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:
%m-U:H.Vp
T _fM\jdI 一、实现方法
+.QJZo_ _[/#t|I} 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:
!gJw?(8" <4582x,G #pragma data_seg("shareddata")
m%s:4Z%= HHOOK hHook =NULL; //钩子句柄
0x fF UINT nHookCount =0; //挂接的程序数目
7\yh<?`V8 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
k +Cwnp static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
]#vi/6\J static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
sEi9<$~R@0 static int KeyCount =0;
Yw_!40` static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
ZWQ/BgKB #pragma data_seg()
Hz>Dp
! l_Zx'm 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
^ U~QQ 8k;il54# DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
#gXxBM T@a|*.V BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
R$;TX^r'o& cKey,UCHAR cMask)
i:1
@ vo {
zpZfsn! BOOL bAdded=FALSE;
\} _,g for(int index=0;index<MAX_KEY;index++){
J|`.d46 if(hCallWnd[index]==0){
w8a49 Fv hCallWnd[index]=hWnd;
\J;_%-Z HotKey[index]=cKey;
;RYIc0% HotKeyMask[index]=cMask;
DKF
'* bAdded=TRUE;
IL`=r6\ KeyCount++;
6w[EJ;=p_ break;
wOsg,p;\' }
W:K '2j }
PlCj<b1D: return bAdded;
gyuBmY }
jwP5pu //删除热键
3cF8DNh BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
w/*m_O\! {
5GGO: BOOL bRemoved=FALSE;
nkf7Fq} for(int index=0;index<MAX_KEY;index++){
2+ywl}9 if(hCallWnd[index]==hWnd){
?hViOh$. if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
[v`kqL~ hCallWnd[index]=NULL;
:aH5=@[!y HotKey[index]=0;
gFsqCx<q HotKeyMask[index]=0;
8e1Z:axn0 bRemoved=TRUE;
x_r*<?OZ KeyCount--;
hw(\3h() break;
lnRL^ } }
-!}3bl*(7 }
Fu5c_"! }
,e$6%R return bRemoved;
l>KkAA }
lc3Gu78 A/ $tej~xZK %r8;i DLL中的钩子函数如下:
r-.>3J YrV@k*O* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
:>U+HQll {
E;[Uhh|78! BOOL bProcessed=FALSE;
GP^.h kVs if(HC_ACTION==nCode)
I&31jn_o
/ {
# 1dg% if((lParam&0xc0000000)==0xc0000000){// 有键松开
;#:AM; switch(wParam)
-&=dl_m {
X0R EC% case VK_MENU:
3#Bb4\_v MaskBits&=~ALTBIT;
-:E~Z_J` break;
vrcIwCa case VK_CONTROL:
*"OUwEl a MaskBits&=~CTRLBIT;
5DVYHN9c| break;
V@[C=K case VK_SHIFT:
{Wu[e,p MaskBits&=~SHIFTBIT;
]qxl^Himq break;
Dp!91NgB p default: //judge the key and send message
2t
PfIg break;
{Ay dt8 }
"%p7ft for(int index=0;index<MAX_KEY;index++){
T^(> 8/O if(hCallWnd[index]==NULL)
e[s}tjx continue;
P-3f51 Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}
!y5hv!_ {
|Wjpnz SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
cnI5G! bProcessed=TRUE;
Wky9wr:g }
-$DfnAh }
2`TV(U@ }
c+
e~BN else if((lParam&0xc000ffff)==1){ //有键按下
Ka_;~LS>( switch(wParam)
Fk^N7EJ:$ {
/KNDo^P case VK_MENU:
;S '?l0 MaskBits|=ALTBIT;
om2N*W.gk break;
dvU{U@:sz case VK_CONTROL:
bzxf*b1I MaskBits|=CTRLBIT;
1m#.f=u{R break;
P%gA`j case VK_SHIFT:
^'a#FbMtt MaskBits|=SHIFTBIT;
CS~_>bn break;
~$J(it-a default: //judge the key and send message
ts9wSx~[+ break;
a[ayr$Hk? }
Ikw@B)0} for(int index=0;index<MAX_KEY;index++){
t%%()!|)j if(hCallWnd[index]==NULL)
S_/S2(V" continue;
7eAV2. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
se`Eez} {
sRA2O/yKCE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
U3Z=X TB bProcessed=TRUE;
N9-7YQ`D }
m|F1_Ggz }
G}9f/$'3 }
c!/+0[ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
%1.F;-GdsW for(int index=0;index<MAX_KEY;index++){
/s}
"0/Y\ if(hCallWnd[index]==NULL)
f&mi nBU continue;
1P*hC< if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
kDMvTVd SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
S#?2E8 //lParam的意义可看MSDN中WM_KEYDOWN部分
XUA@f* }
7HBf^N. }
zh*D2/r }
FK593z return CallNextHookEx( hHook, nCode, wParam, lParam );
5a$EXV }
[`t ;or V`1{*PrI@L 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:
U/^#nU., 7XK0vKmW3 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
8hD[z} BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Cj<8r S4+ tP7<WGHd/ 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:
t15{>>f4> 4P k%+l LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
XFvl {
t`+A;%=K] if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
6UuN-7z!" {
t4[q:[1 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
HyVV,q^E SaveBmp();
]JYE#F return FALSE;
,>h"~X }
BZ1wE1 t …… //其它处理及默认处理
Y~85Z0l }
nOvR, 6 _ERtL5^ T+ZA"i+
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。
$3G^}A" O5 73AA 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
3Iv^ K F_fz 二、编程步骤
Y?NL|cW4 9hfg/3t(' 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
=g9n =spAn WSu6chz) 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
5@m
,*n&[ ]690ey$E:j 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;
jez0 A H.ksI;, 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;
,3Q~X$f w;`Jj- 5、 添加代码,编译运行程序。
6dR+qJa6i >5Yn`Fc5 三、程序代码
k`8O/J t4_yp_ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
<@KIDZYC #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
<&l$xn #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
~p?ArZb #if _MSC_VER > 1000
XNWtX-[^@ #pragma once
gZ$
8Y7 #endif // _MSC_VER > 1000
~3?-l/ $ #ifndef __AFXWIN_H__
5 ix*wu`, #error include 'stdafx.h' before including this file for PCH
!q\=e@j-i #endif
f?Zjd&|Ch #include "resource.h" // main symbols
p{^:b6 class CHookApp : public CWinApp
.iRKuBM/ {
+ig%_QED[\ public:
$qQYxx@ CHookApp();
]O"f % // Overrides
'NhQBk // ClassWizard generated virtual function overrides
E=ijt3 //{{AFX_VIRTUAL(CHookApp)
|6JKB' public:
6+IhI?lI= virtual BOOL InitInstance();
_w4G|j$C virtual int ExitInstance();
P);s0Y|@H //}}AFX_VIRTUAL
?f"5yQ-B //{{AFX_MSG(CHookApp)
i *.Y // NOTE - the ClassWizard will add and remove member functions here.
>,{sFc // DO NOT EDIT what you see in these blocks of generated code !
g2|Myz) //}}AFX_MSG
<J&S[`U! DECLARE_MESSAGE_MAP()
5p[}<I{ };
QPDh!A3T LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
"kyCY9)% BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
wS*r<zj BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
#XDgvX > BOOL InitHotkey();
q>2bkc GY# BOOL UnInit();
Z)`)9]* #endif
o{sv<$ noxJr/A] //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
eut2x7Z(c #include "stdafx.h"
o:AfEoH"~ #include "hook.h"
%;k Hnl #include <windowsx.h>
VO|ECB2e #ifdef _DEBUG
w+R/>a(] #define new DEBUG_NEW
qg
oB}n% #undef THIS_FILE
~V8z%s@ static char THIS_FILE[] = __FILE__;
u[b |QR=5 #endif
sE% $]Jp #define MAX_KEY 100
H`CID*Ji #define CTRLBIT 0x04
V%oZT>T3 #define ALTBIT 0x02
(SBhU:^h #define SHIFTBIT 0x01
90<g=B #pragma data_seg("shareddata")
{-\U)&6#v HHOOK hHook =NULL;
)R JEOl1 UINT nHookCount =0;
q*&R&K;q static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
t>\sP static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
a_>|Ny6{ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
=b%}x >> static int KeyCount =0;
^?VQ$o2 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
<=*f #pragma data_seg()
*U[yeE]. HINSTANCE hins;
@Dh2@2`> void VerifyWindow();
'>"{yi- BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
/sA&}kX}E //{{AFX_MSG_MAP(CHookApp)
b5NVQ8Mq // NOTE - the ClassWizard will add and remove mapping macros here.
8F}drK9>F // DO NOT EDIT what you see in these blocks of generated code!
'I]XX==_ //}}AFX_MSG_MAP
)!"fUz$ END_MESSAGE_MAP()
+-!E%$ m\`>N_4*9 CHookApp::CHookApp()
f jx`|MJ {
nqyD>> // TODO: add construction code here,
,dIev< // Place all significant initialization in InitInstance
xqG<R5k>> }
bE _8NA"2 j]BRf A CHookApp theApp;
8>v_th LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
7Z6=e6/\ {
,|]JaZq BOOL bProcessed=FALSE;
nq M7Is if(HC_ACTION==nCode)
p~$cwbQ! {
u.GnXuax if((lParam&0xc0000000)==0xc0000000){// Key up
1r;zA<<%R switch(wParam)
?_NKyiu95 {
"h sT^sy case VK_MENU:
bF"l0
jS MaskBits&=~ALTBIT;
``-N2U5 break;
v-1}&K case VK_CONTROL:
R=z]) MaskBits&=~CTRLBIT;
9ddrtJ] break;
XnyN*}8 case VK_SHIFT:
QKG3>lU MaskBits&=~SHIFTBIT;
')"+ a^c break;
CvoFt=c$jE default: //judge the key and send message
&W2*'$j"_ break;
3z8i0 }
IO\4dU) for(int index=0;index<MAX_KEY;index++){
o:Fq|?/e if(hCallWnd[index]==NULL)
FnO@\{M"A continue;
UkL1h7}a\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
f<YYo {
Q\$3l'W SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
%2\Hj0JQQ bProcessed=TRUE;
<3;p>4gN }
#a8kA"X }
.IeO+RDQ }
cM#rus?)+ else if((lParam&0xc000ffff)==1){ //Key down
2e`}O switch(wParam)
IVR%H_uz {
23}` e case VK_MENU:
9kL,69d2 MaskBits|=ALTBIT;
bv+u7B6, break;
k#].nQG
case VK_CONTROL:
QZzamT)" MaskBits|=CTRLBIT;
[l23b{ break;
q(KjhM case VK_SHIFT:
0fsVbC MaskBits|=SHIFTBIT;
-vvyG break;
@-$8)?`q default: //judge the key and send message
#<*Vc6pC break;
AC,RS7 }
$^]K611w9 for(int index=0;index<MAX_KEY;index++)
=Hi@q
" {
GcBqe=/B! if(hCallWnd[index]==NULL)
Yuvi{ 0 continue;
;l$$!PJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
GK@OdurAR {
Su#0F0 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
!}&|a~U@`k bProcessed=TRUE;
%*
"+kwZ }
>i/jqT/ }
q/i2o[f'n }
b($hp%+yJ if(!bProcessed){
-#v~;Ci for(int index=0;index<MAX_KEY;index++){
Vb0T)C if(hCallWnd[index]==NULL)
zxyl+tU & continue;
:`bC3Mr if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
XM$~HG SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
gmGK3am }
x?h/e; }
]VI^ hhf }
ATs_d_Sz return CallNextHookEx( hHook, nCode, wParam, lParam );
K`4lL5oH }
lTx_E#^s ^m>4<~/ BOOL InitHotkey()
^6s im 2 {
{EgSjxfmw if(hHook!=NULL){
U+S=MP
}: nHookCount++;
cAWn*% return TRUE;
=xI;D,@S }
(@?mm else
Rlq7.2cP hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
oTw!#Re) if(hHook!=NULL)
F? #3 nHookCount++;
DHO]RRGV return (hHook!=NULL);
mQ[$U }
<FT7QO$I BOOL UnInit()
,B <\a {
(5yM%H8: if(nHookCount>1){
:/5m
D nHookCount--;
;+Jx,{) return TRUE;
?
wS}' }
GP}; ~ BOOL unhooked = UnhookWindowsHookEx(hHook);
c./\sN@ if(unhooked==TRUE){
)x.%PUA nHookCount=0;
iU)I"#\l'k hHook=NULL;
t~Q9}+ }
r.C6`
a return unhooked;
+3v)@18B1 }
Rh="<'d e5L+NPeM6v BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
NRRJlY
S {
_7c3=f83 BOOL bAdded=FALSE;
'.A!IGsj for(int index=0;index<MAX_KEY;index++){
8`4M4"lj if(hCallWnd[index]==0){
PxkV[nbS hCallWnd[index]=hWnd;
JF=R$! 5 HotKey[index]=cKey;
[|]J8o@u^ HotKeyMask[index]=cMask;
{[y6qQm bAdded=TRUE;
$WA wMS, KeyCount++;
IiYL2JS;t| break;
xR+vu>f }
N`8K1{>BH }
]2AOW}= return bAdded;
@Z5q2Q }
k/K)nH@) s QDgNJbU BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
'HA{6v,y {
#6 M]tr BOOL bRemoved=FALSE;
5y#,z`S for(int index=0;index<MAX_KEY;index++){
8v$q+Wic if(hCallWnd[index]==hWnd){
E0Wc8m " if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
T.bFB+'E| hCallWnd[index]=NULL;
J
En jc/ HotKey[index]=0;
%cF`x_h[j HotKeyMask[index]=0;
.D*Qu} bRemoved=TRUE;
P\U<,f KeyCount--;
qt8Y3:=8l break;
*!5CL' }
MAa9JA8kw) }
u~uzKG }
DB vM.'b$ return bRemoved;
Q):#6|u+ }
|x}TpM;ni 1XGg0SC void VerifyWindow()
Cfi{%,em {
Jh"[ug for(int i=0;i<MAX_KEY;i++){
oo'9ZE/% if(hCallWnd
!=NULL){ =
0 ~4k#
if(!IsWindow(hCallWnd)){ )nN!% |J
hCallWnd=NULL; GS;GJsAs
HotKey=0; 1/dL-"*0
HotKeyMask=0; ^y5A\nz&
KeyCount--; [$y(>]~.
} L%/RD2LD
} L8 P0bNi
} LuS@Kf8N+
} bZowc {!\
H<Snp)
BOOL CHookApp::InitInstance() SmXoNiM"y
{ F`D$bE;|
AFX_MANAGE_STATE(AfxGetStaticModuleState()); h:Pfiw]
hins=AfxGetInstanceHandle(); N/a4Gl(
InitHotkey(); *C*J1JYp+
return CWinApp::InitInstance(); DB}Uzw|
} 6-U_TV
} z'Jsy[s
int CHookApp::ExitInstance() De$~ *2
{ bT:u|/I
VerifyWindow(); z{XB_j6\=
UnInit(); >X~B1D,SV7
return CWinApp::ExitInstance();
*yZ6"
} Ww<Y]H$xZ<
Ah2@sp,z
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `YOYC
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 5%-{r&
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ }7.A~h
#if _MSC_VER > 1000 `d <`>
#pragma once Q{/z>-X\x
#endif // _MSC_VER > 1000 t=%zY~P
j0l{Mc5
class CCaptureDlg : public CDialog J6 ~Sr
{ tU4#7b:Y
// Construction aCZ0-X?c
public: "P !
.5B
BOOL bTray; ,%pCcM)
BOOL bRegistered; [@i:qB>B
BOOL RegisterHotkey(); >.<VD7p
UCHAR cKey; 6[m~xegG
UCHAR cMask; H/a gt
void DeleteIcon(); eMGJx "a
void AddIcon(); CHnclT
UINT nCount; K V5
'-Sv1
void SaveBmp(); W8W7<ml0A
CCaptureDlg(CWnd* pParent = NULL); // standard constructor
>a"J);p
// Dialog Data ()lgd7|+
//{{AFX_DATA(CCaptureDlg) XIcUoKg^
enum { IDD = IDD_CAPTURE_DIALOG }; ^".OMS"!
CComboBox m_Key; m?S;sew@5
BOOL m_bControl; '#Wx@
BOOL m_bAlt; V]zZb-m=
BOOL m_bShift; XYU5.
CString m_Path; OZ`cE5"i
CString m_Number; E%w^q9C
//}}AFX_DATA k_pv6YrE
// ClassWizard generated virtual function overrides poz_=,c
//{{AFX_VIRTUAL(CCaptureDlg) <H-Nft>O
public: kpgvAKyx
virtual BOOL PreTranslateMessage(MSG* pMsg); _S9)<RVI+
protected: 3lF"nv
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (cj9xROx
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6Zi{gx
//}}AFX_VIRTUAL I%d=c0>%
// Implementation -y.cy'$f
protected: >LBA0ynh
{
HICON m_hIcon; e-dkvPr
// Generated message map functions S,5ok0R
//{{AFX_MSG(CCaptureDlg) t$BjJ -G
virtual BOOL OnInitDialog(); x?AG*'
h&
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); yY VR]H H
afx_msg void OnPaint(); p]aEC+q
afx_msg HCURSOR OnQueryDragIcon(); .fWy\r0
virtual void OnCancel(); f:-)S8OJ
afx_msg void OnAbout(); sH6;__e
afx_msg void OnBrowse(); (.-4Jn
afx_msg void OnChange(); -XYvjW,|
//}}AFX_MSG O84]J:b
DECLARE_MESSAGE_MAP() hQ#e;1uD
}; l>6tEOXt
#endif $>)0t@[f
7.
F'1oEf
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [CQR
#include "stdafx.h" n>ryS/1
#include "Capture.h" '/O:@P5qY
#include "CaptureDlg.h" MCN>3/81
#include <windowsx.h> ']k<'`b|
#pragma comment(lib,"hook.lib") FJvY`zqB
#ifdef _DEBUG HXq']+iC
#define new DEBUG_NEW %+*=Vr
#undef THIS_FILE VR(R.
static char THIS_FILE[] = __FILE__; |4\1V=(
#endif [t4v/vQT
#define IDM_SHELL WM_USER+1 ny-:%A
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t:10
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KZKE&bTx
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :T-DxP/
class CAboutDlg : public CDialog +bumWOQ'
{ g Wtc3
public: '| i?-(f)
CAboutDlg(); 0B.Gt&Oal
// Dialog Data uj.i(Us
//{{AFX_DATA(CAboutDlg) FL{Uz+Q
enum { IDD = IDD_ABOUTBOX }; /A{ Zf'DI
//}}AFX_DATA ]N'3jf`W
// ClassWizard generated virtual function overrides UhH#>2r_
//{{AFX_VIRTUAL(CAboutDlg)
{/QVs?d
protected: %IsodtkDu
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D:T]$<=9
//}}AFX_VIRTUAL i{^T;uAE
// Implementation wOAR NrPx2
protected: o/N!l]r
//{{AFX_MSG(CAboutDlg) H )ej]DXy
//}}AFX_MSG ACyK#5E
DECLARE_MESSAGE_MAP() Mj@2=c
}; j[U#J
&g|[/~dIr
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -[=~!Qr:
{ $a_y-lY
//{{AFX_DATA_INIT(CAboutDlg) 3;>ls~4
//}}AFX_DATA_INIT d]DV\*v
} |5 V0_79
y[m,t}gi
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ` aVp#
{ d{YvdN9d
CDialog::DoDataExchange(pDX); A.>mk598
//{{AFX_DATA_MAP(CAboutDlg) 'rB%a<
//}}AFX_DATA_MAP ]oP1c-GEk
} !|[rh,e]
;1(^H:7T
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) GD4S/fn3
//{{AFX_MSG_MAP(CAboutDlg) NW1 Jr/
// No message handlers #RlZxtx.O
//}}AFX_MSG_MAP Q^b&
END_MESSAGE_MAP() T.da!!'B
f
wv9HiHz8gD
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !v}TRGX
: CDialog(CCaptureDlg::IDD, pParent) 8^>qor.]M
{ aqON6|6K
//{{AFX_DATA_INIT(CCaptureDlg) ) H,Xkex
m_bControl = FALSE; = wz}yfdrC
m_bAlt = FALSE; }zGx0Q
m_bShift = FALSE; |.k'?!
m_Path = _T("c:\\"); g* YDgY
m_Number = _T("0 picture captured."); J5{;+ysUMl
nCount=0; ?c#s}IH
bRegistered=FALSE; -Q20af-
bTray=FALSE; 1'&.6{)P
//}}AFX_DATA_INIT Z|t=t"6"
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 JI>Y?1i0O
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $cSUB
} }a;xs};X;
R1zt6oY
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #Y=^4 U`
{ gH//@`6
CDialog::DoDataExchange(pDX); neFwxS?
//{{AFX_DATA_MAP(CCaptureDlg) oxxuw
Dcl
DDX_Control(pDX, IDC_KEY, m_Key); bv4umL /
DDX_Check(pDX, IDC_CONTROL, m_bControl); ^L%_kL_7
DDX_Check(pDX, IDC_ALT, m_bAlt); t\,Y<9{w
DDX_Check(pDX, IDC_SHIFT, m_bShift); pwFdfp
DDX_Text(pDX, IDC_PATH, m_Path); c{=;lT
DDX_Text(pDX, IDC_NUMBER, m_Number); -`faXFW'
//}}AFX_DATA_MAP 9L>?N:%5
} mi=mwN%UB
NzT
&K7v
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9tHK_),9
//{{AFX_MSG_MAP(CCaptureDlg) ^`cv6;)
ON_WM_SYSCOMMAND() EJn]C=_(
ON_WM_PAINT() AQ)gj$
m3
ON_WM_QUERYDRAGICON() 6=f)3!=
ON_BN_CLICKED(ID_ABOUT, OnAbout) =+iY<~8
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) qPPe)IM'Sc
ON_BN_CLICKED(ID_CHANGE, OnChange) d6MWgg
//}}AFX_MSG_MAP q;68tEupR
END_MESSAGE_MAP() B<d=;V
%5e|
BOOL CCaptureDlg::OnInitDialog() Bt<)1_
{ VlV
X
CDialog::OnInitDialog(); JVoC2Z<
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); M+%Xq0`T
ASSERT(IDM_ABOUTBOX < 0xF000); d]0:r]e
CMenu* pSysMenu = GetSystemMenu(FALSE); &qbEF3p^@
if (pSysMenu != NULL) _*AI1/>`
{ *'?ZG/ (
CString strAboutMenu; 'J?{/O ^
strAboutMenu.LoadString(IDS_ABOUTBOX); =F@
+~)_
if (!strAboutMenu.IsEmpty()) >` s"C
{ pB:XNkxL
pSysMenu->AppendMenu(MF_SEPARATOR); "WKOlfPa
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v]cw})l
} j-9)Sijj{
} 9 :2Bt <q
SetIcon(m_hIcon, TRUE); // Set big icon K+~?yOQj
SetIcon(m_hIcon, FALSE); // Set small icon H q6%$!q
m_Key.SetCurSel(0); v-#,@&Uwq
RegisterHotkey(); /bykIUTKI
CMenu* pMenu=GetSystemMenu(FALSE); `"=Hk@E
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); X(tx8~z
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 0BXr[%{`
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Z#}sK5s
return TRUE; // return TRUE unless you set the focus to a control |Z>-<]p9g
} li[[AAWVm
yhKH}
kR
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .'`aX
7{\
{ _WNbuk0
if ((nID & 0xFFF0) == IDM_ABOUTBOX) fd4gB6>
{ {H/%2
CAboutDlg dlgAbout; ~Z5AIm R|
dlgAbout.DoModal(); i@9
qp?eb
} K^!#;,0
else O[ z0+Q?6Z
{ bkdXBCBx?
CDialog::OnSysCommand(nID, lParam); ~B[e*|d
} <Z.`X7]Uk
} Sqi9'-%m
p
l^;'|=M
void CCaptureDlg::OnPaint() n>)aw4
{ lZAGoR;0Ra
if (IsIconic()) r]Hrz'C`
{ [.>=>KJ_
CPaintDC dc(this); // device context for painting 80Y%C-Y:
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -G>J
// Center icon in client rectangle hwM<0Jf
int cxIcon = GetSystemMetrics(SM_CXICON); 3PkZXeH/
int cyIcon = GetSystemMetrics(SM_CYICON); rd&d~R6
CRect rect; b#@xg L*D
GetClientRect(&rect); bYLYJ`hH<R
int x = (rect.Width() - cxIcon + 1) / 2; v9H
t~\>
int y = (rect.Height() - cyIcon + 1) / 2; Hx6ODj[-
// Draw the icon I'IFBVhaYn
dc.DrawIcon(x, y, m_hIcon); O^\:J2I(
} J,,VKA&
else FV9{u[3m
{ Mo@{1K/9
CDialog::OnPaint(); T%.Yso{
} SOG(&)b
} egs P\ '
1$DcE>
HCURSOR CCaptureDlg::OnQueryDragIcon() 8/p ]'BLf
{ >&HW6 c
return (HCURSOR) m_hIcon; l'm|**
} `=;}I@]zj)
f~l pa7
void CCaptureDlg::OnCancel() xppnBnu$7
{ Z?S?O#FED
if(bTray) %H?B5y
DeleteIcon(); ~I N g9|
CDialog::OnCancel(); ;m]
n l_vg
} Wj3i*x$
*b~8`Opa`
void CCaptureDlg::OnAbout() M5RN Z%
{ *# <%04f
CAboutDlg dlg; m^BXLG:b
dlg.DoModal(); w)J-e gc
} R-$w*=Y
B{0]v-w
void CCaptureDlg::OnBrowse() P_jav0j7g
{ s8A"x`5(
CString str; \aPH_sf,
BROWSEINFO bi; WyV,(~y
char name[MAX_PATH]; X)(K|[
ZeroMemory(&bi,sizeof(BROWSEINFO)); y)LX?d
bi.hwndOwner=GetSafeHwnd(); 3W ]zLUn
bi.pszDisplayName=name; uN?Lz1W\;
bi.lpszTitle="Select folder"; @rqmDpU
bi.ulFlags=BIF_RETURNONLYFSDIRS; #Qg)4[pMJ
LPITEMIDLIST idl=SHBrowseForFolder(&bi); U5ph4G
if(idl==NULL) VQf^ y q
return; C:&Sk\
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); q%k&O9C2]
str.ReleaseBuffer(); <x$nw'H9
m_Path=str; XU<owk
if(str.GetAt(str.GetLength()-1)!='\\') h('5x,G%
m_Path+="\\"; !m=Js"
UpdateData(FALSE); GYy8kp84
} 3,Z;J5VL4!
)y:M8((%
void CCaptureDlg::SaveBmp() C3.]dsv:
{ :xmj42w>^
CDC dc; oGZuYpa9
dc.CreateDC("DISPLAY",NULL,NULL,NULL); >mCH!ey
CBitmap bm; '% _K"rb
int Width=GetSystemMetrics(SM_CXSCREEN); `"'u
mIz
int Height=GetSystemMetrics(SM_CYSCREEN); QgH{J80
bm.CreateCompatibleBitmap(&dc,Width,Height); vp&.
CDC tdc; 5KbPpKpd
tdc.CreateCompatibleDC(&dc); i\Yd_
CBitmap*pOld=tdc.SelectObject(&bm); %q r,Ssa/
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5mVO9Qj
tdc.SelectObject(pOld); jB9~'>JY
BITMAP btm; r25VcY
bm.GetBitmap(&btm); l'Li!u
DWORD size=btm.bmWidthBytes*btm.bmHeight; Tw%1m
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); N DI4EA~z
BITMAPINFOHEADER bih; ,d!@5d&Zi
bih.biBitCount=btm.bmBitsPixel; #v$wjqK5
bih.biClrImportant=0; ORqqzy +
bih.biClrUsed=0; < j
bih.biCompression=0; v 9G~i
bih.biHeight=btm.bmHeight; *E>R1bJ8
bih.biPlanes=1; JSq3)o9?/
bih.biSize=sizeof(BITMAPINFOHEADER); EAr;
bih.biSizeImage=size; .`u8(S+
bih.biWidth=btm.bmWidth; sm?b,T/
bih.biXPelsPerMeter=0; '8R5Tl
bih.biYPelsPerMeter=0; &&jQ4@m}j
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9%R"(X)
static int filecount=0; KDf#e3
CString name; 2u0B=0x
name.Format("pict%04d.bmp",filecount++); ',|OoxhbK
name=m_Path+name; u46Z}~xf b
BITMAPFILEHEADER bfh; xz}CqPJ#
bfh.bfReserved1=bfh.bfReserved2=0; m'G=WO*%
bfh.bfType=((WORD)('M'<< 8)|'B'); )_Hv9!U]e
bfh.bfSize=54+size; d@8:f
bfh.bfOffBits=54; R:'&>.AUw
CFile bf; xHx_!
)7
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ wmMn1q0F
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2cS94h
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,T^A?t
bf.WriteHuge(lpData,size); yI!W658$6
bf.Close(); z 36Y/{>[
nCount++; p_zVrlVb
} iB~dO @
GlobalFreePtr(lpData); Zu~t )W
if(nCount==1) (Xzq(QV
m_Number.Format("%d picture captured.",nCount); Q?>*h xzoP
else P uQ
m_Number.Format("%d pictures captured.",nCount); -IDhK}C&T
UpdateData(FALSE); K0@bh/i/^
}
A;^{%S
YOfYa
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &P*r66
{ juu"V]Q1
if(pMsg -> message == WM_KEYDOWN) 1xsJz^%V
{ fI.X5c>WK
if(pMsg -> wParam == VK_ESCAPE) PVN`k, 4
return TRUE; 3+C;zDKa
if(pMsg -> wParam == VK_RETURN) Mx3f T>?
return TRUE; W=#jtU`:5
} 'Vhnio;qC
return CDialog::PreTranslateMessage(pMsg); Xp6Z<Z&N
} b
ts*qx&)
hsK(09:J
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D-m%eP.
{ 6@d/k.3p
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >Fe=PRs
SaveBmp(); dJb7d`
return FALSE; ,[_)BM
} daf-B-
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 6hFs{P7
CMenu pop; OaByfo<S
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,yfJjV*I
CMenu*pMenu=pop.GetSubMenu(0); xKT;1(Mk
pMenu->SetDefaultItem(ID_EXITICON); #TgP:t]p
CPoint pt; G+3uY25y
GetCursorPos(&pt); COH.`Tv{*
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y7z ,I
if(id==ID_EXITICON) 0zjGL7
DeleteIcon(); V%^d~^m,H
else if(id==ID_EXIT) ])zpx-
OnCancel(); 4LJOT_
return FALSE; C+C1(b;1
} ?J"Y4,{
LRESULT res= CDialog::WindowProc(message, wParam, lParam); v1NFz>Hx
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (<|1/^~=
AddIcon(); En8L1$_
return res; hg `N`O
} c,*a|@
{Q0DHNP(G
void CCaptureDlg::AddIcon() J =#9eW
{ ;s-fYS6(>{
NOTIFYICONDATA data; <@v|~AO4~
data.cbSize=sizeof(NOTIFYICONDATA); oIKuo~
CString tip; ]mi)x63^
tip.LoadString(IDS_ICONTIP); M
!rw!,g
data.hIcon=GetIcon(0); A+hT2Ew@t}
data.hWnd=GetSafeHwnd(); fp"GdkO#}i
strcpy(data.szTip,tip); `u8=~]rblj
data.uCallbackMessage=IDM_SHELL; b$B-LvHd1
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^Ov+n1,)
data.uID=98; <)gTi759h)
Shell_NotifyIcon(NIM_ADD,&data); e/IVZmUn^
ShowWindow(SW_HIDE); Uetna!ABB
bTray=TRUE; 9sB LCZ
} R)GDsgXy
`$r?^|T
void CCaptureDlg::DeleteIcon() M3q7{w*bM
{ v/G^yZa
NOTIFYICONDATA data; `Jl_'P}
data.cbSize=sizeof(NOTIFYICONDATA); YZ5[# E@l
data.hWnd=GetSafeHwnd(); I8:G:s:
data.uID=98; 3T@`VFbE
Shell_NotifyIcon(NIM_DELETE,&data); 2!Pwg0%2
ShowWindow(SW_SHOW); rK
cr1VFy
SetForegroundWindow(); /_/Z/D!
ShowWindow(SW_SHOWNORMAL); ' ]vMOGG
bTray=FALSE; _dn*H-5hO
} -k@Uo(MB
z~yLc{M
void CCaptureDlg::OnChange() r Ww.(l
{ %A;s3]V
RegisterHotkey(); ltmD=-]G_
} 9B1bq #
?}U l(
BOOL CCaptureDlg::RegisterHotkey() .+ CMm5T
{ (
z%t
UpdateData(); 7e@Bkq0)
UCHAR mask=0; 6)#%36rP
UCHAR key=0; v!rOT/I
if(m_bControl) PAy7b7m~B
mask|=4; (:J
U
if(m_bAlt) G)y'ex k
mask|=2; 4 !M6RL8{
if(m_bShift) F}_Zh9/$(
mask|=1; 8HH\wu$$e
key=Key_Table[m_Key.GetCurSel()]; _jrkR
n1 "
if(bRegistered){ I6F $@
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Gjf1Ba
bRegistered=FALSE; %{";RfSVX%
} Y t0s
cMask=mask; ;i;;{j@$i
cKey=key; |#(g8ua7
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); L~L]MC&
return bRegistered; M%FKg/
} m}fY5r<<;/
F5f1j]c
四、小结 AV["%$:
7:h_U9Za?$
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。