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:
!5?<% *
YT8F#t8 一、实现方法
c6/=Gq{. sUm' 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:
7T'B6`-Ox r!{Up7uL #pragma data_seg("shareddata")
FU<Jp3<% HHOOK hHook =NULL; //钩子句柄
7vj2
`+r. UINT nHookCount =0; //挂接的程序数目
dGTsc/$ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
:p6M= static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
O<W_fx8_' static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
-s'-eQF J static int KeyCount =0;
mlS$>O_aX static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
!$>R j #pragma data_seg()
Nl(Foya%) VOh4#%Vj 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。
@$K"o7+] F1Bq$*'N$w 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:
y L~W.H -1@<=jX3_ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
$
o#V# cKey,UCHAR cMask)
b\+`e b8_ {
fLAw12;^ BOOL bAdded=FALSE;
;P&OX5~V for(int index=0;index<MAX_KEY;index++){
E q+_&Wk if(hCallWnd[index]==0){
w"&n?L hCallWnd[index]=hWnd;
FN) $0 HotKey[index]=cKey;
$]2vvr HotKeyMask[index]=cMask;
!_Z&a bAdded=TRUE;
R_S.tT! KeyCount++;
?#Q #u|~ break;
lCHO;7YHX }
*siFj
CN< }
-+-_I*( return bAdded;
<yg F( }
&XUiKnNW //删除热键
tIS<U(N; BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
QnX(V[ {
*EwR!L* BOOL bRemoved=FALSE;
Hg (Gl for(int index=0;index<MAX_KEY;index++){
^D-/`d if(hCallWnd[index]==hWnd){
}f7j8py if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
|)/aGZ+ hCallWnd[index]=NULL;
z,%$+)K HotKey[index]=0;
@49S` HotKeyMask[index]=0;
KRKCD4 bRemoved=TRUE;
d9|<@A KeyCount--;
N_q|\S>t/ break;
%3''}Y5
}
P J[`| }
R0 }
K@w{"7} return bRemoved;
0NX,QD }
4tmAzD l0i^uMS "i W"NFO DLL中的钩子函数如下:
g5r(>, vY r^ ZEImjc LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
lBGQEP3; {
K8Y=S12Ti BOOL bProcessed=FALSE;
uOdl*| T? if(HC_ACTION==nCode)
c<$OA=n {
gjzuG<7m if((lParam&0xc0000000)==0xc0000000){// 有键松开
x;<W&s}( switch(wParam)
CYYU7 {
cq4Ipe case VK_MENU:
>Wg hn:^ MaskBits&=~ALTBIT;
(7=9++uU break;
%vi<Aseg case VK_CONTROL:
As<bL:>dE MaskBits&=~CTRLBIT;
'K,:j 388 break;
UU0,!?o4 case VK_SHIFT:
3=]sLn0L MaskBits&=~SHIFTBIT;
"@,}p\ break;
G+\GaY[ default: //judge the key and send message
0'?L#K break;
[Hh9a;.*}h }
B~Xw[q for(int index=0;index<MAX_KEY;index++){
%FI E\9 if(hCallWnd[index]==NULL)
_b;{_g continue;
y7Df_|Z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#|PS&}6wU {
Z!X0U7&U SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
~Vjl7G\7i bProcessed=TRUE;
q.`NtsW!\+ }
k7A-J\ }
x{/g(r={} }
5iydZ else if((lParam&0xc000ffff)==1){ //有键按下
WbqWG^W switch(wParam)
Czu\RXJR {
8StgsM case VK_MENU:
O#S.n#{ MaskBits|=ALTBIT;
P1' al break;
{fn!' case VK_CONTROL:
e(=w(;84 MaskBits|=CTRLBIT;
[Nbm|["q~ break;
6ar
case VK_SHIFT:
x39<6_?G MaskBits|=SHIFTBIT;
ZoZ|Ma break;
D]Xsvv
# default: //judge the key and send message
9\JF`ff_ break;
q;>7*Y& }
(+y for(int index=0;index<MAX_KEY;index++){
..'_o~Ka if(hCallWnd[index]==NULL)
9ahWIO% continue;
ly3\e_z:G if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
CooQ>f {
^iw'^6~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Jidwt$1l( bProcessed=TRUE;
F,)%?<!I }
j*TYoH1 }
2Gaa(rJ5o }
6]%sFy2 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
e|WJQd4+S for(int index=0;index<MAX_KEY;index++){
;&-k#PE]/H if(hCallWnd[index]==NULL)
;
_1
at continue;
7!TueP0Zd if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
VrQmP SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
&t:Gx<] //lParam的意义可看MSDN中WM_KEYDOWN部分
FNY8tv*/x }
b9<#K+L- }
$F+ L Ds }
|f_[\&<* return CallNextHookEx( hHook, nCode, wParam, lParam );
~d*(=G }
p/@smke 74k dsgQf 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
cI?8RF(; +jnJ|h({ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
JKmIvZ)8 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
!sW(wAy?o 2OR{[L*
为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
b:]V`uF? T\j{Bi5 \J LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
y^v6AM {
>DZw if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
k:F9. j%* {
kH7(@Pa //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
3e;^/kf<9 SaveBmp();
]B3=lc" return FALSE;
Vi]W |bP }
kbMWGB%; …… //其它处理及默认处理
OO*zhGD;[ }
-^h' >. fnX`Q[b4\A 6'G6<8>- 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
Jx](G>F4f1 yS(fILV 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
8sM|%<$=j RA'M8:$ 二、编程步骤
4UvZ)^r jiS_G%G 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";
%'7lbpy,f 8xV9.4S 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
;=;
9tX yt=3sq 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;
7gvnl~C( SVs_dG$ 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;
6NM:DI\% a>]uU*Xm 5、 添加代码,编译运行程序。
:xv!N*Le vK\%%H 三、程序代码
^l=!JP=M= }v!$dr,j' ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Vjp1RWb #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
W~~7C,! #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
;HJLs2bP #if _MSC_VER > 1000
W=Mb #pragma once
B!_mC<*4`X #endif // _MSC_VER > 1000
(#Gw1 #ifndef __AFXWIN_H__
?DQsc9y #error include 'stdafx.h' before including this file for PCH
2s&* #endif
rrqR}}l #include "resource.h" // main symbols
4Thn])%I class CHookApp : public CWinApp
Ix!Iw[CNd {
`YLD`(\ public:
D=m9fFz CHookApp();
[nc4{0 aT' // Overrides
>x+6{^}Q > // ClassWizard generated virtual function overrides
o` ZQ d,3 //{{AFX_VIRTUAL(CHookApp)
Avd
^ public:
UU mTOJr virtual BOOL InitInstance();
2w_W Adi virtual int ExitInstance();
8I8
F/47x //}}AFX_VIRTUAL
O%(fx!c` //{{AFX_MSG(CHookApp)
ICs\
z // NOTE - the ClassWizard will add and remove member functions here.
PQnF // DO NOT EDIT what you see in these blocks of generated code !
!^=*Jq> //}}AFX_MSG
,dov<U[ia DECLARE_MESSAGE_MAP()
(-xS?8x$ };
1[qLA!+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
QnXA*6DJ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
G!W[8UG BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
E^lvbLh' BOOL InitHotkey();
Wm"4Ae:B BOOL UnInit();
+ SFVv_n #endif
gp^5# d + / &?3 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
wNtx]t_M #include "stdafx.h"
9S7kUl{ #include "hook.h"
5rRN- #include <windowsx.h>
&7b|4a8B% #ifdef _DEBUG
TI#''XCB5 #define new DEBUG_NEW
?hM>mL #undef THIS_FILE
{7;8#.S72 static char THIS_FILE[] = __FILE__;
UXugRk%d #endif
V_RTI.3p #define MAX_KEY 100
E4W -hq~ #define CTRLBIT 0x04
2FF4W54I #define ALTBIT 0x02
8:>1F, #define SHIFTBIT 0x01
i;jw\ed #pragma data_seg("shareddata")
u7[ykyV HHOOK hHook =NULL;
QP)pgAc UINT nHookCount =0;
%Nhx;{ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
,TPISs static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
SAK!z!t static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
L %K\C static int KeyCount =0;
c^u"I'#Q static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
/X(t1 + #pragma data_seg()
#qI= Z0Y HINSTANCE hins;
{u\Mj void VerifyWindow();
"@d[h ,TM BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
wsN?[=l{s //{{AFX_MSG_MAP(CHookApp)
/VzI'^ // NOTE - the ClassWizard will add and remove mapping macros here.
t!x5 fNo) // DO NOT EDIT what you see in these blocks of generated code!
y[\VUzD*' //}}AFX_MSG_MAP
6morum END_MESSAGE_MAP()
2f:Eof(B
HA`@7I CHookApp::CHookApp()
`V"sOTb {
SWQ5fcPu // TODO: add construction code here,
2?,EzBeal // Place all significant initialization in InitInstance
"D'B3; uWK }
W#BM(I x~{;TZa[I CHookApp theApp;
/yF QeE LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
CkD#/
{
;SaX;!`39+ BOOL bProcessed=FALSE;
C;`XlQG ` if(HC_ACTION==nCode)
{R61cD,n {
?jt}*q>X] if((lParam&0xc0000000)==0xc0000000){// Key up
+
33@?fl. switch(wParam)
%Gj8F4{ {
'|*?*6q case VK_MENU:
;._7jFj. MaskBits&=~ALTBIT;
8&~~j7p, break;
no]z1D case VK_CONTROL:
wUQw!%?> MaskBits&=~CTRLBIT;
0iK;Egwm break;
TJ'[-- case VK_SHIFT:
+$(2:S*r MaskBits&=~SHIFTBIT;
K+8-9$w6 break;
I_%a{$Gjl default: //judge the key and send message
%4
XJn@J break;
EG0auzW? }
J9Ou+6 u( for(int index=0;index<MAX_KEY;index++){
9,_mS{+B if(hCallWnd[index]==NULL)
,FMx5$ continue;
ivz>dJ ?T if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
:ORR_f`> {
}gMDXy} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
4e;yG> bProcessed=TRUE;
wm")[!h)v }
WN5`;{\ }
I,VH=Yn5, }
3a 1 u else if((lParam&0xc000ffff)==1){ //Key down
Cc<,z*T switch(wParam)
d,tU#N{Q6 {
mBJeqG case VK_MENU:
HU-QDp%*r7 MaskBits|=ALTBIT;
{^rs#, W break;
k`9)=&zX+ case VK_CONTROL:
g'u?Rn7*J MaskBits|=CTRLBIT;
<[J[idY1he break;
-,aeM~ case VK_SHIFT:
V8wKAj
Ux MaskBits|=SHIFTBIT;
B Ma)O break;
7kK #\dI default: //judge the key and send message
>'xGp7}y break;
p=B>~CH }
u#A<hq; for(int index=0;index<MAX_KEY;index++)
hj$e|arB {
8kOKwEX if(hCallWnd[index]==NULL)
N0w`!<y:c continue;
c$`4*6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7,MS '2nz {
2gjGeM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
zrv#Xa!O\ bProcessed=TRUE;
L9ap( }
kR@Yl Yo }
7Irau_ }
o/
mF# if(!bProcessed){
m6yIR6H for(int index=0;index<MAX_KEY;index++){
8W+gl=C~ if(hCallWnd[index]==NULL)
p,<&zHb>K continue;
`)h6j)xiQ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
J~iBB~x. SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
p!V>XY'N^ }
Z,;cCxE }
ror|R@;y }
P;8>5;U4- return CallNextHookEx( hHook, nCode, wParam, lParam );
Enq|Y$qm }
T<joRR J5[~LZKW BOOL InitHotkey()
r-IVb&uFb {
deeU@x`f< if(hHook!=NULL){
q$.{j"cZV nHookCount++;
dg7=X{=9jv return TRUE;
8; R| }
V~yAE@9 else
XJ+6FT/qss hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
%77p5ctW if(hHook!=NULL)
@[?!s%*2 nHookCount++;
oi&Wo'DX return (hHook!=NULL);
&Q=ZwC7# }
omf Rs BOOL UnInit()
vNOH&ja-s {
b*mKei if(nHookCount>1){
>x@P|\ nHookCount--;
lE
;jCN return TRUE;
XC3Kh^ }
'[(nmx'yVJ BOOL unhooked = UnhookWindowsHookEx(hHook);
's!-80sd if(unhooked==TRUE){
ExXM:1 e26 nHookCount=0;
_uu<4c hHook=NULL;
cj|*_} }
u%d K ig return unhooked;
$7Mtt.d6 }
>71&]/Rv &&<9p;E BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
O^I[
(8Y8 {
}2r+%V&4 BOOL bAdded=FALSE;
5q<zN for(int index=0;index<MAX_KEY;index++){
^Ori|
4}' if(hCallWnd[index]==0){
l
n}}5Q hCallWnd[index]=hWnd;
"%QD{z_L HotKey[index]=cKey;
Y?r
po HotKeyMask[index]=cMask;
v)kEyX'K2d bAdded=TRUE;
>7U>Yh KeyCount++;
j#6|V]l break;
iG,t_?? }
-
?!:{UXl }
$O:w(U return bAdded;
68'>Zbelb }
7C?.L70ZY 3%<C<( BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
w*w?S {
E}Xka1 Bn BOOL bRemoved=FALSE;
N(3R|Ii for(int index=0;index<MAX_KEY;index++){
r\9TMg`C if(hCallWnd[index]==hWnd){
ftavbNR`W if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
n1:v HBM@\ hCallWnd[index]=NULL;
-,":5V26 HotKey[index]=0;
*NSlo^R-[ HotKeyMask[index]=0;
pY^9l3y^ bRemoved=TRUE;
l t]B#, ' KeyCount--;
F X1ZG! break;
f|a DTWF }
VzRx%j/i }
j%*7feSNC }
=OV2 uq return bRemoved;
M_D6i%b^ }
lZt(&^T 3|@t%K void VerifyWindow()
{- 63/z {
;+I4&VieK for(int i=0;i<MAX_KEY;i++){
TQ1WVq
}* if(hCallWnd
!=NULL){ Lg`Jp&Kg
if(!IsWindow(hCallWnd)){ ,
Ut Hc]
hCallWnd=NULL; [ij,RE7,T
HotKey=0; g"!\\:M
HotKeyMask=0; -lRhz!E]
KeyCount--; L$Z(+6m5
} qMS}t3X
} _b4fS'[
} ;
a/cty0Ch
} jlKGXD)Q[
U06o;s(
BOOL CHookApp::InitInstance() EH+~].PJd
{ .1*DR]^`
AFX_MANAGE_STATE(AfxGetStaticModuleState()); #DP7SO
hins=AfxGetInstanceHandle(); R/<=mZ
InitHotkey(); $)e:8jS=
return CWinApp::InitInstance();
td(M#a-
} VKLU0*2R
~j,TVY
int CHookApp::ExitInstance() C'9 1d7E
{ +3bfD
VerifyWindow(); ? Ekq6uz\)
UnInit(); H^CilwD158
return CWinApp::ExitInstance(); {B yn{?w
} 0B0G2t&hr
?SUQk55w
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file T2Z[AvNXFk
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <e6=% 9
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,bSVVT-b
#if _MSC_VER > 1000 O5 7jz= r
#pragma once K a r~I
#endif // _MSC_VER > 1000 j=.g:&r)
iWXMKu
class CCaptureDlg : public CDialog !J.rM5K
{ d0C8*ifFO
// Construction
'=TTa
public: 9Nl*4
BOOL bTray; U
%:c],Fk
BOOL bRegistered; S[@6Lp3q_
BOOL RegisterHotkey(); 12r` )
UCHAR cKey; 4NVgOr:
UCHAR cMask; &?$\Y,{
void DeleteIcon(); Cals?u#U=
void AddIcon(); B {i&~k
UINT nCount; *=^[VV!
void SaveBmp(); =O^7TrM
CCaptureDlg(CWnd* pParent = NULL); // standard constructor FH n,]Tfx
// Dialog Data ^L~ [+|
//{{AFX_DATA(CCaptureDlg)
o?R,0 -
enum { IDD = IDD_CAPTURE_DIALOG }; Ry%YM,K3
CComboBox m_Key;
l/ V&s<
BOOL m_bControl; gv` h-b
BOOL m_bAlt; |z7dRDU}]
BOOL m_bShift; 1XnBK$`
CString m_Path; nJ# XVlHc
CString m_Number; s}b*5@8|tA
//}}AFX_DATA 4 ROWz
// ClassWizard generated virtual function overrides (/q}mB
//{{AFX_VIRTUAL(CCaptureDlg) t+}uIp42<
public: aVK()1v]
virtual BOOL PreTranslateMessage(MSG* pMsg); [>uwk``_
protected: iy
3DX|]
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "X?LAo
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !\w\ ]7ls
//}}AFX_VIRTUAL @dhH;gt.I
// Implementation H5q:z=A
protected: Nzc>)2% N
HICON m_hIcon; 59qnEIi
// Generated message map functions GHrBK&
//{{AFX_MSG(CCaptureDlg) |2UauTp5yK
virtual BOOL OnInitDialog(); HU3Vv<lz
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); j[T%'%
afx_msg void OnPaint(); er\:U0fr#@
afx_msg HCURSOR OnQueryDragIcon(); =w ,(M
virtual void OnCancel(); (j`l5r#X#/
afx_msg void OnAbout(); ArdJ."
afx_msg void OnBrowse(); 8c?8X=|D7
afx_msg void OnChange(); H5^Y->
//}}AFX_MSG &
3I7]Wm
DECLARE_MESSAGE_MAP() sRil>6QR
}; i0&)
N,5_
#endif %~(~W>^A
Y=WR6!{
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file }moz9a
#include "stdafx.h" &@oq~j_7
#include "Capture.h" tYI]=:
#include "CaptureDlg.h" G\IocZ3Gz
#include <windowsx.h> B(EtXB9
#pragma comment(lib,"hook.lib") v7$9QVze
#ifdef _DEBUG B#H2RTc
#define new DEBUG_NEW $:HLRl{2E
#undef THIS_FILE W.GN0(uG
static char THIS_FILE[] = __FILE__; =tP$re";o
#endif I1J)#p%H.
#define IDM_SHELL WM_USER+1 .i\wE@v
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;W4:#/~14
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a:xgjUt&5
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; {N@Y<=+:
class CAboutDlg : public CDialog JbVi1?c
{ 6A@Lj*:2m
public: VG#$fRrZ
CAboutDlg(); :EaiM J_=
// Dialog Data {C, #rj
//{{AFX_DATA(CAboutDlg) ^8U6"O6|X
enum { IDD = IDD_ABOUTBOX }; ma`w\8a
//}}AFX_DATA )da:&F -
// ClassWizard generated virtual function overrides t)`+d=P
//{{AFX_VIRTUAL(CAboutDlg) =z']s4
protected: i!ds {`d
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t-a`.y
//}}AFX_VIRTUAL %`N&ti
// Implementation j?d!}v
protected: c8!j6\dC*
//{{AFX_MSG(CAboutDlg) )m> 6hk
//}}AFX_MSG Wpa$B
)xg
DECLARE_MESSAGE_MAP() EsNk<Ra
}; PH{c,
4jPwL|#
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 3Y=,r!F.h
{ (#lm#?<)
//{{AFX_DATA_INIT(CAboutDlg) fLc!Sn.Y
//}}AFX_DATA_INIT V4qZc0<,H
} !4!S{#<q
6#/LyzZq|
void CAboutDlg::DoDataExchange(CDataExchange* pDX) s:G[Em1
{ gx&\Kw6HM
CDialog::DoDataExchange(pDX); N_*u5mfQX
//{{AFX_DATA_MAP(CAboutDlg) TosPk(o(
//}}AFX_DATA_MAP tgS+"ugl
} 7n$AkzO0
sd]0Hx[
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {m>~`
//{{AFX_MSG_MAP(CAboutDlg) sL;z"N@PK
// No message handlers SIJ# ?0,
//}}AFX_MSG_MAP V&$ J;
END_MESSAGE_MAP() t
PAt?
Fj36K6!#?
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 'XG:1Bpm
: CDialog(CCaptureDlg::IDD, pParent) h7)VJY
{ x*k65WO\
//{{AFX_DATA_INIT(CCaptureDlg) Pi^ECSzQu[
m_bControl = FALSE; 8dYk3sk
m_bAlt = FALSE; FL5ibg
m_bShift = FALSE; D;K&
m_Path = _T("c:\\"); Bl:{p>-q
m_Number = _T("0 picture captured."); Nt?2USTs-
nCount=0; c4S>_qH
bRegistered=FALSE; R'jUS7]Y
bTray=FALSE; o$^O<z L
//}}AFX_DATA_INIT )jp{*?^\
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 p,!fIx
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); V_7Y1GD
} zLE>kK
AD0ptHUBa
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 1
yxZ
{ X=-gAutfE=
CDialog::DoDataExchange(pDX); ze-TBh/
//{{AFX_DATA_MAP(CCaptureDlg) JsHxQ0Tw
DDX_Control(pDX, IDC_KEY, m_Key); %D`^
DDX_Check(pDX, IDC_CONTROL, m_bControl); _m)gO/02A
DDX_Check(pDX, IDC_ALT, m_bAlt); h0&>GY;i
DDX_Check(pDX, IDC_SHIFT, m_bShift); I%.jc2kK
DDX_Text(pDX, IDC_PATH, m_Path);
&
bp#1KR)
DDX_Text(pDX, IDC_NUMBER, m_Number); ~m009
//}}AFX_DATA_MAP f]{1ZU%4
} /7!_un9
>;T$#LZ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .eZPp~[lAN
//{{AFX_MSG_MAP(CCaptureDlg) d"QM;9
ON_WM_SYSCOMMAND() 2D\x-!l/
ON_WM_PAINT() 'Y~8_+J?
ON_WM_QUERYDRAGICON() a
5~G
ON_BN_CLICKED(ID_ABOUT, OnAbout) /gMa" 5?,
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) OtrXYiKB
ON_BN_CLICKED(ID_CHANGE, OnChange) @+QYWh'
//}}AFX_MSG_MAP {PP ^Rb)
END_MESSAGE_MAP() FkB6*dm-
G
"c&C
BOOL CCaptureDlg::OnInitDialog() VPq5xSc?
{ {66Q" H"I
CDialog::OnInitDialog(); @1`W<WP
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); G!>
iqG
ASSERT(IDM_ABOUTBOX < 0xF000); `[g#Mxw
CMenu* pSysMenu = GetSystemMenu(FALSE); N{0+C?{_
if (pSysMenu != NULL) )VV4HoH]8
{ :G6 xJlE|
CString strAboutMenu; ~_/<PIm
strAboutMenu.LoadString(IDS_ABOUTBOX); \Nh^Ig
if (!strAboutMenu.IsEmpty()) D]LFX/hlH
{ o|Yn(xu-
pSysMenu->AppendMenu(MF_SEPARATOR); fF9;lWt
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); pGZl.OI
} |e.3FjTH
} T7WZ(y
3C
SetIcon(m_hIcon, TRUE); // Set big icon )- Wn'C'Z
SetIcon(m_hIcon, FALSE); // Set small icon !=k*hl0h
m_Key.SetCurSel(0); k *zc5ev}
RegisterHotkey(); Q8M:7#ySji
CMenu* pMenu=GetSystemMenu(FALSE); UeK,q>i
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 5Tcl<Y6l
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [TpA26#TTO
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); tDuUAI54
return TRUE; // return TRUE unless you set the focus to a control CBz(hCaI
} etQx>U
)f:!#v(K
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X=*Yzz}
{ x3p;H02i\
if ((nID & 0xFFF0) == IDM_ABOUTBOX) =F!",a~
{ :"y7Weh
CAboutDlg dlgAbout;
?fqkM
dlgAbout.DoModal(); *1 J#Mdd
} inq4CGY
else 4P-'(4I)
{ m,"cbJ
/
CDialog::OnSysCommand(nID, lParam); nf+"vr}1
} +Y>cBSO
} NXV~[
zd*W5~xKg
void CCaptureDlg::OnPaint() ><:lUt*N2
{ jmA{rD W
if (IsIconic()) Cs6zv>SR
{ dmTW]P2
CPaintDC dc(this); // device context for painting Jte:l:yjtA
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); jmZ|b6
// Center icon in client rectangle `*2*xDuP
int cxIcon = GetSystemMetrics(SM_CXICON); sWpRX2{5,
int cyIcon = GetSystemMetrics(SM_CYICON); nw]e_sm
CRect rect; ,&pF:qlF
GetClientRect(&rect); 04T*\G^:=
int x = (rect.Width() - cxIcon + 1) / 2; C6;](rN)N
int y = (rect.Height() - cyIcon + 1) / 2; LYxlo<f
// Draw the icon h#6 jUQ
dc.DrawIcon(x, y, m_hIcon); NIXc ib"tG
} n<Xm%KH.
else GQ8Dj!8
{ Xj@
CDialog::OnPaint(); \Im\*A
} ?'8MI|*l%
} Ry*I~<m
uN?O*h/(
HCURSOR CCaptureDlg::OnQueryDragIcon() :Jsz"vCg&s
{ VQW)qOR9
return (HCURSOR) m_hIcon; l2KxZteXY0
} si"mM>e
4'4s EjyA
void CCaptureDlg::OnCancel() b6E8ase:F
{ d8y=.
if(bTray) 3<.j`JB@&
DeleteIcon(); i+
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CDialog::OnCancel(); RWm Q]
} @gVyLefS6g
7`'fUhB!
void CCaptureDlg::OnAbout() ]mLTF',5
{ ePcI^}{
CAboutDlg dlg; 6w`}+3
dlg.DoModal(); eMPQ|
W
} FoelOq6
\]e w@C
void CCaptureDlg::OnBrowse() /j5-
"<;.
{ V2sB[Mw
CString str; \kJt@ [w%
BROWSEINFO bi; ,+5VeRyrV
char name[MAX_PATH]; p(b1I+!
ZeroMemory(&bi,sizeof(BROWSEINFO)); =g>7|?6>=
bi.hwndOwner=GetSafeHwnd(); D 5wR?O
bi.pszDisplayName=name; JV6U0$g_S
bi.lpszTitle="Select folder"; r
:MaAT<
bi.ulFlags=BIF_RETURNONLYFSDIRS; zZjLt1
LPITEMIDLIST idl=SHBrowseForFolder(&bi); u g$\&rM>
if(idl==NULL) Z=5}17kA
return; YPJx/@Z`
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); uP'w.nA&2
str.ReleaseBuffer(); -~GJ; Uw
m_Path=str; %K f. F
if(str.GetAt(str.GetLength()-1)!='\\') Hn'2'Vu
m_Path+="\\"; t-gNG!B
UpdateData(FALSE); Hn]n]wsLy
} &DhA$o "'
$(mdz)Cfy
void CCaptureDlg::SaveBmp() ~esEql=Q3'
{ +AC-f2
CDC dc;
'jl XLb
dc.CreateDC("DISPLAY",NULL,NULL,NULL); a>jI_)L
CBitmap bm; Ch&]<#E>`
int Width=GetSystemMetrics(SM_CXSCREEN); XTXo xZ#w
int Height=GetSystemMetrics(SM_CYSCREEN); 3ijI2Zy
bm.CreateCompatibleBitmap(&dc,Width,Height); NCpn^m)Q}
CDC tdc; 4a50w:Jy]
tdc.CreateCompatibleDC(&dc); YH+\rb_
CBitmap*pOld=tdc.SelectObject(&bm); gm\o>YclS
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X\)KVn`
tdc.SelectObject(pOld); dcTM02kEh
BITMAP btm; Am`A[rV0
bm.GetBitmap(&btm); >]08".ajS
DWORD size=btm.bmWidthBytes*btm.bmHeight; r^tXr[}
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =
(h;L$
BITMAPINFOHEADER bih; VKJ~ZIO@A
bih.biBitCount=btm.bmBitsPixel; F^bQ-
bih.biClrImportant=0; xgw)`>p,W
bih.biClrUsed=0; Bst>9V&R
bih.biCompression=0; 7a_n\]t465
bih.biHeight=btm.bmHeight;
qy(/
bih.biPlanes=1; >xMhA`l
bih.biSize=sizeof(BITMAPINFOHEADER); 8q[WfD
bih.biSizeImage=size; >(4S `}K
bih.biWidth=btm.bmWidth; r@ *A
bih.biXPelsPerMeter=0; 92ww[+RQ@
bih.biYPelsPerMeter=0; 1?$!y
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 7tO$'q*h
static int filecount=0; nVA'O
CString name; |}y}o:(
name.Format("pict%04d.bmp",filecount++); Nc Mq>n
name=m_Path+name; ,
p=8tf#
BITMAPFILEHEADER bfh; IMw)X0z
bfh.bfReserved1=bfh.bfReserved2=0; %1+~(1P
bfh.bfType=((WORD)('M'<< 8)|'B'); q@Yt`$VTN
bfh.bfSize=54+size; tZ24}~da
bfh.bfOffBits=54; KK3xz*W0
CFile bf; T@.m^|~
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ t>u9NZt G
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ~vZzKRVS
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u,9U0ua@;
bf.WriteHuge(lpData,size); v7u}nx
bf.Close(); hg/&[/eodm
nCount++; e>9{36~jh
} !td.ks0
GlobalFreePtr(lpData); -#M~NbI,
if(nCount==1) "/h"Xg>q
m_Number.Format("%d picture captured.",nCount); NJ!#0[@C
else Dk6\p~q
m_Number.Format("%d pictures captured.",nCount); /1
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UpdateData(FALSE); -2Cf)>`v
} w/Dm
zk~ rKQ,
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 2l4 i-;
{ t|"d#5'
if(pMsg -> message == WM_KEYDOWN) `l#$l3v+
{ !0+Ex
F
if(pMsg -> wParam == VK_ESCAPE) ,/U9v~
return TRUE; ri V/wN9C
if(pMsg -> wParam == VK_RETURN) {!bJ.O
l
return TRUE; ~7lvY+k)<
} <?}g[]i
return CDialog::PreTranslateMessage(pMsg); 0|vWwZq
}
3YF]o9
~?+m=\
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =9MH
{ m;1e xa
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ o*BI^4
SaveBmp(); 5i&V ~G
return FALSE; rmoEc]kt]
} ^Exq=oV
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ e(N <Mf
CMenu pop; u`nn{C4D"
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); jM<Ihmh|
CMenu*pMenu=pop.GetSubMenu(0); 7B :aJfxM
pMenu->SetDefaultItem(ID_EXITICON); L%Hm#eFx
CPoint pt; <xNM@!'\h
GetCursorPos(&pt); ," R_ve
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 'F~SNIay
if(id==ID_EXITICON) ;$;/#8`>
DeleteIcon(); p5BcDYOw`
else if(id==ID_EXIT) R7b*(33
OnCancel(); f|E'eFrFk
return FALSE; 0~+:~$VrT
} /T'nY{
LRESULT res= CDialog::WindowProc(message, wParam, lParam); bG?[":k
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) t!C-G+It
AddIcon(); F+r6/e6a
return res; [=!MS?-G
} Ik)Q0_<a
"&|2IA
void CCaptureDlg::AddIcon() ] 6B!eB
!
{ |{"7/~*[
NOTIFYICONDATA data; !A0bbJ
data.cbSize=sizeof(NOTIFYICONDATA); rnaDo\5
CString tip; h:90K
tip.LoadString(IDS_ICONTIP); T ua
@w+
data.hIcon=GetIcon(0); DZZt%n8J
data.hWnd=GetSafeHwnd(); 4 l(o{{
strcpy(data.szTip,tip); *r3vTgo$
data.uCallbackMessage=IDM_SHELL; y~ LVK8
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; y>PbYjuIU
data.uID=98; go5!zSs
Shell_NotifyIcon(NIM_ADD,&data); Jz b".A
ShowWindow(SW_HIDE); >f/g:[
bTray=TRUE; ,"ZlY}!Gn
} w!M ^p&T7
g/gLG:C
void CCaptureDlg::DeleteIcon() gH.^NO5\'
{ rP_)*)
NOTIFYICONDATA data; |XZf:}q5:
data.cbSize=sizeof(NOTIFYICONDATA); u9(AT>HxT
data.hWnd=GetSafeHwnd(); C(hg"_W ou
data.uID=98; ;& +75n
Shell_NotifyIcon(NIM_DELETE,&data); ?^p8]Va%
ShowWindow(SW_SHOW); D._r@~o
SetForegroundWindow(); T]`"
Xl8
ShowWindow(SW_SHOWNORMAL); SO"P3X
bTray=FALSE; 58,mu#yq6
} `6su_8Hno
sJ=B:3jS0
void CCaptureDlg::OnChange() IgJC>;]u
{ %4J?xhd
RegisterHotkey(); !y.7"G*
} 3\ed4D
&|eQLY
#l
BOOL CCaptureDlg::RegisterHotkey() 3.Kdz}
{ }X-ggO,
UpdateData(); qMOD TM~+
UCHAR mask=0; `!N?#N:b)
UCHAR key=0; ;GSj}Nq
if(m_bControl) eNb =`
mask|=4; -`&;3
7
if(m_bAlt) 4G ?k31,k
mask|=2; dZZ/(oE>
if(m_bShift) O*7
pg
mask|=1; f0+
key=Key_Table[m_Key.GetCurSel()]; DK;-2K
if(bRegistered){ g.Q ?Z{
DeleteHotkey(GetSafeHwnd(),cKey,cMask); |1R@Jz`
bRegistered=FALSE; >{Q2S
} 3&f{lsLAC
cMask=mask; 8pk">"#s
cKey=key; XlPy(>
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \&0NH=*^
return bRegistered; >{Djx
} >E3OYa?G
M*%Z5,Tc
四、小结 *d 4D9(
mDUS9>
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。