編譯時出錯：從'void *'無效轉換爲'無符號字符*'

Question

編程一個Arduino兆2560. 我買了一個TFT液晶顯示器，爲此我想用SD卡，這樣我就可以把我的照片在上面。

我下載了這個庫，但它給了我錯誤。

 
C:\Arduino\libraries\pff\pff.cpp: In function 'FRESULT pf_read(void*, short unsigned int, short unsigned int*)': 
C:\Arduino\libraries\pff\pff.cpp:585: error: invalid conversion from 'void*' to 'unsigned char*' 

的問題是海事組織在這裏：

pff.cpp：

FRESULT pf_read (
    void* buff,  /* Pointer to the read buffer (NULL:Forward data to the stream)*/ 
    WORD btr,  /* Number of bytes to read */ 
    WORD* br  /* Pointer to number of bytes read */ 
) 

pff.h：

FRESULT pf_read (void*, WORD, WORD*);   /* Read data from the open file */ 

當我使它成爲一個.c文件，它給我更多的錯誤，像這樣：

 
tft_menu.cpp.o: In function `open_root_dir()': 
C:\AppData\Local\Temp\build7310099894910129341.tmp/tft_menu.cpp:594: undefined reference to `pf_opendir(_DIR_*, char const*)' 
tft_menu.cpp.o: In function `mount_sd()': 
C:\AppData\Local\Temp\build7310099894910129341.tmp/tft_menu.cpp:583: undefined reference to `disk_initialize()' 
C:\AppData\Local\Temp\build7310099894910129341.tmp/tft_menu.cpp:585: undefined reference to `pf_mount(_FATFS_*)' 
tft_menu.cpp.o: In function `bitmap_show(char*)': 
C:\AppData\Local\Temp\build7310099894910129341.tmp/tft_menu.cpp:472: undefined reference to `pf_open(char const*)' 
C:\AppData\Local\Temp\build7310099894910129341.tmp/tft_menu.cpp:476: undefined reference to `pf_read(void*, unsigned short, unsigned short*)' 
C:\AppData\Local\Temp\build7310099894910129341.tmp/tft_menu.cpp:518: undefined reference to `pf_read(void*, unsigned short, unsigned short*)' 
tft_menu.cpp.o: In function `show_bitmap()': 
C:\AppData\Local\Temp\build7310099894910129341.tmp/tft_menu.cpp:603: undefined reference to `pf_readdir(_DIR_*, _FILINFO_*)' 

所以我認爲它應該被編譯爲cpp。

編輯：

我發現我必須拯救被作爲CPP並在程序中我寫什麼icktoofay指出

後，我得到了一些錯誤，所以我去了線585 ，如上所述並且改變了

BYTE * rbuff = buff;

成

BYTE rbuff =（無符號字符）淺黃色;

我發現我不得不添加mcc.h來擺脫「找不到資源」的錯誤。

而現在即時得到這些錯誤：

C:\libraries\mmc/mmc.h: In function 'void init_spi()': 
C:\libraries\mmc/mmc.h:21: error: 'PORTL' was not declared in this scope 
C:\libraries\mmc/mmc.h:21: error: 'PORTL0' was not declared in this scope 
C:\libraries\mmc/mmc.h:22: error: 'PORTB' was not declared in this scope 
C:\libraries\mmc/mmc.h:22: error: 'PORTB2' was not declared in this scope 
C:\libraries\mmc/mmc.h:22: error: 'PORTB1' was not declared in this scope 
C:\libraries\mmc/mmc.h:23: error: 'DDRB' was not declared in this scope 
C:\libraries\mmc/mmc.h:23: error: 'PORTB0' was not declared in this scope 
C:\libraries\mmc/mmc.h:25: error: 'DDRL' was not declared in this scope 
C:\libraries\mmc/mmc.h:27: error: 'SPCR' was not declared in this scope 
C:\libraries\mmc/mmc.h:27: error: 'SPE' was not declared in this scope 
C:\libraries\mmc/mmc.h:27: error: 'MSTR' was not declared in this scope 
C:\libraries\mmc/mmc.h:28: error: 'SPSR' was not declared in this scope 
C:\libraries\mmc/mmc.h:28: error: 'SPI2X' was not declared in this scope 

香港專業教育學院試圖在mcc.h的頂部，仍然沒有運氣添加＃TFT_ARDUINO_MEGA.h

Answer 1

編譯它作爲一個C文件，但在使用它的文件，包括pff.h這樣的：

extern "C" { 
#include <pff.h> 
}