :{pvA;f  
  CComboBox m_Key; []/=!?5B  
  BOOL m_bControl; y8HLrBTza  
  BOOL m_bAlt; {";5n7<<)  
  BOOL m_bShift;  LKieOgX  
  CString m_Path; %H75u 6  
  CString m_Number; AR\>P  
  //}}AFX_DATA 'C)^hj.  
  // ClassWizard generated virtual function overrides '}dlVf  
  //{{AFX_VIRTUAL(CCaptureDlg) pN6!IxN$  
 public: zhY V M Q  
  virtual BOOL PreTranslateMessage(MSG* pMsg); s\_-` [B0  
 protected: \Si@t{`O  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tQ_;UQlX  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); { :xINQ=}D  
  //}}AFX_VIRTUAL IzF7W?k  
  // Implementation !/znovoD  
 protected: 6e&Y%O'8  
  HICON m_hIcon; {>tgNW>)  
  // Generated message map functions h@=H7oV7k  
  //{{AFX_MSG(CCaptureDlg) 1dh_"/  
  virtual BOOL OnInitDialog();  *>j u1f  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); xRpL\4cs  
  afx_msg void OnPaint(); 'uBXSP#  
  afx_msg HCURSOR OnQueryDragIcon(); 767xCP  
  virtual void OnCancel(); z)xGZ*{=  
  afx_msg void OnAbout(); H$au02dpU  
  afx_msg void OnBrowse(); ks< gSCB  
  afx_msg void OnChange(); b)J(0,9`G"  
 //}}AFX_MSG kD dY i7g>  
 DECLARE_MESSAGE_MAP() 1,=U^W.G  
}; `=Pn{JaD  
#endif m663%b(5>  
u`dWU}m)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file y K)7%j!  
#include "stdafx.h" 3GUO   
#include "Capture.h" h.>6>5$n  
#include "CaptureDlg.h" GQhzQM1HS  
#include <windowsx.h> :A $%5;-kO  
#pragma comment(lib,"hook.lib") |C?<!6.QmV  
#ifdef _DEBUG <use+C2  
#define new DEBUG_NEW ke_Dd?  
#undef THIS_FILE 8.HqQ:?&2t  
static char THIS_FILE[] = __FILE__; ^$f} s,09  
#endif fT [JU1  
#define IDM_SHELL WM_USER+1 2c@4<kyfP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /f~ V(DK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); | VPs5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; '<5Gf1 @|  
class CAboutDlg : public CDialog ]S9~2;2^,  
{ kKAK;JQ  
 public: <\!+J\YTA  
  CAboutDlg(); J7W]Str  
  // Dialog Data +C1/02ZJ  
  //{{AFX_DATA(CAboutDlg) eyBLgJt8P  
  enum { IDD = IDD_ABOUTBOX }; pqFgi_2m  
  //}}AFX_DATA h~{TCK+I  
  // ClassWizard generated virtual function overrides (.4mX t  
  //{{AFX_VIRTUAL(CAboutDlg) wG [X*/v  
 protected: EL$l . v  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =Y#)c]`  
  //}}AFX_VIRTUAL %$ |=_K)Ks  
  // Implementation ~f0Bu:A)  
 protected: NF&R}7L  
  //{{AFX_MSG(CAboutDlg) gd^1c}UZX  
  //}}AFX_MSG >M[wh>  
  DECLARE_MESSAGE_MAP() M%pxv6?""{  
}; GqBZWmAB  
$HT {}^B  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) e8 4[B.  
{ [}q6bXM*  
 //{{AFX_DATA_INIT(CAboutDlg) ;W,XP#{W  
 //}}AFX_DATA_INIT \M(0@#-$C  
} s9svuFb  
~K]5`(KV  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) z[Xs=S!]I  
{ E9TWLB5A)(  
 CDialog::DoDataExchange(pDX); P,lKa.  
 //{{AFX_DATA_MAP(CAboutDlg) *t.L` G  
 //}}AFX_DATA_MAP <x@brXA  
} If>k~aL7I  
,0O9!^  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 'AU(WHf  
 //{{AFX_MSG_MAP(CAboutDlg) N-EVH e'}6  
 // No message handlers {jO:9O @  
 //}}AFX_MSG_MAP :S'P lH  
END_MESSAGE_MAP() p&~8N#I#  
Mu$9#[/  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 4<g,L;pUU  
: CDialog(CCaptureDlg::IDD, pParent) .<5 66g}VP  
{ BC0SSR@e  
 //{{AFX_DATA_INIT(CCaptureDlg) 3tY \0y9  
  m_bControl = FALSE; H!mNHY_fA  
  m_bAlt = FALSE; kbS+ 3#+  
  m_bShift = FALSE; ua[ d  
  m_Path = _T("c:\\"); H"lq!C`  
  m_Number = _T("0 picture captured."); kSoa '  
  nCount=0; }bIbMEMn  
  bRegistered=FALSE; ee}&~%  
  bTray=FALSE; E uxD,(  
 //}}AFX_DATA_INIT 89ivyv;]U  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 dlkxA^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); },G6IuH%  
} vpu20?E>5z  
|2w,Np-  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,?g}->ZB  
{ 5/4N  Y  
 CDialog::DoDataExchange(pDX); N9@@n:JT  
 //{{AFX_DATA_MAP(CCaptureDlg) MebL Y $&8  
  DDX_Control(pDX, IDC_KEY, m_Key); .vHSKd{  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); TY}9;QL:  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ' k[d&sR  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +EG?8L,z  
  DDX_Text(pDX, IDC_PATH, m_Path); [)UL}vAO\q  
  DDX_Text(pDX, IDC_NUMBER, m_Number); VsEMF i=  
 //}}AFX_DATA_MAP F;$z[z  
} TpXbJ]o9  
j"o8]UT/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) s8;/'?K  
//{{AFX_MSG_MAP(CCaptureDlg) t;X  !+  
 ON_WM_SYSCOMMAND() #rnO=N8  
 ON_WM_PAINT() gI<e=|J6w  
 ON_WM_QUERYDRAGICON() -DD2   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) /NRdBN  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) L-Qc[L  
 ON_BN_CLICKED(ID_CHANGE, OnChange) s/#L?[YH  
//}}AFX_MSG_MAP Xm,w.|dx  
END_MESSAGE_MAP() 1KwUp0% &  
iV<4#aBg  
BOOL CCaptureDlg::OnInitDialog() 1_$y bftS  
{  _0^f  
 CDialog::OnInitDialog(); =_~bSEqyRI  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); :uwB)G  
 ASSERT(IDM_ABOUTBOX < 0xF000); sk* AlSlM  
 CMenu* pSysMenu = GetSystemMenu(FALSE); j6x1JM  
 if (pSysMenu != NULL) n<RvL^T=  
 { m/}(dT;  
  CString strAboutMenu;  g=W1y  
  strAboutMenu.LoadString(IDS_ABOUTBOX); K[} 5bjh>  
  if (!strAboutMenu.IsEmpty()) k~ Z9og  
  { :: IAXGH)  
   pSysMenu->AppendMenu(MF_SEPARATOR); S5B12P  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); i2$7nSQ9  
  } x?T.ItW:K  
 } JAPiR=  
 SetIcon(m_hIcon, TRUE); // Set big icon L[v-5u)  
 SetIcon(m_hIcon, FALSE); // Set small icon nO-1^HUl  
 m_Key.SetCurSel(0); $&IF#uDf  
 RegisterHotkey(); ]6JI((  
 CMenu* pMenu=GetSystemMenu(FALSE); JBzRL"|  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ig G8L  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Y:UDte[Lb  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ErZYPl  
 return TRUE; // return TRUE unless you set the focus to a control 3%`asCW$  
} ?+6w8j%\  
`Hj{XIOx  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) -jN:~.  
{ PEA<H0  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) j;%RV)e  
 { ;&="aD  
  CAboutDlg dlgAbout; }t.J;(ff:  
  dlgAbout.DoModal(); Iu(j"b#  
 } eYSVAj  
 else 79}voDFd  
 { QN!.~>  
  CDialog::OnSysCommand(nID, lParam); 1 /@lZ  
 } g+CTF67  
} ::'DWD1  
uh,~Cv XU]  
void CCaptureDlg::OnPaint() N0U6N< w  
{ T\}?  
 if (IsIconic()) /m#!<t7  
 { 9hoTxWpmy  
  CPaintDC dc(this); // device context for painting ?[Gj?D.Wc  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ruqx #]-  
  // Center icon in client rectangle Um4$. BKD  
  int cxIcon = GetSystemMetrics(SM_CXICON); snU $Na3  
  int cyIcon = GetSystemMetrics(SM_CYICON); & QO9/!  
  CRect rect; Y"eR&d  
  GetClientRect(&rect); d:|(l^]{r  
  int x = (rect.Width() - cxIcon + 1) / 2; V* :Q~ ^  
  int y = (rect.Height() - cyIcon + 1) / 2; DdAs]e|D[  
  // Draw the icon [}p/pj=  
  dc.DrawIcon(x, y, m_hIcon); e* 2ay1c  
 } OXT'$]p.*  
 else PH,MZ"Z%  
 { N%3 G\|~Q  
  CDialog::OnPaint(); bBwMx{iNNz  
 } ~lg1S  
} <<Zt.!hS  
u+ wKs`   
HCURSOR CCaptureDlg::OnQueryDragIcon() (WoKrd.!  
{ z>n<+tso  
 return (HCURSOR) m_hIcon; ZAK NyA2  
} gW0{s[}T  
ZmT N  
void CCaptureDlg::OnCancel() s]=bg+v?j  
{ M mihWD02  
 if(bTray) X{8/]'(  
  DeleteIcon(); '3n?1x  
  CDialog::OnCancel(); p xj}%LH  
} f[S$ Gu4-  
,ypD0Q   
void CCaptureDlg::OnAbout() 4 VPJv>^  
{ u+U '|6)E  
 CAboutDlg dlg; ,2*^G;J1  
 dlg.DoModal(); L\O}q  
} /3]b!lFZZ  
jGp|:!'w  
void CCaptureDlg::OnBrowse() .JkcCEe{G  
{ D7'P^*4_B  
 CString str; *ud"?{)Z  
 BROWSEINFO bi; lQ t&K1m  
 char name[MAX_PATH]; jg,oGtRz  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); dV~yIxD}C*  
 bi.hwndOwner=GetSafeHwnd(); C`)n\?:Sth  
 bi.pszDisplayName=name; d-cK`pSB  
 bi.lpszTitle="Select folder"; ="M7F0k  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 0O_acO 4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); n aQ0TN,  
 if(idl==NULL) *{/L7])gm  
  return; /Ah|Po  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ,{KjVv<  
 str.ReleaseBuffer(); *jAw  
 m_Path=str; vocXk_  
 if(str.GetAt(str.GetLength()-1)!='\\') >n`!S`)9{  
  m_Path+="\\"; C^dnkuA  
 UpdateData(FALSE); Gp<7i5  
} ;p$KM-?2D  
k@,&'imx  
void CCaptureDlg::SaveBmp() Y~R['u,  
{ m{~p(sQL  
 CDC dc; &s]wf  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); R^nkcLFb/q  
 CBitmap bm; zVSbEcr,C~  
 int Width=GetSystemMetrics(SM_CXSCREEN); :yLSLN  
 int Height=GetSystemMetrics(SM_CYSCREEN); 6f$h1$$)^  
 bm.CreateCompatibleBitmap(&dc,Width,Height); O@n1E'S/  
 CDC tdc; /M Hml0u  
 tdc.CreateCompatibleDC(&dc); M*& tVG   
 CBitmap*pOld=tdc.SelectObject(&bm); q;XO1Se  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); z j[/~ I  
 tdc.SelectObject(pOld); kX\\t.nH  
 BITMAP btm; jl!rCOLt4  
 bm.GetBitmap(&btm); ?2;gmZd7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; i]qVT)j  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); upD 2vtU  
 BITMAPINFOHEADER bih; ;k<n}shD  
 bih.biBitCount=btm.bmBitsPixel; Hg~O0p}[  
 bih.biClrImportant=0; <G5d{rKZ  
 bih.biClrUsed=0; Z(' iZ'55F  
 bih.biCompression=0; M-  f)\`I  
 bih.biHeight=btm.bmHeight; 0Q2P"1>KT/  
 bih.biPlanes=1; E0g` xf 6c  
 bih.biSize=sizeof(BITMAPINFOHEADER); _~^JRC[q  
 bih.biSizeImage=size; |.]:#)^X?  
 bih.biWidth=btm.bmWidth; d"7l<y5  
 bih.biXPelsPerMeter=0; ]#UyYgPk  
 bih.biYPelsPerMeter=0; wEMh !jAbv  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); *1Q~/<W  
 static int filecount=0; dHE\+{K%-  
 CString name; LuLnmnmB  
 name.Format("pict%04d.bmp",filecount++); %*>ee[^L ,  
 name=m_Path+name; \~3g*V  
 BITMAPFILEHEADER bfh; jz\LI  
 bfh.bfReserved1=bfh.bfReserved2=0; yNw YP%"y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); #i#4h<R  
 bfh.bfSize=54+size; @0XqUcV  
 bfh.bfOffBits=54; [sM~B  
 CFile bf; qre.^6x  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =bVaB<!  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DOr()X  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); '+!@c&d#%o  
  bf.WriteHuge(lpData,size); ]yTMWIx#  
  bf.Close(); >&1MD}  
  nCount++; q#8$@*I  
 } H*l2,0&W  
 GlobalFreePtr(lpData); 9M$=X-  
 if(nCount==1) "y%S.ipWG  
  m_Number.Format("%d picture captured.",nCount); 5#v  
 else /uTU*Oe  
  m_Number.Format("%d pictures captured.",nCount); B&tU~  
  UpdateData(FALSE); fgb%SIi?  
} ~"<AYJlO  
pH?tr  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) MZpG1  
{ rv(Qz|K@  
 if(pMsg -> message == WM_KEYDOWN) /Dn,;@ZwAi  
 { U%swqle4  
  if(pMsg -> wParam == VK_ESCAPE) +m> %(?=A  
   return TRUE; t+R8{9L-  
  if(pMsg -> wParam == VK_RETURN) KUr}?sdz  
   return TRUE; R'#[}s  
 } ;8Z\bHQ>  
 return CDialog::PreTranslateMessage(pMsg); N8<Wm>GLX~  
} 7?@s.Sz|fV  
I?) .D?o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C *\ =Q  
{ L*A9a  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 1^bI9 /  
  SaveBmp(); 8s,B,s.  
  return FALSE; V b=Oz  
} g;bfi{8s_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ H.8f-c-4we  
 CMenu pop; JN{.-k4Ha  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); g$++\%k&  
 CMenu*pMenu=pop.GetSubMenu(0); i+ I%]  
 pMenu->SetDefaultItem(ID_EXITICON); ?a8 o.&`l  
 CPoint pt; Kr$ w"]  
 GetCursorPos(&pt); CM; r\,o  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); G0Q8"]  
 if(id==ID_EXITICON) ]Zfg~K(  
  DeleteIcon(); REyk,s2"6  
 else if(id==ID_EXIT) @O;gKFx  
  OnCancel(); &^R0kCF`  
 return FALSE; qO yg&]7  
} P= e3f(M2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =Q % F~  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *c\:ogd  
 AddIcon(); D[.;-4"_  
 return res; {Z>OAR#   
} X8TwMt  
8 |2QJ  
void CCaptureDlg::AddIcon() ";jj`  
{ \r_-gn'1b  
 NOTIFYICONDATA data; &ukYTDM  
 data.cbSize=sizeof(NOTIFYICONDATA); k<mfBNvuo  
 CString tip; ,tdV-9N[O  
 tip.LoadString(IDS_ICONTIP); UjNe0jt% s  
 data.hIcon=GetIcon(0); wS Ty2Oyo;  
 data.hWnd=GetSafeHwnd(); _m;#+`E  
 strcpy(data.szTip,tip); Vb0((c%&  
 data.uCallbackMessage=IDM_SHELL; gbP]!d:I  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Ax D&_GT  
 data.uID=98; kPN:m ow  
 Shell_NotifyIcon(NIM_ADD,&data); CJ*8x7-t  
 ShowWindow(SW_HIDE); Z J:h]  
 bTray=TRUE; YT)jBS~&  
} O|t@p=]  
j@jaFsX |  
void CCaptureDlg::DeleteIcon() NaeG2>1  
{ x|#R$^4CY  
 NOTIFYICONDATA data; JXG%Cx!2}  
 data.cbSize=sizeof(NOTIFYICONDATA); S#IlWU  
 data.hWnd=GetSafeHwnd(); Cr?|bDv}o  
 data.uID=98; !J3dlUFRO  
 Shell_NotifyIcon(NIM_DELETE,&data); qpo3b7(N  
 ShowWindow(SW_SHOW); #nQZ/[|  
 SetForegroundWindow(); aCu 8 D!  
 ShowWindow(SW_SHOWNORMAL); \2q!2XWgK  
 bTray=FALSE; ^Ge3"^x1  
} -)biSU,  
N5>ioJj  
void CCaptureDlg::OnChange() by 'P}  
{ 9oOr-9t3  
 RegisterHotkey(); _*d8:|qw  
} o!q3+Pp;}  
D4e*Wwk  
BOOL CCaptureDlg::RegisterHotkey() [O) Q\|k  
{ 9M3XHj  
 UpdateData(); F iZe4{(p  
 UCHAR mask=0; -YF]k}|  
 UCHAR key=0; w +QXSa_D  
 if(m_bControl) ^_6.*Mvx  
  mask|=4; sEpY&6*  
 if(m_bAlt) Eiqx1ZM  
  mask|=2; Igowz7  
 if(m_bShift) Z`L-UQJ .  
  mask|=1; huj 6Ysr  
  key=Key_Table[m_Key.GetCurSel()]; 9i hB;m'C)  
 if(bRegistered){ H_*;7/&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); q*`1<9{H  
  bRegistered=FALSE; 7(RtPL pZ  
 } `Sh#> Jp  
 cMask=mask; Gqe?CM  
 cKey=key; 11%<bmJ]Q3  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g_<^kg"  
 return bRegistered; X,m6#vLK2  
} Y?cdm}:Ou  
eko$c,&jY  
  四、小结 -6wjc rTD  
&L&6 y()G  
  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