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:
y![h
594$X@!v 一、实现方法
m`n51i{U !5x"d7 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
F
YcC2TM CKj3-rcF( #pragma data_seg("shareddata")
|`#[jHd HHOOK hHook =NULL; //钩子句柄
Ie` `Wb= UINT nHookCount =0; //挂接的程序数目
(Iu5QLE static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
=$fxK static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
O>H4hp static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
K&Zdk (l) static int KeyCount =0;
mh|M O( static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
H,] D}r #pragma data_seg()
z^~fVl Zuwd(q
关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
BC&Et62* =w,%W^"E 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:
^1}}-9q hX_;gR&R BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
>C@fSmnOM cKey,UCHAR cMask)
+BmA4/P$ {
df}B:?Ew. BOOL bAdded=FALSE;
fyT! / for(int index=0;index<MAX_KEY;index++){
-j<m0XUQ if(hCallWnd[index]==0){
m_oBV|v{ hCallWnd[index]=hWnd;
852$Ui|I HotKey[index]=cKey;
y=-d*E HotKeyMask[index]=cMask;
ZO:{9vt=/ bAdded=TRUE;
Q"%L KeyCount++;
-K+gr sb
g break;
J>x)J}:; }
R0 {+Xd }
v^JyVf> return bAdded;
%J3#4gG^v }
r0?`t!%V //删除热键
PE+N5n2Tl BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,8@@r7 {
<#sB ; BOOL bRemoved=FALSE;
RDk{;VED{ for(int index=0;index<MAX_KEY;index++){
S =eP/
if(hCallWnd[index]==hWnd){
*9*6n\~aI if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
">NBPanJ hCallWnd[index]=NULL;
<Eq^rh HotKey[index]=0;
rXvvJIbi HotKeyMask[index]=0;
0G;RMR ':5 bRemoved=TRUE;
ai#0ZgO KeyCount--;
^h=;]vxO break;
65qH }
v='7.A }
eRC@b^~ }
mii9eZ return bRemoved;
aZ#c_Q#gZ }
B
+_D*a m &c8@-T hNSV}~h DLL中的钩子函数如下:
sLb[ZQ;j oQFpIX;\m LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>e"1a/2%>& {
9
bGN5.5 BOOL bProcessed=FALSE;
Va?wG3 w if(HC_ACTION==nCode)
znX2W0V {
;w[|IRa if((lParam&0xc0000000)==0xc0000000){// 有键松开
:@ 19,.L switch(wParam)
B3e{'14 {
%q(n'^#Z.y case VK_MENU:
LR'F/.Dx MaskBits&=~ALTBIT;
AgO:"'c break;
/tx_I(6F?| case VK_CONTROL:
M {_`X MaskBits&=~CTRLBIT;
KYd2=P6 break;
MZ6?s(mkx case VK_SHIFT:
'9H]SEw MaskBits&=~SHIFTBIT;
7J7uHl`yq` break;
Q{V|{yV^y default: //judge the key and send message
f GY. +W_ break;
&`0heJ
5Yn }
qzsS"=5 for(int index=0;index<MAX_KEY;index++){
pOpie5)7X if(hCallWnd[index]==NULL)
^=FtF9v continue;
[P,1UO|$B if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-0Y8/6]( {
{>>f5o3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
]hN%~
~$> bProcessed=TRUE;
_K8ob8)m }
{}{|trr-E }
:W 8DgL>l }
B?$pIG^Mn else if((lParam&0xc000ffff)==1){ //有键按下
YM/^-[k3 switch(wParam)
sf@g $ {
@y{Whun~ case VK_MENU:
ZOyq{w!2 MaskBits|=ALTBIT;
UvxJ _ break;
I4gyGg$H case VK_CONTROL:
YjoN:z`b MaskBits|=CTRLBIT;
r68'DJ&m3 break;
teQ%t~PJ-& case VK_SHIFT:
0=yKE J MaskBits|=SHIFTBIT;
3QZw break;
Azq,N@HO default: //judge the key and send message
;Rt?&&W break;
)!e-5O49r }
2Cj?k.Zk for(int index=0;index<MAX_KEY;index++){
dEJ>8e8 if(hCallWnd[index]==NULL)
%dKUB4 continue;
%v4/.4sR,; if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
)9l5gZX'I {
'$UlJDZ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
mdtq-v bProcessed=TRUE;
j ]F
Zy }
/0\m;& }
] +LleS5 }
BoHMz/DB if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
aKhI|%5kA for(int index=0;index<MAX_KEY;index++){
WdnCRFO?l if(hCallWnd[index]==NULL)
a$l/N{<. continue;
J}nE,U2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
uJ {N? SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Pv+[N{ //lParam的意义可看MSDN中WM_KEYDOWN部分
nkSYW]aQ1g }
2_R'Kl![ }
N? ky2wG }
q;InFV3rv return CallNextHookEx( hHook, nCode, wParam, lParam );
=VH, i/@ }
9Psy$ w*f.Fu(su 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:
$
GL$
iA KaZ$!JfT BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
P}KyT?X: BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
2~K.m@U}!Z K9;pX2^z9 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
Sz.jv#Y =pF 6 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
#,0%g1 {
.UU BAyjm if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
oZA?}#DRl {
K\`L>B. 1 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
mflH &Bx9 SaveBmp();
x$cs_q]J return FALSE;
^$4d' }
4M}u_}9 …… //其它处理及默认处理
HUfH/x3zj] }
o>';-} E 2$jTj<.K ?A3pXa 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。
%S]H ZYos.ay 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。
"Rf8#\Y/< YrS%Yvhj0 二、编程步骤
0-oR
{
{ f|cd_?| 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";
.|NF8Fj %J!+f-:= 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
f.!)O@HzH Vp.($ 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;
Z}5;K"T/ .:B]
a7b 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;
?J<Y] c6:"5};_ 5、 添加代码,编译运行程序。
8&7LF jV;&*4if 三、程序代码
zZ3,e L <iajtq<Z ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
=cs;avtL #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
4=9To|U* #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
F0t!k> #if _MSC_VER > 1000
!?`5r)K #pragma once
yS _,lS #endif // _MSC_VER > 1000
cE
'`W7&A #ifndef __AFXWIN_H__
Y 4sf 2w #error include 'stdafx.h' before including this file for PCH
x JQde 4 #endif
0C#1/o)o #include "resource.h" // main symbols
&B1d+.+ class CHookApp : public CWinApp
]rO`eN[~U {
)2C_6eR public:
g>_lU
vSE CHookApp();
.cdm@_Ls // Overrides
/%\E2+6 // ClassWizard generated virtual function overrides
X3NHQMI //{{AFX_VIRTUAL(CHookApp)
a;|C51GH public:
qPK3"fzH virtual BOOL InitInstance();
_%Sorr virtual int ExitInstance();
*-(J$4RNz //}}AFX_VIRTUAL
n_Px=s!1p@ //{{AFX_MSG(CHookApp)
lpQsmd# // NOTE - the ClassWizard will add and remove member functions here.
~+d?d6*c // DO NOT EDIT what you see in these blocks of generated code !
, |CT|2D> //}}AFX_MSG
rR@ t5 DECLARE_MESSAGE_MAP()
,F`:4=H% };
D642}VD LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
j(F&*aH78 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Yv\.QrxPm BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
awQf$ BOOL InitHotkey();
;Oh4W<hH} BOOL UnInit();
<i``#"/ #endif
<7fF9X ]1>U@oK //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
:A%uXgK<k #include "stdafx.h"
L:"i,K#P #include "hook.h"
J?&lpsB3_l #include <windowsx.h>
|#q 5#@, #ifdef _DEBUG
J)vP<.3: #define new DEBUG_NEW
))^rk6 #undef THIS_FILE
oqH811 static char THIS_FILE[] = __FILE__;
$=uyZTYF)} #endif
}A3(g$8KR #define MAX_KEY 100
d?C8rkV' #define CTRLBIT 0x04
qRT1W re
3 #define ALTBIT 0x02
+/y 3]} #define SHIFTBIT 0x01
M)C.bo{p #pragma data_seg("shareddata")
D_ybgX?0: HHOOK hHook =NULL;
Y
O;N9wu3f UINT nHookCount =0;
xWWfts1t static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
/PH+K24v~ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
h~)oiT2v static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
B- =*"H?q static int KeyCount =0;
xwhH_[ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
2qLRcA=R #pragma data_seg()
) E.KB6 HINSTANCE hins;
/~)vma1< void VerifyWindow();
t33/QW
r BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
uF_gfjR[m //{{AFX_MSG_MAP(CHookApp)
-e_IDE // NOTE - the ClassWizard will add and remove mapping macros here.
9`yG[OA // DO NOT EDIT what you see in these blocks of generated code!
i,=greA]" //}}AFX_MSG_MAP
t$^1A1Ef END_MESSAGE_MAP()
Z[<rz6%cB m:CiXM CHookApp::CHookApp()
i$gm/ZO {
7Gd)=Q{uur // TODO: add construction code here,
N>!RKf:ir // Place all significant initialization in InitInstance
+O>!x#)&" }
0l#gS; kKFmTo
CHookApp theApp;
`W,gYH7 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
6AV@O {
2mN>7Tj: BOOL bProcessed=FALSE;
WW82=2rJ9 if(HC_ACTION==nCode)
zim]3%b*A; {
^Lr)STh if((lParam&0xc0000000)==0xc0000000){// Key up
nQ2V switch(wParam)
k_?xiOSh {
ikf!7-, case VK_MENU:
W8+Daw1Nr MaskBits&=~ALTBIT;
,=whwl "tA break;
sJo]$/?F case VK_CONTROL:
,Q!sns[T MaskBits&=~CTRLBIT;
`p1szZD& break;
S e/VOzzg case VK_SHIFT:
U\'.rT[# MaskBits&=~SHIFTBIT;
[<`K%1GQ break;
ieXhOA default: //judge the key and send message
+U_> Bo break;
0PO'9# }
a]XQM$T$ for(int index=0;index<MAX_KEY;index++){
c+chwU0W if(hCallWnd[index]==NULL)
-jy-KC continue;
.^j 6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
m-9{@kgAM? {
EEFM1asJf SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qXPjxTg{[ bProcessed=TRUE;
o5?f]Uq5 , }
yk OJhd3 }
OEmz`JJ67 }
J4 [7*v else if((lParam&0xc000ffff)==1){ //Key down
#ky]@vyO switch(wParam)
l6Wa~ E {
LN}eD\ case VK_MENU:
/T&z
:st0 MaskBits|=ALTBIT;
TD:NL4dm break;
l]D?S]{a case VK_CONTROL:
Lh.?G#E M MaskBits|=CTRLBIT;
?;Dh^mc break;
5>+>=)* case VK_SHIFT:
ZD\`~I|gp MaskBits|=SHIFTBIT;
COPH)Bdq. break;
Y-\/Y*;cd default: //judge the key and send message
aC:Sy^Tf break;
5q?2?j/h }
Z]f_?@0 for(int index=0;index<MAX_KEY;index++)
))f%3_H {
%B+W#Q` if(hCallWnd[index]==NULL)
6U[`CGL66 continue;
t=M:L[bis; if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
R{Q*"sf {
U5Say3r SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
1FCqkwq[ bProcessed=TRUE;
mOji\qia }
6vp\~J }
W FVx7 }
vW,dJ[N6jm if(!bProcessed){
wz^Q,Od for(int index=0;index<MAX_KEY;index++){
Ojqbj0E9 if(hCallWnd[index]==NULL)
.y'iF>QQ\ continue;
6\>S%S2: if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
1|$V SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
[iVCorU }
'q%56WAJ }
pleLdGq }
OI0#@_L& return CallNextHookEx( hHook, nCode, wParam, lParam );
2z9\p%MX }
_K"|}bM PqV9k,5f BOOL InitHotkey()
V|GH4DT= {
/RD@ [ 8 if(hHook!=NULL){
Za68V/Vj nHookCount++;
y)iT-$bQ return TRUE;
$D{KXkrd }
*Kj*| >) else
c\"t+/Z hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
K%AbM#o< if(hHook!=NULL)
zUX%$N+w}> nHookCount++;
sq
`f?tA? return (hHook!=NULL);
KwGk8$ U }
gB/4ro8 BOOL UnInit()
f P'qUN {
7u[U %yd if(nHookCount>1){
:pj00 nHookCount--;
lbM)U return TRUE;
A9Cq(L_H }
rg Gm[SL*< BOOL unhooked = UnhookWindowsHookEx(hHook);
*J[3f]PBmR if(unhooked==TRUE){
CqW:m*c nHookCount=0;
?d@3y<A,~ hHook=NULL;
#ra"(/) }
$n_'#m2LE return unhooked;
O.61-rp }
$HVus=D" ~uqpF-. BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
WAr;g?Q8 {
t^eWFX BOOL bAdded=FALSE;
y/U(v"'4U for(int index=0;index<MAX_KEY;index++){
kA3nhBH if(hCallWnd[index]==0){
ffMh2 hCallWnd[index]=hWnd;
vv='.R, D HotKey[index]=cKey;
n^F:p*)Q% HotKeyMask[index]=cMask;
&o{= bAdded=TRUE;
~*:{U KeyCount++;
nnr
g^F break;
`/ ]Th&(5 }
#p'Xq
}] }
+ob<?
T return bAdded;
g\9I&z~? }
_dQVundH mocR_3=Q? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
CjtBQ5 {
<1")JDW BOOL bRemoved=FALSE;
tA#7Xr+ for(int index=0;index<MAX_KEY;index++){
5f5bhBZ< if(hCallWnd[index]==hWnd){
,/{(8hn if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)qXl8H I hCallWnd[index]=NULL;
) 0p9I0= HotKey[index]=0;
[[uKakp
HotKeyMask[index]=0;
Bw5zh1ALC; bRemoved=TRUE;
h)S223[ KeyCount--;
XLwmXi break;
b|
e7mis@ }
yGGQ;!/ }
K@uUe3 }
{+D
6o return bRemoved;
E?$|`<o{|` }
uu08q<B5b) TL^af- void VerifyWindow()
nR%ASUx:Y {
06hzCWm# for(int i=0;i<MAX_KEY;i++){
zj~(CNE if(hCallWnd
!=NULL){ =&Dt+f&
if(!IsWindow(hCallWnd)){ "ecG\}R=
hCallWnd=NULL; ]J<2a`IK!
HotKey=0; bbGSh|u+P
HotKeyMask=0; luA k$Es
KeyCount--; [!^Q_O
} 8sMDe'
} B 4s^X`?z
}
pwj ?
} ?&qa3y)wX:
%V40I{1
BOOL CHookApp::InitInstance() 4k}3^.#
{ )-2sk@y
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Xr?(w(3
hins=AfxGetInstanceHandle(); 2oY.MQD7iW
InitHotkey(); 4J #F;#iA
return CWinApp::InitInstance(); +y%"[6c|
} lrn3yDkR?
CcF$?07 i
int CHookApp::ExitInstance() bCv=Uo,+6
{ DV={bcQ
VerifyWindow(); U`{'-L.
UnInit(); "Jd!TLt\x
return CWinApp::ExitInstance(); P'EPP*)q
} n^} -k'l
fY)Dx c&ue
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file YH_mWN\Wu
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +sN'Y/-
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ aT9+]
Ig
#if _MSC_VER > 1000 qN5 ru2
#pragma once gmCW__oR
#endif // _MSC_VER > 1000 zDEX `~c
J<p.J3I
class CCaptureDlg : public CDialog M:%6$``
{ 5m.{ayE
// Construction 7'c ;$~
public: +I>u${sVx*
BOOL bTray; uc.dtq!
BOOL bRegistered; U[4Xo&`
BOOL RegisterHotkey(); J%8M+!`F
UCHAR cKey; 4CUoXs'
UCHAR cMask; s^atBqw,
void DeleteIcon(); (P(=6-0
void AddIcon(); E5^P*6c(
UINT nCount; O=,[u?
void SaveBmp(); _J|TCm
CCaptureDlg(CWnd* pParent = NULL); // standard constructor [#+yL
// Dialog Data iD;pXE{2s%
//{{AFX_DATA(CCaptureDlg) O)0}yF$0
enum { IDD = IDD_CAPTURE_DIALOG }; @D?KS;#
CComboBox m_Key; c"nowbf
BOOL m_bControl; hxCSE$f4
BOOL m_bAlt; |2i=oX(r|
BOOL m_bShift; wiwAdYEQ\
CString m_Path; dC&OjBQ
CString m_Number; K-_XdJ\
//}}AFX_DATA 74[wZDW|(
// ClassWizard generated virtual function overrides SJseP_-
//{{AFX_VIRTUAL(CCaptureDlg) GJu[af
public: <7U\@si4
virtual BOOL PreTranslateMessage(MSG* pMsg); 2)iwAu
protected: +ESEAi91
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pKxsK^O5[
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); IE)$.%q;)
//}}AFX_VIRTUAL n\-nBrVSf
// Implementation
U(d K
protected: ?L%BD7
HICON m_hIcon; ^{Vt
// Generated message map functions #8Bs15aV
//{{AFX_MSG(CCaptureDlg) u-8b,$@Z>'
virtual BOOL OnInitDialog(); S.<aCN<@
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); p`dH4y]D
afx_msg void OnPaint(); `Z#0kpXk_
afx_msg HCURSOR OnQueryDragIcon(); #9(0.!v
virtual void OnCancel(); @3^D[
afx_msg void OnAbout(); ?%|w?Fdx-
afx_msg void OnBrowse(); _u[2R=h
afx_msg void OnChange(); 1g{-DIOmn
//}}AFX_MSG Nld y76|g
DECLARE_MESSAGE_MAP() u<g0oEs)
}; r<%ua6@
#endif H^VNw1.
S7B7'[ru
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >/]`
f8^
#include "stdafx.h" Io(*_3V)B
#include "Capture.h" 2`|gnVw
#include "CaptureDlg.h" ;+Dq3NE
#include <windowsx.h> As}eI!
#pragma comment(lib,"hook.lib") ?Iin/ <y
#ifdef _DEBUG 9wTN*y
#define new DEBUG_NEW jkQ%b.a
#undef THIS_FILE G!u+~{g
static char THIS_FILE[] = __FILE__; {Vw\#/,
#endif 6>yfm4o
#define IDM_SHELL WM_USER+1 ~nVO%IxM4J
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); azs lNL
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); gNWTzz<[f>
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [%0{7pz}
class CAboutDlg : public CDialog rN3qTp
{ \&6^c=2=
public: @#j?Z7E|
CAboutDlg(); iL$~d@AEn
// Dialog Data FI(iqSJ6
//{{AFX_DATA(CAboutDlg) d3[O!4<T
enum { IDD = IDD_ABOUTBOX }; (u{?aG~
//}}AFX_DATA tk5zq-/d
// ClassWizard generated virtual function overrides f-!P[6bY
//{{AFX_VIRTUAL(CAboutDlg) wv7XhY}
protected: hZ[(Ik]*Zd
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ah?,9r=U
//}}AFX_VIRTUAL ^t$xR_
// Implementation @^2?97i
c
protected: O x),jc[/
//{{AFX_MSG(CAboutDlg) u_Wftb?9
//}}AFX_MSG {vhP'!a6W
DECLARE_MESSAGE_MAP() anzt;V.;Y
}; #Q]^9/;|4n
N^TE
;BM
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @Y&UP
{ XkEJ_;:
//{{AFX_DATA_INIT(CAboutDlg) tP.jJC~
//}}AFX_DATA_INIT H{BP7!t[V
} ]aMeMhe-
m ]h<y
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6IPQ}/l
{ 3J_BuMV
CDialog::DoDataExchange(pDX); (-[73v-w
//{{AFX_DATA_MAP(CAboutDlg) 4Zn" K}q
//}}AFX_DATA_MAP Mb^E
} ,J4rKGG
W\pO`FL
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4G_At
//{{AFX_MSG_MAP(CAboutDlg) 3F gTM(
// No message handlers CX}==0od
//}}AFX_MSG_MAP $<s;YhM:u)
END_MESSAGE_MAP() ]zATdfa
?r'2GR2Sk4
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) h@{mcz
: CDialog(CCaptureDlg::IDD, pParent) _)U.5f<
{ 69?wZfj'
//{{AFX_DATA_INIT(CCaptureDlg) I^l\<1"]
m_bControl = FALSE; 9 S4bg7
m_bAlt = FALSE; $X_A74(
m_bShift = FALSE; KCl85Wi'
m_Path = _T("c:\\"); di4>Ir~]
m_Number = _T("0 picture captured."); M(Tlkr
nCount=0; 61~7 L^882
bRegistered=FALSE; Fd;%wWY.zm
bTray=FALSE; ]ft}fU5C1
//}}AFX_DATA_INIT U~GQ JR
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 YHOo6syk
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); M~ku4ZP
} NiSH$MJ_
[vTk*#Cl4
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~wFiq)v(
{ 7t3ps
CDialog::DoDataExchange(pDX); DLH|y%"
//{{AFX_DATA_MAP(CCaptureDlg) vACJE
DDX_Control(pDX, IDC_KEY, m_Key); \(&UDG$
DDX_Check(pDX, IDC_CONTROL, m_bControl); !Z!X]F-fY
DDX_Check(pDX, IDC_ALT, m_bAlt); j[${h,p?
DDX_Check(pDX, IDC_SHIFT, m_bShift); KQTv5|$?
DDX_Text(pDX, IDC_PATH, m_Path); $1uT`>%
DDX_Text(pDX, IDC_NUMBER, m_Number); HZ[.,DuW
//}}AFX_DATA_MAP K"/3/`T
} +GvPJI
x(+H1D\W
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) b V&"jjEx
//{{AFX_MSG_MAP(CCaptureDlg) -R-yr.$j*
ON_WM_SYSCOMMAND() \~>
.NH-
ON_WM_PAINT() _J X>#h
ON_WM_QUERYDRAGICON() `{1~]?-&
ON_BN_CLICKED(ID_ABOUT, OnAbout) @q"HZO[
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) y#{v\h
Cz
ON_BN_CLICKED(ID_CHANGE, OnChange) _KJ!C!
//}}AFX_MSG_MAP n+57# pS7
END_MESSAGE_MAP() NHQi_U
rK[;wD<
BOOL CCaptureDlg::OnInitDialog() tUk)S
{ b!JrdJO,DP
CDialog::OnInitDialog(); 'Bwv-J
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); x
K ;#C
ASSERT(IDM_ABOUTBOX < 0xF000); \A 5Na-/9
CMenu* pSysMenu = GetSystemMenu(FALSE); o/hj~;(]
if (pSysMenu != NULL) LDY3Ya`6m
{ 2GxkOch
CString strAboutMenu; Z 5 Xis"j
strAboutMenu.LoadString(IDS_ABOUTBOX); d:#z{V_
if (!strAboutMenu.IsEmpty()) `t#9
yN
{ 9UCA&n
pSysMenu->AppendMenu(MF_SEPARATOR); %W^Zob
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?k^~qlye
} b8LA|#]i
} 4x-K0
SetIcon(m_hIcon, TRUE); // Set big icon yVe<+Z\7
SetIcon(m_hIcon, FALSE); // Set small icon dK41NLGQ
m_Key.SetCurSel(0); ;R]~9Aan
RegisterHotkey(); k`BS{,=
CMenu* pMenu=GetSystemMenu(FALSE); _t>[gB,
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); l\WN
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 3}lIY7O
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); :n,x?bM
return TRUE; // return TRUE unless you set the focus to a control ?|Ey WAL
} UaB2vuL*=
j@R"AP}
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) L:\>)6]Ls
{ CrB4%W:{
if ((nID & 0xFFF0) == IDM_ABOUTBOX) g&rz*)|/
{ TPn#cIPG
CAboutDlg dlgAbout; PsM8J
dlgAbout.DoModal(); 3qkPe_<I
} G_`Ae%'h
else t=fr`|!
{ e F)my
CDialog::OnSysCommand(nID, lParam); P9)L1l<3I
} ue*o>iohB
}
H 3so&_
=~TPrO^
void CCaptureDlg::OnPaint() ?&=JGk^eJ
{ "?^#+@LV
if (IsIconic()) M<r]a{Yv
{ Gkm{b[
CPaintDC dc(this); // device context for painting W~FU!C?]
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); yN/g;bQ
// Center icon in client rectangle aVZ/e^kk-
int cxIcon = GetSystemMetrics(SM_CXICON); S3s6
int cyIcon = GetSystemMetrics(SM_CYICON); #nq_R
CRect rect; %-[*G;c'w
GetClientRect(&rect); Z^Yy
sf
int x = (rect.Width() - cxIcon + 1) / 2; Xp9 ]
9H.
int y = (rect.Height() - cyIcon + 1) / 2; tgj5l#P
// Draw the icon LIll@2[
dc.DrawIcon(x, y, m_hIcon); F!g;}_s9
} P$.$M}rMv
else &crR nv?
{ K >Q6
CDialog::OnPaint(); OAaLCpRp
} Dq-[b+bm
} aeDhC#h
.{-X1tJ7
HCURSOR CCaptureDlg::OnQueryDragIcon() J:@yG1VIp
{ %2\6.c=c
return (HCURSOR) m_hIcon; b94+GLU8b
} |I;]fH,+
4K
]*bF44
void CCaptureDlg::OnCancel() $>T(31)c
{ &eb8k2S
if(bTray) s>)?MB*vb
DeleteIcon(); h; 6G~D
CDialog::OnCancel(); fw5+eTQ^
} vSR5F9
mkq246<D~
void CCaptureDlg::OnAbout() mWUd-| Ul
{ UOyM=#ipY
CAboutDlg dlg; J%lrXm(l{
dlg.DoModal(); u$FL(m4
} <"8F=3:uk
4"UH~A;^
void CCaptureDlg::OnBrowse() 2f1Q&S
{ r4d#;S9{o
CString str; y
t7 >,
BROWSEINFO bi; M9G?^mW1sT
char name[MAX_PATH]; %K,cGgp^)
ZeroMemory(&bi,sizeof(BROWSEINFO)); bVzJOBe
bi.hwndOwner=GetSafeHwnd(); !ST7@D
bi.pszDisplayName=name; {9*
l
bi.lpszTitle="Select folder"; T-h[$fxR_
bi.ulFlags=BIF_RETURNONLYFSDIRS; Ta$55K0
LPITEMIDLIST idl=SHBrowseForFolder(&bi); uw/N`u
if(idl==NULL) 4C )sjk?m
return; 3Kc9*]D
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); U'u_'5{
str.ReleaseBuffer(); eaDR-g"
m_Path=str; <{h\Msx%
if(str.GetAt(str.GetLength()-1)!='\\') eJ6 #x$I,
m_Path+="\\"; >f4[OBc
UpdateData(FALSE); i(;.Y
} 6uTC2ka[&R
U2LD_-HZ
void CCaptureDlg::SaveBmp() rGrR;
{ G9Noch9
g
CDC dc; 4 Dy1M}7
dc.CreateDC("DISPLAY",NULL,NULL,NULL); @R<z=n"
CBitmap bm; /ZM
xVh0
int Width=GetSystemMetrics(SM_CXSCREEN); 9m)gp19YA
int Height=GetSystemMetrics(SM_CYSCREEN); LG:d
bm.CreateCompatibleBitmap(&dc,Width,Height); XpYd|BvW
CDC tdc; e.^?hwl
tdc.CreateCompatibleDC(&dc); K4]#X"
CBitmap*pOld=tdc.SelectObject(&bm); x!7r7|iV
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); fg lN_
tdc.SelectObject(pOld); ox_DEg7l
BITMAP btm; R"l6|9tmP
bm.GetBitmap(&btm); B_D0yhh
DWORD size=btm.bmWidthBytes*btm.bmHeight; |~#A?mK-
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); IVy<>xpt
BITMAPINFOHEADER bih; oW(EV4J"
bih.biBitCount=btm.bmBitsPixel; yo(MJ^=d
bih.biClrImportant=0; O hRf&5u$
bih.biClrUsed=0; /r2S1"(q
bih.biCompression=0; ZpMv16
bih.biHeight=btm.bmHeight; @eutp`xoT\
bih.biPlanes=1; >?_}NZ,y
bih.biSize=sizeof(BITMAPINFOHEADER); y^[t3XA6Q
bih.biSizeImage=size; fwmXIpteK
bih.biWidth=btm.bmWidth; o5sw]R5
bih.biXPelsPerMeter=0; uF1&m5^W
bih.biYPelsPerMeter=0; ^vTx%F
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); mkfDDl2 GP
static int filecount=0; P#Whh
CString name; ;<mcvm
name.Format("pict%04d.bmp",filecount++); Mlr'h}:H
name=m_Path+name; j9yOkaVEg
BITMAPFILEHEADER bfh; |i~-,:/-Y
bfh.bfReserved1=bfh.bfReserved2=0; LwTdmR
bfh.bfType=((WORD)('M'<< 8)|'B'); /n6ZN4
bfh.bfSize=54+size; oRJ!TAbD
bfh.bfOffBits=54; hS*&p0YV~M
CFile bf; ]Yf^O @<<>
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !@wUARQ
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {$5g29
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); w{u,YM(Q
bf.WriteHuge(lpData,size); f$9|qfW'$
bf.Close(); 4q:8<*W=
nCount++; J}+N\V~
} G9V2(P
GlobalFreePtr(lpData); FFcIOn
if(nCount==1) +'+Nr<
m_Number.Format("%d picture captured.",nCount); X
y`2ux+>/
else Z:Vde^Ih
m_Number.Format("%d pictures captured.",nCount); iz)r.TJ
UpdateData(FALSE); ]N;nq
} mq:WBSsV
US=K}B=g
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =,C]d~
{ ~kj96w4eAR
if(pMsg -> message == WM_KEYDOWN) ?m+];SJk
{ wjZ Q.T!
if(pMsg -> wParam == VK_ESCAPE) Gy;Fe=
return TRUE; XT*/aa-1'
if(pMsg -> wParam == VK_RETURN) s$,G5Feub
return TRUE; 9+$IulOvk
} 2+?W{yAEi
return CDialog::PreTranslateMessage(pMsg); *DXX*9 0
} ?B$L'i[l
F6{/iF
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) isdNW l
{ =
Ezg3$%-
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ xK)<763q>
SaveBmp(); M2R krW#
return FALSE; s;E(51V<>
} W}"tf
L8
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Nd_A8H,&B
CMenu pop; eM5-v-
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); n%G[Y^^,
CMenu*pMenu=pop.GetSubMenu(0); G@Sqg
pMenu->SetDefaultItem(ID_EXITICON); \jV2":[%c
CPoint pt; 9<i M2(IW{
GetCursorPos(&pt); MxUbx+_N
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?.uhp
if(id==ID_EXITICON) k@s<*C
DeleteIcon(); ixK9/5T
else if(id==ID_EXIT) Dgc6rv#
OnCancel(); F|y0q:U
return FALSE; 'Z=_zG/RX
} ?'|GGtvm
LRESULT res= CDialog::WindowProc(message, wParam, lParam); cHR*.
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) V6_5v+n
AddIcon(); );yZyWDV
return res; ,3iD/8_
} 0v9i43[S|J
akPd#mf
void CCaptureDlg::AddIcon() Iw`|,-|
{ jcvq:i{
NOTIFYICONDATA data; l:bbc!3
data.cbSize=sizeof(NOTIFYICONDATA); e==/+
CString tip; #Ef! X
tip.LoadString(IDS_ICONTIP); n7Bv~?DM
data.hIcon=GetIcon(0); mF!4*k
data.hWnd=GetSafeHwnd(); %Tu(>vnuj
strcpy(data.szTip,tip); !.MbPPNp
data.uCallbackMessage=IDM_SHELL; a&2x;diF
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; EYZ&%.Sy5
data.uID=98; Y2tBFeWY
Shell_NotifyIcon(NIM_ADD,&data); !4gHv4v;
ShowWindow(SW_HIDE); n[r1h=?j3
bTray=TRUE; X8}\m%gCU
} SK&1l`3
F(Zf=$cx
void CCaptureDlg::DeleteIcon() iPY)Ew`Im
{ [{R>'~
NOTIFYICONDATA data; Z]WX 7d
data.cbSize=sizeof(NOTIFYICONDATA); __s'/6u
data.hWnd=GetSafeHwnd(); |,S]EHIy
data.uID=98; nUVk;0at
Shell_NotifyIcon(NIM_DELETE,&data); w-$iKtb.
ShowWindow(SW_SHOW); V@s93kh
SetForegroundWindow(); ,)!%^~v
ShowWindow(SW_SHOWNORMAL); ntB#2S
bTray=FALSE; ,quUGS
} BFP@Yn~k
{oF;ZM'r
void CCaptureDlg::OnChange() Vr"'O6
{ ^+-]V9?+
RegisterHotkey(); [{#TN
} 2M\7j
WA1yA*S
BOOL CCaptureDlg::RegisterHotkey() \ZhkOl
{ $Q}L*4?]
UpdateData(); p,|)qr:M
UCHAR mask=0; @jjxgd'%&
UCHAR key=0; 92R,o'#
if(m_bControl) F7w\ctUP
mask|=4; 6(t'B!x
if(m_bAlt) CS*lk!C
mask|=2; [`E_/95
if(m_bShift) [McH l1a
mask|=1; ?/5<}W#7}
key=Key_Table[m_Key.GetCurSel()]; xluAjOQ6
if(bRegistered){ hVT>HER
DeleteHotkey(GetSafeHwnd(),cKey,cMask); $FIJI^Kd7
bRegistered=FALSE; TOgH~R=
} 8tf>G(I{
cMask=mask; ]]`[tVaFr
cKey=key; Z,\(bW
qF
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); RhT:]
return bRegistered; =h=-&DSA
} `1Md1e:J
sh0x<_
四、小结 Q%!xw(
7<(U`9W/q
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。