在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
5'"9)#Ve
#_fL[j& 一、实现方法
}?%5Ae7l, R<8!lQ4s 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:
H:L<gv(rG +dK;\wT #pragma data_seg("shareddata")
2-u9% HHOOK hHook =NULL; //钩子句柄
q6N6QI8/ UINT nHookCount =0; //挂接的程序数目
4kf8Am( static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
!\1Pu| static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
gA DF static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
^$F1U,oi static int KeyCount =0;
o[K,( static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
JXF@b-c #pragma data_seg()
;PX>] r5U0 ]s:%joj%^ 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
W&0KO-}ot +,ojlTVlt DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
p EbyQ[ nfjwWDH BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
[>U =P` cKey,UCHAR cMask)
si3@R?WR6* {
ir3EA'_>N BOOL bAdded=FALSE;
~i/K7qZ for(int index=0;index<MAX_KEY;index++){
qEV>$>} if(hCallWnd[index]==0){
"~/O>.p hCallWnd[index]=hWnd;
!%%(o%bi~ HotKey[index]=cKey;
@t?uhT*Z= HotKeyMask[index]=cMask;
]Br6!U4~ bAdded=TRUE;
d;O4)8> KeyCount++;
Omy<Y@$ break;
*k
^?L }
'Q F@@ 48 }
,fW%Qv return bAdded;
E*X-f" }
80;^]l
//删除热键
"s5[w+,R BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-yP_S~\n {
1=Nh<FuQ BOOL bRemoved=FALSE;
s+OXT4>+ for(int index=0;index<MAX_KEY;index++){
VgyY7INx9 if(hCallWnd[index]==hWnd){
aJ^RY5 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
TQg~I/ hCallWnd[index]=NULL;
2Bg0
M HotKey[index]=0;
\RDS~u\d HotKeyMask[index]=0;
c
1o8 bRemoved=TRUE;
hO] vy>i; KeyCount--;
Yb;$z' break;
u</LgOP`- }
#9ZHt5T=$ }
@X g5E }
5VR=D\j return bRemoved;
38l 8n. }
$Cx ?%X^b bx8;`QMX @m+2e C77 DLL中的钩子函数如下:
>#~>!cv6D 0l+[[ZTV LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
?0J&U4 {
>JckN4v BOOL bProcessed=FALSE;
[h[@?8vB if(HC_ACTION==nCode)
AMf{E {
?3=y]Vb+ if((lParam&0xc0000000)==0xc0000000){// 有键松开
%"CF-K@th switch(wParam)
yeqHeZ {
Vc*"Q8aZ~ case VK_MENU:
6Mh"{N7 MaskBits&=~ALTBIT;
7w51UmO break;
c%@<
h6 case VK_CONTROL:
&.1qixXIr MaskBits&=~CTRLBIT;
&\$~ break;
5DxNHEuS case VK_SHIFT:
'B yB1NL MaskBits&=~SHIFTBIT;
q@[UeXu?pZ break;
[D_s`'tg default: //judge the key and send message
l#bE_PD; break;
;fe~PPT }
Gw-y6e'|Y for(int index=0;index<MAX_KEY;index++){
b>]k=zd if(hCallWnd[index]==NULL)
$q*hE&x
Qd continue;
zw[ #B # if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%fMFcL#h {
MnTJFo" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
8@,8j!$8G bProcessed=TRUE;
)}lO%B'K }
4@r76v}{ }
Dgc}T8R }
w:aV2 else if((lParam&0xc000ffff)==1){ //有键按下
9 iV_ switch(wParam)
zmhL[1qj {
YHzP/&0 case VK_MENU:
TpcJ1*t MaskBits|=ALTBIT;
COA*Q break;
/tj_WO_ case VK_CONTROL:
7sq15oL MaskBits|=CTRLBIT;
.<4U2h break;
L<k(stx~ case VK_SHIFT:
`*",_RO; MaskBits|=SHIFTBIT;
P&IS$FC.\ break;
W:>XXUU default: //judge the key and send message
XaF;IS@A break;
>|aVGY }
w8cbhc for(int index=0;index<MAX_KEY;index++){
Yk0/f|>O if(hCallWnd[index]==NULL)
=[,EFkU?B continue;
N\anjG if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?=G{2E. {
C#n.hgo>I SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
L)c]i'WZ bProcessed=TRUE;
@,m 7%, }
upnX7as }
OlP1Zd/l }
=q}Z2 OoYh if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
nK}-^Ur for(int index=0;index<MAX_KEY;index++){
wZVLpF+7 if(hCallWnd[index]==NULL)
OwPXQ 3S continue;
57KrDxE} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
hP}-yW6] SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
WO6R04+WV //lParam的意义可看MSDN中WM_KEYDOWN部分
<99/7># }
Rn)fwGC }
\5}*;O@ }
vNju|=Lo return CallNextHookEx( hHook, nCode, wParam, lParam );
B=~uJUr }
(8~D^N6Z f@2F! 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:
%C_c%3d 6F5g2hBz BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
5O;D\M{> BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
1@i/N (3~^zwA 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:
eD8e0
D'S 3m$ck$ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
s
bd$.6
|& {
!f]kTs]j~ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
:| !5d{8S8 {
eV~"T2!Sb //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
[N#4H3GM8 SaveBmp();
+,cd$,18 return FALSE;
)7p(htCz5 }
P| hwLM …… //其它处理及默认处理
G;d3.ml/aZ }
0Y:)$h2? [b_qC'K[ J~n|5*cz 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
0wCQPvO
i[ >U#5 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
)7X$um UB+7]S 二、编程步骤
o/Q|R+yXV 4j8$&~/ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
Ud7Z7?Ym ?^2nrh,n+ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
v*&jA8D CO9PQ`9+ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
7t1as. i"xV=. 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
g5RH:]DV gVe]?Jva` 5、 添加代码,编译运行程序。
8&nb@l ~$C}?y^ a 三、程序代码
R7K`9 c1f6 ^d@2Y0hH ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
z>\l%_w #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
EeT69o #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
3fA+{Y8S #if _MSC_VER > 1000
q"6$#o{~U #pragma once
8a&c=9 #endif // _MSC_VER > 1000
l~w^I|M^C #ifndef __AFXWIN_H__
IC (:RtJ #error include 'stdafx.h' before including this file for PCH
,RM8D)m\ #endif
{M7`"+~w #include "resource.h" // main symbols
r
d-yqdJ class CHookApp : public CWinApp
2g~ @99` {
q
|FOU public:
Kn<+Au_]L CHookApp();
d7mn(= & // Overrides
EpQy;#=; // ClassWizard generated virtual function overrides
#"lb9._M //{{AFX_VIRTUAL(CHookApp)
K0>+-p oL public:
YM6
J:89 virtual BOOL InitInstance();
97$Q?a8S@ virtual int ExitInstance();
!icI Rqcf= //}}AFX_VIRTUAL
M nZljB //{{AFX_MSG(CHookApp)
F\^8k /0 // NOTE - the ClassWizard will add and remove member functions here.
UP$>,05z6 // DO NOT EDIT what you see in these blocks of generated code !
dP+wcl4 //}}AFX_MSG
,msP(*qoI DECLARE_MESSAGE_MAP()
sW'_K.z };
>j3':>\U LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
(QL:7 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
'S9o!hb'@ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
h# KSKKNW BOOL InitHotkey();
-CuuO=h BOOL UnInit();
~CbiKez #endif
sNcU>qjj6 6i~|<vcSP //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
8>W52~^fU #include "stdafx.h"
\#LDX,= #include "hook.h"
rks"y&&Nc #include <windowsx.h>
2oV6#!{Z #ifdef _DEBUG
r~YBj>} #define new DEBUG_NEW
TukhGgmF #undef THIS_FILE
ej@4jpHQN static char THIS_FILE[] = __FILE__;
TWGn:mi #endif
`4snTM!v& #define MAX_KEY 100
xw_klHL-o #define CTRLBIT 0x04
]u!s-=3s #define ALTBIT 0x02
HcJ!( #define SHIFTBIT 0x01
R]e&JoY #pragma data_seg("shareddata")
bGL} nPo HHOOK hHook =NULL;
|;xEKnF UINT nHookCount =0;
A{J?I: static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
/<n7iIK) static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
O/FI>RT\H static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
"yh2+97l static int KeyCount =0;
LKp;sV static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
u"V,/1++\ #pragma data_seg()
W_E^+Wl@ HINSTANCE hins;
e)B1)c 8s void VerifyWindow();
gC(S(osF BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
=pi,]m //{{AFX_MSG_MAP(CHookApp)
p+|8(w9A${ // NOTE - the ClassWizard will add and remove mapping macros here.
&g&,~Y/z; // DO NOT EDIT what you see in these blocks of generated code!
;`LG WT-<F //}}AFX_MSG_MAP
NQ;X|$!zH END_MESSAGE_MAP()
}|2A6^FH. 3IQI={:k|D CHookApp::CHookApp()
K$,<<hl {
ym%` l! // TODO: add construction code here,
8..|-<w // Place all significant initialization in InitInstance
%q3`k#?< }
Z8FgxR Vm\zLWNB CHookApp theApp;
"5<! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
xok
T {
$;G<!]& s BOOL bProcessed=FALSE;
lSaX!${R'T if(HC_ACTION==nCode)
SO *oBA' {
B
E8_.> if((lParam&0xc0000000)==0xc0000000){// Key up
,(Zxd4?y switch(wParam)
[pEb`s {
n@ba>m4{ case VK_MENU:
,M?8s2? MaskBits&=~ALTBIT;
M^Z=~512g break;
IMbF]6%p( case VK_CONTROL:
/"st
sF MaskBits&=~CTRLBIT;
!ITM:% break;
sV2D:%\K: case VK_SHIFT:
!9NF@e'&! MaskBits&=~SHIFTBIT;
L-E?1qhP> break;
y[.lfW?) default: //judge the key and send message
WHBGhU break;
/iM1 }
|3E|VGm~ for(int index=0;index<MAX_KEY;index++){
X$\CC18 if(hCallWnd[index]==NULL)
%La7);SeY continue;
ZT*}KJm if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
y
`FZ 0FI {
H
$Az,-P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
\^9n&MonM bProcessed=TRUE;
_;5zA"~c#@ }
>Tl/3{V }
u;H^4}
OQ }
nTo?~=b else if((lParam&0xc000ffff)==1){ //Key down
'@+q_v@Jl switch(wParam)
^_\m@ {
,.(:b82$ case VK_MENU:
h_P[B MaskBits|=ALTBIT;
tlD^"eq4: break;
Kgi`@` case VK_CONTROL:
am3.Dt2\ MaskBits|=CTRLBIT;
iOhX\@& break;
24 [cU case VK_SHIFT:
|pBFmm* MaskBits|=SHIFTBIT;
SC%HHu\l break;
>f Hu default: //judge the key and send message
PPV T2;9 break;
9#1?Pt^{< }
Zy9IRZe4U for(int index=0;index<MAX_KEY;index++)
z.RM85 ?T {
q1L>nvE if(hCallWnd[index]==NULL)
( z)#}TC continue;
hNYO+LrI) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
5655)u.N8 {
OhN2FkxL SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
.p=J_%K}0x bProcessed=TRUE;
>r(`4M: }
g.!k>_g` }
0Cf'\2
}
^Tj{}<yT if(!bProcessed){
O86p]Lr for(int index=0;index<MAX_KEY;index++){
t+F_/_"B if(hCallWnd[index]==NULL)
6
F 39' continue;
WQN`y>1#@_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
o-&0_Zq_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
p>J@"?%^ }
PWp=}f.y }
R#y"SxD() }
wBw(T1VN return CallNextHookEx( hHook, nCode, wParam, lParam );
m*B4a9f }
Z*b l J5YC guf&V}& BOOL InitHotkey()
t OJyj49^a {
= vF! if(hHook!=NULL){
hg<[@Q%$o nHookCount++;
/%jX=S.5h< return TRUE;
F/LMk8RgR }
-~JYfj@ else
- e0[$v hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
b?,%M^9\` if(hHook!=NULL)
OJA_OqVp$K nHookCount++;
"Vl4=W)u return (hHook!=NULL);
aY.cx1" }
Q1yXdw BOOL UnInit()
r: >RH, {
Qa:[iF if(nHookCount>1){
-w"lW7 nHookCount--;
-(lP8Y~gFY return TRUE;
>)diXe}j }
iWA?FBv BOOL unhooked = UnhookWindowsHookEx(hHook);
=w`uZ;l$Q if(unhooked==TRUE){
)/Eu=+d nHookCount=0;
Svo\+S hHook=NULL;
uF}B:53A }
XHJ`C\xR return unhooked;
@VG@|BQWa }
b]xoXC6@ t YXqYIG.G BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
1/;E8{ {
1$C?+H BOOL bAdded=FALSE;
3 4%B0 for(int index=0;index<MAX_KEY;index++){
9MI9$s2y if(hCallWnd[index]==0){
CDuA2e hCallWnd[index]=hWnd;
:Ru8Nm HotKey[index]=cKey;
s>\^dtG7 HotKeyMask[index]=cMask;
EVaHb; bAdded=TRUE;
C'gv#!Q KeyCount++;
+|X`cmnuU break;
3pW4Ul@e }
E 11C@% }
&&LB0vH!J return bAdded;
i_r708ep6 }
5cU:wc {5c?_U BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-gt?5H h {
5|pF*8* BOOL bRemoved=FALSE;
^=5y; for(int index=0;index<MAX_KEY;index++){
c[ 0`8s! if(hCallWnd[index]==hWnd){
xHaz*w1| if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
X2%(=B hCallWnd[index]=NULL;
%t!S 7UD HotKey[index]=0;
Lr8|S HotKeyMask[index]=0;
-oUNK}> bRemoved=TRUE;
O_.!qk1R KeyCount--;
MVvBd3 break;
aTeW#:m }
$Q'z9ghEg }
+0Q +0: }
vbtZ5Gm return bRemoved;
gg%)#0Zi }
#<eD q%$p56\?3 void VerifyWindow()
=GF=_Ac {
{}Is&^3Z for(int i=0;i<MAX_KEY;i++){
@sg.0GR if(hCallWnd
!=NULL){ }Kp<w,
if(!IsWindow(hCallWnd)){ C3f\E: D)
hCallWnd=NULL; "gm5DE
HotKey=0; Ng
W"w h
HotKeyMask=0; !yrh50tD
KeyCount--; u|AMqS
} wik<#ke
} 5n}<V-yJ*m
} vo*oCfm
} H7;,Kr
x`@`y7(
BOOL CHookApp::InitInstance() $HQ4 o\~
{ L)F4)VL
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Udn Rsp9S
hins=AfxGetInstanceHandle(); G'-#99wv.
InitHotkey(); ~XuV:K3
return CWinApp::InitInstance(); `<>QKpAn
} *xsBFCRU
L;j++^p
int CHookApp::ExitInstance() ZBY2,%nAo
{ YMK ![ q-
VerifyWindow(); FE,mUpHIR
UnInit(); (Y7zaAG]
return CWinApp::ExitInstance(); {CBb^BP
} sHk>ek]2I
m=^]93+
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file pl1CPxSdO
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 0^o/cSF
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ zN[&
iKf
#if _MSC_VER > 1000 _\tv ${
#pragma once ;xzaW4(3
#endif // _MSC_VER > 1000 JVy|SA&R
JOt(r}gU
class CCaptureDlg : public CDialog Q#H"Se
{ 7G-?^
// Construction +8N6tw/&
public: |H_WY#
BOOL bTray; 3lpxh_
BOOL bRegistered; x@rQ7K>
BOOL RegisterHotkey(); ztSQrDbbb4
UCHAR cKey; Po@;PR=
UCHAR cMask; ~YCH5,
void DeleteIcon(); +c<iVc|
void AddIcon(); *1`X}
UINT nCount; Z)E)-2U$@
void SaveBmp(); ~d]v{<3
CCaptureDlg(CWnd* pParent = NULL); // standard constructor a!: N
C
// Dialog Data LiT%d
//{{AFX_DATA(CCaptureDlg) fy"}#
2
enum { IDD = IDD_CAPTURE_DIALOG }; 3_XLx{["'
CComboBox m_Key; ;n(f?RO3X
BOOL m_bControl; qovsM M
BOOL m_bAlt; A3_p*n@
BOOL m_bShift; eP>_CrJb
CString m_Path; 1;=L]
L?
CString m_Number; ; o_0~l=-/
//}}AFX_DATA Ei @
// ClassWizard generated virtual function overrides o(jLirnk
//{{AFX_VIRTUAL(CCaptureDlg) xWzybuLp
public: @y;VV*
virtual BOOL PreTranslateMessage(MSG* pMsg); gUx}vE-
protected: a#r{FoU{M8
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q+
V<&
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); raPOF6-_rH
//}}AFX_VIRTUAL 4DCh+|r
// Implementation gp`@dn';
protected: ftPps-
HICON m_hIcon; }UW*[dCf>C
// Generated message map functions mv8H:T
//{{AFX_MSG(CCaptureDlg) ,R`CAf%*
virtual BOOL OnInitDialog(); Ie^Ed`
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (X"5x]7]
afx_msg void OnPaint(); 6J,h}S
afx_msg HCURSOR OnQueryDragIcon(); LQPQ !):;
virtual void OnCancel(); )Ac,F6w
afx_msg void OnAbout(); -@w,tbc$
afx_msg void OnBrowse(); ~+4lmslR
afx_msg void OnChange(); GE!nf6>Km
//}}AFX_MSG :;eOhZ=_
DECLARE_MESSAGE_MAP() EZB0qZIp
}; X.4WVI
#endif X^eyrqv
~q566k!Ll!
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file G^)]FwTs
#include "stdafx.h" @9 S ::
#include "Capture.h" #0<pRDXj
#include "CaptureDlg.h" ZSQiQ2\)
#include <windowsx.h> &EV%g6
#pragma comment(lib,"hook.lib") !ZUUn*e{5
#ifdef _DEBUG cwzkA,e@
#define new DEBUG_NEW D|ze0A@
#undef THIS_FILE u/j\pDl.
static char THIS_FILE[] = __FILE__; U!|)M
#endif *bFWNJ}`q
#define IDM_SHELL WM_USER+1 0<`qz |_h
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :.g/=Q(T~
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L D[\eJ_
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ?fy37m(M}
class CAboutDlg : public CDialog A_@..hX(
{ i_*yS+Z;
public: =_k
CAboutDlg(); 3 twA5)v
// Dialog Data 4utwcXL
//{{AFX_DATA(CAboutDlg) jq)Bj#'7
enum { IDD = IDD_ABOUTBOX }; _@B?
//}}AFX_DATA Xf&YcHo
// ClassWizard generated virtual function overrides xW)
//{{AFX_VIRTUAL(CAboutDlg) ^oPFLez56
protected: i.6 b%
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M%ecWr!tj
//}}AFX_VIRTUAL FA,n>
// Implementation QYo04`Rl
protected: e:
Sd#H!
//{{AFX_MSG(CAboutDlg) y$7Ys:R~
//}}AFX_MSG B`eK_'7t
DECLARE_MESSAGE_MAP() kNWTM%u9
}; ?X|q
M4)U
[v
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +&u/R')?6r
{ ddN(L`nd
//{{AFX_DATA_INIT(CAboutDlg) ?QffSSj[s
//}}AFX_DATA_INIT }@6Ze$>
} !~C%0{9+u@
YNV,
dKB
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >+7{PF+sB
{ =!SV;^-q
CDialog::DoDataExchange(pDX); ,TWlg
//{{AFX_DATA_MAP(CAboutDlg) B\R X
//}}AFX_DATA_MAP Vc5>I_
} ')q4d0B`"
[r"Oi|
8I
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rGNa[1{kRs
//{{AFX_MSG_MAP(CAboutDlg) H'#06zP>5
// No message handlers AmIW$(Ce
//}}AFX_MSG_MAP 4#>Z.sf
END_MESSAGE_MAP()
k a!w\v
Z#@
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1LS1 ZY
: CDialog(CCaptureDlg::IDD, pParent) oQ-m
{ b%MZfaU
//{{AFX_DATA_INIT(CCaptureDlg) %2dzx[s
m_bControl = FALSE; Qqg.z-G%.
m_bAlt = FALSE; giu{,gS0?M
m_bShift = FALSE; 'A5T$JV.r4
m_Path = _T("c:\\"); %C`P7&8m=O
m_Number = _T("0 picture captured."); &G_#=t&
nCount=0; Az y`4
bRegistered=FALSE; [c=P)t7
V
bTray=FALSE;
Z:^#9D{
//}}AFX_DATA_INIT &o x
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 gk| %
4.
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); rP]|`*B
} rkji#\_-FV
3m75mny
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) D)x^?!
{ N9|J\;fzT
CDialog::DoDataExchange(pDX); ;MNUT,U
//{{AFX_DATA_MAP(CCaptureDlg) #pPOQv:~
DDX_Control(pDX, IDC_KEY, m_Key); .n8O 3V
DDX_Check(pDX, IDC_CONTROL, m_bControl); wi+Qlf
DDX_Check(pDX, IDC_ALT, m_bAlt); U9T}iI
DDX_Check(pDX, IDC_SHIFT, m_bShift); !0hyp |F:>
DDX_Text(pDX, IDC_PATH, m_Path); U -OD
DDX_Text(pDX, IDC_NUMBER, m_Number); &,<,!j)Jr
//}}AFX_DATA_MAP A^M]vk%dg
} 7+f6?
R.WB.FP
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 40MKf/9
//{{AFX_MSG_MAP(CCaptureDlg) aHu0z:
ON_WM_SYSCOMMAND() %dnpO|L
ON_WM_PAINT() w;}5B~).
ON_WM_QUERYDRAGICON() :k?`gm$
ON_BN_CLICKED(ID_ABOUT, OnAbout) \(
V1-,
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) D+;4|7s+
ON_BN_CLICKED(ID_CHANGE, OnChange) OKm,iIp]
//}}AFX_MSG_MAP 8D`+3
END_MESSAGE_MAP() l (rm0_
:Ef!gpS}?R
BOOL CCaptureDlg::OnInitDialog() oQh;lb
{ {sB-"NR`K
CDialog::OnInitDialog(); 7#+Ih-&EQ
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); *LhwIY
ASSERT(IDM_ABOUTBOX < 0xF000); Tv7W)?3h
CMenu* pSysMenu = GetSystemMenu(FALSE); USEmD5 q
if (pSysMenu != NULL) `^{G`es
{ SaGI4O_\s
CString strAboutMenu; <2@t~9
strAboutMenu.LoadString(IDS_ABOUTBOX); A@|Z^T:
if (!strAboutMenu.IsEmpty()) *A!M0TK?i,
{ 9\?&u_ U"
pSysMenu->AppendMenu(MF_SEPARATOR); :_i1gY)
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >F^$
' b]
} V^FM-bg%9
} KL?<lp"
SetIcon(m_hIcon, TRUE); // Set big icon bE%
Hm!
SetIcon(m_hIcon, FALSE); // Set small icon /Z*$k{qIR&
m_Key.SetCurSel(0); ;p*L(8<YI
RegisterHotkey(); 6[XaIco=C
CMenu* pMenu=GetSystemMenu(FALSE); qU6!vgM&
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +7OE,RoQ
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4d@0v n{
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); l2W+VBn6
return TRUE; // return TRUE unless you set the focus to a control 2&'uO'K
} *{5}m(5F
+1qvT_
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) o"RE4s\G~r
{ EhO\N\p(Q=
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Us "G X_
{ kKbbsB
CAboutDlg dlgAbout; |1ry*~
dlgAbout.DoModal(); 9VaSCB
} lbIW1z%:sy
else NY?iuWa*g
{ r{yIF~k@
CDialog::OnSysCommand(nID, lParam); ~qb?#IY]`
} 0j;|IU\
} W{ozZuo
ArX*3
void CCaptureDlg::OnPaint() .ZQXY%g
{ Rbm+V{EF&
if (IsIconic()) b,HXD~=
{
KYcc jX
CPaintDC dc(this); // device context for painting c?xeBC1-
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !Y^$rF-+
// Center icon in client rectangle `,GFiTPd
int cxIcon = GetSystemMetrics(SM_CXICON); cv_O2Q4,@
int cyIcon = GetSystemMetrics(SM_CYICON); >)+U^V
CRect rect; V /OW=WCzN
GetClientRect(&rect); c$A}mL_
int x = (rect.Width() - cxIcon + 1) / 2; /KvpJ4
int y = (rect.Height() - cyIcon + 1) / 2; \hzx?
// Draw the icon
&@7|_60
dc.DrawIcon(x, y, m_hIcon); `~=Is.V[
} ?K}KSJ6_
else 71&`6#
{ ; zy;M5l5.
CDialog::OnPaint(); *OE>gg&?Nh
} Q%GLT,f1.
} y7*^H
g]}]/\
HCURSOR CCaptureDlg::OnQueryDragIcon() A@k=Mk
{ tK <)A)
return (HCURSOR) m_hIcon; N)z]
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} /_bM~g
VKrKA71Z~
void CCaptureDlg::OnCancel() oWOH #w
{ .Qj`_q6=
if(bTray) ,%m$_wA$
DeleteIcon(); QaEXk5>e
CDialog::OnCancel(); CV7.hF<
} zjJyc?
-3b0;L&4>x
void CCaptureDlg::OnAbout() b}G +7B
{ Nb{oH +$b
CAboutDlg dlg; 8|Y^z_C
dlg.DoModal(); @49^WY
} +~/zCJ;F
anV)$PT=
void CCaptureDlg::OnBrowse() DwTZ<H4
{ D{z=)'/F
CString str; z?YGE iR/}
BROWSEINFO bi; wy&*6>.
char name[MAX_PATH]; If#7SF)n'
ZeroMemory(&bi,sizeof(BROWSEINFO)); ,>jm|BTD {
bi.hwndOwner=GetSafeHwnd(); >\p}UPx
bi.pszDisplayName=name; =XS'V*
bi.lpszTitle="Select folder"; rC*n Z*
bi.ulFlags=BIF_RETURNONLYFSDIRS; *AN#D?X_
LPITEMIDLIST idl=SHBrowseForFolder(&bi); >)
:d38M
if(idl==NULL) D 7E^;W)H
return; JT-Zo OZ
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); p]g/iLDZ
str.ReleaseBuffer(); BzUx@,
m_Path=str; =gqZ^v&5U
if(str.GetAt(str.GetLength()-1)!='\\') *:_hOOT+[
m_Path+="\\"; (6+0U1[Iz
UpdateData(FALSE); nBj7 Q!lW
} Bms?`7}N
J\0YL\jw1K
void CCaptureDlg::SaveBmp() MdfkC6P
{ 3G&1. 8
CDC dc; eK@Y] !lz
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ixkg,
CBitmap bm; ZqGq%8\.s
int Width=GetSystemMetrics(SM_CXSCREEN); w/<hyEpxg
int Height=GetSystemMetrics(SM_CYSCREEN); jHZ<Gc
bm.CreateCompatibleBitmap(&dc,Width,Height); ={oO9.9
CDC tdc; &pAT
tdc.CreateCompatibleDC(&dc); ;g*6NzdA
CBitmap*pOld=tdc.SelectObject(&bm); g<-cHF
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \#}%E h
b
tdc.SelectObject(pOld); -|kDa1knA
BITMAP btm; q.t5L=l^
r
bm.GetBitmap(&btm); / u{r5`4
DWORD size=btm.bmWidthBytes*btm.bmHeight; %"6IAt
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); dd+).*
BITMAPINFOHEADER bih; 5%$#3LT|
bih.biBitCount=btm.bmBitsPixel; '37b[~k4
bih.biClrImportant=0; 1,J.
bih.biClrUsed=0; A!~o?ej
bih.biCompression=0; 2S4z$(x3
bih.biHeight=btm.bmHeight; \4[Ta,;t
bih.biPlanes=1; {1+H\(v
bih.biSize=sizeof(BITMAPINFOHEADER); GXl?Zg
bih.biSizeImage=size; Y4O L 82Y
bih.biWidth=btm.bmWidth; wMoAvA_oS
bih.biXPelsPerMeter=0; yN.D(ZwF:
bih.biYPelsPerMeter=0; [8w2U%}]
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); kes'q8k
static int filecount=0; Ah`dt8t
CString name; v(O.GhJ@
name.Format("pict%04d.bmp",filecount++); a6d KQ3D
name=m_Path+name; luT8>9X^:a
BITMAPFILEHEADER bfh; gib]#n1!p
bfh.bfReserved1=bfh.bfReserved2=0; S8VR#
bfh.bfType=((WORD)('M'<< 8)|'B'); O~el2
bfh.bfSize=54+size; De_</1Au!2
bfh.bfOffBits=54; 3@L%#]xwi
CFile bf; cw.7YiU
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $EIkk= z
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [
UJj*n
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); =*Xf(mh c
bf.WriteHuge(lpData,size); >``GDjcJ
bf.Close(); z<>_*Lfj
nCount++; :N}KScS|Wa
} ~tvoR&{I
GlobalFreePtr(lpData); YC<I|&"
if(nCount==1) k Dt)S$N4n
m_Number.Format("%d picture captured.",nCount); {@AcL:Eit
else k;5}@3iQ
m_Number.Format("%d pictures captured.",nCount); ,m,vo_Ub
UpdateData(FALSE); 8A .7=C' z
} -;$/<
p%1m&/`F
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) (K6StNtN
{ bf/loMtD
if(pMsg -> message == WM_KEYDOWN) ,v_r$kh^
{ QO k"UP
if(pMsg -> wParam == VK_ESCAPE) ^;Q
pE
return TRUE; c&-$?f
r
if(pMsg -> wParam == VK_RETURN) j:3Hm0W3
return TRUE; dy?|Q33Y"
} GTl (i*
return CDialog::PreTranslateMessage(pMsg); @98SC}}u
} UE w3AO
+Uq:sfj,
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {PtTPz
{ lG>e6[Wc
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %0]b5u
SaveBmp(); !p2,|6Y`y
return FALSE; ,D,f9
} Tk&9Klo
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ }#5roNH~Z
CMenu pop; AiK4t-
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); d ovwB`5
CMenu*pMenu=pop.GetSubMenu(0); $ywh%OEH
pMenu->SetDefaultItem(ID_EXITICON); }A/&]1GWk
CPoint pt; y7EX&
GetCursorPos(&pt); 9R"N#w.U]
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); e7qMt[.
if(id==ID_EXITICON) {eN{Zh5"
DeleteIcon(); %&+R":Bw
else if(id==ID_EXIT) Prz+kPP
OnCancel(); 4Olv8nOe<
return FALSE; l'".}6S
} fUKdC\WL
LRESULT res= CDialog::WindowProc(message, wParam, lParam); aDvO(C
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7C7(bg,7^
AddIcon(); dQ`ZrWd_U
return res; ^1yTL5#:Vw
} #s
R0*
u m2s^G
void CCaptureDlg::AddIcon() !2U7gVt"*
{ &\lS
NOTIFYICONDATA data; ^O Xr: P
data.cbSize=sizeof(NOTIFYICONDATA); ~K$"PKs3
CString tip; _6S
b.9m
tip.LoadString(IDS_ICONTIP); EJ;0ypbG
data.hIcon=GetIcon(0); /Q>{YsRRB
data.hWnd=GetSafeHwnd(); UEQ'D9
strcpy(data.szTip,tip); 2G}7R5``9
data.uCallbackMessage=IDM_SHELL; \R>5F\ 0
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; m#'rI=}!
data.uID=98; 2T(,H.O
Shell_NotifyIcon(NIM_ADD,&data); -1r &s
ShowWindow(SW_HIDE); 9eN2)a/
bTray=TRUE; Q @OC =
} K9O,7h:x
7}tZ?vD
void CCaptureDlg::DeleteIcon() L8w76|
{ :n>ccZeMv
NOTIFYICONDATA data; :UDn^(#
data.cbSize=sizeof(NOTIFYICONDATA); s3_e7D ^H
data.hWnd=GetSafeHwnd(); 'UvS3]bSYW
data.uID=98; +x9"#0|k;
Shell_NotifyIcon(NIM_DELETE,&data); Fx[A8G
ShowWindow(SW_SHOW); Z(k\J|&9C
SetForegroundWindow(); @U
/3iDB\
ShowWindow(SW_SHOWNORMAL); q4.dLU,1
bTray=FALSE; )Rhf f$
} K)Xs L
.xLF}{u
void CCaptureDlg::OnChange() nc\C4g
{ BvZ^^IUb
RegisterHotkey(); ~
S?-{X+
} _+Jf.n20
DNW2;i<hsz
BOOL CCaptureDlg::RegisterHotkey() {r].SrW9s9
{ fr'huvc
UpdateData(); V^`?8P8d
UCHAR mask=0; %7(kP}y*
UCHAR key=0; Bd[L6J)
if(m_bControl) /\-2l+y>J
mask|=4; H7yg9zFT
N
if(m_bAlt) N7~)qqb
mask|=2; /J[H5uA
if(m_bShift) mP)3cc5T
mask|=1; vlPl(F1
key=Key_Table[m_Key.GetCurSel()]; U7]<U-.&
if(bRegistered){ pVV}1RDa
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5U)ab3:
bRegistered=FALSE; dDqr
B-G
} >St.c
cMask=mask; { p!_-sL
cKey=key; L8bI0a]r"*
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); TDAWI_83-
return bRegistered; Y(hW(bd;
} @ kJ0K
wUK7um
四、小结 " xDx/d8B
@q> ktE_
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。