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:
yU? jmJ
VFHd2Ea( 一、实现方法
$o^Z$VmL JzHG5nmB 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:
8-#kY}d. 1(p:dqGS #pragma data_seg("shareddata")
Vh~hfj" HHOOK hHook =NULL; //钩子句柄
Snk+ZQ- UINT nHookCount =0; //挂接的程序数目
$w(RJ/ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
?R]`M_^&u! static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
9a*#r;R static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
^kfqw0! static int KeyCount =0;
5W)ST&YPL* static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Kk^*#vR #pragma data_seg()
5G355 ,}E biHacm
关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
G*IP?c>= prZ
,4\ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
g}MUfl-L "Not /8J BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
nI6gd%C cKey,UCHAR cMask)
+q&Hj|;8r {
SnE^\I^O BOOL bAdded=FALSE;
?^voA.Bv< for(int index=0;index<MAX_KEY;index++){
d,GOP_N8I if(hCallWnd[index]==0){
"3^tVX%$\[ hCallWnd[index]=hWnd;
9FDu{4: HotKey[index]=cKey;
vRe{B7}p; HotKeyMask[index]=cMask;
F! =l
r bAdded=TRUE;
+W4}&S KeyCount++;
OZ\6qMH3e break;
#Hrzk!&9 }
Mj;V.Y }
H,} &=SCk return bAdded;
W6<oy }
F! !HwI //删除热键
>!Yuef
<P BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
t5{P'v9J {
&_L%wV|[ BOOL bRemoved=FALSE;
l~E~! MR for(int index=0;index<MAX_KEY;index++){
Ef] Hpjvp if(hCallWnd[index]==hWnd){
3en9TB if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
mG
S4W; hCallWnd[index]=NULL;
2 GRI<M HotKey[index]=0;
g-qXS]y7 HotKeyMask[index]=0;
>NUbk9}J4 bRemoved=TRUE;
u%C oo KeyCount--;
n#+EG3 break;
c|/HX%Y
}
<UGaIb
}
N|DfE{, }
BpIyw
return bRemoved;
4]r_K2.cc }
H9)@q3<
PCl5,]B} ~xd?y*gk; DLL中的钩子函数如下:
}xsO^K vIpL8B86a LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
VKttJok1 {
m?(8T|i BOOL bProcessed=FALSE;
[rx9gOOa& if(HC_ACTION==nCode)
IQJ"B6U) {
[NSslVr if((lParam&0xc0000000)==0xc0000000){// 有键松开
.?{no}u. switch(wParam)
f30J8n"k {
~A>fB2.pM case VK_MENU:
yz68g?" MaskBits&=~ALTBIT;
j4IVIj@$` break;
=e6pv# case VK_CONTROL:
-$8ew+ MaskBits&=~CTRLBIT;
vh\i ^ break;
Ic(qA{SM case VK_SHIFT:
`O6#-<> MaskBits&=~SHIFTBIT;
F;Q,cg M break;
s!(R default: //judge the key and send message
L3{(Bu break;
2Wzx1_D"a }
HTh?&u\QG for(int index=0;index<MAX_KEY;index++){
>W> rhxU if(hCallWnd[index]==NULL)
}r,M(Zr continue;
uZ?P{E,K if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
vx9!KWy} {
9d"*Z%!j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
JX0M3|I= bProcessed=TRUE;
ox&5}&\ }
3%*igpj\) }
z 3aGK }
5Od%Jhtt else if((lParam&0xc000ffff)==1){ //有键按下
PIH\*2\/ switch(wParam)
1h@qcom9K_ {
@JGmOwZ case VK_MENU:
+JErc)% MaskBits|=ALTBIT;
=7V4{|ESfy break;
SrKitSG case VK_CONTROL:
uq3pk3
)W9 MaskBits|=CTRLBIT;
#}#m\=0 break;
ndD>Oc}"3 case VK_SHIFT:
|jIH gm MaskBits|=SHIFTBIT;
u
8o! break;
JwMRquQv default: //judge the key and send message
@V:K]M 5 break;
Wx0i_HFR }
]0D- g2!|A for(int index=0;index<MAX_KEY;index++){
VgbNZ{qk@ if(hCallWnd[index]==NULL)
^t'mW;C$4 continue;
eJoM4v if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
p-$C*0{ {
z)T-<zWO; SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
qy|bOl bProcessed=TRUE;
{\5(aQ)Vi5 }
[ K? }
;^/ruf[t }
Rs=Fcvl if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
_&l8^MD for(int index=0;index<MAX_KEY;index++){
2 `AdNt, if(hCallWnd[index]==NULL)
+,spC`M6h continue;
N1'"7eg/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
^ = C> SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
O: :FB.k //lParam的意义可看MSDN中WM_KEYDOWN部分
J#`7! }
6SCjlaGW5 }
|*?N#0s5h }
W5u5!L/ return CallNextHookEx( hHook, nCode, wParam, lParam );
nWsRauY }
jgE{JK\n4 [R4#bl 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:
yepRJ%mp I7vP*YE 7F BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
_4>DuklH, BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
k^oSG1F 8sj2@d 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:
a[hF2/* ,t 2CQ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
uUfw"*D {
Ij(dgY if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
)>ML7y {
&m--} //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
l-w4E"n3 SaveBmp();
3}}/,pGSc return FALSE;
eY3:Nl^ }
|va@&;#wf …… //其它处理及默认处理
)#AYb }
jN+`V)p :kHk'.V1( lH3.q4D
5 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。
-=lm`X<: /6rjGc 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。
XI`_PQco Kvg=7o 二、编程步骤
\];|$FQg
Z kw-a 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
c&T5C,] DAq
H 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
ai;!Q%B#Q l]|&j`'O 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
D&m1yl@\J dFg&|Lp 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
{b- C,J b!g)/%C
5、 添加代码,编译运行程序。
9-n]_AF`0 t'F$/mx. 三、程序代码
>IQ&*Bb +_:p8,
5o ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
|!K&h(J| #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
|6NvByc, #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
xd3mAf #if _MSC_VER > 1000
cPIyD?c #pragma once
!$HuH6_[ #endif // _MSC_VER > 1000
05ZYOs } #ifndef __AFXWIN_H__
u0R[TA3 #error include 'stdafx.h' before including this file for PCH
87[o^) 8 #endif
3R/6/+S- #include "resource.h" // main symbols
~^.,Ftkb@7 class CHookApp : public CWinApp
{Q/@ Y.~< {
08:K9zr public:
yHM29fEZk CHookApp();
^Whc<>| // Overrides
jEKa9rt // ClassWizard generated virtual function overrides
0(&uH0x //{{AFX_VIRTUAL(CHookApp)
9I 6^-m@: public:
"^t7]=q virtual BOOL InitInstance();
4oF,;o+v\4 virtual int ExitInstance();
2^s@n3t //}}AFX_VIRTUAL
qb nlD\ //{{AFX_MSG(CHookApp)
S?t
`/"O // NOTE - the ClassWizard will add and remove member functions here.
vasw@Uto) // DO NOT EDIT what you see in these blocks of generated code !
toF6 Z //}}AFX_MSG
kk126?V]_ DECLARE_MESSAGE_MAP()
w32F?78] };
W9cvxsox LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Nj6Np^@sH BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
p,WBF BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
L,_U co BOOL InitHotkey();
-C^qN7Bz BOOL UnInit();
gu3)HCZ #endif
>`30 ib NO*~C',cI/ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
^ &KH|qRrO #include "stdafx.h"
y3*IF2G #include "hook.h"
fo}@B&=4 #include <windowsx.h>
JBQ>"X^ #ifdef _DEBUG
5YZ\@<|rH #define new DEBUG_NEW
ed,+Slg #undef THIS_FILE
,,XHw;{ static char THIS_FILE[] = __FILE__;
w;VUP@Wm #endif
Y\!:/h]E& #define MAX_KEY 100
"~C\Z} ; #define CTRLBIT 0x04
|RpZr!3V #define ALTBIT 0x02
^umHuAAE #define SHIFTBIT 0x01
Ahd{f! #pragma data_seg("shareddata")
M]\"]H? HHOOK hHook =NULL;
oQyMs> g UINT nHookCount =0;
&m(eMX0lU static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
5NSXSR9c static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
jbOzbxR? static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
^<yM0'0t static int KeyCount =0;
XSZjuQ<[3 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
:\#]uDT2= #pragma data_seg()
VyU!r*
o HINSTANCE hins;
r'}#usB( void VerifyWindow();
jaThS!>v BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
t[%=[pJHW //{{AFX_MSG_MAP(CHookApp)
fZd~},X // NOTE - the ClassWizard will add and remove mapping macros here.
:+DAzjwO< // DO NOT EDIT what you see in these blocks of generated code!
:?%_JM5U //}}AFX_MSG_MAP
>fR#U"KPAB END_MESSAGE_MAP()
b=Sl`&A ]:^kw$ CHookApp::CHookApp()
d@|j>Z {
'9wD+'c=A // TODO: add construction code here,
S4O:?^28 // Place all significant initialization in InitInstance
>|T?87 }
XeBSHvO_ ;`bJgSCfo CHookApp theApp;
Q~*3Z4)j LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
U|h@Pw z {
C vTgtZ
' BOOL bProcessed=FALSE;
yC=vTzzp if(HC_ACTION==nCode)
7L:R&W6 {
qf]OSd if((lParam&0xc0000000)==0xc0000000){// Key up
$0iN43WSQ switch(wParam)
Y@%6*uTLa {
m4P=,=% case VK_MENU:
;Wr,VU] MaskBits&=~ALTBIT;
Vo2frWF$ break;
r3 {o_w case VK_CONTROL:
]*;+ U6/? MaskBits&=~CTRLBIT;
"=!QSb break;
{&(bKQ case VK_SHIFT:
]O&A:Us MaskBits&=~SHIFTBIT;
Ip0@Q}^ break;
;v+CQx default: //judge the key and send message
OEGAwP?F break;
oB Bdk@ }
ELNA-ZKp for(int index=0;index<MAX_KEY;index++){
WU,72g= if(hCallWnd[index]==NULL)
Zr2QeLQC( continue;
FkECY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
B
9]sSx {
{78*SR SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Js#c9l{{ bProcessed=TRUE;
`TsfscN }
l1_X5DI }
m~NWY$oI9[ }
Xhkw<XbV else if((lParam&0xc000ffff)==1){ //Key down
&akMj@4;R switch(wParam)
s9:2aLZ{ {
Y.*lO case VK_MENU:
Q}Vho.N@= MaskBits|=ALTBIT;
!%M-w0vC9 break;
:U[_V4?7 case VK_CONTROL:
E 0pF; P5 MaskBits|=CTRLBIT;
C X'E+ break;
s9GPDfZ
case VK_SHIFT:
TAC\2*bWje MaskBits|=SHIFTBIT;
LP)mp cQ break;
ptq{$Y{_ default: //judge the key and send message
u]MF
r2 break;
G7/LY TT) }
Z/RUrYeb for(int index=0;index<MAX_KEY;index++)
u!`C:C' {
]R>k0X.V if(hCallWnd[index]==NULL)
b~1p.J4 continue;
|95/'a* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`oz7Q(` {
".i{WyTt SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
/+1Fa): bProcessed=TRUE;
Oc'z?6axWv }
SCH![Amq }
D\l.?<C }
-MEz`7c~ if(!bProcessed){
x)yf!Dv5$ for(int index=0;index<MAX_KEY;index++){
IFTW,9hh if(hCallWnd[index]==NULL)
RK3/!C`
continue;
=K>Z{%i if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
i:8^:(i SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Cw|SY }
DVcu*UVw }
C[&&.w8Pm }
v_@_J!s return CallNextHookEx( hHook, nCode, wParam, lParam );
EH "g`r }
EXFxiw ;Gs**BB& BOOL InitHotkey()
C;)
xjZiR {
_~(Xd@c( if(hHook!=NULL){
:{
T#M$T nHookCount++;
3ElpS^2W return TRUE;
Mqtp}<*@- }
Wkk Nyg, else
=GVhAzD3 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
7Mv$.Z( if(hHook!=NULL)
VfcQibm nHookCount++;
) IhY&?jk? return (hHook!=NULL);
`s_TY%&_}g }
S+y2eP G BOOL UnInit()
Lb{D5k*XU {
/a|NGh% if(nHookCount>1){
Aii[=x8 nHookCount--;
V$%K=[ return TRUE;
E\S&} K,s }
g\)z!DQ] BOOL unhooked = UnhookWindowsHookEx(hHook);
"\[>@_p h if(unhooked==TRUE){
rw2|1_AF nHookCount=0;
cj#q7 hHook=NULL;
9.=#4OH/ }
n_Y]iAoc` return unhooked;
$bosGG }
lpUtNy xH[yIfHkG@ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~`E4E {
&zcjU+n BOOL bAdded=FALSE;
xlO2jSSAt for(int index=0;index<MAX_KEY;index++){
TMCA?r%Y\ if(hCallWnd[index]==0){
3@?YTez# hCallWnd[index]=hWnd;
\AzcW;03g[ HotKey[index]=cKey;
\W^+vuD8 HotKeyMask[index]=cMask;
.A/H+.H; bAdded=TRUE;
2QRn
c" KeyCount++;
Dg+d=I? break;
8|NJ(D-$ }
K>6k@okO }
lh_zZ!)g return bAdded;
5z ^UQq }
!y~b;>887 vqi$}=%n?W BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
o~&!M_ED {
<SZO-
-+lB BOOL bRemoved=FALSE;
/$,=> for(int index=0;index<MAX_KEY;index++){
1T,PC?vr{ if(hCallWnd[index]==hWnd){
_ng= 5 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
arKmc@"X hCallWnd[index]=NULL;
TF-Ty HotKey[index]=0;
p30&JJ!~" HotKeyMask[index]=0;
'2$!thm bRemoved=TRUE;
gCr|e}w- KeyCount--;
!gfhEzY break;
_C,@eu"9V }
r Ob"S* }
oImgj4C2L }
AWXpA1( return bRemoved;
?lN8~Ze }
n o+tVm| )2Ru!l# void VerifyWindow()
YQdX>k {
$YY)g$ for(int i=0;i<MAX_KEY;i++){
X/K)kIi if(hCallWnd
!=NULL){ RLOQ>vYY
if(!IsWindow(hCallWnd)){ yUmsE-W
hCallWnd=NULL; ]~S+nlyd<
HotKey=0; !LOors za
HotKeyMask=0; g^ $11
KeyCount--; 33'lZubV
} .`>l.gmi&
} q,+kPhHEgy
} t`YZ)>Ws
} aC~n:0v
*8.@aX3
BOOL CHookApp::InitInstance() ]_: TrH
{ uoY`qF.`
AFX_MANAGE_STATE(AfxGetStaticModuleState()); _pko]F|()
hins=AfxGetInstanceHandle(); {hRie+
InitHotkey(); !M&un*
return CWinApp::InitInstance(); Wo9psv7.
} Tb1}XvZ
9_WPWFO
int CHookApp::ExitInstance() L@n6N|[_
{ @U3foL2\
VerifyWindow(); k;_KKvQ
UnInit(); EH*ym#Y
return CWinApp::ExitInstance(); zB6u-4^wT
} ~/jxB)t
v;]I^Kq
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file BT#=Xh
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) TF0-?vBWh
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ hdr}!wV
#if _MSC_VER > 1000 JV]u(PL
#pragma once Ig Vo%)n
#endif // _MSC_VER > 1000 ]ZKt1@4AY
o47 f
class CCaptureDlg : public CDialog ^Z>B/aJq
{ xPDA475Cw3
// Construction F\=Rm
public: '*N9"C
BOOL bTray; l P$r
BOOL bRegistered; 8\)U|/A7
BOOL RegisterHotkey(); e4=FU&RpNH
UCHAR cKey; &xBK\
UCHAR cMask; N`<4:v[P
void DeleteIcon(); $TA6S+
void AddIcon(); _@/C~
UINT nCount; -M:hlwha
void SaveBmp(); }xf='lE
CCaptureDlg(CWnd* pParent = NULL); // standard constructor YF! &*6m
// Dialog Data HLSfoQ&)v
//{{AFX_DATA(CCaptureDlg) k)5_1 y
enum { IDD = IDD_CAPTURE_DIALOG }; -4?xwz9o$7
CComboBox m_Key; i'Y'HI
BOOL m_bControl; 6i]Nr@1C
BOOL m_bAlt; 'o/N}E!Pt
BOOL m_bShift; P('t6MVlT
CString m_Path; "s>fV9YyZ
CString m_Number; 2fzKdkJhe
//}}AFX_DATA %R5Com
// ClassWizard generated virtual function overrides fys5-1@-p
//{{AFX_VIRTUAL(CCaptureDlg) %[Zqr;~l
public: ^)OZ`u8
virtual BOOL PreTranslateMessage(MSG* pMsg); r}oURy,5
protected: 4FIV
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3"'# |6O9
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); rmPne8D=c(
//}}AFX_VIRTUAL lk[G;=K:.
// Implementation B0)`wsb_
protected: 8
_4l"v
p
HICON m_hIcon; 8
)mjy!,
// Generated message map functions -7I1Lh#M
//{{AFX_MSG(CCaptureDlg) #ox9&
virtual BOOL OnInitDialog(); dU ,)TKQ
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $bZu^d,
afx_msg void OnPaint(); *|LbbRu
afx_msg HCURSOR OnQueryDragIcon(); PG6[lHmi
virtual void OnCancel(); )@Zc?Da
afx_msg void OnAbout(); /`+Hwdk
afx_msg void OnBrowse(); k<YtoV
afx_msg void OnChange(); <AI>8j6#B
//}}AFX_MSG c Q(}^KO
DECLARE_MESSAGE_MAP() -XBKOybHBO
}; |;A9A's
#endif DO&+=o`"
83KfM!w
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file h_&4p=SQ
#include "stdafx.h" 3z,v#2
#include "Capture.h" t1e4H=d>
#include "CaptureDlg.h" 01LZE,.
#include <windowsx.h> %bIsrQ~B
#pragma comment(lib,"hook.lib") /~i.\^HX
#ifdef _DEBUG Gr5`1`8|
#define new DEBUG_NEW ~@T+mHny
#undef THIS_FILE X0y?<G1(a
static char THIS_FILE[] = __FILE__; [3j$ 4rP
#endif [8F
\;
#define IDM_SHELL WM_USER+1 LkJ$aW/
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T&1-eq>l
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6IEUJ-M Z
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ycgfZ 3K
class CAboutDlg : public CDialog L]k*QIn:h
{ N9i}p^F<_
public: 5%<TF.;-J
CAboutDlg(); owE<7TGPI?
// Dialog Data 29"mE;j
//{{AFX_DATA(CAboutDlg) EHpu*P~W
enum { IDD = IDD_ABOUTBOX }; YXF#c)#
//}}AFX_DATA O.*jR`l
// ClassWizard generated virtual function overrides {
EA2
//{{AFX_VIRTUAL(CAboutDlg) `nT?6gy
protected: 2BHKS-J*
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W1xf2=z`)T
//}}AFX_VIRTUAL 2Sge
// Implementation pO"m~ mpA
protected: 1^aykrnQ>
//{{AFX_MSG(CAboutDlg) ;"1/#CY773
//}}AFX_MSG &&X$d!V
DECLARE_MESSAGE_MAP() bt;lq!g
}; fd4;mc1T
@&?a]>L
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) W|;nJs:e
{ C@%iQ]=
//{{AFX_DATA_INIT(CAboutDlg) jEUx
q%BH
//}}AFX_DATA_INIT B-!guf
rnY
} 8NnhT E
z>6.[Z(T
void CAboutDlg::DoDataExchange(CDataExchange* pDX) c
Qld$
{ u\`/Nhn
CDialog::DoDataExchange(pDX); ~6p5H}'H1
//{{AFX_DATA_MAP(CAboutDlg) 6|QTS|!
//}}AFX_DATA_MAP /sy-;JDnsu
} csYy7uzi
r+o_t2_b*
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) X*0k>j
//{{AFX_MSG_MAP(CAboutDlg) wi>DZkR
// No message handlers SijtTY#r
//}}AFX_MSG_MAP dIma{uv
END_MESSAGE_MAP() /x$}D=(CZ
g{e/X~
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 21U&Ww
: CDialog(CCaptureDlg::IDD, pParent) >yX/+p_
{ P"b8!k?
//{{AFX_DATA_INIT(CCaptureDlg) d>UnJ)V}
m_bControl = FALSE; R0{Qy*YQ`
m_bAlt = FALSE; !6lOIgn
m_bShift = FALSE; 9+}cE**=d
m_Path = _T("c:\\"); ri: ,q/-
m_Number = _T("0 picture captured."); '}_=kp'X
nCount=0; )&>L !,z
bRegistered=FALSE; q$F) !&
bTray=FALSE; (}G!np
//}}AFX_DATA_INIT Ddb-@YD&+0
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ?fV?|ZGZI
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &1P(O\d
} F"I*-!o
y>`5Kyj3-@
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }7%9}2}Iw
{ kL|\wci
CDialog::DoDataExchange(pDX); rR\;G2p)
//{{AFX_DATA_MAP(CCaptureDlg) Hj2<ZL
DDX_Control(pDX, IDC_KEY, m_Key); [O\9 9>
DDX_Check(pDX, IDC_CONTROL, m_bControl); "9w}dQ
DDX_Check(pDX, IDC_ALT, m_bAlt); &I%IaNco
DDX_Check(pDX, IDC_SHIFT, m_bShift); avg4K*v v
DDX_Text(pDX, IDC_PATH, m_Path); \Dfm(R
DDX_Text(pDX, IDC_NUMBER, m_Number); cM3jnim
//}}AFX_DATA_MAP 0*/kGvw`i
} +,z)#
*#zS^b n
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) m~;B:LN<
//{{AFX_MSG_MAP(CCaptureDlg) CI^[I\$&
ON_WM_SYSCOMMAND() \0nlPXk?G
ON_WM_PAINT() B_hPcmB
ON_WM_QUERYDRAGICON() mg` j[<wp
ON_BN_CLICKED(ID_ABOUT, OnAbout) tU{\ev$x
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 8fh4%#,C%
ON_BN_CLICKED(ID_CHANGE, OnChange) 5Dd:r{{ Q
//}}AFX_MSG_MAP "CBRPp
END_MESSAGE_MAP() #BsW
P].eAAXnP
BOOL CCaptureDlg::OnInitDialog() `kFiH*5 %z
{ r_^)1w
CDialog::OnInitDialog(); Tpb"uBiXoo
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); GV5qdD(
ASSERT(IDM_ABOUTBOX < 0xF000); a$}NW.
CMenu* pSysMenu = GetSystemMenu(FALSE); ytiyF2Kp
if (pSysMenu != NULL) t!jYu<P
{ P3!Atnv2
CString strAboutMenu; KzNm^^#/$A
strAboutMenu.LoadString(IDS_ABOUTBOX); { D+Ym%n
if (!strAboutMenu.IsEmpty()) w.z<60%},0
{ nM8[
pSysMenu->AppendMenu(MF_SEPARATOR); *GJ:+U&m[
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); b!^@PIX
} |NJ}F@t/5
} vQgq]mA?
SetIcon(m_hIcon, TRUE); // Set big icon <!F3s`7~
SetIcon(m_hIcon, FALSE); // Set small icon JaI Kjn
m_Key.SetCurSel(0); aBxiK[[`
RegisterHotkey();
]ENK8bW
CMenu* pMenu=GetSystemMenu(FALSE); s7l23*Czl
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +Ofa#^5);K
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <bP#H
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); rEM#D]k
return TRUE; // return TRUE unless you set the focus to a control at|
\FOKj
} t"|DWC*
-uj3'g(;w
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^s-25 6iI
{ JhP\u3 QE
if ((nID & 0xFFF0) == IDM_ABOUTBOX) h&`y$Jj
{ e>AXXUEf
CAboutDlg dlgAbout; |@wyC0k!
dlgAbout.DoModal(); @^&7$#jq%
} mlB~V3M'G
else moZm0`WR
{ D"^'.DL@wG
CDialog::OnSysCommand(nID, lParam); e)b%`ntF
} gi$XB}L+X
} I ]9C_
\f%.n]>
void CCaptureDlg::OnPaint() C6]OAUXy:F
{ $gvr
-~
if (IsIconic()) ?:uNN
{ VD[pZ2;4
CPaintDC dc(this); // device context for painting "VTF}#Uo
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )R &,'`\
// Center icon in client rectangle DpvrMI~I_
int cxIcon = GetSystemMetrics(SM_CXICON); <#*.}w~
int cyIcon = GetSystemMetrics(SM_CYICON); w7
*V^B
CRect rect; )/>A6A:
GetClientRect(&rect); ~*-qX$gr
int x = (rect.Width() - cxIcon + 1) / 2; `5l01nOxJ
int y = (rect.Height() - cyIcon + 1) / 2; WbcS: !0
// Draw the icon 4TZ cc|B5
dc.DrawIcon(x, y, m_hIcon); J#
EP%
} :c=.D;,
else cbYK5fj"T
{ (s&&>M]r_
CDialog::OnPaint(); ?JXa~.dA
} UQPU"F7.
} 5jZiJw(
E ]f)Os$
HCURSOR CCaptureDlg::OnQueryDragIcon() :mZYS4L~
{ `]<`$71w
return (HCURSOR) m_hIcon; Fe!9y2Mg
} fzPZ|
|]sx+NlNc
void CCaptureDlg::OnCancel() {dzoEM[
1s
{ =;ICa~`C;
if(bTray)
3+U]?7t
DeleteIcon(); K0Tg|9
CDialog::OnCancel(); yWb4Ify
} .zkP~xQ~
Md&WJ
};L
void CCaptureDlg::OnAbout() k\aK?(.RC7
{ ahGT4d`)9
CAboutDlg dlg; /XbW<dfl
dlg.DoModal(); m4m<nnM
} G;1?<3
S
v`qB'e2
void CCaptureDlg::OnBrowse() MbA\pG'T
{ 4 b,N8
CString str; 2?DRLF]
BROWSEINFO bi; {x@|VuL=
char name[MAX_PATH]; xDjV`E]
ZeroMemory(&bi,sizeof(BROWSEINFO)); T?wzwGp-[
bi.hwndOwner=GetSafeHwnd(); |"Z{I3Umg
bi.pszDisplayName=name; <+tD z (
bi.lpszTitle="Select folder"; Adx`8}N8
bi.ulFlags=BIF_RETURNONLYFSDIRS; {y-^~Q"z
LPITEMIDLIST idl=SHBrowseForFolder(&bi); rRb+_]Lg
if(idl==NULL) eUBrzoCO
return; ~ ?^/u8
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); | C+o;
str.ReleaseBuffer(); VR0=SE
m_Path=str; 1cC1*c0Z
if(str.GetAt(str.GetLength()-1)!='\\') c0rk<V%5+
m_Path+="\\"; m9":{JI.w
UpdateData(FALSE); Im?LIgt$
} 'EhBRU%
L%h/OD
void CCaptureDlg::SaveBmp() >I'%!E;
{ i.y)mcB4
CDC dc; l=={pb
dc.CreateDC("DISPLAY",NULL,NULL,NULL); +%0z`E\?M#
CBitmap bm; bS!\#f%9"
int Width=GetSystemMetrics(SM_CXSCREEN); vjUp *R>h
int Height=GetSystemMetrics(SM_CYSCREEN); iiC!|`k"
bm.CreateCompatibleBitmap(&dc,Width,Height); C9~~O~7x
CDC tdc; #Dy?GB08
tdc.CreateCompatibleDC(&dc); X#p Wyo~
CBitmap*pOld=tdc.SelectObject(&bm); TqAPAHg
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); BmBz}:xMez
tdc.SelectObject(pOld);
%X1x4t]
BITMAP btm; z`3( ,V
bm.GetBitmap(&btm); l67Jl"v
DWORD size=btm.bmWidthBytes*btm.bmHeight; diT=x52
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |ys0`Vb=$
BITMAPINFOHEADER bih; NXk!qGV2
bih.biBitCount=btm.bmBitsPixel; p,W_'?,9
bih.biClrImportant=0; <48<86TP
bih.biClrUsed=0; \}"m'(\c
bih.biCompression=0; =Lp7{09u
bih.biHeight=btm.bmHeight; 3$/ 4wH^
bih.biPlanes=1; q3w1GD
bih.biSize=sizeof(BITMAPINFOHEADER); +OHGn;C
bih.biSizeImage=size; U1R4x!ym4
bih.biWidth=btm.bmWidth; E6MA?Ax&=
bih.biXPelsPerMeter=0; 5.0e~zlM-
bih.biYPelsPerMeter=0; elPE%'
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); S::>N.y
static int filecount=0; K_&MoyJJ9f
CString name; 9S7A!AKE
name.Format("pict%04d.bmp",filecount++); h2q/mi5{
name=m_Path+name; >Aq:K^D/3F
BITMAPFILEHEADER bfh; zJN7<sv
bfh.bfReserved1=bfh.bfReserved2=0; BlC<`2S
bfh.bfType=((WORD)('M'<< 8)|'B'); xL
"!~dN
bfh.bfSize=54+size; >SmV74[s2
bfh.bfOffBits=54; CNrIIsJ
CFile bf; []pN$]+c
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #f,y&\Xmf
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); \2v"YVWw
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); zu\`1W^
bf.WriteHuge(lpData,size); 6,b"
bf.Close(); j<yiNHC
nCount++; P 7D!6q
} F7}-!
GlobalFreePtr(lpData); _e<o7Y@_
if(nCount==1) T6BFX0$
m_Number.Format("%d picture captured.",nCount); A#y@`}]!'
else r ,(Mu
m_Number.Format("%d pictures captured.",nCount); 8p^B hd
UpdateData(FALSE); V!/:53
} z8_XX$Mnt
KOSM]c\H
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) t0E 51Ic@
{ A*yi"{FLi
if(pMsg -> message == WM_KEYDOWN) ;{Ux_JEg
{ Kq6jw/T
if(pMsg -> wParam == VK_ESCAPE) mI1H!
return TRUE; p*3; hGp6
if(pMsg -> wParam == VK_RETURN) Sv[ 5NZn0&
return TRUE; &(pjqV
} *ZCn8m:-+
return CDialog::PreTranslateMessage(pMsg); _2ef LjXQ
} ~mz%E
@mQ:7-,~
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9J-b6,
{ %VNlXHO.
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ r7mD{0s*
SaveBmp(); ",qU,0
return FALSE; :D:DnVZ-[@
} f>$``.O
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Wd,a?31|
CMenu pop; 2tQ`/!m>v$
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $&I'o
CMenu*pMenu=pop.GetSubMenu(0); 5g5'@vMN
pMenu->SetDefaultItem(ID_EXITICON); umEVy*hc
CPoint pt; va)%et0!
GetCursorPos(&pt); n~IVNB*
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1OaXo!
if(id==ID_EXITICON) W8WXY_yJt
DeleteIcon(); kAYb!h[`
else if(id==ID_EXIT) B9dt=j3j2
OnCancel(); 1 jb/o5n;
return FALSE; F\JUx L@8
} K95;rd
LRESULT res= CDialog::WindowProc(message, wParam, lParam); <'U]`Lp
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Qx3eLfm
AddIcon(); \%jVg\4'
return res; ,\)a_@@k
} +>f<EPGn
"y?\Dx
void CCaptureDlg::AddIcon() ._Zt=jB
{ mu]as: ~
NOTIFYICONDATA data; f:JlZ&
data.cbSize=sizeof(NOTIFYICONDATA); p<Z3tD;Z
CString tip; )u:Q)
%$t
tip.LoadString(IDS_ICONTIP); #o`Ny4sq/
data.hIcon=GetIcon(0); (]2H7X:b
data.hWnd=GetSafeHwnd(); PXKJ^fa
strcpy(data.szTip,tip); <cN~jv-w$
data.uCallbackMessage=IDM_SHELL; m:QG}{<.h
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /! ajsn
data.uID=98; F'RUel_%
Shell_NotifyIcon(NIM_ADD,&data); =3xE:
ShowWindow(SW_HIDE); QP@<)`1t9
bTray=TRUE; iP@6hG`:
} iPG0o
%
*~XA'Vw!
void CCaptureDlg::DeleteIcon() Kb;dKQ
{ /7c~nBU
NOTIFYICONDATA data; RBKOM$7
data.cbSize=sizeof(NOTIFYICONDATA); :*514N
data.hWnd=GetSafeHwnd(); ]jMKC8uz
data.uID=98; dtStTT
Shell_NotifyIcon(NIM_DELETE,&data); T.e.{yO
ShowWindow(SW_SHOW); 7j<e)"
SetForegroundWindow(); Dr3n+Q
ShowWindow(SW_SHOWNORMAL); m|tC24
bTray=FALSE; DbI!l`Vn4
} v5}X+'
2!1.E5.I
void CCaptureDlg::OnChange() Rfb?f}j
{ hS [SRa'.
RegisterHotkey(); #Il_J\#
} t0&@h\K
SuBeNA[&
BOOL CCaptureDlg::RegisterHotkey() IXLO>>`
{ EV M7Q>
UpdateData(); NcS.49
UCHAR mask=0; ;Y9=!.Ak0y
UCHAR key=0; zk_Eb?mhwV
if(m_bControl) :Sg&0Wj+#j
mask|=4; .>g1$rj
if(m_bAlt) 6aO2:|:yP
mask|=2; +\
_{x/u1
if(m_bShift) h+~P"i}&\
mask|=1; K-vWa2
key=Key_Table[m_Key.GetCurSel()]; H;ZHqcUX
if(bRegistered){ 7u.|XmUz
DeleteHotkey(GetSafeHwnd(),cKey,cMask); \`.F\Z
bRegistered=FALSE; E8\XNG)V4
} -[7O7'
cMask=mask; RSfM]w}Hq#
cKey=key; Ji'(`9F&a
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D|bBu
return bRegistered; rt7<Q47QE
} rM}0%J'
S:Q! "U
四、小结 ~^I>#Dd
>>Ar$
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。