SendMessage的返回值问题！(100分)

G

gdxkz

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• 2001-09-22

• #1

char *name = SendMessage(hwnd_winamp, WM_USER, index, IPC_GETPLAYLISTFILE);<br>上面是C中的返回值，但Delphi的SendMessage好象所有的消息返回都是integer型，难道就不能返回其他的类型了，或者需要自己声明window原来的SendMessage?

 

卷

卷起千堆雪tyn

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• 2001-09-22

• #2

返回值不一定必须是整型啊！<br>你可以自己依据发送的消息进行定义的！<br><br>&nbsp; The return value specifies the result of the message processing and <br>depends on the message sent.

 

G

gdxkz

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• 2001-09-22

• #3

你在Delphi中打入SendMessage发送WM_USER消息让DELPHI进行参数提示看看，提示的返回值是INTEGER，我用的是DELPHI6

 

一

一个过客

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• 2001-09-22

• #4

char * =&gt;指针 =&gt;整数<br><br>是一回事！

 

G

gdxkz

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• 2001-09-23

• #5

我试过使用很多种方法都不能还原name这个字串，该怎么做才能还原SendMessage返回的字符串？

 

K

Kingron

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• 2001-09-23

• #6

pchar()就可以了。

 

G

gdxkz

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• 2001-09-23

• #7

下面是在WINAMP主页上的TIP，我还是无法得到正确的结果。<br>How do I get the filename (not title) of the current song?<br>First you must get the current track index from the playlist. Then you can get the filename. <br><br>#define IPC_GETLISTPOS 125<br>#define IPC_GETPLAYLISTFILE 211<br>int index = SendMessage(hwnd_winamp, WM_USER, 0, IPC_GETLISTPOS);<br>char *name = SendMessage(hwnd_winamp, WM_USER, index, IPC_GETPLAYLISTFILE);<br><br>

 

K

Kingron

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• 2001-09-23

• #8

奇怪，可以得到Index，没有办法得到Song Title？

 

G

gdxkz

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• 2001-09-23

• #9

就是!下面的例子在delphi里也不行。<br>Here is some sample code to add a song to the playlist. <br>#define &nbsp;IPC_PLAYFILE 100;<br>COPYDATASTRUCT cds;<br>cds.dwData = IPC_PLAYFILE;<br>cds.cbData = lstrlen(filename) + 1;<br>cds.lpData = (void *) filename;<br>SendMessage(hwnd_winamp, WM_COPYDATA, (WPARAM)NULL, (LPARAM)&amp;cds);<br><br>我转成delphi后也不行，总感觉DELPHI的SendMessage和其他语言的不一样！<br>var<br>&nbsp;cds:COPYDATASTRUCT;<br>&nbsp;fchar;<br>begin<br>cds.dwData:=100;<br>cds.cbData:= length(filename) + 1;<br>cds.lpData:= lstrcpy(f,pchar(filename));<br>SendMessage(hwndWinamp, WM_COPYDATA, 0, cds);<br>end;

 

猛

猛禽

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• 2001-09-23

• #10

var<br>&nbsp;cds:COPYDATASTRUCT;<br>&nbsp;fchar;<br>begin<br>cds.dwData:=100;<br>cds.cbData:= length(filename) + 1;<br>cds.lpData:= pchar(filename); &nbsp;// &nbsp;这样就可以了，你那样反而错<br>SendMessage(hwndWinamp, WM_COPYDATA, 0, cds);<br>end;