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:
-@SOo"P
'h^-t^:<>b 一、实现方法
ik2-
OM +ze}0lrEL 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:
CF|moc:; m<4s*q0\i #pragma data_seg("shareddata")
V$dJmKg HHOOK hHook =NULL; //钩子句柄
$5lW)q A UINT nHookCount =0; //挂接的程序数目
=[P%_v`` static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
~V2ajM1Z&O static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
@PQrmn6w static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
5S%C~iB static int KeyCount =0;
D3S+LV static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
R:w%2Y #pragma data_seg()
ImWXzg3@{ jCTy:q] 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
As@ihB+(\ b/sOfQ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
h; 'W :P
F0&~ ?2nG BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
(PS$e~Hs cKey,UCHAR cMask)
vpm ]9>1[ {
*o02!EYge BOOL bAdded=FALSE;
ORowx,(hX for(int index=0;index<MAX_KEY;index++){
vWU%ST if(hCallWnd[index]==0){
'7xxCj/* hCallWnd[index]=hWnd;
$D QD$ HotKey[index]=cKey;
.pZ o(* HotKeyMask[index]=cMask;
K2cq97k,d bAdded=TRUE;
8jy-z"jc KeyCount++;
3 ppuQQ break;
yS[z2:! }
>Hih }
g/IH|Z=A return bAdded;
%z*29iKlI }
)A="eW_> //删除热键
hZAG (Z BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
f49"pTw7 {
`$S^E != BOOL bRemoved=FALSE;
umQi for(int index=0;index<MAX_KEY;index++){
?}vzLgp if(hCallWnd[index]==hWnd){
Z)mX,=p if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
v9%nau4 hCallWnd[index]=NULL;
/Q?~Q0{)es HotKey[index]=0;
dgS4w@)@V; HotKeyMask[index]=0;
M^z=1YrMd bRemoved=TRUE;
i?F[||O"$ KeyCount--;
96c"I;\GXX break;
[ njx7d }
Bv^+d\*1 }
Z^s+vi }
bvl~[p$W3 return bRemoved;
PzjaCp' }
79D=d'eA 4P|$LkI G%a] j DLL中的钩子函数如下:
<tFSF%vG= um;:fT+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>SvDgeg_7f {
UqN{JG:#. BOOL bProcessed=FALSE;
\V= &&(n# if(HC_ACTION==nCode)
N~;*bvW{ {
R'zu"I if((lParam&0xc0000000)==0xc0000000){// 有键松开
\e<mSR switch(wParam)
T^~)jpkw {
%N)e91wC case VK_MENU:
VCjq3/[_ MaskBits&=~ALTBIT;
tpXa*6 break;
NCa~#i:F8 case VK_CONTROL:
BI};"y MaskBits&=~CTRLBIT;
`dDa}b break;
dFQo case VK_SHIFT:
`gt:gx>a MaskBits&=~SHIFTBIT;
AHwG<k break;
&i5:)d]L default: //judge the key and send message
qxfLfgu^ break;
~n
WsP}`n }
4otl_l(`yv for(int index=0;index<MAX_KEY;index++){
A t{U~^ if(hCallWnd[index]==NULL)
:q^R
`8;(t continue;
;{k=C2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
P+h6!=nD7 {
^|#>zCt^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
:cy>c2 bProcessed=TRUE;
Q!yb16J }
XYe~G@Q Z }
,yICNtP }
RlrZxmPV>O else if((lParam&0xc000ffff)==1){ //有键按下
id^|\hDR switch(wParam)
VJDoH {
v
dU%R\ case VK_MENU:
a9=> r MaskBits|=ALTBIT;
ob
E:kNE9 break;
OkpwhkPL5 case VK_CONTROL:
q +R*Hi MaskBits|=CTRLBIT;
abBO93f^ break;
@lS==O-`f case VK_SHIFT:
_#!U"hkH MaskBits|=SHIFTBIT;
7R,qDp S break;
D*\v0=P'? default: //judge the key and send message
R:~(Z? break;
?q_^Rj$ }
zG#wu for(int index=0;index<MAX_KEY;index++){
_.{zpF=j if(hCallWnd[index]==NULL)
`FZF2.N continue;
mQ}Gh_'ps if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
kn}zgSO {
{)xWD% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
w?*z^y@ bProcessed=TRUE;
w$j{Hp6m }
~^&R#4J }
II;Te7~ }
~.Cv
DJy if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
HY ;9?KJ' for(int index=0;index<MAX_KEY;index++){
o)&"Rf if(hCallWnd[index]==NULL)
GRT]aw continue;
?`"n3!>bS if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
8Atq,GcG SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
jH>8bXQqZ //lParam的意义可看MSDN中WM_KEYDOWN部分
&vkjmiAS }
;L~p|sF }
}3Y
<$YL"R }
537?9 return CallNextHookEx( hHook, nCode, wParam, lParam );
r<c #nD~K }
:"<e0wDu[ X&a:g 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:
M+poB+K. <~{du ?4n BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
D`pQ7 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
5qbq,#Pf :"QfF@Z{ 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:
NQX>Qh
2 ?[)yGRzO2 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Kb&V!#o) {
i%;"[M if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
p|3b/plZ {
NvJV</l6A //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
!`&\Lx_ SaveBmp();
A1),el-^5 return FALSE;
NF+<#*1 }
FI"HJwAs …… //其它处理及默认处理
f+x;: }
l%~lz[ E!J=8C.: c~imE% 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。
,%[4j9#!_ _c2WqQ-05 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!M>h@ JoZ(_Jh%m 二、编程步骤
*fnvZw? D!F 2l_ 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";
d'"r("w# 1%~[rnQ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
sw;|'N$:< 0[xpEiDx 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:IP? z] j 1*f]va 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;
`Ye8
Q5v"] 'T,c.Vj) 5、 添加代码,编译运行程序。
qMP1k7uG) G.\l qYrXU 三、程序代码
Kqg!,Sn| 6na^]t~ncm ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
-*B`] #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
?9mkRd}c #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
(R*j|HAw`X #if _MSC_VER > 1000
5~'IKcW< #pragma once
!eI2r #endif // _MSC_VER > 1000
]<XR]FHx) #ifndef __AFXWIN_H__
v^N`IJq #error include 'stdafx.h' before including this file for PCH
~"K,7sw!Y #endif
< zOi4v0 #include "resource.h" // main symbols
5Bjgr class CHookApp : public CWinApp
"m$3)7 $ {
"6CMA0R public:
/<Ld'J CHookApp();
i47j lyH // Overrides
,"\@fwy{ // ClassWizard generated virtual function overrides
S`!-Cal`n //{{AFX_VIRTUAL(CHookApp)
-!e7L>w public:
vLT0ETHg6 virtual BOOL InitInstance();
ZnW@YC#9 virtual int ExitInstance();
V}WB*bE //}}AFX_VIRTUAL
Bv6K$4 //{{AFX_MSG(CHookApp)
u92^(| // NOTE - the ClassWizard will add and remove member functions here.
xSMt*]=9 // DO NOT EDIT what you see in these blocks of generated code !
5/MKzoB //}}AFX_MSG
fv!?Ga( DECLARE_MESSAGE_MAP()
-/P\"c };
pH@]Y+W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
SaOYu &> BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
LWfqEL
- BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Gl}Qxv#$ BOOL InitHotkey();
r;&>iX4B BOOL UnInit();
U_B((Z(g #endif
Yg9joNBh @?
c2)0 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
*L4`$@l8 #include "stdafx.h"
)h{ ]k= #include "hook.h"
QDx$==Fo #include <windowsx.h>
, %9df+5k #ifdef _DEBUG
uXjP`/R| #define new DEBUG_NEW
m
ci/'b Xt #undef THIS_FILE
-7
U|a/ static char THIS_FILE[] = __FILE__;
he(A3{' #endif
`=lc<T^ #define MAX_KEY 100
z4X}O
{
#define CTRLBIT 0x04
$za8"T*I #define ALTBIT 0x02
-n 80& #define SHIFTBIT 0x01
m908jI_So #pragma data_seg("shareddata")
r!PpUwod HHOOK hHook =NULL;
^T::-pN* UINT nHookCount =0;
=O).Lx2J static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
"A$!,
PX6 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
`Ag{) static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
**3 z;58i static int KeyCount =0;
'Ft0Ry<OL static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
vw,rF`LjZ #pragma data_seg()
"VG+1r+]4 HINSTANCE hins;
%Dg0fL void VerifyWindow();
^(HUGl_ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
~`M\Ir
//{{AFX_MSG_MAP(CHookApp)
0'YG6(h // NOTE - the ClassWizard will add and remove mapping macros here.
).^}AFta // DO NOT EDIT what you see in these blocks of generated code!
?iI4x%y //}}AFX_MSG_MAP
j)C,%Ol END_MESSAGE_MAP()
H,nec<Jp o%9*B%HO/ CHookApp::CHookApp()
{(U %i\F\ {
{!t7[Ctb // TODO: add construction code here,
eq(am%3~ // Place all significant initialization in InitInstance
fk1ASV<rN }
ojvj}ln li~d?> CHookApp theApp;
/DQaGq/Ld LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
8_<4-<}P: {
hd),&qoW? BOOL bProcessed=FALSE;
( +pLA"xq if(HC_ACTION==nCode)
n!p<A.O7@ {
AP77a*@8 if((lParam&0xc0000000)==0xc0000000){// Key up
if|+EN% switch(wParam)
<Ln1pV~k {
QnZcBXI8 case VK_MENU:
|7yAX+ MaskBits&=~ALTBIT;
.ZvM ^GJb break;
![]``g2 case VK_CONTROL:
&e6CJ MaskBits&=~CTRLBIT;
&wD;SMr< break;
C{gyj}5 case VK_SHIFT:
v\m ]A1 MaskBits&=~SHIFTBIT;
Zjbc3M5 break;
a}%#*J)! default: //judge the key and send message
=|3fs7 break;
%3NqSiMs }
<B9C*M"4% for(int index=0;index<MAX_KEY;index++){
8"sb; if(hCallWnd[index]==NULL)
uwz)($~bp continue;
kY*rb_2j if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}VS5gxI1. {
yW$0\E6<r SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
N"nd*? bProcessed=TRUE;
oD<kMK }
|<:vY }
yE}}c{hSn }
4"gM<z else if((lParam&0xc000ffff)==1){ //Key down
{} 3${ switch(wParam)
!O `(JSoG {
dZi"$ g case VK_MENU:
0TQ$C-% MaskBits|=ALTBIT;
e,t(q(L break;
(M*FIX case VK_CONTROL:
h }B%
/U MaskBits|=CTRLBIT;
>}+/{(K"E| break;
`s\?w5[ case VK_SHIFT:
g!rQ4#4 MaskBits|=SHIFTBIT;
.Fdgb4>BXX break;
:2
*g~6 default: //judge the key and send message
l
c+g&f break;
9 FB19 }
=EHUR' for(int index=0;index<MAX_KEY;index++)
u(fm@+$^ {
G1 vNt7 if(hCallWnd[index]==NULL)
D#3\y*-y? continue;
rg^'S1x| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
XUz3*rfs {
bD/~eIcWL SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
3AU;>D ^5 bProcessed=TRUE;
Kx>qz.wwI? }
Pi]19boM. }
xai*CY@cQ }
_f$^%?^ if(!bProcessed){
YB-h.1T- for(int index=0;index<MAX_KEY;index++){
;M)QwF1 if(hCallWnd[index]==NULL)
z6*X%6,8 continue;
N@t|7~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
FoN|i"*l SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
;lHr =e7 }
R}O_[ }
$<}$DH_Y }
HMSO=)@+ return CallNextHookEx( hHook, nCode, wParam, lParam );
Qk:Y2mL }
8fl`r~bqZ uScMn/% BOOL InitHotkey()
R%?9z 8- {
gt@m?w( if(hHook!=NULL){
-*1J f& nHookCount++;
<sBbT` return TRUE;
ML|FQ }
02c':a=7 else
RZXjgddL hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
\G*0"%!U if(hHook!=NULL)
Y$"O
VC nHookCount++;
%5(I/zB return (hHook!=NULL);
jYk&/@`Ly }
#d6)#:uss BOOL UnInit()
hb}+A=A=+ {
o]4*|ARPs if(nHookCount>1){
? m
DI# ~) nHookCount--;
E|iQc8gr& return TRUE;
F(>Np2oi6 }
1*\o. BOOL unhooked = UnhookWindowsHookEx(hHook);
h2G$@8t}I if(unhooked==TRUE){
Q+[n91ey** nHookCount=0;
:tV*7S=) hHook=NULL;
x(1:s|Uyp{ }
8Vr%n2M return unhooked;
AE[b},-[ }
nLXlU*ES y3@H/U{ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;r<^a6B {
F1*>y BOOL bAdded=FALSE;
h`^jyoF"( for(int index=0;index<MAX_KEY;index++){
dYJ(!V& if(hCallWnd[index]==0){
y
[}.yyye hCallWnd[index]=hWnd;
UtoT HotKey[index]=cKey;
os=e|vkB* HotKeyMask[index]=cMask;
u_oaebOrpP bAdded=TRUE;
k\5c|Wq|g KeyCount++;
~%<X0s| break;
9jM}~XvV }
H\ F:95 }
>*35C`^ return bAdded;
(A9Fhun }
0X6YdW _2X J')o|5S1N BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
geru=7 {
LBYMCY BOOL bRemoved=FALSE;
m*&]!mM"0G for(int index=0;index<MAX_KEY;index++){
o#3ly-ht if(hCallWnd[index]==hWnd){
; ZA~p if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
d,k!qjf=r hCallWnd[index]=NULL;
T(id^ w HotKey[index]=0;
E(>=rD /+ HotKeyMask[index]=0;
P3x8UR=fS bRemoved=TRUE;
NG+GEqx KeyCount--;
"L IF.) break;
9ijfRqI=x }
3lrT3a3vV }
11Q1AN }
0CnOL!3.I return bRemoved;
@0Ic3C[rH6 }
Ni9/}bb <? q?Mn void VerifyWindow()
YvaK0p0Z {
%~4M+r6T for(int i=0;i<MAX_KEY;i++){
-_=nDH if(hCallWnd
!=NULL){ ,LHn90S
if(!IsWindow(hCallWnd)){ .s?L^Z^
hCallWnd=NULL; #NEE7'&S
HotKey=0; ZgTW.<.%2
HotKeyMask=0; ]C!gQq2'a
KeyCount--; - YEZ]:"
} ha]VWt%}
} ]E5o1eeg
} xQ f*
} BtkOnbz8X
Ri<u/ ]oR"
BOOL CHookApp::InitInstance() )1?y 8_B
{ X-bcQ@Oj
AFX_MANAGE_STATE(AfxGetStaticModuleState()); r8`ffH
hins=AfxGetInstanceHandle(); |mZxfI
InitHotkey(); Ytn9B}%o
return CWinApp::InitInstance(); KI"#f$2&
} ER%^!xA
[_BP)e
int CHookApp::ExitInstance() d[iQ`YW5
{ bV^rsJm
VerifyWindow(); x]}^v#
UnInit(); S|Q@:r"
return CWinApp::ExitInstance(); uy>q7C
} lU8l}Ndz"
}7b%HTF=
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =x/X:;)>
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) D}-/c"':}
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ )3cAQ'w
#if _MSC_VER > 1000 j`{?OYD
#pragma once Y`~Ut:fZ
#endif // _MSC_VER > 1000 HY56"LZ$(}
zYH&i6nj
class CCaptureDlg : public CDialog sA+ }TNhq
{ /:cd\A}
// Construction g@d*\ P)
public: {i;r
BOOL bTray; M H|Og84
BOOL bRegistered; #|uCgdi
BOOL RegisterHotkey(); )HEa<P^kJl
UCHAR cKey; #]\Uk,mhZB
UCHAR cMask; ^
gdaa>L
void DeleteIcon(); )*u8/U
void AddIcon(); `}p0VmD{NE
UINT nCount; 7y.kQI?3
void SaveBmp(); /T"+KU*
CCaptureDlg(CWnd* pParent = NULL); // standard constructor pIc#L>{E
// Dialog Data KYB`D.O
//{{AFX_DATA(CCaptureDlg) s
n8Qk=K
enum { IDD = IDD_CAPTURE_DIALOG }; lov!o:dJ
CComboBox m_Key; (Lbbc+1m
BOOL m_bControl; %Tfbsyf%f
BOOL m_bAlt; ))qy;Q,
BOOL m_bShift; x`mG<Yt
CString m_Path; oh4E7yN
CString m_Number; vx{}}/B]J
//}}AFX_DATA })'B<vq
// ClassWizard generated virtual function overrides ,V7nzhA2
//{{AFX_VIRTUAL(CCaptureDlg) 0j^Kgx
public: B`EJb71^Xy
virtual BOOL PreTranslateMessage(MSG* pMsg); Lc}LGq!
protected: 9=s<Ld
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ko!)s
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); kXViWOXU^
//}}AFX_VIRTUAL EfqX
y>W
// Implementation [CY9^N
protected: v_yw@
HICON m_hIcon; t$` r4Lb9/
// Generated message map functions &j;wCvE4+
//{{AFX_MSG(CCaptureDlg) ___~D
dq
virtual BOOL OnInitDialog(); Mc) }\{J
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); aEB_#1
afx_msg void OnPaint(); <;lkUU(WT2
afx_msg HCURSOR OnQueryDragIcon(); b]e"1Y)D-
virtual void OnCancel(); &1Ok`_plO
afx_msg void OnAbout(); )j6~Wy@4
afx_msg void OnBrowse(); ]>!K3kB
afx_msg void OnChange(); }H53~@WP>
//}}AFX_MSG oe^ I
DECLARE_MESSAGE_MAP() 9p]QM)M
}; HVRZ[Y<^
#endif Usvl}{L[
d z|or9&
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file rm7ANMB:
#include "stdafx.h" [z:!j$K
#include "Capture.h" &0d#Y]D4`
#include "CaptureDlg.h" 9gW|}&-
#include <windowsx.h> e+EQ]<M
#pragma comment(lib,"hook.lib")
8$=n j
#ifdef _DEBUG ?d* z8w
#define new DEBUG_NEW @@f"%2ZR[
#undef THIS_FILE "MeVE#O
static char THIS_FILE[] = __FILE__; .e#w)K
#endif x[p|G5
#define IDM_SHELL WM_USER+1 KR}?H#%
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9+|$$)
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q3'llOx
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; }PlRx6r@
class CAboutDlg : public CDialog jRa43ck
{ ~g91Pr
public: #<fRE"v:Q
CAboutDlg(); ZtNN<7
// Dialog Data (g]!J_Z"
//{{AFX_DATA(CAboutDlg) 8\^R~K`sY
enum { IDD = IDD_ABOUTBOX }; Xg6Jh``
//}}AFX_DATA 9X6h
// ClassWizard generated virtual function overrides Ov@gh
kr
//{{AFX_VIRTUAL(CAboutDlg) }CSDV9).S
protected:
1~gnc|?
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l$KA)xbI
//}}AFX_VIRTUAL t9lPb_70
// Implementation FaAC&F@u
protected: MpT8" /.]A
//{{AFX_MSG(CAboutDlg) )$2QZ
qX
//}}AFX_MSG hgG9m[?K
DECLARE_MESSAGE_MAP() M-VX;/&FR
}; "nynl'Ryk
'@v\{ l
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) SO/c}vnBB
{ AYBns]!
//{{AFX_DATA_INIT(CAboutDlg) #^0R&) T
//}}AFX_DATA_INIT !)f\%lb
} .^`{1%
aqZi:icFa
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7sCG^&Y
{ [(i
CDialog::DoDataExchange(pDX); ~ah~cwmpS
//{{AFX_DATA_MAP(CAboutDlg) B`)BZ,#p
//}}AFX_DATA_MAP |d2SIyUc
} dFxIF;C>/
NWESP U):w
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) /8'NG6"H`
//{{AFX_MSG_MAP(CAboutDlg) K8|r&`X0
// No message handlers q>_.[+6
//}}AFX_MSG_MAP I9A~Ye
5O&
END_MESSAGE_MAP() P8:dU(nlW
$S6`}3
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) s[>,X#7 y
: CDialog(CCaptureDlg::IDD, pParent) 7~h<$8Y(T
{ C^Yb\N}S
//{{AFX_DATA_INIT(CCaptureDlg) -m zIT4
m_bControl = FALSE; +HpA:]#Y
m_bAlt = FALSE; QW~E&B%
m_bShift = FALSE; 2QcOR4_V
m_Path = _T("c:\\"); &J]K3w1p
m_Number = _T("0 picture captured."); bSlF=jT[S
nCount=0; "]*&oQCI
bRegistered=FALSE; 1s&zMWC
bTray=FALSE; z|J_b"u4
//}}AFX_DATA_INIT HVCe;eI
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 eb\K "ec"
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); tKuwpT1Qc
} "S]0
9<?M8_
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) oSKXt}sh
{ EWhK0Vej=
CDialog::DoDataExchange(pDX); 9rX&uP)j^#
//{{AFX_DATA_MAP(CCaptureDlg) $99n&t$Y
DDX_Control(pDX, IDC_KEY, m_Key); oCv.Ln1;Z
DDX_Check(pDX, IDC_CONTROL, m_bControl);
NR6#g,+7
DDX_Check(pDX, IDC_ALT, m_bAlt); Wis~$"
DDX_Check(pDX, IDC_SHIFT, m_bShift); 3pROf#M
DDX_Text(pDX, IDC_PATH, m_Path); n38p !oS
DDX_Text(pDX, IDC_NUMBER, m_Number); ub0.J#j@
//}}AFX_DATA_MAP Z clQ
} Y5Bo|*b
BwEN~2u6
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _.Nbt(mz
//{{AFX_MSG_MAP(CCaptureDlg) SHxNr(wJ<Q
ON_WM_SYSCOMMAND() wWP}C D
ON_WM_PAINT() &|1<v<I5
ON_WM_QUERYDRAGICON() gs[uD5oo<
ON_BN_CLICKED(ID_ABOUT, OnAbout) 2jItq2.>
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &t@jl\ND
ON_BN_CLICKED(ID_CHANGE, OnChange) S3 %FHS
//}}AFX_MSG_MAP -);Wfs
END_MESSAGE_MAP() \:'/'^=#|
{z5--TogJ
BOOL CCaptureDlg::OnInitDialog() r+i($jMs
{ I]t!xA~
CDialog::OnInitDialog(); {<p?2E
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); | j`@eF/"
ASSERT(IDM_ABOUTBOX < 0xF000); :r,pqnH_
CMenu* pSysMenu = GetSystemMenu(FALSE); -Cpl?Io`r5
if (pSysMenu != NULL) eK=xrk
{ YlQ=5u^+
CString strAboutMenu; d"mkL-
strAboutMenu.LoadString(IDS_ABOUTBOX); .G.0WR/2
if (!strAboutMenu.IsEmpty()) `AtBtjs RV
{ IMFDM."s
pSysMenu->AppendMenu(MF_SEPARATOR); t|\%VC
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); I*{nP)^9
} T*Exs|N2P-
} LmrfN?5
SetIcon(m_hIcon, TRUE); // Set big icon myQagqRx
SetIcon(m_hIcon, FALSE); // Set small icon ~H_/zK6e
m_Key.SetCurSel(0); nNV'O(x}
RegisterHotkey(); =:Fc;n>c<K
CMenu* pMenu=GetSystemMenu(FALSE); Fnv;^}\z
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); %N6A+5H
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ~
'cmSiz-
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); xh,qNnGGi
return TRUE; // return TRUE unless you set the focus to a control ^zmG0EH,
} <c-=3}=U\
`2WFk8) F
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) "Yv_B3p
{ .V/Rfq
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
.GXBc
{ #U4F0BdA
CAboutDlg dlgAbout; Gr'
CtO
dlgAbout.DoModal(); bHYy }weZ
} X/!o\yyT
else nwe*BVp
{ 85$m[+md
CDialog::OnSysCommand(nID, lParam); dr}`H,X"3
} 6r0krbN
} |bHelD|
TDKki(o=~
void CCaptureDlg::OnPaint() BLdvyVFx
{ ]i)c{y
if (IsIconic()) }O5i/#.lR
{ PI)+Jr%L
CPaintDC dc(this); // device context for painting (O?.)jEW(.
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); B\=8_z
// Center icon in client rectangle P>C~
i:4n
int cxIcon = GetSystemMetrics(SM_CXICON); .Iw AK/QS
int cyIcon = GetSystemMetrics(SM_CYICON); drP=A~?&:
CRect rect; X*XZb F"=
GetClientRect(&rect); KnQ*vM*VM
int x = (rect.Width() - cxIcon + 1) / 2; Jy:Qlx`
int y = (rect.Height() - cyIcon + 1) / 2; gQg"j)
// Draw the icon t;Sb/ 3
dc.DrawIcon(x, y, m_hIcon); 5"@*?X K^
} 0B/,/KX
else Su7?;Oh/yI
{ ;>yxNGV`
CDialog::OnPaint(); S(I{NL}=$
} ]EBxl=C}D
} .-c4wm}
=E4LRKn
HCURSOR CCaptureDlg::OnQueryDragIcon() 7
:x fPx
{ "Mn6U-
return (HCURSOR) m_hIcon; H>IMf/%5N-
} ay
;S4c/_
u@UMP@"#
void CCaptureDlg::OnCancel() =,=A,kI[;
{ VcO0sa f`
if(bTray) EStB#V^
DeleteIcon(); g`' !HGY
CDialog::OnCancel(); oXh#a8
} C.yQ=\U2
HGs $*
void CCaptureDlg::OnAbout() 2B[X,rL.pX
{ jyUjlYAAv`
CAboutDlg dlg; rk2j#>l$4
dlg.DoModal(); OJuG~euy
} wj^3N7_:w
RuA*YV
void CCaptureDlg::OnBrowse() y<|7z99L
{ O7m(o:t x3
CString str; mbTEp*H
BROWSEINFO bi; Lv;^My
char name[MAX_PATH]; %KhI>O<
ZeroMemory(&bi,sizeof(BROWSEINFO)); 36Zf^cFJ
bi.hwndOwner=GetSafeHwnd(); 9@(PWz=`?
bi.pszDisplayName=name; /sx&=[
D
bi.lpszTitle="Select folder"; JN-y)L/>
bi.ulFlags=BIF_RETURNONLYFSDIRS; EoR}Af
LPITEMIDLIST idl=SHBrowseForFolder(&bi); IqaT?+O\?r
if(idl==NULL) 3*"WG O5
return; {0wIR_dGX
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); t;}|tgC
str.ReleaseBuffer(); e "4 ''/
m_Path=str; \5:i;AE
if(str.GetAt(str.GetLength()-1)!='\\') 5h=}j
m_Path+="\\"; %~H-)_d20
UpdateData(FALSE); ?}tFN_X"
} *=/ { HvJ
Cazocq5
void CCaptureDlg::SaveBmp() @sW24J1q+
{ M#4pE_G
CDC dc; 30#s aGV
dc.CreateDC("DISPLAY",NULL,NULL,NULL); /tx]5`#@7]
CBitmap bm; TOB-aAO
int Width=GetSystemMetrics(SM_CXSCREEN); I(L,8n5
int Height=GetSystemMetrics(SM_CYSCREEN); J s@hLP`
bm.CreateCompatibleBitmap(&dc,Width,Height); pk$l+sNZ=
CDC tdc; SumF
2
tdc.CreateCompatibleDC(&dc); OUPUixz2Z
CBitmap*pOld=tdc.SelectObject(&bm); ~S"+S/z/k
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ifMRryN4
tdc.SelectObject(pOld); 2/\r)$
2i
BITMAP btm; ArI2wM/v
bm.GetBitmap(&btm); 8oy^Xc+
DWORD size=btm.bmWidthBytes*btm.bmHeight; BQE|8g'&T
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); l|JE#
BITMAPINFOHEADER bih; 'j8:vq^d
bih.biBitCount=btm.bmBitsPixel; u"cV%(#
bih.biClrImportant=0; *e TqVG.
bih.biClrUsed=0; jjRi*^d9
bih.biCompression=0; Ha0M)0Anv
bih.biHeight=btm.bmHeight; p J!
mw\:
bih.biPlanes=1; /!yU!`bY
bih.biSize=sizeof(BITMAPINFOHEADER); %op**@4/t\
bih.biSizeImage=size; Q^9_'t}X
bih.biWidth=btm.bmWidth; )Pa'UGY
bih.biXPelsPerMeter=0; ah4N|zJ>v
bih.biYPelsPerMeter=0; Ct <udO
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); H7&8\FNa
static int filecount=0; FF`T\&u
CString name; 9X+V4xux
name.Format("pict%04d.bmp",filecount++); wj$<t'MN
name=m_Path+name; ~rqCN,=d
BITMAPFILEHEADER bfh; ~tS Z%q
bfh.bfReserved1=bfh.bfReserved2=0; F3[T.sf
bfh.bfType=((WORD)('M'<< 8)|'B'); L2[($l
bfh.bfSize=54+size; hc(#{]].
bfh.bfOffBits=54; KEo,m
CFile bf; ky,(xT4
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <SAzxo:I
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *MFIV02[N
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7?!d^$B
bf.WriteHuge(lpData,size); ed{ -/l~j
bf.Close(); 93)sk/j
nCount++; zlSNfgO
} bivuqKA
GlobalFreePtr(lpData); .,|G7DGH]
if(nCount==1) 6RU~"C
m_Number.Format("%d picture captured.",nCount); #>("CAB02T
else ~|DUt
m_Number.Format("%d pictures captured.",nCount); UawyDs
UpdateData(FALSE); :gv{F} ##
} $u6"*|
Fh&G;aEq
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Wa>}wA=v
{ lwxaMjaL4K
if(pMsg -> message == WM_KEYDOWN) d`=MgHz
{ FJGlP&v<
if(pMsg -> wParam == VK_ESCAPE) `!3SF|x&
return TRUE; Zgp4`)}:
if(pMsg -> wParam == VK_RETURN) Tt`u:ZwhF
return TRUE; 6m/r+?'
} U/66L+1
return CDialog::PreTranslateMessage(pMsg); xf\ C|@i
} :(U,x<>
Fo (fWvz
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hlvK5Z
{ Jc&{`s^Nu
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ x$A+lj]x
SaveBmp(); xA2YG|RU=b
return FALSE; EqkN3%IG
} c)6m$5]
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ fZGX}T<)p-
CMenu pop; .ljnDL/
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); pGP7nw_g
CMenu*pMenu=pop.GetSubMenu(0); jh?H.;**
pMenu->SetDefaultItem(ID_EXITICON); Y#ap*
CPoint pt; :DK {Vg6
GetCursorPos(&pt); bI7Vwyz
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); z}77Eh<
if(id==ID_EXITICON) .FP$m?
DeleteIcon(); q<x/Hat)
else if(id==ID_EXIT) R^8o^z['6u
OnCancel(); +B,}Q r
return FALSE; G=s}12/Z"{
} Pf")e,u$
LRESULT res= CDialog::WindowProc(message, wParam, lParam); <6%?OJhp
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) e-})6)XgA
AddIcon(); GLH0 ]
return res; U#7#aeI
} PV.Xz0@R
UP$.+<vm
void CCaptureDlg::AddIcon() ANAVn@ [
{ jKz$@gP
NOTIFYICONDATA data; y>8sZuH0
data.cbSize=sizeof(NOTIFYICONDATA); nSDMOyj+
CString tip; p#ZCvPE;uH
tip.LoadString(IDS_ICONTIP); F$y$'Rzu_B
data.hIcon=GetIcon(0); )J o:pkM
data.hWnd=GetSafeHwnd(); W 8<&gh+
strcpy(data.szTip,tip); Co9^OF-k
data.uCallbackMessage=IDM_SHELL; ;>%r9pz ~
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; (R,#a *CV
data.uID=98; @o].He@L<j
Shell_NotifyIcon(NIM_ADD,&data); B-RjMxX4>
ShowWindow(SW_HIDE); ].avItg
bTray=TRUE; r8t}TU>C
} *P[hy
h]5(].
void CCaptureDlg::DeleteIcon() Q^P}\wb>
{ 9 &dtd
NOTIFYICONDATA data; S3C]AhW;
data.cbSize=sizeof(NOTIFYICONDATA); )rIwqUgp6\
data.hWnd=GetSafeHwnd(); j.[.1G*("
data.uID=98; zF`0J
Shell_NotifyIcon(NIM_DELETE,&data); &Q/ W~)~
ShowWindow(SW_SHOW); F>Ah0U0
SetForegroundWindow();
_O)>$.^6
ShowWindow(SW_SHOWNORMAL); etQCzYIhn
bTray=FALSE; udK%>
} w0 M>[ 4
EgEa1l!NSQ
void CCaptureDlg::OnChange() \{_q.;}
{ L?b~k=
RegisterHotkey(); "`/h#np
} Qab>|eSm
+uF>2b6'
BOOL CCaptureDlg::RegisterHotkey() -u+vJ6EY
{ Xz6<lLb
UpdateData(); YR\fa Vk
UCHAR mask=0; olB.*#gA
UCHAR key=0; zEX
if(m_bControl) L tO!umM
mask|=4; +yG~T
if(m_bAlt) tn\yI!a
mask|=2; -vo})lO
if(m_bShift) PudS2k_Qv
mask|=1; fCd&D
key=Key_Table[m_Key.GetCurSel()]; @Rze|
T.
if(bRegistered){ ;J( 8
L
DeleteHotkey(GetSafeHwnd(),cKey,cMask); V;VHv=9`o
bRegistered=FALSE; 3lL-)<0A(
} F} yW/
cMask=mask; ](]i 'fE>
cKey=key; [-1^-bb
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); BGZ#wru
return bRegistered; *->W^1eGM
} d A}-]
x
M/+L:_<
四、小结 Ys9[5@7
>{n,L6_t
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。