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:
z\/53Sy<
.]|Zf!>}s 一、实现方法
K"2|[ 5 p$k\m|t 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
G]Jz"xH# >x[`;O4 #pragma data_seg("shareddata")
g8'DoHJ* HHOOK hHook =NULL; //钩子句柄
@S 6u9v UINT nHookCount =0; //挂接的程序数目
D^Ys)- d static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
I|/'Ds: static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
@+_&Y] static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
y)F!c29 static int KeyCount =0;
= c~I
. static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
gNx+>h`AF #pragma data_seg()
uvA(Rn PzY)"]g 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
Yn9j-` A.Bk/N1G DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
Iwpbf Z Qeb}!k2A BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
xiyxrR; cKey,UCHAR cMask)
\O7J=6fn {
XV'fW~j\ BOOL bAdded=FALSE;
yW.COWL=) for(int index=0;index<MAX_KEY;index++){
L<(VG{)Z if(hCallWnd[index]==0){
Zwe[_z!*D hCallWnd[index]=hWnd;
k*-NsNPw$ HotKey[index]=cKey;
3hq1yyec HotKeyMask[index]=cMask;
~k'V*ERNSj bAdded=TRUE;
>m_v5K KeyCount++;
dZ:r&Qa break;
nEy]` }
tk/`%Q }
Y~n`~( return bAdded;
fn9#>~vrD }
s%;<O:x8o //删除热键
:G)<}j"sM BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}iIbcA {
`eRLc}aP2 BOOL bRemoved=FALSE;
J<JBdk for(int index=0;index<MAX_KEY;index++){
qvt- if(hCallWnd[index]==hWnd){
KIL18$3J if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)qPSD2h hCallWnd[index]=NULL;
R#4^s HotKey[index]=0;
2r];V'r HotKeyMask[index]=0;
zL s^,x bRemoved=TRUE;
j.3o W KeyCount--;
,2 WH/" break;
m%QqmTH }
|ia@,*KD }
ykq'g| }
.V%*{eHLL return bRemoved;
>kdM:MK }
OR+A_:c.D =hw^P%Zn 9u wL{P& DLL中的钩子函数如下:
4FA|[An [V@yRWI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
"7?js $ {
OoP@-D"e BOOL bProcessed=FALSE;
{U
<tc4^ if(HC_ACTION==nCode)
rbk<z\pc {
!Y;<:zx5 if((lParam&0xc0000000)==0xc0000000){// 有键松开
~,}s(`~ switch(wParam)
LCQkgRs}~{ {
'o\;x"YJ case VK_MENU:
;mO,3dV MaskBits&=~ALTBIT;
L(WOet( ' break;
_g6m=N4 case VK_CONTROL:
Sb^
b)q" MaskBits&=~CTRLBIT;
A|<; break;
|#TXE|#ux case VK_SHIFT:
$cK^23H/Fj MaskBits&=~SHIFTBIT;
7;HUE!5,^l break;
;.Zh,cU default: //judge the key and send message
N4 [E~- break;
:$"7-a%f }
R'EW7}& for(int index=0;index<MAX_KEY;index++){
U($^E}I2( if(hCallWnd[index]==NULL)
L? ;/cO^ continue;
,0T)Oc|HL/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-
8syjKTg {
<q7s`,rG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
\7E`QY4 bProcessed=TRUE;
0~xaUM` }
X}apxSd" }
*1;23BiH- }
#J+\DhDEPO else if((lParam&0xc000ffff)==1){ //有键按下
uFe'$vI switch(wParam)
/!bx`cKG {
[:i sZG* case VK_MENU:
R^9"N?Q7;` MaskBits|=ALTBIT;
,o&<WMD break;
96W4c]NT case VK_CONTROL:
md6*c./Z MaskBits|=CTRLBIT;
3%NE/lw1 break;
K<,Y^3]6? case VK_SHIFT:
N&B>#: MaskBits|=SHIFTBIT;
dy_.(r5[L] break;
\r]('x3S default: //judge the key and send message
Za\RM[Z!I break;
fH!=Zb_{8 }
a R#Cot for(int index=0;index<MAX_KEY;index++){
'?R =P if(hCallWnd[index]==NULL)
nx :)k-p_[ continue;
I2*oTUSik if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|p'i,.(c_W {
(^S5Sc= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`9EVB; bProcessed=TRUE;
2nx8iA
}
tG 7+7Z= }
zZYHc?Z }
-ddOh<U> if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
s1@@o#r for(int index=0;index<MAX_KEY;index++){
ew"m!F# if(hCallWnd[index]==NULL)
B_@7IbB continue;
6ZHv,e`? if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
|Y4q+sDW SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
dKe@JQ+-z //lParam的意义可看MSDN中WM_KEYDOWN部分
x=3I)}J(kn }
Ij$)RSPtH }
NlFo$Y }
a&:>Ped" return CallNextHookEx( hHook, nCode, wParam, lParam );
rHo6iJj }
)GCLK<,swu Et0&E 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:
y(a}IM3~ 9R:(^8P8 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
VLd=" ~ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Rc%PZ}es fSC.+,qk 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:
`g8tq 3It8&x: LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
%f#\i#G<k {
Jh(mbD if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
2_Jb9:/X {
DD6 'M
U4 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
%((cFQ9 SaveBmp();
T=yCN#cqQ` return FALSE;
i\Q":4 }
PE7t_iSV …… //其它处理及默认处理
>!G5]?taa }
E$&;]a .)nCOwR6p HqDa2q4 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
U*xxrt/On/ ,"C&v~ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
^B6`e^< jM;d>Gymx 二、编程步骤
fcn_<Yh0W =~;zVP 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
YL!oF^XO SFOQM*H 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
]d~MEa9Y| aH9L|BN* 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
QJ6f
EV$~ {8W |W2o$! 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
]:Wb1 hAYQ6g$A 5、 添加代码,编译运行程序。
{vCU^BN,k i|[S5QXCh 三、程序代码
}cyq'mi 5M]6'X6I ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
dfXV1B5 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
hiT9H5 6> #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
vatx+) #if _MSC_VER > 1000
yW'BrTw
#pragma once
l!Nvn$hm #endif // _MSC_VER > 1000
wN$uX#W| #ifndef __AFXWIN_H__
Y}*Ctdrl #error include 'stdafx.h' before including this file for PCH
~91uk3ST? #endif
#0xm3rFy4 #include "resource.h" // main symbols
baA HP" class CHookApp : public CWinApp
mT}Aje-L {
I(F1S,7 public:
T`j CHookApp();
mq>*W'M // Overrides
Pau&4h0 // ClassWizard generated virtual function overrides
ok8JnQC //{{AFX_VIRTUAL(CHookApp)
6eVe}V4W public:
InTKdr^ P virtual BOOL InitInstance();
^?JEyY virtual int ExitInstance();
8j({=xbg& //}}AFX_VIRTUAL
u_$6LEp- //{{AFX_MSG(CHookApp)
H7 o$O // NOTE - the ClassWizard will add and remove member functions here.
9L UP{(uq // DO NOT EDIT what you see in these blocks of generated code !
9$}+-Z //}}AFX_MSG
5LnB]dW DECLARE_MESSAGE_MAP()
a .B\=3xn };
JB: mbH LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
1WZKQeOo BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
'bd=,QW BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
~6pCOS} BOOL InitHotkey();
+X4ttv BOOL UnInit();
E9
:|8#b #endif
:X]lXock0 ]*t*/j;N //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
`3H?*\<( #include "stdafx.h"
AF07KA# #include "hook.h"
C[HE4xF6 #include <windowsx.h>
`RL(N4H #ifdef _DEBUG
INeWi= 1 #define new DEBUG_NEW
?.|wfBI #undef THIS_FILE
X_EC:GU static char THIS_FILE[] = __FILE__;
#m[w=Pu} #endif
` Mv5!H5l #define MAX_KEY 100
Z\oAE<$ #define CTRLBIT 0x04
0 VWCm( f- #define ALTBIT 0x02
lu9Ir>c #define SHIFTBIT 0x01
{jCu9 ]c! #pragma data_seg("shareddata")
!S$oaCxM HHOOK hHook =NULL;
}r\SP3 UINT nHookCount =0;
XJV3oj static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Uz m[e%/` static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
)x5$io
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
"m\UqQGX static int KeyCount =0;
lMI
ix0sSj static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
d(dw]6I6 #pragma data_seg()
g~WNL^GGS HINSTANCE hins;
b{ubp void VerifyWindow();
S|Ij q3 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
NUO,"Bqq //{{AFX_MSG_MAP(CHookApp)
FcbA)7dD // NOTE - the ClassWizard will add and remove mapping macros here.
jwtXI\@MS // DO NOT EDIT what you see in these blocks of generated code!
fQ?n( //}}AFX_MSG_MAP
8u~\]1( END_MESSAGE_MAP()
IU;pkgBj0Y :pV("tHE CHookApp::CHookApp()
PK|`}z9 {
Z-;uzx // TODO: add construction code here,
n?ZH2dI\0 // Place all significant initialization in InitInstance
Ozh^Q$>u }
|rms[1<_ #uDBF CHookApp theApp;
>8{`q!=|~ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
l%)=s~6z {
Wcay'#K, BOOL bProcessed=FALSE;
n3@g{4~ if(HC_ACTION==nCode)
0e5-\a {
>t6'8g"T if((lParam&0xc0000000)==0xc0000000){// Key up
7;#dX~>@{ switch(wParam)
OYRR'X.E {
vN6]6nUOiT case VK_MENU:
~Hs]} Xo MaskBits&=~ALTBIT;
w[$Wpae break;
![."xHVeL case VK_CONTROL:
]FnrbQ| MaskBits&=~CTRLBIT;
9gIJX? break;
xuH<=-O>ki case VK_SHIFT:
a\2Myj MaskBits&=~SHIFTBIT;
rF
j)5~ break;
Y.hH
fSp default: //judge the key and send message
|LGNoP}SA break;
uB)6\fkTB }
y<LwrrJ> for(int index=0;index<MAX_KEY;index++){
A#07Ly8kXn if(hCallWnd[index]==NULL)
GLcZ=6)"' continue;
PQI,vr'R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
K]]rOF {
@p'v.;~# SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
6+d"3-R. bProcessed=TRUE;
_ JJ0pc9t }
,/?V+3l }
%TggNU, }
V6!73 iY else if((lParam&0xc000ffff)==1){ //Key down
OL9C#er switch(wParam)
WD do{ {
<rI$"=7 case VK_MENU:
.aH?H]^ MaskBits|=ALTBIT;
OcS`Fxs break;
->25$5# case VK_CONTROL:
KI QBY!N+ MaskBits|=CTRLBIT;
<T% hfW break;
Pds*M?&F case VK_SHIFT:
5dEO_1q
% MaskBits|=SHIFTBIT;
%v)'`|i break;
Wjk;"_"gd default: //judge the key and send message
)Is*-
W break;
ik NFW*p }
|0!97*H5 for(int index=0;index<MAX_KEY;index++)
`hf9rjy4 {
(_5+`YsV if(hCallWnd[index]==NULL)
5BO!K$6 continue;
@Lv_\^2/} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>f05+%^[ {
Sqt"G6< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
$^aXVy5p bProcessed=TRUE;
Q+M3Pqy }
w%-!dbmb% }
)g<qEyJR }
*B}R4Y|g if(!bProcessed){
SF=|++b1f for(int index=0;index<MAX_KEY;index++){
Y6DiISl if(hCallWnd[index]==NULL)
9)hC,)5 continue;
*
rANf&y if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
LVtQ^ 5>8 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
o%4+I> }
ul&7hHp_u% }
P(+ar#,G }
C:EoUu return CallNextHookEx( hHook, nCode, wParam, lParam );
_[tBLGXD }
?0&>?-? u"|nu!p` BOOL InitHotkey()
phSP+/w {
2g==98>cg if(hHook!=NULL){
xT>V;aa\ nHookCount++;
\$UU/\ return TRUE;
IT33E%G }
Gukq}ZQ d else
'(>N
gd[ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
JPzPL\ if(hHook!=NULL)
lV="IP^7 nHookCount++;
{IwYoR aXa return (hHook!=NULL);
^O"`.2O1 }
_{);n$ ` BOOL UnInit()
\bE~iz3b9 {
YI+|6s[ if(nHookCount>1){
q=(wK& nHookCount--;
M#|xj <p return TRUE;
G;+0V0K }
$a1.c;NE' BOOL unhooked = UnhookWindowsHookEx(hHook);
BpE[9N if(unhooked==TRUE){
`Y9@ ?s Q nHookCount=0;
|zlwPi. hHook=NULL;
5=e@yIr'# }
c5u?\ return unhooked;
m0YDO0 }
v\u+=}rl }wKU=Vm BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
9m>_qWaA {
EA72%Y9F BOOL bAdded=FALSE;
:-n4!z"k for(int index=0;index<MAX_KEY;index++){
Fx 2&ji6u if(hCallWnd[index]==0){
(>'d`^kjk hCallWnd[index]=hWnd;
)^AO?MW HotKey[index]=cKey;
elQ44)TrQ HotKeyMask[index]=cMask;
Ft7l / bAdded=TRUE;
Dc5XU3Eu` KeyCount++;
s RB8 jY break;
E O^0sF< }
kS>j!U(%d }
ygG9ht return bAdded;
ektFk"W3A\ }
r\?*?sL EhoR. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+ `xp+Q {
XCY4[2*a> BOOL bRemoved=FALSE;
I;LqyzM for(int index=0;index<MAX_KEY;index++){
4l:+>U@KU if(hCallWnd[index]==hWnd){
es{
9[RHK if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
W%x#ps5% hCallWnd[index]=NULL;
ZO}*^ HotKey[index]=0;
5NK:94&JE HotKeyMask[index]=0;
"wc $'7M bRemoved=TRUE;
~j_H2+! KeyCount--;
dx#N)? break;
?*HlAVDcFT }
i "xq SLf= }
uM$=v]e^4 }
AkF3F^ return bRemoved;
wP'`!O[W }
sz5@= f/xBR"' void VerifyWindow()
\%(R~H {
;1WclQ!( for(int i=0;i<MAX_KEY;i++){
7G(X:! if(hCallWnd
!=NULL){ b/)UN*~
if(!IsWindow(hCallWnd)){ 1*5n}cU~
hCallWnd=NULL; 3!I8J:GZ:
HotKey=0; 4)?c[aC4P
HotKeyMask=0; GY>0v
KeyCount--; a^N/N5-Z
} QP'*
)gjO7
} @#p4QEQA
} cI H`,bR
} }w$/x<Q[
p^2pv{by
BOOL CHookApp::InitInstance() RZ -w,~
{ e.Ii@<
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?r/7:
hins=AfxGetInstanceHandle(); Z@>>ZS1Do
InitHotkey(); kG{(Qi
return CWinApp::InitInstance(); u%2u%-w
} 6;VlX,,j
sM4N`$Is23
int CHookApp::ExitInstance() 3B,nHU
{ uzsR*x%s-
VerifyWindow(); YO=;)RA
UnInit(); +_+_`q>]
return CWinApp::ExitInstance(); 9F3`hJZRy>
} zX3O_
C~
>'pS6%5
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?p`}6s Q}
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) E3`KO'v%
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !0cfz5t
#if _MSC_VER > 1000 yfV{2[8ux
#pragma once gxJ(u{2
#endif // _MSC_VER > 1000
X(bb1
&Zov9o:gx
class CCaptureDlg : public CDialog :QN,T3i'/3
{ \4V'NTjB
// Construction Odagaca
public: G G7N!eZ
BOOL bTray; seJc,2Ex
BOOL bRegistered; <>-UPRwqI
BOOL RegisterHotkey(); "<=^Sm
UCHAR cKey; A:N!H_x
UCHAR cMask; ]RxNSr0e
void DeleteIcon(); Um%E/0j
void AddIcon(); DRw%~
UINT nCount; 7%JXVP}A
void SaveBmp(); ^y&l!,(A
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Y5K!DMKY
// Dialog Data X]`\NNx
//{{AFX_DATA(CCaptureDlg) 7/Ew(X8Fs
enum { IDD = IDD_CAPTURE_DIALOG }; tr):n@
CComboBox m_Key; C}45ZI4
BOOL m_bControl; rsrv1A=t?
BOOL m_bAlt; jk) U~KGcg
BOOL m_bShift; qbB.Z#w
CString m_Path; GJ!usv u
CString m_Number; {Ke3
//}}AFX_DATA l46O=?usDX
// ClassWizard generated virtual function overrides w
W-GBY3
//{{AFX_VIRTUAL(CCaptureDlg) H3MT.Cpd
public: ARslw*SJ
virtual BOOL PreTranslateMessage(MSG* pMsg); K{HdqmxL.I
protected:
c,x2
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xOP\ +(
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); S&@~F|
//}}AFX_VIRTUAL ZN^9w"A
// Implementation =w,%W^"E
protected: z.#gpTXD
HICON m_hIcon; R(ay&f%E
// Generated message map functions `4XfT.9GT
//{{AFX_MSG(CCaptureDlg) "x&H*"
virtual BOOL OnInitDialog(); MwXgaSV
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); M,|o 2'
afx_msg void OnPaint(); OpYq qBf_
afx_msg HCURSOR OnQueryDragIcon(); *j8w"
4
virtual void OnCancel(); >KC*xa"
afx_msg void OnAbout(); ,1QU
afx_msg void OnBrowse(); E/Y.f
afx_msg void OnChange(); ePB=aCZ
//}}AFX_MSG R~)c(jj5
DECLARE_MESSAGE_MAP() 6$2)m;| XY
}; to+jQ9q8
#endif L2AZ0E"ub
Oxy.V+R
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file eRC@b^~
#include "stdafx.h" ,odjL6u
#include "Capture.h" G`gYwgU;
#include "CaptureDlg.h" 2=u5N[*
#include <windowsx.h> v-4eN1OS
#pragma comment(lib,"hook.lib") )";g*4R[
#ifdef _DEBUG H?M8j] R-)
#define new DEBUG_NEW Wv$e/N`l
#undef THIS_FILE G,$RsP
static char THIS_FILE[] = __FILE__; O" n /.`
#endif ln#Lx&r;|
#define IDM_SHELL WM_USER+1 MhHygZT[}
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ad }^Dj/
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n+j'FfSz
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hZ5h(CQ?"#
class CAboutDlg : public CDialog X|@|ZRN
{ N^CD4l
public: zd"o #(sv
CAboutDlg(); g@KS\.m]
// Dialog Data =)(sN"%
//{{AFX_DATA(CAboutDlg) 4: 5 CnK
enum { IDD = IDD_ABOUTBOX }; i{!i%`"
//}}AFX_DATA GYyP+7K4l[
// ClassWizard generated virtual function overrides dy#dug6j
//{{AFX_VIRTUAL(CAboutDlg) "{AS5jw
protected: YjoN:z`b
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support teQ%t~PJ-&
//}}AFX_VIRTUAL 3QZw
// Implementation ;Rt?&&W
protected: \HV%579
//{{AFX_MSG(CAboutDlg) +Q8Bin
//}}AFX_MSG zf4@:GM`
DECLARE_MESSAGE_MAP() cdf8YN0!
}; ~;3N'o
O5LB&s
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (KK9/k
{ DU|0#z=*t5
//{{AFX_DATA_INIT(CAboutDlg) b-;+&Rb
//}}AFX_DATA_INIT Zii<jZ.)<
} zl=RK
v](7c2;
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
3QL'uk
{ 1#&*xF"
CDialog::DoDataExchange(pDX); 2~K.m@U}!Z
//{{AFX_DATA_MAP(CAboutDlg) ZS4lb=)G
//}}AFX_DATA_MAP qWfG@hn
} 6&`.C/"2
Yvcd(2
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rH8w||S2U
//{{AFX_MSG_MAP(CAboutDlg) JD^(L~ n]
// No message handlers Q!(C$&f
//}}AFX_MSG_MAP 9axJ2J'g
END_MESSAGE_MAP() CVyqr_n65/
Sdy\s5
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 6NVf&;laQ
: CDialog(CCaptureDlg::IDD, pParent) Mp:tcy,*
{ %}MZWf{
//{{AFX_DATA_INIT(CCaptureDlg) X@*$3z#Z
m_bControl = FALSE; 1l"A7
V
m_bAlt = FALSE; cP''
m_bShift = FALSE; L6fc_Mo.EE
m_Path = _T("c:\\"); >sv|
m_Number = _T("0 picture captured."); kQxY"HD
nCount=0; !i&^H,
bRegistered=FALSE; <iajtq<Z
bTray=FALSE; DK}k||-
//}}AFX_DATA_INIT Hc ]/0:
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >%h_ R:
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); %fGS< W;
} #joGIw
"6Hka{
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ==F[5]?
{ R%Gh4y\nF
CDialog::DoDataExchange(pDX);
n4h@{Xg
//{{AFX_DATA_MAP(CCaptureDlg) }xJ9EE*G/
DDX_Control(pDX, IDC_KEY, m_Key); Uvgv<OR`_
DDX_Check(pDX, IDC_CONTROL, m_bControl); %=xR$<D
DDX_Check(pDX, IDC_ALT, m_bAlt); UN>!#Ji:$
DDX_Check(pDX, IDC_SHIFT, m_bShift); Iw(deD
DDX_Text(pDX, IDC_PATH, m_Path); dq%7A=-
DDX_Text(pDX, IDC_NUMBER, m_Number); u.YPb@
//}}AFX_DATA_MAP zRbooo{N
} L1D{LzlBti
"45O!AjP
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) I2hX;pk,
//{{AFX_MSG_MAP(CCaptureDlg) h@7Shp
ON_WM_SYSCOMMAND() zM%ILv4
ON_WM_PAINT() ;Oh4W<hH}
ON_WM_QUERYDRAGICON() <7fF9X
ON_BN_CLICKED(ID_ABOUT, OnAbout) x48Y#"'
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *lRP ZN
ON_BN_CLICKED(ID_CHANGE, OnChange) TK<~(Dk
//}}AFX_MSG_MAP QijEb
END_MESSAGE_MAP()
+ulBy
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BOOL CCaptureDlg::OnInitDialog() 2siUpmX
{ /.l8Jb4
CDialog::OnInitDialog(); ?}\aG3_4
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /bv`_>
ASSERT(IDM_ABOUTBOX < 0xF000); u1s^AW8 y
CMenu* pSysMenu = GetSystemMenu(FALSE); C2NJrg4(
if (pSysMenu != NULL) p8o
~
{ 3&.?9
CString strAboutMenu; ?W-J2tgss{
strAboutMenu.LoadString(IDS_ABOUTBOX); y
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if (!strAboutMenu.IsEmpty()) &;S.1tg
{ c-.t8X,5(~
pSysMenu->AppendMenu(MF_SEPARATOR); pMnkh}Q#
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); o<ak&LX`9
} mk.:V64 >;
} ]CsF} wr'z
SetIcon(m_hIcon, TRUE); // Set big icon Z?
u\
SetIcon(m_hIcon, FALSE); // Set small icon ]`)50\pdw
m_Key.SetCurSel(0); S7&w r@
RegisterHotkey(); P -0
CMenu* pMenu=GetSystemMenu(FALSE); 9r=@S
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); xtMN<4#E
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); xzTTK+D@
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); L"6qS3 [=
return TRUE; // return TRUE unless you set the focus to a control NPy{ =#k4
} y33+^
RO?5WJpPj
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) d%VG@./xq
{ T8+A`z=tSb
if ((nID & 0xFFF0) == IDM_ABOUTBOX) . #`lW7
{ ;Nf5,D.D
CAboutDlg dlgAbout; jH#Tt;
dlgAbout.DoModal(); ykcW>h
} 6!7LgM%4
else 1Y!"C
{ g BfYm
CDialog::OnSysCommand(nID, lParam); ZLw7-H6Fh
} IH8^ fyQ`
} M7!>-P
%>B?WR\yE
void CCaptureDlg::OnPaint() -02cI}e
{ D{g6M>,\
if (IsIconic()) +ptVAg+
{ 3;(;'5|Z
CPaintDC dc(this); // device context for painting ?n<b:oO
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); l6Wa~ E
// Center icon in client rectangle LN}eD\
int cxIcon = GetSystemMetrics(SM_CXICON); Nr)v!z~y
int cyIcon = GetSystemMetrics(SM_CYICON); ][3H6T!ckL
CRect rect; pwAawm
GetClientRect(&rect); !i=LQUi.
int x = (rect.Width() - cxIcon + 1) / 2; 8?#4<4Ql8
int y = (rect.Height() - cyIcon + 1) / 2; Kcv7C{-/
// Draw the icon A.tONPi
dc.DrawIcon(x, y, m_hIcon); j]th6
} |6/k2d{,(
else 6'
}oo'#~
{ .v;$sst5y
CDialog::OnPaint(); P @N7g`u3}
} >MD['=J[d
} 6U[`CGL66
t=M:L[bis;
HCURSOR CCaptureDlg::OnQueryDragIcon() ZYDLl8
{ a_Y*pOu
return (HCURSOR) m_hIcon; dU%Q=r8R
} ?oF+?l
]G.ttfC
void CCaptureDlg::OnCancel() :ad
{ +k|t[N
if(bTray) JW[y
DeleteIcon(); 5ZeE& vG2
CDialog::OnCancel(); l",JN.w
} *6D0>F
_aa3;kT_
void CCaptureDlg::OnAbout() 1|$V
{ [iVCorU
CAboutDlg dlg; iq'hel
dlg.DoModal(); xL8r'gV@
} 3db ,6R
Sc03vfmo"N
void CCaptureDlg::OnBrowse() }z{2~ 0,
{ ^Xv_y+
CString str; 4FSA:]o-
BROWSEINFO bi; wG;#L7%
char name[MAX_PATH]; H]&a}WQ_
ZeroMemory(&bi,sizeof(BROWSEINFO)); &4 Py
bi.hwndOwner=GetSafeHwnd(); / blVm1F
bi.pszDisplayName=name; (T;4'c
bi.lpszTitle="Select folder"; ?/ xk
bi.ulFlags=BIF_RETURNONLYFSDIRS; k"_i7
LPITEMIDLIST idl=SHBrowseForFolder(&bi); On
x[}x
if(idl==NULL) K;,zE6WD$$
return; lbM)U
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); A[lbBR
str.ReleaseBuffer(); d%1Tv1={
m_Path=str; ~uy{6U{&I
if(str.GetAt(str.GetLength()-1)!='\\') [vM ksHk4
m_Path+="\\"; $|+q9o\
UpdateData(FALSE); iSDE6
} | R MIV
Py2AnpYa
void CCaptureDlg::SaveBmp() 7|4t;F!
{ ]7<}EG
CDC dc; lS"g[O+
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 69#mj*p@+
CBitmap bm; mS?.xu
int Width=GetSystemMetrics(SM_CXSCREEN); K@av32{
int Height=GetSystemMetrics(SM_CYSCREEN); Ln6\Iis
bm.CreateCompatibleBitmap(&dc,Width,Height); G.v zz-yG
CDC tdc; q@K8,=/.#
tdc.CreateCompatibleDC(&dc); !RX\">z
CBitmap*pOld=tdc.SelectObject(&bm); 05=
$Dnv
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /{Ff)<Q.Z
tdc.SelectObject(pOld); 7&oT}Z
BITMAP btm; 'Cw&9cL9w
bm.GetBitmap(&btm); b[5$$_[
DWORD size=btm.bmWidthBytes*btm.bmHeight; `/ ]Th&(5
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #p'Xq
}]
BITMAPINFOHEADER bih; +ob<?
T
bih.biBitCount=btm.bmBitsPixel; 9 0PF)U
bih.biClrImportant=0; _dQVundH
bih.biClrUsed=0; mocR_3=Q?
bih.biCompression=0; CjtBQ5
bih.biHeight=btm.bmHeight; <1")JDW
bih.biPlanes=1; tA#7Xr+
bih.biSize=sizeof(BITMAPINFOHEADER); 5f5bhBZ<
bih.biSizeImage=size; ,/{(8hn
bih.biWidth=btm.bmWidth; )qXl8H I
bih.biXPelsPerMeter=0; ) 0p9I0=
bih.biYPelsPerMeter=0; h SGI
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ]O%wZIp\P
static int filecount=0; E=N44[`.G
CString name; c6 O1Z\M@\
name.Format("pict%04d.bmp",filecount++); kmfz=q?
name=m_Path+name; J<K-Yeph
BITMAPFILEHEADER bfh; <{$0mUn;s|
bfh.bfReserved1=bfh.bfReserved2=0; P#e1?
bfh.bfType=((WORD)('M'<< 8)|'B'); M#<U=Ha
bfh.bfSize=54+size; <'s_3AC
bfh.bfOffBits=54; 8?p40x$m%
CFile bf; "S8JHHx
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ,-!h
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); y b 7
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &.dC%
bf.WriteHuge(lpData,size); y3!r;>2k=
bf.Close(); Fk&W*<}/;
nCount++; 5Q_T=TL
} QGv$ ~A[h
GlobalFreePtr(lpData); j?!BHNs
if(nCount==1) ~Sq!P
m_Number.Format("%d picture captured.",nCount); :{#%_^}k
else \}CQo0v
m_Number.Format("%d pictures captured.",nCount); |%wgux`z
UpdateData(FALSE); lqD.epm
}
t9zPUR
f~U~f}Uw4
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) AH*{Bi[vX
{ l,z#
:k
if(pMsg -> message == WM_KEYDOWN) Xz/5Wis4
{ z^@.b
if(pMsg -> wParam == VK_ESCAPE) IZr~h9
return TRUE; [V vTR#^
if(pMsg -> wParam == VK_RETURN) 7d9kr?3(U
return TRUE; &G#LQl
} 3Z,J&d`[
return CDialog::PreTranslateMessage(pMsg); +TA'P$j
} \BIa:}9O
aQ@9(j>
F
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l/=2P_8+Z
{ x2-i1#j`;
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G8]DK3#
SaveBmp(); j$2rU'
return FALSE; cJ CKxj
} `2}Frw+?
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ fW/G_
CMenu pop; ixK&E#
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); XUI9)Ne
CMenu*pMenu=pop.GetSubMenu(0); y r4j
pMenu->SetDefaultItem(ID_EXITICON); g43j-[j)
CPoint pt; ,tt
.oF|
GetCursorPos(&pt); 87QK&S\
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 7'c ;$~
if(id==ID_EXITICON) +I>u${sVx*
DeleteIcon(); uc.dtq!
else if(id==ID_EXIT) j`fQN
OnCancel(); cr}T ? $\K
return FALSE; J[Ckz]
} 'VgdQp$L$
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &E{CQ#k
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) H2f!c{t$p
AddIcon(); =[N=mC
return res; x,CTB
} 79DzrLu
S5Hb9m&&
void CCaptureDlg::AddIcon() }rWEa^
{ =H<I` J'
NOTIFYICONDATA data; |E%i
t?3M
data.cbSize=sizeof(NOTIFYICONDATA); ~0;l\^
CString tip; Yf=an`"
tip.LoadString(IDS_ICONTIP); 4trP*u,4
data.hIcon=GetIcon(0); Ry$zF~[
data.hWnd=GetSafeHwnd(); we4k VAn
strcpy(data.szTip,tip); !ucHLo3:
data.uCallbackMessage=IDM_SHELL; `"7}'|
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; LB(I^
data.uID=98; \&{a/e2:S
Shell_NotifyIcon(NIM_ADD,&data); M2pe*z
ShowWindow(SW_HIDE); >9WJa 5{
bTray=TRUE; UN
FQ`L
} Q9i&]V[`
qocN:Of1
void CCaptureDlg::DeleteIcon() E{Kc$,y
{ L|?$F*bs
NOTIFYICONDATA data; I_/E0qSJI
data.cbSize=sizeof(NOTIFYICONDATA); Yk;-]qi7
data.hWnd=GetSafeHwnd(); jOkc'
data.uID=98; ,A$#gLyk<
Shell_NotifyIcon(NIM_DELETE,&data); J?oI%r7^
ShowWindow(SW_SHOW); w5C$39e\G
SetForegroundWindow(); m;_gNh8 Ee
ShowWindow(SW_SHOWNORMAL); \
oY/hT _
bTray=FALSE; ~wtK(U
} cEdf&*_-'I
wZ(H[be
void CCaptureDlg::OnChange() (G>S`B
{ s6U$]9 `
RegisterHotkey(); lQ8h -Tz
} h_( #U)z_3
/?ZO-]q
BOOL CCaptureDlg::RegisterHotkey() B4D#TlB
{ Oc6_x46S4
UpdateData(); YaBZ#$r
UCHAR mask=0; EJCf[#Sf
UCHAR key=0; Kl'u
if(m_bControl) 65HP9`5Tm
mask|=4; Z!/!4(Fh
if(m_bAlt) Q!91uNL
mask|=2; J1s~w`,
if(m_bShift) EbfE/_I
mask|=1; 1*aO2dOq
key=Key_Table[m_Key.GetCurSel()]; B~CdY}UTsj
if(bRegistered){ & t.G4
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5[[mS
bRegistered=FALSE; ]ZMFK>"^%
} RXi/&'+H
cMask=mask; )Ja&Y
cKey=key; /e:kBjysJ
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); PM?F;mj
return bRegistered; o]@Mg5(8Q
} Q)IL]S
I[l8@!0
四、小结 f} !Eu
X([8TR
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。